Particular distribution of the GJB2/GJB6 gene mutations in Mexican population with hearing impairment
| Autor: | Sergio A. Cuevas-Covarrubias, Francisco Loeza-Becerra, Mirna Martínez-Saucedo, Héctor Urueta-Cuellar, Luz María González-Huerta, Pedro Berrruecos-Villalobos, M.R. Rivera-Vega |
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| Rok vydání: | 2014 |
| Předmět: |
Adult
Male Heterozygote Adolescent Hearing loss Hearing Loss Sensorineural Gene mutation medicine.disease_cause Connexins Young Adult Gene Frequency Genotype Connexin 30 otorhinolaryngologic diseases medicine Humans Allele Child Mexico Genetics Mutation biology Genetic heterogeneity business.industry Homozygote Infant Newborn Infant Sequence Analysis DNA General Medicine medicine.disease Connexin 26 Otorhinolaryngology Child Preschool Pediatrics Perinatology and Child Health biology.protein Female Sensorineural hearing loss medicine.symptom business GJB6 |
| Zdroj: | International Journal of Pediatric Otorhinolaryngology. 78:1057-1060 |
| ISSN: | 0165-5876 |
| DOI: | 10.1016/j.ijporl.2014.04.002 |
| Popis: | Background Hereditary sensorineural hearing loss (SNHL) is a genetically heterogeneous disorder worldwide. Mutations in the GJB2 gene are a frequent cause of hereditary SNHL. There is a prevalence of certain mutations in various populations which suggests that specific mutations may be influenced by ethnic background. Objective To analyze the prevalence of GJB2 , GJB6 mutations in several geographic areas of Mexico in patients with hereditary SNHL. Materials and methods One hundred and forty Mexican unrelated propositi with prelingual SNHL were included in the study. All patients had three previous generations born in Mexico and belonged to no specific ethnic group. Analyses of the GJB2 and GJB6 genes and mt.1555A Results Twenty-three homozygous mutations, 57 heterozygous mutations, 1 double heterozygous ( GJB2 / GJB6 ) and 59 wild-type genotypes in the GJB2 gene were observed. Three patients had the homozygous c.del35 mutation whereas 26 patients were heterozygous for this gene defect. Only one patient with the GJB6 gene deletion was present (it includes the double heterozygous GJB2 / GJB6 ). The mt.1555A > G mutation was not detected. Conclusion We found a great variety of mutations depending on the analyzed region in patients with SNHL; 57.86% of patients had affection in one or two alleles in GJB2 or GJB6 genes whereas 42.14% were wild-type. In some cases, allele distribution depended on region. Molecular studies of more genes involved in hereditary non-syndromic SNHL are required to completely confirm the molecular basis of hearing loss in Mexican population. |
| Databáze: | OpenAIRE |
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