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Yang JH, Liu ZG, Liu CL, Zhang MR, Jia YL, Zhai QX, He MF, He N, Qiao JD. MED12 variants associated with X-linked recessive partial epilepsy without intellectual disability. Seizure 2024; 116:30-36. [PMID: 36894399 DOI: 10.1016/j.seizure.2023.02.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 02/21/2023] [Accepted: 02/23/2023] [Indexed: 03/03/2023] Open
Abstract
OBJECTIVES The MED12 gene encodes mediator complex subunit 12, which is a component of the mediator complex involved in the transcriptional regulation of nearly all RNA polymerase II-dependent genes. MED12 variants have previously been associated with developmental disorders with or without nonspecific intellectual disability. This study aims to explore the association between MED12 variants and epilepsy. MATERIALS AND METHODS Trios-based whole-exome sequencing was performed in a cohort of 349 unrelated cases with partial (focal) epilepsy without acquired causes. The genotype-phenotype correlations of MED12 variants were analyzed. RESULTS Five hemizygous missense MED12 variants, including c.958A>G/p.Ile320Val, c.1757G>A/p.Ser586Asn, c.2138C>T/p.Pro713Leu, c.3379T>C/p.Ser1127Pro, and c.4219A>C/p.Met1407Leu were identified in five unrelated males with partial epilepsy. All patients showed infrequent focal seizures and achieved seizure free without developmental abnormalities or intellectual disability. All the hemizygous variants were inherited from asymptomatic mothers (consistent with the X-linked recessive inheritance pattern) and were absent in the general population. The two variants with damaging hydrogen bonds were associated with early-onset seizures. Further genotype-phenotype analysis revealed that congenital anomaly disorder (Hardikar syndrome) was associated with (de novo) destructive variants in an X-linked dominant inheritance pattern, whereas epilepsy was associated with missense variants in an X-linked recessive inheritance pattern. Phenotypic features of intellectual disability appeared as the intermediate phenotype in terms of both genotype and inheritance. Epilepsy-related variants were located at the MED12-LCEWAV domain and the regions between MED12-LCEWAV and MED12-POL. CONCLUSION MED12 is a potentially causative gene for X-linked recessive partial epilepsy without developmental or intellectual abnormalities. The genotype-phenotype correlation of MED12 variants explains the phenotypic variations and can help the genetic diagnosis.
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Affiliation(s)
- Jie-Hua Yang
- Department of Neurology, Institute of Neuroscience, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China; Department of Neurology, the Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Zhi-Gang Liu
- Department of Pediatrics, Affiliated Foshan Maternity & Child Healthcare Hospital, Southern Medical University, Foshan, Guangdong, China
| | - Chun-Ling Liu
- Department of Neurology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Ming-Rui Zhang
- Department of Neurology, Institute of Neuroscience, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Yan-Lu Jia
- Department of Neurology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Qiong-Xiang Zhai
- Department of pediatrics, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Ming-Feng He
- Department of Neurology, Institute of Neuroscience, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Na He
- Department of Neurology, Institute of Neuroscience, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China.
| | - Jing-Da Qiao
- Department of Neurology, Institute of Neuroscience, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, China.
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Martinez D, Jiang E, Zhou Z. Overcoming genetic and cellular complexity to study the pathophysiology of X-linked intellectual disabilities. J Neurodev Disord 2024; 16:5. [PMID: 38424476 PMCID: PMC10902969 DOI: 10.1186/s11689-024-09517-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 02/04/2024] [Indexed: 03/02/2024] Open
Abstract
X-linked genetic causes of intellectual disability (ID) account for a substantial proportion of cases and remain poorly understood, in part due to the heterogeneous expression of X-linked genes in females. This is because most genes on the X chromosome are subject to random X chromosome inactivation (XCI) during early embryonic development, which results in a mosaic pattern of gene expression for a given X-linked mutant allele. This mosaic expression produces substantial complexity, especially when attempting to study the already complicated neural circuits that underly behavior, thus impeding the understanding of disease-related pathophysiology and the development of therapeutics. Here, we review a few selected X-linked forms of ID that predominantly affect heterozygous females and the current obstacles for developing effective therapies for such disorders. We also propose a genetic strategy to overcome the complexity presented by mosaicism in heterozygous females and highlight specific tools for studying synaptic and circuit mechanisms, many of which could be shared across multiple forms of intellectual disability.
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Affiliation(s)
- Dayne Martinez
- Department of Genetics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19102, USA
- Medical Scientist Training Program, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19102, USA
| | - Evan Jiang
- Department of Genetics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19102, USA
- Medical Scientist Training Program, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19102, USA
| | - Zhaolan Zhou
- Department of Genetics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19102, USA.
- Medical Scientist Training Program, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19102, USA.
- Department of Neuroscience, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19102, USA.
- Intellectual and Developmental Disabilities Research Center, Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA.
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3
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Ediae GU, Chisholm C, Lemire G, Campbell F, Boycott KM. Pathogenic variant in the X-linked ARR3 gene associated with variable early-onset myopia. Am J Med Genet A 2024; 194:397-399. [PMID: 37795829 DOI: 10.1002/ajmg.a.63435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 09/22/2023] [Accepted: 09/25/2023] [Indexed: 10/06/2023]
Affiliation(s)
- Grace Uwaila Ediae
- Regional Genetics Program, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
| | - Caitlin Chisholm
- Regional Genetics Program, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada
| | - Gabrielle Lemire
- Regional Genetics Program, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
| | | | - Kym M Boycott
- Regional Genetics Program, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
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Sahajpal N, Ziats C, Chaubey A, DuPont BR, Abidi F, Schwartz CE, Stevenson RE. Clinical findings in individuals with duplication of genes associated with X-linked intellectual disability. Clin Genet 2024; 105:173-184. [PMID: 37899624 DOI: 10.1111/cge.14445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 09/25/2023] [Accepted: 10/13/2023] [Indexed: 10/31/2023]
Abstract
Duplication of all genes associated with X-linked intellectual disability (XLID) have been reported but the majority of the duplications include more than one XLID gene. It is exceptional for whole XLID gene duplications to cause the same phenotype as sequence variants or deletions of the same gene. Duplication of PLP1, the gene associated with Pelizaeus-Merzbacher syndrome, is the most notable duplication of this type. More commonly, duplication of XLID genes results in very different phenotypes than sequence alterations or deletions. Duplication of MECP2 is widely recognized as a duplication of this type, but a number of others exist. The phenotypes associated with gene duplications are often milder than those caused by deletions and sequence variants. Among some duplications that are clinically significant, marked skewing of X-inactivation in female carriers has been observed. This report describes the phenotypic consequences of duplication of 22 individual XLID genes, of which 10 are described for the first time.
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Affiliation(s)
- Nikhil Sahajpal
- Diagnostic Laboratories, Greenwood Genetic Center, Greenwood, South Carolina, USA
| | - Catherine Ziats
- Genetics Department, Shodair Children's Hospital, Helena, Montana, USA
| | - Alka Chaubey
- Clinical and Scientific Affairs, Bionano Genomics, San Diego, California, USA
| | - Barbara R DuPont
- Diagnostic Laboratories, Greenwood Genetic Center, Greenwood, South Carolina, USA
| | - Fatima Abidi
- Diagnostic Laboratories, Greenwood Genetic Center, Greenwood, South Carolina, USA
| | - Charles E Schwartz
- Department of Pediatrics and Human Development, Michigan State University, Grand Rapids, Michigan, USA
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Zi F, Li Z, Cheng W, Huang X, Sheng X, Rong W. Novel mutations of the X-linked genes associated with early-onset high myopia in five Chinese families. BMC Med Genomics 2023; 16:223. [PMID: 37749571 PMCID: PMC10521526 DOI: 10.1186/s12920-023-01665-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Accepted: 09/18/2023] [Indexed: 09/27/2023] Open
Abstract
PURPOSE To report novel pathogenic variants of X-linked genes in five Chinese families with early-onset high myopia (eoHM) by using whole-exome sequencing and analyzing the phenotypic features. METHODS 5 probands with X-linked recessive related eoHM were collected in Ningxia Eye Hospital from January 2021 to June 2022. The probands and their family members received comprehensive ophthalmic examinations,and DNA was abstracted from patients and family members. Whole-exome sequencing was performed on probands to screen the causative variants, and all suspected pathogenic variants were determined by Sanger sequencing and co-segregation analysis was performed on available family members. The pathogenicity of novel variants was predicted using silico analysis and evaluated according to ACMG guidelines. RT-qPCR was used to detect differences in the relative mRNAs expression of candidate gene in mRNAs available with the proband and family members in the pedigree 2. The relationship between genetic variants and clinical features was analyzed. RESULTS All probands were male, and all pedigrees conformed to an X-linked recessive inheritance pattern. They were diagnosed with high myopia at their first visits between 4 and 7 years old. Spherical equivalent ranged between - 6.00D and - 11.00D.The five novel hemizygous variants were found in the probands, containing frameshift deletion variant c.797_801del (p.Val266Alafs*75) of OPN1LW gene in the pedigree 1, nonsense variant c.513G > A (p.Trp171Ter)of RP2 gene in the pedigree 2, missense variant c.98G > T (p.Cys33Phe) of GPR143 gene in the pedigree 3, frameshift deletion variant c.1876_1877del (p.Met626Valfs*22) of FRMD7 gene in the pedigree 4 and inframe deletion variant c.670_ 675del (p.Glu192_ Glu193del) of HMGB3 gene in the pedigree 5. All variants were classified as pathogenic or likely pathogenic by the interpretation principles of HGMD sequence variants and ACMG guidelines. In family 2, RT-qPCR showed that the mRNA expression of RP2 gene was lower in the proband than in other normal family members, indicating that such variant caused an effect on gene function at the mRNA expression level. Further clinical examination showed that pedigrees 1, 2, 3, and 4 were diagnosed as X-linked recessive hereditary eye disease with early-onset high myopia, including quiescent cone dysfunction, retinitis pigmentosa, ocular albinism, and idiopathic congenital nystagmus respectively. The pedigree 5 had eoHM in the right eye and ptosis in both eyes. CONCLUSION In this paper,we are the first to report five novel hemizygous variants in OPN1LW, RP2, GPR143, FRMD7, HMGB3 genes are associated with eoHM. Our study extends the genotypic spectrums for eoHM and better assists ophthalmologists in assessing, diagnosing, and conducting genetic screening for eoHM.
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Affiliation(s)
- Feiyin Zi
- Clinical Medical College, Ningxia Medical University, Yinchuan, 750001, China
| | - Zhen Li
- Department of Ophthalmology, Ningxia Eye Hospital, People's Hospital of Ningxia Hui Autonomous Region, Third Clinical Medical College of Ningxia Medical University, 936 Huanghe East Road, Jinfeng District, Yinchuan, 750001, China
| | - Wanyu Cheng
- Clinical Medical College, Ningxia Medical University, Yinchuan, 750001, China
| | - Xiaoyu Huang
- Clinical Medical College, Ningxia Medical University, Yinchuan, 750001, China
| | - Xunlun Sheng
- Gansu Aier Ophthalmiology and Optometry Hospital, 1228 Guazhou Road, Qilihe District, Lanzhou, 730050, China.
| | - Weining Rong
- Department of Ophthalmology, Ningxia Eye Hospital, People's Hospital of Ningxia Hui Autonomous Region, Third Clinical Medical College of Ningxia Medical University, 936 Huanghe East Road, Jinfeng District, Yinchuan, 750001, China.
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Ha TT, Burgess R, Newman M, Moey C, Mandelstam SA, Gardner AE, Ivancevic AM, Pham D, Kumar R, Smith N, Patel C, Malone S, Ryan MM, Calvert S, van Eyk CL, Lardelli M, Berkovic SF, Leventer RJ, Richards LJ, Scheffer IE, Gecz J, Corbett MA. Aicardi Syndrome Is a Genetically Heterogeneous Disorder. Genes (Basel) 2023; 14:1565. [PMID: 37628618 PMCID: PMC10454071 DOI: 10.3390/genes14081565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 08/27/2023] Open
Abstract
Aicardi Syndrome (AIC) is a rare neurodevelopmental disorder recognized by the classical triad of agenesis of the corpus callosum, chorioretinal lacunae and infantile epileptic spasms syndrome. The diagnostic criteria of AIC were revised in 2005 to include additional phenotypes that are frequently observed in this patient group. AIC has been traditionally considered as X-linked and male lethal because it almost exclusively affects females. Despite numerous genetic and genomic investigations on AIC, a unifying X-linked cause has not been identified. Here, we performed exome and genome sequencing of 10 females with AIC or suspected AIC based on current criteria. We identified a unique de novo variant, each in different genes: KMT2B, SLF1, SMARCB1, SZT2 and WNT8B, in five of these females. Notably, genomic analyses of coding and non-coding single nucleotide variants, short tandem repeats and structural variation highlighted a distinct lack of X-linked candidate genes. We assessed the likely pathogenicity of our candidate autosomal variants using the TOPflash assay for WNT8B and morpholino knockdown in zebrafish (Danio rerio) embryos for other candidates. We show expression of Wnt8b and Slf1 are restricted to clinically relevant cortical tissues during mouse development. Our findings suggest that AIC is genetically heterogeneous with implicated genes converging on molecular pathways central to cortical development.
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Affiliation(s)
- Thuong T. Ha
- School of Biological Sciences, Faculty of Science, University of Adelaide, Adelaide, SA 5005, Australia
- Department of Genetics and Molecular Pathology, Centre for Cancer Biology, An Alliance between SA Pathology and the University of South Australia, Adelaide, SA 5000, Australia
| | - Rosemary Burgess
- Epilepsy Research Centre, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Austin Health, Heidelberg, VIC 3084, Australia (S.F.B.); (I.E.S.)
| | - Morgan Newman
- Alzheimer’s Disease Genetics Laboratory, School of Biological Sciences, Faculty of Science, University of Adelaide, Adelaide, SA 5005, Australia (M.L.)
| | - Ching Moey
- The Queensland Brain Institute, The School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD 4000, Australia
| | - Simone A. Mandelstam
- Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, VIC 3052, Australia
- Department of Medical Imaging, The Royal Children’s Hospital, Melbourne, VIC 3052, Australia
| | - Alison E. Gardner
- Adelaide Medical School and Robinson Research Institute, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia (M.A.C.)
| | - Atma M. Ivancevic
- Department of Molecular, Cellular, and Developmental Biology, College of Arts and Sciences, University of Colorado, Boulder, CO 80309, USA
| | - Duyen Pham
- Adelaide Medical School and Robinson Research Institute, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia (M.A.C.)
| | - Raman Kumar
- Adelaide Medical School and Robinson Research Institute, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia (M.A.C.)
| | - Nicholas Smith
- Adelaide Medical School and Robinson Research Institute, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia (M.A.C.)
- Department of Neurology, Women’s and Children’s Hospital, North Adelaide, SA 5006, Australia
| | - Chirag Patel
- Genetic Health Queensland, Royal Brisbane and Women’s Hospital, Herston, QLD 4029, Australia
| | - Stephen Malone
- Queensland Children’s Hospital, South Brisbane, QLD 4101, Australia
| | - Monique M. Ryan
- Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, VIC 3052, Australia
- Department of Neurology, The Royal Children’s Hospital, Parkville, VIC 3052, Australia
- Murdoch Children’s Research Institute, Parkville, VIC 3052, Australia
| | - Sophie Calvert
- Department of Neurosciences, Queensland Children’s Hospital, South Brisbane, QLD 4101, Australia;
| | - Clare L. van Eyk
- Adelaide Medical School and Robinson Research Institute, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia (M.A.C.)
| | - Michael Lardelli
- Alzheimer’s Disease Genetics Laboratory, School of Biological Sciences, Faculty of Science, University of Adelaide, Adelaide, SA 5005, Australia (M.L.)
| | - Samuel F. Berkovic
- Epilepsy Research Centre, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Austin Health, Heidelberg, VIC 3084, Australia (S.F.B.); (I.E.S.)
| | - Richard J. Leventer
- Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, VIC 3052, Australia
- Department of Neurology, The Royal Children’s Hospital, Parkville, VIC 3052, Australia
- Murdoch Children’s Research Institute, Parkville, VIC 3052, Australia
| | - Linda J. Richards
- The Queensland Brain Institute, The School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD 4000, Australia
- Department of Neuroscience, School of Medicine, Washington University, St Louis, MO 63110, USA
| | - Ingrid E. Scheffer
- Epilepsy Research Centre, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Austin Health, Heidelberg, VIC 3084, Australia (S.F.B.); (I.E.S.)
- Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, VIC 3052, Australia
- Department of Neurology, The Royal Children’s Hospital, Parkville, VIC 3052, Australia
- Murdoch Children’s Research Institute, Parkville, VIC 3052, Australia
- Florey Institute of Neuroscience and Mental Health, Parkville, VIC 3052, Australia
| | - Jozef Gecz
- School of Biological Sciences, Faculty of Science, University of Adelaide, Adelaide, SA 5005, Australia
- Adelaide Medical School and Robinson Research Institute, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia (M.A.C.)
- South Australian Health and Medical Research Institute, Adelaide, SA 5000, Australia
| | - Mark A. Corbett
- Adelaide Medical School and Robinson Research Institute, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia (M.A.C.)
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Suthakaran N, Wiggins J, Giles A, Opperman KJ, Grill B, Dawson-Scully K. O-GlcNAc transferase OGT-1 and the ubiquitin ligase EEL-1 modulate seizure susceptibility in C. elegans. PLoS One 2021; 16:e0260072. [PMID: 34797853 PMCID: PMC8604358 DOI: 10.1371/journal.pone.0260072] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 11/01/2021] [Indexed: 11/18/2022] Open
Abstract
Neurodevelopmental disorders such as epilepsy and autism have been linked to an imbalance of excitation and inhibition (E/I) in the central nervous system. The simplicity and tractability of C. elegans allows our electroconvulsive seizure (ES) assay to be used as a behavioral readout of the locomotor circuit and neuronal function. C. elegans possess conserved nervous system features such as gamma-aminobutyric acid (GABA) and GABA receptors in inhibitory neurotransmission, and acetylcholine (Ach) and acetylcholine receptors in excitatory neurotransmission. Our previously published data has shown that decreasing inhibition in the motor circuit, via GABAergic manipulation, will extend the time of locomotor recovery following electroshock. Similarly, mutations in a HECT E3 ubiquitin ligase called EEL-1 leads to impaired GABAergic transmission, E/I imbalance and altered sensitivity to electroshock. Mutations in the human ortholog of EEL-1, called HUWE1, are associated with both syndromic and non-syndromic intellectual disability. Both EEL-1 and its previously established binding protein, OGT-1, are expressed in GABAergic motor neurons, localize to GABAergic presynaptic terminals, and function in parallel to regulate GABA neuron function. In this study, we tested behavioral responses to electroshock in wildtype, ogt-1, eel-1 and ogt-1; eel-1 double mutants. Both ogt-1 and eel-1 null mutants have decreased inhibitory GABAergic neuron function and increased electroshock sensitivity. Consistent with EEL-1 and OGT-1 functioning in parallel pathways, ogt-1; eel-1 double mutants showed enhanced electroshock susceptibility. Expression of OGT-1 in the C. elegans nervous system rescued enhanced electroshock defects in ogt-1; eel-1 double mutants. Application of a GABA agonist, Baclofen, decreased electroshock susceptibility in all animals. Our C. elegans electroconvulsive seizure assay was the first to model a human X-linked Intellectual Disability (XLID) associated with epilepsy and suggests a potential novel role for the OGT-1/EEL-1 complex in seizure susceptibility.
