A seminested PCR test for simultaneous detection of two common mutations (35delG and 167delT) in the connexin-26 gene.
BACKGROUND
Several mutations described in the connexin-26 gene cause nonsyndromic autosomal recessive deafness (NARD). The prevalence of two frame-shift mutations, known as 35delG and 167delT, was relatively high in patients with NARD from different populations.


RESULTS
A seminested PCR test has been developed for simultaneous detection of two common mutations in the connexin-26 gene. The test is based on PCR amplification of a 285-bp DNA fragment that covers both the 35delG and 167delT mutations. The latter mutation destroys a Pst I site and is easily detected by Pst I digestion of the 285-bp DNA fragment. However, the 35delG mutation does not destroy or create a restriction site. To create a site, we designed a mismatched primer that generated an EcoN I site in an 87-bp DNA fragment, but only if the 35delG mutation was present. The test was validated using five DNA samples previously characterized for the connexin-26 mutations. After validation, we screened 45 unrelated patients with NARD and 280 healthy Omani subjects for the presence or absence of the 35delG and 167delT mutations. Neither mutation was found to be present in patients or control subjects.


CONCLUSIONS
We developed a seminested PCR test for the simultaneous detection of both common mutations in the connexin-26 gene. In our analysis of 45 patients and 280 control subjects, the 35delG and 167delT mutations were absent in both groups.
Biochemistry Department, College of Medicine, Sultan Qaboos University, Sultanate of Oman. mssimsek@omantel.net.om
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M
Simsek
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Al-Wardy
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Al-Khabory
D000072259:Connexin 26; D017630:Connexins / Q000235:genetics*; D003638:Deafness / Q000151:congenital / Q000175:diagnosis / Q000235:genetics; D005808:Genes, Recessive / Q000235:genetics; D006147:Guanine; D006801:Humans; D017354:Point Mutation; D016133:Polymerase Chain Reaction / Q000379:methods*; D015203:Reproducibility of Results; D017384:Sequence Deletion / Q000235:genetics*; D013941:Thymine
D017630:Connexins; D000072259:Connexin 26; D006147:Guanine; D013941:Thymine