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Serag M, Plutino M, Charles P, Azulay JP, Chaussenot A, Paquis-Flucklinger V, Ait-El-Mkadem Saadi S, Rouzier C. A Case Report of SYNE1 Deficiency-Mimicking Mitochondrial Disease and the Value of Pangenomic Investigations. Genes (Basel) 2023; 14:2154. [PMID: 38136976 PMCID: PMC10743207 DOI: 10.3390/genes14122154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 11/24/2023] [Accepted: 11/27/2023] [Indexed: 12/24/2023] Open
Abstract
Mitochondrial disorders are characterized by a huge clinical, biochemical, and genetic heterogeneity, which poses significant diagnostic challenges. Several studies report that more than 50% of patients with suspected mitochondrial disease could have a non-mitochondrial disorder. Thus, only the identification of the causative pathogenic variant can confirm the diagnosis. Herein, we describe the diagnostic journey of a family suspected of having a mitochondrial disorder who were referred to our Genetics Department. The proband presented with the association of cerebellar ataxia, COX-negative fibers on muscle histology, and mtDNA deletions. Whole exome sequencing (WES), supplemented by a high-resolution array, comparative genomic hybridization (array-CGH), allowed us to identify two pathogenic variants in the non-mitochondrial SYNE1 gene. The proband and her affected sister were found to be compound heterozygous for a known nonsense variant (c.13258C>T, p.(Arg4420Ter)), and a large intragenic deletion that was predicted to result in a loss of function. To our knowledge, this is the first report of a large intragenic deletion of SYNE1 in patients with cerebellar ataxia (ARCA1). This report highlights the interest in a pangenomic approach to identify the genetic basis in heterogeneous neuromuscular patients with the possible cause of mitochondrial disease. Moreover, even rare copy number variations should be considered in patients with a phenotype suggestive of SYNE1 deficiency.
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Affiliation(s)
- Mounir Serag
- Service de Génétique Médicale, Hôpital l’Archet 2, CHU de Nice, 151 Route Saint-Antoine de Ginestière, 06202 Nice, France; (M.S.); (M.P.); (A.C.); (V.P.-F.); (S.A.-E.-M.S.)
- CNRS UMR7284/ INSERM U1081, Faculté de Médecine, Université Côte d’Azur, 06107 Nice, France
| | - Morgane Plutino
- Service de Génétique Médicale, Hôpital l’Archet 2, CHU de Nice, 151 Route Saint-Antoine de Ginestière, 06202 Nice, France; (M.S.); (M.P.); (A.C.); (V.P.-F.); (S.A.-E.-M.S.)
- CNRS UMR7284/ INSERM U1081, Faculté de Médecine, Université Côte d’Azur, 06107 Nice, France
| | - Perrine Charles
- Service de Génétique, La Pitié-Salpêtrière, AP-HP, 75610 Paris, France;
| | | | - Annabelle Chaussenot
- Service de Génétique Médicale, Hôpital l’Archet 2, CHU de Nice, 151 Route Saint-Antoine de Ginestière, 06202 Nice, France; (M.S.); (M.P.); (A.C.); (V.P.-F.); (S.A.-E.-M.S.)
- CNRS UMR7284/ INSERM U1081, Faculté de Médecine, Université Côte d’Azur, 06107 Nice, France
| | - Véronique Paquis-Flucklinger
- Service de Génétique Médicale, Hôpital l’Archet 2, CHU de Nice, 151 Route Saint-Antoine de Ginestière, 06202 Nice, France; (M.S.); (M.P.); (A.C.); (V.P.-F.); (S.A.-E.-M.S.)
- CNRS UMR7284/ INSERM U1081, Faculté de Médecine, Université Côte d’Azur, 06107 Nice, France
| | - Samira Ait-El-Mkadem Saadi
- Service de Génétique Médicale, Hôpital l’Archet 2, CHU de Nice, 151 Route Saint-Antoine de Ginestière, 06202 Nice, France; (M.S.); (M.P.); (A.C.); (V.P.-F.); (S.A.-E.-M.S.)
