Autosomal dominant hearing loss resulting from p.R75Q mutation in the GJB2 gene: nonsyndromic presentation in a South Indian family.
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.
Department of Genetics, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Taramani Campus, Chennai, India.
Amritkumar
A
Pavithra
Mathiyalagan
M
Selvakumari
Venkatesan
V
Nityaa
Narasimhan
N
Sharanya
Rajagopalan
R
Ramakrishnan
Murali
M
Narasimhan
C R Srikumari
CR
Srisailapathy
D000072259:Connexin 26; D000075302:Connexin 30; D017630:Connexins / Q000235:genetics*; D004252:DNA Mutational Analysis; D003638:Deafness / Q000235:genetics; D005260:Female; D006801:Humans; D007194:India; D040582:Inheritance Patterns; D008297:Male; D010375:Pedigree; D012867:Skin / Q000473:pathology
D000075302:Connexin 30; D017630:Connexins; C000607042:GJB2 protein, human; C491020:GJB6 protein, human; D000072259:Connexin 26
GJB2 mutations; assortative mating; autosomal dominant; nonsyndromic hearing loss; p.R75Q mutation; palmoplantar keratoderma; south India