1
|
Ekmekci H, Qutob O, Babayev H, Şahin A. Action Myoclonus-Renal Failure Syndrome: A Case Report with Bioinformatic Annotations. Cureus 2023; 15:e41261. [PMID: 37529812 PMCID: PMC10390031 DOI: 10.7759/cureus.41261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/01/2023] [Indexed: 08/03/2023] Open
Abstract
Action myoclonus-renal failure (AMRF) syndrome is a rare autosomal recessive disorder characterized by myoclonic epilepsy with occasional renal failure comorbidity. This study examines a consanguineous family with multiple members presenting myoclonic epilepsy. The disease's continued transmission within the family is attributable to a lack of genetic testing and the inability to establish a definitive diagnosis. Our objective is to guide physicians toward accurate diagnoses and reduce the disease's recurrence through appropriate genetic counseling. Various diagnostic approaches can contribute to identifying AMRF. While magnetic resonance imaging (MRI) results and blood panels may not yield definitive diagnoses, electromyography (EMG) studies can serve as a robust diagnostic tool, leading to genetic confirmation. In line with standardized protocols, EMG findings consistent with AMRF present a polyneuropathy characterized by axonal degeneration and demyelinating features. These features manifest as decreased amplitude for axonal degeneration and decreased nerve conduction velocity (NCV) for demyelination. The presence of such EMG findings in a patient exhibiting both renal and central nervous system involvement may reinforce a preliminary diagnosis and warrant further genetic analysis.
Collapse
Affiliation(s)
- Hakan Ekmekci
- Department of Neurology, Selcuk University Faculty of Medicine, Konya, TUR
| | - Omar Qutob
- Department of Neurology, Selcuk University Faculty of Medicine, Konya, TUR
| | - Huseyn Babayev
- Department of Neurodevelopers, Silicosome Biotechnology, Konya, TUR
- Department of Microbiology, Abant Izzet Baysal University, Bolu, TUR
| | - Ali Şahin
- Department of Neurology, Selcuk University Faculty of Medicine, Konya, TUR
- Department of Neurodevelopers, Silicosome Biotechnology, Konya, TUR
| |
Collapse
|
2
|
Tanriverdi U, Ser MH, Yesil G, Gunduz A, Ozkara C, Kiziltan ME. Action myoclonus-renal failure syndrome: Electrophysiological analysis and clinical progression of two siblings. Parkinsonism Relat Disord 2022; 99:73-75. [PMID: 35617746 DOI: 10.1016/j.parkreldis.2022.04.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 04/26/2022] [Accepted: 04/30/2022] [Indexed: 10/18/2022]
Affiliation(s)
- Uygur Tanriverdi
- Department of Neurology, Cerrahpasa Faculty of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey.
| | - Merve Hazal Ser
- Department of Neurology, Cerrahpasa Faculty of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Gozde Yesil
- Department of Medical Genetics, Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Aysegul Gunduz
- Department of Neurology, Cerrahpasa Faculty of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Cigdem Ozkara
- Department of Neurology, Cerrahpasa Faculty of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Meral E Kiziltan
- Department of Neurology, Cerrahpasa Faculty of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey
| |
Collapse
|
3
|
Atasu B, Acarlı ANO, Bilgic B, Baykan B, Demir E, Ozluk Y, Turkmen A, Hauser AK, Guven G, Hanagasi H, Gurvit H, Emre M, Gasser T, Lohmann E. Genotype-Phenotype correlations of SCARB2 associated clinical presentation: a case report and in-depth literature review. BMC Neurol 2022; 22:122. [PMID: 35346091 PMCID: PMC8962058 DOI: 10.1186/s12883-022-02628-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 03/09/2022] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Biallelic pathogenic variants in the SCARB2 gene have been associated with action myoclonus-renal failure (AMRF) syndrome. Even though SCARB2 associated phenotype has been reported to include typical neurological characteristics, depending on the localization and the feature of the pathogenic variants, clinical course and the presentations have been shown to differ. CASE PRESENTATION Whole exome sequencing (WES) analysis revealed a homozygous truncating variant (p.N45MfsX88) in SCARB2 gene in the index case, and subsequent sanger sequencing analysis validated the variant in all affected family members from a Turkish family with the clinical characteristics associated with AMRF and related disorders. Intrafamilial clinical heterogeneity with common features including dysarthria, tremor and proteinuria, and distinct features such as peripheral neuropathy (PNP), myoclonus and seizures between the affected cases, was observed in the family. In-depth literature review enabled the detailed investigation of the reported variants associated with AMRF and suggested that while the type of