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Welton T, Chew G, Mai AS, Ng JH, Chan LL, Tan EK. Association of Gene Expression and Tremor Network Structure. Mov Disord 2024. [PMID: 38769620 DOI: 10.1002/mds.29831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 04/18/2024] [Accepted: 04/24/2024] [Indexed: 05/22/2024] Open
Abstract
BACKGROUND Transcriptomic changes in the essential tremor (ET)-associated cerebello-thalamo-cortical "tremor network" and their association to brain structure have not been investigated. OBJECTIVE The aim was to characterize molecular changes associated with network-level imaging-derived phenotypes (IDP) found in ET. METHODS We performed an imaging-transcriptomic study in British adults using imaging-genome-wide association study summary statistics (UK Biobank "BIG40" cohort; n = 33,224, aged 40-69 years). We imputed imaging-transcriptomic associations for 184 IDPs and analyzed functional enrichment of gene modules and aggregate network-level phenotypes. Validation was performed in cerebellar-tissue RNA-sequencing data from ET patients and controls (n = 55). RESULTS Among 237,896 individual predicted gene expression levels for 6063 unique genes/transcripts, we detected 2269 genome-wide significant associations (Bonferroni P < 2.102e-7, 0.95%). These were concentrated in intracellular volume fraction measures of white matter pathways and in genes with putative links to tremor (MAPT, ARL17A, KANSL1, SPPL2C, LRRC37A4P, PLEKHM1, and FMNL1). Whole-tremor-network cortical thickness was associated with a gene module linked to mitochondrial organization and protein quality control (r = 0.91, P = 2e-70), whereas white-gray T1-weighted magnetic resonance imaging (MRI) contrast in the tremor network was associated with a gene module linked to sphingolipid synthesis and ethanolamine metabolism (r = -0.90, P = 2e-68). Imputed association effect sizes and RNA-sequencing log-fold change in the validation dataset were significantly correlated for cerebellar peduncular diffusion MRI phenotypes, and there was a close overlap of significant associations between both datasets for gray matter phenotypes (χ2 = 6.40, P = 0.006). CONCLUSIONS The identified genes and processes are potential treatment targets for ET, and our results help characterize molecular changes that could in future be used for patient treatment selection or prognosis prediction. © 2024 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Thomas Welton
- Department of Research, National Neuroscience Institute, Singapore, Singapore
- Neuroscience and Behavioural Disorders, Duke-NUS Medical School, Singapore, Singapore
| | - Gabriel Chew
- Neuroscience and Behavioural Disorders, Duke-NUS Medical School, Singapore, Singapore
| | - Aaron Shengting Mai
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Jing Han Ng
- Department of Neurology, Singapore General Hospital, Singapore, Singapore
| | - Ling Ling Chan
- Department of Research, National Neuroscience Institute, Singapore, Singapore
- Neuroscience and Behavioural Disorders, Duke-NUS Medical School, Singapore, Singapore
- Department of Diagnostic Radiology, Singapore General Hospital, Singapore, Singapore
| | - Eng-King Tan
- Department of Research, National Neuroscience Institute, Singapore, Singapore
- Neuroscience and Behavioural Disorders, Duke-NUS Medical School, Singapore, Singapore
- Department of Neurology, Singapore General Hospital, Singapore, Singapore
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Orsucci D, Tessa A, Caldarazzo Ienco E, Trovato R, Natale G, Bilancieri G, Giuntini M, Napolitano A, Salvetti S, Vista M, Santorelli FM. Clinical and genetic features of dominant Essential Tremor in Tuscany, Italy: FUS, CAMTA1, ATXN1 and beyond. J Neurol Sci 2024; 460:123012. [PMID: 38626532 DOI: 10.1016/j.jns.2024.123012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Revised: 04/07/2024] [Accepted: 04/09/2024] [Indexed: 04/18/2024]
Abstract
OBJECTIVE Essential Tremor (ET) is one of the most common neurological disorders. In most instances ET is inherited as an autosomal dominant trait with age-related penetrance (virtually complete in advanced age); however, ET genetics remains elusive. The current study aims to identify possibly pathogenic genetic variants in a group of well-characterized ET families. METHODS 34 individuals from 14 families with dominant ET were clinically evaluated and studied by whole exome sequencing studies (after excluding trinucleotide expansion disorders). RESULTS Most patients had pure ET. In 4 families, exome studies could identify a genetic variant potentially able to significantly alter the protein structure (CADD >20, REVEL score > 0.25), shared by all the affected individuals (in CAMTA1, FUS, MYH14, SGCE genes). In another family there were two variants in dominant genes (PCDH9 and SQSTM1). Moreover, an interrupted "intermediate" trinucleotide expansion in ATXN1 ("SCA1") was identified in a further family with pure ET. CONCLUSION Combining our observations together with earlier reports, we can conclude that ET genes confirmed in at least two families to date include CAMTA1 and FUS (reported here), as well as CACNA1G, NOTCH2NLC and TENM4. Most cases of familial ET, inherited with an autosomal dominant inheritance, may result from "mild" variants of many different genes that, when affected by more harmful genetic variants, lead to more severe neurological syndromes (still autosomal dominant). Thus, ET phenotype may be the "mild", incomplete manifestation of many other dominant neurogenetic diseases. These findings further support evidence of genetic heterogeneity for such disease(s). Author's keywords: cerebellar ataxias, movement disorders, neurogenetics, rare neurological disorders, tremor.
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Affiliation(s)
- D Orsucci
- Unit of Neurology, San Luca Hospital, Lucca, Italy.
| | - A Tessa
- IRCCS Stella Maris Foundation, Calambrone, Pisa, Italy
| | | | - R Trovato
- IRCCS Stella Maris Foundation, Calambrone, Pisa, Italy
| | - G Natale
- IRCCS Stella Maris Foundation, Calambrone, Pisa, Italy
| | - G Bilancieri
- IRCCS Stella Maris Foundation, Calambrone, Pisa, Italy
| | - M Giuntini
- Unit of Neurology, San Luca Hospital, Lucca, Italy
| | - A Napolitano
- Unit of Neurology, Apuane Hospital, Massa Carrara, Italy
| | - S Salvetti
- Unit of Neurology, San Luca Hospital, Lucca, Italy
| | - M Vista
- Unit of Neurology, San Luca Hospital, Lucca, Italy
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Zeng S, Zhou X, He R, Zhao Y, Liu Z, Xu Q, Guo J, Yan X, Li J, Tang B, Sun Q. Association Analysis of Essential Tremor-Associated Genetic Variants in Sporadic Late-Onset Parkinson's Disease. Tremor Other Hyperkinet Mov (N Y) 2024; 14:25. [PMID: 38737298 PMCID: PMC11086585 DOI: 10.5334/tohm.885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Accepted: 04/25/2024] [Indexed: 05/14/2024] Open
Abstract
Background Parkinson's disease (PD) and Essential tremor (ET) are the two most common tremor diseases with recognized genetic pathogenesis. The overlapping clinical features suggest they may share genetic predispositions. Our previous study systematically investigated the association between rare coding variants in ET-associated genes and early-onset PD (EOPD), and found the suggestive association between teneurin transmembrane protein 4 (TENM4) and EOPD. In the current research, we explored the potential genetic interplay between ET-associated genetic loci/genes and sporadic late-onset PD (LOPD). Methods We performed whole-genome sequencing in the 1962 sporadic LOPD cases and 1279 controls from mainland China. We first used logistic regression analysis to test the top 16 SNPs identified by the ET genome-wide association study for the association between ET and LOPD. Then we applied the optimized sequence kernel association testing to explore the rare variant burden of 33 ET-associated genes in this cohort. Results We did not observe a significant association between the included SNPs with LOPD. We also did not discover a significant burden of rare deleterious variants of ET-associated genes in association with LOPD risk. Conclusion Our results do not support the role of ET-associated genetic loci and variants in LOPD. Highlights 1962 cases and 1279 controls were recruited to study the potential genetic interplay between ET-associated genetic loci/variants and sporadic LOPD.No significant association between the ET-associated SNPs and LOPD were observed.No significant burden of rare deleterious variants of ET-associated gene in LOPD risk were found.
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Affiliation(s)
- Sheng Zeng
- Department of Geriatrics, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, 410008, China
| | - Xun Zhou
- Department of Geriatric Neurology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Runcheng He
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Yuwen Zhao
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Zhenhua Liu
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, 410008, China
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Qian Xu
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, 410008, China
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Jifeng Guo
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, 410008, China
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Xinxiang Yan
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, 410008, China
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Jinchen Li
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, 410008, China
- Department of Geriatric Neurology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Beisha Tang
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, 410008, China
- Department of Geriatric Neurology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, 410008, China
| | - Qiying Sun
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, 410008, China
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, 410008, China
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Pirmoradi Z, Nakhaie M, Ranjbar H, Kalantar-Neyestanaki D, Kohlmeier KA, Asadi-Shekaari M, Hassanshahi A, Shabani M. Resveratrol and 1,25-dihydroxyvitamin D decrease Lingo-1 levels, and improve behavior in harmaline-induced Essential tremor, suggesting potential therapeutic benefits. Sci Rep 2024; 14:9864. [PMID: 38684734 PMCID: PMC11058818 DOI: 10.1038/s41598-024-60518-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 04/24/2024] [Indexed: 05/02/2024] Open
Abstract
Essential tremor (ET) is a neurological disease that impairs motor and cognitive functioning. A variant of the Lingo-1 genetic locus is associated with a heightened ET risk, and increased expression of cerebellar Lingo-1. Lingo-1 has been associated with neurodegenerative processes; however, neuroprotection from ET-associated degeneration can be conferred by the protein Sirt1. Sirt1 activity can be promoted by Resveratrol (Res) and 1,25-dihydroxyvitamin D3 (VitD3), and thus these factors may exert neuroprotective properties through a Sirt1 mechanism. As Res and VitD3 are linked to Sirt1, enhancing Sirt1 could counteract the negative effects of increased Lingo-1. Therefore, we hypothesized that a combination of Res-VitD3 in a harmaline injection model of ET would modulate Sirt1 and Lingo-1 levels. As expected, harmaline exposure (10 mg/kg/every other day; i.p.) impaired motor coordination, enhanced tremors, rearing, and cognitive dysfunction. When Res (5 mg/kg/day; i.p.) and VitD3 (0.1 mg/kg/day; i.p.) were given to adult rats (n = 8 per group) an hour before harmaline, tremor severity, rearing, and memory impairment were reduced. Individual treatment with Res and VitD3 decreased Lingo-1 gene expression levels in qPCR assays. Co-treatment with Res and VitD3 increased and decreased Sirt1 and Lingo-1 gene expression levels, respectively, and in some cases, beneficial effects on behavior were noted, which were not seen when Res or VitD3 were individually applied. Taken together, our study found that Res and VitD3 improved locomotor and cognitive deficits, modulated Sirt1 and Lingo-1. Therefore, we would recommend co-treatment of VitD3 and Res to leverage complementary effects for the management of ET symptoms.
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Affiliation(s)
- Zeynab Pirmoradi
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, 76198-13159, Iran
| | - Mohsen Nakhaie
- Gastroenterology and Hepatology Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran
| | - Hoda Ranjbar
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, 76198-13159, Iran
| | | | - Kristi A Kohlmeier
- Department of Drug Design and Pharmacology, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Majid Asadi-Shekaari
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, 76198-13159, Iran
| | - Amin Hassanshahi
- Department of Physiology, Medical School, Bam University of Medical Sciences, Bam, Iran
| | - Mohammad Shabani
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, 76198-13159, Iran.
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Skuladottir AT, Stefansdottir L, Halldorsson GH, Stefansson OA, Bjornsdottir A, Jonsson P, Palmadottir V, Thorgeirsson TE, Walters GB, Gisladottir RS, Bjornsdottir G, Jonsdottir GA, Sulem P, Gudbjartsson DF, Knowlton KU, Jones DA, Ottas A, Pedersen OB, Didriksen M, Brunak S, Banasik K, Hansen TF, Erikstrup C, Haavik J, Andreassen OA, Rye D, Igland J, Ostrowski SR, Milani LA, Nadauld LD, Stefansson H, Stefansson K. GWAS meta-analysis reveals key risk loci in essential tremor pathogenesis. Commun Biol 2024; 7:504. [PMID: 38671141 PMCID: PMC11053069 DOI: 10.1038/s42003-024-06207-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 04/17/2024] [Indexed: 04/28/2024] Open
Abstract
Essential tremor (ET) is a prevalent neurological disorder with a largely unknown underlying biology. In this genome-wide association study meta-analysis, comprising 16,480 ET cases and 1,936,173 controls from seven datasets, we identify 12 sequence variants at 11 loci. Evaluating mRNA expression, splicing, plasma protein levels, and coding effects, we highlight seven putative causal genes at these loci, including CA3 and CPLX1. CA3 encodes Carbonic Anhydrase III and carbonic anhydrase inhibitors have been shown to decrease tremors. CPLX1, encoding Complexin-1, regulates neurotransmitter release. Through gene-set enrichment analysis, we identify a significant association with specific cell types, including dopaminergic and GABAergic neurons, as well as biological processes like Rho GTPase signaling. Genetic correlation analyses reveals a positive association between ET and Parkinson's disease, depression, and anxiety-related phenotypes. This research uncovers risk loci, enhancing our knowledge of the complex genetics of this common but poorly understood disorder, and highlights CA3 and CPLX1 as potential therapeutic targets.
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Affiliation(s)
- Astros Th Skuladottir
- deCODE genetics/Amgen Inc., Reykjavik, Iceland.
- Faculty of Medicine, University of Iceland, Reykjavik, Iceland.
| | | | | | | | | | - Palmi Jonsson
- Faculty of Medicine, University of Iceland, Reykjavik, Iceland
- Department of Geriatric Medicine, Landspitali University Hospital, Reykjavik, Iceland
| | - Vala Palmadottir
- Department of Internal Medicine, Landspitali University Hospital, Reykjavik, Iceland
| | | | | | - Rosa S Gisladottir
- deCODE genetics/Amgen Inc., Reykjavik, Iceland
- Faculty of Icelandic and Comparative Cultural Studies, University of Iceland, Reykjavik, Iceland
| | | | | | | | - Daniel F Gudbjartsson
- deCODE genetics/Amgen Inc., Reykjavik, Iceland
- Faculty of Engineering and Natural Sciences, University of Iceland, Reykjavik, Iceland
| | - Kirk U Knowlton
- Intermountain Medical Center, Intermountain Heart Institute, Salt Lake City, USA
| | - David A Jones
- Precision Genomics, Intermountain Healthcare, Saint George, Utah, UK
| | - Aigar Ottas
- Estonian Genome Centre, Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Ole B Pedersen
- Department of Clinical Immunology, Zealand University Hospital, Køge, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Maria Didriksen
- Department of Clinical Immunology, Copenhagen University Hospital, Righospitale, Copenhagen, Denmark
| | - Søren Brunak
- Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Karina Banasik
- Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Folkmann Hansen
- Danish Headache Center, Department of Neurology, Copenhagen University Hospital, Righospitalet-Glostrup, Copenhagen, Denmark
| | - Christian Erikstrup
- Department of Clinical Immunology, Aarhus University Hospital, Righospitalet, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, Aarhus University, Aarhus, Denmark
| | - Jan Haavik
- Department of Biomedicine, University of Bergen, Bergen, Norway
- Bergen Center of Brain Plasticity, Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
| | - Ole A Andreassen
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- NORMENT, Division of Mental Health and Addiction, Oslo University Hospital, Oslo, Norway
| | - David Rye
- Emory Department of Neurology, Wesley Woods Health Center, Atlanta, GA, USA
| | - Jannicke Igland
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
- Department of Health and Caring sciences, Western Norway University of Applied Sciences, Bergen, Norway
| | - Sisse Rye Ostrowski
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Clinical Immunology, Copenhagen University Hospital, Righospitale, Copenhagen, Denmark
| | - Lili A Milani
- Estonian Genome Centre, Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Lincoln D Nadauld
- Precision Genomics, Intermountain Healthcare, Saint George, Utah, UK
- Stanford University, School of Medicine, Stanford, CA, USA
| | | | - Kari Stefansson
- deCODE genetics/Amgen Inc., Reykjavik, Iceland.
