Identification of a novel c.1A>G variant of GDAP1 gene in a pedigree affected with autosomal recessive fibula atrophy

Abstract

To explore the genetic basis for a pedigree affected with Charcot-Marie-Tooth (CMT) disease through high-throughput sequencing. Potential variants of the genes associated with CMT were screened by next-generation sequencing (NGS) of the members of the pedigree. NGS has revealed that the two affected sisters both harbored homozygous c.1A>G variant of the GDAP1 gene, which caused replacement of the first amino acid Methionine by Valine (p.Met1Val). Their parents were both carriers of the heterozygous c.1A>G variant. The variant was unreported previously and has an extremely low frequency in the population. Meanwhile, one of the sisters and the mother also carried heterozygous c.710A>T variant of the BAG3 gene. The homozygous c.1A>G variant of the GDAP1 gene probably underlay the CMT in both children. Above result has enabled clinical diagnosis and genetic counseling for this pedigree.