[Non-syndromic hereditary hearing impairment].

Area of Science:

• Genetics
• Otolaryngology
• Molecular Biology

Background:

• Hearing impairment is a common sensorineural disorder.
• Genetic factors contribute to approximately 50% of prelingual hearing impairment.
• Hereditary hearing loss is classified as syndromic or non-syndromic.

Purpose of the Study:

• To review the genetic landscape of non-syndromic hearing impairment.
• To highlight the genetic heterogeneity and complexity of hearing loss.

Main Methods:

• Literature review of identified gene loci and associated disorders.
• Analysis of genetic inheritance patterns (autosomal dominant, recessive, X-linked, mitochondrial).
• Identification of genes encoding proteins involved in auditory function.

Main Results:

• Approximately 120 gene loci for non-syndromic hearing impairment have been identified.
• 54 loci are autosomal dominant, 67 autosomal recessive, 7 X-linked, and 4 mitochondrial.
• Mutations in the GJB2 gene (Connexin-26) account for up to 50% of prelingual recessive non-syndromic deafness.

Conclusions:

• The genetic basis of hearing is highly complex and heterogeneous.
• Understanding specific genes and protein functions is crucial for elucidating hearing mechanisms.
• Continued genetic research is vital for diagnosing and potentially treating hearing impairments.