- Faculty of Medicine, University of Iceland, Reykjavik, Iceland.
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Zheng Z, Zhu Z, Pu J, Zhou C, Cao L, Lv D, Lu J, Zhao G, Chen Y, Tian J, Yin X, Zhang B, Yan Y, Zhao G. Early-onset familial essential tremor is associated with nucleotide expansions of spinocerebellar ataxia in China. Mol Biol Rep 2024; 51:113. [PMID: 38227102 DOI: 10.1007/s11033-023-09023-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 10/23/2023] [Indexed: 01/17/2024]
Abstract
BACKGROUND Essential tremor (ET) is a neurological disease characterized by action tremor in upper arms. Although its high heritability and prevalence worldwide, its etiology and association with other diseases are still unknown. METHOD We investigated 10 common spinocerebellar ataxias (SCAs), including SCA1, SCA2, SCA3, SCA6, SCA7, SCA8, SCA12, SCA17, SCA36, dentatorubral-pallidoluysian atrophy (DRPLA) in 92 early-onset familial ET pedigrees in China collected from 2016 to 2022. RESULT We found one SCA12 proband carried 51 CAG repeats within PPP2R2B gene and one SCA3 proband with intermediate CAG repeats (55) with ATXN3 gene. The other 90 ET probands all had normal repeat expansions. CONCLUSION Tremor can be the initial phenotype of certain SCA. For early-onset, familial ET patients, careful physical examinations are needed before genetic SCA screening.
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Affiliation(s)
- Zhilin Zheng
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, China
| | - Zeyu Zhu
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, China
| | - Jiali Pu
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Chen Zhou
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, China
| | - Lanxiao Cao
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, China
| | - Dayao Lv
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, China
| | - Jinyu Lu
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, China
| | - Gaohua Zhao
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, China
| | - Yanxing Chen
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Jun Tian
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Xinzhen Yin
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Baorong Zhang
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China.
| | - Yaping Yan
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China.
| | - Guohua Zhao
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, China.
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China.
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Martuscello RT, Sivaprakasam K, Hartstone W, Kuo SH, Konopka G, Louis ED, Faust PL. Gene Expression Analysis of Laser-Captured Purkinje Cells in the Essential Tremor Cerebellum. CEREBELLUM (LONDON, ENGLAND) 2023; 22:1166-1181. [PMID: 36242761 PMCID: PMC10359949 DOI: 10.1007/s12311-022-01483-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/28/2022] [Indexed: 12/13/2022]
Abstract
Essential tremor (ET) is a common, progressive neurological disease characterized by an 8-12-Hz kinetic tremor. Despite its high prevalence, the patho-mechanisms of tremor in ET are not fully known. Through comprehensive studies in postmortem brains, we identified major morphological changes in the ET cerebellum that reflect cellular damage in Purkinje cells (PCs), suggesting that PC damage is central to ET pathogenesis. We previously performed a transcriptome analysis in ET cerebellar cortex, identifying candidate genes and several dysregulated pathways. To directly target PCs, we purified RNA from PCs isolated by laser capture microdissection and performed the first ever PC-specific RNA-sequencing analysis in ET versus controls. Frozen postmortem cerebellar cortex from 24 ETs and 16 controls underwent laser capture microdissection, obtaining ≥2000 PCs per sample. RNA transcriptome was analyzed via differential gene expression, principal component analysis (PCA), and gene set enrichment analyses (GSEA). We identified 36 differentially expressed genes, encompassing multiple cellular processes. Some ET (13/24) had greater dysregulation of these genes and segregated from most controls and remaining ETs in PCA. Characterization of genes/pathways enriched in this PCA and GSEA identified multiple pathway dysregulations in ET, including RNA processing/splicing, synapse organization/ion transport, and oxidative stress/inflammation. Furthermore, a different set of pathways characterized marked heterogeneity among ET patients. Our data indicate a range of possible mechanisms for the pathogenesis of ET. Significant heterogeneity among ET combined with dysregulation of multiple cellular processes supports the notion that ET is a family of disorders rather than one disease entity.
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Affiliation(s)
- Regina T Martuscello
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center and the New York Presbyterian Hospital, 630 W 168th Street, P&S 15-405, New York, NY, 10032, USA
| | - Karthigayini Sivaprakasam
- Peter O'Donnell Jr. Brain Institute, Department of Neuroscience, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, USA
| | - Whitney Hartstone
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center and the New York Presbyterian Hospital, 630 W 168th Street, P&S 15-405, New York, NY, 10032, USA
| | - Sheng-Han Kuo
- Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University, 650 W 168th Street, BB302, New York, NY, USA
| | - Genevieve Konopka
- Peter O'Donnell Jr. Brain Institute, Department of Neuroscience, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, USA
| | - Elan D Louis
- Department of Neurology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Suite NL9.114, Dallas, TX, USA
| | - Phyllis L Faust
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center and the New York Presbyterian Hospital, 630 W 168th Street, P&S 15-405, New York, NY, 10032, USA.
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8
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Wu XL, Mu DP, Yang QS, Zhang Y, Li YC, Feijó A, Cheng JL, Wen ZX, Lu L, Xia L, Zhou ZJ, Qu YH, Ge DY. Comparative genomics of widespread and narrow-range white-bellied rats in the Niviventer niviventer species complex sheds light on invasive rodent success. Zool Res 2023; 44:1052-1063. [PMID: 37872006 PMCID: PMC10802109 DOI: 10.24272/j.issn.2095-8137.2022.519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 09/12/2023] [Indexed: 10/25/2023] Open
Abstract
Widespread species that inhabit diverse environments possess large population sizes and exhibit a high capacity for environmental adaptation, thus enabling range expansion. In contrast, narrow-range species are confined to restricted geographical areas and are ecologically adapted to narrow environmental conditions, thus limiting their ability to expand into novel environments. However, the genomic mechanisms underlying the differentiation between closely related species with varying distribution ranges remain poorly understood. The Niviventer niviventer species complex (NNSC), consisting of highly abundant wild rats in Southeast Asia and China, offers an excellent opportunity to investigate these questions due to the presence of both widespread and narrow-range species that are phylogenetically closely related. In the present study, we combined ecological niche modeling with phylogenetic analysis, which suggested that sister species cannot be both widespread and dominant within the same geographical region. Moreover, by assessing heterozygosity, linkage disequilibrium decay, and Tajima's D analysis, we found that widespread species exhibited higher genetic diversity than narrow-range species. In addition, by exploring the "genomic islands of speciation", we identified 13 genes in highly divergent regions that were shared by the two widespread species, distinguishing them from their narrow-range counterparts. Functional annotation analysis indicated that these genes are involved in nervous system development and regulation. The adaptive evolution of these genes likely played an important role in the speciation of these widespread species.
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Affiliation(s)
- Xin-Lai Wu
- Key Laboratory of Zoological Systematics and Application of Hebei Province, College of Life Sciences, Hebei University, Baoding, Hebei 071002, China
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China
- Hebei Basic Science Center for Biotic Interaction, Institute of Life Science and Green Development, Hebei University, Baoding, Hebei 071002, China
| | - Dan-Ping Mu
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China
- Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi, Xinjiang 830046, China
| | - Qi-Sen Yang
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China
| | - Yu Zhang
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China
| | - Yu-Chun Li
- Marine College, Shandong University, Weihai, Shandong 264209, China
| | - Anderson Feijó
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China
| | - Ji-Long Cheng
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China
| | - Zhi-Xin Wen
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China
| | - Liang Lu
- State Key Laboratory for Infectious Diseases Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - Lin Xia
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China
| | - Zhi-Jun Zhou
- Key Laboratory of Zoological Systematics and Application of Hebei Province, College of Life Sciences, Hebei University, Baoding, Hebei 071002, China
- Hebei Basic Science Center for Biotic Interaction, Institute of Life Science and Green Development, Hebei University, Baoding, Hebei 071002, China. E-mail:
| | - Yan-Hua Qu
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China. E-mail:
| | - De-Yan Ge
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road, Chaoyang District, Beijing 100101, China. E-mail:
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d’Apolito M, Ceccarini C, Savino R, Adipietro I, di Bari I, Santacroce R, Curcetti M, D’Andrea G, Croce AI, Cesarano C, Polito AN, Margaglione M. A Novel KCNN2 Variant in a Family with Essential Tremor Plus: Clinical Characteristics and In Silico Analysis. Genes (Basel) 2023; 14:1380. [PMID: 37510285 PMCID: PMC10379157 DOI: 10.3390/genes14071380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 06/26/2023] [Accepted: 06/27/2023] [Indexed: 07/30/2023] Open
Abstract
BACKGROUND Essential tremor (ET) is one of the more common movement disorders. Current diagnosis is solely based on clinical findings. ET appears to be inherited in an autosomal dominant pattern. Several loci on specific chromosomes have been studied by linkage analysis, but the causes of essential tremor are still unknown in many patients. Genetic studies described the association of several genes with familial ET. However, they were found only in distinct families, suggesting that some can be private pathogenic variants. AIM OF THE STUDY to characterize the phenotype of an Italian family with ET and identify the genetic variant associated. METHODS Clinical and genetic examinations were performed. Genetic testing was done with whole-exome sequencing (WES) using the Illumina platform. Bidirectional capillary Sanger sequencing was used to investigate the presence of variant in all affected members of the family. In silico prediction of pathogenicity was used to study the effect of gene variants on protein structure. RESULTS The proband was a 15-year-old boy. The patient was the first of two children of a non-consanguineous couple. Family history was remarkable for tremor in the mother line. His mother suffered from bilateral upper extremity kinetic tremors (since she was 20 years old), anxiety, and depression. Other relatives referred bilateral upper extremity tremors. In the index case, WES analysis performed supposing a dominant mode of inheritance, identified a novel heterozygous missense variant in potassium calcium-activated channel subfamily N member 2 (KCNN2) (NM_021614.3: c.1145G>A, p.Gly382Asp). In the pedigree investigation, all carriers of the gene variant had ET and showed variable expressivity, the elder symptomatic relative showing cognitive impairment and hallucinations in the last decade, in addition to tremor since a young age. The amino acid residue #382 is located in a transmembrane region and in silico analysis suggested a causative role for the variant. Modelling of the mutant protein structure showed that the variant causes a clash in the protein structure. Therefore, the variant could cause a conformational change that alters the ability of the protein in the modulation of ion channels Conclusions: The KCNN2 gene variant identified could be associated with ET. The variant could modify a voltage-independent potassium channel activated by intracellular calcium.
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Affiliation(s)
- Maria d’Apolito
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
| | - Caterina Ceccarini
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
| | - Rosa Savino
- Neuropsychiatry for Child and Adolescent Unit, Department of Woman and Child, Policlinico Riuniti, 70122 Foggia, Italy; (R.S.); (A.N.P.)
| | - Iolanda Adipietro
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
| | - Ighli di Bari
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
| | - Rosa Santacroce
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
| | - Maria Curcetti
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
| | - Giovanna D’Andrea
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
| | - Anna-Irma Croce
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
| | - Carla Cesarano
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
| | - Anna Nunzia Polito
- Neuropsychiatry for Child and Adolescent Unit, Department of Woman and Child, Policlinico Riuniti, 70122 Foggia, Italy; (R.S.); (A.N.P.)
| | - Maurizio Margaglione
- Medical Genetics, Department of Clinical and Experimental Medicine, University of Foggia, 70122 Foggia, Italy; (M.d.); (C.C.); (I.A.); (I.d.B.); (R.S.); (M.C.); (G.D.); (A.-I.C.); (C.C.)
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10
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Ghanem A, Berry DS, Farrell K, Cosentino S, Crary JF, Louis ED. Cognitive Performance as a Function of MAPT Haplotype: A Prospective Longitudinal Study of an Essential Tremor Cohort. Tremor Other Hyperkinet Mov (N Y) 2023; 13:19. [PMID: 37214541 PMCID: PMC10198222 DOI: 10.5334/tohm.768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 04/20/2023] [Indexed: 05/24/2023] Open
Abstract
Background Cognitive impairment is a feature of essential tremor (ET). There are no studies of the genetic drivers of this association. We examined whether the microtubule-associated protein tau (MAPT) H1 haplotype is associated with cognitive performance in ET. Methods ET cases genotyped for the MAPT H1 and H2 haplotypes completed a battery of neuropsychological tests at baseline and four follow-up evaluations. Chi-square, t-tests, and analyses of covariance examined associations between the presence of the MAPT H1 haplotype, cognitive diagnoses of normal, mild cognitive impairment (MCI), and dementia, and performance in specific cognitive domains. Results We observed no evidence of cognitive differences as a function of the presence of the MAPT H1 haplotype. Specifically, cases with (n = 57) and without (n = 42) this haplotype did not differ with respect to the prevalence of diagnoses of MCI or dementia, p ≥ 0.87. Moreover, cases with vs without this haplotype did not differ in either the age or point in the disease course at which observed conversions to MCI or dementia occurred, p's ≥ 0.51. Finally, no haplotype-related differences were observed in performance in the cognitive domains of attention, executive function, language, memory, visuospatial or global ability, p's ≥ 0.21, or in changes in performance in these domains across time, p's ≥ 0.08. Discussion The study in an ET cohort revealed no influence of MAPT haplotypes on cognitive performance. This study serves as a valuable foundation for future studies to expand our understanding of the genetic drivers of cognitive impairment in ET. Highlights This study found no evidence of cognitive differences between individuals with and without the MAPT H1 haplotype. Our work provides a valuable foundation for future work to expand our knowledge of the genetic drivers of cognitive impairment in ET.
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Affiliation(s)
- Ali Ghanem
- Department of Neurology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Diane S. Berry
- Department of Neurology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Kurt Farrell
- Department of Pathology, Department of Artificial Intelligence & Human Health, Nash Family Department of Neuroscience, Ronald M. Loeb Center for Alzheimer’s Disease, Friedman Brain Institute, Neuropathology Brain Bank & Research CoRE, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Stephanie Cosentino
- Taub Institute for Research on Alzheimer’s Disease and the Aging Brain, New York, USA
- Department of Neurology, Columbia University Irving Medical Center, New York, USA
| | - John F. Crary
- Department of Pathology, Department of Artificial Intelligence & Human Health, Nash Family Department of Neuroscience, Ronald M. Loeb Center for Alzheimer’s Disease, Friedman Brain Institute, Neuropathology Brain Bank & Research CoRE, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Elan D. Louis
- Department of Neurology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
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11
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Lenka A, Pandey S. Dystonia and tremor: Do they have a shared biology? INTERNATIONAL REVIEW OF NEUROBIOLOGY 2023; 169:413-439. [PMID: 37482399 DOI: 10.1016/bs.irn.2023.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
Dystonia and tremor are the two most commonly encountered hyperkinetic movement disorders encountered in clinical practice. While there has been substantial progress in the research on these two disorders, there also exists a lot of gray areas. Entities such as dystonic tremor and tremor associated with dystonia occupy a major portion of the "gray zone". In addition, there is a marked clinical heterogeneity and overlap of several clinical and epidemiological features among dystonia and tremor. These facts raise the possibility that dystonia and tremor could be having shared biology. In this chapter, we revisit critical aspects of this possibility that may have important clinical and research implications in the future. We comprehensively review the points in favor and against the theory that dystonia and tremor have shared biology from clinical, epidemiological, genetic and neuroimaging studies.
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Affiliation(s)
- Abhishek Lenka
- Parkinson's Disease Center and Movement Disorders Clinic, Baylor College of Medicine, Houston, TX, United States
| | - Sanjay Pandey
- Department of Neurology, Amrita Hospital, Faridabad, Delhi National Capital Region, India.