- CNRS UMR7284/ INSERM U1081, Faculté de Médecine, Université Côte d’Azur, 06107 Nice, France
| | - Cécile Rouzier
- Service de Génétique Médicale, Hôpital l’Archet 2, CHU de Nice, 151 Route Saint-Antoine de Ginestière, 06202 Nice, France; (M.S.); (M.P.); (A.C.); (V.P.-F.); (S.A.-E.-M.S.)
- CNRS UMR7284/ INSERM U1081, Faculté de Médecine, Université Côte d’Azur, 06107 Nice, France
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Xu L, Yang K, Zhu M, Yin S, Gu Y, Fan Q, Wang Y, Pang C, Ren S. Trio-based exome sequencing broaden the genetic spectrum in keratoconus. Exp Eye Res 2023; 226:109342. [PMID: 36502923 DOI: 10.1016/j.exer.2022.109342] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 11/09/2022] [Accepted: 12/05/2022] [Indexed: 12/13/2022]
Abstract
Keratoconus (KC) is a complex corneal disorder with genetic factors involving in its pathogenesis. The genetic etiology of KC has not been fully elucidated. In this study, we aimed to expand the genetic spectrum in KC by trio-based exome sequencing. Trio-based exome sequencing was conducted in 20 patients with KC and their unaffected parents to broaden the genetic spectrum of the disease. With a series of filtering criteria, de novo, recessive homozygous, and compound heterozygous variants in candidate genes were identified, and the candidate genes were classified for further analysis. Finally, we identified 60 variants in 32 candidate genes through trio-based exome sequencing. Among the candidate genes, 10 genes (ARHGEF10, ARHGEF17, ASPM, FLNA, NDRG1, NEB, PLS3, STARD8, SYNE1, TTN) were classified as cytoskeleton-related genes, 4 genes (COL28A1, SDK1, STAB1, TENM2) were classified as cell adhesion-related genes, and 18 genes (APLP2, BCORL1, CCNB3, FOXN1, FUT8, GALNT10, HEPH, HHIP, HMGB3, HS6ST2, JADE3, KIAA0040, MCF2L, MYOF, QRICH2, RPS6KA6, SMARCA1, TNRC6A) were classified into other genes group. Additionally, the candidate rare deleterious variants in TTN were highly repeated in 25% trios. In conclusion, the study provided new insights into the genetic spectrum of KC which might underlie the genetic etiology for the disease. The findings would improve our understanding of pathogenesis in KC and provide critical clues to future functional validation.
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Affiliation(s)
- Liyan Xu
- Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institute, People's Hospital of Zhengzhou University, Henan University People's Hospital, Zhengzhou, 450003, China
| | - Kaili Yang
- Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institute, People's Hospital of Zhengzhou University, Henan University People's Hospital, Zhengzhou, 450003, China
| | - Meng Zhu
- Zhengzhou University People's Hospital, Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institution, Zhengzhou, 450003, China
| | - Shanshan Yin
- Zhengzhou University People's Hospital, Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institution, Zhengzhou, 450003, China
| | - Yuwei Gu
- Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institute, People's Hospital of Zhengzhou University, Henan University People's Hospital, Zhengzhou, 450003, China
| | - Qi Fan
- Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institute, People's Hospital of Zhengzhou University, Henan University People's Hospital, Zhengzhou, 450003, China
| | - Yawen Wang
- Henan University People's Hospital, Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institute, Zhengzhou, 450003, China
| | - Chenjiu Pang
- Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institute, People's Hospital of Zhengzhou University, Henan University People's Hospital, Zhengzhou, 450003, China
| | - Shengwei Ren
- Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institute, People's Hospital of Zhengzhou University, Henan University People's Hospital, Zhengzhou, 450003, China; Zhengzhou University People's Hospital, Henan Provincial People's Hospital, Henan Eye Hospital, Henan Eye Institution, Zhengzhou, 450003, China.
