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Updated: Jul 29, 2025

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Genome sequencing identifies coding and non-coding variants for non-syndromic hearing loss.

Memoona Ramzan1, Duygu Duman2,3, LeShon Chere Peart Hendricks2

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Summary

Whole exome and genome sequencing identified genetic causes for hearing loss (HL) in 40% of families. Genome sequencing proved effective for detecting variants missed by exome sequencing, improving genetic diagnosis rates for HL.

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Area of Science:

  • Genetics
  • Genomics
  • Audiology

Background:

  • Hearing loss (HL) is a complex genetic condition with over 200 associated genes.
  • Identifying the genetic underpinnings of HL is crucial for diagnosis and potential therapeutic strategies.

Purpose of the Study:

  • To identify the genetic etiology of non-syndromic hearing loss in families from diverse geographic regions.
  • To evaluate the diagnostic utility of exome sequencing (ES) and genome sequencing (GS) for detecting causative variants.

Main Methods:

  • Exome sequencing (ES) was performed on 212 families, and genome sequencing (GS) was used as a primary or secondary tool in 36 families.
  • Variant co-segregation analysis was conducted to confirm causality.
  • Phenotypic data was reviewed to exclude syndromic cases and GJB2-related HL.

Main Results:

  • Genetic variants were identified in 71 out of 212 families using ES, and GS provided diagnoses in 12 additional families (7 primary, 5 secondary).
  • The combined diagnostic yield of ES and GS was 40% (89/226 families).
  • GS successfully identified variants in deep intronic and complex regions, which are often undetectable by ES.

Conclusions:

  • Exome and genome sequencing are powerful tools for diagnosing non-syndromic hearing loss.
  • Genome sequencing offers advantages over exome sequencing for detecting variants in challenging genomic regions, thereby increasing the overall diagnostic rate.