Association of LIPC -250G&gt;A polymorphism and several environmental factors with serum lipid levels in the Guangxi Bai Ku Yao and Han populations

Li Meng,Yin Ruixing,Long Xingjiang,Pan Shangling,Liu Wanying,Yang Dezhai,Zhang Lin,Lin Weixiong,Li Yiyang,Li Kela

doi:10.1186/1476-511x-9-28

Abstract

BackgroundThe association between -250G>A polymorphism in the promoter region of the hepatic lipase gene (LIPC) and plasma high-density lipoprotein cholesterol (HDL-C) concentration is contradictory in diverse ethnics. Bai Ku Yao is an isolated subgroup of the Yao minority in China. This study was designed to detect the association of LIPC -250G>A (rs2070895) polymorphism and several environmental factors with serum lipid levels in the Guangxi Bai Ku Yao and Han populations.MethodsA total of 778 subjects of Bai Ku Yao and 648 participants of Han Chinese aged 15-80 were randomly selected from our previous stratified randomized cluster samples. Genotyping of the LIPC -250G>A was performed by polymerse chain reaction and restriction fragment length polymorphism combined with gel electrophoresis, and then confirmed by direct sequencing.ResultsThe levels of serum total cholesterol (TC), HDL-C, low-density lipoprotein cholesterol (LDL-C) and apolipoprotein (Apo) AI were lower in Bai Ku Yao than in Han (P < 0.01 for all). The frequencies of GG, GA and AA genotypes were 50.0%, 43.3% and 6.7% in Bai Ku Yao, and 35.7%, 50.6% and 13.7% in Han (P < 0.01); respectively. The frequencies of G and A alleles were 71.7% and 28.3% in Bai Ku Yao, and 61.0% and 39.0% in Han (P < 0.01). The levels of HDL-C and the ratio of ApoAI to ApoB in Bai Ku Yao were lower in GG genotype than in GA or AA genotype (P < 0.05-0.01). The levels of TC, HDL-C, LDL-C and ApoB in Han were lower in GG genotype than in GA or AA genotype (P < 0.05-0.01). The levels of HDL-C and the ratio of ApoAI to ApoB in Bai Ku Yao, and the levels of HDL-C, LDL-C and ApoB in Han were correlated with genotype and/or allele (P < 0.05 for all). Serum lipid parameters were also correlated with age, sex, alcohol consumption, cigarette smoking, blood pressure, body weight, and body mass index in both ethnic groups.ConclusionsThe differences in the serum lipid profiles between the two ethnic groups might partly result from different genotypic frequency of LIPC -250G>A or different LIPC-enviromental interactions.

Highlights

Coronary artery disease is the most common cause of morbidity and mortality in the industrialized nations and is of growing concern in developing countries
The levels of systolic blood pressure, pulse pressure, serum total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), ApoAI and the ratio of ApoAI to apolipoprotein B (ApoB) were lower in Bai Ku Yao than in Han (P < 0.01 for all), whereas physical activity, BMI and the percentages of subjects who smoked cigarettes were higher in Bai Ku Yao than in Han (P < 0.01 for each)
The GG genotype is homozygote for the absence of the site, GA genotype is heterozygote for the presence and absence of the site, and AA genotype is homozygote for the presence of the site

Summary

Introduction

Coronary artery disease is the most common cause of morbidity and mortality in the industrialized nations and is of growing concern in developing countries. The -250G>A substitution in the promoter region of the LIPC has been found to be associated with modifications of plasma lipid concentrations [31,32,33,34,35,36,37,38] and the risk of coronary artery disease [39,40] in some studies but not in others [41,42,43,44]. The association between -250G>A polymorphism in the promoter region of the hepatic lipase gene (LIPC) and plasma high-density lipoprotein cholesterol (HDL-C) concentration is contradictory in diverse ethnics. This study was designed to detect the association of LIPC -250G>A (rs2070895) polymorphism and several environmental factors with serum lipid levels in the Guangxi Bai Ku Yao and Han populations

Objectives

Methods

Results

Conclusion