Journal of Lipid Research (Jan 2006)
Apolipoprotein A-V: a potential modulator of plasma triglyceride levels in Turkss⃞
Abstract
The apolipoprotein A-V gene (APOA5) plays an important role in determining plasma triglyceride levels. We studied the effects of APOA5 polymorphisms on plasma triglyceride levels in Turks, a population with low levels of HDL cholesterol and a high prevalence of coronary artery disease. We found 15 polymorphisms, three of which were novel. Seven haplotype-tagging single nucleotide polymorphisms (SNPs) were chosen and genotyped in ∼3,000 subjects. The rare alleles of the −1464T>C, −1131T>C, S19W, and 1259T>C SNPs were significantly associated with increased triglyceride levels (19–86 mg/dl; P C polymorphism had no effect by itself but was a marker for the −1131T>C, S19W, and 1259T>C polymorphisms. The −1131T>C and 1259T>C polymorphisms were in a strong but incomplete linkage disequilibrium and appeared to have independent effects. Thus, the APOA5 −1131T>C, S19W, and 1259T>C rare alleles were associated with significant increases in plasma triglyceride levels. At least one of these alleles was present in ∼40% of the Turks. Similar associations were observed for −1131T>C and S19W in white Americans living in San Francisco, California.