the variant did not have a major impact on the course of the clinical characteristics, only the C terminal localization of the pathogenic variant significantly affected the clinical presentation, particularly the age at onset (AO) of the disease. CONCLUSIONS In this study we showed that biallelic SCARB2 pathogenic variants might cause a spectrum of common and distinct features associated with AMRF. Of those features while the common features include myoclonus (100%), ataxia (96%), tonic clonic seizures (82%), dysarthria (68%), tremor (65%), and renal impairment (62%), the uncommon features involve PNP (17%), hearing loss (6.8%), and cognitive impairment (13.7%). AO has been found to be significantly higher in the carriers of the p.G462DfsX34 pathogenic variant. SCARB2 pathogenic variants have not been only implicated in AMRF but also in the pathogenesis of Parkinson's disease (PD) and Gaucher disease (GD), suggesting the importance of genetic and functional studies in the clinical and the diagnostic settings. Given the proven role of SCARB2 gene in the pathogenesis of AMRF, PD and GD with a wide spectrum of clinical symptoms, investigation of the possible modifiers, such as progranulin and HSP7, has a great importance.
Collapse
Affiliation(s)
- Burcu Atasu
- Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.
- German Center for Neurodegenerative Diseases (DZNE)-Tübingen, Tübingen, Germany.
| | - Ayse Nur Ozdag Acarlı
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Basar Bilgic
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Betül Baykan
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Erol Demir
- Division of Nephrology, Department of Internal Medicine, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Yasemin Ozluk
- Department of Pathology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Aydin Turkmen
- Division of Nephrology, Department of Internal Medicine, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
- Division of Nephrology, Department of Internal Medicine, Koc School of Medicine, Koc University, Istanbul, Turkey
| | - Ann-Kathrin Hauser
- Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
- German Center for Neurodegenerative Diseases (DZNE)-Tübingen, Tübingen, Germany
| | - Gamze Guven
- Institute for Experimental Medicine, Genetics Department, Istanbul University, Istanbul, Turkey
| | - Hasmet Hanagasi
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Hakan Gurvit
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Murat Emre
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Thomas Gasser
- Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
- German Center for Neurodegenerative Diseases (DZNE)-Tübingen, Tübingen, Germany
| | - Ebba Lohmann
- Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
- German Center for Neurodegenerative Diseases (DZNE)-Tübingen, Tübingen, Germany
| |
Collapse
|
4
|
Yari A, Ali-Nejad RM, Saleh-Gohari N. A novel homozygous splice-site mutation in SCARB2 is associated with progressive myoclonic epilepsy with renal failure. Neurol Sci 2021; 42:5077-5085. [PMID: 33772352 DOI: 10.1007/s10072-021-05196-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 03/16/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND Progressive myoclonic epilepsy-4 with or without renal failure (EPM4) is a rare neurological autosomal recessive disorder caused by mutations in SCARB2 gene. In this study, we described clinical features and genetic causes of an Iranian family with two affected individuals whose clinical manifestations closely resembled progressive myoclonus epilepsy. METHODS Our proband was a 38-year-old male with a history of tremor, generalized seizures, action myoclonus, ataxia, and dysarthria that presumptive diagnosed as progressive myoclonus epilepsy. His older sister has the same symptoms. Whole-exome sequencing of DNA sample from the proband was performed. Candidate variant and cosegregation were confirmed by direct sequencing. Functional prediction of candidate variant was performed using appropriate prediction tools. RESULTS Genetic analysis identified a homozygous splicing c.423+1 G>A variant in the SCARB2 gene of the proband and his affected sister. Segregation study identified heterozygous state in four unaffected family members (parents and two children). The variant is localized at the first nucleotide of intron 3 and was not detected among in-house healthy controls. This variant was not reported in genetic databases and predicted to potentially alter the 5' donor splice site and disease causing using online prediction tools. It was classified as a likely pathogenic variant according to ACMG standards and guidelines. CONCLUSION This is the first report that demonstrates c.423+1 G>A variant in the SCARB2 gene segregating with the phenotype of EPM4 in a consanguineous Iranian family.
