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[Clinical picture of hearing defects caused by Cx26 gene mutations]

T G Markova, A V Poliakova, N L Kunel'skaia

    Vestnik Otorinolaringologii
    |May 6, 2008
    PubMed

    Insights

    The 35delG mutation in the Cx26 gene is prevalent in Russian children with congenital hearing loss, affecting over 53%. This genetic factor is linked to early diagnosis and severe, bilateral neurosensory hypoacusis.

    Area of Science:

    • Genetics
    • Otolaryngology
    • Pediatrics

    Background:

    • Congenital and prespeech non-syndromal hypoacusis affects children.
    • The Cx26 gene plays a crucial role in hearing.
    • Understanding genetic mutations is key to diagnosing hearing loss.

    Purpose of the Study:

    • To determine the prevalence of Cx26 gene mutations in Russian children with congenital and prespeech non-syndromal hypoacusis.
    • To analyze the clinical characteristics of hearing loss associated with the 35delG mutation.
    • To investigate the correlation between the 35delG mutation and various clinical factors.

    Main Methods:

    • Screening of children with hypoacusis for Cx26 gene mutations.
    • Genotyping of 197 patients (146 homozygotes, 51 heterozygotes) for the 35delG deletion.
    • Analysis of clinical data including age of diagnosis, hearing loss severity, and family history.

    Main Results:

    • The 35delG mutation in the Cx26 gene was found in 53% of the studied children.
    • Prevalence increased to over 65% in cases with a family history of hearing loss.
    • Homozygotes for the 35delG mutation were often diagnosed before age 1 with severe, bilateral neurosensory hypoacusis (75.7%).
    • Cx26 gene mutations were identified in 50% of cases where hearing loss was attributed to antibiotic use.

    Conclusions:

    • The 35delG mutation is a significant cause of congenital and prespeech non-syndromal hypoacusis in the Russian population.
    • Early diagnosis and severe hearing loss are characteristic of 35delG mutation homozygotes.
    • Genetic screening for Cx26 mutations is important for understanding and managing hearing loss in children, especially when linked to environmental factors like antibiotic exposure.

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