GJB1 Gene Analysis in Two Extended Families with X-Linked Charcot-Marie-Tooth Disease

Funding Information: The study was carried out using the internal research grant in Riga Stradins University. Publisher Copyright: © 2021 The Author(s). Published by S. Karger AG, Basel.X-linked Charcot-Marie-Tooth (CMT) disease type I (CMTX1) is the second most frequent type of CMT disease caused by pathogenic variants in the GJB1 gene. We described 2 extended cases (families) with CMTX1 with identified pathogenic variants - p.Val139Met and p.Arg215Trp. In both the families, neurological symptoms started earlier in male than in female patients. In some family members, molecular diagnostics was performed prior to neurological investigation due to family cascade screening. There was variable neurological phenotype representing CMT. Conclusions: There is a large clinical heterogeneity in CMTX, even amongst the family members.Peer reviewe