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12
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Cao L, Gu L, Pu J, Lv D, Tian J, Yin X, Gao T, Song Z, Lu J, Zhao G, Zhang B, Yan Y, Zhao G. Association Analysis of 27 Single Nucleotide Polymorphisms in a Chinese Population with Essential Tremor. J Mol Neurosci 2023; 73:205-213. [PMID: 36929462 DOI: 10.1007/s12031-023-02106-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Accepted: 02/17/2023] [Indexed: 03/18/2023]
Abstract
Genetic factors play a major role in essential tremor (ET) pathogenesis. This study aimed to assess variant burden in ET-associated genes in a relatively large Chinese population cohort. We genotyped 27 single nucleotide polymorphisms (SNPs) previously reported to be associated with ET by multiplex PCR amplicon sequencing assay in 488 familial and sporadic ET patients and 514 healthy controls (HCs). Then, we performed allelic and genotypic association test by Pearson chi-square test or Fisher's exact test. A total of 1002 samples were included in our analysis, consisting of 488 ET patients and 514 sex and age-matched HCs. For rs10937625, the C allele was linked to increased risk of ET (P = 0.019, OR = 1.503, 95% CI = 1.172-1.928). The carriers of the C/C homozygote and C/T heterozygote showed a significantly higher risk of ET, compared with the T/T homozygote under the dominant model (P = 0.019, OR = 1.628, 95% CI = 1.221-2.170). There were no statistically significant differences in the frequency of other SNPs between ET patients and healthy controls. Rs10937625 (STK32B) may increase the risk of ET in eastern Chinese population.
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Affiliation(s)
- Lanxiao Cao
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Luyan Gu
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jiali Pu
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Dayao Lv
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jun Tian
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xinzhen Yin
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Ting Gao
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Zhe Song
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jinyu Lu
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Gaohua Zhao
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Baorong Zhang
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Yaping Yan
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
| | - Guohua Zhao
- Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China. .,Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
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13
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Marsili L, Bologna M, Mahajan A. Diagnostic Uncertainties in Tremor. Semin Neurol 2023; 43:156-165. [PMID: 36913973 DOI: 10.1055/s-0043-1763508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
The approach and diagnosis of patients with tremor may be challenging for clinicians. According to the most recent consensus statement by the Task Force on Tremor of the International Parkinson Movement Disorder Society, the differentiation between action (i.e., kinetic, postural, intention), resting, and other task- and position-specific tremors is crucial to this goal. In addition, patients with tremor must be carefully examined for other relevant features, including the topography of the tremor, since it can involve different body areas and possibly associate with neurological signs of uncertain significance. Following the characterization of major clinical features, it may be useful to define, whenever possible, a particular tremor syndrome and to narrow down the spectrum of possible etiologies. First, it is important to distinguish between physiological and pathological tremor, and, in the latter case, to differentiate between the underlying pathological conditions. A correct approach to tremor is particularly relevant for appropriate referral, counseling, prognosis definition, and therapeutic management of patients. The purpose of this review is to outline the possible diagnostic uncertainties that may be encountered in clinical practice in the approach to patients with tremor. In addition to an emphasis on a clinical approach, this review discusses the important ancillary role of neurophysiology and innovative technologies, neuroimaging, and genetics in the diagnostic process.
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Affiliation(s)
- Luca Marsili
- Department of Neurology and Rehabilitation Medicine, Gardner Family Center for Parkinson's Disease and Movement Disorders, University of Cincinnati, Cincinnati, Ohio
| | - Matteo Bologna
- Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy.,IRCCS Neuromed, Pozzilli, Isernia, Italy
| | - Abhimanyu Mahajan
- Rush Parkinson's Disease and Movement Disorders Program, Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois
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14
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Chi W, Wu M, Wang HL, Wu QY, Zhang YP, Hu YN, Zhu YB, Lin XF, Chen T, Luo JW, Ruan XL, Li YF. Han family with essential tremor caused by the P421L variant of the TENM4 gene in China. Neurol Sci 2023; 44:2003-2015. [PMID: 36689009 DOI: 10.1007/s10072-023-06603-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 01/04/2023] [Indexed: 01/24/2023]
Abstract
BACKGROUND Essential tremor (ET) is an autosomal dominant inheritance disorder. Mutations in fusion sarcoma (FUS), mitochondrial serine peptidase 2 (HTRA2), teneurin transmembrane protein 4 (TENM4), sortilin1 (SORT1), SCN11A, and notch2N-terminal-like (NOTCH2NLC) genes are associated with familial ET. METHODS A proband with ET was tested using whole-exome sequencing and repeat-primed polymerase chain reaction. Subsequently, the family members were screened for the suspected mutation, and the results were verified using Sanger sequencing. The relationship between pedigree and phenotype was also analyzed, and structural and functional changes in the variants were predicted using bioinformatics analysis. RESULTS In a family with ET, the proband (III4) and the proband's father (II1), grandfather (I1), uncle (II2), and cousin (III5) all presented with involuntary tremors of both upper limbs. The responsible mutation was identified as TENM4 c.1262C > T (p.P421L), which showed genetic co-segregation in the family survey. AlphaFold predicted a change in the spatial position of TENM4 after the P421L mutation, which may have affected its stability. AlphaFold also predicted P421L to be a deleterious variation, which would lead to lower degrees of freedom of the TENM4 protein, thereby affecting the protein's structure and stability. According to the bioinformatics analysis, TENM4 (p.P421L) may reduce the signal reaching the nucleus by affecting the expression of TENM4 messenger RNA (mRNA), thereby impairing the normal oligodendrocyte differentiation process and leading to impaired myelination. CONCLUSION This study revealed that the TENM4 (p.P421L) pathogenic missense variation was responsible for ET in the proband.
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Affiliation(s)
- Wu Chi
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China.,Emergency Department, Fujian Provincial Hospital, Fuzhou, 350001, China.,Fujian Provincial Key Laboratory of Emergency Medicine, Fujian Provincial Institute of Emergency MedicineFujian Emergency Medical Center, Fuzhou, 350001, China
| | - Min Wu
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China
| | - Han-Lu Wang
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China
| | - Qiu-Yan Wu
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China
| | - Yan-Ping Zhang
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China
| | - Ya-Nan Hu
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China
| | - Yao-Bin Zhu
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China.,Department of Traditional Chinese Medicine, The First Affiliated Hospital, Fujian Medical University, Fuzhou, 350005, China
| | - Xin-Fu Lin
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China.,Department of Pediatrics, Fujian Provincial Hospital, Fuzhou, 350001, China
| | - Ting Chen
- Department of Traditional Chinese Medicine, Fujian Provincial Hospital, Fuzhou, 350001, China.
| | - Jie-Wei Luo
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China. .,Department of Traditional Chinese Medicine, Fujian Provincial Hospital, Fuzhou, 350001, China.
| | - Xing-Lin Ruan
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, 350001, China.
| | - Yun-Fei Li
- Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, China. .,Department of Neurology, Fujian Provincial Hospital, Fuzhou, 350001, China.
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15
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Voice Tremor and Botulinum Neurotoxin Therapy: A Contemporary Review. Toxins (Basel) 2022; 14:toxins14110773. [PMID: 36356023 PMCID: PMC9698548 DOI: 10.3390/toxins14110773] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 11/02/2022] [Accepted: 11/07/2022] [Indexed: 11/11/2022] Open
Abstract
Voice tremor is a common, yet debilitating symptom for patients suffering from a number of tremor-associated disorders. The key to targeting effective treatments for voice tremor requires a fundamental understanding of the pathophysiology that underpins the tremor mechanism and accurate identification of the disease in affected patients. An updated review of the literature detailing the current understanding of voice tremor (with or without essential tremor), its accurate diagnosis and targeted treatment options was conducted, with a specific focus on the role of botulinum neurotoxin. Judicious patient selection, following detailed characterisation of voice tremor qualities, is essential to optimising treatment outcomes for botulinum neurotoxin therapy, as well as other targeted therapies. Further focused investigation is required to characterise the response to targeted treatment in voice tremor patients and to guide the development of innovative treatment options.
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16
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Clark LN, Gao Y, Wang GT, Hernandez N, Ashley-Koch A, Jankovic J, Ottman R, Leal SM, Rodriguez SMB, Louis ED. Whole genome sequencing identifies candidate genes for familial essential tremor and reveals biological pathways implicated in essential tremor aetiology. EBioMedicine 2022; 85:104290. [PMID: 36183486 PMCID: PMC9525816 DOI: 10.1016/j.ebiom.2022.104290] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 08/25/2022] [Accepted: 09/13/2022] [Indexed: 12/13/2022] Open
Abstract
Background Essential tremor (ET), one of the most common neurological disorders, has a phenotypically heterogeneous presentation characterized by bilateral kinetic tremor of the arms and, in some patients, tremor involving other body regions (e.g., head, voice). Genetic studies suggest that ET is genetically heterogeneous. Methods We analyzed whole genome sequence data (WGS) generated on 104 multi-generational white families with European ancestry affected by ET. Genome-wide parametric linkage and association scans were analyzed using adjusted logistic regression models through the application of the Pseudomarker software. To investigate the additional contribution of rare variants in familial ET, we also performed an aggregate variant non-parametric linkage (NPL) analysis using the collapsed haplotype method implemented in CHP-NPL software. Findings Parametric linkage analysis of common variants identified several loci with significant evidence of linkage (HLOD ≥3.6). Among the gene regions within the strongest ET linkage peaks were BTC (4q13.3, HLOD=4.53), N6AMT1 (21q21.3, HLOD=4.31), PCDH9 (13q21.32, HLOD=4.21), EYA1 (8q13.3, HLOD=4.04), RBFOX1 (16p13.3, HLOD=4.02), MAPT (17q21.31, HLOD=3.99) and SCARB2 (4q21.1, HLOD=3.65). CHP-NPL analysis identified fifteen additional genes with evidence of significant linkage (LOD ≥3.8). These genes include TUBB2A, VPS33B, STEAP1B, SPINK5, ZRANB1, TBC1D3C, PDPR, NPY4R, ETS2, ZNF736, SPATA21, ARL17A, PZP, BLK and CCDC94. In one ET family contributing to the linkage peak on chromosome 16p13.3, we identified a likely pathogenic heterozygous canonical splice acceptor variant in exon 2 of RBFOX1 (ENST00000547372; c.4-2A>G), that co-segregated with the ET phenotype in the family. Interpretation Linkage and association analyses of WGS identified several novel ET candidate genes, which are implicated in four major pathways that include 1) the epidermal growth factor receptor-phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha-AKT serine/threonine kinase 1 (EGFR-PI3K-AKT) and Mitogen-activated protein Kinase 1 (ERK) pathways, 2) Reactive oxygen species (ROS) and DNA repair, 3) gamma-aminobutyric acid-ergic (GABAergic) system and 4) RNA binding and regulation of RNA processes. Our study provides evidence for a possible overlap in the genetic architecture of ET, neurological disease, cancer and aging. The genes and pathways identified can be prioritized in future genetic and functional studies. Funding National Institutes of Health, NINDS, NS073872 (USA) and NIA AG058131(USA).
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Affiliation(s)
- Lorraine N Clark
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; The Taub Institute for Research on Alzheimer's Disease and The Aging Brain, Columbia University Irving Medical Center, New York, NY, USA.
| | - Yizhe Gao
- The G.H. Sergievsky Center, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; The Center for Statistical Genetics, Columbia University Irving Medical Center, New York, NY, USA
| | - Gao T Wang
- The G.H. Sergievsky Center, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; The Center for Statistical Genetics, Columbia University Irving Medical Center, New York, NY, USA
| | - Nora Hernandez
- Department of Neurology, University of Texas Southwestern Medical Center, Dallas TX, USA
| | - Allison Ashley-Koch
- Duke Molecular Physiology Institute, Duke University Medical Center, Durham, NC, USA
| | - Joseph Jankovic
- Parkinson's Disease Center and Movement Disorders Clinic, Department of Neurology, Baylor College of Medicine, Houston TX, USA
| | - Ruth Ottman
- The G.H. Sergievsky Center, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; Department of Epidemiology, Mailman School of Public Health, Columbia University Irving Medical Center, New York, NY, USA; Division of Translational Epidemiology, New York State Psychiatric Institute, New York, NY, USA
| | - Suzanne M Leal
- The Taub Institute for Research on Alzheimer's Disease and The Aging Brain, Columbia University Irving Medical Center, New York, NY, USA; The G.H. Sergievsky Center, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; The Center for Statistical Genetics, Columbia University Irving Medical Center, New York, NY, USA
| | - Sandra M Barral Rodriguez
- The Taub Institute for Research on Alzheimer's Disease and The Aging Brain, Columbia University Irving Medical Center, New York, NY, USA; The G.H. Sergievsky Center, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA; Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA.
| | - Elan D Louis
- Department of Neurology, University of Texas Southwestern Medical Center, Dallas TX, USA.
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Kakoti BB, Bezbaruah R, Ahmed N. Therapeutic drug repositioning with special emphasis on neurodegenerative diseases: Threats and issues. Front Pharmacol 2022; 13:1007315. [PMID: 36263141 PMCID: PMC9574100 DOI: 10.3389/fphar.2022.1007315] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 09/12/2022] [Indexed: 11/21/2022] Open
Abstract
Drug repositioning or repurposing is the process of discovering leading-edge indications for authorized or declined/abandoned molecules for use in different diseases. This approach revitalizes the traditional drug discovery method by revealing new therapeutic applications for existing drugs. There are numerous studies available that highlight the triumph of several drugs as repurposed therapeutics. For example, sildenafil to aspirin, thalidomide to adalimumab, and so on. Millions of people worldwide are affected by neurodegenerative diseases. According to a 2021 report, the Alzheimer's disease Association estimates that 6.2 million Americans are detected with Alzheimer's disease. By 2030, approximately 1.2 million people in the United States possibly acquire Parkinson's disease. Drugs that act on a single molecular target benefit people suffering from neurodegenerative diseases. Current pharmacological approaches, on the other hand, are constrained in their capacity to unquestionably alter the course of the disease and provide patients with inadequate and momentary benefits. Drug repositioning-based approaches appear to be very pertinent, expense- and time-reducing strategies for the enhancement of medicinal opportunities for such diseases in the current era. Kinase inhibitors, for example, which were developed for various oncology indications, demonstrated significant neuroprotective effects in neurodegenerative diseases. This review expounds on the classical and recent examples of drug repositioning at various stages of drug development, with a special focus on neurodegenerative disorders and the aspects of threats and issues viz. the regulatory, scientific, and economic aspects.
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Affiliation(s)
- Bibhuti Bhusan Kakoti
- Department of Pharmaceutical Sciences, Faculty of Science and Engineering, Dibrugarh University, Dibrugarh, India
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18
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Marsili L, Duque KR, Bode RL, Kauffman MA, Espay AJ. Uncovering Essential Tremor Genetics: The Promise of Long-Read Sequencing. Front Neurol 2022; 13:821189. [PMID: 35401394 PMCID: PMC8983820 DOI: 10.3389/fneur.2022.821189] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 02/25/2022] [Indexed: 12/23/2022] Open
Abstract
Long-read sequencing (LRS) technologies have been recently introduced to overcome intrinsic limitations of widely-used next-generation sequencing (NGS) technologies, namely the sequencing limited to short-read fragments (150–300 base pairs). Since its introduction, LRS has permitted many successes in unraveling hidden mutational mechanisms. One area in clinical neurology in need of rethinking as it applies to genetic mechanisms is essential tremor (ET). This disorder, among the most common in neurology, is a syndrome often exhibiting an autosomal dominant pattern of inheritance whose large phenotypic spectrum suggest a multitude of genetic etiologies. Exome sequencing has revealed the genetic etiology only in rare ET families (FUS, SORT1, SCN4A, NOS3, KCNS2, HAPLN4/BRAL2, and USP46). We hypothesize that a reason for this shortcoming may be non-classical genetic mechanism(s) underpinning ET, among them trinucleotide, tetranucleotide, or pentanucleotide repeat disorders. In support of this hypothesis, trinucleotide (e.g., GGC repeats in NOTCH2NLC) and pentanucleotide repeat disorders (e.g., ATTTC repeats in STARD7) have been revealed as pathogenic in patients with a past history of what has come to be referred to as “ET plus,” bilateral hand tremor associated with epilepsy and/or leukoencephalopathy. A systematic review of LRS in neurodegenerative disorders showed that 10 of the 22 (45%) genetic etiologies ascertained by LRS include tremor in their phenotypic spectrum, suggesting that future clinical applications of LRS for tremor disorders may uncover genetic subtypes of familial ET that have eluded NGS, particularly those with associated leukoencephalopathy or family history of epilepsy. LRS provides a pathway for potentially uncovering novel genes and genetic mechanisms, helping narrow the large proportion of “idiopathic” ET.
