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Chen Y, Wu W, Wang P, Yip P, Wu Y, Lin Y, Lin W. Novel five nucleotide deletion in dysferlin leads to autosomal recessive limb-girdle muscular dystrophy. Physiol Rep 2023; 11:e15887. [PMID: 38110300 PMCID: PMC10727958 DOI: 10.14814/phy2.15887] [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: 07/12/2023] [Revised: 12/01/2023] [Accepted: 12/02/2023] [Indexed: 12/20/2023] Open
Abstract
Muscular dystrophy (MD) is a genetic disorder that causes progressive muscle weakness and degeneration. Limb-girdle muscular dystrophy (LGMD) is a type of MD that mainly causes muscle atrophy within the shoulder and pelvic girdles. LGMD is classified into autosomal dominant (LGMD-D) and autosomal recessive (LGMD-R) inheritance patterns. Mutations in the Dysferlin gene (DYSF) are common causes of LGMD-R. However, genetic screening of DYSF mutations is rare in Taiwan. Herein, we identified a novel c.2867_2871del ACCAG deletion and a previously reported c.937+1G>A mutation in DYSF from a Taiwanese family with LGMD. The primary symptoms of both siblings were difficulty climbing stairs, walking on the toes, and gradually worsening weakness in the proximal muscles and increased creatine kinase level. Through pedigree analysis and sequencing, two siblings from this family were found to have compound heterozygous DYSF mutations (c. 937+1G>A and c. 2867_2871del ACCAG) within the separated alleles. These mutations induced early stop codons; if translated, truncated DYSF proteins will be expressed. Or, the mRNA products of these two mutations will merit the nonsense-mediated decay, might result in no dysferlin protein expressed. To our knowledge, this is the first report of a novel c.2867_2871del ACCAG deletion in DYSF. Further research is required to examine the effects of the novel DYSF mutation in Taiwanese patients with LGMD.
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Affiliation(s)
- Yen‐Lin Chen
- Center for Precision Medicine and Genomics, Tri‐Service General HospitalMedical Defense Medical CenterTaipeiTaiwan
- Department of Pathology, Tri‐Service General HospitalMedical Defense Medical CenterTaipeiTaiwan
| | - Wen‐Bin Wu
- School of Medicine, College of MedicineFu Je Catholic UniversityNew Taipei CityTaiwan
| | - Pei Wang
- School of Medicine, College of MedicineFu Je Catholic UniversityNew Taipei CityTaiwan
| | - Ping‐Keung Yip
- School of Medicine, College of MedicineFu Je Catholic UniversityNew Taipei CityTaiwan
- Division of NeurologyCardinal Tien HospitalNew Taipei CityTaiwan
| | - Yi‐No Wu
- School of Medicine, College of MedicineFu Je Catholic UniversityNew Taipei CityTaiwan
| | - Ying‐Hung Lin
- Graduate Institute of Biomedical and Pharmaceutical ScienceFu Jen Catholic UniversityNew Taipei CityTaiwan
| | - Wei‐Ning Lin
- Graduate Institute of Biomedical and Pharmaceutical ScienceFu Jen Catholic UniversityNew Taipei CityTaiwan
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Huang X, Tan D, Zhang Z, Ge L, Liu J, Ding J, Yang H, Wei C, Chang X, Yuan Y, Yan C, Xiong H. Unique genotype-phenotype correlations within LAMA2-related limb girdle muscular dystrophy in Chinese patients. Front Neurol 2023; 14:1158094. [PMID: 37206914 PMCID: PMC10190595 DOI: 10.3389/fneur.2023.1158094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 03/21/2023] [Indexed: 05/21/2023] Open
Abstract
Background LAMA2-related limb girdle muscular dystrophy (LGMD R23) is rare. The detailed clinical phenotypes and genetic information associated with LGMD R23 are unknown. Methods We conducted a retrospective cross-sectional and longitudinal study on 19 LGMD R23 patients. Results Normal early motor development was observed in 84.2% patients. Mild orthopedic complications were observed in 42.1% patients. 36.8% patients had seizures, which is unusually frequent in LGMD. Epilepsy was eventually diagnosed in 26.3% patients. 46.7% patients presented with motor neuropathy. Genetic analysis identified 29 pathogenic variants, with missense and frameshift variants being the most common. The mutant sites were mainly distributed in the N-terminal and G-like domains of laminin. The missense variants are distributed near the N-terminus (exons 3-11), whereas frameshift variants are distributed in exons 12-65. Five patients were diagnosed with epilepsy and all of them harbor at least one missense variants in exon 4. 71.4% variants of patients with motor neuropathy located in the LN domain. Conclusions Missense variants in exon 4 maybe correlated with epilepsy and variants in the LN domain maybe correlated with motor neuropathy in Chinese patients. Our study expands the clinical and genetic spectrum caused by LAMA2 variations and provides novel genotype-phenotype correlations of LGMD R23.
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Affiliation(s)
- Xiuli Huang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Dandan Tan
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Zaiqiang Zhang
- Department of Neurology, China National Clinical Research Center for Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Lin Ge
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Jieyu Liu
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Juan Ding
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Haipo Yang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Cuijie Wei
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Xingzhi Chang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Yun Yuan
- Department of Neurology, Peking University First Hospital, Beijing, China
| | - Chuanzhu Yan
- Department of Neurology, Research Institute of Neuromuscular and Neurodegenerative Disease, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Hui Xiong
- Department of Pediatrics, Peking University First Hospital, Beijing, China
- Beijing Key Laboratory of Molecular Diagnosis and Study on Pediatric Genetic Diseases, Beijing, China
- *Correspondence: Hui Xiong
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Koczwara KE, Lake NJ, DeSimone AM, Lek M. Neuromuscular disorders: finding the missing genetic diagnoses. Trends Genet 2022; 38:956-971. [PMID: 35908999 DOI: 10.1016/j.tig.2022.07.001] [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: 04/15/2022] [Revised: 07/01/2022] [Accepted: 07/04/2022] [Indexed: 11/24/2022]
Abstract
Neuromuscular disorders (NMDs) are a wide-ranging group of diseases that seriously affect the quality of life of affected individuals. The development of next-generation sequencing revolutionized the diagnosis of NMD, enabling the discovery of hundreds of NMD genes and many more pathogenic variants. However, the diagnostic yield of genetic testing in NMD cohorts remains incomplete, indicating a large number of genetic diagnoses are not identified through current methods. Fortunately, recent advancements in sequencing technologies, analytical tools, and high-throughput functional screening provide an opportunity to circumvent current challenges. Here, we discuss reasons for missing genetic diagnoses in NMD, how emerging technologies and tools can overcome these hurdles, and examine future approaches to improving diagnostic yields in NMD.
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Affiliation(s)
- Katherine E Koczwara
- Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Nicole J Lake
- Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Alec M DeSimone
- Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Monkol Lek
- Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA.
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