[Spectrum and frequency of mutations in the connexin 32 gene (GJB1) in hereditary and sensory neuropathy type 1X patients from Bashkortostan].

Hereditary motor and sensory neuropathy type 1X (HMSN 1X) is the second most frequent form of demyelinating polyneuropathies and is caused by mutations in the gene for connexin 32 protein (Cx32, GJB1). The contribution of HMSN 1X to the structure of HMSN in the Republic of Bashkortostan was determined. The GJB1 mutations were detected in 18 out of 131 unrelated patients, which constituted 13.7%. The four missense mutations identified were represented by: Pro87Ala (c.259C>G) with the frequency of 10%; Arg22Gln (c.65G>A) (2.98%); Arg15Gln (c.44G>A); and Thr86Ile (c.257C