Collapse
Affiliation(s)
- Abolfazl Yari
- Department of Medical Genetics, Afzalipour Faculty of Medicine, Kerman University of Medical Sciences, Kerman, 7616914115, Iran
- Student Research Committee, Afzalipour Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Reza Molla Ali-Nejad
- Department of Medical Genetics, Faculty of Medicine, Jiroft University of Medical Sciences, Jiroft, Iran
| | - Nasrollah Saleh-Gohari
- Department of Medical Genetics, Afzalipour Faculty of Medicine, Kerman University of Medical Sciences, Kerman, 7616914115, Iran.
| |
Collapse
|
5
|
A diagnosis of progressive myoclonic ataxia guided by blood biomarkers. Parkinsonism Relat Disord 2021; 94:124-126. [PMID: 34275752 DOI: 10.1016/j.parkreldis.2021.06.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 06/28/2021] [Accepted: 06/29/2021] [Indexed: 11/21/2022]
|
6
|
Uçan Tokuç FE, Genç F, Erdal A, Biçer Gömceli Y. Report of two siblings with action myoclonus renal failure syndrome. Seizure 2021; 88:73-74. [PMID: 33836450 DOI: 10.1016/j.seizure.2021.03.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 03/14/2021] [Accepted: 03/19/2021] [Indexed: 10/21/2022] Open
Affiliation(s)
- F E Uçan Tokuç
- Department of Neurology, Antalya Training and Research Hospital, Antalya, Turkey.
| | - F Genç
- Department of Neurology, Antalya Training and Research Hospital, Antalya, Turkey
| | - A Erdal
- Department of Neurology, Ankara City Hospital, University of Health Sciences, Ankara, Turkey
| | - Y Biçer Gömceli
- Department of Neurology, Antalya Training and Research Hospital, Antalya, Turkey
| |
Collapse
|
7
|
Bhowmick SS, Lang AE. Movement Disorders and Renal Diseases. Mov Disord Clin Pract 2020; 7:763-779. [PMID: 33043074 DOI: 10.1002/mdc3.13005] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 06/03/2020] [Accepted: 06/05/2020] [Indexed: 02/06/2023] Open
Abstract
Movement disorders often emerge from the interplay of complex pathophysiological processes involving the kidneys and the nervous system. Tremor, myoclonus, ataxia, chorea, and parkinsonism can occur in the context of renal dysfunction (azotemia and electrolyte abnormalities) or they can be part of complications of its management (dialysis and renal transplantation). On the other hand, myoglobinuria from rhabdomyolysis in status dystonicus and certain drugs used in the management of movement disorders can cause nephrotoxicity. Distinct from these well-recognized associations, it is important to appreciate that there are several inherited and acquired disorders in which movement abnormalities do not occur as a consequence of renal dysfunction or vice versa but are manifestations of common pathophysiological processes affecting the nervous system and the kidneys. These disorders are the emphasis of this review. Increasing awareness of these conditions among neurologists may help them to identify renal involvement earlier, take timely intervention by anticipating complications and focus on therapies targeting common mechanisms in addition to symptomatic management of movement disorders. Recognition of renal impairment in a patient with complex neurological presentation may narrow down the differentials and aid in reaching a definite diagnosis.