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Affiliation(s)
- Luca Marsili
- James J. and Joan A. Gardner Center for Parkinson's Disease and Movement Disorders, Department of Neurology, University of Cincinnati, Cincinnati, OH, United States
| | - Kevin R. Duque
- James J. and Joan A. Gardner Center for Parkinson's Disease and Movement Disorders, Department of Neurology, University of Cincinnati, Cincinnati, OH, United States
| | - Rachel L. Bode
- James J. and Joan A. Gardner Center for Parkinson's Disease and Movement Disorders, Department of Neurology, University of Cincinnati, Cincinnati, OH, United States
| | - Marcelo A. Kauffman
- Consultorio y Laboratorio de Neurogenética, Centro Universitario de Neurología José María Ramos Mejía, Buenos Aires, Argentina
| | - Alberto J. Espay
- James J. and Joan A. Gardner Center for Parkinson's Disease and Movement Disorders, Department of Neurology, University of Cincinnati, Cincinnati, OH, United States
- *Correspondence: Alberto J. Espay
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19
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Pan MK, Kuo SH. Essential tremor: Clinical perspectives and pathophysiology. J Neurol Sci 2022; 435:120198. [PMID: 35299120 PMCID: PMC10363990 DOI: 10.1016/j.jns.2022.120198] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 12/01/2021] [Accepted: 02/17/2022] [Indexed: 12/12/2022]
Abstract
Essential tremor (ET) is one of the most common neurological disorders and can be highly disabling. In recent years, studies on the clinical perspectives and pathophysiology have advanced our understanding of ET. Specifically, clinical heterogeneity of ET, with co-existence of tremor and other neurological features such as dystonia, ataxia, and cognitive dysfunction, has been identified. The cerebellum has been found to be the key brain region for tremor generation, and structural alterations of the cerebellum have been extensively studied in ET. Finally, four main ET pathophysiologies have been proposed: 1) environmental exposures to β-carboline alkaloids and the consequent olivocerebellar hyper-excitation, 2) cerebellar GABA deficiency, 3) climbing fiber synaptic pathology with related cerebellar oscillatory activity, 4) extra-cerebellar oscillatory activity. While these four theories are not mutually exclusive, they can represent distinctive ET subtypes, indicating multiple types of abnormal brain circuitry can lead to action tremor. This article is part of the Special Issue "Tremor" edited by Daniel D. Truong, Mark Hallett, and Aasef Shaikh.
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20
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Liao C, Castonguay CE, Heilbron K, Vuokila V, Medeiros M, Houle G, Akçimen F, Ross JP, Catoire H, Diez-Fairen M, Kang J, Mueller SH, Girard SL, Hopfner F, Lorenz D, Clark LN, Soto-Beasley AI, Klebe S, Hallett M, Wszolek ZK, Pendziwiat M, Lorenzo-Betancor O, Seppi K, Berg D, Vilariño-Güell C, Postuma RB, Bernard G, Dupré N, Jankovic J, Testa CM, Ross OA, Arzberger T, Chouinard S, Louis ED, Mandich P, Vitale C, Barone P, García-Martín E, Alonso-Navarro H, Agúndez JAG, Jiménez-Jiménez FJ, Pastor P, Rajput A, Deuschl G, Kuhlenbaümer G, Meijer IA, Dion PA, Rouleau GA. Association of Essential Tremor With Novel Risk Loci: A Genome-Wide Association Study and Meta-analysis. JAMA Neurol 2022; 79:185-193. [PMID: 34982113 PMCID: PMC8728658 DOI: 10.1001/jamaneurol.2021.4781] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Question Can common genetic variants associated with essential tremor (ET) be identified? Findings In this genome-wide association study and meta-analysis including genetic data on 483 054 individuals, 5 genome-wide significant loci were associated with risk of ET and common variants were associated with approximately 18% of ET heritability. Meaning Findings of this study may help identify new genes and inform ET biology. Importance Essential tremor (ET) is one of the most common movement disorders, affecting 5% of the general population older than 65 years. Common variants are thought to contribute toward susceptibility to ET, but no variants have been robustly identified. Objective To identify common genetic factors associated with risk of ET. Design, Setting, and Participants Case-control genome-wide association study. Inverse-variance meta-analysis was used to combine cohorts. Multicenter samples collected from European populations were collected from January 2010 to September 2019 as part of an ongoing study. Included patients were clinically diagnosed with or reported having ET. Control individuals were not diagnosed with or reported to have ET. Of 485 250 individuals, data for 483 054 passed data quality control and were used. Main Outcomes and Measures Genotypes of common variants associated with risk of ET. Results Of the 483 054 individuals included, there were 7177 with ET (3693 [51.46%] female; mean [SD] age, 62.66 [15.12] years), and 475 877 control individuals (253 785 [53.33%] female; mean [SD] age, 56.40 [17.6] years). Five independent genome-wide significant loci and were identified and were associated with approximately 18% of ET heritability. Functional analyses found significant enrichment in the cerebellar hemisphere, cerebellum, and axonogenesis pathways. Genetic correlation (r), which measures the degree of genetic overlap, revealed significant common variant overlap with Parkinson disease (r, 0.28; P = 2.38 × 10−8) and depression (r, 0.12; P = 9.78 × 10−4). A separate fine-mapping of transcriptome-wide association hits identified genes such as BACE2, LRRN2, DHRS13, and LINC00323 in disease-relevant brain regions, such as the cerebellum. Conclusions and Relevance The results of this genome-wide association study suggest that a portion of ET heritability can be explained by common genetic variation and can help identify new common genetic risk factors for ET.
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Affiliation(s)
- Calwing Liao
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Charles-Etienne Castonguay
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | | | - Veikko Vuokila
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Miranda Medeiros
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Gabrielle Houle
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Fulya Akçimen
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Jay P Ross
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Helene Catoire
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Monica Diez-Fairen
- Fundació Docència i Recerca Mútua Terrassa, University Hospital Mútua de Terrassa, Terrassa, Barcelona, Spain.,Movement Disorders Unit, Department of Neurology, University Hospital Mútua de Terrassa, Terrassa, Barcelona, Spain
| | - Jooeun Kang
- Division of Genetic Medicine, Department of Medicine, Vanderbilt Genetics Institute, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Stefanie H Mueller
- Institute of Health Informatics, University College London, London, United Kingdom
| | - Simon L Girard
- Département des Sciences Fondamentales, Université du Québec à Chicoutimi, Saguenay, Quebec, Canada.,Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | | | - Delia Lorenz
- University Children's Hospital, University of Würzburg, Wurzburg, Germany
| | - Lorraine N Clark
- Department of Pathology and Cell Biology, Taub Institute, Columbia University, New York, New York
| | | | - Stephan Klebe
- Department of Neurology, University Hospital Würzburg, Wurzburg, Germany.,Department of Neurology, University Hospital Essen, Essen, Germany
| | - Mark Hallett
- National Institute of Neurological Disorders and Stroke Intramural Research Program, National Institutes of Health, Bethesda, Maryland
| | | | - Manuela Pendziwiat
- Institute of Clinical Molecular Biology, University of Kiel, Kiel, Germany.,Department of Neuropediatrics, University Medical Center Schleswig-Holstein, University of Kiel, Kiel, Germany
| | - Oswaldo Lorenzo-Betancor
- Veterans Affairs Puget Sound Health Care System, Seattle, Washington.,Department of Neurology, University of Washington School of Medicine, Seattle
| | - Klaus Seppi
- Department of Neurology, Innsbruck Medical University, Innsbruck, Austria
| | - Daniela Berg
- Department of Neurology, University Hospital Schleswig-Holstein, University of Kiel, Kiel, Germany
| | - Carles Vilariño-Güell
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Ronald B Postuma
- Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Geneviève Bernard
- Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada.,Division of Pediatric Neurology, Departments of Pediatrics, Neurology and Neurosurgery, Montreal Children's Hospital, Montreal, Quebec, Canada.,Child Health and Human Development Program, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.,Division of Medical Genetics, Department of Specialized Medicine, Montreal Children's Hospital, McGill University Health Centre, Montreal, Quebec, Canada
| | - Nicolas Dupré
- Faculté de Médecine, Université Laval, Centre Hospitalier Universitaire de Québec (l'Enfant-Jésus), Quebec, Canada
| | - Joseph Jankovic
- Parkinson's Disease Center and Movement Disorders Clinic, Department of Neurology, Baylor College of Medicine, Houston, Texas
| | - Claudia M Testa
- Parkinson's and Movement Disorders Center, Department of Neurology, Virginia Commonwealth University, Richmond
| | - Owen A Ross
- Departments of Neuroscience and Clinical Genomics, Mayo Clinic Florida, Jacksonville
| | - Thomas Arzberger
- Department of Psychiatry and Psychotherapy, University Hospital, Ludwig-Maximilians-University Munich, Munich, Germany.,Center for Neuropathology and Prion Research, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Sylvain Chouinard
- Unité des troubles du mouvement André Barbeau, Centre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
| | - Elan D Louis
- Department of Neurology, The University of Texas Southwestern Medical Center, Dallas
| | - Paola Mandich
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health (DINOGMI), University of Genoa, Genova, Italy.,Istituto di Ricovero e Cura a Carattere Scientifico Policlinico, San Martino, Genova, Italy
| | - Carmine Vitale
- Department of Motor Sciences and Wellness, University Parthenope, Naples, Italy
| | - Paolo Barone
- Center for Neurodegenerative Disease (CEMAND), Department of Medicine, Surgery and Dentistry, Scuola Medica Salernitana, University of Salerno, Baronissi, Salerno, Italy
| | - Elena García-Martín
- University Institute of Molecular Pathology Biomarkers, UNEx, ARADyAL Instituto de Salud Carlos III, Caceres, Spain
| | | | - José A G Agúndez
- University Institute of Molecular Pathology Biomarkers, UNEx, ARADyAL Instituto de Salud Carlos III, Caceres, Spain
| | | | - Pau Pastor
- Fundació Docència i Recerca Mútua Terrassa, University Hospital Mútua de Terrassa, Terrassa, Barcelona, Spain
| | - Alex Rajput
- University of Saskatchewan, Saskatoon Health Authority, Saskatoon, Saskatchewan, Canada
| | - Günther Deuschl
- Department of Neurology, University Medical Center Schleswig Holstein, University of Kiel, Kiel, Germany
| | - Gregor Kuhlenbaümer
- Department of Neurology, University Hospital Schleswig-Holstein, University of Kiel, Kiel, Germany
| | - Inge A Meijer
- Department of Neuroscience and Pediatrics, Université de Montréal, Montreal, Quebec, Canada
| | - Patrick A Dion
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Guy A Rouleau
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
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Lan L, Zhao X, Jian S, Li C, Wang M, Zhou Q, Huang S, Zhu S, Kang H, Kirsch HE. Investigation of the risk of valproic acid-induced tremor: clinical, neuroimaging, and genetic factors. Psychopharmacology (Berl) 2022; 239:173-184. [PMID: 34718848 DOI: 10.1007/s00213-021-06004-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 10/12/2021] [Indexed: 11/08/2022]
Abstract
RATIONALE Investigation of associated risk factors of valproic acid (VPA)-induced tremor helped in increasing tolerance and optimizing treatment scheme individually. OBJECTIVES To determine the risk factors of VPA-induced tremor, with particular attention on identifying tremor-susceptible gene mutations. METHODS Epileptic patients taking VPA were divided into a tremor and a non-tremor groups. A mutation of rs9652490 in the leucine-rich repeat and immunoglobulin domain-containing Nogo-receptor-interacting protein 1 (LINGO-1) gene was determined by Sanger sequencing. Cerebellar atrophy was assessed, and various cerebellar dimensions were measured on magnetic resonance imaging (MRI) scans. RESULTS One hundred and eighty-one of 200 subjects were included. Multivariate regression analysis indicated several VPA-induced tremor-related factors: females (OR = 2.718, p = 0.014), family history of tremor (OR = 7.595, p = 0.003), treatment duration (> 24 months; OR = 3.294, p = 0.002), and daily dosage (> 1,000 mg/d; OR = 19.801, p = 0.008) of VPA. Chi-square tests revealed that treatment with VPA magnesium-ER (p = 0.030) and carbamazepine combination (p = 0.040) reduced the incidence of tremor. One hundred and seventy-six gene sequencing and 86 MRI results excluded any significant difference between the two groups in the mutation of rs9652490 within LINGO-1, the ratio of cerebellar atrophy or the cerebellar-dimension values (p > 0.05). However, mutation of rs9652490 within LINGO-1 was correlated with increased cerebellar atrophy (p = 0.001), reduced cerebellar hemisphere thickness (p = 0.025), and right cerebellar hemisphere longitudinal diameter (p = 0.047). CONCLUSIONS Our cohort indicated risk (female, positive family history of tremor, daily dosage > 1000 mg and treatment duration > 24 months of VPA) and protective factors (VPA magnesium-ER and combination with CBZ) of VPA-induced tremor. Mutation of rs9652490 within LINGO-1 correlated with cerebellar atrophy, neither was correlated with VPA-induced tremor.
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Affiliation(s)
- Lili Lan
- Department of Neurology, Tongji Hospital Affiliated To Tongji Medical College, Huazhong University of Science and Technology, No. 1095 Jiefang Blvd, Wuhan, 430030, People's Republic of China
| | - Xu Zhao
- Department of Radiology, Tongji Hospital Affiliated To Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Si Jian
- Department of Radiology, Tongji Hospital Affiliated To Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Cun Li
- Department of Neurology, Tongji Hospital Affiliated To Tongji Medical College, Huazhong University of Science and Technology, No. 1095 Jiefang Blvd, Wuhan, 430030, People's Republic of China
| | - Man Wang
- Department of Neurology, Tongji Hospital Affiliated To Tongji Medical College, Huazhong University of Science and Technology, No. 1095 Jiefang Blvd, Wuhan, 430030, People's Republic of China
| | - Qing Zhou
- Department of Neurology, Tongji Hospital Affiliated To Tongji Medical College, Huazhong University of Science and Technology, No. 1095 Jiefang Blvd, Wuhan, 430030, People's Republic of China
| | - Shanshan Huang
- Department of Neurology, Tongji Hospital Affiliated To Tongji Medical College, Huazhong University of Science and Technology, No. 1095 Jiefang Blvd, Wuhan, 430030, People's Republic of China
| | - Suiqiang Zhu
- Department of Neurology, Tongji Hospital Affiliated To Tongji Medical College, Huazhong University of Science and Technology, No. 1095 Jiefang Blvd, Wuhan, 430030, People's Republic of China
| | - Huicong Kang
- Department of Neurology, Tongji Hospital Affiliated To Tongji Medical College, Huazhong University of Science and Technology, No. 1095 Jiefang Blvd, Wuhan, 430030, People's Republic of China.
| | - Heidi E Kirsch
- Department of Neurology and Radiology & Biomedical Imaging, Epilepsy Center, University of California, San Francisco, CA, 94143-0628, USA
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22
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Abstract
Essential tremor (ET) is one of the most common movement disorders, with a reported >60 million affected individuals worldwide. The definition and underlying pathophysiology of ET are contentious. Patients present primarily with motor features such as postural and action tremors, but may also have other non-motor features, including cognitive impairment and neuropsychiatric symptoms. Genetics account for most of the ET risk but environmental factors may also be involved. However, the variable penetrance and challenges in validating data make gene-environment analysis difficult. Structural changes in cerebellar Purkinje cells and neighbouring neuronal populations have been observed in post-mortem studies, and other studies have found GABAergic dysfunction and dysregulation of the cerebellar-thalamic-cortical circuitry. Commonly prescribed medications include propranolol and primidone. Deep brain stimulation and ultrasound thalamotomy are surgical options in patients with medically intractable ET. Further research in post-mortem studies, and animal and cell-based models may help identify new pathophysiological clues and therapeutic targets and, together with advances in omics and machine learning, may facilitate the development of precision medicine for patients with ET.
