J Genet Med.  2014 Dec;11(2):63-68. 10.5734/JGM.2014.11.2.63.

Carrier frequency of SLC26A4 mutations causing inherited deafness in the Korean population

Affiliations
  • 1Department of Laboratory Medicine, Seoul Medical Science Institute, Seoul Clinical Laboratories, Seoul, Korea. hansungh@scllab.co.kr
  • 2Department of Laboratory Medicine, Kwandong University College of Medicine, Gangneung, Korea.
  • 3Department of Otorhinolaryngology, Soree Ear Clinic, Seoul, Korea.

Abstract

PURPOSE
The mutation of the SLC26A4 gene is the second most common cause of congenital hearing loss after GJB2 mutations. It has been identified as a major cause of autosomal recessive nonsyndromic hearing loss associated with enlarged vestibular aqueduct and Pendred syndrome. Although most studies of SLC26A4 mutations have dealt with hearing-impaired patients, there are a few reports on the frequency of these mutations in the general population. The purpose
of this study was to evaluate the prevalence of SLC26A4 mutations that cause inherited deafness in the general Korean population.
MATERIALS AND METHODS
We obtained blood samples from 144 Korean individuals with normal hearing. The samples were subjected to polymerase chain reaction to amplify the entire coding region of the SLC26A4 gene, followed by direct DNA sequencing.
RESULTS
Sequencing analysis of this gene identified 5 different variants (c.147C>G, c.225G>C, c.1723A>G, c.2168A>G, and c.2283A>G). The pathogenic mutation c.2168A>G (p.H723R) was identified in 1.39% (2/144) of the subjects with normal hearing.
CONCLUSION
These data provide information about carrier frequency for SLC26A4 mutation-associated hearing loss and have important implications for genetic diagnostic testing for inherited deafness in the Korean population.

Keyword

SLC26A4; Hearing loss; Carrier frequency
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