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Affiliation(s)
- Nirthieca Suthakaran
- Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida, United States of America
| | - Jonathan Wiggins
- Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida, United States of America
| | - Andrew Giles
- Department of Neuroscience, The Scripps Research Institute, Jupiter, Florida, United States of America
| | - Karla J. Opperman
- Center for Integrative Brain Research, Seattle Children’s Research Institute, Seattle, Washington, United States of America
| | - Brock Grill
- Center for Integrative Brain Research, Seattle Children’s Research Institute, Seattle, Washington, United States of America
- Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington, United States of America
- Department of Pharmacology, University of Washington School of Medicine, Seattle, Washington, United States of America
| | - Ken Dawson-Scully
- Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida, United States of America
- * E-mail:
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Barbier M, Camuzat A, Hachimi KE, Guegan J, Rinaldi D, Lattante S, Houot M, Sánchez-Valle R, Sabatelli M, Antonell A, Molina-Porcel L, Clot F, Couratier P, van der Ende E, van der Zee J, Manzoni C, Camu W, Cazeneuve C, Sellal F, Didic M, Golfier V, Pasquier F, Duyckaerts C, Rossi G, Bruni AC, Alvarez V, Gómez-Tortosa E, de Mendonça A, Graff C, Masellis M, Nacmias B, Oumoussa BM, Jornea L, Forlani S, Van Deerlin V, Rohrer JD, Gelpi E, Rademakers R, Van Swieten J, Le Guern E, Van Broeckhoven C, Ferrari R, Génin E, Brice A, Le Ber I. SLITRK2, an X-linked modifier of the age at onset in C9orf72 frontotemporal lobar degeneration. Brain 2021; 144:2798-2811. [PMID: 34687211 DOI: 10.1093/brain/awab171] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 03/05/2021] [Accepted: 04/01/2021] [Indexed: 11/13/2022] Open
Abstract
The G4C2-repeat expansion in C9orf72 is the most common cause of frontotemporal dementia and of amyotrophic lateral sclerosis. The variability of age at onset and phenotypic presentations is a hallmark of C9orf72 disease. In this study, we aimed to identify modifying factors of disease onset in C9orf72 carriers using a family-based approach, in pairs of C9orf72 carrier relatives with concordant or discordant age at onset. Linkage and association analyses provided converging evidence for a locus on chromosome Xq27.3. The minor allele A of rs1009776 was associated with an earlier onset (P = 1 × 10-5). The association with onset of dementia was replicated in an independent cohort of unrelated C9orf72 patients (P = 0.009). The protective major allele delayed the onset of dementia from 5 to 13 years on average depending on the cohort considered. The same trend was observed in an independent cohort of C9orf72 patients with extreme deviation of the age at onset (P = 0.055). No association of rs1009776 was detected in GRN patients, suggesting that the effect of rs1009776 was restricted to the onset of dementia due to C9orf72. The minor allele A is associated with a higher SLITRK2 expression based on both expression quantitative trait loci (eQTL) databases and in-house expression studies performed on C9orf72 brain tissues. SLITRK2 encodes for a post-synaptic adhesion protein. We further show that synaptic vesicle glycoprotein 2 and synaptophysin, two synaptic vesicle proteins, were decreased in frontal cortex of C9orf72 patients carrying the minor allele. Upregulation of SLITRK2 might be associated with synaptic dysfunctions and drives adverse effects in C9orf72 patients that could be modulated in those carrying the protective allele. How the modulation of SLITRK2 expression affects synaptic functions and influences the disease onset of dementia in C9orf72 carriers will require further investigations. In summary, this study describes an original approach to detect modifier genes in rare diseases and reinforces rising links between C9orf72 and synaptic dysfunctions that might directly influence the occurrence of first symptoms.
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Affiliation(s)
- Mathieu Barbier
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
| | - Agnès Camuzat
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
| | - Khalid El Hachimi
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
| | - Justine Guegan
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
| | - Daisy Rinaldi
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
- Center for Rare or Early-Onset Dementias, IM2A, Département de Neurologie, AP-HP-Hôpital Pitié-Salpêtrière, Paris, France
| | - Serena Lattante
- Sezione di Medicina Genomica, Dipartimento Scienze della Vita e Sanità Pubblica, Facoltà di Medicina e Chirurgia, Università Cattolica Sacro Cuore; U.O.C. Genetica Medica, Dipartimento di Scienze di Laboratorio e Infettivologico, Fondazione Policlinico Universitario 'A. Gemelli' IRCCS, Rome, Italy
| | - Marion Houot
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
- Center for Rare or Early-Onset Dementias, IM2A, Département de Neurologie, AP-HP-Hôpital Pitié-Salpêtrière, Paris, France
- Centre of Excellence of Neurodegenerative Disease (CoEN), Hôpital Pitié-Salpêtrière, Paris, France
| | - Raquel Sánchez-Valle
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clínic, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona, 08036 Barcelona, Catalunya, Spain
| | - Mario Sabatelli
- Adult NEMO Clinical Center, Unit of Neurology, Department of Aging, Neurological, Orthopedic and Head-Neck Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy
- Section of Neurology, Department of Neuroscience, Faculty of Medicine and Surgery, Università Cattolica del Sacro Cuore, 00168 Rome, Italy
| | - Anna Antonell
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clínic, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona, 08036 Barcelona, Catalunya, Spain
| | - Laura Molina-Porcel
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clínic, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona, 08036 Barcelona, Catalunya, Spain
- Neurological Tissue Bank of the Biobank-Hospital Clinic-IDIBAPS, Barcelona, Catalunya, Spain
| | - Fabienne Clot
- Unité Fonctionnelle de Neurogénétique Moléculaire et Cellulaire, Département de Génétique et Cytogénétique, AP-HP, Hôpitaux Universitaires La Pitié Salpêtrière-Charles Foix, Paris, France
| | | | - Emma van der Ende
- Department of Neurology, Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | - Julie van der Zee
- Neurodegenerative Brain Diseases Group, VIB Center for Molecular Neurology, VIB, Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | | | - William Camu
- Reference Centre for ALS, University Hospital Gui de Chauliac, University of Montpellier, Montpellier, France
| | - Cécile Cazeneuve
- Unité Fonctionnelle de Neurogénétique Moléculaire et Cellulaire, Département de Génétique et Cytogénétique, AP-HP, Hôpitaux Universitaires La Pitié Salpêtrière-Charles Foix, Paris, France
| | - François Sellal
- Neurology Department, Hôpitaux Civils de Colmar, France
- INSERM U-1118, Strasbourg University, Strasbourg, France
| | - Mira Didic
- APHM, Timone, Service de Neurologie et Neuropsychologie, Hôpital Timone Adultes, Marseille, France
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France
| | - Véronique Golfier
- Service de Neurologie, Centre Hospitalier Yves Le Foll, Saint Brieuc, France
| | - Florence Pasquier
- University of Lille, Inserm UMRS1172, CHU, DISTAlz, LiCEND, F-59000 Lille, France
| | - Charles Duyckaerts
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
- Laboratoire de Neuropathologie Escourolle, Hôpital de la Pitié-Salpêtrière, AP-HP, Paris, France
| | - Giacomina Rossi
- Division of Neurology V and Neuropathology; Fondazione IRCCS Istituto Neurologico Carlo Besta, Milano, Italy
| | - Amalia C Bruni
- Regional Neurogenetic Centre, Department of Primary Care, ASP-CZ, Catanzaro, Italy
| | - Victoria Alvarez
- Laboratorio de Genética- Hospital Universitario Central de Asturias, Oviedo, Spain
- Instituto de INvestigación Biosanitaria del Principado de Asturias (ISPA), Oviedo, Spain
| | | | | | - Caroline Graff
- Department of Geriatric Medicine, Karolinska University Hospital-Huddinge, Stockholm, Sweden
| | - Mario Masellis
- Hurvitz Brain Sciences Program, Sunnybrook Research Institute; Department of Medicine (Neurology), Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Canada
| | - Benedetta Nacmias
- Department of Neuroscience, Psychology, Drug Research and Child Health, University of Florence, Florence, Italy
- IRCCS Fondazione Don Carlo Gnocchi, Florence, Italy
| | - Badreddine Mohand Oumoussa
- Sorbonne Université, Inserm, UMS Production et Analyse des données en Sciences de la vie et en Santé, PASS, Plateforme Post-génomique de la Pitié-Salpêtrière, P3S, F-75013, Paris, France
| | - Ludmila Jornea
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
| | - Sylvie Forlani
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
| | | | - Viviana Van Deerlin
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jonathan D Rohrer
- Dementia Research Centre, Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, University College London, London, UK
| | - Ellen Gelpi
- Neurological Tissue Bank of the Biobank-Hospital Clinic-IDIBAPS, Barcelona, Catalunya, Spain
- Division of Neuropathology and Neurochemistry, Department of Neurology, Medical University of Vienna, Vienna, Austria
| | - Rosa Rademakers
- Neurodegenerative Brain Diseases Group, VIB Center for Molecular Neurology, VIB, Antwerp, Belgium
| | - John Van Swieten
- Department of Neurology, Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | - Eric Le Guern
- Unité Fonctionnelle de Neurogénétique Moléculaire et Cellulaire, Département de Génétique et Cytogénétique, AP-HP, Hôpitaux Universitaires La Pitié Salpêtrière-Charles Foix, Paris, France
| | - Christine Van Broeckhoven
- Neurodegenerative Brain Diseases Group, VIB Center for Molecular Neurology, VIB, Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | | | - Emmanuelle Génin
- Génétique, Génomique Fonctionnelle et Biotechnologies, Faculté de Médecine, Univ Brest, Inserm UMR1078, Brest, France
| | - Alexis Brice
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
| | - Isabelle Le Ber
- Sorbonne Université, Institut du Cerveau-Paris Brain Institute-ICM, Hôpital de la Salpêtrière, Inserm U 1127, CNRS UMR 7225, 75013, Paris, France
- Center for Rare or Early-Onset Dementias, IM2A, Département de Neurologie, AP-HP-Hôpital Pitié-Salpêtrière, Paris, France
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9
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Grosz BR, Svaren J, Perez-Siles G, Nicholson GA, Kennerson ML. Revisiting the pathogenic mechanism of the GJB1 5' UTR c.-103C > T mutation causing CMTX1. Neurogenetics 2021; 22:149-160. [PMID: 34089394 PMCID: PMC8241655 DOI: 10.1007/s10048-021-00650-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 05/25/2021] [Indexed: 11/25/2022]
Abstract
The second most common form of Charcot-Marie-Tooth neuropathy (CMT), X-linked CMT type X1 (CMTX1), is caused by coding and non-coding mutations in the gap junction beta 1 (GJB1) gene. The non-coding GJB1 c.-103C > T mutation (NM_000166.5) has been reported to cause CMTX1 in multiple families. This study assessed the internal ribosomal entry site (IRES) activity previously reported for the rat Gjb1 P2 5' untranslated region (UTR). Using a bicistronic assay and transfecting RT4 Schwann cells, IRES activity of the human GJB1 P2 5' UTR was compared to the GJB1 P2 5' UTR containing either the c.-103C > T mutation or the non-pathogenic c.-102G > A variant. No differences in GJB1 P2 5' UTR IRES activity were observed between the negative control, the wild-type P2 5' UTR, the c.-103C > T 5' UTR or the c.-102G > A 5' UTR, irrespective of the GJB1 intron being present (p = .429 with intron, and p = .865 without). A theoretical c.-131A > G variant was predicted to result in the same RNA secondary structure as the GJB1 c.-103C > T P2 5' UTR. However, no significant difference was observed between expression from the wild-type GJB1 P2 5' UTR and the GJB1 c.-131A > G variant (p = .688). Deletion of the conserved region surrounding the c.-103C > T mutation (c.-108_-103del) resulted in significantly higher expression than the c.-103C > T mutation alone (p = .019), suggesting that the conserved c.-108_-103 region was not essential for translation. The reporter assays in this study do not recapitulate the previously reported GJB1 IRES activity and suggest an alternate pathogenic mechanism for the c.-103C > T CMTX1 non-coding mutation.
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Affiliation(s)
- Bianca R Grosz
- Northcott Neuroscience Laboratory, ANZAC Research Institute, Concord, NSW, Australia.
- Sydney Medical School, University of Sydney, Camperdown, NSW, Australia.
| | - John Svaren
- Sydney Medical School, University of Sydney, Camperdown, NSW, Australia
- Waisman Center, University of Wisconsin-Madison, Madison, WI, USA
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA
| | - Gonzalo Perez-Siles
- Northcott Neuroscience Laboratory, ANZAC Research Institute, Concord, NSW, Australia
- Sydney Medical School, University of Sydney, Camperdown, NSW, Australia
| | - Garth A Nicholson
- Northcott Neuroscience Laboratory, ANZAC Research Institute, Concord, NSW, Australia
- Sydney Medical School, University of Sydney, Camperdown, NSW, Australia
- Molecular Medicine Laboratory, Concord Repatriation General Hospital, Concord, NSW, Australia
| | - Marina L Kennerson
- Northcott Neuroscience Laboratory, ANZAC Research Institute, Concord, NSW, Australia
- Sydney Medical School, University of Sydney, Camperdown, NSW, Australia
- Molecular Medicine Laboratory, Concord Repatriation General Hospital, Concord, NSW, Australia
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10
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Joyce H, Burmeister LM, Wright H, Fleming L, Oliver JAC, Mellersh C. Identification of a variant in NDP associated with X-linked retinal dysplasia in the English cocker spaniel dog. PLoS One 2021; 16:e0251071. [PMID: 33945575 PMCID: PMC8096109 DOI: 10.1371/journal.pone.0251071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 04/19/2021] [Indexed: 01/09/2023] Open
Abstract
Purpose Three related male English Cocker Spaniels (ECS) were reported to be congenitally blind. Examination of one of these revealed complete retinal detachment. A presumptive diagnosis of retinal dysplasia (RD) was provided and pedigree analysis was suggestive of an X-linked mode of inheritance. We sought to investigate the genetic basis of RD in this family of ECS. Methods Following whole genome sequencing (WGS) of the one remaining male RD-affected ECS, two distinct investigative approaches were employed: a candidate gene approach and a whole genome approach. In the candidate gene approach, COL9A2, COL9A3, NHEJ1, RS1 and NDP genes were investigated based on their known associations with RD and retinal detachment in dogs and humans. In the whole genome approach, affected WGS was compared with 814 unaffected canids to identify candidate variants, which were filtered based on appropriate segregation and predicted pathogenic effects followed by subsequent investigation of gene function. Candidate variants were tested for appropriate segregation in the ECS family and association with disease was assessed using samples from a total of 180 ECS. Results The same variant in NDP (c.653_654insC, p.Met114Hisfs*16) that was predicted to result in 15 aberrant amino acids before a premature stop in norrin protein, was identified independently by both approaches and was shown to segregate appropriately within the ECS family. Association of this variant with X-linked RD was significant (P = 0.0056). Conclusions For the first time, we report a variant associated with canine X-linked RD. NDP variants are already known to cause X-linked RD, along with other abnormalities, in human Norrie disease. Thus, the dog may serve as a useful large animal model for research.
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Affiliation(s)
- Hannah Joyce
- Department of Ophthalmology, Dick White Referrals, Six Mile Bottom, Cambridgeshire, United Kingdom
- Department of Ophthalmology, Centre for Small Animal Studies, Animal Health Trust, Kentford, Newmarket, United Kingdom
- * E-mail:
| | - Louise M. Burmeister
- Department of Canine Genetics, Kennel Club Genetics Centre, Animal Health Trust, Kentford, Newmarket, United Kingdom
| | - Hattie Wright
- Department of Canine Genetics, Kennel Club Genetics Centre, Animal Health Trust, Kentford, Newmarket, United Kingdom
| | - Lorraine Fleming
- Department of Ophthalmology, Dick White Referrals, Six Mile Bottom, Cambridgeshire, United Kingdom
- Department of Ophthalmology, Centre for Small Animal Studies, Animal Health Trust, Kentford, Newmarket, United Kingdom
| | - James A. C. Oliver
- Department of Ophthalmology, Dick White Referrals, Six Mile Bottom, Cambridgeshire, United Kingdom
| | - Cathryn Mellersh
- Department of Canine Genetics, Kennel Club Genetics Centre, Animal Health Trust, Kentford, Newmarket, United Kingdom
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11
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Juchniewicz P, Piotrowska E, Kloska A, Podlacha M, Mantej J, Węgrzyn G, Tukaj S, Jakóbkiewicz-Banecka J. Dosage Compensation in Females with X-Linked Metabolic Disorders. Int J Mol Sci 2021; 22:ijms22094514. [PMID: 33925963 PMCID: PMC8123450 DOI: 10.3390/ijms22094514] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/20/2021] [Accepted: 04/22/2021] [Indexed: 01/19/2023] Open
Abstract
Through the use of new genomic and metabolomic technologies, our comprehension of the molecular and biochemical etiologies of genetic disorders is rapidly expanding, and so are insights into their varying phenotypes. Dosage compensation (lyonization) is an epigenetic mechanism that balances the expression of genes on heteromorphic sex chromosomes. Many studies in the literature have suggested a profound influence of this phenomenon on the manifestation of X-linked disorders in females. In this review, we summarize the clinical and genetic findings in female heterozygotic carriers of a pathogenic variant in one of ten selected X-linked genes whose defects result in metabolic disorders.
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Affiliation(s)
- Patrycja Juchniewicz
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (P.J.); (A.K.); (J.J.-B.)
| | - Ewa Piotrowska
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (M.P.); (J.M.); (G.W.); (S.T.)
- Correspondence: ; Tel.: +48-58-523-6040
| | - Anna Kloska
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (P.J.); (A.K.); (J.J.-B.)
| | - Magdalena Podlacha
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (M.P.); (J.M.); (G.W.); (S.T.)
| | - Jagoda Mantej
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (M.P.); (J.M.); (G.W.); (S.T.)
| | - Grzegorz Węgrzyn
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (M.P.); (J.M.); (G.W.); (S.T.)
| | - Stefan Tukaj
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (M.P.); (J.M.); (G.W.); (S.T.)
| | - Joanna Jakóbkiewicz-Banecka
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (P.J.); (A.K.); (J.J.-B.)
