Relation of three genetic traits to venous thrombosis in an African-American population

American Journal of Epidemiology
A DilleyB Evatt

Abstract

A mutation in the Factor V gene (Factor V Leiden), a variant in the 5,10-methylenetetrahydrofolate reductase gene (MTHFR), and an insertion/deletion polymorphism of the angiotensin I-converting enzyme gene (ACE) may be related to abnormal blood clotting. The authors examined the associations between these genetic traits and venous thrombosis among African Americans. This study comprised 93 patients with venous thrombosis and 185 control subjects attending clinics at an urban, public hospital in Atlanta, Georgia, in 1995-1996. Subjects' DNA was extracted from blood and assayed for these genetic traits. Odds ratios were obtained from logistic regression and used as a measure of association between each genetic trait and venous thrombosis. Factor V Leiden was unrelated to venous thrombosis, but the mutation ws too rare among our African-American subjects to evaluate adequately its relation to venous thrombosis. The homozygous and heterozygous genotypes for the V allele of the MTHFR gene were unrelated to venous thrombosis (odds ratio = 0.9, 95% confidence interval 0.5-1.8). Subjects with the deletion/deletion ACE polymorphism experienced a moderate increase in venous thrombosis risk compared with persons with the other genotypes (...Continue Reading

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