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Xu L, Yang K, Yin S, Gu Y, Fan Q, Wang Y, Zhao D, Ren S. Family-based exome sequencing identifies candidate genes related to keratoconus in Chinese families. Front Genet 2022; 13:988620. [PMID: 36118869 PMCID: PMC9478549 DOI: 10.3389/fgene.2022.988620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 08/08/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Keratoconus (KC) is a complex corneal disorder with a strong genetic component. The present study aimed to identify candidate genes related to KC in Chinese families.Methods: Family-based exome sequencing was performed in ten patients suffering from KC who belong to five families with two affected members in each. The candidate rare variants were identified with multi-step bioinformatics analysis. The STRING website was used to perform the protein interaction of the identified genes.Results: Our analyses identified 32 candidate rare variants in 13 genes by family-based exome sequencing. The molecular analyses of identified genes showed that EPCAM directly interacted with CTNNB1 of the Hippo signaling pathway and focal adhesion pathway, and directly interacted with CTNNB1, CDH1 of the WNT signaling pathway. SHROOM3 directly interacted with ROCK2, ROCK1 of the focal adhesion pathway. SYNE1 directly interacted with MUSK of the extracellular matrix organization pathway. TEK directly interacted with VEGFA, SHC1, PIK3R1, GRB2 of the focal adhesion pathway. TTN directly interacted with CAPN3 of the extracellular matrix organization pathway.Conclusion: The EPCAM, SHROOM3, SYNE1, TEK, and TTN genes were potential high-risk candidate pathogenic genes of familial KC. The findings might significantly improve our understanding of the genetic etiology of the disease, providing novel insights on KC pathogenesis.
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Affiliation(s)
- Liyan Xu
- Henan Provincial People’s Hospital, Henan Eye Hospital, Henan Eye Institute, People’s Hospital of Zhengzhou University, Henan University People’s Hospital, Zhengzhou, China
| | - Kaili Yang
- Henan Provincial People’s Hospital, Henan Eye Hospital, Henan Eye Institute, People’s Hospital of Zhengzhou University, Henan University People’s Hospital, Zhengzhou, China
| | - Shanshan Yin
- Zhengzhou University People’s Hospital, Henan Provincial People’s Hospital, Henan Eye Hospital, Henan Eye Institution, Zhengzhou, China
| | - Yuwei Gu
- Henan Provincial People’s Hospital, Henan Eye Hospital, Henan Eye Institute, People’s Hospital of Zhengzhou University, Henan University People’s Hospital, Zhengzhou, China
| | - Qi Fan
- Henan Provincial People’s Hospital, Henan Eye Hospital, Henan Eye Institute, People’s Hospital of Zhengzhou University, Henan University People’s Hospital, Zhengzhou, China
| | - Yawen Wang
- Henan University People’s Hospital, Henan Provincial People’s Hospital, Henan Eye Hospital, Henan Eye Institute, Zhengzhou, China
| | - Dongqing Zhao
- Henan Provincial People’s Hospital, Henan Eye Hospital, Henan Eye Institute, People’s Hospital of Zhengzhou University, Henan University People’s Hospital, Zhengzhou, China
| | - Shengwei Ren
- Henan Provincial People’s Hospital, Henan Eye Hospital, Henan Eye Institute, People’s Hospital of Zhengzhou University, Henan University People’s Hospital, Zhengzhou, China
- *Correspondence: Shengwei Ren,
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Arias M, Mir P, Fernández-Matarrubia M, Arpa J, García-Ramos R, Blanco-Arias P, Quintans B, Sobrido MJ. Autosomal recessive spinocerebellar ataxia SCAR8/ARCA1: first families detected in Spain. NEUROLOGÍA (ENGLISH EDITION) 2022; 37:257-262. [PMID: 35595401 DOI: 10.1016/j.nrleng.2019.01.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Accepted: 01/16/2019] [Indexed: 11/18/2022] Open
Abstract
