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Nagappa M, Sharma S, Govindaraj P, Chickabasaviah YT, Siram R, Shroti A, Seshagiri DV, Debnath M, Sinha S, Bindu PS, Taly AB. Characterisation of Patients with SH3TC2 Associated Neuropathy in an Indian Cohort. Neurol India 2023; 71:940-945. [PMID: 37929431 DOI: 10.4103/0028-3886.388101] [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] [Indexed: 11/07/2023]
Abstract
Background SH3TC2 variations lead to demyelinating recessive Charcot-Marie-Tooth (CMT) disease, which is commonly associated with early-onset scoliosis and cranial neuropathy. Data from Indian ethnicity is limited. Objective We aim to report the characteristics of patients with SH3TC2-associated neuropathy from an Indian cohort. Patients and Methods Data of five unrelated subjects with SH3TC2 variations were analyzed. Results Clinical features included female predominance (n = 4), early-onset neuropathy (n = 2), pes cavus and hammer toes (n = 4), kyphoscoliosis (n = 1), impaired vision and hearing (n = 1), facial muscle weakness (n = 1), impaired kinaesthetic sense (n = 3), tremor (n = 2), and ataxia (n = 1). Four patients had the "CMT" phenotype, while one patient had Roussy-Levy syndrome. All had demyelinating electrophysiology with conduction velocities being "very slow" in one, "slow" in one, "mildly slow" in two, and "intermediate" in one patient. Brain stem auditory evoked potentials were universally abnormal though only one patient had symptomatic deafness. Seven variants were identified in SH3TC2 [homozygous = 3 (c.1412del, c.69del, c.3152G>A), heterozygous = 4 (c.1105C>T, c.3511C>T, c.2028G>C, c.254A>T)]. Except for c.3511C>T variant, the rest were novel. Three patients had additional variations in genes having pathobiological relevance in other CMTs or amyotrophic lateral sclerosis. Conclusion We provide data on a cohort of patients of Indian origin with SH3TC2 variations and highlight differences from other cohorts. Though the majority were not symptomatic for hearing impairment, evoked potentials disclosed abnormalities in all. Further studies are required to establish the functional consequences of novel variants and their interacting molecular partners identified in the present study to strengthen their association with the phenotype.
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Affiliation(s)
- Madhu Nagappa
- Department of Neurology; Department of Neuromuscular Laboratory, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
| | - Shivani Sharma
- Department of Neurology; Department of Neuropathology; Department of Neuromuscular Laboratory, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
| | | | - Yasha T Chickabasaviah
- Department of Neuropathology; Department of Neuromuscular Laboratory, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
| | - Ramesh Siram
- Department of Neurology, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
| | - Akhilesh Shroti
- Department of Neurology, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
| | - Doniparthi V Seshagiri
- Department of Neurology, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
| | - Monojit Debnath
- Department of Human Genetics, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
| | - Sanjib Sinha
- Department of Neurology, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
| | - Parayil S Bindu
- Department of Neurology; Department of Neuromuscular Laboratory, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
| | - Arun B Taly
- Department of Neurology; Department of Neuromuscular Laboratory, Neurobiology Research Centre (NBRC), National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, Karnataka, India
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Higuchi Y, Takashima H. Clinical genetics of Charcot-Marie-Tooth disease. J Hum Genet 2023; 68:199-214. [PMID: 35304567 DOI: 10.1038/s10038-022-01031-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 03/02/2022] [Accepted: 03/06/2022] [Indexed: 02/08/2023]
Abstract
Recent research in the field of inherited peripheral neuropathies (IPNs) such as Charcot-Marie-Tooth (CMT) disease has helped identify the causative genes provided better understanding of the pathogenesis, and unraveled potential novel therapeutic targets. Several reports have described the epidemiology, clinical characteristics, molecular pathogenesis, and novel causative genes for CMT/IPNs in Japan. Based on the functions of the causative genes identified so far, the following molecular and cellular mechanisms are believed to be involved in the causation of CMTs/IPNs: myelin assembly, cytoskeletal structure, myelin-specific transcription factor, nuclear related, endosomal sorting and cell signaling, proteasome and protein aggregation, mitochondria-related, motor proteins and axonal transport, tRNA synthetases and RNA metabolism, and ion channel-related mechanisms. In this article, we review the epidemiology, genetic diagnosis, and clinicogenetic characteristics of CMT in Japan. In addition, we discuss the newly identified novel causative genes for CMT/IPNs in Japan, namely MME and COA7. Identification of the new causes of CMT will facilitate in-depth characterization of the underlying molecular mechanisms of CMT, leading to the establishment of therapeutic approaches such as drug development and gene therapy.
