Factor V Leiden and other coagulation factor mutations affecting thrombotic risk

Area of Science:

• Genetics
• Hematology
• Molecular Biology

Background:

• Venous thrombosis is a significant health concern with known genetic risk factors.
• Inherited thrombophilia encompasses several genetic defects affecting blood coagulation.
• Understanding these defects is crucial for diagnosis and management.

Purpose of the Study:

• To outline the primary genetic risk factors for venous thrombosis.
• To differentiate between rare and common genetic causes of inherited thrombophilia.
• To highlight the diagnostic approaches for these genetic defects.

Main Methods:

• Review of established genetic defects associated with venous thrombosis.
• Categorization of defects based on prevalence in thrombophilia families.
• Description of laboratory diagnostic methods, including DNA analysis.

Main Results:

• Three anticoagulant pathway deficiencies (protein C, protein S, antithrombin) account for ~15% of inherited thrombophilia families.
• Factor V Leiden mutation (APC resistance) and prothrombin 20210 A allele are more prevalent, found in ~63% of families.
• Genetic heterogeneity complicates diagnosis for deficiencies, while single mutations allow DNA-based diagnosis for Factor V and prothrombin variants.

Conclusions:

• Factor V Leiden and prothrombin 20210 A mutations are the most common genetic risk factors for venous thrombosis.
• DNA analysis is the preferred diagnostic method for these prevalent mutations due to their single-mutation basis.
• Anticoagulant pathway deficiencies, though rarer, also contribute significantly to inherited thrombophilia risk.