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  • Title: A novel 9-bp insertion in the GJB1 gene causing a mild form of X-linked CMT with late onset.
    Author: Vazza G, Merlini L, Bertolin C, Zortea M, Mostacciuolo ML.
    Journal: Neuromuscul Disord; 2006 Dec; 16(12):878-81. PubMed ID: 17052905.
    Abstract:
    X-linked Charcot-Marie-Tooth disease is the second most common variant of CMT. CMTX1 is caused by mutations in the GJB1 gene encoding for connexin 32. We describe an Italian family with an intermediate CMTX phenotype with late onset. Mutation screening of the GJB1 gene revealed a 9-bp duplication leading to the insertion of three aminoacids (Thr-Val-Phe) between the end of the second extracellular domain and the beginning of the fourth transmembrane domain. This is the third in-frame insertion in the GJB1 gene identified so far and, like the previous ones, it consists in the duplication of the flanking sequence which is repeated in tandem in the wild-type gene.
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