Collapse
Affiliation(s)
- Suvorit S Bhowmick
- Division of Neurology, Department of Medicine, Morton and Gloria Shulman Movement Disorders Clinic and the Edmond J. Safra Program in Parkinson's Disease, Toronto Western Hospital University Health Network Toronto Ontario Canada
| | - Anthony E Lang
- Division of Neurology, Department of Medicine, Morton and Gloria Shulman Movement Disorders Clinic and the Edmond J. Safra Program in Parkinson's Disease, Toronto Western Hospital University Health Network Toronto Ontario Canada
| |
Collapse
|
8
|
The best evidence for progressive myoclonic epilepsy: A pathway to precision therapy. Seizure 2019; 71:247-257. [PMID: 31476531 DOI: 10.1016/j.seizure.2019.08.012] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/21/2019] [Accepted: 08/23/2019] [Indexed: 12/13/2022] Open
Abstract
Progressive Myoclonus Epilepsies (PMEs) are a group of uncommon clinically and genetically heterogeneous disorders characterised by myoclonus, generalized epilepsy, and neurological deterioration, including dementia and ataxia. PMEs may have infancy, childhood, juvenile or adult onset, but usually present in late childhood or adolescence, at variance from epileptic encephalopathies, which start with polymorphic seizures in early infancy. Neurophysiologic recordings are suited to describe faithfully the time course of the shock-like muscle contractions which characterize myoclonus. A combination of positive and negative myoclonus is typical of PMEs. The gene defects for most PMEs (Unverricht-Lundborg disease, Lafora disease, several forms of neuronal ceroid lipofuscinoses, myoclonus epilepsy with ragged-red fibers [MERRF], and type 1 and 2 sialidoses) have been identified. PMEs are uncommon disorders, difficult to diagnose in the absence of extensive experience. Thus, aetiology is undetermined in many patients, despite the advance in molecular medicine. Treatment of PMEs remains essentially symptomaticof seizures and myoclonus, together with palliative, supportive, and rehabilitative measures. The response to therapy may initially be relatively favourable, afterwards however, seizures may become more frequent, and progressive neurologic decline occurs. The prognosis of a PME depends on the specific disease. The history of PMEs revealed that the international collaboration and sharing experience is the right way to proceed. This emerging picture and biological insights will allow us to find ways to provide the patients with meaningful treatment.
Collapse
|
9
|
He J, Lin H, Li JJ, Su HZ, Wang DN, Lin Y, Wang N, Chen WJ. Identification of a Novel Homozygous Splice-Site Mutation in SCARB2 that Causes Progressive Myoclonus Epilepsy with or without Renal Failure. Chin Med J (Engl) 2018; 131:1575-1583. [PMID: 29941711 PMCID: PMC6032684 DOI: 10.4103/0366-6999.235113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Progressive myoclonus epilepsies (PMEs) comprise a group of rare genetic disorders characterized by action myoclonus, epileptic seizures, and ataxia with progressive neurologic decline. Due to clinical and genetic heterogeneity of PMEs, it is difficult to decide which genes are affected. The aim of this study was to report an action myoclonus with or without renal failure syndrome (EPM4) family and summarize the clinical and genetic characteristics of all reported EPM4 patients. METHODS In the present study, targeted next-generation sequencing (NGS) was applied to screen causative genes in a Chinese PME family. The candidate variant was further confirmed by cosegregation analysis and further functional analysis, including the reverse transcription polymerase chain reaction and Western blot of the proband's muscle. Moreover, literature data on the clinical and mutational features of all reported EPM4 patients were reviewed. RESULTS The gene analysis revealed a novel homozygous splicing mutation (c.995-1G>A) of the SCARB2 gene in two brothers. Further functional analysis revealed that this mutation led to loss function of the SCARB2 protein. The classification of the candidate variant, according to the American College of Medical Genetics and Genomics standards and guidelines and functional analysis, was pathogenic. Therefore, these two brothers were finally diagnostically confirmed as EPM4. CONCLUSIONS These present results suggest the potential for targeted NGS to conduct a more rapid and precise diagnosis for PME patients. A literature review revealed that mutations in the different functional domains of SCARB2 appear to be associated with the phenotype of EPM4.
