Factor V deficiency.

Area of Science:

• Hematology
• Genetics
• Molecular Biology

Background:

• Congenital factor V (FV) deficiency is a rare bleeding disorder with a prevalence of 1 in 1,000,000 for the homozygous form.
• Patients exhibit mild to severe hemorrhagic symptoms, particularly affecting mucosal tracts, with very low or undetectable plasma FV levels.
• This deficiency is typically caused by homozygous or compound heterozygous mutations in the FV gene (F5).

Purpose of the Study:

• To provide a concise overview of the factor V (FV) protein and gene.
• To review the molecular, clinical, and therapeutic aspects of congenital FV deficiency.
• To highlight the current limitations in replacement therapy for FV deficiency.

Main Methods:

• Review of published literature on factor V (FV) deficiency.
• Analysis of genetic mutations responsible for FV deficiency.
• Summary of clinical manifestations and therapeutic strategies.

Main Results:

• 56 mutations have been identified, with over two-thirds being null mutations affecting FV expression.
• Missense mutations impairing FV secretion also contribute to the deficiency.
• Current replacement therapy is limited to fresh-frozen plasma due to the unavailability of specific FV concentrates.

Conclusions:

• Congenital FV deficiency is a genetic disorder with significant clinical implications.
• Understanding the molecular basis of FV deficiency is crucial for diagnosis and management.
• The lack of specific FV concentrates necessitates further research into alternative therapeutic strategies.