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[Analysis on correlation between GJB2 mutations and congenital malformations of inner ear]

Youjin Li1, Jun Yang, Tao Yang

  • 1Department of Otolaryngology, Children Medical Center Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200127, China.

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi = Journal of Clinical Otorhinolaryngology Head and Neck Surgery
|November 23, 2013
PubMed

Insights

GJB2 gene mutations are not linked to congenital inner ear malformations in children. However, these mutations are associated with sensorineural hearing loss (SNHL) not caused by such malformations.

Area of Science:

  • Genetics
  • Otolaryngology
  • Pediatrics

Background:

  • Congenital sensorineural hearing loss (SNHL) in children can stem from various causes, including genetic factors.
  • The GJB2 gene, encoding connexin 26, is a known contributor to non-syndromic SNHL.
  • Inner ear malformations represent a distinct group of structural abnormalities associated with hearing impairment.

Purpose of the Study:

  • To investigate the potential association between GJB2 gene mutations and the presence of congenital inner ear malformations in pediatric patients.
  • To differentiate the role of GJB2 mutations in SNHL with and without inner ear malformations.

Main Methods:

  • Genomic DNA was extracted from peripheral blood samples of 77 pediatric patients with congenital inner ear malformations.
  • Direct sequencing was employed to detect GJB2 mutations.
  • Two control groups were utilized: 80 pediatric patients with SNHL but no inner ear malformations, and 100 individuals with normal hearing.

Main Results:

  • GJB2 mutations were identified in 12 patients with inner ear malformations, while 34 exhibited polymorphism.
  • Significant differences in GJB2 genotype distribution were observed between patients with inner ear malformations and the SNHL control group (P < 0.01).
  • No significant difference was found between patients with inner ear malformations and the normal hearing control group (P > 0.05).

Conclusions:

  • GJB2 mutations are not correlated with the development of congenital inner ear malformations.
  • GJB2 mutations are associated with congenital SNHL in cases where inner ear malformations are absent.
Abstract

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