Collapse
Affiliation(s)
- Jin He
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, Fujian 350005, China
| | - Han Lin
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, Fujian 350005, China
| | - Jin-Jing Li
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, Fujian 350005, China
| | - Hui-Zhen Su
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, Fujian 350005, China
| | - Dan-Ni Wang
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, Fujian 350005, China
| | - Yu Lin
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, Fujian 350005, China
- Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, Fujian 350005, China
| | - Ning Wang
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, Fujian 350005, China
- Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, Fujian 350005, China
| | - Wan-Jin Chen
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, Fujian 350005, China
- Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, Fujian 350005, China
| |
Collapse
|
10
|
Tian WT, Liu XL, Xu YQ, Huang XJ, Zhou HY, Wang Y, Tang HD, Chen SD, Luan XH, Cao L. Progressive myoclonus epilepsy without renal failure in a Chinese family with a novel mutation in SCARB2 gene and literature review. Seizure 2018; 57:80-86. [PMID: 29605618 DOI: 10.1016/j.seizure.2018.03.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 02/16/2018] [Accepted: 03/13/2018] [Indexed: 10/17/2022] Open
Abstract
PURPOSE To describe the clinical and genetic features of a Chinese progressive myoclonus epilepsy (PME) patient related with SCARB2 mutation without renal impairment and review 27 SCARB2-related PME patients from 11 countries. METHODS The patient was a 27-year-old man with progressive action myoclonus, ataxia, epilepsy, dysarthria and absence of cognitive deterioration. Renal functional test was normal. Electroencephalography (EEG) showed progressively slowed background activity and sporadic generalized spike-and-wave discharges. Electromyography (EMG) showed slowed motor and sensory nerve conduction velocities and distal motor latency delay accompanied by normal compound motor action potential (CMAP) and amplitudes of sensory nerve action potential (SNAP). The amplitude of cortical components of brainstem auditory-evoked potential (BAEP) was normal with slightly prolonged latencies. Generalized atrophy, ventricle enlargement and white matter degeneration was observed in brain magnetic resonance imaging (MRI). Open muscle biopsy and genetic analysis were performed. Two hundred healthy individuals were set for control. Quantitative real time PCR (qPCR), western blotting and immunofluorescence were carried out to evaluate the fate of the SCARB2 mRNA and lysosomal-membrane type 2 (LIMP2) protein level. RESULTS One homozygous mutation in SCARB2 gene (c.1187 + 5G > T) was identified in the patient. Each of his parents carried a heterozygous variant. This mutation was not detected among the healthy controls and predicted to be damaging or disease causing by prediction tools. qPCR revealed a significantly lower level of SCARB2 mRNA in peripheral blood cell of the proband compared with his parents and healthy control individuals. Muscle biopsy showed mild variation in fiber size. Western blotting and immunofluorescence detected an extremely weak signal of LIMP2 protein from skeletal muscle of the proband. CONCLUSION In this study, we identified a SCARB2-related PME patient with normal renal function and a novel homozygous splicing mutation. SCARB2 gene should be analyzed in patients with progressive action myoclonus, epilepsy, peripheral neuropathy, without cognitive deterioration or renal failure.
Collapse
Affiliation(s)
- Wo-Tu Tian
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Xiao-Li Liu
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China; Department of Neurology, Shanghai Fengxian District Central Hospital, Shanghai Jiao Tong University Affiliated Sixth People's Hospital South Campus, Shanghai, 201406, China.
| | - Yang-Qi Xu
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Xiao-Jun Huang
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Hai-Yan Zhou
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Ying Wang
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Hui-Dong Tang
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Sheng-Di Chen
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Xing-Hua Luan
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Li Cao
- Department of Neurology and Institute of Neurology, Rui Jin Hospital & Rui Jin Hospital North, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| |
Collapse
|
11
|
Chow YP, Abdul Murad NA, Mohd Rani Z, Khoo JS, Chong PS, Wu LL, Jamal R. Exome sequencing identifies SLC26A4, GJB2, SCARB2 and DUOX2 mutations in 2 siblings with Pendred syndrome in a Malaysian family. Orphanet J Rare Dis 2017; 12:40. [PMID: 28222800 PMCID: PMC5320863 DOI: 10.1186/s13023-017-0575-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 01/20/2017] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Pendred syndrome (PDS, MIM #274600) is an autosomal recessive disorder characterized by congenital sensorineural hearing loss and goiter. In this study, we describing the possible PDS causal mutations in a Malaysian family with 2 daughters diagnosed with bilateral hearing loss and hypothyroidism. METHODS AND RESULTS Whole exome sequencing was performed on 2 sisters with PDS and their unaffected parents. Our results showed that both sisters inherited monoallelic mutations in the 2 known PDS genes, SLC26A4 (ENST00000265715:c.1343C > T, p.Ser448Leu) and GJB2 (ENST00000382844:c.368C > A, p.Thr123Asn) from their father, as well as another deafness-related gene, SCARB2 (ENST00000264896:c.914C > T, p.Thr305Met) from their mother. We postulated that these three heterozygous mutations in combination may be causative to deafness, and warrants further investigation. Furthermore, we also identified a compound heterozygosity involving the DUOX2 gene (ENST00000603300:c.1588A > T:p.Lys530* and c.3329G > A:p.Arg1110Gln) in both sisters which are inherited from both parents and may be correlated with early onset of goiter. All the candidate mutations were predicted deleterious by in silico tools. CONCLUSIONS In summary, we proposed that PDS in this family could be a polygenic disorder which possibly arises from a combination of heterozygous mutations in SLC26A4, GJB2 and SCARB2 which associated with deafness, as well as compound heterozygous DUOX2 mutations which associated with thyroid dysfunction.