INTRODUCTION Autosomal recessive spinocerebellar ataxia type 8 (ARCA1/SCAR8) is caused by mutations of the SYNE1 gene. The disease was initially described in families from Quebec (Canada) with a phenotype of pure cerebellar syndrome, but in recent years has been reported with a more variable clinical phenotype in other countries. Cases have recently been described of muscular dystrophy, arthrogryposis, and cardiomyopathy due to SYNE1 mutations. OBJECTIVE To describe clinical and molecular findings from 4 patients (3 men and one woman) diagnosed with ARCA1/SCAR8 from 3 Spanish families from different regions. MATERIAL AND METHODS We describe the clinical, paraclinical, and genetic results from 4 patients diagnosed with ARCA1/SCAR8 at different Spanish neurology departments. RESULTS Onset occurred in the third or fourth decade of life in all patients. After 15 years of progression, 3 patients presented pure cerebellar syndrome, similar to the Canadian patients; the fourth patient, with over 30 years' progression, presented vertical gaze palsy, pyramidal signs, and moderate cognitive impairment. In all patients, MRI studies showed cerebellar atrophy. The genetic study revealed distinct pathogenic SYNE1 mutations in each family. CONCLUSIONS ARCA1/SCAR8 can be found worldwide and may be caused by many distinct mutations in the SYNE1 gene. The disease may manifest with a complex phenotype of varying severity.
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Affiliation(s)
- M Arias
- Servicio de Neurología, Complexo Hospitalario de Santiago de Compostela, Santiago de Compostela, La Coruña, Spain.
| | - P Mir
- Servicio de Neurología, Hospital Virgen del Rocío, Sevilla, Spain
| | | | - J Arpa
- Servicio de Neurología, Hospital Clínico San Carlos, Madrid, Spain
| | - R García-Ramos
- Servicio de Neurología, Hospital Clínico San Carlos, Madrid, Spain
| | - P Blanco-Arias
- Fundación Pública Galega de Medicina Xenómica, Santiago de Compostela, La Coruña, Spain
| | - B Quintans
- Grupo de Neurogenética, Instituto de Investigación Sanitaria de Santiago (IDIS)-Complexo Hospitalario Universitario, Santiago de Compostela, La Coruña, Spain; Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
| | - M J Sobrido
- Grupo de Neurogenética, Instituto de Investigación Sanitaria de Santiago (IDIS)-Complexo Hospitalario Universitario, Santiago de Compostela, La Coruña, Spain; Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
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5
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Arias M, Mir P, Fernández-Matarrubia M, Arpa J, García-Ramos R, Blanco-Arias P, Quintans B, Sobrido MJ. Autosomal recessive spinocerebellar ataxia SCAR8/ARCA1: First families detected in Spain. Neurologia 2022; 37:257-262. [PMID: 31103315 DOI: 10.1016/j.nrl.2019.01.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Accepted: 01/16/2019] [Indexed: 12/28/2022] Open
Abstract
INTRODUCTION Autosomal recessive spinocerebellar ataxia type 8 (ARCA1/SCAR8) is caused by mutations of the SYNE1 gene. The disease was initially described in families from Quebec (Canada) with a phenotype of pure cerebellar syndrome, but in recent years has been reported with a more variable clinical phenotype in other countries. Cases have recently been described of muscular dystrophy, arthrogryposis, and cardiomyopathy due to SYNE1 mutations. OBJECTIVE To describe clinical and molecular findings from 4 patients (3 men and one woman) diagnosed with ARCA1/SCAR8 from 3 Spanish families from different regions. MATERIAL AND METHODS We describe the clinical, paraclinical, and genetic results from 4 patients diagnosed with ARCA1/SCAR8 at different Spanish neurology departments. RESULTS Onset occurred in the third or fourth decade of live in all patients. After 15 years of progression, 3 patients presented pure cerebellar syndrome, similar to the Canadian patients; the fourth patient, with over 30 years' progression, presented vertical gaze palsy, pyramidal signs, and moderate cognitive impairment. In all patients, MRI studies showed cerebellar atrophy. The genetic study revealed distinct pathogenic SYNE1 mutations in each family. CONCLUSIONS ARCA1/SCAR8 can be found worldwide and may be caused by many distinct mutations in the SYNE1 gene. The disease may manifest with a complex phenotype of varying severity.