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12
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Aprigliano R, Aksu ME, Bradamante S, Mihaljevic B, Wang W, Rian K, Montaldo NP, Grooms KM, Fordyce Martin SL, Bordin DL, Bosshard M, Peng Y, Alexov E, Skinner C, Liabakk NB, Sullivan GJ, Bjørås M, Schwartz CE, van Loon B. Increased p53 signaling impairs neural differentiation in HUWE1-promoted intellectual disabilities. Cell Rep Med 2021; 2:100240. [PMID: 33948573 PMCID: PMC8080178 DOI: 10.1016/j.xcrm.2021.100240] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 01/18/2021] [Accepted: 03/16/2021] [Indexed: 02/06/2023]
Abstract
Essential E3 ubiquitin ligase HUWE1 (HECT, UBA, and WWE domain containing 1) regulates key factors, such as p53. Although mutations in HUWE1 cause heterogenous neurodevelopmental X-linked intellectual disabilities (XLIDs), the disease mechanisms common to these syndromes remain unknown. In this work, we identify p53 signaling as the central process altered in HUWE1-promoted XLID syndromes. By focusing on Juberg-Marsidi syndrome (JMS), one of the severest XLIDs, we show that increased p53 signaling results from p53 accumulation caused by HUWE1 p.G4310R destabilization. This further alters cell-cycle progression and proliferation in JMS cells. Modeling of JMS neurodevelopment reveals majorly impaired neural differentiation accompanied by increased p53 signaling. The neural differentiation defects can be successfully rescued by reducing p53 levels and restoring the expression of p53 target genes, in particular CDKN1A/p21. In summary, our findings suggest that increased p53 signaling underlies HUWE1-promoted syndromes and impairs XLID JMS neural differentiation.
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Affiliation(s)
- Rossana Aprigliano
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
- Department of Molecular Mechanisms of Disease, University of Zurich, 8057 Zürich, Switzerland
| | - Merdane Ezgi Aksu
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
| | - Stefano Bradamante
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
- Department of Pathology and Medical Genetics, St. Olavs University Hospital, 7049 Trondheim, Norway
| | - Boris Mihaljevic
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
| | - Wei Wang
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
| | - Kristin Rian
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
| | - Nicola P. Montaldo
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
| | - Kayla Mae Grooms
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
| | - Sarah L. Fordyce Martin
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
| | - Diana L. Bordin
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
| | - Matthias Bosshard
- Department of Molecular Mechanisms of Disease, University of Zurich, 8057 Zürich, Switzerland
| | - Yunhui Peng
- Computational Biophysics and Bioinformatics, Department of Physics and Astronomy, Clemson University, Clemson, SC 29631, USA
| | - Emil Alexov
- Computational Biophysics and Bioinformatics, Department of Physics and Astronomy, Clemson University, Clemson, SC 29631, USA
| | | | - Nina-Beate Liabakk
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
| | - Gareth J. Sullivan
- Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, 0315 Oslo, Norway
- Hybrid Technology Hub, Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, 0315 Oslo, Norway
| | - Magnar Bjørås
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
- Department of Pathology and Medical Genetics, St. Olavs University Hospital, 7049 Trondheim, Norway
- Department of Microbiology, Oslo University Hospital, Department of Medical Biochemistry, Oslo University Hospital and University of Oslo, 0372 Oslo, Norway
| | | | - Barbara van Loon
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), 7049 Trondheim, Norway
- Department of Molecular Mechanisms of Disease, University of Zurich, 8057 Zürich, Switzerland
- Department of Pathology and Medical Genetics, St. Olavs University Hospital, 7049 Trondheim, Norway
- Corresponding author
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13
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Wang T, Zhang Y, Liu L, Wang Y, Chen H, Fan T, Li J, Xia K, Sun Z. Targeted sequencing and integrative analysis of 3,195 Chinese patients with neurodevelopmental disorders prioritized 26 novel candidate genes. J Genet Genomics 2021; 48:312-323. [PMID: 33994118 DOI: 10.1016/j.jgg.2021.03.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 03/05/2021] [Accepted: 03/07/2021] [Indexed: 02/06/2023]
Abstract
Neurodevelopmental disorders (NDDs) are a set of complex disorders characterized by diverse and co-occurring clinical symptoms. The genetic contribution in patients with NDDs remains largely unknown. Here, we sequence 519 NDD-related genes in 3,195 Chinese probands with neurodevelopmental phenotypes and identify 2,522 putative functional mutations consisting of 137 de novo mutations (DNMs) in 86 genes and 2,385 rare inherited mutations (RIMs) with 22 X-linked hemizygotes in 13 genes, 2 homozygous mutations in 2 genes and 23 compound heterozygous mutations in 10 genes. Furthermore, the DNMs of 16,807 probands with NDDs are retrieved from public datasets and combine in an integrated analysis with the mutation data of our Chinese NDD probands by taking 3,582 in-house controls of Chinese origin as background. We prioritize 26 novel candidate genes. Notably, six of these genes - ITSN1, UBR3, CADM1, RYR3, FLNA, and PLXNA3 - preferably contribute to autism spectrum disorders (ASDs), as demonstrated by high co-expression and/or interaction with ASD genes confirmed via rescue experiments in a mouse model. Importantly, these genes are differentially expressed in the ASD cortex in a significant manner and involved in ASD-associated networks. Together, our study expands the genetic spectrum of Chinese NDDs, further facilitating both basic and translational research.
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Affiliation(s)
- Tao Wang
- Center for Medical Genetics & Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan 410083, China; Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing 100101, China; DIAGenes Precision Medicine, Beijing 102600, China
| | - Yi Zhang
- National Clinical Research Centre for Geriatric Disorders, Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan 410083, China
| | - Liqui Liu
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing 100101, China
| | - Yan Wang
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing 100101, China
| | - Huiqian Chen
- Shanghai Adeptus Biotechnology, Shanghai 200126, China
| | - Tianda Fan
- Institute of Genomic Medicine, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Jinchen Li
- National Clinical Research Centre for Geriatric Disorders, Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan 410083, China; Department of Neurology, Xiangya Hospital, Central South University, Changsha Hunan, 410083, China.
| | - Kun Xia
- Center for Medical Genetics & Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan 410083, China; CAS Center for Excellence in Brain Science and Intelligences Technology (CEBSIT), Shanghai 200031, China; School of Basic Medical Science, Central South University, Changsha, Hunan, 410083, China.
| | - Zhongsheng Sun
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing 100101, China; Institute of Genomic Medicine, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China; CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 100049, China; State Key Laboratory of Integrated Management of Pest Insects and Rodents, Chinese Academy of Sciences, Beijing 100101, China.
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14
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Mahadevaraju S, Fear JM, Akeju M, Galletta BJ, Pinheiro MMLS, Avelino CC, Cabral-de-Mello DC, Conlon K, Dell'Orso S, Demere Z, Mansuria K, Mendonça CA, Palacios-Gimenez OM, Ross E, Savery M, Yu K, Smith HE, Sartorelli V, Yang H, Rusan NM, Vibranovski MD, Matunis E, Oliver B. Dynamic sex chromosome expression in Drosophila male germ cells. Nat Commun 2021; 12:892. [PMID: 33563972 PMCID: PMC7873209 DOI: 10.1038/s41467-021-20897-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 12/22/2020] [Indexed: 01/30/2023] Open
Abstract
Given their copy number differences and unique modes of inheritance, the evolved gene content and expression of sex chromosomes is unusual. In many organisms the X and Y chromosomes are inactivated in spermatocytes, possibly as a defense mechanism against insertions into unpaired chromatin. In addition to current sex chromosomes, Drosophila has a small gene-poor X-chromosome relic (4th) that re-acquired autosomal status. Here we use single cell RNA-Seq on fly larvae to demonstrate that the single X and pair of 4th chromosomes are specifically inactivated in primary spermatocytes, based on measuring all genes or a set of broadly expressed genes in testis we identified. In contrast, genes on the single Y chromosome become maximally active in primary spermatocytes. Reduced X transcript levels are due to failed activation of RNA-Polymerase-II by phosphorylation of Serine 2 and 5.
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Affiliation(s)
- Sharvani Mahadevaraju
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Kidney and Digestive Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Justin M Fear
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Kidney and Digestive Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Miriam Akeju
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD, 21205, USA
| | - Brian J Galletta
- Cell Biology and Physiology Center, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Mara M L S Pinheiro
- Department of Genetics and Evolutionary Biology, Institute of Biosciences, University of São Paulo, SP 05508-090, São Paulo, Brazil
| | - Camila C Avelino
- Department of Genetics and Evolutionary Biology, Institute of Biosciences, University of São Paulo, SP 05508-090, São Paulo, Brazil
| | - Diogo C Cabral-de-Mello
- Instituto de Biociências/IB, Departamento de Biologia Geral e Aplicada, UNESP-Universidade Estadual Paulista, Rio Claro, São Paulo, 13506-900, Brazil
| | - Katie Conlon
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD, 21205, USA
| | - Stafania Dell'Orso
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Zelalem Demere
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD, 21205, USA
| | - Kush Mansuria
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD, 21205, USA
| | - Carolina A Mendonça
- Department of Genetics and Evolutionary Biology, Institute of Biosciences, University of São Paulo, SP 05508-090, São Paulo, Brazil
| | - Octavio M Palacios-Gimenez
- Department of Genetics and Evolutionary Biology, Institute of Biosciences, University of São Paulo, SP 05508-090, São Paulo, Brazil
- Department of Evolutionary Biology and Department of Organismal Biology, Systematic Biology, Evolutionary Biology Centre, Uppsala University, 75236, Uppsala, Sweden
| | - Eli Ross
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD, 21205, USA
| | - Max Savery
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Kidney and Digestive Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Kevin Yu
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD, 21205, USA
| | - Harold E Smith
- Genomics Core, National Institute of Diabetes and Kidney and Digestive Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Vittorio Sartorelli
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Haiwang Yang
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Kidney and Digestive Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
- Department of Pharmacology, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Nasser M Rusan
- Cell Biology and Physiology Center, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Maria D Vibranovski
- Department of Genetics and Evolutionary Biology, Institute of Biosciences, University of São Paulo, SP 05508-090, São Paulo, Brazil
| | - Erika Matunis
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD, 21205, USA
| | - Brian Oliver
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Kidney and Digestive Diseases, National Institutes of Health, Bethesda, MD, 20892, USA.
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15
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Fry AE, Marra C, Derrick AV, Pickrell WO, Higgins AT, Te Water Naude J, McClatchey MA, Davies SJ, Metcalfe KA, Tan HJ, Mohanraj R, Avula S, Williams D, Brady LI, Mesterman R, Tarnopolsky MA, Zhang Y, Yang Y, Wang X, Rees MI, Goldfarb M, Chung SK. Missense variants in the N-terminal domain of the A isoform of FHF2/FGF13 cause an X-linked developmental and epileptic encephalopathy. Am J Hum Genet 2021; 108:176-185. [PMID: 33245860 PMCID: PMC7820623 DOI: 10.1016/j.ajhg.2020.10.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 10/30/2020] [Indexed: 01/22/2023] Open
Abstract
Fibroblast growth factor homologous factors (FHFs) are intracellular proteins which regulate voltage-gated sodium (Nav) channels in the brain and other tissues. FHF dysfunction has been linked to neurological disorders including epilepsy. Here, we describe two sibling pairs and three unrelated males who presented in infancy with intractable focal seizures and severe developmental delay. Whole-exome sequencing identified hemi- and heterozygous variants in the N-terminal domain of the A isoform of FHF2 (FHF2A). The X-linked FHF2 gene (also known as FGF13) has alternative first exons which produce multiple protein isoforms that differ in their N-terminal sequence. The variants were located at highly conserved residues in the FHF2A inactivation particle that competes with the intrinsic fast inactivation mechanism of Nav channels. Functional characterization of mutant FHF2A co-expressed with wild-type Nav1.6 (SCN8A) revealed that mutant FHF2A proteins lost the ability to induce rapid-onset, long-term blockade of the channel while retaining pro-excitatory properties. These gain-of-function effects are likely to increase neuronal excitability consistent with the epileptic potential of FHF2 variants. Our findings demonstrate that FHF2 variants are a cause of infantile-onset developmental and epileptic encephalopathy and underline the critical role of the FHF2A isoform in regulating Nav channel function.
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Affiliation(s)
- Andrew E Fry
- Institute of Medical Genetics, University Hospital of Wales, Cardiff CF14 4XW, UK; Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK.
| | - Christopher Marra
- Department of Biological Sciences, Hunter College of City University, 695 Park Avenue, New York, NY 10065, USA; Program in Biology, Graduate Center of City University, 365 Fifth Avenue, New York, NY 10016, USA
| | - Anna V Derrick
- Neurology and Molecular Neuroscience Research, Institute of Life Science, Swansea University Medical School, Swansea University, Swansea SA2 8PP, UK
| | - William O Pickrell
- Neurology and Molecular Neuroscience Research, Institute of Life Science, Swansea University Medical School, Swansea University, Swansea SA2 8PP, UK; Neurology department, Morriston Hospital, Swansea Bay University Hospital Health Board, Swansea SA6 6NL, UK
| | - Adam T Higgins
- Neurology and Molecular Neuroscience Research, Institute of Life Science, Swansea University Medical School, Swansea University, Swansea SA2 8PP, UK
| | - Johann Te Water Naude
- Paediatric Neurology, University Hospital of Wales, Heath Park, Cardiff CF14 4XW, UK
| | - Martin A McClatchey
- Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - Sally J Davies
- Institute of Medical Genetics, University Hospital of Wales, Cardiff CF14 4XW, UK
| | - Kay A Metcalfe
- Manchester Centre for Genomic Medicine, Manchester University NHS Foundation Trust and Institute of Human Development, University of Manchester, Manchester M13 9WL, UK
| | - Hui Jeen Tan
- Department of Paediatric Neurology, Royal Manchester Children's Hospital, Oxford Road, Manchester M13 9WL, UK
| | - Rajiv Mohanraj
- Department of Neurology, Salford Royal Hospital NHS Foundation Trust, Stott Lane, Salford M6 8HD, UK
| | - Shivaram Avula
- Department of Radiology, Alder Hey Children's NHS Foundation Trust, Eaton Road, Liverpool L12 2AP, UK
| | - Denise Williams
- West Midlands Regional Genetics Service, Clinical Genetics Unit, Birmingham Women's Hospital, Birmingham B15 2TG, UK
| | - Lauren I Brady
- Department of Paediatrics, McMaster University, 1200 Main St. W., Hamilton, ON L8N 3Z5, Canada
| | - Ronit Mesterman
- Department of Paediatrics, McMaster University, 1200 Main St. W., Hamilton, ON L8N 3Z5, Canada
| | - Mark A Tarnopolsky
- Department of Paediatrics, McMaster University, 1200 Main St. W., Hamilton, ON L8N 3Z5, Canada
| | - Yuehua Zhang
- Department of Pediatrics, Peking University First Hospital, Xicheng District, Beijing 100034, China
| | - Ying Yang
- Department of Pediatrics, Peking University First Hospital, Xicheng District, Beijing 100034, China
| | | | - Mark I Rees
- Neurology and Molecular Neuroscience Research, Institute of Life Science, Swansea University Medical School, Swansea University, Swansea SA2 8PP, UK; Faculty of Medicine and Health, Camperdown, University of Sydney, NSW 2006, Australia
| | - Mitchell Goldfarb
- Department of Biological Sciences, Hunter College of City University, 695 Park Avenue, New York, NY 10065, USA; Program in Biology, Graduate Center of City University, 365 Fifth Avenue, New York, NY 10016, USA
| | - Seo-Kyung Chung
- Neurology and Molecular Neuroscience Research, Institute of Life Science, Swansea University Medical School, Swansea University, Swansea SA2 8PP, UK; Kids Neuroscience Centre, Kids Research, Children Hospital at Westmead, Sydney, NSW 2145, Australia; Brain and Mind Centre, Faculty of Medicine and Health, University of Sydney, NSW 2050, Australia
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16
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Tang H, Mao J, Xiang J, Liu M, Li H, Wang T. Whole-exome sequencing identified a novel mutation in CHM of a Chinese family. J Genet 2021; 100:49. [PMID: 34282730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Choroideraemia (CHM) is a rare X-linked progressive-inherited retinal disease. In this study, we diagnosed and explored the genetic cause in a Chinese pedigree exhibiting nyctalopia and decreased visual acuity in early life. Clinical data and peripheral blood samples were collected from available family members. Sanger sequencing of RPGR and RP2 genes, and subsequently whole-exome sequencing was carried out to investigate the molecular cause. The proband was initially diagnosed as retinitis pigmentosa and experienced night blindness at an early age and decreased visual acuity in teens. The other affected males in this family suffered from the same problem. Direct sequencing failed to reveal the genetic cause and hence a novel hemizygous mutation c.861_862insGCTT was detected by WES in CHM gene resulting in a premature stop codon and a truncated protein. Subsequently, it was confirmed by Sanger sequencing and cosegregation analysis. We describe a novel mutation c.861_862insGCTT in CHM gene in a Chinese pedigree with choroideraemia. Our study emphasizes the utilization of next-generation sequencing in the diagnosis and genetic analysis of retinal diseases.
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Affiliation(s)
- Hui Tang
- Center for Reproduction and Genetics, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, Jiangsu, People's Republic of China.
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Abstract
Biological sex is increasingly recognized as a critical determinant of health and disease, particularly relevant to the topical COVID-19 pandemic caused by the SARS-CoV-2 coronavirus. Epidemiological data and observational reports from both the original SARS epidemic and the most recent COVID-19 pandemic have a common feature: males are more likely to exhibit enhanced disease severity and mortality than females. Sex differences in cardiovascular disease and COVID-19 share mechanistic foundations, namely, the involvement of both the innate immune system and the canonical renin-angiotensin system (RAS). Immunological differences suggest that females mount a rapid and aggressive innate immune response, and the attenuated antiviral response in males may confer enhanced susceptibility to severe disease. Furthermore, the angiotensin-converting enzyme 2 (ACE2) is involved in disease pathogenesis in cardiovascular disease and COVID-19, either to serve as a protective mechanism by deactivating the RAS or as the receptor for viral entry, respectively. Loss of membrane ACE2 and a corresponding increase in plasma ACE2 are associated with worsened cardiovascular disease outcomes, a mechanism attributed to a disintegrin and metalloproteinase (ADAM17). SARS-CoV-2 infection also leads to ADAM17 activation, a positive feedback cycle that exacerbates ACE2 loss. Therefore, the relationship between cardiovascular disease and COVID-19 is critically dependent on the loss of membrane ACE2 by ADAM17-mediated proteolytic cleavage. This article explores potential mechanisms involved in COVID-19 that may contribute to sex-specific susceptibility focusing on the innate immune system and the RAS, namely, genetics and sex hormones. Finally, we highlight here the added challenges of gender in the COVID-19 pandemic.