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Jiménez-Jiménez FJ, Alonso-Navarro H, García-Martín E, Álvarez I, Pastor P, Agúndez JAG. Genomic Markers for Essential Tremor. Pharmaceuticals (Basel) 2021; 14:ph14060516. [PMID: 34072005 PMCID: PMC8226734 DOI: 10.3390/ph14060516] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/23/2021] [Accepted: 05/24/2021] [Indexed: 12/13/2022] Open
Abstract
There are many reports suggesting an important role of genetic factors in the etiopathogenesis of essential tremor (ET), encouraging continuing the research for possible genetic markers. Linkage studies in families with ET have identified 4 genes/loci for familial ET, although the responsible gene(s) have not been identified. Genome-wide association studies (GWAS) described several variants in LINGO1, SLC1A2, STK32B, PPARGC1A, and CTNNA3, related with ET, but none of them have been confirmed in replication studies. In addition, the case-control association studies performed for candidate variants have not convincingly linked any gene with the risk for ET. Exome studies described the association of several genes with familial ET (FUS, HTRA2, TENM4, SORT1, SCN11A, NOTCH2NLC, NOS3, KCNS2, HAPLN4, USP46, CACNA1G, SLIT3, CCDC183, MMP10, and GPR151), but they were found only in singular families and, again, not found in other families or other populations, suggesting that some can be private polymorphisms. The search for responsible genes for ET is still ongoing.
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Affiliation(s)
- Félix Javier Jiménez-Jiménez
- Section of Neurology, Hospital Universitario del Sureste, E28500 Arganda del Rey, Spain;
- Correspondence: ; Tel.: +34-636-96-83-95; Fax: +34-913-28-07-04
| | | | - Elena García-Martín
- ARADyAL Instituto de Salud Carlos III, University Institute of Molecular Pathology Biomarkers, University of Extremadura, E10071 Caceres, Spain; (E.G.-M.); (J.A.G.A.)
| | - Ignacio Álvarez
- Movement Disorders Unit, Department of Neurology, University Hospital Mútua de Terrassa, Fundació Docencia i Recerça Mútua de Terrassa, E08221 Terrassa, Spain; (I.Á.); (P.P.)
| | - Pau Pastor
- Movement Disorders Unit, Department of Neurology, University Hospital Mútua de Terrassa, Fundació Docencia i Recerça Mútua de Terrassa, E08221 Terrassa, Spain; (I.Á.); (P.P.)
| | - José A. G. Agúndez
- ARADyAL Instituto de Salud Carlos III, University Institute of Molecular Pathology Biomarkers, University of Extremadura, E10071 Caceres, Spain; (E.G.-M.); (J.A.G.A.)
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24
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Mekić S, Gunn DA, Jacobs LC, Hijnen D, Ikram MA, Mayes AE, Nijsten T, Pardo LM. Genetic Susceptibility to Dry Skin in a General Middle-Aged to Elderly Population: A GWAS. J Invest Dermatol 2021; 141:2077-2079.e5. [PMID: 33640410 DOI: 10.1016/j.jid.2020.12.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 12/29/2020] [Accepted: 12/30/2020] [Indexed: 12/01/2022]
Affiliation(s)
- Selma Mekić
- Department of Dermatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - David A Gunn
- Unilever Research and Development, Colworth Science Park, Sharnbrook, United Kingdom
| | - Leonie C Jacobs
- Department of Dermatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - DirkJan Hijnen
- Department of Dermatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - M Arfan Ikram
- Department of Epidemiology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Andrew E Mayes
- Unilever Research and Development, Colworth Science Park, Sharnbrook, United Kingdom
| | - Tamar Nijsten
- Department of Dermatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands.
| | - Luba M Pardo
- Department of Dermatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
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25
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Pan MK, Li YS, Wong SB, Ni CL, Wang YM, Liu WC, Lu LY, Lee JC, Cortes EP, Vonsattel JPG, Sun Q, Louis ED, Faust PL, Kuo SH. Cerebellar oscillations driven by synaptic pruning deficits of cerebellar climbing fibers contribute to tremor pathophysiology. Sci Transl Med 2021; 12:12/526/eaay1769. [PMID: 31941824 DOI: 10.1126/scitranslmed.aay1769] [Citation(s) in RCA: 77] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Accepted: 11/15/2019] [Indexed: 12/13/2022]
Abstract
Essential tremor (ET) is one of the most common movement disorders and the prototypical disorder for abnormal rhythmic movements. However, the pathophysiology of tremor generation in ET remains unclear. Here, we used autoptic cerebral tissue from patients with ET, clinical data, and mouse models to report that synaptic pruning deficits of climbing fiber (CF)-to-Purkinje cell (PC) synapses, which are related to glutamate receptor delta 2 (GluRδ2) protein insufficiency, cause excessive cerebellar oscillations and might be responsible for tremor. The CF-PC synaptic pruning deficits were correlated with the reduction in GluRδ2 expression in the postmortem ET cerebellum. Mice with GluRδ2 insufficiency and CF-PC synaptic pruning deficits develop ET-like tremor that can be suppressed with viral rescue of GluRδ2 protein. Step-by-step optogenetic or pharmacological inhibition of neuronal firing, axonal activity, or synaptic vesicle release confirmed that the activity of the excessive CF-to-PC synapses is required for tremor generation. In vivo electrophysiology in mice showed that excessive cerebellar oscillatory activity is CF dependent and necessary for tremor and optogenetic-driven PC synchronization was sufficient to generate tremor in wild-type animals. Human validation by cerebellar electroencephalography confirmed that excessive cerebellar oscillations also exist in patients with ET. Our findings identify a pathophysiologic contribution to tremor at molecular (GluRδ2), structural (CF-to-PC synapses), physiological (cerebellar oscillations), and behavioral levels (kinetic tremor) that might have clinical applications for treating ET.
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Affiliation(s)
- Ming-Kai Pan
- Department of Medical Research, National Taiwan University Hospital, Taipei City 10002, Taiwan. .,Institute of Pharmacology, College of Medicine, National Taiwan University Hospital, Taipei City 10051, Taiwan.,Neurobiology and Cognitive Science Center, National Taiwan University, Taipei City 10051, Taiwan.,Molecular Imaging Center, National Taiwan University, Taipei City 10051, Taiwan.,Department of Neurology, National Taiwan University Hospital, Yun-Lin Branch, Yun-Lin 64041, Taiwan
| | - Yong-Shi Li
- Department of Neurology, Columbia University, New York, NY 10032, USA
| | - Shi-Bing Wong
- Department of Neurology, Columbia University, New York, NY 10032, USA.,Department of Pediatrics, Taipei Tzu Chi Hospital, Tzu Chi Medical Foundation, New Taipei City 23142, Taiwan
| | - Chun-Lun Ni
- Department of Neurology, Columbia University, New York, NY 10032, USA
| | - Yi-Mei Wang
- Department of Neurology, National Taiwan University Hospital, Yun-Lin Branch, Yun-Lin 64041, Taiwan
| | - Wen-Chuan Liu
- Department of Medical Research, National Taiwan University Hospital, Taipei City 10002, Taiwan.,Institute of Pharmacology, College of Medicine, National Taiwan University Hospital, Taipei City 10051, Taiwan
| | - Liang-Yin Lu
- Neurobiology and Cognitive Science Center, National Taiwan University, Taipei City 10051, Taiwan
| | - Jye-Chang Lee
- Molecular Imaging Center, National Taiwan University, Taipei City 10051, Taiwan
| | - Etty P Cortes
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Jean-Paul G Vonsattel
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Qian Sun
- Department of Neuroscience, Columbia University, New York, NY 10032, USA.,Department of Neurosciences, Case Western Reserve University, Cleveland, OH 44016, USA
| | - Elan D Louis
- Department of Neurology, Yale School of Medicine, Yale University, New Haven, CT 06519, USA.,Department of Chronic Disease Epidemiology, Yale School of Public Health, Yale University, New Haven, CT 06510, USA
| | - Phyllis L Faust
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Sheng-Han Kuo
- Department of Neurology, Columbia University, New York, NY 10032, USA. .,Initiative of Columbia Ataxia and Tremor, New York, NY 10032, USA
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26
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Diez-Fairen M, Houle G, Ortega-Cubero S, Bandres-Ciga S, Alvarez I, Carcel M, Ibañez L, Fernandez MV, Budde JP, Trotta JR, Tonda R, Chong JX, Bamshad MJ, Nickerson DA, Aguilar M, Tartari JP, Gironell A, García-Martín E, Agundez JA, Alonso-Navarro H, Jimenez-Jimenez FJ, Fernandez M, Valldeoriola F, Marti MJ, Tolosa E, Coria F, Pastor MA, Vilariño-Güell C, Rajput A, Dion PA, Cruchaga C, Rouleau GA, Pastor P. Exome-wide rare variant analysis in familial essential tremor. Parkinsonism Relat Disord 2020; 82:109-116. [PMID: 33279834 DOI: 10.1016/j.parkreldis.2020.11.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 10/08/2020] [Accepted: 11/21/2020] [Indexed: 01/10/2023]
Abstract
INTRODUCTION Essential tremor (ET) is one of the most common movement disorders. Despite its high prevalence and heritability, its genetic etiology remains elusive with only a few susceptibility genes identified and poorly replicated. Our aim was to find novel candidate genes involved in ET predisposition through whole exome sequencing. METHODS We studied eight multigenerational families (N = 40 individuals) with an autosomal-dominant inheritance using a comprehensive strategy combining whole exome sequencing followed by case-control association testing of prioritized variants in a separate cohort comprising 521 ET cases and 596 controls. We further performed gene-based burden analyses in an additional dataset comprising 789 ET patients and 770 healthy individuals to investigate whether there was an enrichment of rare deleterious variants within our candidate genes. RESULTS Fifteen variants co-segregated with disease status in at least one of the families, among which rs749875462 in CCDC183, rs535864157 in MMP10 and rs114285050 in GPR151 showed a nominal association with ET. However, we found no significant enrichment of rare variants within these genes in cases compared with controls. Interestingly, MMP10 protein is involved in the inflammatory response to neuronal damage and has been previously associated with other neurological disorders. CONCLUSIONS We prioritized a set of promising genes, especially MMP10, for further genetic and functional studies in ET. Our study suggests that rare deleterious coding variants that markedly increase susceptibility to ET are likely to be found in many genes. Future studies are needed to replicate and further infer biological mechanisms and potential disease causality for our identified genes.
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Affiliation(s)
- Monica Diez-Fairen
- Fundació Docència i Recerca MútuaTerrassa, Movement Disorders Unit, Department of Neurology, University Hospital Mútua Terrassa, Terrassa, Barcelona, Spain
| | - Gabrielle Houle
- Department of Human Genetics, McGill University, Montréal, Quebec, Canada; Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada
| | - Sara Ortega-Cubero
- Department of Neurology and Neurosurgery, Hospital Universitario de Burgos, Burgos, Spain
| | - Sara Bandres-Ciga
- Molecular Genetics Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD, USA; Instituto de Investigación Biosanitaria de Granada (ibs. GRANADA), Granada, Spain
| | - Ignacio Alvarez
- Fundació Docència i Recerca MútuaTerrassa, Movement Disorders Unit, Department of Neurology, University Hospital Mútua Terrassa, Terrassa, Barcelona, Spain
| | - Maria Carcel
- Fundació Docència i Recerca MútuaTerrassa, Movement Disorders Unit, Department of Neurology, University Hospital Mútua Terrassa, Terrassa, Barcelona, Spain
| | - Laura Ibañez
- NeuroGenomics and Informatics, Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA
| | - Maria Victoria Fernandez
- NeuroGenomics and Informatics, Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA
| | - John P Budde
- NeuroGenomics and Informatics, Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA
| | - Jean-Rémi Trotta
- Centre Nacional d'Anàlisis Genòmic (CNAG-CRG), Center for Genomic Regulation, Barcelona Institute of Science and Technology (BIST), Barcelona, Spain & Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Raúl Tonda
- Centre Nacional d'Anàlisis Genòmic (CNAG-CRG), Center for Genomic Regulation, Barcelona Institute of Science and Technology (BIST), Barcelona, Spain & Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Jessica X Chong
- Division of Genetic Medicine, Department of Pediatrics, University of Washington, Seattle, WA, USA
| | - Michael J Bamshad
- Division of Genetic Medicine, Department of Pediatrics, University of Washington, Seattle, WA, USA; Seattle Children's Hospital, Seattle, WA, 98105, USA; Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | | | | | - Miquel Aguilar
- Fundació Docència i Recerca MútuaTerrassa, Movement Disorders Unit, Department of Neurology, University Hospital Mútua Terrassa, Terrassa, Barcelona, Spain
| | - Juan P Tartari
- Fundació Docència i Recerca MútuaTerrassa, Movement Disorders Unit, Department of Neurology, University Hospital Mútua Terrassa, Terrassa, Barcelona, Spain
| | - Alexandre Gironell
- Movement Disorders Unit, Neurology Department, Hospital de Sant Pau and Sant Pau Biomedical Research Institute, Barcelona, 08026, Spain
| | - Elena García-Martín
- University Institute of Molecular Pathology Biomarkers, UNEx. ARADyAL Instituto de Salud Carlos III, Cáceres, Spain
| | - Jose Ag Agundez
- University Institute of Molecular Pathology Biomarkers, UNEx. ARADyAL Instituto de Salud Carlos III, Cáceres, Spain
| | | | | | - Manel Fernandez
- María de Maeztu Unit of Excellence, Institute of Neurosciences, University of Barcelona, MDM-2017-0729, Ministry of Science, Innovation and Universities, Spain; Parkinson's Disease & Movement Disorders Unit, Department of Neurology, Hospital Clínic, IDIBAPS, Barcelona, Spain
| | - Francesc Valldeoriola
- Parkinson's Disease & Movement Disorders Unit, Department of Neurology, Hospital Clínic, IDIBAPS, Barcelona, Spain; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Hospital Clínic de Barcelona, Barcelona, Spain
| | - Maria Jose Marti
- Parkinson's Disease & Movement Disorders Unit, Department of Neurology, Hospital Clínic, IDIBAPS, Barcelona, Spain; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Hospital Clínic de Barcelona, Barcelona, Spain
| | - Eduard Tolosa
- Parkinson's Disease & Movement Disorders Unit, Department of Neurology, Hospital Clínic, IDIBAPS, Barcelona, Spain; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Hospital Clínic de Barcelona, Barcelona, Spain
| | - Francisco Coria
- Clinic for Nervous Disorders, Service of Neurology, Son Espases University Hospital, Palma de Mallorca, Spain
| | - Maria A Pastor
- Department of Neurology, Clínica Universidad de Navarra, Pamplona, Spain
| | - Carles Vilariño-Güell
- Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
| | - Alex Rajput
- Saskatchewan Movement Disorders Program, University of Saskatchewan/Saskatchewan Health Authority, Saskatoon, Saskatchewan, Canada
| | - Patrick A Dion
- Department of Human Genetics, McGill University, Montréal, Quebec, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, H3A 2B4, Quebec, Canada
| | - Carlos Cruchaga
- NeuroGenomics and Informatics, Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA
| | - Guy A Rouleau
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, H3A 2B4, Quebec, Canada
| | - Pau Pastor
- Fundació Docència i Recerca MútuaTerrassa, Movement Disorders Unit, Department of Neurology, University Hospital Mútua Terrassa, Terrassa, Barcelona, Spain.
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27
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Ibrahim MF, Beevis JC, Empson RM. Essential Tremor - A Cerebellar Driven Disorder? Neuroscience 2020; 462:262-273. [PMID: 33212218 DOI: 10.1016/j.neuroscience.2020.11.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 10/23/2020] [Accepted: 11/01/2020] [Indexed: 02/07/2023]
Abstract
Abnormal tremors are the most common of all movement disorders. In this review we focus on the role of the cerebellum in Essential Tremor, a highly debilitating but poorly treated movement disorder. We propose a variety of mechanisms driving abnormal burst firing of deep cerebellar nuclei neurons as a key initiator of tremorgenesis in Essential Tremor. Targetting these mechanisms may generate more effective treatments for Essential Tremor.