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Affiliation(s)
- M Arias
- Servicio de Neurología, Complexo Hospitalario de Santiago de Compostela, Santiago de Compostela, La Coruña, España.
| | - P Mir
- Servicio de Neurología, Hospital Virgen del Rocío, Sevilla, España
| | | | - J Arpa
- Servicio de Neurología, Hospital Clínico San Carlos de, Madrid, España
| | - R García-Ramos
- Servicio de Neurología, Hospital Clínico San Carlos de, Madrid, España
| | - P Blanco-Arias
- Fundación Pública Galega de Medicina Xenómica, Santiago de Compostela, La Coruña, España
| | - B Quintans
- Grupo de Neurogenética, Instituto de Investigación Sanitaria de Santiago (IDIS)-Complexo Hospitalario Universitario, Santiago de Compostela, La Coruña, España; Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos III, Madrid, España
| | - M J Sobrido
- Grupo de Neurogenética, Instituto de Investigación Sanitaria de Santiago (IDIS)-Complexo Hospitalario Universitario, Santiago de Compostela, La Coruña, España; Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos III, Madrid, España
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6
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Qian N, Wei T, Yang W, Wang J, Zhang S, Jin S, Dong W, Hao W, Yang Y, Huang R. Case Report: Late-Onset Autosomal Recessive Cerebellar Ataxia Associated With SYNE1 Mutation in a Chinese Family. Front Genet 2022; 13:795188. [PMID: 35281832 PMCID: PMC8905644 DOI: 10.3389/fgene.2022.795188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 01/24/2022] [Indexed: 11/13/2022] Open
Abstract
Autosomal recessive cerebellar ataxia type 1 (ARCA-1), also known as autosomal recessive spinocerebellar ataxia type 8 (SCAR8), is caused by spectrin repeat containing nuclear envelope protein 1 (SYNE1) gene mutation. Nesprin-1, encoded by SYNE1, is widely expressed in various tissues, especially in the striated muscle and cerebellum. The destruction of Nesprin-1 is related to neuronal and neuromuscular lesions. It has been reported that SYNE1 gene variation is associated with Emery-Dreifuss muscular dystrophy type 4, arthrogryposis multiplex congenita, SCAR8, and dilated cardiomyopathy. The clinical manifestations of SCAR8 are mainly characterized by relatively pure cerebellar ataxia and may be accompanied by upper and/or lower motor neuron dysfunction. Some affected people may also display cerebellar cognitive affective syndrome. It is conventionally held that the age at the onset of SCAR8 is between 6 and 42 years (the median age is 17 years). Here, we report a pedigree with SCAR8 where the onset age in the proband is 48 years. This case report extends the genetic profile and clinical features of SCAR8. A new pathogenic site (c.7578del; p.S2526Sfs*8) located in SYNE1, which is the genetic cause of the patient, was identified via whole exome sequencing (WES).
