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Tissue-type plasminogen activator (t-PA), a serine protease, activates the conversion of plasminogen to the fibrinolytic protein, plasmin. The t-PA gene, mapped to chromosome 8p12-p11.2, contains 14 exons. An Alu insertion/deletion (I/D) polymorphism in this gene has been associated with an increased risk for myocardial infarction. In the work reported here we sequenced 11 kilobases (kb) of genomic DNA from 50 normal Japanese volunteers (100 alleles), to include all 14 exons of the t-PA gene, flanking intronic sequences, and 6kb of the 5' sequence. These experiments identified eight novel single-nucleotide polymorphisms (SNPs), in addition to the known Alu I/D polymorphism, from which genotypic data we constructed 12 haplotypes in the tested population. Two-way comparisons of SNPs and the Alu polymorphism revealed strong linkage disequilibrium between the Alu site and SNPs at positions 20,209 (chi2 = 92.263) and 27,555 (chi2 = 47.53), and between SNPs at positions 27,849 and 28,902 chi2 = 66.331). A phylogenic tree was constructed to infer a process of genome construction that would reflect the sequence variations we observed. Our results help to explain the lack of agreement among results of various disease-association studies in which a contribution of the human t-PA gene has been suspected but not always confirmed.

journal of human genetics

Linkage disequilibrium and haplotype analysis among eight novel single-nucleotide polymorphisms in the human tissue-type plasminogen activator (t-PA) gene