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Affiliation(s)
- Mohamed Fasil Ibrahim
- Department of Physiology, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand.
| | - Jessica C Beevis
- Department of Physiology, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand
| | - Ruth M Empson
- Department of Physiology, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand
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28
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Yang HL, Jiang L, Pan HX, Xu K, Zhao YW, Liu ZH, Xu Q, Sun QY, Tan JQ, Li JC, Tang BS, Guo JF. Assessment of the association between NUS1 variants and essential tremor. Neurosci Lett 2020; 740:135441. [PMID: 33184037 DOI: 10.1016/j.neulet.2020.135441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 09/28/2020] [Accepted: 10/10/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND A recent study on early onset Parkinson's disease (PD) revealed that NUS1 is a risk gene for PD. Clinically, essential tremor (ET) is closely related to PD. In this study, we aimed to detect NUS1 variants and assess the effect of those variants on patients with ET. METHODS The 5 coding regions and the exon-intron boundaries of NUS1 were directly sequenced in 395 patients with ET and an equal number of healthy controls, matched for age and sex. The function of variants was assessed by pathogenic predictive software programs. Genetic analysis of variants was used to evaluate susceptibility to ET. RESULTS A total of 6 exonic variants were identified, including 3 synonymous and 3 missense variants. The non-synonymous variants were predicted to be tolerable. No variants had significant association with ET (none of the p-values were less than 0.05, using Fisher's exact test). CONCLUSION Our study suggested that NUS1 variants may not contribute to the risk of ET.
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Affiliation(s)
- Hong-Lan Yang
- Department of Neurology, Xiangya Hospital, Central South University, 410008, Changsha, Hunan, China
| | - Li Jiang
- Department of Neurology, Xiangya Hospital, Central South University, 410008, Changsha, Hunan, China
| | - Hong-Xu Pan
- Department of Neurology, Xiangya Hospital, Central South University, 410008, Changsha, Hunan, China
| | - Ke Xu
- Department of Neurology, Xiangya Hospital, Central South University, 410008, Changsha, Hunan, China
| | - Yu-Wen Zhao
- Department of Neurology, Xiangya Hospital, Central South University, 410008, Changsha, Hunan, China
| | - Zhen-Hua Liu
- Department of Neurology, Xiangya Hospital, Central South University, 410008, Changsha, Hunan, China
| | - Qian Xu
- Department of Neurology, Xiangya Hospital, Central South University, 410008, Changsha, Hunan, China
| | - Qi-Ying Sun
- Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Jie-Qiong Tan
- Center for Medical Genetics, School of Life Sciences, Central South University, 410078 Changsha, China
| | - Jin-Chen Li
- National Clinical Research Center for Geriatric Disorders, Central South University, 410008 Changsha, Hunan, China
| | - Bei-Sha Tang
- Department of Neurology, Xiangya Hospital, Central South University, 410008, Changsha, Hunan, China; Center for Medical Genetics, School of Life Sciences, Central South University, 410078 Changsha, China; National Clinical Research Center for Geriatric Disorders, Central South University, 410008 Changsha, Hunan, China; Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, 410008, Changsha, Hunan, China
| | - Ji-Feng Guo
- Department of Neurology, Xiangya Hospital, Central South University, 410008, Changsha, Hunan, China; Center for Medical Genetics, School of Life Sciences, Central South University, 410078 Changsha, China; National Clinical Research Center for Geriatric Disorders, Central South University, 410008 Changsha, Hunan, China; Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, 410008, Changsha, Hunan, China.
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29
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Sailani MR, Jahanbani F, Abbott CW, Lee H, Zia A, Rego S, Winkelmann J, Hopfner F, Khan TN, Katsanis N, Müller SH, Berg D, Lyman KM, Mychajliw C, Deuschl G, Bernstein JA, Kuhlenbäumer G, Snyder MP. Candidate variants in TUB are associated with familial tremor. PLoS Genet 2020; 16:e1009010. [PMID: 32956375 PMCID: PMC7529431 DOI: 10.1371/journal.pgen.1009010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 10/01/2020] [Accepted: 07/24/2020] [Indexed: 11/19/2022] Open
Abstract
Essential tremor (ET) is the most common adult-onset movement disorder. In the present study, we performed whole exome sequencing of a large ET-affected family (10 affected and 6 un-affected family members) and identified a TUB p.V431I variant (rs75594955) segregating in a manner consistent with autosomal-dominant inheritance. Subsequent targeted re-sequencing of TUB in 820 unrelated individuals with sporadic ET and 630 controls revealed significant enrichment of rare nonsynonymous TUB variants (e.g. rs75594955: p.V431I, rs1241709665: p.Ile20Phe, rs55648406: p.Arg49Gln) in the ET cohort (SKAT-O test p-value = 6.20e-08). TUB encodes a transcription factor predominantly expressed in neuronal cells and has been previously implicated in obesity. ChIP-seq analyses of the TUB transcription factor across different regions of the mouse brain revealed that TUB regulates the pathways responsible for neurotransmitter production as well thyroid hormone signaling. Together, these results support the association of rare variants in TUB with ET. Essential tremor (ET) is the most common adult-onset movement disorder and in most affected families it appears to be inherited in an autosomal dominant pattern. The causes of essential tremor are unknown. Although many genetic studies in affected families and sporadic cases of ET have shown that genes may play a role, it has proven quite challenging to identify the specific genetic variants involved. Here, we use state-of-the-art technologies to identify the role of genetic variants on ET through exome sequencing of a large affected ET family and subsequent validation in a large population of cases and controls. We show that rare nonsynonymous variants of the TUB gene are significantly enriched in ET cases versus healthy controls. Further studies of biological pathways regulated by TUB in the mouse brain reveal key pathways related to ET. Our work expands our knowledge of the genetic basis of ET.
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Affiliation(s)
- M. Reza Sailani
- Department of Genetics, Stanford University, Stanford, CA, United States of America
| | - Fereshteh Jahanbani
- Department of Genetics, Stanford University, Stanford, CA, United States of America
| | - Charles W. Abbott
- Department of Genetics, Stanford University, Stanford, CA, United States of America
| | - Hayan Lee
- Department of Genetics, Stanford University, Stanford, CA, United States of America
| | - Amin Zia
- Department of Genetics, Stanford University, Stanford, CA, United States of America
| | - Shannon Rego
- Department of Genetics, Stanford University, Stanford, CA, United States of America
| | - Juliane Winkelmann
- Institute of Neurogenomics, Helmholtz Zentrum München, Munich, Germany; Institute of Human Genetics, Technical University, Munich, Germany; Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Franziska Hopfner
- Department of Neurology, Kiel University, Germany
- Department of Neurology, Hannover Medical School, Hannover, Germany
| | - Tahir N. Khan
- Center for Human Disease Modeling, Duke University, United States of America
| | - Nicholas Katsanis
- Center for Human Disease Modeling, Duke University, United States of America
- Advanced Center for Translational and Genetic Medicine, Stanley Manne Children's Research Institute, Ann & Robert H. Lurie Children's Hospital, Chicago, IL, United States of America
- Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States of America
| | | | - Daniela Berg
- Department of Neurology, Kiel University, Germany
- Department of Neurology, Universitätsklinikum Tübingen, Germany
| | - Katherine M. Lyman
- Department of Genetics, Stanford University, Stanford, CA, United States of America
| | - Christian Mychajliw
- University Hospital Tübingen, Department of Psychiatry and Psychotherapy, Tübingen, Germany
| | | | - Jonathan A. Bernstein
- Department of Pediatrics, Stanford University, Stanford, CA, United States of America
| | | | - Michael P. Snyder
- Department of Genetics, Stanford University, Stanford, CA, United States of America
- * E-mail: (GK); (MPS)
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30
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Magrinelli F, Latorre A, Balint B, Mackenzie M, Mulroy E, Stamelou M, Tinazzi M, Bhatia KP. Isolated and combined genetic tremor syndromes: a critical appraisal based on the 2018 MDS criteria. Parkinsonism Relat Disord 2020; 77:121-140. [PMID: 32818815 DOI: 10.1016/j.parkreldis.2020.04.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 04/13/2020] [Accepted: 04/18/2020] [Indexed: 12/12/2022]
Abstract
The 2018 consensus statement on the classification of tremors proposes a two-axis categorization scheme based on clinical features and etiology. It also defines "isolated" and "combined" tremor syndromes depending on whether tremor is the sole clinical manifestation or is associated with other neurological or systemic signs. This syndromic approach provides a guide to investigate the underlying etiology of tremors, either genetic or acquired. Several genetic defects have been proven to cause tremor disorders, including autosomal dominant and recessive, X-linked, and mitochondrial diseases, as well as chromosomal abnormalities. Furthermore, some tremor syndromes are recognized in individuals with a positive family history, but their genetic confirmation is pending. Although most genetic tremor disorders show a combined clinical picture, there are some distinctive conditions in which tremor may precede the appearance of other neurological signs by years or remain the prominent manifestation throughout the disease course, previously leading to misdiagnosis as essential tremor (ET). Advances in the knowledge of genetically determined tremors may have been hampered by the inclusion of heterogeneous entities in previous studies on ET. The recent classification of tremors therefore aims to provide more consistent clinical data for deconstructing the genetic basis of tremor syndromes in the next-generation and long-read sequencing era. This review outlines the wide spectrum of tremor disorders with defined or presumed genetic etiology, both isolated and combined, unraveling diagnostic clues of these conditions and focusing mainly on ET-like phenotypes. Furthermore, we suggest a phenotype-to-genotype algorithm to support clinicians in identifying tremor syndromes and guiding genetic investigations.
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Affiliation(s)
- Francesca Magrinelli
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom; Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy.
| | - Anna Latorre
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom.
| | - Bettina Balint
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom; Department of Neurology, University Hospital Heidelberg, Heidelberg, Germany.
| | - Melissa Mackenzie
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom.
| | - Eoin Mulroy
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom.
| | - Maria Stamelou
- Department of Neurology, Attikon University Hospital, Athens, Greece.
| | - Michele Tinazzi
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy.
| | - Kailash P Bhatia
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom.
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Abstract
Highlights In the current review, we thoroughly reviewed 74 identified articles regarding genes and genetic loci that confer susceptibility to ET. Over 50 genes/genetic loci have been examined for possible association with ET, but consistent results failed to be reported raising the need for collaborative multiethnic studies. Background: Essential tremor (ET) is a common movement disorder, which is mainly characterized by bilateral tremor (postural and/or kinetic) in the upper limbs, with other parts of the body possibly involved. While the pathophysiology of ET is still unclear, there is accumulating evidence indicating that genetic variability may be heavily involved in ET pathogenesis. This review focuses on the role of genetic risk factors in ET susceptibility. Methods: The PubMed database was searched for articles written in English, for studies with humans with ET, controls without ET, and genetic variants. The terms “essential tremor” and “polymorphism” (as free words) were used during search. We also performed meta-analyses for the most examined genetic variants. Results: Seventy four articles concerning LINGO1, LINGO2, LINGO4, SLC1A2, STK32B, PPARGC1A, CTNNA3, DRD3, ALAD, VDR, HMOX1, HMOX2, LRRK1,LRRK2, GBA, SNCA, MAPT, FUS, CYPsIL17A, IL1B, NOS1, ADH1B, TREM2, RIT2, HNMT, MTHFR, PPP2R2B, GSTP1, PON1, GABA receptors and GABA transporter, HS1BP3, ADH2, hSKCa3 and CACNL1A4 genes, and ETM genetic loci were included in the current review. Results from meta-analyses revealed a marginal association for the STK32B rs10937625 and a marginal trend for association (in sensitivity analysis) for the LINGO1 rs9652490, with ET. Discussion: Quite a few variants have been examined for their possible association with ET. LINGO1 rs9652490 and STK32B rs10937625 appear to influence, to some extent, ET susceptibility. However, the conflicting results and the lack of replication for many candidate genes raise the need for collaborative multiethnic studies.
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Jiménez-Jiménez FJ, Alonso-Navarro H, García-Martín E, Agúndez JA. An Update on the Neurochemistry of Essential Tremor. Curr Med Chem 2020; 27:1690-1710. [DOI: 10.2174/0929867325666181112094330] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 09/03/2018] [Accepted: 11/05/2018] [Indexed: 12/21/2022]
Abstract
Background:
The pathophysiology and neurochemical mechanisms of essential
tremor (ET) are not fully understood, because only a few post-mortem studies have been reported,
and there is a lack of good experimental model for this disease.
Objective:
The main aim of this review is to update data regarding the neurochemical features
of ET. Alterations of certain catecholamine systems, the dopaminergic, serotonergic,
GABAergic, noradrenergic, and adrenergic systems have been described, and are the object of
this revision.
Methods:
For this purpose, we performed a literature review on alterations of the neurotransmitter
or neuromodulator systems (catecholamines, gammaaminobutyric acid or GABA,
excitatory amino acids, adenosine, T-type calcium channels) in ET patients (both post-mortem
or in vivo) or in experimental models resembling ET.
Results and Conclusion:
The most consistent data regarding neurochemistry of ET are related
with the GABAergic and glutamatergic systems, with a lesser contribution of adenosine
and dopaminergic and adrenergic systems, while there is not enough evidence of a definite
role of other neurotransmitter systems in ET. The improvement of harmaline-induced tremor
in rodent models achieved with T-type calcium channel antagonists, cannabinoid 1 receptor,
sphingosine-1-phosphate receptor agonists, and gap-junction blockers, suggests a potential
role of these structures in the pathogenesis of ET.
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Affiliation(s)
| | | | - Elena García-Martín
- University Institute of Molecular Pathology Biomarkers, UNEx. ARADyAL Instituto de Salud Carlos III, Caceres, Spain
| | - José A.G. Agúndez
- University Institute of Molecular Pathology Biomarkers, UNEx. ARADyAL Instituto de Salud Carlos III, Caceres, Spain
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Yan YP, Xu CY, Gu LY, Zhang B, Shen T, Gao T, Tian J, Pu JL, Yin XZ, Zhang BR, Zhao GH. Genetic testing of FUS, HTRA2, and TENM4 genes in Chinese patients with essential tremor. CNS Neurosci Ther 2020; 26:837-841. [PMID: 32196977 PMCID: PMC7366735 DOI: 10.1111/cns.13305] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Revised: 03/04/2020] [Accepted: 03/05/2020] [Indexed: 12/11/2022] Open
Abstract
Introduction Essential tremor (ET) is one of the most prevalent movement disorders. The genetic etiology of ET has not been well defined although a significant proportion (≥50%) are familial cases. Linkage analysis and genome‐wide association studies (GWASs) have identified several risk variants. In recent years, whole‐exome sequencing of ET has revealed several specific causal variants in FUS (p.Q290X), HTRA2 (p.G399S), and TENM4 (c.4324 G>A, c.4100C>A, and c.3412G>A) genes. Objective To investigate the genetic contribution of these three genes to ET, the protein‐coding sequences of FUS, HTRA2, and TENM4 were analyzed in a total of 238 ET patients and 272 controls from eastern China using direct Sanger sequencing. Results We identified two synonymous coding single nucleotide polymorphisms (SNPs), rs741810 and rs1052352 in FUS, and three previously reported synonymous SNPs, rs11237621, rs689369, and rs2277277 in TENM4. No nonsynonymous exonic variants were identified in these subjects. We found that the frequency of the rs1052352C allele was significantly higher (P = .001) in the ET group than in the control group. Conclusion Overall, our findings suggest that rs1052352 of FUS might contribute to ET risk in Chinese population.
