Güneydoğu Anadolu'daki işitme engellilerde GJB2 mutasyonlarının sıklığı
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Date
2008
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Biyoteknoloji Enstitüsü
Abstract
Prelingual deafness occurs with a frequency of approximately 1 in 1000 children. More than 50% of prelingual deafness is caused by genetic factors in developed countries, while remaining is environmentally caused.Affected individuals who are classified certainly of the genetic cases are divided into syndromic and non-syndromic forms. 70% of these cases with genetic origin are referred to as having the non-syndromic form because of absent additional findings. The most common form of hereditary hearing loss is transmitted with autosomal recessive inheritance. Non-syndromic hearing loss may be familial or sporadic. Mutations in GJB2 have been identified among the deaf living in many countries, 35delG being the most common mutation in Caucasoid populations. The GJB2 gene is mapped to the DFNB1 locus at chromosome 13q12, is the main gene for prelingual hearing loss.Previous studies completed in Turkey have determined that the mutation frequency of GJB2 in the deaf population varies from region to region. In those studies, the number of included families from Southeast Anatolia was not sufficient. In this study, unrelated 45 probands, who originated from Southeast Anatolia, with non-syndromic congenital or prelingual onset sensorineural hearing loss have been studied. Mutations in the coding and not coding exons of the GJB2 gene were screened with PCR-RFLP, PCR-SSCP and DNA sequencing methods. Biallelic GJB2 mutations were detected in seven families (7/45=15.5% ; 95% confidence interval of 5% to 26%).Our results show that GJB2 mutations are an important cause of the hearing loss in Southeast Anatolia. However, they are relatively less common compared to those observed in other parts of Anatolia.
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Moleküler Tıp, Çocuk Sağlığı ve Hastalıkları