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Kokotas, Haris; Van Laer, Lut; Grigoriadou, Maria; Iliadou, Vassiliki; Economides, John; Pomoni, Stella; Pampanos, Andreas; Eleftheriades, Nikos; Ferekidou, Elisabeth; Korres, Stavros; Giannoulia-Karantana, Aglaia; Van Camp, Guy; Petersen, Michael B.
American journal of medical genetics. Part A, 15 November 2008, Letnik: 146A, Številka: 22Journal Article
Approximately one in 1,000 children is affected by severe or profound hearing loss at birth or during early childhood (prelingual deafness). Up to 40% of congenital, autosomal recessive, severe to profound hearing impairment cases result from mutations in a single gene, GJB2, that encodes the connexin 26 protein. One specific mutation in this gene, 35delG, accounts for the majority of GJB2 mutations detected in Caucasian populations. Some previous studies have assumed that the high frequency of the 35delG mutation reflects the presence of a mutational hot spot, while other studies support the theory of a common founder. Greece is among the countries with the highest carrier frequency of the 35delG mutation (3.5%), and a recent study raised the hypothesis of the origin of this mutation in ancient Greece. We genotyped 60 Greek deafness patients homozygous for the 35delG mutation for six single nucleotide polymorphisms (SNPs) and two microsatellite markers inside or flanking the GJB2 gene. The allele distribution in the patients was compared to 60 Greek normal hearing controls. A strong linkage disequilibrium was found between the 35delG mutation and markers inside or flanking the GJB2 gene. Furthermore, we found a common haplotype with a previous study, suggesting a common founder for the 35delG mutation. © 2008 Wiley‐Liss, Inc.
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