OBJECTIVES: We investigated mitochondrial DNA 12S rRNA (MTRNR1) gene mutations as a cause of hearing loss in probands with or without a history of aminoglycoside use. PATIENTS AND METHODS: The study included 70 patients (40 females, 30 males; age range 3 to 42 years) with nonsyndromic sensorineural hearing loss. Eleven probands had a history of aminoglycoside use before the onset of hearing loss. All cases were first screened and found to be negative for the GJB2 (connexin 26) gene mutations. The m.1555A>G mutation was screened using the PCR-RFLP technique. The entire 12S rRNA gene was later screened with the PCR-TTGE technique followed by direct sequencing. RESULTS: Of 11 patients with a history of aminoglycoside use, one patient was found to have the m.1555A>G mutation. Two probands with no history of aminoglycoside use exhibited the m.750A>G polymorphism. No pathogenic base substitutions were detected in the remaining patients. CONCLUSION: Apart from the common aminoglycoside ototoxicity-related DNA change, m.1555A>G, we could not identify a common mitochondrial 12S rRNA mutation associated with hearing loss in Turkey. Screening of larger series may document rare alterations.
|Number of pages||6|
|Journal||Kulak burun boǧaz ihtisas dergisi : KBB = Journal of ear, nose, and throat|
|State||Published - 2007|
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