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Affiliation(s)
- Anissa Viveiros
- Department of Physiology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Canada
| | - Jaslyn Rasmuson
- Department of Physiology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
| | - Jennie Vu
- Department of Physiology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
| | - Sharon L Mulvagh
- Division of Cardiology, Dalhousie University, Halifax, Canada
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota
| | - Cindy Y Y Yip
- Heart and Stroke Foundation of Canada, Toronto, Canada
| | - Colleen M Norris
- Division of Cardiology, Dalhousie University, Halifax, Canada
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota
- Faculty of Nursing, University of Alberta, Edmonton, Canada
| | - Gavin Y Oudit
- Division of Cardiology, Department of Medicine, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
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Pasta G, Annunziata S, Polizzi A, Caliogna L, Jannelli E, Minen A, Mosconi M, Benazzo F, Di Minno MND. The Progression of Hemophilic Arthropathy: The Role of Biomarkers. Int J Mol Sci 2020; 21:E7292. [PMID: 33023246 PMCID: PMC7583947 DOI: 10.3390/ijms21197292] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 09/28/2020] [Accepted: 09/30/2020] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Hemophilia A and B are X-linked congenital bleeding disorders characterized by recurrent hemarthroses leading to specific changes in the synovium and cartilage, which finally result in the destruction of the joint: this process is called hemophilic arthropathy (HA). This review highlights the most prominent molecular biomarkers found in the literature to discuss their potential use in the clinical practice to monitor bleeding, to assess the progression of the HA and the effectiveness of treatments. METHODS A review of the literature was performed on PubMed and Embase, from 3 to 7 August 2020. Study selection and data extraction were achieved independently by two authors and the following inclusion criteria were determined a priori: English language, available full text and articles published in peer-reviewed journal. In addition, further articles were identified by checking the bibliography of relevant articles and searching for the studies cited in all the articles examined. RESULTS Eligible studies obtained at the end of the search and screen process were seventy-three (73). CONCLUSIONS Despite the surge of interest in the clinical use of biomarkers, current literature underlines the lack of their standardization and their potential use in the clinical practice preserving the role of physical examination and imaging in early diagnosis.
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Affiliation(s)
- Gianluigi Pasta
- Department of Orthopaedics and Traumatology, Fondazione Policlinico IRCCS San Matteo, University of Pavia, 27100 Pavia, Italy; (G.P.); (A.P.); (L.C.); (E.J.); (A.M.); (M.M.); (F.B.)
| | - Salvatore Annunziata
- Department of Orthopaedics and Traumatology, Fondazione Policlinico IRCCS San Matteo, University of Pavia, 27100 Pavia, Italy; (G.P.); (A.P.); (L.C.); (E.J.); (A.M.); (M.M.); (F.B.)
| | - Alberto Polizzi
- Department of Orthopaedics and Traumatology, Fondazione Policlinico IRCCS San Matteo, University of Pavia, 27100 Pavia, Italy; (G.P.); (A.P.); (L.C.); (E.J.); (A.M.); (M.M.); (F.B.)
| | - Laura Caliogna
- Department of Orthopaedics and Traumatology, Fondazione Policlinico IRCCS San Matteo, University of Pavia, 27100 Pavia, Italy; (G.P.); (A.P.); (L.C.); (E.J.); (A.M.); (M.M.); (F.B.)
| | - Eugenio Jannelli
- Department of Orthopaedics and Traumatology, Fondazione Policlinico IRCCS San Matteo, University of Pavia, 27100 Pavia, Italy; (G.P.); (A.P.); (L.C.); (E.J.); (A.M.); (M.M.); (F.B.)
| | - Alessandro Minen
- Department of Orthopaedics and Traumatology, Fondazione Policlinico IRCCS San Matteo, University of Pavia, 27100 Pavia, Italy; (G.P.); (A.P.); (L.C.); (E.J.); (A.M.); (M.M.); (F.B.)
| | - Mario Mosconi
- Department of Orthopaedics and Traumatology, Fondazione Policlinico IRCCS San Matteo, University of Pavia, 27100 Pavia, Italy; (G.P.); (A.P.); (L.C.); (E.J.); (A.M.); (M.M.); (F.B.)
| | - Francesco Benazzo
- Department of Orthopaedics and Traumatology, Fondazione Policlinico IRCCS San Matteo, University of Pavia, 27100 Pavia, Italy; (G.P.); (A.P.); (L.C.); (E.J.); (A.M.); (M.M.); (F.B.)
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19
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D’Avanzo F, Rigon L, Zanetti A, Tomanin R. Mucopolysaccharidosis Type II: One Hundred Years of Research, Diagnosis, and Treatment. Int J Mol Sci 2020; 21:E1258. [PMID: 32070051 PMCID: PMC7072947 DOI: 10.3390/ijms21041258] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 02/10/2020] [Accepted: 02/11/2020] [Indexed: 12/11/2022] Open
Abstract
Mucopolysaccharidosis type II (MPS II, Hunter syndrome) was first described by Dr. Charles Hunter in 1917. Since then, about one hundred years have passed and Hunter syndrome, although at first neglected for a few decades and afterwards mistaken for a long time for the similar disorder Hurler syndrome, has been clearly distinguished as a specific disease since 1978, when the distinct genetic causes of the two disorders were finally identified. MPS II is a rare genetic disorder, recently described as presenting an incidence rate ranging from 0.38 to 1.09 per 100,000 live male births, and it is the only X-linked-inherited mucopolysaccharidosis. The complex disease is due to a deficit of the lysosomal hydrolase iduronate 2-sulphatase, which is a crucial enzyme in the stepwise degradation of heparan and dermatan sulphate. This contributes to a heavy clinical phenotype involving most organ-systems, including the brain, in at least two-thirds of cases. In this review, we will summarize the history of the disease during this century through clinical and laboratory evaluations that allowed its definition, its correct diagnosis, a partial comprehension of its pathogenesis, and the proposition of therapeutic protocols. We will also highlight the main open issues related to the possible inclusion of MPS II in newborn screenings, the comprehension of brain pathogenesis, and treatment of the neurological compartment.
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Affiliation(s)
- Francesca D’Avanzo
- Laboratory of Diagnosis and Therapy of Lysosomal Disorders, Department of Women’s and Children ‘s Health, University of Padova, Via Giustiniani 3, 35128 Padova, Italy; (F.D.); (A.Z.)
- Fondazione Istituto di Ricerca Pediatrica “Città della Speranza”, Corso Stati Uniti 4, 35127 Padova, Italy;
| | - Laura Rigon
- Fondazione Istituto di Ricerca Pediatrica “Città della Speranza”, Corso Stati Uniti 4, 35127 Padova, Italy;
- Molecular Developmental Biology, Life & Medical Science Institute (LIMES), University of Bonn, 53115 Bonn, Germany
| | - Alessandra Zanetti
- Laboratory of Diagnosis and Therapy of Lysosomal Disorders, Department of Women’s and Children ‘s Health, University of Padova, Via Giustiniani 3, 35128 Padova, Italy; (F.D.); (A.Z.)
- Fondazione Istituto di Ricerca Pediatrica “Città della Speranza”, Corso Stati Uniti 4, 35127 Padova, Italy;
| | - Rosella Tomanin
- Laboratory of Diagnosis and Therapy of Lysosomal Disorders, Department of Women’s and Children ‘s Health, University of Padova, Via Giustiniani 3, 35128 Padova, Italy; (F.D.); (A.Z.)
- Fondazione Istituto di Ricerca Pediatrica “Città della Speranza”, Corso Stati Uniti 4, 35127 Padova, Italy;
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20
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Ibarluzea N, de la Hoz AB, Villate O, Llano I, Ocio I, Martí I, Guitart M, Gabau E, Andrade F, Gener B, Tejada MI. Targeted Next-Generation Sequencing in Patients with Suggestive X-Linked Intellectual Disability. Genes (Basel) 2020; 11:genes11010051. [PMID: 31906484 PMCID: PMC7017351 DOI: 10.3390/genes11010051] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 12/19/2019] [Accepted: 12/30/2019] [Indexed: 12/28/2022] Open
Abstract
X-linked intellectual disability (XLID) is known to contribute up to 10% of intellectual disability (ID) in males and could explain the increased ratio of affected males observed in patients with ID. Over the past decade, next-generation sequencing has clearly stimulated the gene discovery process and has become part of the diagnostic procedure. We have performed targeted next-generation sequencing of 82 XLID genes on 61 non-related male patients with suggestive non-syndromic XLID. These patients were initially referred to the molecular genetics laboratory to exclude Fragile X Syndrome. The cohort includes 47 male patients with suggestive X-linked family history of ID meaning that they had half-brothers or maternal cousins or uncles affected; and 14 male patients with ID and affected brothers whose mothers show skewed X-inactivation. Sequencing data analysis identified 17 candidate variants in 16 patients. Seven families could be re-contacted and variant segregation analysis of the respective eight candidate variants was performed: HUWE1, IQSEC2, MAOA, MED12, PHF8, SLC6A8, SLC9A6, and SYN1. Our results show the utility of targeted next-generation sequencing in unravelling the genetic origin of XLID, especially in retrospective cases. Variant segregation and additional studies like RNA sequencing and biochemical assays also helped in re-evaluating and further classifying the genetic variants found.
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Affiliation(s)
- Nekane Ibarluzea
- Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
- Spanish Consortium for Research on Rare Diseases (CIBERER), 28029 Madrid, Spain
| | - Ana Belén de la Hoz
- Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
- Spanish Consortium for Research on Rare Diseases (CIBERER), 28029 Madrid, Spain
| | - Olatz Villate
- Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
- Spanish Consortium for Research on Rare Diseases (CIBERER), 28029 Madrid, Spain
- Genetics Service, Cruces University Hospital, Osakidetza Basque Health Service, 48903 Barakaldo, Spain
| | - Isabel Llano
- Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
- Spanish Consortium for Research on Rare Diseases (CIBERER), 28029 Madrid, Spain
- Genetics Service, Cruces University Hospital, Osakidetza Basque Health Service, 48903 Barakaldo, Spain
| | - Intzane Ocio
- Department of Paediatric Neurology, Araba University Hospital, Osakidetza Basque Health Service, 01009 Gasteiz, Spain
| | - Itxaso Martí
- Department of Paediatric Neurology, Donostia University Hospital, Osakidetza Basque Health Service, 20014 Donostia, Spain
| | - Miriam Guitart
- Genetics Laboratory, Paediatric Unit, Parc Taulí Hospital Universitari, Institut d’Investigació i Innovació Parc Taulí I3PT, Universitat Autònoma de Barcelona, 08208 Sabadell, Spain
| | - Elisabeth Gabau
- Genetics Laboratory, Paediatric Unit, Parc Taulí Hospital Universitari, Institut d’Investigació i Innovació Parc Taulí I3PT, Universitat Autònoma de Barcelona, 08208 Sabadell, Spain
| | - Fernando Andrade
- Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
- Spanish Consortium for Research on Rare Diseases (CIBERER), 28029 Madrid, Spain
| | - Blanca Gener
- Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
- Spanish Consortium for Research on Rare Diseases (CIBERER), 28029 Madrid, Spain
- Genetics Service, Cruces University Hospital, Osakidetza Basque Health Service, 48903 Barakaldo, Spain
| | - María-Isabel Tejada
- Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
- Spanish Consortium for Research on Rare Diseases (CIBERER), 28029 Madrid, Spain
- Genetics Service, Cruces University Hospital, Osakidetza Basque Health Service, 48903 Barakaldo, Spain
- Correspondence:
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21
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Agopian AJ, Hoang TT, Goldmuntz E, Hakonarson H, Musfee FI, Mitchell LE. X-chromosome association studies of congenital heart defects. Am J Med Genet A 2020; 182:250-254. [PMID: 31729158 PMCID: PMC7539172 DOI: 10.1002/ajmg.a.61411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 10/25/2019] [Accepted: 10/29/2019] [Indexed: 11/08/2022]
Affiliation(s)
- A. J. Agopian
- Human Genetics Center, Department of Epidemiology, Human Genetics, and Environmental Sciences, UTHealth School of Public Health, Houston, Texas
| | - Thanh T. Hoang
- Human Genetics Center, Department of Epidemiology, Human Genetics, and Environmental Sciences, UTHealth School of Public Health, Houston, Texas
| | - Elizabeth Goldmuntz
- Division of Cardiology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
- Department of Pediatrics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Hakon Hakonarson
- Department of Pediatrics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
- Center for Applied Genomics, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Fadi I. Musfee
- Human Genetics Center, Department of Epidemiology, Human Genetics, and Environmental Sciences, UTHealth School of Public Health, Houston, Texas
| | - Laura E. Mitchell
- Human Genetics Center, Department of Epidemiology, Human Genetics, and Environmental Sciences, UTHealth School of Public Health, Houston, Texas
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22
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Shen L, Liu C, Gao M, Li H, Zhang Y, Tian Q, Ni H, Peng P, Zhao R, Hu Z, Gao Y, Xia K, Bo Q, Guo H. Novel mutation of EDA causes new asymmetrical X-linked hypohidrotic ectodermal dysplasia phenotypes in a female. J Dermatol 2019; 46:731-733. [PMID: 31241787 DOI: 10.1111/1346-8138.14978] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Accepted: 05/12/2019] [Indexed: 11/26/2022]
Abstract
Hypohidrotic ectodermal dysplasia (HED) is a rare hereditary disorder that affects tissues derived from the ectoderm including hair, teeth and sweat glands. EDA is the major causative gene of HED. This study recruited a Chinese family with HED, including a male proband and his mother with a fetus. The proband had typical clinical features of HED and the mother had identical but milder features. Interestingly, some phenotypes of the mother appeared asymmetrically between the right and left side of the body that were not reported in previous studies. Targeted sequencing was performed in the proband and a novel frame-shift mutation (NM_001399.4: c.381_382delinsG, p.Q128Rfs*9) in EDA was found. Sanger sequencing validated the mutation and identified the same mutation in the mother. Our study expands the clinical and genetic spectrum of EDA-related disorders and reports new asymmetrical phenotypes in a female.
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Affiliation(s)
- Lu Shen
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Cenying Liu
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Ming Gao
- Center for Reproductive Medicine, Shandong University, Jinan, China
| | - Hongmei Li
- Department of Gynecology and Obstetrics, Dongying People's Hospital, Dongying, China
| | - Yaowen Zhang
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Qi Tian
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Hailun Ni
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Pengwei Peng
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Rongjuan Zhao
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Zhengmao Hu
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Yuan Gao
- Center for Reproductive Medicine, Shandong University, Jinan, China
| | - Kun Xia
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Qifang Bo
- Department of Gynecology and Obstetrics, Dongying People's Hospital, Dongying, China
| | - Hui Guo
- Center for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, China
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23
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Odhams CA, Roberts AL, Vester SK, Duarte CST, Beales CT, Clarke AJ, Lindinger S, Daffern SJ, Zito A, Chen L, Jones LL, Boteva L, Morris DL, Small KS, Fernando MMA, Cunninghame Graham DS, Vyse TJ. Interferon inducible X-linked gene CXorf21 may contribute to sexual dimorphism in Systemic Lupus Erythematosus. Nat Commun 2019; 10:2164. [PMID: 31092820 PMCID: PMC6520347 DOI: 10.1038/s41467-019-10106-2] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 04/11/2019] [Indexed: 12/14/2022] Open
Abstract
Systemic lupus erythematosus (SLE) is an autoimmune disease, characterised by increased expression of type I interferon (IFN)-regulated genes and a striking sex imbalance towards females. Through combined genetic, in silico, in vitro, and ex vivo approaches, we define CXorf21, a gene of hitherto unknown function, which escapes X-chromosome inactivation, as a candidate underlying the Xp21.2 SLE association. We demonstrate that CXorf21 is an IFN-response gene and that the sexual dimorphism in expression is magnified by immunological challenge. Fine-mapping reveals a single haplotype as a potential causal cis-eQTL for CXorf21. We propose that expression is amplified through modification of promoter and 3'-UTR chromatin interactions. Finally, we show that the CXORF21 protein colocalises with TLR7, a pathway implicated in SLE pathogenesis. Our study reveals modulation in gene expression affected by the combination of two hallmarks of SLE: CXorf21 expression increases in a both an IFN-inducible and sex-specific manner.
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Affiliation(s)
- Christopher A Odhams
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
- Genomics England, Queen Mary University of London, Dawson Hall, London, EC1M 6BQ, UK
| | - Amy L Roberts
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
- Department of Twin Research & Genetic Epidemiology, King's College London, London, SE1 7EH, UK
| | - Susan K Vester
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
| | - Carolina S T Duarte
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
| | - Charlie T Beales
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
| | - Alexander J Clarke
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, OX3 7FY, UK
| | - Sonja Lindinger
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
- University of Applied Sciences - FH Campus Wien, Favoritenstrasse 226, 1100, Wien, Austria
- Institute of Biophysics, Johannes Kepler University Linz, Gruberstrasse 40, 4020, Linz, Austria
| | - Samuel J Daffern
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, UK
| | - Antonino Zito
- Department of Twin Research & Genetic Epidemiology, King's College London, London, SE1 7EH, UK
| | - Lingyan Chen
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
- MRC/BHF Cardiovascular Epidemiology Unit, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Leonardo L Jones
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
| | - Lora Boteva
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
- MRC Human Genetics Unit MRC IGMM, University of Edinburgh Western General Hospital, Edinburgh, EH4 2XU, UK
| | - David L Morris
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
| | - Kerrin S Small
- Department of Twin Research & Genetic Epidemiology, King's College London, London, SE1 7EH, UK
| | - Michelle M A Fernando
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK
| | | | - Timothy J Vyse
- Department of Medical & Molecular Genetics, King's College London, London, SE1 9RT, UK.
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24
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Rahman SK, Okazawa H, Chen YW. Frameshift PQBP-1 mutants K192S fs*7 and R153S fs*41 implicated in X-linked intellectual disability form stable dimers. J Struct Biol 2019; 206:305-313. [PMID: 30951824 DOI: 10.1016/j.jsb.2019.04.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 03/30/2019] [Accepted: 04/01/2019] [Indexed: 11/19/2022]
Abstract
Polyglutamine tract-binding protein-1 (PQBP-1) is a nuclear intrinsically disordered protein playing important roles in transcriptional regulation and RNA splicing during embryonic and postembryonic development. In human, its mutations lead to severe cognitive impairment known as the Renpenning syndrome, a form of X-linked intellectual disability (XLID). Here, we report a combined biophysical study of two PQBP-1 frameshift mutants, K192Sfs*7 and R153Sfs*41. Both mutants are dimeric in solution, in contrast to the monomeric wild-type protein. These mutants contain more folded contents and have increased thermal stabilities. Using small-angle X-ray scattering data, we generated three-dimensional envelopes which revealed their overall flat shapes. We also described each mutant using an ensemble model based on a native-like initial pool with a dimeric structural core. PQBP-1 is known to repress transcription by way of interacting with the C-terminal domain of RNA polymerase II, which consists of 52 repeats of a consensus heptapeptide sequence YSPTSPS. We studied the binding of PQBP-1 variants to the labelled peptide which is phosphorylated at positions 2 and 5 (YpSPTpSPS) and found that this interaction is significantly weakened in the two mutants.
