Short answer · Medically reviewed summary · Last updated: 2026-05-08
Factor V Deficiency (also known as Owren's disease or parahemophilia) is primarily caused by mutations in the F5 gene, which prevent the body from producing sufficient or functional Factor V protein needed for blood clotting. While the hereditary form is a genetic condition, acquired Factor V Deficiency can also occur due to autoimmune responses where the body mistakenly attacks its own clotting factors. What causes Factor V Deficiency? The primary cause of congenital Factor V Deficiency is an autosomal recessive mutation in the F5 gene located on chromosome 1.
Which are the causes of Factor V Deficiency?
Causes of Factor V Deficiency explained: genetic and environmental factors, reviewed against medical sources, plus patient perspectives.
Factor V Deficiency (also known as Owren's disease or parahemophilia) is primarily caused by mutations in the F5 gene, which prevent the body from producing sufficient or functional Factor V protein needed for blood clotting. While the hereditary form is a genetic condition, acquired Factor V Deficiency can also occur due to autoimmune responses where the body mistakenly attacks its own clotting factors.
What causes Factor V Deficiency?
The primary cause of congenital Factor V Deficiency is an autosomal recessive mutation in the F5 gene located on chromosome 1. This gene provides instructions for making the Factor V protein, which acts as a crucial "accelerator" in the blood coagulation cascade. When this protein is missing or defective, the blood cannot form stable clots efficiently, leading to bleeding symptoms. Unlike many other clotting disorders, the severity of Factor V Deficiency symptoms does not always correlate perfectly with the level of Factor V in the blood.
Is Factor V Deficiency hereditary?
Yes, the congenital form follows an autosomal recessive inheritance pattern. This means an individual must inherit two copies of the mutated gene—one from each parent—to manifest the disorder. If a person inherits only one copy, they are typically an asymptomatic carrier. In rare cases, Factor V Deficiency can be acquired later in life, which is distinct from the genetic form.
What are the differences between genetic and acquired forms?
Understanding the etiology requires distinguishing between the two primary pathways of the disease:
- Congenital: Present from birth due to F5 gene mutations; affects both genders equally.
- Acquired: Often triggered by autoimmune conditions, exposure to bovine thrombin (sometimes used in surgical glues), or specific medications that lead the immune system to produce inhibitors against Factor V.
What is current research focusing on?
Researchers are currently investigating gene therapy techniques to potentially correct the F5 gene defect. Additionally, studies are ongoing to better understand why some patients with very low Factor V levels remain asymptomatic, while others with similar levels experience significant bleeding episodes.
Next steps
- Consult a hematologist for specialized coagulation studies.
- Join the Factor V Deficiency community at DiseaseMaps.org to connect with others sharing their experiences.
- Maintain a detailed log of bleeding episodes to share with your medical team.
Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Factor V Deficiency.
- Orphanet: Congenital Factor V deficiency (ORPHA:319).
- OMIM (Online Mendelian Inheritance in Man): Factor V Deficiency (#227400).
- National Hemophilia Foundation: Rare Bleeding Disorders information resources.
