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Ozisik O, Gorokhova S, Cerino M, Bartoli M, Baudot A. System-level analysis of genes mutated in muscular dystrophies reveals a functional pattern associated with muscle weakness distribution. Sci Rep 2024; 14:11225. [PMID: 38755190 PMCID: PMC11099060 DOI: 10.1038/s41598-024-60761-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 04/25/2024] [Indexed: 05/18/2024] Open
Abstract
Muscular dystrophies (MDs) are inherited genetic diseases causing weakness and degeneration of muscles. The distribution of muscle weakness differs between MDs, involving distal muscles or proximal muscles. While the mutations in most of the MD-associated genes lead to either distal or proximal onset, there are also genes whose mutations can cause both types of onsets. We hypothesized that the genes associated with different MD onsets code proteins with distinct cellular functions. To investigate this, we collected the MD-associated genes and assigned them to three onset groups: genes mutated only in distal onset dystrophies, genes mutated only in proximal onset dystrophies, and genes mutated in both types of onsets. We then systematically evaluated the cellular functions of these gene sets with computational strategies based on functional enrichment analysis and biological network analysis. Our analyses demonstrate that genes mutated in either distal or proximal onset MDs code proteins linked with two distinct sets of cellular processes. Interestingly, these two sets of cellular processes are relevant for the genes that are associated with both onsets. Moreover, the genes associated with both onsets display high centrality and connectivity in the network of muscular dystrophy genes. Our findings support the hypothesis that the proteins associated with distal or proximal onsets have distinct functional characteristics, whereas the proteins associated with both onsets are multifunctional.
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Affiliation(s)
- Ozan Ozisik
- Aix Marseille University, INSERM, MMG, Marseille, France.
- Université Paris Cité, INSERM U976, Paris, France.
| | - Svetlana Gorokhova
- Aix Marseille University, INSERM, MMG, Marseille, France
- Department of Medical Genetics, La Timone Hospital, AP-HM, Marseille, France
| | - Mathieu Cerino
- Aix Marseille University, INSERM, MMG, Marseille, France
- Department of Medical Genetics, La Timone Hospital, AP-HM, Marseille, France
- Laboratory of Biochemistry, La Conception Hospital, AP-HM, Marseille, France
| | - Marc Bartoli
- Aix Marseille University, INSERM, MMG, Marseille, France
- CNRS, Marseille, France
| | - Anaïs Baudot
- Aix Marseille University, INSERM, MMG, Marseille, France.
- CNRS, Marseille, France.
- Barcelona Supercomputing Center, Barcelona, Spain.
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Chen Z, Saini M, Koh JS, Prasad K, Koh SH, Tay KSS, Lee M, Tan YJ, Ng ASL, Tay SKH, Tan KB, Tandon A, Tan JMM, Chai JYH. Unique Clinical, Radiological and Histopathological Characteristics of a Southeast Asian Cohort of Patients with Limb-Girdle Muscular Dystrophy 2G/LGMD-R7-Telethonin-Related. J Neuromuscul Dis 2023; 10:91-106. [PMID: 36463458 DOI: 10.3233/jnd-221517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIM We describe a cohort of five patients with limb-girdle muscular dystrophy (LGMD) 2G/LGMD-R7 in a South-east Asian cohort. BACKGROUND LGMD2G/LGMD-R7-telethonin-related is caused by mutations in the TCAP gene that encodes for telethonin. METHODS We identified consecutive patients with LGMD2G/LGMD-R7-telethonin-related, diagnosed at the National Neuroscience Institute (NNI) and National University Hospital (NUH) between January 2000 and June 2021. RESULTS At onset, three patients presented with proximal lower limb weakness, one patient presented with Achilles tendon contractures, and one patient presented with delayed gross motor milestones. At last follow up, three patients had a limb girdle pattern of muscle weakness and two had a facioscapular humeral pattern of weakness. Whole body muscle MRI performed for one patient with a facioscapular-humeral pattern of weakness showed a pattern of muscle atrophy similar to facioscapular-humeral dystrophy. One patient had histological features consistent with myofibrillar myopathy; electron microscopy confirmed the disruption of myofibrillar architecture. One patients also had reduced staining to telethonin antibody on immunohistochemistry. CONCLUSION We report the unique clinical and histological features of a Southeast Asian cohort of five patients with LGMD2G/LGMD-R7-telethonin-related muscular dystrophy and further expand its clinical and histopathological spectrum.