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Affiliation(s)
- Shah Kamranur Rahman
- Randall Centre for Cell and Molecular Biophysics, King's College London, Guy's Campus, London SE1 1UL, United Kingdom.
| | - Hitoshi Okazawa
- Department of Neuropathology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan.
| | - Yu Wai Chen
- Randall Centre for Cell and Molecular Biophysics, King's College London, Guy's Campus, London SE1 1UL, United Kingdom.
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25
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Duan JE, Flock K, Jue N, Zhang M, Jones A, Seesi SA, Mandoiu I, Pillai S, Hoffman M, O'Neill R, Zinn S, Govoni K, Reed S, Jiang H, Jiang ZC, Tian XC. Dosage Compensation and Gene Expression of the X Chromosome in Sheep. G3 (Bethesda) 2019; 9:305-314. [PMID: 30482800 PMCID: PMC6325915 DOI: 10.1534/g3.118.200815] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 11/26/2018] [Indexed: 12/20/2022]
Abstract
Ohno's hypothesis predicts that the expression of the single X chromosome in males needs compensatory upregulation to balance its dosage with that of the diploid autosomes. Additionally, X chromosome inactivation ensures that quadruple expression of the two X chromosomes is avoided in females. These mechanisms have been actively studied in mice and humans but lag behind in domestic species. Using RNA sequencing data, we analyzed the X chromosome upregulation in sheep fetal tissues from day 135 of gestation under control, over or restricted maternal diets (100%, 140% and 60% of National Research Council Total Digestible Nutrients), and in conceptuses, juvenile, and adult somatic tissues. By computing the mean expression ratio of all X-linked genes to all autosomal genes (X:A), we found that all samples displayed some levels of X chromosome upregulation. The degrees of X upregulation were not significant (P-value = 0.74) between ovine females and males in the same somatic tissues. Brain, however, displayed complete X upregulation. Interestingly, the male and female reproduction-related tissues exhibited divergent X dosage upregulation. Moreover, expression upregulation of the X chromosome in fetal tissues was not affected by maternal diets. Maternal nutrition, however, did change expression levels of several X-linked genes, such as sex determination genes SOX3 and NR0B1 In summary, our results showed that X chromosome upregulation occurred in nearly all sheep somatic tissues analyzed, thus support Ohno's hypothesis in a new species. However, the levels of upregulation differed by different subgroups of genes such as those that are house-keeping and "dosage-sensitive".
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Affiliation(s)
| | | | - Nathanial Jue
- School of Natural Sciences, California State University, Monterey Bay, Seaside, CA 93955
| | - Mingyuan Zhang
- Department of Animal Science
- Laboratory Animal Center, Guangxi Medical University, Nanning 530021, China
| | | | - Sahar Al Seesi
- Smith College Department of Computer Science, Northampton, MA 01063
- Department of Computer Science
| | | | | | | | - Rachel O'Neill
- Department of Molecular and Cell Biology, and University of Connecticut, Storrs, CT, 06269
| | | | | | | | - Hesheng Jiang
- College of Animal Science and Technology, Guangxi University, Nanning 530004, China, and
| | - Zongliang Carl Jiang
- Department of Animal Science
- School of Animal Science, Louisiana State University, Baton Rouge, LA 70803
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26
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Birtel J, Gliem M, Mangold E, Müller PL, Holz FG, Neuhaus C, Lenzner S, Zahnleiter D, Betz C, Eisenberger T, Bolz HJ, Charbel Issa P. Next-generation sequencing identifies unexpected genotype-phenotype correlations in patients with retinitis pigmentosa. PLoS One 2018; 13:e0207958. [PMID: 30543658 PMCID: PMC6292620 DOI: 10.1371/journal.pone.0207958] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 11/08/2018] [Indexed: 12/13/2022] Open
Abstract
Retinitis pigmentosa (RP) is an inherited degenerative disease causing severe retinal dystrophy and visual impairment mainly with onset in infancy or adolescence. Targeted next-generation sequencing (NGS) has become an efficient tool to encounter the enormous genetic heterogeneity of diverse retinal dystrophies, including RP. To identify disease-causing mutations in unselected, consecutive RP patients, we conducted Sanger sequencing of genes commonly involved in the suspected genetic RP subtype, followed by targeted large-panel NGS if no mutation was identified, or NGS as primary analysis. A high (70%) detection rate of disease-causing mutations was achieved in a large cohort of 116 unrelated patients. About half (48%) of the solved RP cases were explained by mutations in four genes: RPGR, EYS, PRPF31 and USH2A. Overall, 110 different mutations distributed across 30 different genes were detected, and 46 of these mutations were novel. A molecular diagnosis was achieved in the majority (82–100%) of patients if the family history was suggestive for a particular mode of inheritance, but only in 60% in cases of sporadic RP. The diagnostic potential of extensive molecular analysis in a routine setting is also illustrated by the identification of unexpected genotype-phenotype correlations for RP patients with mutations in CRX, CEP290, RPGRIP1, MFSD8. Furthermore, we identified numerous mutations in autosomal dominant (PRPF31, PRPH2, CRX) and X-linked (RPGR) RP genes in patients with sporadic RP. Variants in RP2 and RPGR were also found in female RP patients with apparently sporadic or dominant disease. In summary, this study demonstrates that massively parallel sequencing of all known retinal dystrophy genes is a valuable diagnostic approach for RP patients.
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Affiliation(s)
- Johannes Birtel
- Department of Ophthalmology, University of Bonn, Bonn, Germany
- Center for Rare Diseases Bonn (ZSEB), University of Bonn, Bonn, Germany
| | - Martin Gliem
- Department of Ophthalmology, University of Bonn, Bonn, Germany
- Center for Rare Diseases Bonn (ZSEB), University of Bonn, Bonn, Germany
| | | | - Philipp L. Müller
- Department of Ophthalmology, University of Bonn, Bonn, Germany
- Center for Rare Diseases Bonn (ZSEB), University of Bonn, Bonn, Germany
| | - Frank G. Holz
- Department of Ophthalmology, University of Bonn, Bonn, Germany
- Center for Rare Diseases Bonn (ZSEB), University of Bonn, Bonn, Germany
| | | | | | | | - Christian Betz
- Bioscientia Center for Human Genetics, Ingelheim, Germany
| | | | - Hanno J. Bolz
- Bioscientia Center for Human Genetics, Ingelheim, Germany
- Institute of Human Genetics, University Hospital of Cologne, Cologne, Germany
| | - Peter Charbel Issa
- Department of Ophthalmology, University of Bonn, Bonn, Germany
- Center for Rare Diseases Bonn (ZSEB), University of Bonn, Bonn, Germany
- Oxford Eye Hospital, Oxford University Hospitals NHS Foundation Trust, and Nuffield Laboratory of Ophthalmology, Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom
- * E-mail:
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27
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Yengo L, Visscher PM. Assortative mating on complex traits revisited: Double first cousins and the X-chromosome. Theor Popul Biol 2018; 124:51-60. [PMID: 30316741 PMCID: PMC6296780 DOI: 10.1016/j.tpb.2018.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 09/12/2018] [Accepted: 09/14/2018] [Indexed: 11/23/2022]
Abstract
Mate choice through direct assortment on heritable traits, assortative mating (AM), is predicted in theory to inflate the genetic variance in a population and the correlation between relatives. Here, we revisit the theory of AM, first established in the landmark 1918 paper from RA Fisher, and provide new theory and analytical results. In particular, we shed light on inconsistencies in the literature regarding the correlation between double first cousins under AM and provide a solution. We derive new theory for AM due to X-chromosome loci. We show in the latter case that the inflation of genetic variance induced under AM is twice as large in females compared to males. These two theoretical contributions are verified and illustrated through simulations. We also provide a more general unified framework for the correlation between relatives in a non-inbred population.
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Affiliation(s)
- Loic Yengo
- Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072, Australia.
| | - Peter M Visscher
- Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072, Australia; Queensland Brain Institute, The University of Queensland, Brisbane 4072, Australia
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28
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Cristofoli F, Devriendt K, Davis EE, Van Esch H, Vermeesch JR. Novel CASK mutations in cases with syndromic microcephaly. Hum Mutat 2018; 39:993-1001. [PMID: 29691940 PMCID: PMC5995665 DOI: 10.1002/humu.23536] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 04/13/2018] [Accepted: 04/17/2018] [Indexed: 11/05/2022]
Abstract
Mutations in CASK cause a wide spectrum of phenotypes in humans ranging from mild X-linked intellectual disability to a severe microcephaly (MC) and pontocerebellar hypoplasia syndrome. Nevertheless, predicting pathogenicity and phenotypic consequences of novel CASK mutations through the exclusive consideration of genetic information and population-based data remains a challenge. Using whole exome sequencing, we identified four novel CASK mutations in individuals with syndromic MC. To understand the functional consequences of the different point mutations on the development of MC and cerebellar defects, we established a transient loss-of-function zebrafish model, and demonstrate recapitulation of relevant neuroanatomical phenotypes. Furthermore, we utilized in vivo complementation studies to demonstrate that the three point mutations confer a loss-of-function effect. This work endorses zebrafish as a tractable model to rapidly assess the effect of novel CASK variants on brain development.
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Affiliation(s)
- Francesca Cristofoli
- Laboratory for Cytogenetics and Genome Research, Center for Human Genetics, KU Leuven, Leuven, Belgium
| | - Koen Devriendt
- Center for Human Genetics, University Hospitals Leuven, Leuven, Belgium
| | - Erica E Davis
- Center for Human Disease Modeling, Duke University Medical Center, Durham, North Carolina
| | - Hilde Van Esch
- Center for Human Genetics, University Hospitals Leuven, Leuven, Belgium
- Laboratory for the Genetics of Cognition, Center for Human Genetics, KU Leuven, Leuven, Belgium
| | - Joris R Vermeesch
- Laboratory for Cytogenetics and Genome Research, Center for Human Genetics, KU Leuven, Leuven, Belgium
- Center for Human Genetics, University Hospitals Leuven, Leuven, Belgium
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29
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Lucchesi JC. Transcriptional modulation of entire chromosomes: dosage compensation. J Genet 2018; 97:357-364. [PMID: 29932054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Dosage compensation is a regulatory system designed to equalize the transcription output of the genes of the sex chromosomes that are present in different doses in the sexes (X or Z chromosome, depending on the animal species involved). Different mechanisms of dosage compensation have evolved in different animal groups. In Drosophila males, a complex (male-specific lethal) associates with the X chromosome and enhances the activity of most X-linked genes by increasing the rate of RNAPII elongation. In Caenorhabditis, a complex (dosage compensation complex) that contains a number of proteins involved in condensing chromosomes decreases the level of transcription of both X chromosomes in the XX hermaphrodite. In mammals, dosage compensation is achieved by the inactivation, early during development, of most X-linked genes on one of the two X chromosomes in females. The mechanism involves the synthesis of an RNA (Tsix) that protects one of the two Xs from inactivation, and of another RNA (Xist) that coats the other X chromosome and recruits histone and DNA modifying enzymes. This review will focus on the current progress in understanding the dosage compensation mechanisms in the three taxa where it has been best studied at the molecular level: flies, round worms and mammals.
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Affiliation(s)
- John C Lucchesi
- Department of Biology, Emory University, Atlanta, GA 30322, USA. E-mail:
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30
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Dimitrov B, Himmelreich N, Hipgrave Ederveen AL, Lüchtenborg C, Okun JG, Breuer M, Hutter AM, Carl M, Guglielmi L, Hellwig A, Thiemann KC, Jost M, Peters V, Staufner C, Hoffmann GF, Hackenberg A, Paramasivam N, Wiemann S, Eils R, Schlesner M, Strahl S, Brügger B, Wuhrer M, Christoph Korenke G, Thiel C. Cutis laxa, exocrine pancreatic insufficiency and altered cellular metabolomics as additional symptoms in a new patient with ATP6AP1-CDG. Mol Genet Metab 2018; 123:364-374. [PMID: 29396028 DOI: 10.1016/j.ymgme.2018.01.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/18/2018] [Accepted: 01/18/2018] [Indexed: 02/07/2023]
Abstract
Congenital disorders of glycosylation (CDG) are genetic defects in the glycoconjugate biosynthesis. >100 types of CDG are known, most of them cause multi-organ diseases. Here we describe a boy whose leading symptoms comprise cutis laxa, pancreatic insufficiency and hepatosplenomegaly. Whole exome sequencing identified the novel hemizygous mutation c.542T>G (p.L181R) in the X-linked ATP6AP1, an accessory protein of the mammalian vacuolar H+-ATPase, which led to a general N-glycosylation deficiency. Studies of serum N-glycans revealed reduction of complex sialylated and appearance of truncated diantennary structures. Proliferation of the patient's fibroblasts was significantly reduced and doubling time prolonged. Additionally, there were alterations in the fibroblasts' amino acid levels and the acylcarnitine composition. Especially, short-chain species were reduced, whereas several medium- to long-chain acylcarnitines (C14-OH to C18) were elevated. Investigation of the main lipid classes revealed that total cholesterol was significantly enriched in the patient's fibroblasts at the expense of phophatidylcholine and phosphatidylethanolamine. Within the minor lipid species, hexosylceramide was reduced, while its immediate precursor ceramide was increased. Since catalase activity and ACOX3 expression in peroxisomes were reduced, we assume an ATP6AP1-dependent impact on the β-oxidation of fatty acids. These results help to understand the complex clinical characteristics of this new patient.
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Affiliation(s)
- Bianca Dimitrov
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Nastassja Himmelreich
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Agnes L Hipgrave Ederveen
- Leiden University Medical Center, Center for Proteomics and Metabolomics, Albinusdreef 2, 2333 ZA Leiden, Netherlands
| | - Christian Lüchtenborg
- Heidelberg University Biochemistry Center (BZH), Im Neuenheimer Feld 328, 69120 Heidelberg, Germany
| | - Jürgen G Okun
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Maximilian Breuer
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Anna-Marlen Hutter
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Matthias Carl
- Department of Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany; Laboratory of Translational Neurogenetics, Center for Integrative Biology, University of Trento, 39123 Trento, Italy
| | - Luca Guglielmi
- Department of Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany; Laboratory of Translational Neurogenetics, Center for Integrative Biology, University of Trento, 39123 Trento, Italy
| | - Andrea Hellwig
- Department of Neurobiology, Interdisciplinary Center for Neurosciences, Heidelberg University, Im Neuenheimer Feld 364, 69120 Heidelberg, Germany
| | - Kai Christian Thiemann
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Markus Jost
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Verena Peters
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Christian Staufner
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Georg F Hoffmann
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Annette Hackenberg
- Division of Pediatric Neurology, University Children's Hospital Zürich, Steinwiesstrasse 75, 8032 Zürich, Switzerland
| | - Nagarajan Paramasivam
- Medical Faculty Heidelberg, Heidelberg University, 69120 Heidelberg, Germany; Division of Theoretical Bioinformatics, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany; Bioinformatics and Omics Data Analytics (B240), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Stefan Wiemann
- Genomics & Proteomics Core Facility, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120 Heidelberg, Germany; Division of Molecular Genome Analysis, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120 Heidelberg, Germany
| | - Roland Eils
- Division of Theoretical Bioinformatics, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany; Department for Bioinformatics and Functional Genomics, Institute for Pharmacy and Molecular Biotechnology (IPMB), BioQuant, Heidelberg University, 69120 Heidelberg, Germany; Bioinformatics and Omics Data Analytics (B240), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Matthias Schlesner
- Division of Theoretical Bioinformatics, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany; Bioinformatics and Omics Data Analytics (B240), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Sabine Strahl
- Centre for Organismal Studies (COS), Glycobiology, Heidelberg University, Im Neuenheimer Feld 360, 69120 Heidelberg, Germany
| | - Britta Brügger
- Heidelberg University Biochemistry Center (BZH), Im Neuenheimer Feld 328, 69120 Heidelberg, Germany
| | - Manfred Wuhrer
- Leiden University Medical Center, Center for Proteomics and Metabolomics, Albinusdreef 2, 2333 ZA Leiden, Netherlands
| | - G Christoph Korenke
- Klinikum Oldenburg, Zentrum für Kinder-und Jugendmedizin, Klinik für Neuropädiatrie u. angeborene Stoffwechselerkrankungen, Rahel-Straus-Straße 10, 26133 Oldenburg, Germany
| | - Christian Thiel
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany.
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31
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Asur RS, Kimble DC, Lach FP, Jung M, Donovan FX, Kamat A, Noonan RJ, Thomas JW, Park M, Chines P, Vlachos A, Auerbach AD, Smogorzewska A, Chandrasekharappa SC. Somatic mosaicism of an intragenic FANCB duplication in both fibroblast and peripheral blood cells observed in a Fanconi anemia patient leads to milder phenotype. Mol Genet Genomic Med 2018; 6:77-91. [PMID: 29193904 PMCID: PMC5823675 DOI: 10.1002/mgg3.350] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 09/28/2017] [Accepted: 10/23/2017] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Fanconi anemia (FA) is a rare disorder characterized by congenital malformations, progressive bone marrow failure, and predisposition to cancer. Patients harboring X-linked FANCB pathogenic variants usually present with severe congenital malformations resembling VACTERL syndrome with hydrocephalus. METHODS We employed the diepoxybutane (DEB) test for FA diagnosis, arrayCGH for detection of duplication, targeted capture and next-gen sequencing for defining the duplication breakpoint, PacBio sequencing of full-length FANCB aberrant transcript, FANCD2 ubiquitination and foci formation assays for the evaluation of FANCB protein function by viral transduction of FANCB-null cells with lentiviral FANCB WT and mutant expression constructs, and droplet digital PCR for quantitation of the duplication in the genomic DNA and cDNA. RESULTS We describe here an FA-B patient with a mild phenotype. The DEB diagnostic test for FA revealed somatic mosaicism. We identified a 9154 bp intragenic duplication in FANCB, covering the first coding exon 3 and the flanking regions. A four bp homology (GTAG) present at both ends of the breakpoint is consistent with microhomology-mediated duplication mechanism. The duplicated allele gives rise to an aberrant transcript containing exon 3 duplication, predicted to introduce a stop codon in FANCB protein (p.A319*). Duplication levels in the peripheral blood DNA declined from 93% to 7.9% in the span of eleven years. Moreover, the patient fibroblasts have shown 8% of wild-type (WT) allele and his carrier mother showed higher than expected levels of WT allele (79% vs. 50%) in peripheral blood, suggesting that the duplication was highly unstable. CONCLUSION Unlike sequence point variants, intragenic duplications are difficult to precisely define, accurately quantify, and may be very unstable, challenging the proper diagnosis. The reversion of genomic duplication to the WT allele results in somatic mosaicism and may explain the relatively milder phenotype displayed by the FA-B patient described here.
