title: Haplotypes of the plasminogen activator gene associated with ischemic stroke.
abstract: Ischemic stroke (IS) is thought to be a multifactorial disorder associated with genetic backgrounds and environmental factors. In the circulating plasma, tissue plasminogen activator (tPA) catalyzes the reaction from plasminogen to plasmin. If there is a functional disability of tPA, induction of thrombosis and infarction disorders can occur. The aim of this study was to perform a haplotype-based case-control study using single nucleotide polymorphisms (SNPs) in the human tPA gene, and to assess the association between the tPA gene and IS. We genotyped 182 IS individuals and 403 controls for five SNPs in the human tPA gene, rs7007329, rs732612, rs8178750, rs2020922, and rs4471024. Using these five SNPs, a haplotype-based case control study was performed. There were seven SNP combinations that exhibited significant differences in the overall distribution between the IS and control groups. Linkage disequilibrium analysis showed that the combination of rs7007329 and rs8178750 was useful in identification of the susceptibility haplotype. The frequency of the G-T haplotype at rs7007329-rs8178750 was significantly higher in the IS group (1.2%) as compared to the control group (0.0%) (p = 0.003). Diplotype analysis also showed a significant association of the diplotype with the G-T haplotype at rs7007329-rs8178750 (OR:11.4, 95%CI:1.32-97.9, p = 0.013). These results suggest that the G-T haplotype at rs7007329-rs8178750 of the tPA gene is a genetic marker for IS, and that tPA or a neighboring gene is a susceptibility gene for IS.
authors.affiliation: Division of Molecular Diagnostics, Advanced Medical Research Center, Nihon University School of Medicine, Tokyo, Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Saito
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Nakayama
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Sato
authors.forename: Akihiko
authors.initials: A
authors.lastname: Morita
authors.forename: Teruyuki
authors.initials: T
authors.lastname: Takahashi
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Soma
authors.forename: Ron
authors.initials: R
authors.lastname: Usami
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D007511:Ischemia / Q000473:pathology*; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D010960:Plasminogen Activators / Q000235:genetics*; D011110:Polymorphism, Genetic; D020641:Polymorphism, Single Nucleotide; D020521:Stroke / Q000473:pathology*; D013927:Thrombosis / Q000473:pathology
chemical_list: D010960:Plasminogen Activators