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Affiliation(s)
- Nannan Qian
- Graduate School, Anhui University of Traditional Chinese Medicine, Hefei, China
| | - Taohua Wei
- The First Affiliated Hospital of Anhui University of Traditional Chinese Medicine, Hefei, China
| | - Wenming Yang
- The First Affiliated Hospital of Anhui University of Traditional Chinese Medicine, Hefei, China
- Key Laboratory of Xin’an Medicine Ministry of Education, Hefei, China
| | - Jiuxiang Wang
- The First Affiliated Hospital of Anhui University of Traditional Chinese Medicine, Hefei, China
| | - Shijie Zhang
- The First Affiliated Hospital of Anhui University of Traditional Chinese Medicine, Hefei, China
| | - Shan Jin
- The First Affiliated Hospital of Anhui University of Traditional Chinese Medicine, Hefei, China
| | - Wei Dong
- Graduate School, Anhui University of Traditional Chinese Medicine, Hefei, China
- The First Affiliated Hospital of Anhui University of Traditional Chinese Medicine, Hefei, China
| | - Wenjie Hao
- Graduate School, Anhui University of Traditional Chinese Medicine, Hefei, China
| | - Yue Yang
- Graduate School, Anhui University of Traditional Chinese Medicine, Hefei, China
| | - Ru Huang
- V-Medical Laboratory Co., Ltd, Hangzhou, China
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Karlsson WK, Højgaard JLS, Vilhelmsen A, Crone C, Andersen B, Law I, Møller LB, Nielsen TT, Nielsen EN, Krag T, Svenstrup K, Nielsen JE. Novel Homozygous Truncating Variant Widens the Spectrum of Early-Onset Multisystemic SYNE1 Ataxia. THE CEREBELLUM 2021; 21:514-519. [PMID: 34318393 DOI: 10.1007/s12311-021-01308-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/16/2021] [Indexed: 11/28/2022]
Abstract
Pathogenic variants in the SYNE1 gene are associated with a phenotypic spectrum spanning from late-onset, slowly progressive, relatively pure ataxia to early-onset, fast progressive multisystemic disease. Since its first description in 2007 as an adult-onset ataxia in French Canadian families, subsequent identification of patients worldwide has widened the clinical spectrum and increased the number of identified pathogenic variants. We report a 20-year-old Faroese female with early-onset progressive gait problems, weakness, dysphagia, slurred speech, orthostatic dizziness, and urge incontinence. Neurological examination revealed mild cognitive deficits, dysarthria, broken slow pursuit, hypometric saccades, weakness with spasticity, hyperreflexia, absent ankle reflexes, ataxia, and wide-based, spastic gait. Magnetic resonance imaging displayed atrophy of the cerebellum, brainstem, and spinal cord. Severely prolonged central motor conduction time and lower motor neuron involvement was demonstrated electrophysiologically. Fluorodeoxyglucose-positron emission tomography (FDG-PET) scan showed hypometabolism of the cerebellum and right frontal lobe. Muscle biopsy revealed chronic neurogenic changes and near-absent immunostaining for Nesprin-1. Next-generation sequencing revealed a previously undescribed homozygous truncating, likely pathogenic variant in the SYNE1 gene. The patient's mother and paternal grandfather were heterozygous carriers of the variant. Her father's genotype was unobtainable. We expand the list of likely pathogenic variants in SYNE1 ataxia with a novel homozygous truncating variant with proximity to the C-terminus and relate it to a phenotype comprising early-onset cerebellar deficits, upper and lower motor neuron involvement and cognitive deficits. Also, we report novel findings of focally reduced frontal lobe FDG-PET uptake and motor evoked potential abnormalities suggestive of central demyelination.
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Affiliation(s)
- William Kristian Karlsson
- Department of Neurology, University of Copenhagen, Rigshospitalet, Inge Lehmanns Vej 8, 2100, Copenhagen, Denmark.
