Author/Authors :
Hashemzadeh Chaleshtori, M Tehran University of Medical Sciences , Dowlati, M Sciences and Research branch Islamic Azad University - Tehran , Farhud, DD Tehran University of Medical Sciences , Hoghooghi Rad, L Sciences and Research branch Islamic Azad University - Tehran , Sasanfar, R Ministry of Education and Training of the Islamic Republic of Iran , Hoseinipour, A Ministry of Education and Training of the Islamic Republic of Iran , Montazer Zohour, M Tehran University of Medical Sciences , Tolooi, A Ministry of Education and Training of the Islamic Republic of Iran , Ghadami, M Ministry of Education and Training of the Islamic Republic of Iran , Pourjafari, HR Hamadan University of Medical Sciences , Oshaghi, MA Tehran University of Medical Sciences , Patton, MA St George’s Hospital Medical School - University of London - London UK
Abstract :
Mutations in the GJB2 gene encoding Connexin 26 (Cx26) protein are a major cause for autosomal recessive non syndromic and sporadic deafness in many populations. In this study we have investigated the prevalence of the GJB2 gene mutations using nested PCR pre screening strategy and direct sequencing method. Two hundred and sixty autosomal recessive non syndromic and sporadic deaf subjects from 199 families in two provinces of Iran (Gilan and Khorasan) were studied. Altogether 14 different genetic variants were identified from which 2 were novel variant (327delG+G109G and 431insC). Eight GJB2 mutations including 35delG, 235delC, W77X, R127H, M34T, V27I+E114G, L90P and delE120 were also found in 54 of 199 families (27%). Four polymorphysms V27I, S86T, V153I and G160S also were detected. Thirty two of 199 families were observed to have GJB2 mutations in both alleles (16%). The most common mutation was 35delG so that 43 out of 55 GJB2 mutations (78.2%) contained 35delG mutation.
Keywords :
Connexin 26 , GJB2 , Deafness , ARNSHL , Iran