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Affiliation(s)
- Rajalakshmi S. Asur
- Cancer Genetics and Comparative Genomics BranchNational Human Genome Research InstituteNIHBethesdaMDUSA
| | - Danielle C. Kimble
- Cancer Genetics and Comparative Genomics BranchNational Human Genome Research InstituteNIHBethesdaMDUSA
| | - Francis P. Lach
- Laboratory of Genome MaintenanceThe Rockefeller UniversityNew YorkNYUSA
| | - Moonjung Jung
- Laboratory of Genome MaintenanceThe Rockefeller UniversityNew YorkNYUSA
| | - Frank X. Donovan
- Cancer Genetics and Comparative Genomics BranchNational Human Genome Research InstituteNIHBethesdaMDUSA
| | - Aparna Kamat
- Cancer Genetics and Comparative Genomics BranchNational Human Genome Research InstituteNIHBethesdaMDUSA
| | - Raymond J. Noonan
- Laboratory of Genome MaintenanceThe Rockefeller UniversityNew YorkNYUSA
| | - James W. Thomas
- NIH Intramural Sequencing CenterNational Human Genome Research InstituteNIHRockvilleMDUSA
| | - Morgan Park
- NIH Intramural Sequencing CenterNational Human Genome Research InstituteNIHRockvilleMDUSA
| | - Peter Chines
- Medical Genomics and Metabolic Genetics BranchNational Human Genome Research InstituteNIHBethesdaMDUSA
| | - Adrianna Vlachos
- Hematology/Oncology and Stem Cell TransplantationCohen Children's Medical CenterNew Hyde ParkNYUSA
- The Feinstein Institute for Medical Research of Northwell HealthManhassetNYUSA
| | - Arleen D. Auerbach
- Human Genetics and Hematology ProgramThe Rockefeller UniversityNew YorkNYUSA
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Papa F, Windbichler N, Waterhouse RM, Cagnetti A, D'Amato R, Persampieri T, Lawniczak MKN, Nolan T, Papathanos PA. Rapid evolution of female-biased genes among four species of Anopheles malaria mosquitoes. Genome Res 2017; 27:1536-1548. [PMID: 28747381 PMCID: PMC5580713 DOI: 10.1101/gr.217216.116] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 07/18/2017] [Indexed: 01/09/2023]
Abstract
Understanding how phenotypic differences between males and females arise from the sex-biased expression of nearly identical genomes can reveal important insights into the biology and evolution of a species. Among Anopheles mosquito species, these phenotypic differences include vectorial capacity, as it is only females that blood feed and thus transmit human malaria. Here, we use RNA-seq data from multiple tissues of four vector species spanning the Anopheles phylogeny to explore the genomic and evolutionary properties of sex-biased genes. We find that, in these mosquitoes, in contrast to what has been found in many other organisms, female-biased genes are more rapidly evolving in sequence, expression, and genic turnover than male-biased genes. Our results suggest that this atypical pattern may be due to the combination of sex-specific life history challenges encountered by females, such as blood feeding. Furthermore, female propensity to mate only once in nature in male swarms likely diminishes sexual selection of post-reproductive traits related to sperm competition among males. We also develop a comparative framework to systematically explore tissue- and sex-specific splicing to document its conservation throughout the genus and identify a set of candidate genes for future functional analyses of sex-specific isoform usage. Finally, our data reveal that the deficit of male-biased genes on the X Chromosomes in Anopheles is a conserved feature in this genus and can be directly attributed to chromosome-wide transcriptional regulation that de-masculinizes the X in male reproductive tissues.
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Affiliation(s)
- Francesco Papa
- Section of Genomics and Genetics, Department of Experimental Medicine, University of Perugia, 06132 Perugia, Italy
| | - Nikolai Windbichler
- Department of Life Sciences, Imperial College London, SW7 2AZ London, United Kingdom
| | - Robert M Waterhouse
- University of Geneva Medical School and Swiss Institute of Bioinformatics, 1211 Geneva, Switzerland
- Massachusetts Institute of Technology and the Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02139, USA
- Department of Ecology and Evolution, University of Lausanne, CH-1015 Lausanne, Switzerland
| | - Alessia Cagnetti
- Section of Genomics and Genetics, Department of Experimental Medicine, University of Perugia, 06132 Perugia, Italy
- Polo d'Innovazione di Genomica, Genetica e Biologia, 06132 Perugia, Italy
| | - Rocco D'Amato
- Section of Genomics and Genetics, Department of Experimental Medicine, University of Perugia, 06132 Perugia, Italy
| | - Tania Persampieri
- Section of Genomics and Genetics, Department of Experimental Medicine, University of Perugia, 06132 Perugia, Italy
- Polo d'Innovazione di Genomica, Genetica e Biologia, 06132 Perugia, Italy
| | | | - Tony Nolan
- Department of Life Sciences, Imperial College London, SW7 2AZ London, United Kingdom
| | - Philippos Aris Papathanos
- Section of Genomics and Genetics, Department of Experimental Medicine, University of Perugia, 06132 Perugia, Italy
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Guo G, von Meyenn F, Rostovskaya M, Clarke J, Dietmann S, Baker D, Sahakyan A, Myers S, Bertone P, Reik W, Plath K, Smith A. Epigenetic resetting of human pluripotency. Development 2017; 144:2748-2763. [PMID: 28765214 PMCID: PMC5560041 DOI: 10.1242/dev.146811] [Citation(s) in RCA: 183] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Accepted: 06/09/2017] [Indexed: 12/12/2022]
Abstract
Much attention has focussed on the conversion of human pluripotent stem cells (PSCs) to a more naïve developmental status. Here we provide a method for resetting via transient histone deacetylase inhibition. The protocol is effective across multiple PSC lines and can proceed without karyotype change. Reset cells can be expanded without feeders with a doubling time of around 24 h. WNT inhibition stabilises the resetting process. The transcriptome of reset cells diverges markedly from that of primed PSCs and shares features with human inner cell mass (ICM). Reset cells activate expression of primate-specific transposable elements. DNA methylation is globally reduced to a level equivalent to that in the ICM and is non-random, with gain of methylation at specific loci. Methylation imprints are mostly lost, however. Reset cells can be re-primed to undergo tri-lineage differentiation and germline specification. In female reset cells, appearance of biallelic X-linked gene transcription indicates reactivation of the silenced X chromosome. On reconversion to primed status, XIST-induced silencing restores monoallelic gene expression. The facile and robust conversion routine with accompanying data resources will enable widespread utilisation, interrogation, and refinement of candidate naïve cells.
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Affiliation(s)
- Ge Guo
- Wellcome Trust - Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, UK
| | | | - Maria Rostovskaya
- Wellcome Trust - Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, UK
| | - James Clarke
- Wellcome Trust - Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, UK
| | - Sabine Dietmann
- Wellcome Trust - Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, UK
| | - Duncan Baker
- Centre for Stem Cell Biology, Department of Biomedical Science, University of Sheffield, Sheffield S10 2TN, UK
| | - Anna Sahakyan
- Department of Biological Chemistry, University of California, Los Angeles, CA 90095, USA
- Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA
| | - Samuel Myers
- Wellcome Trust - Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, UK
| | - Paul Bertone
- Wellcome Trust - Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, UK
| | - Wolf Reik
- Wellcome Trust - Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, UK
- Epigenetics Programme, Babraham Institute, Cambridge CB22 3AT, UK
- Wellcome Trust Sanger Institute, Hinxton CB10 1SA, UK
| | - Kathrin Plath
- Department of Biological Chemistry, University of California, Los Angeles, CA 90095, USA
- Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA
| | - Austin Smith
- Wellcome Trust - Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, UK
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK
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Niu Z, Feng Y, Mei L, Sun J, Wang X, Wang J, Hu Z, Dong Y, Chen H, He C, Liu Y, Cai X, Liu X, Jiang L. A novel frameshift mutation of SMPX causes a rare form of X-linked nonsyndromic hearing loss in a Chinese family. PLoS One 2017; 12:e0178384. [PMID: 28542515 PMCID: PMC5444825 DOI: 10.1371/journal.pone.0178384] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 05/11/2017] [Indexed: 01/12/2023] Open
Abstract
X-linked hearing impairment is the rarest form of genetic hearing loss (HL) and represents only a minor fraction of all cases. The aim of this study was to investigate the cause of X-linked inherited sensorineural HL in a four-generation Chinese family. A novel duplication variant (c.217dupA, p.Ile73Asnfs*5) in SMPX was identified by whole-exome sequencing. The frameshift mutation predicted to result in the premature truncation of the SMPX protein was co-segregated with the HL phenotype and was absent in 295 normal controls. Subpopulation screening of the coding exons and flanking introns of SMPX was further performed for 338 Chinese patients with nonsydromic HL by Sanger sequencing, and another two potential causative substitutions (c.238C>A and c.55A>G) in SMPX were identified in additional sporadic cases of congenital deafness. Collectively, this study is the first to report the role of SMPX in Chinese population and identify a novel frameshift mutation in SMPX that causes not only nonsyndromic late-onset progressive HL, but also congenital hearing impairment. Our findings extend the mutation and phenotypic spectrum of the SMPX gene.
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Affiliation(s)
- Zhijie Niu
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, Miami, FL, United States of America
| | - Yong Feng
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
- State Key Laboratory of Medical Genetics, Central South University, Changsha, PR China
| | - Lingyun Mei
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
| | - Jie Sun
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
| | - Xueping Wang
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
| | - Juncheng Wang
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
| | - Zhengmao Hu
- State Key Laboratory of Medical Genetics, Central South University, Changsha, PR China
| | - Yunpeng Dong
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, Miami, FL, United States of America
| | - Hongsheng Chen
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
| | - Chufeng He
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
| | - Yalan Liu
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
| | - Xinzhang Cai
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
| | - Xuezhong Liu
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Department of Otolaryngology (D-48), University of Miami Miller School of Medicine, Miami, FL, United States of America
| | - Lu Jiang
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, PR China
- Key Laboratory of Otolaryngology Major Disease Research of Hunan Province, Changsha, PR China
- * E-mail:
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Grau C, Starkovich M, Azamian MS, Xia F, Cheung SW, Evans P, Henderson A, Lalani SR, Scott DA. Xp11.22 deletions encompassing CENPVL1, CENPVL2, MAGED1 and GSPT2 as a cause of syndromic X-linked intellectual disability. PLoS One 2017; 12:e0175962. [PMID: 28414775 PMCID: PMC5393878 DOI: 10.1371/journal.pone.0175962] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 04/03/2017] [Indexed: 12/27/2022] Open
Abstract
By searching a clinical database of over 60,000 individuals referred for array-based CNV analyses and online resources, we identified four males from three families with intellectual disability, developmental delay, hypotonia, joint hypermobility and relative macrocephaly who carried small, overlapping deletions of Xp11.22. The maximum region of overlap between their deletions spanned ~430 kb and included two pseudogenes, CENPVL1 and CENPVL2, whose functions are not known, and two protein coding genes-the G1 to S phase transition 2 gene (GSPT2) and the MAGE family member D1 gene (MAGED1). Deletions of this ~430 kb region have not been previously implicated in human disease. Duplications of GSPT2 have been documented in individuals with intellectual disability, but the phenotypic consequences of a loss of GSPT2 function have not been elucidated in humans or mouse models. Changes in MAGED1 have not been associated with intellectual disability in humans, but loss of MAGED1 function is associated with neurocognitive and neurobehavioral phenotypes in mice. In all cases, the Xp11.22 deletion was inherited from an unaffected mother. Studies performed on DNA from one of these mothers did not show evidence of skewed X-inactivation. These results suggest that deletions of an ~430 kb region on chromosome Xp11.22 that encompass CENPVL1, CENPVL2, GSPT2 and MAGED1 cause a distinct X-linked syndrome characterized by intellectual disability, developmental delay, hypotonia, joint hypermobility and relative macrocephaly. Loss of GSPT2 and/or MAGED1 function may contribute to the intellectual disability and developmental delay seen in males with these deletions.
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Affiliation(s)
- Christina Grau
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Molly Starkovich
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Mahshid S. Azamian
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Fan Xia
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America
- Baylor Genetics, Houston, Texas, Unite States of America
| | - Sau Wai Cheung
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America
- Baylor Genetics, Houston, Texas, Unite States of America
| | - Patricia Evans
- Departments of Pediatrics and Neurology, University of Texas Southwestern Medical School, Dallas, Texas, United States of America
| | - Alex Henderson
- The Newcastle upon Tyne Hospitals, Newcastle upon Tyne, England
| | - Seema R. Lalani
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Daryl A. Scott
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, United States of America
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Okutman O, Muller J, Skory V, Garnier JM, Gaucherot A, Baert Y, Lamour V, Serdarogullari M, Gultomruk M, Röpke A, Kliesch S, Herbepin V, Aknin I, Benkhalifa M, Teletin M, Bakircioglu E, Goossens E, Charlet-Berguerand N, Bahceci M, Tüttelmann F, Viville ST. A no-stop mutation in MAGEB4 is a possible cause of rare X-linked azoospermia and oligozoospermia in a consanguineous Turkish family. J Assist Reprod Genet 2017; 34:683-694. [PMID: 28401488 DOI: 10.1007/s10815-017-0900-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 03/01/2017] [Indexed: 11/25/2022] Open
Abstract
PURPOSE The purpose of this study was to identify mutations that cause non-syndromic male infertility using whole exome sequencing of family cases. METHODS We recruited a consanguineous Turkish family comprising nine siblings with male triplets; two of the triplets were infertile as well as one younger infertile brother. Whole exome sequencing (WES) performed on two azoospermic brothers identified a mutation in the melanoma antigen family B4 (MAGEB4) gene which was confirmed via Sanger sequencing and then screened for on control groups and unrelated infertile subjects. The effect of the mutation on messenger RNA (mRNA) and protein levels was tested after in vitro cell transfection. Structural features of MAGEB4 were predicted throughout the conserved MAGE domain. RESULTS The novel single-base substitution (c.1041A>T) in the X-linked MAGEB4 gene was identified as a no-stop mutation. The mutation is predicted to add 24 amino acids to the C-terminus of MAGEB4. Our functional studies were unable to detect any effect either on mRNA stability, intracellular localization of the protein, or the ability to homodimerize/heterodimerize with other MAGE proteins. We thus hypothesize that these additional amino acids may affect the proper protein interactions with MAGEB4 partners. CONCLUSION The whole exome analysis of a consanguineous Turkish family revealed MAGEB4 as a possible new X-linked cause of inherited male infertility. This study provides the first clue to the physiological function of a MAGE protein.
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Affiliation(s)
- Ozlem Okutman
- Département Génomique Fonctionnelle et Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
- Institut de Parasitologie et Pathologie Tropicale, EA 7292, Fédération de Médecine Translationelle, Université de Strasbourg, 3 rue Koeberlé, 67000, Strasbourg, France
- Laboratoire de Diagnostic Génétique, UF3472-génétique de l'infertilité, Hôpitaux Universitaires de Strasbourg, 67000, Strasbourg, France
| | - Jean Muller
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
- Laboratoire de Génétique Médicale, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
| | - Valerie Skory
- Département Génomique Fonctionnelle et Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | - Jean Marie Garnier
- Biologie du développement et cellules souches, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | - Angeline Gaucherot
- Médecine translationnelle et neurogénétique, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | - Yoni Baert
- Biology of the Testis, Research Laboratory for Reproduction, Genetics and Regenerative Medicine, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, 1090, Brussels, Belgium
| | - Valérie Lamour
- Département Biologie structurale intégrative, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | | | | | - Albrecht Röpke
- Institute of Human Genetics, University of Münster, Münster, Germany
| | - Sabine Kliesch
- Centre of Reproductive Medicine and Andrology, University of Münster, Münster, Germany
| | | | - Isabelle Aknin
- Reproductive Biology Unit, CHU-Hôpital Nord, Saint-Etienne, France
| | - Moncef Benkhalifa
- Médecine de la Reproduction et Cytogénétique Médicale CHU et Faculté de Médecine, Université de Picardie Jules Verne, 80000, Amiens, France
| | - Marius Teletin
- Département Génomique Fonctionnelle et Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | | | - Ellen Goossens
- Biology of the Testis, Research Laboratory for Reproduction, Genetics and Regenerative Medicine, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, 1090, Brussels, Belgium
| | - Nicolas Charlet-Berguerand
- Médecine translationnelle et neurogénétique, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | | | - Frank Tüttelmann
- Institute of Human Genetics, University of Münster, Münster, Germany
| | - STéphane Viville
- Département Génomique Fonctionnelle et Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France.
- Institut de Parasitologie et Pathologie Tropicale, EA 7292, Fédération de Médecine Translationelle, Université de Strasbourg, 3 rue Koeberlé, 67000, Strasbourg, France.
- Laboratoire de Diagnostic Génétique, UF3472-génétique de l'infertilité, Hôpitaux Universitaires de Strasbourg, 67000, Strasbourg, France.
- Laboratoire de diagnostic génétique, UF3472-génétique de l'infertilité, Nouvel Hôpital Civil, Hôpitaux Universitaires de Strasbourg, 1 place de l'Hôpital, 67091, Strasbourg cedex, France.
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Chaladze G. Heterosexual Male Carriers Could Explain Persistence of Homosexuality in Men: Individual-Based Simulations of an X-Linked Inheritance Model. Arch Sex Behav 2016; 45:1705-1711. [PMID: 27067240 DOI: 10.1007/s10508-016-0742-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 09/30/2015] [Accepted: 03/15/2016] [Indexed: 06/05/2023]
Abstract
Homosexuality has been documented throughout history and is found in almost all human cultures. Twin studies suggest that homosexuality is to some extent heritable. However, from an evolutionary perspective, this poses a problem: Male homosexuals tend to have on average five times fewer children than heterosexual males, so how can a phenomenon associated with low reproductive success be maintained at relatively stable frequencies? Recent findings of increased maternal fecundity of male homosexuals suggest that the genes responsible for homosexuality in males increase fecundity in the females who carry them. Can an increase in maternal fecundity compensate for the fecundity reduction in homosexual men and produce a stable polymorphism? In the current study, this problem was addressed with an individual-based modeling (IBM) approach. IBM suggests that male homosexuality can be maintained in a population at low and stable frequencies if roughly more than half of the females and half of the males are carriers of genes that predispose the male to homosexuality.
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Affiliation(s)
- Giorgi Chaladze
- Institute of Ecology, Ilia State University, 3/5 Cholokashvili Ave, 0162, Tbilisi, Georgia.
