title: Venous thrombosis in relation to fibrinogen and factor VII genes among African-Americans.
abstract: We evaluated the relation between venous thrombosis and plasma fibrinogen levels, the HaeIII and BcI polymorphisms of the beta fibrinogen gene, and the MspI polymorphisms of the factor VII gene in a case-control study of African-Americans. The study included 91 venous thrombosis cases and 185 control subjects obtained from a hospital in Atlanta, Georgia. High plasma fibrinogen was associated with increased risk of venous thrombosis, but the finding was not statistically significant. There was little association between the HaeIII polymorphisms and the BclI polymorphisms and the risk of venous thrombosis. The prevalence of the M2/M2 genotype of the factor VII gene was higher among cases than controls, but the difference was not statistically significant. The prevalence of the HaeIII H2 allele and the BclI B2 allele of the beta fibrinogen gene, both of which have been associated with slightly higher levels of plasma fibrinogen in most studies, is considerably lower among African-Americans in this study than it is among Whites in the United States and among Northern Europeans. The study is limited by its small size. However, despite this limitation, it supports the belief that increased plasma fibrinogen levels are associated with increased venous thrombosis risk. The study also indicated that the HaeIII and the BclI polymorphisms of the beta fibrinogen gene and the MspI polymorphisms of the factor VII gene are not strong determinants of venous thrombosis.
authors.affiliation: Division of AIDS, STD, and TB Laboratory Research, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Public Health Service, U.S. Department of Health and Human Services, Atlanta, GA 30333, USA. haustin@sph.emory.edu
authors.forename: H
authors.initials: H
authors.lastname: Austin
authors.forename: W C
authors.initials: WC
authors.lastname: Hooper
authors.forename: C
authors.initials: C
authors.lastname: Lally
authors.forename: A
authors.initials: A
authors.lastname: Dilley
authors.forename: D
authors.initials: D
authors.lastname: Ellingsen
authors.forename: C
authors.initials: C
authors.lastname: Wideman
authors.forename: N K
authors.initials: NK
authors.lastname: Wenger
authors.forename: P
authors.initials: P
authors.lastname: Rawlins
authors.forename: V
authors.initials: V
authors.lastname: Silva
authors.forename: B
authors.initials: B
authors.lastname: Evatt
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D044383:Black People / Q000235:genetics*; D016022:Case-Control Studies; D005167:Factor VII / Q000235:genetics*; D005260:Female; D005340:Fibrinogen / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012044:Regression Analysis; D012307:Risk Factors; D014481:United States / Q000453:epidemiology; D020246:Venous Thrombosis / Q000453:epidemiology / Q000235:genetics*; D001741:Black or African American
chemical_list: D005167:Factor VII; D005340:Fibrinogen