脂蛋白脂酶基因多态性与高脂血症和肥胖的膳食易感性研究

目的:探讨脂蛋白脂酶(1ipoprotein lipase,LPL)基因PvuⅡ位点多态性在人群中的分布及其与血脂、体质指数和膳食因素的关系。方法:用聚合酶链反应和限制性片段长度多态性方法(PCR-RFLP)检测上海156名高脂血症和154名血脂正常的成年人的LPL-PvuⅡ位点多态性,同时对研究对象进行体格检查、膳食调查及血脂谱项目测定。结果:⑴高脂血症组和血脂正常组人群的基因型P+P+、P+P-和P-P-及等位基因P+和P-构成比差异无显著性意义,三种基因型及P+和P-在性别上无显著性差别。⑵P-P-基因型与非P-P-基因型的BMI水平有显著的统计学差异,P+P+型的BMI水平最高,控制相关影响因素后这种相关性仍然存在(P<0.05)。⑶膳食调查结果显示高脂血症人群中不同基因型的总能量、碳水化合物摄入量有差异。结论:LPL基因PvuⅡ位点P+等位基因研究对象的BMI和总能量、碳水化合物摄入量较高,此位点多态性不足以构成高脂血症的遗传危险因素。

THE ASSOCIATION OF LIPOPROTEIN LIPASE GENE POLYMORPHISM WITH HYPERLIPIDEMIA AND DIETARY PREDISPOSITION OF OBESITY

Objective:To explore the genotype distribution of lipoprotein lipase polymorphism at Pvu Ⅱ locus and its possible association with serum lipid levels, body mass index (BMI) and dietary intake. Method:Pvu II polymorphism was determined by PCR-PFLP method in 156 adults with hyperlipidemia and 154 adults with normal serum lipid levels as control in Shanghai. Their physical examinations, dietary investigation and the levels of serum lipid profile, including TG, TC, HDL and LDL were analyzed. Results: ⑴ There was no significant difference in frequencies of genotypes or allele between the hyperlipidemia and the control, and between male and female. ⑵ BMI were significantly different between P-P-and P+P+, P+P-genotype groups. The BMI of subjects with genotype P+P+ had the highest levels. The relationship was significant after adjusting several confounding factors such as age, gender and blood lipid (P<0.05). ⑶ The dietary survey indicated that energy and carbohydrate intake differed among the hyperlipidemia patients with different genotypes. Conclusion:The subjects with P+ had higher BMI level and more energy and carbohydrate intakes. This gene polymorphism at LPL-Pvu Ⅱ locus isn’t genetic risk factor in hyperlipidemia subjects.