冠心病患者载脂蛋白A5基因-1131T＞C多态性研究

目的研究载脂蛋白A5基因-1131T>C多态性位点各等位基因分布频率及其与冠心病(CHD)的关系。方法应用聚合酶链反应-限制片长多态性(PCR-RFLP),对210名湖北地区健康汉族人及119名CHD患者基因型进行鉴定,同时对研究对象血脂进行检测。结果CHD组稀有等位基因C携带者TG水平明显高于C非携带者(P<0.01),-1131三种基因型在二组中的分布频率存在显著差异(χ2=7.6,P=0.022),CHD组稀有等位基因C的频率明显高于对照组(χ2=4.66,P=0.031)。结论ApoA5-1131C等位基因与CHD患者TG水平及CHD有关。     

2型糖尿病患者载脂蛋白A5基因多态性与血脂异常的关联

应用PCR-RFLP研究载脂蛋白A5基因-1131T→C多态性位点各基因型及等位基因的分布频率及其与2型糖尿病(T2DM)的关系。T2DM组等位基因C携带者(CC TC)TG水平明显高于C非携带者(TT);T2DM组C等位基因的频率明显高于对照组,C等位基因与罹患T2DM有关,可能是湖北汉族人群T2DM的独立危险因子之一。     

贵州汉族老年人群载脂蛋白A5基因多态性与2型糖尿病的相关性

目的探讨载脂蛋白A5(Apo A5)基因-1131TC及56CG基因多态性与贵州汉族老年人群2型糖尿病(T2DM)及体内血脂水平的关系。方法采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)结合琼脂糖凝胶电泳技术检测100例健康人及142例T2DM患者Apo A5-1131TC、56CG基因型,并统计等位基因频率分布情况,同时测定所有对象的血脂、血糖水平。结果 1T2DM组和对照组的Apo A5-1131TC位点基因型频率比较差异显著(P=0.006),等位基因频率比较无差异(P=0.349);2对照组和T2DM组的Apo A5-1131C等位基因(TC+CC)携带者的甘油三酯(TG)均明显高于非C等位基因携带者(TT)(P0.05);3未发现Apo A5基因56CG基因多态性。结论 Apo A5-1131TC基因多态性与贵州汉族老年人群T2DM的发病风险有关,携带C等位基因的人群发病风险更高,且C等位基因与TG水平增高有关;未检测出Apo A5基因56CG基因多态性。     

中国人内源性高甘油三酯血症与载脂蛋白A5基因-1131T>C多态性、S19W多态性的相关性

目的探讨中国人内源性高甘油三酯血症患者载脂蛋白A5基因的-1131T〉C多态性及S19W多态性与血脂水平的关系。方法用聚合酶链反应-限制性片断长度多态性分析，对182名内源性高甘油三酯血症患者和200名血脂正常者的载脂蛋白A5基因启动子上游-1131T〉C单核苷酸多态性、编码区的S19W（c．56C〉G）多态性、空腹血脂及载脂蛋白水平进行分析。结果患者的体质指数、血清总甘油三酯和总胆固醇水平较对照组显著升高，高密度脂蛋白胆固醇水平则显著降低。-1131T／C单核苷酸多态性位点T和C等位基因频率在病例组和对照组分别为52．7％、47．3％和67.0％、33．0％。等位基因频率和基因型频率分布符合Hardy-Weinberg平衡定律。T/C基因多态性等位基因T和C频率在两组问的差异有显著性（P〈0．05）；S19W多态性与内源性高甘油三酯血症发病风险未见明显相关性。结论载脂蛋白A5基因-1131C等位基因与血清甘油三酯的升高相关。     

冠心病患者载脂蛋白A5基因多态性与冠状动脉病变程度的相关性

目的分析冠心病患者载脂蛋白A5基因多态性与冠状动脉病变程度的关系。方法采用聚合酶链反应—限制片长多态性技术分别对260例经冠状动脉造影确诊为冠心病的研究对象载脂蛋白A5基因-1131T>C和c.553G>T多态性位点基因型进行检测;其冠状动脉病变程度由病变支数及Gensini积分表示。结果冠心病患者载脂蛋白A5-1131CC基因型人群和c.553T等位基因携带者血清甘油三酯水平明显高于-1131T等位基因携带者和c.553GG基因型人群(P=0.016和0.008);不同冠状动脉病变支数组间载脂蛋白A5基因型分布和不同基因型间Gensini积分的差异无统计学意义(P>0.05);冠状动脉病变支数和Gensini积分与糖尿病发病率呈显著正相关(r=0.141和0.143,P均<0.05),而与血清高密度脂蛋白胆固醇水平则呈显著负相关(r=-0.129和-0.164,P均<0.05)。结论冠心病患者载脂蛋白A5基因-1131T>C和c.553G>T多态性与其血清甘油三酯水平存在一定的相关性,但与冠状动脉病变程度无关。     

