ABCA1 single nucleotide polymorpisms on high-density lipoprotein-cholesterol and overweight:: the DESIR study

The adenosine triphosphate-binding cassette A1 (ABCA1) gene plays a key role in reverse cholesterol transport. Some ABCA1 gene polymorphisms have been associated with high-density lipoprotein-cholesterol (HDL-C) concentrations. The aim of this study was to assess the effect of three polymorphisms, C69T, G378C, and G1051A (R219K), on HDL-C levels and their interaction with BMI in more than 5000 French whites from the D.E.S.I.R. (Data from an Epidemiological Study on the Insulin Resistance syndrome) cohort study. The T allele of the C69T single nucleotide polymorphism (SNP) was associated with higher HDL-C levels in normal-weight men (BMI < 25 kg/m(2)). The C allele of the G378C SNP was associated with lower HDL-C in overweight subjects (BMI >= 25 kg/m(2)). For the G1051A SNP, in the normal-weight group,the minor A allele was significantly associated with higher HDL-C levels. In contrast, in overweight people, the minor allele was associated with lower HDL-C levels. After accounting for multiple testing, empiric p values remained significant for the associations between G378C SNP and HDL-C in the overweight group and between G1051A SNP and HDL-C in the normal-weight group. This study suggests that ABCA1 gene polymorphisms modulate HDL-C concentrations, in interaction with BMI, and, thus, they might influence cardiovascular risk in the general population.