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Linger RJ, Belikoff EJ, Scott MJ. Dosage Compensation of X-Linked Muller Element F Genes but Not X-Linked Transgenes in the Australian Sheep Blowfly. PLoS One 2015; 10:e0141544. [PMID: 26506426 PMCID: PMC4624761 DOI: 10.1371/journal.pone.0141544] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 10/10/2015] [Indexed: 11/25/2022] Open
Abstract
In most animals that have X and Y sex chromosomes, chromosome-wide mechanisms are used to balance X-linked gene expression in males and females. In the fly Drosophila melanogaster, the dosage compensation mechanism also generally extends to X-linked transgenes. Over 70 transgenic lines of the Australian sheep blowfly Lucilia cuprina have been made as part of an effort to develop male-only strains for a genetic control program of this major pest of sheep. All lines carry a constitutively expressed fluorescent protein marker gene. In all 12 X-linked lines, female larvae show brighter fluorescence than male larvae, suggesting the marker gene is not dosage compensated. This has been confirmed by quantitative RT-PCR for selected lines. To determine if endogenous X-linked genes are dosage compensated, we isolated 8 genes that are orthologs of genes that are on the fourth chromosome in D. melanogaster. Recent evidence suggests that the D. melanogaster fourth chromosome, or Muller element F, is the ancestral X chromosome in Diptera that has reverted to an autosome in Drosophila species. We show by quantitative PCR of male and female DNA that 6 of the 8 linkage group F genes reside on the X chromosome in L. cuprina. The other two Muller element F genes were found to be autosomal in L. cuprina, whereas two Muller element B genes were found on the same region of the X chromosome as the L. cuprina orthologs of the D. melanogaster Ephrin and gawky genes. We find that the L. cuprina X chromosome genes are equally expressed in males and females (i.e., fully dosage compensated). Thus, unlike in Drosophila, it appears that the Lucilia dosage compensation system is specific for genes endogenous to the X chromosome and cannot be co-opted by recently arrived transgenes.
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Affiliation(s)
- Rebecca J. Linger
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695–7613, United States of America
| | - Esther J. Belikoff
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695–7613, United States of America
| | - Maxwell J. Scott
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695–7613, United States of America
- * E-mail:
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Lunetta KL, Day FR, Sulem P, Ruth KS, Tung JY, Hinds DA, Esko T, Elks CE, Altmaier E, He C, Huffman JE, Mihailov E, Porcu E, Robino A, Rose LM, Schick UM, Stolk L, Teumer A, Thompson DJ, Traglia M, Wang CA, Yerges-Armstrong LM, Antoniou AC, Barbieri C, Coviello AD, Cucca F, Demerath EW, Dunning AM, Gandin I, Grove ML, Gudbjartsson DF, Hocking LJ, Hofman A, Huang J, Jackson RD, Karasik D, Kriebel J, Lange EM, Lange LA, Langenberg C, Li X, Luan J, Mägi R, Morrison AC, Padmanabhan S, Pirie A, Polasek O, Porteous D, Reiner AP, Rivadeneira F, Rudan I, Sala CF, Schlessinger D, Scott RA, Stöckl D, Visser JA, Völker U, Vozzi D, Wilson JG, Zygmunt M, Boerwinkle E, Buring JE, Crisponi L, Easton DF, Hayward C, Hu FB, Liu S, Metspalu A, Pennell CE, Ridker PM, Strauch K, Streeten EA, Toniolo D, Uitterlinden AG, Ulivi S, Völzke H, Wareham NJ, Wellons M, Franceschini N, Chasman DI, Thorsteinsdottir U, Murray A, Stefansson K, Murabito JM, Ong KK, Perry JRB. Rare coding variants and X-linked loci associated with age at menarche. Nat Commun 2015; 6:7756. [PMID: 26239645 PMCID: PMC4538850 DOI: 10.1038/ncomms8756] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 06/06/2015] [Indexed: 01/03/2023] Open
Abstract
More than 100 loci have been identified for age at menarche by genome-wide association studies; however, collectively these explain only ∼3% of the trait variance. Here we test two overlooked sources of variation in 192,974 European ancestry women: low-frequency protein-coding variants and X-chromosome variants. Five missense/nonsense variants (in ALMS1/LAMB2/TNRC6A/TACR3/PRKAG1) are associated with age at menarche (minor allele frequencies 0.08-4.6%; effect sizes 0.08-1.25 years per allele; P<5 × 10(-8)). In addition, we identify common X-chromosome loci at IGSF1 (rs762080, P=9.4 × 10(-13)) and FAAH2 (rs5914101, P=4.9 × 10(-10)). Highlighted genes implicate cellular energy homeostasis, post-transcriptional gene silencing and fatty-acid amide signalling. A frequently reported mutation in TACR3 for idiopathic hypogonatrophic hypogonadism (p.W275X) is associated with 1.25-year-later menarche (P=2.8 × 10(-11)), illustrating the utility of population studies to estimate the penetrance of reportedly pathogenic mutations. Collectively, these novel variants explain ∼0.5% variance, indicating that these overlooked sources of variation do not substantially explain the 'missing heritability' of this complex trait.
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Affiliation(s)
- Kathryn L. Lunetta
- Boston University School of Public Health, Department of Biostatistics, Boston, Massachusetts 02118, USA
- NHLBI's and Boston University's Framingham Heart Study, Framingham, Massachusetts 01702-5827, USA
| | - Felix R. Day
- MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Box 285 Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK
| | - Patrick Sulem
- deCODE genetics/Amgen, Inc., Reykjavik IS-101, Iceland
| | - Katherine S. Ruth
- Genetics of Complex Traits, University of Exeter Medical School, University of Exeter, Exeter EX1 2LU, UK
| | - Joyce Y. Tung
- 23andMe Inc., 1390 Shorebird Way, Mountain View, California 94043, USA
| | - David A. Hinds
- 23andMe Inc., 1390 Shorebird Way, Mountain View, California 94043, USA
| | - Tõnu Esko
- Estonian Genome Center, University of Tartu, Tartu 51010, Estonia
- Division of Endocrinology, Boston Children's Hospital, Boston, MA 02115, USA
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
- Broad Institute of the Massachusetts Institute of Technology and Harvard University, 140, Cambridge, MA 02142, USA
| | - Cathy E. Elks
- MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Box 285 Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK
| | - Elisabeth Altmaier
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum München–German Research Center for Environmental Health, Neuherberg 85764, Germany
- Institute of Genetic Epidemiology, Helmholtz Zentrum München–German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Chunyan He
- Department of Epidemiology, Indiana University Richard M. Fairbanks School of Public Health, Indianapolis, IN 46202, USA
- Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN 46202, USA
| | - Jennifer E. Huffman
- Medical Research Council Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Evelin Mihailov
- Estonian Genome Center, University of Tartu, Tartu 51010, Estonia
| | - Eleonora Porcu
- Institute of Genetics and Biomedical Research, National Research Council, Cagliari, Sardinia 09042, Italy
- University of Sassari, Department of Biomedical Sciences, Sassari, Sassari 07100, Italy
- Center for Statistical Genetics, Ann Arbor, University of Michigan, Michigan 48109-2029, USA
| | - Antonietta Robino
- Institute for Maternal and Child Health—IRCCS “Burlo Garofolo”, Trieste 34137, Italy
| | - Lynda M. Rose
- Division of Preventive Medicine, Brigham and Women's Hospital, Boston, MA 02215
| | - Ursula M. Schick
- Fred Hutchinson Cancer Research Center, Public Health Sciences Division, Seattle, WA 98109-1024, USA
| | - Lisette Stolk
- Department of Internal Medicine, Erasmus MC, Rotterdam 3015GE, the Netherlands
| | - Alexander Teumer
- Institute for Community Medicine, University Medicine Greifswald, Greifswald 17475, Germany
| | - Deborah J. Thompson
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, CB1 8RN, UK
| | - Michela Traglia
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano 20132, Italy
| | - Carol A. Wang
- School of Women's and Infants' Health, The University of Western Australia, WA-6009, Australia
| | - Laura M. Yerges-Armstrong
- Program in Personalized Medicine, Division of Endocrinology, Diabetes and Nutrition—University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Antonis C. Antoniou
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, CB1 8RN, UK
| | - Caterina Barbieri
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano 20132, Italy
| | - Andrea D. Coviello
- Boston University School of Medicine, Department of Medicine, Sections of Preventive Medicine and Endocrinology, Boston, MA, USA
| | - Francesco Cucca
- Institute of Genetics and Biomedical Research, National Research Council, Cagliari, Sardinia 09042, Italy
- University of Sassari, Department of Biomedical Sciences, Sassari, Sassari 07100, Italy
| | - Ellen W. Demerath
- Division of Epidemiology & Community Health, University of Minnesotta, Minneapolis, MN 55455, USA
| | - Alison M. Dunning
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge CB1 8RN, UK
| | - Ilaria Gandin
- Institute for Maternal and Child Health—IRCCS “Burlo Garofolo”, Trieste 34137, Italy
- Department of Clinical Medical Sciences, Surgical and Health, University of Trieste, Trieste 34149, Italy
| | - Megan L. Grove
- Human Genetics Center, School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Daniel F. Gudbjartsson
- deCODE genetics/Amgen, Inc., Reykjavik IS-101, Iceland
- School of Engineering and Natural Sciences, University of Iceland, Reykjavik IS-101, Iceland
| | - Lynne J. Hocking
- Musculoskeletal Research Programme, Division of Applied Medicine, University of Aberdeen, Aberdeen AB25 2ZD, UK
| | - Albert Hofman
- Genetic Epidemiology Unit Department of Epidemiology, Erasmus MC, Rotterdam 3015 GE, the Netherlands
| | - Jinyan Huang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Rebecca D. Jackson
- Department of Internal Medicine, The Ohio State University, Columbus, Ohio 43210, USA
| | - David Karasik
- Hebrew SeniorLife Institute for Aging Research, Boston, MA 02131, USA
- Harvard Medical School, Boston, MA 02115, USA
| | - Jennifer Kriebel
- Research Unit of Molecular Epidemiology, Helmholtz Zentrum München–German Research Center for Environmental Health, Neuherberg 85764, Germany
- German Center for Diabetes Research, Neuherberg 85764, Germany
| | - Ethan M. Lange
- Department of Genetics, University of North Carolina, Chapel Hill, NC 27599, USA
- Department of Biostatistics, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Leslie A. Lange
- Department of Genetics, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Claudia Langenberg
- MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Box 285 Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK
| | - Xin Li
- Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA
| | - Jian'an Luan
- MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Box 285 Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK
| | - Reedik Mägi
- Estonian Genome Center, University of Tartu, Tartu 51010, Estonia
| | - Alanna C. Morrison
- Human Genetics Center, School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Sandosh Padmanabhan
- British Heart Foundation Glasgow Cardiovascular Research Centre, Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8TA, UK
| | - Ailith Pirie
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, CB1 8RN, UK
| | - Ozren Polasek
- Faculty of Medicine, University of Split, Split, Croatia
| | - David Porteous
- Medical Genetics Section, Centre for Genomic and Experimental Medicine, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Alex P. Reiner
- Fred Hutchinson Cancer Research Center, Public Health Sciences Division, Seattle, WA 98109-1024, USA
| | - Fernando Rivadeneira
- Department of Internal Medicine, Erasmus MC, Rotterdam 3015GE, the Netherlands
- Genetic Epidemiology Unit Department of Epidemiology, Erasmus MC, Rotterdam 3015 GE, the Netherlands
| | - Igor Rudan
- Institute for Population Health Sciences and Informatics, University of Edinburgh, Teviot Place, Edinburgh EH8 9AG, Scotland
| | - Cinzia F. Sala
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano 20132, Italy
| | - David Schlessinger
- National Institute on Aging, Intramural Research Program, Baltimore, MD 20892, USA
| | - Robert A. Scott
- MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Box 285 Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK
| | - Doris Stöckl
- Institute of Epidemiology II, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Jenny A. Visser
- Department of Internal Medicine, Erasmus MC, Rotterdam 3015GE, the Netherlands
| | - Uwe Völker
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald 17475, Germany
| | - Diego Vozzi
- Institute for Maternal and Child Health—IRCCS “Burlo Garofolo”, Trieste 34137, Italy
| | - James G. Wilson
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Marek Zygmunt
- Department of Obstetrics and Gynecology, University Medicine Greifswald, Greifswald 17475, Germany
| | - Eric Boerwinkle
- Human Genetics Center, School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Julie E. Buring
- Division of Preventive Medicine, Brigham and Women's Hospital, Boston, MA 02215
- Harvard Medical School, Boston, MA 02115, USA
| | - Laura Crisponi
- Institute of Genetics and Biomedical Research, National Research Council, Cagliari, Sardinia 09042, Italy
| | - Douglas F. Easton
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, CB1 8RN, UK
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge CB1 8RN, UK
| | - Caroline Hayward
- Medical Research Council Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Frank B. Hu
- Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
- Department of Nutrition, Harvard School of Public Health, Boston, MA 02115, USA
| | - Simin Liu
- Departments of Epidemiology and Medicine Brown University, Brown University, Providence, RI 02912, USA
| | - Andres Metspalu
- Estonian Genome Center, University of Tartu, Tartu 51010, Estonia
- Institute of Molecular and Cell Biology, University of Tartu, Tartu 51010, Estonia
| | - Craig E. Pennell
- School of Women's and Infants' Health, The University of Western Australia, WA-6009, Australia
| | - Paul M. Ridker
- Division of Preventive Medicine, Brigham and Women's Hospital, Boston, MA 02215
- Harvard Medical School, Boston, MA 02115, USA
| | - Konstantin Strauch
- Institute of Genetic Epidemiology, Helmholtz Zentrum München–German Research Center for Environmental Health, Neuherberg 85764, Germany
- Institute of Medical Informatics, Biometry and Epidemiology, Chair of Genetic Epidemiology, Ludwig-Maximilians-Universität, Munich 81377, Germany
| | - Elizabeth A. Streeten
- Program in Personalized Medicine, Division of Endocrinology, Diabetes and Nutrition—University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Daniela Toniolo
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano 20132, Italy
| | - André G. Uitterlinden
- Department of Internal Medicine, Erasmus MC, Rotterdam 3015GE, the Netherlands
- Genetic Epidemiology Unit Department of Epidemiology, Erasmus MC, Rotterdam 3015 GE, the Netherlands
| | - Sheila Ulivi
- Institute for Maternal and Child Health—IRCCS “Burlo Garofolo”, Trieste 34137, Italy
| | - Henry Völzke
- Institute for Community Medicine, University Medicine Greifswald, Greifswald 17475, Germany
| | - Nicholas J. Wareham
- MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Box 285 Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK
| | - Melissa Wellons
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37203, USA
| | - Nora Franceschini
- Department of Epidemiology, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Daniel I. Chasman
- Division of Preventive Medicine, Brigham and Women's Hospital, Boston, MA 02215
- Harvard Medical School, Boston, MA 02115, USA
| | - Unnur Thorsteinsdottir
- deCODE genetics/Amgen, Inc., Reykjavik IS-101, Iceland
- Faculty of Medicine, University of Iceland, Reykjavik IS-101, Iceland
| | - Anna Murray
- Genetics of Complex Traits, University of Exeter Medical School, University of Exeter, Exeter EX1 2LU, UK
| | - Kari Stefansson
- deCODE genetics/Amgen, Inc., Reykjavik IS-101, Iceland
- Faculty of Medicine, University of Iceland, Reykjavik IS-101, Iceland
| | - Joanne M. Murabito
- NHLBI's and Boston University's Framingham Heart Study, Framingham, Massachusetts 01702-5827, USA
- Boston University School of Medicine, Department of Medicine, Section of General Internal Medicine, Boston, MA 02118, USA
| | - Ken K. Ong
- MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Box 285 Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK
- Department of Paediatrics, University of Cambridge, Cambridge CB2 0QQ, UK
| | - John R. B. Perry
- MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Box 285 Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK
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Murgiano L, Shirokova V, Welle MM, Jagannathan V, Plattet P, Oevermann A, Pienkowska-Schelling A, Gallo D, Gentile A, Mikkola M, Drögemüller C. Hairless Streaks in Cattle Implicate TSR2 in Early Hair Follicle Formation. PLoS Genet 2015. [PMID: 26203908 PMCID: PMC4512707 DOI: 10.1371/journal.pgen.1005427] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Four related cows showed hairless streaks on various parts of the body with no correlation to the pigmentation pattern. The stripes occurred in a consistent pattern resembling the lines of Blaschko. The non-syndromic hairlessness phenotype observed occurred across three generations of a single family and was compatible with an X-linked mode of inheritance. Linkage analysis and subsequent whole genome sequencing of one affected female identified two perfectly associated non-synonymous sequence variants in the critical interval on bovine chromosome X. Both variants occurred in complete linkage disequilibrium and were absent in more than 3900 controls. An ERCC6L missense mutation was predicted to cause an amino acid substitution of a non-conserved residue. Analysis in mice showed no specific Ercc6l expression pattern related to hair follicle development and therefore ERCC6L was not considered as causative gene. A point mutation at the 5'-splice junction of exon 5 of the TSR2, 20S rRNA accumulation, homolog (S. cerevisiae), gene led to the production of two mutant transcripts, both of which contain a frameshift and generate a premature stop codon predicted to truncate approximately 25% of the protein. Interestingly, in addition to the presence of both physiological TSR2 transcripts, the two mutant transcripts were predominantly detected in the hairless skin of the affected cows. Immunohistochemistry, using an antibody against the N-terminal part of the bovine protein demonstrated the specific expression of the TSR2 protein in the skin and the hair of the affected and the control cows as well as in bovine fetal skin and hair. The RNA hybridization in situ showed that Tsr2 was expressed in pre- and post-natal phases of hair follicle development in mice. Mammalian TSR2 proteins are highly conserved and are known to be broadly expressed, but their precise in vivo functions are poorly understood. Thus, by dissecting a naturally occurring mutation in a domestic animal species, we identified TSR2 as a regulator of hair follicle development. The identification of causal mutations of rare monogenic disorders provides an insight into the function of single genes. We herein report an example which demonstrates that the bovine species presents an excellent system for identifying these inherited phenotypes. The individual health status of modern dairy cows is well monitored, and emerging disorders are routinely recorded. An Italian breeder of ~500 Pezzata Rossa cattle reported a case of congenital streaked hairlessness. Three additional, closely related cows, showing similar hairless pattern following Blaschko’s lines were subsequently observed. A causative mutation was discovered in a previously uncharacterized rRNA processing gene. Cows possessing a single copy of this TSR2 mutation located on the X chromosome showed a mosaic skin pattern which is very likely due to the skewed inactivation of the X-chromosome, also known as lyonization. The expression of TSR2 was shown in skin and hair of cattle and mice. This study is the first to implicate an essential role for TSR2 during hair follicle development and reflects once more the potential of using rare diseases in cows to gain additional insights into mammalian biology.
