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  • Title: [Variant analysis for a pedigree affected with limb-girdle muscular dystrophy type 2D].
    Author: Ding L, Tang S, Li H, Xu X, Luan Z, Zhang Q, Lyu J.
    Journal: Zhonghua Yi Xue Yi Chuan Xue Za Zhi; 2019 Feb 10; 36(2):136-139. PubMed ID: 30703231.
    Abstract:
    OBJECTIVE: To analyze variant of SGCA gene in a Chinese pedigree affected with limb-girdle muscular dystrophy type 2D with whole exome sequencing (WGS). METHODS: Multiplex ligation-dependent probe amplification (MLPA) was employed to detect large fragment deletion or duplication of the DMD gene. FastTargetTM next generation sequencing was used to detect variants of the DMD gene, and the result was verified by Sanger sequencing. After excluding the diagnosis of DMD for the proband, WGS was applied to test the proband and his parents. Suspected pathogenic variants were validated by Sanger sequencing. RESULTS: No variant, deletion or duplication of the DMD gene was detected. Whole exome sequencing showed that the proband has carried compound heterozygous missense variants c.409G>A (p.Glu137Lys) and c.409G>C (p.Glu137Gln) in exon 5 of the SGCA gene, which were respectively inherited from his mother and father. Neither variant was found in DNA derived from the cord blood sample. CONCLUSION: The c.409G>A (p.Glu137Lys) and c.409G>C (p.Glu137Gln) compound heterozygous missense variants probably underlie the disease in the proband. Above finding has facilitated genetic counseling and prenatal diagnosis for the family.
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