Frequency of mtDNA A1555G and A7445G mutations among children with prelingual deafness in Turkey

Considerable differences on the frequencies of the mitochondrial 12S rRNA A1555G and tRNA(Ser(UCN)) A7445G mutations have been reported in different populations. Our screening of 168 patients coming from independent Turkish families with prelingual sensorineural non-syndromic deafness revealed three deaf children with A1555G (1.8%) but no examples of A7445G. One proband with the mitochondrial A1555G mutation has also evidence for right parietal infarct on a brain imaging study, for which common thrombotic mutations were found to be negative.

CONCLUSION

This study shows that the mitochondrial A1555G mutation is among the significant causes of prelingual non-syndromic deafness in the Turkish population.

Frequency of FV 1299 His-Arg (A4070G) in Turkish Cypriots

FV 1299 His-Arg polymorphism was recently determined to be common in Turkish population (8.5%). This polymorphism contribute to the activated protein C resistance phenotype. We aimed to examine the frequency of this polymorphism in Turkish Cypriots.

Multiple Cerebral Emboli in a Homozygous b-Thalassaemia Patient Due to Factor V 1299 (His-Arg) 4070 A-G Mutation

Thromboembolic episodes are quite rare in beta thalassemia major patients although there is a tendency for thrombosis in haemolytic anaemias. We report a patient with cerebral thromboembolic episode triggered by a minor blood group incompatibility in which the underlying defect of factor V 1299 (His-Arg) was detected three years after his death.