Intron 1 inversion mutation among Turkish hemophilia A patients.

Hemophilia A is an X-linked bleeding disorder resulting mostly from heterogeneous point mutations in the factor VIII (F8) gene. Small/large gene deletions, insertions and gross gene rearrangements underlie the molecular pathogenesis of the disease. Two large inversion mutations due to intrachromosomal recombinations between inverted repeats found in intronic sequences and upstream regions of the F8 gene result in severe hemophilia A. The intron 1 inversion mutation is responsible for about 2% of the cases in various populations. Herein, we report the establishment of the long polymerase chain reaction (PCR) intron 1 inversion mutation detection in our laboratory and a similar frequency of 1-2% among Turkish patients.