title: Analysis of the presence of the GJB6 mutations in patients heterozygous for GJB2 mutation in Brazil.
abstract: Mutations in the GJB2 gene, mainly 35delG, are responsible for most autosomal recessive inherited genetic hearing loss. The audiometric standard of these hearing losses remains inconsistent and other genes, such as GJB6, have been involved in association with GJB2. The objective of the study was to identify the deletions del(GJB6-D13S1830) and del(GJB6-D13S1854) in patients heterozygous for 35delG/GJB2 and analyze the phenotype they present. 101 patients with mild to profound degree of sensorineural hypoacusis were evaluated. The allele-specific PCR technique was used to identify 35delG. The del(GJB6-D13S1830) and del(GJB6-D13S1854) were identified through the PCR multiplex technique. 90% of the subjects presented a normal genotype for the analyzed mutations; 6.93% were shown to be heterozygous for 35delG/GJB2 and 1% presented compound heterozygosis GJB2/GJB6). The data found reinforced the hypothesis of an interaction of more than one gene as the cause of autosomal recessive genetic hearing loss and emphasized the importance of an early diagnosis for appropriate intervention.
authors.affiliation: Marília Medical School, Avenida José Ariano Rodrigues, 527, Lins, SP, CEP 16400-400, Brazil, carolnorte@yahoo.com.
authors.forename: Maria Carolina Braga Norte
authors.initials: MC
authors.lastname: Esteves
authors.forename: Myriam
authors.initials: M
authors.lastname: de Lima Isaac
authors.forename: Anete Maria
authors.initials: AM
authors.lastname: Francisco
authors.forename: Wilson Araújo
authors.initials: WA
authors.lastname: da Silva Junior
authors.forename: Cristiane Ayres
authors.initials: CA
authors.lastname: Ferreira
authors.forename: Ana Helena Banwart
authors.initials: AH
authors.lastname: Dell'Aringa
mesh_terms: D001299:Audiometry; D001938:Brazil; D015331:Cohort Studies; D000072259:Connexin 26; D000075302:Connexin 30; D017630:Connexins / Q000235:genetics*; D005260:Female; D017353:Gene Deletion; D056726:Genetic Association Studies; D006319:Hearing Loss, Sensorineural / Q000235:genetics*; D006579:Heterozygote; D006801:Humans; D008297:Male; D012720:Severity of Illness Index
chemical_list: D000075302:Connexin 30; D017630:Connexins; C000607042:GJB2 protein, human; C491020:GJB6 protein, human; D000072259:Connexin 26
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