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GJB2 gene mutations causing familial hereditary deafness in Turkey
Yildirim A Bayazit1, Benjamin B Cable, Osman Cataloluk
1Department of Otolaryngology, Faculty of Medicine, University of Gaziantep, Turkey. bayazity@yahoo.com
International Journal of Pediatric Otorhinolaryngology
|December 4, 2003
Summary
Connexin 26 (Cx26) mutations are linked to hereditary hearing loss. This study found GJB2 mutations in 21.4% of Turkish families, but only 14.3% had homozygous mutations causing DFNB1 deafness.
Area of Science:
- Genetics
- Otolaryngology
- Molecular Biology
Background:
- Autosomal non-syndromic hereditary hearing loss is often caused by Connexin 26 (Cx26) mutations.
- Understanding the genetic basis of hereditary deafness in specific populations is crucial for diagnosis and counseling.
Purpose of the Study:
- To investigate the prevalence and significance of Cx26 (GJB2) mutations in Turkish families with hereditary deafness.
- To identify specific GJB2 mutations and their correlation with DFNB1 deafness in the studied cohort.
Main Methods:
- Single-stranded conformational polymorphism (SSCP) analysis was performed on affected individuals from 14 families.
- The entire GJB2 coding region was amplified by PCR and sequenced.
- Analysis included testing for specific GJB2 mutations and a 432 kb upstream deletion.
Main Results:
- GJB2 mutations were identified in Exon 2 of three probands: 35delG, 299-300delAT, and 487G > A (M163V).
- GJB2 mutations were found in 21.4% of families, with 14.3% diagnosed with DFNB1 deafness due to homozygous mutations.
- No mutations were found in Exon 1 or the tested upstream deletion.
Conclusions:
- While GJB2 mutations are present in Turkish families with hereditary deafness, their contribution to DFNB1 is limited to a subset of cases.
- Further research is needed to explore other genetic factors contributing to familial deafness in this population.