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Rapid multiplex analysis for the factor V Leiden and prothrombin G20210A mutations associated with hereditary thrombophilia.
Connecticut Medicine 1998 September
Thromboembolic episodes are common events and affect approximately one in 1,000 persons annually. Pulmonary embolism alone accounts for 50,000 to 100,000 deaths per year in the United States with > 50% of those being elderly persons. Resistance to activated protein C is the most common inherited disorder associated with hereditary thrombophilia. A missense mutation has been identified in the gene coding for coagulation factor V (codon 506) which renders this procoagulant factor resistant to inactivation by activated protein C resulting in an increased risk for venous thrombosis. Recently, a second polymorphism was identified in the prothrombin gene (factor II) which is also associated with increased risk for venous thrombosis. Because of the high prevalence of these two mutations in the general population as well as in specific patient populations, the ability readily to detect these two mutations must be feasible. In this study, we evaluated 303 patients for the prothrombin mutatin (G20210A) which were previously tested for the factor V mutation using established polymerase chain reaction-mediated restriction fragment length polymorphism assays. In these patients, 30 (9.9%) were found to be heterozygous for the factor V Leiden mutation with no homozygous mutants identified. Twenty individuals (6.6%) were heterozygous for the prothrombin G20210A mutation, and we identified two individuals (0.66%) who were homozygous for the 20210A allele. Of the total 303 individuals screened, two were double heterozygotes for both the factor V Leiden and the prothrombin gene mutations. We also describe a multiplex polymerase chain reaction-mediated restriction fragment length polymorphism assay for detecting both mutations in a single-tube double-enzyme digestion reaction making identification of these two mutations easily achievable.
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