GJB2 and GJB6 screening in Tunisian patients with autosomal recessive deafness

Abstract Autosomal recessive nonsyndromic deafness (ARNSD or DFNB) is a very common genetically heterogenous disorder. Although DFNB1 mutations are known to be the most frequent cause of this disorder, they are largely dependent on ethnic groups. The aims of our study are to specify the prevalence a...

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Published in:	International journal of pediatric otorhinolaryngology Vol. 77; no. 5; pp. 714 - 716
Main Authors:	Trabelsi, Mediha, Bahri, Wafa, Habibi, Marwene, Zainine, Rim, Maazoul, Faouzi, Ghazi, Besbes, Chaabouni, Habiba, Mrad, Ridha
Format:	Journal Article
Language:	English
Published:	Ireland Elsevier Ireland Ltd 01-05-2013
Subjects:	Adolescent Adult Child Child, Preschool Connexin 26 Connexin 30 Connexins - genetics Deafness - genetics Female Genes, Recessive Genetic Testing GJB2 GJB6 Hearing loss Hearing Loss, Sensorineural - genetics Humans Male Mass Screening Mutation Otolaryngology Pediatrics Polymerase Chain Reaction Prevalence Sequence Analysis, DNA Tunisia Tunisian patients Young Adult Tunisian patients GJB2 GJB6 Hearing loss
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Summary:	Abstract Autosomal recessive nonsyndromic deafness (ARNSD or DFNB) is a very common genetically heterogenous disorder. Although DFNB1 mutations are known to be the most frequent cause of this disorder, they are largely dependent on ethnic groups. The aims of our study are to specify the prevalence and the spectrum of GJB2 mutations as well as the prevalence of GJB6 large deletion in Tunisian population. Patients and methods 95 unrelated patients with moderate to severe sensorineural hearing loss have been tested. The GJB2 coding region has been studied by PCR/Sequencing and the del( GJB6 -D13S1830) mutation has been screened by fluorescent PCR multiplex. Results 27.36% of patients present mutations on both alleles of GJB2 gene and no one has the del( GJB6 -D13S1830) mutation. The c.35delG mutation represents 86.5% of GJB2 deafness alleles and is found in homozygous state in 22 patients and in heterozygous state in one patient. Four other mutations are detected in four probands: two are compound heterozygous for the p.V37I/p.E47X and the c.35delG/p.R184P mutations, and two are homozygous for the p.E47X and the c.333-334delAA mutations. Conclusion Our results showed that c.35delG is the most common but not the only GJB2 mutation and that the del( GJB6 -del D13S1830) is absent in our cohort. Consequently, we propose a systematic sequencing of GJB2 coding region for ARNSD Tunisian patients and we suggest additional studies to specify the real prevalence of del( GJB6 -D13S1830) in our population.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0165-5876 1872-8464
DOI:	10.1016/j.ijporl.2013.01.024