ORIGINAL ARTICLESMolecular genotyping of hemophilia A in Saudi Arabia: report of 2 novel mutationsOwaidah, Tarek Ma; Alkhail, Hala Abaa; Zahrani, Hazzaa Alb; Musa, Abdulrahaman Alc; Saleh, Mahasen Alc; Riash, Mahmoud Abuc; Alodaib, Alid; Amero, Khalid AbudAuthor Information aDepartments of Pathology and Laboratory Medicine, Kingdom of Saudi Arabia bKing Faisal Cancer Center, Kingdom of Saudi Arabia cDepartment of Pediatric Hematology/Oncology, Kingdom of Saudi Arabia dDepartment of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Kingdom of Saudi Arabia Received 24 December, 2008 Revised 30 January, 2009 Accepted 1 February, 2009 Correspondences to Tarek M. Owaidah, MD, FRCPA, Head, Diagnostic Hematology Section, Consultant Hematologist, Department of Pathology and Laboratory Medicine (MBC 10), King Faisal Specialist Hospital and Research Centre, P.O. Box 3354, Riyadh 11211, Kingdom of Saudi Arabia Tel: +966 1 4424328; fax: +966 1 4424280; e-mail: firstname.lastname@example.org Blood Coagulation & Fibrinolysis: September 2009 - Volume 20 - Issue 6 - p 415-418 doi: 10.1097/MBC.0b013e328329e456 Buy Metrics Abstract Different types of mutations have been reported in patients with hemophilia A. Although about half of all severe factor VIII deficiencies are caused by gene rearrangements (inversions) involving intron 22 in F8, other mutations such as point mutation, large deletions and insertions had been reported. We report the result of the first molecular testing for or F8 mutations from Saudi Arabia. A cohort of 22 men with hemophilia A was studied for F8 mutations. All patients were tested for factor VIII coagulant activity and inhibitors. Peripheral blood samples were used for DNA extraction followed by PCR detection of intron 22 inversion and all samples tested negative were screened for other F8 mutations. The patient's age ranged between 4 and 37 years. All patients except two siblings had severe hemophilia A. Only two patients out of 22 developed inhibitors with no obvious relation to the genotype. F8 Intron 22 inversion was detected in 10 patients (50%) of severe cases. Additionally, five point mutations and one deletion/insertion involving different exons were detected. All identified mutations were associated with severe phenotype except for one, which was associated with mild phenotype of hemophilia. This is the first report of molecular genotype of hemophilia A in the Saudi population and one of the few for Arab population. We had confirmed the incidence of Inversion 22 in severe hemophilia. We are reporting two novel mutations in F8, which can be used for carrier detection and prenatal genetic diagnosis (PGD). © 2009 Lippincott Williams & Wilkins, Inc.