| | - Joan Lilja Sunnleyg Højgaard
- Department of Neurology, University of Copenhagen, Rigshospitalet, Inge Lehmanns Vej 8, 2100, Copenhagen, Denmark
| | - Anna Vilhelmsen
- Department of Psychiatry, National Hospital of the Faroe Islands, Tórshavn, Faroe Islands
| | - Clarissa Crone
- Department of Neurophysiology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Birgit Andersen
- Department of Neurophysiology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Ian Law
- Department of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Lisbeth Birk Møller
- Department of Clinical Genetics, Rigshospitalet Glostrup, University of Copenhagen, Copenhagen, Denmark
| | - Troels Tolstrup Nielsen
- Department of Neurology, University of Copenhagen, Rigshospitalet, Inge Lehmanns Vej 8, 2100, Copenhagen, Denmark.,Neurogenetics Clinic & Research Lab, Danish Dementia Research Centre, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark
| | - Emilie Neerup Nielsen
- Department of Neurology, University of Copenhagen, Rigshospitalet, Inge Lehmanns Vej 8, 2100, Copenhagen, Denmark
| | - Thomas Krag
- Department of Neurology, University of Copenhagen, Rigshospitalet, Inge Lehmanns Vej 8, 2100, Copenhagen, Denmark.,Department of Neurology, Copenhagen Neuromuscular Center, University of Copenhagen, Copenhagen, Denmark
| | - Kirsten Svenstrup
- Department of Neurology, University of Copenhagen, Rigshospitalet, Inge Lehmanns Vej 8, 2100, Copenhagen, Denmark.,Department of Neurology, Copenhagen Neuromuscular Center, University of Copenhagen, Copenhagen, Denmark
| | - Jørgen Erik Nielsen
- Department of Neurology, University of Copenhagen, Rigshospitalet, Inge Lehmanns Vej 8, 2100, Copenhagen, Denmark.,Neurogenetics Clinic & Research Lab, Danish Dementia Research Centre, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark
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Szpisjak L, Szaraz G, Salamon A, Nemeth VL, Szepfalusi N, Veres G, Kincses B, Maroti Z, Kalmar T, Rydzanicz M, Ploski R, Klivenyi P, Zadori D. Eye-tracking-aided characterization of saccades and antisaccades in SYNE1 ataxia patients: a pilot study. BMC Neurosci 2021; 22:7. [PMID: 33526008 PMCID: PMC7852103 DOI: 10.1186/s12868-021-00612-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 01/13/2021] [Indexed: 11/11/2022] Open
Abstract
Background SYNE1 ataxia is an autosomal recessive hereditary condition, the main characteristic features of which are gait and limb ataxia and cerebellar dysarthria. Reports have revealed that the clinical phenotype of SYNE1 ataxia is more complex than the first published cases with pure cerebellar signs indicated. The aim of this study was to characterize eye movement alterations in the first diagnosed Hungarian SYNE1 ataxia patients. Results Saccades and antisaccades were examined with an eye tracker device in 3 SYNE1 (one patient has two frameshift mutations [c.8515_8516insA, p.Met2839Asnfs*53 and c.11594_11595insG, p.Glu3866*] in a compound heterozygous state, whereas two subjects have a splicing variant [c.23146-2A > G] in a homozygous state), 6 Friedreich ataxia (FA) patients and 12 healthy controls. Besides that, detailed clinical phenotyping and comprehensive neuropsychological assessment were carried out in all patients with ataxia. In addition to the characteristic cerebellar alterations, pyramidal signs and polyneuropathy were observed at least in 2 SYNE1 ataxia patients, for which no other underlying reason was found. The eye tracking assessment revealed hypometric saccades in the longer amplitude (18.4°) saccadic paradigm in all SYNE1 patients, whereas 2 out of 3 SYNE1 subjects performed slow saccades as well. In the antisaccade task, higher incorrect ratios of antisaccades were demonstrated in SYNE1 patients compared to healthy controls, showing inverse correlation with working memory test results. The corresponding data of FA patients was dispersed over a wide range, partially overlapping with control data. Conclusions The current study draws attention to the presence of eye movement disorders in patients with SYNE1 ataxia and demonstrates that alterations in the antisaccade paradigm may be related to working memory deficits.
