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Autosomal Dominant Hearing Loss resulting from p.R75Q Mutation in the GJB2 Gene: Nonsyndromic presentation in a South Indian Family
Author(s) -
Pavithra Amritkumar,
Selvakumari Mathiyalagan,
Nityaa Venkatesan,
Sharanya Narasimhan,
Ramakrishnan Rajagopalan,
Narasimhan Murali,
Srisailapathy C.R. Srikumari
Publication year - 2015
Publication title -
annals of human genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.537
H-Index - 77
eISSN - 1469-1809
pISSN - 0003-4800
DOI - 10.1111/ahg.12086
Subject(s) - hearing loss , genetics , mutation , connexin , gene , gene mutation , biology , medicine , audiology , gap junction , intracellular
Summary Mutations in the GJB2 gene encoding the gap junction protein Connexin 26 have been associated with autosomal recessive as well as dominant nonsyndromic hearing loss. Owing to the involvement of connexins in skin homeostasis, GJB2 mutations have also been associated with syndromic forms of hearing loss showing various skin manifestations. We report an assortatively mating hearing impaired family of south Indian origin with three affected members spread over two generations, having p.R75Q mutation in the GJB2 gene in the heterozygous condition. The inheritance pattern was autosomal dominant with mother and son being affected. Dermatological and histopathologic examinations showed absence of palmoplantar keratoderma. To the best of our knowledge, this is the first report from India on p.R75Q mutation in the GJB2 gene with nonsyndromic hearing loss.