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Factor V Leiden (rs6025 or F5 p.R506Q [1]) ... the presence of one copy of the factor V Leiden mutation increases that risk to between 3 in 1,000 to 8 in 1,000.
The most common one of these, factor V Leiden, is due to the replacement of an arginine residue with glutamine at amino acid position 506 (R506Q). All prothrombotic factor V mutations (factor V Leiden, factor V Cambridge, factor V Hong Kong) make it resistant to cleavage by activated protein C ("APC resistance").
The best known and most common hereditary form is Factor V Leiden, which is responsible for more than 95% of cases. [5] Other genetic causes include Factor V Cambridge (VThr306) and the factor V HR2 haplotype (A4070G mutation). [5] [6] Acquired forms of APC resistance occur in the presence of elevated Factor VIII concentrations.
Factor V Leiden is an inherited blood clotting disorder. It can cause life-threatening clots in the body and complications during pregnancy.
A point mutation in the gene encoding factor V can lead to a hypercoagulability disorder called factor V Leiden. In factor V Leiden, a G1691A nucleotide replacement results in an R506Q amino acid mutation. Factor V Leiden increases the risk of venous thrombosis by two known mechanisms. First, activated protein C normally inactivates factor Va ...
There, Arg 506 is replaced with Gln, producing Factor V Leiden. This mutation is also called a R506Q. [16]: 2382 The mutation leading to the loss of this cleavage site actually stops APC from effectively inactivating both Factor V a and Factor VIII a. Thus, the person's blood clots too readily, and he is perpetually at an increased risk for ...
In those who are referred for thrombophilia testing, 30–50% have the defect. The prothrombin mutation occurs at rates of 1–4% in the general population, 5–10% of people with thrombosis, and 15% of people referred for thrombophilia testing. Like factor V Leiden, this abnormality is uncommon in Africans and Asians. [14]
[1] [5] This ratio is inversely related to the degree of APC resistance. [7] The ETP-based APC resistance test involves the addition of APC to a thrombin generation assay (TGA). [5] This results in an inhibition of thrombin generation as measured by reduction of the endogenous thrombin potential (ETP; area under the thrombin generation curve). [5]