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Affiliation(s)
- Ya-Ping Yan
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Cong-Ying Xu
- Department of Neurology, The Second Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Lu-Yan Gu
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Bo Zhang
- Department of Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Ting Shen
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Ting Gao
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jun Tian
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jia-Li Pu
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xin-Zhen Yin
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Bao-Rong Zhang
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Guo-Hua Zhao
- Department of Neurology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Neurology, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
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Essential tremor pathology: neurodegeneration and reorganization of neuronal connections. Nat Rev Neurol 2020; 16:69-83. [PMID: 31959938 DOI: 10.1038/s41582-019-0302-1] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/10/2019] [Indexed: 01/26/2023]
Abstract
Essential tremor (ET) is the most common tremor disorder globally and is characterized by kinetic tremor of the upper limbs, although other clinical features can also occur. Postmortem studies are a particularly important avenue for advancing our understanding of the pathogenesis of ET; however, until recently, the number of such studies has been limited. Several recent postmortem studies have made important contributions to our understanding of the pathological changes that take place in ET. These studies identified abnormalities in the cerebellum, which primarily affected Purkinje cells (PCs), basket cells and climbing fibres, in individuals with ET. We suggest that some of these pathological changes (for example, focal PC axonal swellings, swellings in and regression of the PC dendritic arbor and PC death) are likely to be primary and degenerative. By contrast, other changes, such as an increase in PC recurrent axonal collateral formation and hypertrophy of GABAergic basket cell axonal processes, could be compensatory responses to restore cerebellar GABAergic tone and cerebellar cortical inhibitory efficacy. Such compensatory responses are likely to be insufficient, enabling the disease to progress. Here, we review the results of recent postmortem studies of ET and attempt to place these findings into an anatomical-physiological disease model.
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Abstract
Tremor and myoclonus are two common hyperkinetic movement disorders. Tremor is characterized by rhythmic oscillatory movements while myoclonic jerks are usually arrhythmic. Tremor can be classified into subtypes including the most common types: essential, enhanced physiological, and parkinsonian tremor. Myoclonus classification is based on its anatomic origin: cortical, subcortical, spinal, and peripheral myoclonus. The clinical presentations are unfortunately not always classic and electrophysiologic investigations can be helpful in making a phenotypic diagnosis. Video-polymyography is the main technique to (sub)classify the involuntary movements. In myoclonus, advanced electrophysiologic testing, such as back-averaging, coherence analysis, somatosensory-evoked potentials, and the C-reflex can be of additional value. Recent developments in tremor point toward a role for intermuscular coherence analysis to differentiate between tremor subtypes. Classification of the movement disorder based on clinical and electrophysiologic features is important, as it enables the search for an etiological diagnosis and guides tailored treatment.
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Affiliation(s)
- R Zutt
- Department of Neurology, University Medical Center Groningen, Groningen, The Netherlands
| | - J W Elting
- Department of Neurology, University Medical Center Groningen, Groningen, The Netherlands
| | - M A J Tijssen
- Department of Neurology, University Medical Center Groningen, Groningen, The Netherlands.
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36
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Abstract
Essential tremor (ET) is a neurological movement disorder characterised by bilateral limb kinetic/postural tremor, with or without tremor in other body parts including head, voice and lower limbs. Since no causative genes for ET have been identified, it is likely that the disorder occurs as a result of complex genetic factors interacting with various cellular and environmental factors that can result in abnormal function of circuitry involving the cerebello-thalamo-cortical pathway. Genetic analyses have uncovered at least 14 loci and 11 genes that are related to ET, as well as various risk or protective genetic factors. Limitations in ET genetic analyses include inconsistent disease definition, small sample size, varied ethnic backgrounds and many other factors that may contribute to paucity of relevant genetic data in ET. Genetic analyses, coupled with functional and animal studies, have led to better insights into possible pathogenic mechanisms underlying ET. These genetic studies may guide the future development of genetic testing and counselling, and specific, pathogenesis-targeted, therapeutic strategies.
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Sun QY, Xu Q, Tian Y, Hu ZM, Qin LX, Yang JX, Huang W, Xue J, Li JC, Zeng S, Wang Y, Min HX, Chen XY, Wang JP, Xie B, Liang F, Zhang HN, Wang CY, Lei LF, Yan XX, Xu HW, Duan RH, Xia K, Liu JY, Jiang H, Shen L, Guo JF, Tang BS. Expansion of GGC repeat in the human-specific NOTCH2NLC gene is associated with essential tremor. Brain 2019; 143:222-233. [PMID: 31819945 DOI: 10.1093/brain/awz372] [Citation(s) in RCA: 135] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Revised: 09/06/2019] [Accepted: 10/04/2019] [Indexed: 12/22/2022] Open
Abstract
Abstract
Essential tremor is one of the most common movement disorders. Despite its high prevalence and heritability, the genetic aetiology of essential tremor remains elusive. Up to now, only a few genes/loci have been identified, but these genes have not been replicated in other essential tremor families or cohorts. Here we report a genetic study in a cohort of 197 Chinese pedigrees clinically diagnosed with essential tremor. Using a comprehensive strategy combining linkage analysis, whole-exome sequencing, long-read whole-genome sequencing, repeat-primed polymerase chain reaction and GC-rich polymerase chain reaction, we identified an abnormal GGC repeat expansion in the 5′ region of the NOTCH2NLC gene that co-segregated with disease in 11 essential tremor families (5.58%) from our cohort. Clinically, probands that had an abnormal GGC repeat expansion were found to have more severe tremor phenotypes, lower activities of daily living ability. Obvious genetic anticipation was also detected in these 11 essential tremor-positive families. These results indicate that abnormal GGC repeat expansion in the 5′ region of NOTCH2NLC gene is associated with essential tremor, and provide strong evidence that essential tremor is a family of diseases with high clinical and genetic heterogeneities.
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Affiliation(s)
- Qi-Ying Sun
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
- Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Qian Xu
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Yun Tian
- Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Zheng-Mao Hu
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, China
- Hunan Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, China
| | - Li-Xia Qin
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jin-Xia Yang
- Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Wen Huang
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, China
| | - Jin Xue
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, China
| | - Jin-Chen Li
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Sheng Zeng
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Ying Wang
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | | | - Xiao-Yu Chen
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jun-Pu Wang
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Bin Xie
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Fan Liang
- GrandOmics Biosciences, Beijing, China
| | - Hai-Nan Zhang
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Chun-Yu Wang
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Li-Fang Lei
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Xin-Xiang Yan
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Hong-Wei Xu
- Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Ran-Hui Duan
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, China
- Hunan Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, China
| | - Kun Xia
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan, China
- Hunan Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, China
| | - Jing-Yu Liu
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Center for Human Genome Research, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan, China
| | - Hong Jiang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, China
| | - Lu Shen
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Ji-Feng Guo
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Bei-Sha Tang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
- Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, Hunan, China
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Gao T, Wu J, Zheng R, Fang Y, Jin CY, Ruan Y, Cao J, Tian J, Pu JL, Zhang BR. Assessment of three essential tremor genetic loci in sporadic Parkinson's disease in Eastern China. CNS Neurosci Ther 2019; 26:448-452. [PMID: 31755235 PMCID: PMC7080431 DOI: 10.1111/cns.13272] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 11/03/2019] [Accepted: 11/07/2019] [Indexed: 12/13/2022] Open
Abstract
Objective The aim of this study was to investigate potential genetic overlap between essential tremor and Parkinson's disease in a cohort of 825 subjects from an Eastern Chinese population. Methods A total of 441 Parkinson's disease patients and 384 healthy controls were recruited. The MassARRAY System was used to detect three essential tremor‐related single nucleotide polymorphisms. Odds ratio (OR) and 95% confidential interval (CI) were calculated to assess the relationship between polymorphisms and Parkinson's disease susceptibility. Results Our results demonstrated that the odds ratios of rs3794087 of SLC1A2, rs9652490 of LINGO1, and rs17590046 of PPARGC1A were 0.71 (95% CI = 0.55‐0.91), 0.99 (95% CI = 0.78‐1.26), and 0.88 (95% CI = 0.62‐1.25), respectively. Conclusion An essential tremor SNP (rs3794087 of SLC1A2) is associated with a decreased risk of PD in the Eastern Han Chinese population, while rs9652490 (LINGO1) and rs17590046 (PPARGC1A) do not show an association.
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Affiliation(s)
- Ting Gao
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Jiong Wu
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Ran Zheng
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Yi Fang
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Chong-Yao Jin
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Yang Ruan
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Jin Cao
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Jun Tian
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Jia-Li Pu
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Bao-Rong Zhang
- Department of Neurology, College of Medicine, Second Affiliated Hospital, Zhejiang University, Hangzhou, China
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Chen J, Huang P, He Y, Shen J, Du J, Cui S, Chen S, Ma J. IL1B polymorphism is associated with essential tremor in Chinese population. BMC Neurol 2019; 19:99. [PMID: 31092216 PMCID: PMC6518722 DOI: 10.1186/s12883-019-1331-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Accepted: 05/08/2019] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND The aim of the study was to investigate the genetic risk factors of essential tremor (ET) in Chinese Population. METHODS A total of 225 ET patients (25 ET patients also had restless legs syndrome (RLS) and were excluded from final analysis) and 229 controls were recruited. The diagnosis of ET was based on the Consensus Statement of the Movement Disorders Society on tremor. Polymerase chain reaction (PCR) and sequencing were used to detect 12 single nucleotide polymorphisms (SNPs) in seven candidate genes for RLS (HMOX1, HMOX2, VDR, IL17A, IL1B, NOS1 and ADH1B). RESULTS We found that one SNP was associated with the risk of ET in Chinese population after adjusting for age and gender: rs1143633 of IL1B (odds ratio [OR] =2.57, p = 0.003, recessive model), and the statistical result remained significant after Bonferroni correction. Then, we performed a query in Genotype-tissue Expression (GTEx), Brain eQTL Almanac (Braineac) databases and Blood expression quantitative trait loci (eQTL) browser. The significant association was only found between genotype at rs1143633 and IL1B expression level of putamen and white matter in Braineac database, which was more prominent with homozygous (GG) carriers. CONCLUSIONS Our study firstly reported the association of IL1B polymorphism with the risk of ET in Chinese population. However, the association might only suggest a marker of IL1B SNP associated with ET instead of the casual variant. Further studies are needed to confirm our finding.
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Affiliation(s)
- Jie Chen
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Pei Huang
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Yachao He
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Junyi Shen
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Juanjuan Du
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Shishuang Cui
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China
| | - Shengdi Chen
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China.
| | - Jianfang Ma
- Department of Neurology & Co-innovation Center of Neuroregeneration, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200025, China.
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Diez-Fairen M, Bandres-Ciga S, Houle G, Nalls MA, Girard SL, Dion PA, Blauwendraat C, Singleton AB, Rouleau GA, Pastor P. Genome-wide estimates of heritability and genetic correlations in essential tremor. Parkinsonism Relat Disord 2019; 64:262-267. [PMID: 31085086 DOI: 10.1016/j.parkreldis.2019.05.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 04/30/2019] [Accepted: 05/01/2019] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Despite considerable efforts to identify disease-causing and risk factors contributing to essential tremor (ET), no comprehensive assessment of heritable risk has been performed to date. METHODS We use GREML-LDMS to estimate narrow-sense heritability due to additive effects (h2) and GREMLd to calculate non-additive heritability due to dominance variance (δ2) using data from 1,751 ET cases and 5,311 controls. We evaluate heritability per 10 Mb segments across the genome and assess the impact of Parkinson's disease (PD) misdiagnosis on heritability estimates. We apply genetic risk score (GRS) from PD and restless legs syndrome (RLS) to explore its contribution to ET risk and further assess genetic correlations with 832 traits by Linkage disequilibrium score regression. RESULTS We estimated ET narrow-sense heritability to be h2 = 75.5% (s.e = ±0.075). In contrast, dominance variance showed insignificant effect on the overall estimates. Heritability split by 10 Mb regions revealed increased estimates at chromosomes 6 and 21. The proportion of genetic variance due to PD misdiagnosed cases was estimated to be 5.33%. PD and RLS GRS were not significantly predictive of ET case-control status. CONCLUSIONS We show for the first time that ET is a highly heritable condition in which additive common variability plays a prominent role. Chromosomes 6 and 21 may contain causative risk variants influencing susceptibility to ET. Despite overlapping symptomatology, ET does not seem to share genetic etiologies with PD or RLS. Our study suggests that most of ET genetic component is yet to be discovered and future GWAS will reveal additional risk factors contributing to ET.
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Affiliation(s)
- Monica Diez-Fairen
- Fundació Docència i Recerca Mútua Terrassa, University Hospital Mútua de Terrassa, Terrassa, 08221, Barcelona, Spain; Movement Disorders Unit, Department of Neurology, University Hospital Mútua de Terrassa, Terrassa, 08222, Barcelona, Spain
| | - Sara Bandres-Ciga
- Molecular Genetics Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, 20892, MD, USA; Instituto de Investigación Biosanitaria de Granada (ibs.GRANADA), Granada, 18016, Spain
| | - Gabrielle Houle
- Department of Human Genetics, McGill University, Montréal, H3A 2B4, Quebec, Canada; Montreal Neurological Institute, McGill University, Montréal, H3A 2B4, Quebec, Canada
| | - Mike A Nalls
- Molecular Genetics Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, 20892, MD, USA; Data Tecnica International, Glen Echo, 20892, Bethesda, MD, USA
| | - Simon L Girard
- Centre Intersectoriel en Santé Durable, Université du Québec, Chicoutimi, G7H 2B1, Quebec, Canada
| | - Patrick A Dion
- Department of Human Genetics, McGill University, Montréal, H3A 2B4, Quebec, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, H3A 2B4, Quebec, Canada
| | - Cornelis Blauwendraat
- Molecular Genetics Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, 20892, MD, USA
| | - Andrew B Singleton
- Molecular Genetics Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, 20892, MD, USA
| | - Guy A Rouleau
- Montreal Neurological Institute, McGill University, Montréal, H3A 2B4, Quebec, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, H3A 2B4, Quebec, Canada
| | - Pau Pastor
- Fundació Docència i Recerca Mútua Terrassa, University Hospital Mútua de Terrassa, Terrassa, 08221, Barcelona, Spain; Movement Disorders Unit, Department of Neurology, University Hospital Mútua de Terrassa, Terrassa, 08222, Barcelona, Spain.
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Ong YL, Deng X, Tan EK. Etiologic links between environmental and lifestyle factors and Essential tremor. Ann Clin Transl Neurol 2019; 6:979-989. [PMID: 31139697 PMCID: PMC6529929 DOI: 10.1002/acn3.758] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 02/09/2019] [Accepted: 02/19/2019] [Indexed: 02/06/2023] Open
Abstract
Essential tremor (ET) is one of the most common adult movement disorders, characterized by clinical tremor and other nonmotor symptoms. It is a progressive disease that shares features with other neurodegenerative diseases. ET is a complex disease with both genetic and environmental underpinnings. While genetic forms of ET are well recognized, the role of environmental and lifestyle factors in ET has been debated. Studies suggest that exposure to neurotoxic compounds such as β‐carboline alkaloids and ethanol are potential risk factors for ET, while antioxidant intake may be protective. In addition, smoking acts as a protective factor in ET, parallel to its effects in other neurological diseases. New evidence points to pesticide and lead exposure as potential risk factors. There is growing evidence to suggest that environmental and lifestyle factors play a role in ET but additional research is needed in order to completely understand their cause and effect association. There is also a need for larger case‐control and prospective cohort studies across different populations to further evaluate the etiological importance of these factors in ET.
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Affiliation(s)
- Yi-Lin Ong
- Duke-NUS Medical School Singapore Singapore.,National Neuroscience Institute Singapore Singapore
| | - Xiao Deng
- National Neuroscience Institute Singapore Singapore
| | - Eng-King Tan
- Duke-NUS Medical School Singapore Singapore.,National Neuroscience Institute Singapore Singapore
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Alakbarzade V, Iype T, Chioza BA, Singh R, Harlalka GV, Hardy H, Sreekantan-Nair A, Proukakis C, Peall K, Clark LN, Caswell R, Lango Allen H, Wakeling M, Chilton JK, Baple EL, Louis ED, Warner TT, Crosby AH. Copy number variation of LINGO1 in familial dystonic tremor. NEUROLOGY-GENETICS 2019; 5:e307. [PMID: 30842974 PMCID: PMC6384021 DOI: 10.1212/nxg.0000000000000307] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 11/14/2018] [Indexed: 01/18/2023]
Abstract
Objective To elucidate the genetic cause of a large 5 generation South Indian family with multiple individuals with predominantly an upper limb postural tremor and posturing in keeping with another form of tremor, namely, dystonic tremor. Methods Whole-genome single nucleotide polymorphism (SNP) microarray analysis was undertaken to look for copy number variants in the affected individuals. Results Whole-genome SNP microarray studies identified a tandem duplicated genomic segment of chromosome 15q24 present in all affected family members. Whole-genome sequencing demonstrated that it comprised a ∼550-kb tandem duplication encompassing the entire LINGO1 gene. Conclusions The identification of a genomic duplication as the likely molecular cause of this condition, resulting in an additional LINGO1 gene copy in affected cases, adds further support for a causal role of this gene in tremor disorders and implicates increased expression levels of LINGO1 as a potential pathogenic mechanism.
