• Sarah Azadmehr, Faezeh Rahiminejad, Fatemeh Zafarghandi Motlagh, Mojdeh Jamali, Pardis Ghazizadeh Tehrani, Tina Shirzadeh, Hamideh Bagherian, Morteza Karimipoor, Elham Davoudi-Dehaghani, and Sirous Zeinali.
• Medical Genetics Lab of Dr. Zeinali, Kawsar Human Genetics Research Center, Tehran, Iran.
• Arch Iran Med. 2021 Dec 1; 24 (12): 887-896.

BackgroundHemophilia A (HA) is an X-linked recessive bleeding disorder with a high rate of genetic heterogeneity. The present study was conducted on a large cohort of Iranian HA patients and data obtained from databases.MethodsA total of 622 Iranian HA patients from 329 unrelated families who had been referred to a medical genetics laboratory in Tehran from 2005 to 2019, were enrolled in this retrospective, observational study. Genetic screening of pathogenic variants of the F8 gene was performed using inverse shifting PCR, direct sequencing, and multiplex ligation-dependent amplification (MLPA). Point mutation frequencies in different exons were analyzed for our samples as well as 6031 HA patients whose data were recorded in a database.ResultsA total of 144 different pathogenic or likely pathogenic variants including 29 novel variants were identified. A strategy to decrease costs of genetic testing of HA was suggested based on this finding.ConclusionThis study provides comprehensive information on F8 pathogenic/likely pathogenic variants in Iranian HA patients which improves the spectrum of causative mutations and can be helpful to clinicians and medical geneticists in counseling and molecular diagnosis of HA.© 2021 The Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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