Collapse
Affiliation(s)
- Yock-Ping Chow
- UKM Medical Molecular Biology Institute (UMBI), Chancellor Tuanku Muhriz Hospital, UKM Medical Centre, Jalan Yaacob Latif, 56000 Cheras, Kuala Lumpur, Malaysia
| | - Nor Azian Abdul Murad
- UKM Medical Molecular Biology Institute (UMBI), Chancellor Tuanku Muhriz Hospital, UKM Medical Centre, Jalan Yaacob Latif, 56000 Cheras, Kuala Lumpur, Malaysia
| | - Zamzureena Mohd Rani
- UKM Medical Molecular Biology Institute (UMBI), Chancellor Tuanku Muhriz Hospital, UKM Medical Centre, Jalan Yaacob Latif, 56000 Cheras, Kuala Lumpur, Malaysia
| | - Jia-Shiun Khoo
- Codon Genomics S/B, No 26, Jalan Dutamas 7, Taman Dutamas, Balakong, 43200 Seri Kembangan, Selangor Malaysia
| | - Pei-Sin Chong
- Codon Genomics S/B, No 26, Jalan Dutamas 7, Taman Dutamas, Balakong, 43200 Seri Kembangan, Selangor Malaysia
| | - Loo-Ling Wu
- Department of Pediatrics, Chancellor Tuanku Muhriz Hospital, UKM Medical Centre, Jalan Yaacob Latif, 56000 Cheras, Kuala Lumpur, Malaysia
| | - Rahman Jamal
- UKM Medical Molecular Biology Institute (UMBI), Chancellor Tuanku Muhriz Hospital, UKM Medical Centre, Jalan Yaacob Latif, 56000 Cheras, Kuala Lumpur, Malaysia
- Department of Pediatrics, Chancellor Tuanku Muhriz Hospital, UKM Medical Centre, Jalan Yaacob Latif, 56000 Cheras, Kuala Lumpur, Malaysia
| |
Collapse
|
12
|
Dibbens L, Schwake M, Saftig P, Rubboli G. SCARB2/LIMP2 deficiency in action myoclonus-renal failure syndrome. Epileptic Disord 2016; 18:63-72. [PMID: 27582254 DOI: 10.1684/epd.2016.0843] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Action myoclonus-renal failure syndrome (AMRF) is an autosomal recessive progressive myoclonus epilepsy (PME) associated with renal dysfunction that appears in the second or third decade of life and that is caused by loss-of-function mutations in the SCARB2 gene encoding lysosomal integral membrane protein type 2 (LIMP2). Recent reports have documented cases with PME associated with SCARB2 mutations without renal compromise. Additional neurological features can be demyelinating peripheral neuropathy, hearing loss and dementia. The course of the disease in relentlessly progressive. In this paper we provide an updated overview of the clinical and genetic features of SCARB2-related PME and on the functions of the LIMP2 protein.