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Affiliation(s)
- Laszlo Szpisjak
- Department of Neurology, University of Szeged, Semmelweis u. 6, 6725, Szeged, Hungary
| | - Gabor Szaraz
- Department of Neurology, University of Szeged, Semmelweis u. 6, 6725, Szeged, Hungary
| | - Andras Salamon
- Department of Neurology, University of Szeged, Semmelweis u. 6, 6725, Szeged, Hungary
| | - Viola L Nemeth
- Department of Neurology, University of Szeged, Semmelweis u. 6, 6725, Szeged, Hungary
| | - Noemi Szepfalusi
- Department of Neurology, University of Szeged, Semmelweis u. 6, 6725, Szeged, Hungary
| | - Gabor Veres
- Department of Neurology, University of Szeged, Semmelweis u. 6, 6725, Szeged, Hungary.,MTA-SZTE Neuroscience Research Group, Szeged, Hungary
| | - Balint Kincses
- Department of Psychiatry, University of Szeged, Szeged, Hungary
| | - Zoltan Maroti
- Genetic Diagnostic Laboratory, Department of Pediatrics and Pediatric Health Center, University of Szeged, Szeged, Hungary
| | - Tibor Kalmar
- Genetic Diagnostic Laboratory, Department of Pediatrics and Pediatric Health Center, University of Szeged, Szeged, Hungary
| | | | - Rafal Ploski
- Department of Medical Genetics, Medical University of Warsaw, Warsaw, Poland
| | - Peter Klivenyi
- Department of Neurology, University of Szeged, Semmelweis u. 6, 6725, Szeged, Hungary
| | - Denes Zadori
- Department of Neurology, University of Szeged, Semmelweis u. 6, 6725, Szeged, Hungary.
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Peng Y, Ye W, Chen Z, Peng H, Wang P, Hou X, Wang C, Zhou X, Hou X, Li T, Qiu R, Hu Z, Tang B, Jiang H. Identifying SYNE1 Ataxia With Novel Mutations in a Chinese Population. Front Neurol 2018; 9:1111. [PMID: 30619065 PMCID: PMC6306413 DOI: 10.3389/fneur.2018.01111] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Accepted: 12/04/2018] [Indexed: 12/13/2022] Open
Abstract
Objective: Variants in SYNE1 have been widely reported in ataxia patients in Europe, with highly variable clinical phenotype. Until now, no mutation of SYNE1 ataxia has been reported among the Chinese population. Our aim was to screen for SYNE1 ataxia patients in China and extend the clinicogenetic spectrum. Methods: Variants in SYNE1 were detected by high-throughput sequencing on a cohort of 126 unrelated index patients with unexplained autosomal recessive or sporadic ataxia. Pathogenicity assessments of SYNE1 variants were interpreted according to the ACMG guidelines. Potential pathogenic variants were confirmed by Sanger sequencing. Clinical assessments were conducted by two experienced neurologists. Results: Two Chinese families with variable ataxia syndrome were identified (accounting for 1.6%; 2/126), separately caused by the novel homozygous SYNE1 mutation (NM_033071.3: c.21568C>T, p.Arg7190Ter), and compound heterozygous SYNE1 mutation (NM_033071.3: c.18684G>A, p.Trp6228Ter; c.17944C>T, p.Arg5982Ter), characterized by motor neuron impairment, mental retardation and arthrogryposis. Conclusions:SYNE1 ataxia exists in the Chinese population, as a rare form of autosomal recessive ataxia, with a complex phenotype. Our findings expanded the ethnic, phenotypic and genetic diversity of SYNE1 ataxia.
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Affiliation(s)
- Yun Peng
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Wei Ye
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Zhao Chen
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Huirong Peng
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Puzhi Wang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Xuan Hou
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Chunrong Wang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Xin Zhou
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Xiaocan Hou
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Tianjiao Li
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Rong Qiu
- School of Information Science and Engineering, Central South University, Changsha, China
| | - Zhengmao Hu
- Laboratory of Medical Genetics, Central South University, Changsha, China
| | - Beisha Tang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China.,Laboratory of Medical Genetics, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Diseases, Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China.,Parkinson's Disease Center of Beijing Institute for Brain Disorders, Beijing, China.,Collaborative Innovation Center for Brain Science, Shanghai, China.,Collaborative Innovation Center for Genetics and Development, Shanghai, China
| | - Hong Jiang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China.,Laboratory of Medical Genetics, Central South University, Changsha, China.,Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China.,Xinjiang Medical University, Ürümqi, China
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