[Genetic study of sensorineural hearing loss]

Area of Science:

• Genetics
• Otolaryngology
• Pediatrics

Context:

• Investigated 639 Moscow families with 696 children diagnosed with sensorineural deafness.
• The study included 40% of all registered pediatric hearing loss cases under 16 in Moscow.
• Focused on monosymptomatic sensorineural deafness to clarify etiological origins.

Purpose:

• To determine the genetic versus exogenous origins of sensorineural deafness in children.
• To analyze the inheritance patterns of sensorineural deafness within families.
• To calculate the incidence and gene frequencies of different types of hereditary hearing loss in Moscow.

Summary:

• Monosymptomatic sensorineural deafness in children is predominantly genetic (62.2%) rather than exogenous (37.8%).
• Genetic factors account for 50.9% of sporadic cases, with 54.2% of affected children born to unaffected parents.
• Autosomal recessive inheritance is most common (80.8%), followed by autosomal dominant (18%) and X-linked recessive (1.2%).

Impact:

• Establishes incidence rates for recessive (1:2000) and dominant (1:10,000) sensorineural deafness in Moscow children.
• Provides crucial data on recessive gene frequency (0.022) and heterozygote frequency (0.043).
• Informs genetic counseling and potential therapeutic strategies for hereditary hearing loss in pediatric populations.