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[Study of generational risk in deafness inflicted couples using deafness gene microarray technique].

Ping Wang1, Jia Zhao, Shu-yuan Yu

  • 1Department of Otorhinolaryngology Head and Neck Surgery, First Hospital of Jilin University, Changchun 130021, China.

Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi = Chinese Journal of Otorhinolaryngology Head and Neck Surgery
|September 20, 2011
PubMed
Summary

Screening for deafness-related gene mutations using DNA microarray is crucial for deaf families. This genetic testing can help prevent future generations from inheriting hearing loss, especially when couples share mutations.

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Area of Science:

  • Genetics
  • Audiology
  • Molecular Biology

Background:

  • Deafness is a significant heritable condition.
  • Genetic factors are primary causes of non-syndromic sensorineural hearing loss.
  • Early genetic screening in deaf families can inform reproductive decisions.

Purpose of the Study:

  • To evaluate the effectiveness of DNA microarray for screening deafness-related gene mutations in deaf families.
  • To identify common mutations in genes such as GJB2, GJB3, PDS, and mtDNA 12S rRNA.
  • To assess the risk of deafness in offspring based on parental genotypes.

Main Methods:

  • Recruited 52 deaf couples from Changchun.
  • Extracted genomic DNA from blood samples.
  • Utilized DNA microarray to screen for nine hot spot mutations in four common deafness genes (GJB2, GJB3, PDS, mtDNA 12S rRNA).
  • Confirmed results using traditional sequencing methods.
  • Included 50 normal individuals as a control group.

Main Results:

  • Identified GJB2 gene mutations in 30.7% of cases (32/104), with 235delC being the most frequent (59.1%).
  • Detected SLC26A4 gene IVS7-2 A > G mutation in 7/104 cases.
  • Found that 7.6% (4/52) of families had deaf offspring.
  • Determined a 100% risk of deafness if both parents carry the same gene mutation.

Conclusions:

  • Deaf families face a high risk of having children with deafness.
  • DNA microarray screening is a valuable tool for preventing recurrent deafness in families.
  • Genetic counseling and testing are essential for deaf couples planning to have children.