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A novel TFG c.793C>G mutation in a Chinese pedigree with Charcot-Marie-Tooth disease 2. | LitMetric

A novel TFG c.793C>G mutation in a Chinese pedigree with Charcot-Marie-Tooth disease 2.

Brain Behav

Department of Neurology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.

Published: September 2020

AI Article Synopsis

Article Abstract

Introduction: Mutations within TFG gene were recently reported to cause Charcot-Marie-Tooth disease 2 (CMT2). However, only few pedigrees were documented so far. Here, we reported a Chinese CMT2 pedigree with 8 affected cases and a novel TFG mutation.

Methods: Clinical evaluation and electrophysiological study were performed in all the affected individuals. Whole-exome sequencing was conducted, followed by the Sanger sequencing and co-segregation analysis to verify the variants.

Results: All cases presented with a phenotype of CMT2, including slowly progressive symmetrical muscle atrophy and weakness predominantly in the distal limbs. Sensory loss in the distal limbs was present in the proband and his father. Age at onset ranged from 37 to 44 years, and was younger in male cases, compared with female cases. Nerve conduction study revealed normal motor nerve conduction velocity but decreased compound muscle action potential. Electromyography test revealed fibrillation potential and positive sharp waves. The creatine kinase activity was increased in all cases. After genetic investigations, we identified a novel TFG c.793C>G (p.Pro265Ala) mutation in the family. This mutation alters the conserved amino acid residue and is absent in 1000G, ExAC, dbSNP, EP6500, and 200 in-house controls. It co-segregated with the disease in the family.

Conclusions: Our report provided additional evidence that the heterozygous TFG mutations were associated with CMT2.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7507360PMC
http://dx.doi.org/10.1002/brb3.1724DOI Listing

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