The codon 55 polymorphism in the paraoxonase 1 gene is not associated with the risk of coronary heart disease in Asian Indians and Chinese

Atherosclerosis
D K SangheraM I Kamboh

Abstract

Recently several but not all studies have implicated the codon 192 polymorphism in the paraoxonase 1 (PON1) gene with the risk of coronary heart disease (CHD). These findings suggest that this polymorphism is not functional but rather may be in linkage disequilibrium with a functional mutation in the PON1 or a nearby gene. In this investigation, we have evaluated the role of another common polymorphism in the PON1 gene at codon 55 with the risk of CHD in a biracial sample of Asian Indians and Chinese. We observed a significant inter-racial variability in the allelic distribution as the frequency of the less common allele, codon 55/L, was significantly higher in Indians than Chinese (0.202 versus 0.036; P < 0.0001). However, despite this inter-racial difference the codon 55 polymorphism was neither associated with CHD risk nor with plasma lipoprotein-lipids variation in both racial groups. We also used two site haplotype data (codons 55 and 192) to assess the combined contribution of the two polymorphisms to the risk of CHD. There was a strong linkage disequilibrium between the two polymorphic sites in both racial groups (P < 0.0001). While the haplotype data revealed no association with CHD in Chinese, the frequency of the BL h...Continue Reading

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