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Affiliation(s)
- Yujiro Higuchi
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Hiroshi Takashima
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
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Sun B, He ZQ, Li YR, Bai JM, Wang HR, Wang HF, Cui F, Yang F, Huang XS. Screening for SH3TC2 variants in Charcot-Marie-Tooth disease in a cohort of Chinese patients. Acta Neurol Belg 2021; 122:1169-1175. [PMID: 33587240 DOI: 10.1007/s13760-021-01605-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 01/18/2021] [Indexed: 11/28/2022]
Abstract
Mutations in the SH3TC2 gene cause Charcot-Marie-Tooth disease type 4C (CMT4C), characterized by inherited demyelinating peripheral neuropathy. CMT4C is a common form of CMT4/autosomal recessive (AR) CMT1. This study examined the SH3TC2 variants, investigated genotype-phenotype correlations and explored the frequency of CMT4C in Chinese patients. A total of 206 unrelated patients of Chinese Han descent clinically diagnosed with CMT were recruited. All patients underwent detailed history-taking, neurological examination, laboratory workups, and electrophysiological studies. Genetic analysis was performed via high-throughput target sequencing (NGS). Three patients, one male and two females, were found to carry five SH3TC2 mutations: patient 1 (c.3154C > T, p.R1054X; c.929G > A, p.G310E); Patient 2 (c.2872_2872del, p.S958fs; c.3710C > T, p.A1237V) and Patient 3 (c.2782C > T, p.Q928X; c.929G > A, p.G310E). The c.2872_2872del, c.3710C > T and c.2782C > T variants were not reported before. CMT4C caused by SH3TC2 mutation is a very common type of CMT4/AR CMT1. Three novel mutations, c.2872_2872del, c.3710C > T and c.2782C > T, were found in this study. Combination of clinical phenotype, nerve conduction studies, genetic analysis and bioinformatics analysis are of vital importance in patients suspected as CMT.
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Affiliation(s)
- Bo Sun
- Neurological Department of the First Medical Center, Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
- Geriatric Neurological Department of the Second Medical Center and National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing, 100853, China
| | - Zheng-Qing He
- Neurological Department of the First Medical Center, Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Yan-Ran Li
- Neurological Department of the First Medical Center, Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Jiong-Ming Bai
- Neurological Department of the First Medical Center, Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
- College of Medicine, Nankai University, Tianjin, China
| | - Hao-Ran Wang
- Neurological Department of the First Medical Center, Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
- College of Medicine, Nankai University, Tianjin, China
| | - Hong-Fen Wang
- Neurological Department of the First Medical Center, Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Fang Cui
- Neurological Department of the First Medical Center, Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Fei Yang
- Neurological Department of the First Medical Center, Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Xu-Sheng Huang
- Neurological Department of the First Medical Center, Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China.
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Duan X, Ma Y, Fan D, Liu X. Characteristics of Clinical and Electrophysiological Pattern in a Large Cohort of Chinese Patients With Charcot-Marie-Tooth 4C. Front Neurol 2021; 12:598168. [PMID: 33643188 PMCID: PMC7907161 DOI: 10.3389/fneur.2021.598168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 01/21/2021] [Indexed: 11/13/2022] Open
Abstract
The "Src homology 3 (SH3) domain and tetratricopeptide repeats 2" (SH3TC2) gene is mutated in individuals with Charcot-Marie-Tooth disease (CMT) and considered relevant to a demyelinating or intermediate subtype of CMT disease, CMT4C. In this study, we screened a cohort of 465 unrelated Chinese CMT patients alongside 650 controls. We used Sanger, next-generation, or whole-exome sequencing to analyze SH3TC2 and other CMT-related genes and identified 12 SH3TC2 variants (eight novel) in seven families. Of the eight novel variants, seven were likely pathogenic (c.280-2 A > G, c.732-1 G > A, c.1177+6 T > C, c.3328-1 G > A, G299S, R548W, L1048P), and 1 had uncertain significance (S221P). The CMT4C frequency was calculated to be 4.24% in demyelinating or intermediate CMT patients without PMP22 duplication. Additionally, we detected variant R954* in the Chinese cohort in our study, indicating that this variant may be present among Asians, albeit with a relatively low frequency. The onset age varied among the eight patients, three of whom presented scoliosis. We summarized phenotypes in the Chinese CMT cohort and concluded that the absence of scoliosis, cranial nerve involvement, or late-onset symptoms does not necessarily preclude SH3TC2 involvement in a given case.
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Affiliation(s)
- Xiaohui Duan
- Department of Neurology, China-Japan Friendship Hospital, Beijing, China
| | - Yan Ma
- Department of Neurology, Peking University Third Hospital, Beijing, China
| | - Dongsheng Fan
- Department of Neurology, Peking University Third Hospital, Beijing, China.,Key Laboratory for Neuroscience, Ministry of Education/National Health Commission, Peking University, Beijing, China
| | - Xiaoxuan Liu
- Department of Neurology, Peking University Third Hospital, Beijing, China
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Compound heterozygous mutations of SH3TC2 in Charcot-Marie-Tooth disease type 4C patients. J Hum Genet 2019; 64:961-965. [PMID: 31227790 DOI: 10.1038/s10038-019-0636-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 05/21/2019] [Accepted: 06/06/2019] [Indexed: 01/11/2023]
Abstract
Charcot-Marie-Tooth disease type 4C (CMT4C) is an autosomal recessive neuropathy caused by SH3TC2 mutations, characterized by spine deformities and cranial nerve involvement. This study identified four CMT4C families with compound heterozygous SH3TC2 mutations from 504 Korean demyelinating or intermediate CMT patients. The frequency of the CMT4C was calculated as 0.79% in demyelinating and intermediate patients (n = 504), but it was calculated as 2.02% in patients without PMP22 duplication (n = 198). The CMT4C frequency was similar to patients in Japan, but it was relatively low compared to those patients in other populations. The symptom was less severe and slowly progressed compared to the other AR-CMT. A patient harboring an intermediate neuropathy showed cranial nerve involvement but did not have scoliosis. This study will be helpful in making molecular diagnoses of demyelinating or intermediate CMT due to SH3TC2 mutations.
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