Compound heterozygous DYSF variants causing limb‐girdle muscular dystrophy type 2B in a Chinese family. (28th September 2020)

• Record Type: Journal Article
• Authors: Li, Liangshan; Jing, Zhongcui; Cheng, Lei; Liu, Wenmiao; Wang, Haiyan; Xu, Yinglei; Zheng, Xueping; Yu, Xiaoling; Liu, Shiguo
• Is Part Of: Journal of gene medicine. Volume 22:Number 11(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-28
• Subjects: dysferlin -- DYSF gene -- limb‐girdle muscular dystrophy type 2B -- variants -- whole exome sequencing; Genetic transformation -- Periodicals; Gene Transfer -- Periodicals; Gene Therapy -- Periodicals; 616.042
• DOI: 10.1002/jgm.3272
• Languages: English
• ISSNs: 1099-498X

Abstract

Abstract: Background: The dysferlin gene or the DYSF gene encodes the Ca 2+ ‐dependent phospholipid‐binding protein dysferlin, which belongs to the ferlin family and is associated with muscle membrane regeneration and repair. Variants in the DYSF gene are responsible for limb‐girdle muscular dystrophy type 2B (LGMD2B), also called limb‐girdle muscular dystrophy recessive 2 (LGMDR2), a rare subtype of muscular dystrophy involving progressive muscle weakness and atrophy. The present study aimed to identify the variants responsible for the clinical symptoms of a Chinese patient with limb girdle muscular dystrophies (LGMDs) and to explore the genotype–phenotype associations of LGMD2B. Methods: A series of clinical examinations, including blood tests, magnetic resonance imaging scans for the lower legs, electromyography and muscle biopsy, was performed on the proband diagnosed with muscular dystrophies. Whole exome sequencing was conducted to detect the causative variants, followed by Sanger sequencing to validate these variants. Results: We identified two compound heterozygous variants in the DYSF gene, c.1058 T>C, p.(Leu353Pro) in exon 12 and c.1461C>A/p.Cys487* in exon 16 in this proband, which were inherited from the father and mother, respectively. In silico analysis for these variants revealed deleterious results by PolyPhen‐2 (Polymorphism Phenotyping v2; http://genetics.bwh.harvard.edu/pph2 ), SIFT (Sorting Intolerant From Tolerant; https://sift.bii.a-star.edu.sg ), PROVEAN (Protein Variation Effect Analyzer; http://provean.jcvi.org/seq_submit.php ) and MutationTaster (http://www.mutationtaster.org ). In addition, the two compound heterozygous variants in the proband were absent in 100 control individuals who had an identical ethnic origin and were from the same region, suggesting that these variants may be the pathogenic variants responsible for the LGMD2B phenotypes for this proband. Conclusions: The present study broadens our understanding of the mutational spectrum of the DYSF gene, which provides a deep insight into the pathogenesis of LGMDs and accelerates the development of a prenatal diagnosis. Abstract : We identified two compound heterozygous variants in the DYSF gene, c.1058 T>C, p.(Leu353Pro) in exon 12 and c.1461C>A/p.Cys487* in exon 16, by performing whole exome sequencing in a female patient diagnosed with muscular dystrophies, which were inherited from the father and mother, respectively.