Effectiveness of sequencing connexin 26 (GJB2) in cases of familial or sporadic childhood deafness referred for molecular diagnostic testing

Bai Lin Wu*, Neal Lindeman, Va Lip, Albert Adams, R. Stephen Amato, Gerald Cox, Mira Irons, Margaret Kenna, Bruce Korf, Jay Raisen, Orah Platt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

Purpose: Hearing loss is a common congenital disorder that is frequently associated with mutations in the GJB2 gene encoding the connexin 26 protein (Cx26). We sought to evaluate the effectiveness of direct DNA sequencing for detection of Cx26 mutations as a clinical diagnostic test. Methods: We designed a clinical assay using a three-step polymerase chain reaction (PCR)-based DNA sequencing strategy to detect all possible mutations in the open reading frame and flanking sequences of Cx26. The results of the first 324 cases of childhood deafness referred for diagnostic testing were analyzed. Results: A total of 127 of the 324 (39.2%) cases had at least one mutant Cx26 allele (36.1% of sporadic cases, 70% of familial cases). Of these 127 case, 57 (44.8%) were homozygotes or compound heterozygotes. Thirty-four different mutations were identified, including 10 novel mutations, 6 of which (T8M, K15T, R32L, M93I, N206S, and 511-512insAACG) may be pathogenic. We also provide new evidence on the pathogenicity or nonpathogenicity of 12 previously reported mutations, and clarify the confusing nomenclature of the 313-326del14 mutation. Conclusion: A simple and rigorous method for efficient PCR-based sequence analysis of Cx26 is a sensitive clinical assay for evaluating deaf children. Its widespread use is likely to identify additional pathogenic mutations and lead to a better understanding of the clinical significance of previously identified mutations.

Original languageEnglish (US)
Pages (from-to)279-288
Number of pages10
JournalGenetics in Medicine
Volume4
Issue number4
DOIs
StatePublished - Jul 2002
Externally publishedYes

Keywords

  • Congenital hearing loss
  • Connexin 26 (GJB2)
  • Cx26 mutation
  • Deafness
  • Molecular diagnostics

ASJC Scopus subject areas

  • Genetics(clinical)

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