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Affiliation(s)
- Vafa Alakbarzade
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Thomas Iype
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Barry A Chioza
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Royana Singh
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Gaurav V Harlalka
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Holly Hardy
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Ajith Sreekantan-Nair
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Christos Proukakis
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Kathryn Peall
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Lorraine N Clark
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Richard Caswell
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Hana Lango Allen
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Matthew Wakeling
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - John K Chilton
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Emma L Baple
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Elan D Louis
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Thomas T Warner
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
| | - Andrew H Crosby
- Medical Research (Level 4) (V.A., B.A.C., G.V.H., H.H., A.S.-N., J.K.C., E.L.B., A.H.C.), University of Exeter Medical School, RILD Wellcome Wolfson Centre, Royal Devon & Exeter NHS Foundation Trust, United Kingdom; Reta Lila Weston Institute of Neurological Studies (V.A., T.T.W.), UCL Institute of Neurology, London, United Kingdom; Department of Neurology (T.I.), Government Medical College, Thiruvananthapuram, Kerala, India; Department of Anatomy and Microbiology (R.S.), Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India; Clinical Neuroscience (C.P.), Royal Free Campus, UCL Institute of Neurology, London, United Kingdom; Institute of Psychological Medicine and Clinical Neurosciences (K.P.), Cardiff University, Cardiff, United Kingdom; Taub Institute for Research on Alzheimer's Disease and the Aging Brain (L.N.C.), Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY; Institute of Biomedical and Clinical Science (R.C., H.L.A., M.W.), University of Exeter Medical School, United Kingdom; and Departments of Neurology and Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research (E.D.L.), Yale School of Medicine and Yale School of Public Health, Yale University, New Haven, CT
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Tarakad A, Jankovic J. Essential Tremor and Parkinson's Disease: Exploring the Relationship. Tremor Other Hyperkinet Mov (N Y) 2019; 8:589. [PMID: 30643667 PMCID: PMC6329774 DOI: 10.7916/d8md0gvr] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 10/04/2018] [Indexed: 12/31/2022] Open
Abstract
Background There is longstanding controversy surrounding the possible link between essential tremor (ET) and Parkinson's disease (PD). Inconsistent and unreliable diagnostic criteria may in part account for some of the difficulties in defining the relationship between these two common movement disorders. Methods References for this systematic review were identified using PubMed with the search terms "essential tremor" AND "Parkinson's disease" with articles published in English between 1960 and September 2018 included. Results In this review we provide evidence that some patients diagnosed with ET have an increased risk of developing PD years or decades after onset of action tremor. There are several still unresolved questions about the link between the two disorders including lack of verifiable diagnostic criteria for the two disorders and marked overlap in phenomenology. Here we review clinical, epidemiologic, imaging, pathologic, and genetic studies that address the ET-PD relationship. Several lines of evidence support the association between ET and PD, including overlapping motor and non-motor features, relatively high prevalence of rapid eye movement sleep behavior disorder (26-43%) in ET patients, increased prevalence of PD in patients with longstanding antecedent ET, increased prevalence of ET in family members of patients with PD, and the presence of Lewy bodies in the brains of some ET patients (15-24%). Discussion There is a substantial body of evidence supporting the association between ET and PD within at least a subset of patients, although the nature and possible pathogenic mechanisms of the relationship are not well understood.
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Affiliation(s)
- Arjun Tarakad
- Parkinson’s Disease Center and Movement Disorders Clinic, Baylor College of Medicine Houston, TX, USA
| | - Joseph Jankovic
- Parkinson’s Disease Center and Movement Disorders Clinic, Baylor College of Medicine Houston, TX, USA
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Juttukonda MR, Franco G, Englot DJ, Lin YC, Petersen KJ, Trujillo P, Hedera P, Landman BA, Kang H, Donahue MJ, Konrad PE, Dawant BM, Claassen DO. White matter differences between essential tremor and Parkinson disease. Neurology 2018; 92:e30-e39. [PMID: 30504432 DOI: 10.1212/wnl.0000000000006694] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 09/05/2018] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To assess white matter integrity in patients with essential tremor (ET) and Parkinson disease (PD) with moderate to severe motor impairment. METHODS Sedated participants with ET (n = 57) or PD (n = 99) underwent diffusion tensor imaging (DTI) and fractional anisotropy, mean diffusivity, axial diffusivity, and radial diffusivity values were computed. White matter tracts were defined using 3 well-described atlases. To determine candidate white matter regions that differ between ET and PD groups, a bootstrapping analysis was applied using the least absolute shrinkage and selection operator. Linear regression was applied to assess magnitude and direction of differences in DTI metrics between ET and PD populations in the candidate regions. RESULTS Fractional anisotropy values that differentiate ET from PD localize primarily to thalamic and visual-related pathways, while diffusivity differences localized to the cerebellar peduncles. Patients with ET exhibited lower fractional anisotropy values than patients with PD in the lateral geniculate body (p < 0.01), sagittal stratum (p = 0.01), forceps major (p = 0.02), pontine crossing tract (p = 0.03), and retrolenticular internal capsule (p = 0.04). Patients with ET exhibited greater radial diffusivity values than patients with PD in the superior cerebellar peduncle (p < 0.01), middle cerebellar peduncle (p = 0.05), and inferior cerebellar peduncle (p = 0.05). CONCLUSIONS Regionally, distinctive white matter microstructural values in patients with ET localize to the cerebellar peduncles and thalamo-cortical visual pathways. These findings complement recent functional imaging studies in ET but also extend our understanding of putative physiologic features that account for distinctions between ET and PD.
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Affiliation(s)
- Meher R Juttukonda
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Giulia Franco
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Dario J Englot
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Ya-Chen Lin
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Kalen J Petersen
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Paula Trujillo
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Peter Hedera
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Bennett A Landman
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Hakmook Kang
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Manus J Donahue
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Peter E Konrad
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Benoit M Dawant
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN
| | - Daniel O Claassen
- From the Departments of Radiology and Radiological Sciences (M.R.J., M.J.D.), Neurological Surgery (D.J.E., P.E.K.), Biostatistics (Y.-C.L., H.K.), Neurology (P.T., P.H., M.J.D.), and Psychiatry (M.J.D.), Vanderbilt University Medical Center, Nashville, TN; Department of Pathophysiology and Transplantation (G.F.) University of Milan, Italy; and Chemical and Physical Biology Program (K.J.P.) and Departments of Electrical Engineering (B.A.L., B.M.D.), Computer Engineering (B.A.L., B.M.D.), Computer Science and Biomedical Engineering (B.A.L., B.M.D.), and Neurology (D.O.C.), Vanderbilt University, Nashville, TN.
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Vasechkin SV, Levin OS. [Diagnosis and management of essential tremor]. Zh Nevrol Psikhiatr Im S S Korsakova 2018; 118:64-72. [PMID: 30346436 DOI: 10.17116/jnevro201811806264] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Essential tremor (ET) is the most common extrapyramidal disease and one of the most frequent neurological diseases. The main presentation of ET is a progressive bilateral (kinetic-postural) hand tremor. The prevalence in people over 65 years is 5%, it increases with age up to 22% in people over 95 years. About half of patients with ET have family history. The modern concepts of the pathogenesis, clinical features and differential diagnosis are considered. Possible methods of medical and surgical management are described.
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Affiliation(s)
- S V Vasechkin
- Centre of Extrapyramidal Diseases Department of Neurology, Russian Medical Academy of Continuous Professional Education, Moscow, Russia
| | - O S Levin
- Centre of Extrapyramidal Diseases Department of Neurology, Russian Medical Academy of Continuous Professional Education, Moscow, Russia
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Sazci A, Uren N, Idrisoglu HA, Ergul E. The rs2228570 Variant of the Vitamin D Receptor Gene is Associated with Essential Tremor. Neurosci Bull 2018; 35:362-364. [PMID: 30225763 DOI: 10.1007/s12264-018-0287-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 05/26/2018] [Indexed: 11/24/2022] Open
Affiliation(s)
- Ali Sazci
- Department of Medical Biology and Genetics, Faculty of Medicine, University of Kocaeli, 41380, Kocaeli, Turkey.
| | - Nihal Uren
- Department of Medical Biology and Genetics, Faculty of Medicine, University of Kocaeli, 41380, Kocaeli, Turkey
| | - Halil Atilla Idrisoglu
- Department of Neurology, Istanbul Faculty of Medicine, University of Istanbul, Capa, 34260, Istanbul, Turkey
| | - Emel Ergul
- Department of Medical Biology and Genetics, Faculty of Medicine, University of Kocaeli, 41380, Kocaeli, Turkey
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Affiliation(s)
- Dietrich Haubenberger
- From the Clinical Trials Unit, Office of the Clinical Director (D.H.), and the Human Motor Control Section, Medical Neurology Branch (M.H.), National Institute of Neurological Disorders and Stroke Intramural Research Program, National Institutes of Health, Bethesda, MD
| | - Mark Hallett
- From the Clinical Trials Unit, Office of the Clinical Director (D.H.), and the Human Motor Control Section, Medical Neurology Branch (M.H.), National Institute of Neurological Disorders and Stroke Intramural Research Program, National Institutes of Health, Bethesda, MD
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Abstract
BACKGROUND Tremor is a symptom of many diseases and can constitute a disease of its own: essential tremor. OBJECTIVE The genetics of essential tremor and differential diagnosis of monogenic diseases with the symptom tremor. MATERIAL AND METHODS Literature search and search of clinical genetics databases, e.g. OMIM, GeneReviews, MDSGene and the German Neurological Society (DGN) guidelines. RESULTS The genetics of essential tremor remain unresolved in spite of large, adequately powered studies. Tremor is a symptom of differential diagnostic value in many movement disorders. A slight tremor might have been missed or not reported in many descriptions of movement disorders. CONCLUSION Progress in the genetics of essential tremor probably requires a more detailed phenotyping allowing stratification into phenotypically defined subgroups. Tremor should always be included in the examination and description of movement disorders even if tremor is not a cardinal symptom. Tremor might be helpful in the differential diagnosis of hereditary dystonia, hereditary ataxia, spastic paraplegia and other movement disorders.
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Affiliation(s)
- G Kuhlenbäumer
- Klinik für Neurologie, Universitätsklinikum Schleswig-Holstein, Campus Kiel, Christian-Albrechts-Universität Kiel, Arnold-Heller-Str. 3, 24105, Kiel, Deutschland.
| | - F Hopfner
- Klinik für Neurologie, Universitätsklinikum Schleswig-Holstein, Campus Kiel, Christian-Albrechts-Universität Kiel, Arnold-Heller-Str. 3, 24105, Kiel, Deutschland
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49
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Cristal AD, Chen KP, Hernandez NC, Factor-Litvak P, Clark LN, Ottman R, Louis ED. Knowledge about Essential Tremor: A Study of Essential Tremor Families. Front Neurol 2018; 9:27. [PMID: 29434571 PMCID: PMC5790790 DOI: 10.3389/fneur.2018.00027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 01/12/2018] [Indexed: 01/17/2023] Open
Abstract
Background Essential tremor (ET) is among the most common neurological diseases and it often runs in families. How knowledgeable ET patients and their families are about their disease has been the subject of surprisingly little scholarship. Methods To fill this gap in knowledge, we administered a comprehensive 32-item survey (i.e., questions about etiology, pathophysiology, symptoms and signs, natural history, and treatments) to 427 participants, including 76 ET probands, 74 affected relatives (AFRs), 238 unaffected relatives, and 39 spouses of unaffected relatives, all of whom were participating in two ET family studies. We hypothesized that there would be gaps in knowledge about ET and furthermore, that probands and AFRs would be the most knowledgeable, followed by unaffected relatives and then spouses of unaffected relatives, who would be the least knowledgeable. Results Overall, ET patients lacked knowledge about their disease. Nearly one-third of probands answered "yes" or "do not know" to the question, "is ET the same or different from the type of tremor that many normal people can get when they become old and frail?" A similar proportion did not know whether children could get ET or they responded "no." Nearly one-fourth of affecteds (i.e., probands and AFRs) did not know whether or to what degree (e.g., very well, moderately well, not well) the symptoms of ET could be medically controlled, and 38.0% either reported that there was no brain surgery for ET or reported that they did not know. Nearly 17% of affecteds did not endorse genes as a cause for ET, which was surprising given the fact that this was a family study of ET. Probands and AFRs were the most knowledgeable, followed by unaffected relatives. Spouses of unaffected relatives were the least knowledgeable. Conclusion We targeted a large group of ET patients and their families, as this group is perhaps most likely to be informed about the disease. ET patients and their AFRs were more knowledgeable about the features of ET than their family members without ET. Overall, however, knowledge of ET was very limited and this lack of knowledge encompassed all aspects of the disease including its underlying causes, the nature of the symptoms and signs, its natural history and its treatment. Further ET awareness education and programs targeting both families of ET patients and the public would help alleviate this gap in knowledge.
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Affiliation(s)
- Ashley D Cristal
- Division of Movement Disorders, Department of Neurology, Yale School of Medicine, Yale University, New Haven, CT, United States
| | - Karen P Chen
- Division of Movement Disorders, Department of Neurology, Yale School of Medicine, Yale University, New Haven, CT, United States
| | - Nora Cristina Hernandez
- Division of Movement Disorders, Department of Neurology, Yale School of Medicine, Yale University, New Haven, CT, United States
| | - Pam Factor-Litvak
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, United States
| | - Lorraine N Clark
- Taub Institute for Research on Alzheimer's Disease and the Aging Brain, College of Physicians and Surgeons, Columbia University, New York, NY, United States.,Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY, United States
| | - Ruth Ottman
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, United States.,G.H. Sergievsky Center, College of Physicians and Surgeons, Columbia University, New York, NY, United States.,Department of Neurology, College of Physicians and Surgeons, Columbia University, New York, NY, United States.,Department of Epidemiology, New York State Psychiatric Institute, New York, NY, United States
| | - Elan D Louis
- Division of Movement Disorders, Department of Neurology, Yale School of Medicine, Yale University, New Haven, CT, United States.,Department of Chronic Disease Epidemiology, Yale School of Public Health, Yale University, New Haven, CT, United States.,Center for Neuroepidemiology and Clinical Neurological Research, Yale School of Medicine, Yale University, New Haven, CT, United States
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50
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Abstract
Essential tremor (ET) is one of the most common neurologic disorders, and genetic factors are thought to contribute significantly to disease etiology. There has been a relative lack of progress in understanding the genetic etiology of ET. This could reflect a number of factors, including the presence of substantial phenotypic and genotypic heterogeneity. Thus, a meticulous approach to phenotyping is important for genetic research. A lack of standardized phenotyping across studies and patient centers likely has contributed to the relative lack of success of genomewide association studies in ET. To dissect the genetic architecture of ET, whole-genome sequencing will likely be of value. This will allow specific hypotheses about the mode of inheritance and genetic architecture to be tested. A number of approaches still remain unexplored in ET genetics, including the contribution of copy number variants, uncommon moderate-effect alleles, rare variant large-effect alleles (including Mendelian and complex/polygenic modes of inheritance), de novo and gonadal mosaicism, epigenetic changes, and noncoding variation.
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Affiliation(s)
- Lorraine N Clark
- Department of Pathology and Cell Biology, College of Physicians and Surgeons, and Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University, New York, NY, United States
| | - Elan D Louis
- Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University, New York; and Departments of Neurology and of Chronic Disease Epidemiology and Center for Neuroepidemiology and Clinical Neurological Research, Yale School of Medicine, New Haven, CT, United States.
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