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Affiliation(s)
- Leonardo Murgiano
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
| | - Vera Shirokova
- Developmental Biology Program, Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Monika Maria Welle
- DermFocus, University of Bern, Bern, Switzerland
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Vidhya Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
| | - Philippe Plattet
- Division of Neurological Sciences, DCR-VPH, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Anna Oevermann
- Division of Neurological Sciences, DCR-VPH, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | | | - Daniele Gallo
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell’Emilia, Italy
| | - Arcangelo Gentile
- Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell’Emilia, Italy
| | - Marja Mikkola
- Developmental Biology Program, Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Cord Drögemüller
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, University of Bern, Bern, Switzerland
- * E-mail:
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Abstract
Sex chromosomes have a large effect on reproductive isolation and play an important role in hybrid inviability. In Drosophila hybrids, X-linked genes have pronounced deleterious effects on fitness in male hybrids, which have only one X chromosome. Several studies have succeeded at locating and identifying recessive X-linked alleles involved in hybrid inviability. Nonetheless, the density of dominant X-linked alleles involved in interspecific hybrid viability remains largely unknown. In this report, we study the effects of a panel of small fragments of the D. melanogaster X-chromosome carried on the D. melanogaster Y-chromosome in three kinds of hybrid males: D. melanogaster/D. santomea, D. melanogaster/D. simulans and D. melanogaster/D. mauritiana. D. santomea and D. melanogaster diverged over 10 million years ago, while D. simulans (and D. mauritiana) diverged from D. melanogaster over 3 million years ago. We find that the X-chromosome from D. melanogaster carries dominant alleles that are lethal in mel/san, mel/sim, and mel/mau hybrids, and more of these alleles are revealed in the most divergent cross. We then compare these effects on hybrid viability with two D. melanogaster intraspecific crosses. Unlike the interspecific crosses, we found no X-linked alleles that cause lethality in intraspecific crosses. Our results reveal the existence of dominant alleles on the X-chromosome of D. melanogaster which cause lethality in three different interspecific hybrids. These alleles only cause inviability in hybrid males, yet have little effect in hybrid females. This suggests that X-linked elements that cause hybrid inviability in males might not do so in hybrid females due to differing sex chromosome interactions.
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Affiliation(s)
- Daniel R. Matute
- Department of Human Genetics, The University of Chicago, Chicago, Illinois, United States of America
- The Chicago Fellows Program, The University of Chicago, Chicago, Illinois, United States of America
- * E-mail:
| | - Jackie Gavin-Smyth
- The Chicago Fellows Program, The University of Chicago, Chicago, Illinois, United States of America
- Ecology and Evolution, The University of Chicago, Chicago, Illinois, United States of America
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Borra VM, Steenackers E, de Freitas F, Van Hul E, Glass I, Van Hul W. Localization of the gene for X-linked calvarial hyperostosis to chromosome Xq27.3-Xqter. Bone 2014; 58:67-71. [PMID: 24145306 DOI: 10.1016/j.bone.2013.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 09/23/2013] [Accepted: 10/14/2013] [Indexed: 10/26/2022]
Abstract
X-linked calvarial hyperostosis is a rare disorder characterized by isolated calvarial thickening. Symptoms are prominent frontoparietal bones, a flat nasal root and a short upturned nose, a high forehead with ridging of the metopic and sagittal sutures, and lateral frontal prominences. The mandible is normal, as are the clavicles, pelvis and long bones. The thickened bone in the skull appears to be softer than normal bone. Despite calvarial hyperostosis, increased intracranial pressure and cranial nerve entrapment do not occur. The major disability seems to be cosmetic. The disease segregates with an X-linked recessive mode of inheritance. Female carriers do not show any clinical symptoms. To date, only one family has been described with X-linked calvarial hyperostosis including three affected individuals. In order to localize the disease causing gene, 31 polymorphic microsatellite markers that spread across the X-chromosome were analyzed. Genotypes were combined in haplotypes to delineate the region. A chromosomal region spanning from Xq27.3 to Xqter cosegregates with the disorder. This region encompasses 23.53cM or 8.2Mb according to the deCODE map and contains 165 genes. CNV-analysis did not show small duplications or deletions in this region. Exome sequencing was performed on a male patient in this family. However, this did not reveal any putative mutation. These results indicate that a non-coding regulatory sequence might be involved in the pathogenesis of this disorder.
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Affiliation(s)
- V M Borra
- Department of Medical Genetics, University of Antwerp, Belgium
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43
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Abstract
Genetic factors play an important etiologic role in destructive periodontal diseases. There have been reports that sex chromosomes, especially disorders associated with the X chromosome, affect periodontal health. Although numerous X-linked diseases have been reported to be associated with various periodontal diseases, the association of gingivitis and/or periodontitis with these genetic syndromes should be considered tenuous and raises the question of whether the periodontal manifestation truly arises from an underlying X-linked genetic etiology. A brief overview of genetics in relation to sex chromosomes and putative X-linked genetic periodontal diseases is given.
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44
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Feng Y, Li L, Li X, Wang G, Li J, Liu Q. [Clinical and genetic analysis of a Chinese family affected with X-linked Charcot-Marie-Tooth disease]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2013; 30:659-61. [PMID: 24327141 DOI: 10.3760/cma.j.issn.1003-9406.2013.06.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE To study the clinical manifestations and identify causative mutations for a Chinese family affected with X-linked Charcot-Marie-Tooth disease. METHODS Clinical, electrophysiological and pathological features of the family were carefully analyzed by neurologists. Blood samples were obtained from the proband and other family members. Genomic DNA was extracted. Mutation analysis of GJB1 gene was analyzed with PCR and direct sequencing. RESULTS The family has fit with X-linked inheritance, and the affected individuals have typical clinical manifestations. A c.614A>G (p.Asn205Ser) mutation was detected in the GJB1 gene in all affected individuals in the family. CONCLUSION A c.614A>G (p.Asn205Ser) mutation of GJB1 gene is co-segregated with the disease phenotype in this family and probably underlies the disease.
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Affiliation(s)
- Yapei Feng
- Key Laboratory for Experimental Teratology of Ministry of Education and Department of Medical Genetics, Shandong University School of Medicine, Jinan, Shandong 250012, P.R. China.
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Yu HC, Sloan JL, Scharer G, Brebner A, Quintana AM, Achilly NP, Manoli I, Coughlin CR, Geiger EA, Schneck U, Watkins D, Suormala T, Van Hove JLK, Fowler B, Baumgartner MR, Rosenblatt DS, Venditti CP, Shaikh TH. An X-linked cobalamin disorder caused by mutations in transcriptional coregulator HCFC1. Am J Hum Genet 2013; 93:506-14. [PMID: 24011988 DOI: 10.1016/j.ajhg.2013.07.022] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 07/09/2013] [Accepted: 07/26/2013] [Indexed: 12/31/2022] Open
Abstract
Derivatives of vitamin B12 (cobalamin) are essential cofactors for enzymes required in intermediary metabolism. Defects in cobalamin metabolism lead to disorders characterized by the accumulation of methylmalonic acid and/or homocysteine in blood and urine. The most common inborn error of cobalamin metabolism, combined methylmalonic acidemia and hyperhomocysteinemia, cblC type, is caused by mutations in MMACHC. However, several individuals with presumed cblC based on cellular and biochemical analysis do not have mutations in MMACHC. We used exome sequencing to identify the genetic basis of an X-linked form of combined methylmalonic acidemia and hyperhomocysteinemia, designated cblX. A missense mutation in a global transcriptional coregulator, HCFC1, was identified in the index case. Additional male subjects were ascertained through two international diagnostic laboratories, and 13/17 had one of five distinct missense mutations affecting three highly conserved amino acids within the HCFC1 kelch domain. A common phenotype of severe neurological symptoms including intractable epilepsy and profound neurocognitive impairment, along with variable biochemical manifestations, was observed in all affected subjects compared to individuals with early-onset cblC. The severe reduction in MMACHC mRNA and protein within subject fibroblast lines suggested a role for HCFC1 in transcriptional regulation of MMACHC, which was further supported by the identification of consensus HCFC1 binding sites in MMACHC. Furthermore, siRNA-mediated knockdown of HCFC1 expression resulted in the coordinate downregulation of MMACHC mRNA. This X-linked disorder demonstrates a distinct disease mechanism by which transcriptional dysregulation leads to an inborn error of metabolism with a complex clinical phenotype.
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Affiliation(s)
- Hung-Chun Yu
- Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO 80045, USA
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Bickel RD, Dunham JP, Brisson JA. Widespread selection across coding and noncoding DNA in the pea aphid genome. G3 (Bethesda) 2013; 3:993-1001. [PMID: 23589520 PMCID: PMC3689810 DOI: 10.1534/g3.113.005793] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 04/08/2013] [Indexed: 12/03/2022]
Abstract
Genome-wide patterns of diversity and selection are critical measures for understanding how evolution has shaped the genome. Yet, these population genomic estimates are available for only a limited number of model organisms. Here we focus on the population genomics of the pea aphid (Acyrthosiphon pisum). The pea aphid is an emerging model system that exhibits a range of intriguing biological traits not present in classic model systems. We performed low-coverage genome resequencing of 21 clonal pea aphid lines collected from alfalfa host plants in North America to characterize genome-wide patterns of diversity and selection. We observed an excess of low-frequency polymorphisms throughout coding and noncoding DNA, which we suggest is the result of a founding event and subsequent population expansion in North America. Most gene regions showed lower levels of Tajima's D than synonymous sites, suggesting that the majority of the genome is not evolving neutrally but rather exhibits significant constraint. Furthermore, we used the pea aphid's unique manner of X-chromosome inheritance to assign genomic scaffolds to either autosomes or the X chromosome. Comparing autosomal vs. X-linked sequence variation, we discovered that autosomal genes show an excess of low frequency variants indicating that purifying selection acts more efficiently on the X chromosome. Overall, our results provide a critical first step in characterizing the genetic diversity and evolutionary pressures on an aphid genome.
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Affiliation(s)
- Ryan D Bickel
- University of Nebraska, School of Biological Sciences, Lincoln, Nebraska 68588, USA.
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Abstract
Charcot-Marie-Tooth neuropathy (CMT) is a group of genetically heterogeneous disorders sharing a similar phenotype, characterized by wasting and weakness mainly involving the distal muscles of lower and upper limbs, variably associated with distal sensory loss and skeletal deformities. This chapter deals with dominantly transmitted CMT and related disorders, namely hereditary neuropathy with liability to pressure palsies (HNPP) and hereditary neuralgic amyotrophy (HNA). During the last 20 years, several genes have been uncovered associated with CMT and our understanding of the underlying molecular mechanisms has greatly improved. Consequently, a precise genetic diagnosis is now possible in the majority of cases, thus allowing proper genetic counseling. Although, unfortunately, treatment is still unavailable for all types of CMT, several cellular and animal models have been developed and some compounds have proved effective in these models. The first trials with ascorbic acid in CMT type 1A have been completed and, although negative, are providing relevant information on disease course and on how to prepare for future trials.
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Affiliation(s)
- Davide Pareyson
- Clinics of Central and Peripheral Degenerative Neuropathies Unit, Department of Clinical Neurosciences, IRCCS Foundation, C. Besta Neurological Institute, Milan, Italy.
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Park CH, Jeong YH, Jeong YI, Lee SY, Jeong YW, Shin T, Kim NH, Jeung EB, Hyun SH, Lee CK, Lee E, Hwang WS. X-linked gene transcription patterns in female and male in vivo, in vitro and cloned porcine individual blastocysts. PLoS One 2012; 7:e51398. [PMID: 23236494 PMCID: PMC3517569 DOI: 10.1371/journal.pone.0051398] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 10/31/2012] [Indexed: 11/18/2022] Open
Abstract
To determine the presence of sexual dimorphic transcription and how in vitro culture environments influence X-linked gene transcription patterns in preimplantation embryos, we analyzed mRNA expression levels in in vivo-derived, in vitro-fertilized (IVF), and cloned porcine blastocysts. Our results clearly show that sex-biased expression occurred between female and male in vivo blastocysts in X-linked genes. The expression levels of XIST, G6PD, HPRT1, PGK1, and BEX1 were significantly higher in female than in male blastocysts, but ZXDA displayed higher levels in male than in female blastocysts. Although we found aberrant expression patterns for several genes in IVF and cloned blastocysts, similar sex-biased expression patterns (on average) were observed between the sexes. The transcript levels of BEX1 and XIST were upregulated and PGK1 was downregulated in both IVF and cloned blastocysts compared with in vivo counterparts. Moreover, a remarkable degree of expression heterogeneity was observed among individual cloned embryos (the level of heterogeneity was similar in both sexes) but only a small proportion of female IVF embryos exhibited variability, indicating that this phenomenon may be primarily caused by faulty reprogramming by the somatic cell nuclear transfer (SCNT) process rather than in vitro conditions. Aberrant expression patterns in cloned embryos of both sexes were not ameliorated by treatment with Scriptaid as a potent HDACi, although the blastocyst rate increased remarkably after this treatment. Taken together, these results indicate that female and male porcine blastocysts produced in vivo and in vitro transcriptional sexual dimorphisms in the selected X-linked genes and compensation of X-linked gene dosage may not occur at the blastocyst stage. Moreover, altered X-linked gene expression frequently occurred in porcine IVF and cloned embryos, indicating that X-linked gene regulation is susceptible to in vitro culture and the SCNT process, which may eventually lead to problems with embryonic or placental defects.
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Affiliation(s)
- Chi-Hun Park
- Sooam Biotech Research Foundation, Seoul, Republic of Korea
| | | | - Yeun-Ik Jeong
- Sooam Biotech Research Foundation, Seoul, Republic of Korea
| | - Se-Yeong Lee
- Sooam Biotech Research Foundation, Seoul, Republic of Korea
| | - Yeon-Woo Jeong
- Sooam Biotech Research Foundation, Seoul, Republic of Korea
| | - Taeyoung Shin
- Sooam Biotech Research Foundation, Seoul, Republic of Korea
| | - Nam-Hyung Kim
- Department of Animal Sciences, Chungbuk National University, Cheongju, Republic of Korea
| | - Eui-Bae Jeung
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Sang-Hwan Hyun
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Chang-Kyu Lee
- Department of Agricultural Biotechnology, Animal Biotechnology Major, and Research Institute for Agriculture and Life Science, Seoul National University, Seoul, Republic of Korea
| | - Eunsong Lee
- College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chunchon, Republic of Korea
| | - Woo Suk Hwang
- Sooam Biotech Research Foundation, Seoul, Republic of Korea
- * E-mail:
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Abstract
The X-linked form of Charcot-Marie-Tooth disease (CMT1X) is the second most common form of hereditary motor and sensory neuropathy. The clinical phenotype is characterized by progressive muscle atrophy and weakness, areflexia, and variable sensory abnormalities; central nervous system manifestations occur, too. Affected males have moderate to severe symptoms, whereas heterozygous females are usually less affected. Neurophysiology shows intermediate slowing of conduction and distal axonal loss. Nerve biopsies show more prominent axonal degeneration than de/remyelination. More than 400 different mutations in GJB1, the gene that encodes the gap junction (GJ) protein connexin32 (Cx32), cause CMT1X. Many Cx32 mutants fail to form functional GJs, or form GJs with abnormal biophysical properties. Schwann cells and oligodendrocytes express Cx32, and the GJs formed by Cx32 play an important role in the homeostasis of myelinated axons. Animal models of CMT1X demonstrate that loss of Cx32 in myelinating Schwann cells causes a demyelinating neuropathy. An effective therapy remains to be developed.
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Affiliation(s)
- Steven S Scherer
- Department of Neurology, The Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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Manjurano A, Clark TG, Nadjm B, Mtove G, Wangai H, Sepulveda N, Campino SG, Maxwell C, Olomi R, Rockett KR, Jeffreys A, Riley EM, Reyburn H, Drakeley C. Candidate human genetic polymorphisms and severe malaria in a Tanzanian population. PLoS One 2012; 7:e47463. [PMID: 23144702 PMCID: PMC3483265 DOI: 10.1371/journal.pone.0047463] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 09/12/2012] [Indexed: 11/18/2022] Open
Abstract
Human genetic background strongly influences susceptibility to malaria infection and progression to severe disease and death. Classical genetic studies identified haemoglobinopathies and erythrocyte-associated polymorphisms, as protective against severe disease. High throughput genotyping by mass spectrometry allows multiple single nucleotide polymorphisms (SNPs) to be examined simultaneously. We compared the prevalence of 65 human SNP's, previously associated with altered risk of malaria, between Tanzanian children with and without severe malaria. Five hundred children, aged 1–10 years, with severe malaria were recruited from those admitted to hospital in Muheza, Tanzania and compared with matched controls. Genotyping was performed by Sequenom MassArray, and conventional PCR was used to detect deletions in the alpha-thalassaemia gene. SNPs in two X-linked genes were associated with altered risk of severe malaria in females but not in males: heterozygosity for one or other of two SNPs in the G6PD gene was associated with protection from all forms of severe disease whilst two SNPs in the gene encoding CD40L were associated with respiratory distress. A SNP in the adenyl cyclase 9 (ADCY9) gene was associated with protection from acidosis whilst a polymorphism in the IL-1α gene (IL1A) was associated with an increased risk of acidosis. SNPs in the genes encoding IL-13 and reticulon-3 (RTN3) were associated with increased risk of cerebral malaria. This study confirms previously known genetic associations with protection from severe malaria (HbS, G6PD). It identifies two X-linked genes associated with altered risk of severe malaria in females, identifies mutations in ADCY9, IL1A and CD40L as being associated with altered risk of severe respiratory distress and acidosis, both of which are characterised by high serum lactate levels, and also identifies novel genetic associations with severe malaria (TRIM5) and cerebral malaria(IL-13 and RTN3). Further studies are required to test the generality of these associations and to understand their functional consequences.
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Affiliation(s)
- Alphaxard Manjurano
- Joint Malaria Programme, Kilimanjaro Christian Medical Centre, Moshi, Tanzania
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Taane G. Clark
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
- Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Behzad Nadjm
- Joint Malaria Programme, Kilimanjaro Christian Medical Centre, Moshi, Tanzania
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - George Mtove
- Joint Malaria Programme, Kilimanjaro Christian Medical Centre, Moshi, Tanzania
| | - Hannah Wangai
- Joint Malaria Programme, Kilimanjaro Christian Medical Centre, Moshi, Tanzania
| | - Nuno Sepulveda
- Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | | | - Caroline Maxwell
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Raimos Olomi
- Joint Malaria Programme, Kilimanjaro Christian Medical Centre, Moshi, Tanzania
| | - Kirk R. Rockett
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Anna Jeffreys
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | | | - Eleanor M. Riley
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Hugh Reyburn
- Joint Malaria Programme, Kilimanjaro Christian Medical Centre, Moshi, Tanzania
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Christopher Drakeley
- Joint Malaria Programme, Kilimanjaro Christian Medical Centre, Moshi, Tanzania
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
- * E-mail:
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