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Affiliation(s)
- Zhiyong Chen
- Department of Neurology, National Neuroscience Institute, Singapore
| | - Monica Saini
- Department of Neurology, National Neuroscience Institute, Singapore
| | - Jasmine S Koh
- Department of Neurology, National Neuroscience Institute, Singapore
| | - Kalpana Prasad
- Department of Neurology, National Neuroscience Institute, Singapore
| | - Swee Hoon Koh
- Neuromuscular Laboratory, National Neuroscience Institute, Singapore
| | - Karine S S Tay
- Neuromuscular Laboratory, National Neuroscience Institute, Singapore
| | - Ming Lee
- Department of Pathology, Singapore General Hospital, Singapore
| | - Yi Jayne Tan
- Department of Neurology, National Neuroscience Institute, Singapore
| | - Adeline S L Ng
- Department of Neurology, National Neuroscience Institute, Singapore.,Duke NUS Graduate Medical School, Singapore
| | - Stacey Kiat Hong Tay
- Department of Paediatrics, Khoo Teck Puat-National University Children's Medical Institute, National University Health System, Singapore.,Department of Paediatrics, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Kong Bing Tan
- Department of Pathology, National University Hospital, Singapore
| | - Ankit Tandon
- Department of Diagnostic Radiology, Tan Tock Seng Hospital, Singapore
| | - Jeane M M Tan
- Department of Neurology, National Neuroscience Institute, Singapore
| | - Josiah Y H Chai
- Department of Neurology, National Neuroscience Institute, Singapore.,Neuromuscular Laboratory, National Neuroscience Institute, Singapore
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Lv X, Zhang R, Xu L, Wang G, Yan C, Lin P. Tcap Deficiency in Zebrafish Leads to ROS Production and Mitophagy, and Idebenone Improves its Phenotypes. Front Cell Dev Biol 2022; 10:836464. [PMID: 35372370 PMCID: PMC8964517 DOI: 10.3389/fcell.2022.836464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 02/22/2022] [Indexed: 11/21/2022] Open
Abstract
Limb-girdle muscular dystrophy 2G (LGMD2G) is a subtype of limb-girdle muscular dystrophy. However, the disease’s mechanisms are still not fully understood, and no established therapeutic targets have been found. Using a morpholino-based knockdown approach, we established an LGMD2G zebrafish model. In this study, we found that the ROS level increased in LGMD2G zebrafish. The expression of the mitophagy-related protein BNIP3L, LC3A-II/LC3A-I, and LAMP1 were increased in LGMD2G zebrafish. The oxygen consumption rate and citrate synthase expression was significantly decreased. Thus, mitophagy was presumed to be involved in the LGMD2G to reduce ROS levels. Then, we administered vitamin C, coenzyme Q10, idebenone, metformin, or dexamethasone to rescue LGMD2G in zebrafish. Idebenone reduced the curly tail phenotype and ROS level. Also, it reduced BNIP3L expression in LGMD2G zebrafish models and improved their motor function. In conclusion, mitophagy might be involved in the LGMD2G, and idebenone ameliorated LGMD2G by downregulating ROS level.