Collapse
Affiliation(s)
- Leanne Dibbens
- Epilepsy Research Group, School of Pharmacy and Medical Sciences, University of South Australia, and Sansom Institute for Health Research, South Australia, Australia
| | | | - Paul Saftig
- Biochemical Institute, Christian-Albrechts-University Kiel, Germany
| | - Guido Rubboli
- Danish Epilepsy Center, Filadelfia/University of Copenhagen, Dianalund, Denmark, IRCCS, Institute of Neurologicak Sciences, Bellaria Hospital, Bologna, Italy
| |
Collapse
|
13
|
Fu YJ, Aida I, Tada M, Tada M, Toyoshima Y, Takeda S, Nakajima T, Naito H, Nishizawa M, Onodera O, Kakita A, Takahashi H. Progressive myoclonus epilepsy: extraneuronal brown pigment deposition and system neurodegeneration in the brains of Japanese patients with novel SCARB2 mutations. Neuropathol Appl Neurobiol 2014; 40:551-63. [PMID: 23659519 DOI: 10.1111/nan.12057] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2012] [Accepted: 04/30/2013] [Indexed: 11/29/2022]
Abstract
AIMS Mutations in the SCARB2 gene cause a rare autosomal recessive disease, progressive myoclonus epilepsy (PME) with or without renal failure, the former also being designated action myoclonus-renal failure syndrome. Although reported cases have been accumulating, only a few have described its neuropathology. We studied two Japanese patients with PME without renal failure, in whom the ages at onset and disease durations were 45 and 20 years, and 14 and 8.5 years respectively. METHODS Sequencing and restriction analysis of the SCARB2 gene and neuropathological examination with immunohistochemistry were performed. RESULTS Gene analyses revealed novel homozygous frameshift and nonsense mutations in the SCARB2 gene. Both cases exhibited deposition of brown pigment in the brain, especially the cerebellar and cerebral cortices. Ultrastructurally, the pigment granules were localized in astrocytes. Neuronal loss and gliosis were also evident in the brain, including the pallidoluysian and cerebello-olivary systems. The spinal cord was also affected. Such changes were less severe in one patient with late-onset disease than in the other patient with early-onset disease. In brain and kidney sections, immunostaining with an antibody against the C-terminus of human SCARB2 revealed decreased levels and no expression of the protein respectively. CONCLUSIONS The frameshift mutation detected in the patient with late-onset disease is a hitherto undescribed, unique type of SCARB2 gene mutation. The present two patients are the first reported to have clearly demonstrated both extraneuronal brown pigment deposition and system neurodegeneration as neuropathological features of PME with SCARB2 mutations.
Collapse
Affiliation(s)
- Yong-Juan Fu
- Department of Pathology, Brain Research Institute, University of Niigata, Niigata, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Zeigler M, Meiner V, Newman JP, Steiner-Birmanns B, Bargal R, Sury V, Mengistu G, Kakhlon O, Leykin I, Argov Z, Abramsky O, Lossos A. A novel SCARB2 mutation in progressive myoclonus epilepsy indicated by reduced β-glucocerebrosidase activity. J Neurol Sci 2014; 339:210-3. [PMID: 24485911 DOI: 10.1016/j.jns.2014.01.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 12/23/2013] [Accepted: 01/14/2014] [Indexed: 11/24/2022]
Abstract
Action myoclonus renal failure (AMRF) syndrome is a rare form of progressive myoclonus epilepsy with renal dysfunction related to mutations in the SCARB2 gene. This gene is involved in lysosomal mannose-6-phosphate-independent trafficking of β-glucocerebrosidase (GC), an enzyme deficient in Gaucher disease. We report a family with myoclonic epilepsy, ataxia and skeletal muscle atrophy but without cognitive impairment or overt renal disease. A novel SCARB2 mutation was indicated by a striking discrepancy between lymphocyte and fibroblast GC activity in the proband evaluated for possible Gaucher disease. Our findings expand the genetic and phenotypic diversity of AMRF and suggest that low GC activity may present an important biochemical clue to the diagnosis of AMRF.
Collapse
Affiliation(s)
- Marsha Zeigler
- Department of Human Genetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - Vardiella Meiner
- Department of Human Genetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - J P Newman
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | | | - Ruth Bargal
- Department of Human Genetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - Vivi Sury
- Department of Human Genetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - Getu Mengistu
- Department of Human Genetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - Or Kakhlon
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - Ina Leykin
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - Zohar Argov
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - Oded Abramsky
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - Alexander Lossos
- Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hebrew University-Hadassah Medical Center, Jerusalem, Israel.
| |
Collapse
|
15
|
Perandones C, Pellene LA, Micheli F. A new SCARB2 mutation in a patient with progressive myoclonus ataxia without renal failure. Mov Disord 2014; 29:158-9. [PMID: 24339182 DOI: 10.1002/mds.25738] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Accepted: 09/30/2013] [Indexed: 12/16/2023] Open
Affiliation(s)
- Claudia Perandones
- Parkinson's Disease and Movement Disorders Program, Hospital de Clínicas José de San Martín, University of Buenos Aires, Argentina
| | | | | |
Collapse
|