GJB2 MUTATIONS IN NON SYNDROMIC HEARING LOSS IN THE REPUBLIC OF MACEDONIA
Sukarova Stefanovska E1, Momirovska, A2,3, Cakar M4, Efremov GD1,*
*Corresponding Author: Georgi D. Efremov, Research Center for Genetic Engineering and Biotechnology, Macedonian Academy of Sciences and Arts, Blv. Krste Misirkov 2, 1000 Skopje, R. Macedonia; Tel.: +389-2-32-35-411; fax: +389-2-31-15-434; E-mail: gde@manu.edu.mk
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Abstract

Hearing impairment is a common sensori-neural disorder with the incidence of profound deafness in one per 1,000 births. Non syndromic recessive deaf­ness (NSHL), accounts for approximately 80% of cases of hereditary deafness. It is extremely hetero­geneous genetically with over 130 gene loci. Muta­tions in the GJB2 and GJB6 genes for DFNB1 locus (13q12) are responsible for about half of all cases of autosomal recessive prelingual hearing loss.

We determined the prevalence and mutations in the GJB2 gene, and the presence of delD13S1830 in the GJB6 gene in DNA samples from 33 unrelated Macedonian families with recesive NSHL and 200 normal hearing individuals using single-strand con­formation polymorphism (SSCP) analysis followed by direct sequencing and specific polymerase chain reaction (PCR).

We found mutations in the GJB2 gene in 12 pa­tients, but no delD13S1830 in the GJB6 gene. In 22 chromosomes, 15 (68.2%) had the 35delG mutation, four (6.1%) W24X, two (3.0%) V37I and one (1.5%) R127H.

Because of the high mutation rate (36.4%) in the GJB2 gene in NSHL patients, testing should be per­formed in all cases with prelingual deafness.

Key words: Deafness, Non syndromic hearing loss (NSHL), GJB2 Gene, Connexin 26, Mutations, 35delG

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 Research Center for Genetic Engineering and Bio­technology, Macedonian Academy of Sciences and Arts, Skopje, Republic of Macedonia Adrialab-Synlab, Polyclinic for Laboratory Medi­cine, Skopje, Republic of Macedonia Association of Deaf and Hard of Hearing, Skopje, Republic of Macedonia

Audiology center, Otorhinolaryngology Clinic, Sko­pje, Republic of Macedonia mutated




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