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Recent reports have suggested that polymorphisms in the human paraoxonase(HUMPONA) gene may be a genetic risk factor for coronary artery disease (CAD) in white populations. However, this association has not yet been confirmed in other ethnic populations. We studied 75 Japanese patients with CAD, whose coronary lesions were confirmed by angiography, and 115 Japanese control subjects with no history of CAD and a normal resting electrocardiogram. The assays for genotyping the two polymorphisms in theHUMPONA gene (192 Arg/Gln and55 Leu/Met) were based on changes in restriction enzyme digestion patterns. For codon 192, the frequencies of the Arg-coding allele (B allele) in both patients and control subjects were much higher than those from published results of whites (.26 to .31), and the difference between patients (.74) and control subjects (.59) was statistically significant (P =.002). The patient group had a higher proportion of Arg/Arg(B/B) homozygotes (52.0% vs 32.2%,P =.006). For codon 55, the frequencies of the Leu-coding allele in control subjects and patients were much higher (.91 and .93, respectively) than those published results for whites, but there was no difference between Japanese control subjects and Japanese patients. When subjects with the55 Leu/Leu genotype only were analyzed,192 Arg/Arg homozygotes were still significantly more frequent in the patients than in the control subjects (55.4% vs 37.2%,P =.024), and the frequency of the192 Arg allele was also higher in patients than control subjects (P =.013). Logistic regression analysis including conventional coronary risk factors revealed that192 Arg is an independent risk factor for CAD. Thus, in the Japanese, the association of CAD with the192 Arg variant ofHUMPONA (B-type enzyme) is similar to that reported for whites, although the allele frequencies for192 Arg and55 Leu are much higher in the former than the latter population.

arteriosclerosis, thrombosis, and vascular biology

A <sup>192</sup> Arg Variant of the Human Paraoxonase <i>(HUMPONA)</i> Gene Polymorphism Is Associated With an Increased Risk for Coronary Artery Disease in the Japanese

A 192 Arg Variant of the Human Paraoxonase (HUMPONA) Gene Polymorphism Is Associated With an Increased Risk for Coronary Artery Disease in the Japanese

A ¹⁹² Arg Variant of the Human Paraoxonase (HUMPONA) Gene Polymorphism Is Associated With an Increased Risk for Coronary Artery Disease in the Japanese