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Affiliation(s)
- Xiaoqing Lv
- Department of Neurology and Research Institute of Neuromuscular and Neurodegenerative Diseases, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Rui Zhang
- Department of Neurology and Research Institute of Neuromuscular and Neurodegenerative Diseases, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Ling Xu
- Department of Neurology and Research Institute of Neuromuscular and Neurodegenerative Diseases, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Guangyu Wang
- Department of Neurology and Research Institute of Neuromuscular and Neurodegenerative Diseases, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Chuanzhu Yan
- Department of Neurology and Research Institute of Neuromuscular and Neurodegenerative Diseases, Qilu Hospital, Shandong University, Jinan, China
| | - Pengfei Lin
- Department of Neurology and Research Institute of Neuromuscular and Neurodegenerative Diseases, Qilu Hospital, Shandong University, Jinan, China
- *Correspondence: Pengfei Lin,
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Findings of limb-girdle muscular dystrophy R7 telethonin-related patients from a Chinese neuromuscular center. Neurogenetics 2022; 23:37-44. [PMID: 34982307 DOI: 10.1007/s10048-021-00681-2] [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: 10/12/2021] [Accepted: 12/23/2021] [Indexed: 12/29/2022]
Abstract
Limb-girdle muscular dystrophy (LGMD) is a group of clinically and genetically heterogeneous neuromuscular disorders. LGMD-R7, which is caused by telethonin gene (TCAP) mutations, is one of the rarest forms of LGMD, and only a small number of LGMD-R7 cases have been described and mostly include patients from Brazil. A total of two LGMD-R7 patients were enrolled at a Chinese neuromuscular center. Demographic and clinical data were collected. Laboratory investigations and electromyography were performed. Routine and immunohistochemistry staining of muscle specimens was performed, and a next-generation sequencing panel array for genes associated with hereditary neuromuscular disorders was used for analysis. The patients exhibited predominant muscle weakness. Electromyography revealed myopathic changes. The muscle biopsy showed myopathic features, such as increased fiber size variation, muscle fiber atrophy and regeneration, slight hyperplasia of the connective tissue, and disarray of the myofibrillar network. Two patients were confirmed to have mutations in the open reading frame of TCAP by next-generation sequencing. One patient had compound heterozygous mutations, and the other patient harbored a novel homozygous mutation. Western blotting analysis of the skeletal muscle lysate confirmed the absence of telethonin in the patients. We described two LGMD-R7 patients presenting a classical LGMD phenotype and a novel homozygous TCAP mutation. Our research expands the spectrum of LGMD-R7 due to TCAP mutations based on patients from a Chinese neuromuscular center.
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Clinical, pathological, and molecular genetic analysis of 7 Chinese patients with hereditary myopathy with early respiratory failure. Neurol Sci 2021; 43:3371-3380. [PMID: 34839411 DOI: 10.1007/s10072-021-05783-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 11/21/2021] [Indexed: 10/19/2022]
Abstract
Hereditary myopathy with early respiratory failure (HMERF) is a subtype of myofibrillar myopathy. Mutations located on exon 344 of the titin-A band, the 119th fibronectin-3 domain (FN3 119), are responsible for HMERF. In this article, we retrospectively analyzed the clinical features, findings of muscle imaging, muscle pathology, immunohistochemistry, and ultrastructural characteristics of seven patients diagnosed with HMERF at a single center in China. Muscle MRI showed the involvement of semitendinosus in four patients. The common pathological features were variability in fiber diameter, increased internal nuclei, endomysial fibrosis, and cytoplasmic bodies. On immunohistochemical examination, the cytoplasmic bodies stained positive for calpain-3, p53, and programmed death-ligand 1. Electron microscopy showed cytoplasmic bodies, distorted sarcomere architecture, glycogen pool, and subsarcolemmal accumulation of mitochondria and lysosomes. We retrospectively reviewed four reported HMERF patients in China. Among the 11 patients, the median age at onset was 34 years (range 14-54). Allelic frequency of mutation c.95195C > T was 36.36%. This study characterizes the phenotype and genotype spectrum of HMERF in China.
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