载脂蛋白B基因rs2070665位点多态性与肃南裕固族、汉族人群血脂水平的相关性研究

目的:探讨载脂蛋白B(ApoB)基因单核甘酸多态性rs2070665位点在甘肃裕固族、汉族人群中的分布及其与血脂水平的关系。方法:用高通量飞行质谱基因分型法(MALDI-TOF)分别对甘肃肃南裕固族227人和汉族306人进行ApoB基因rs2070665位点多态性检测和血脂水平检测,分析两者的相关性。结果:1裕固族血脂异常组总胆固醇(TC)和低密度脂蛋白胆固醇(LDL-C)水平明显高于汉族血脂异常组(P0.05)。2汉族TC和CC基因型分布频率明显高于裕固族(P0.01);裕固族血脂异常组TC基因型LDL-C值高于汉族(P0.05),裕固族血脂异常组CC基因型三酰甘油(TG)水平低于汉族(P0.05),裕固族健康对照组TT基因型TG水平明显高于汉族(P0.01);同民族内血脂异常组、健康对照组不同基因型血脂水平比较差异无统计学意义。3汉族T和C等位基因频率分布均高于裕固族(均P0.01);同民族对比,裕固族ApoB基因rs2070665位点C等位基因携带者患血脂异常的风险高于T等位基因携带者(OR:1.778;95%CI:1.136~2.780),汉族无差异。结论:甘肃肃南裕固族人群和汉族人群ApoB基因rs2070665位点基因多态性差异显著,裕固族人群ApoB基因rs2070665位点C等位基因携带者具有血脂异常遗传易感性。     

载脂蛋白C3基因rs5128多态性与不同体质指数冠心病患者血脂水平及冠状动脉狭窄程度的相关性

目的探讨中国汉族人群载脂蛋白C3(ApoC3)基因rs5128多态性与不同体质指数(BMI)冠心病(CHD)患者血脂水平及冠状动脉狭窄程度的相关性。方法根据BMI将312例CHD患者分为正常体重组(205例)和超重/肥胖组(107例)。收集所有患者的生理生化资料和冠状动脉造影数据,采用Gensini评分法评价CHD患者的冠状动脉狭窄程度。提取外周血白细胞DNA并应用聚合酶链反应-限制性片段长度多态性法对ApoC3rs5128多态性分型。结果超重/肥胖组体重、BMI、高血压患病率、甘油三酯(TG)、脂蛋白a、TG/高密度脂蛋白胆固醇(HDLC)、总胆固醇(TC)/HDLC、低密度脂蛋白胆固醇(LDLC)/HDLC和载脂蛋白B100(ApoB100)/载脂蛋白AI(ApoAⅠ)水平高于正常体重组,HDLC和ApoAⅠ水平低于正常体重组(P0.05)。在正常体重组中,G等位基因携带者高血压患病率显著高于CC基因型患者(P0.05);在超重/肥胖组中,G等位基因携带者TG和TG/HDLC水平显著高于CC基因型患者(P0.05)。在正常体重组和超重/肥胖组中,rs5128多态性基因型和等位基因频率在不同冠状动脉狭窄程度亚组中的分布差异无统计学意义(P0.05)。结论在超重/肥胖CHD患者中,rs5128多态性G等位基因与血浆TG和TG/HDLC水平升高显著相关,但与冠状动脉狭窄程度无明显关联。     

卵磷脂胆固醇酰基转移酶基因多态性与动脉粥样硬化性脑梗死的研究

目的探讨卵磷脂胆固醇酰基转移酶(LCAT)基因511C/T多态性在中国汉族人群中的分布及其与动脉粥样硬化性脑梗死(ACI)的关系。方法应用PCR、单链构象多态性技术和DNA测序法检测ACI患者150例(ACI组)和健康体检者122例(对照组)LCAT511C/T多态性。根据基因多态性将ACI组分为2个亚组,511CC组(135例)和511CT组(15例)。结果LCAT第四外显子511位点存在多态现象,此多态位点C/T在ACI组和对照组均符合Hardy-Weinberg平衡定律。ACI组CT基因型频率、T等位基因频率均显著高于对照组(P<0.01)。511CC组HDL-C水平高于511CT组(P<0.05)。结论LCAT第四外显子511C/T多态性可能为中国汉族人群ACI易感因素,T等位基因可能与HDL-C代谢有关。     

汉族人载脂蛋白A5基因-1131T＞C多态性与2型糖尿病合并冠心病的相关性研究

目的 探讨我国北方地区汉族人载脂蛋白A5基因（APOA5）-1131T＞C多态性对血脂的影响及其与2型糖尿病合并冠心病的关系.方法 应用聚合酶链反应限制性片段长度多态性（PCR-RFLP）技术检测了136例健康对照者、163例2型糖尿病患者（DM组）和114例经冠状动脉造影确诊的2型糖尿病合并冠心病患者（DM＋CHD组）APOA5-1131T＞C多态性基因型和等位基因频率分布,同时检测了研究对象的血脂、脂蛋白和载脂蛋白水平.结果 健康对照组APOA5-1131T＞C多态性与血清甘油三酯（TG）水平密切相关,C等位基因携带者TG水平明显高于TT基因型（1.38比0.91 mmol/L,P＜0.001）.2型糖尿病合并冠心病组APOA5-1131C等位基因频率明显高于对照组（38.4%比28.3%,P=0.023）,TT、TC、CC基因型频率在DM＋CHD组和对照组分别为33.9%、55.4%、10.7%和50.4%、42.5%、7.1%,两组间差异具有统计学意义（P＜0.05）.而2型糖尿病组和对照组相比,APOA5-1131T＞C多态性基因型频率和等位基因频率分布均无差异.结论 APOA5-1131T＞C多态性对人群TG水平有极显著影响,C等位基因与2型糖尿病合并冠心病的患病风险有一定关系.     

载脂蛋白A5-1131T>C(rs662799)多态性与中国汉族非心源性缺血性脑卒中的关联研究

目的探讨中国汉族人群中载脂蛋白A5(APOA5)-1131T>C(rs662799)多态性与缺血性脑卒中的关系。方法选择1119例缺血性脑卒中患者和1027例健康居民作为对照,采用Taqman-MGB探针对载脂蛋白A5-1131T>C位点基因多态性进行检测,并通过文献检索,对符合标准的文献进行荟萃分析,全面探讨中国人群中载脂蛋白A5-1131T>C多态性与缺血性脑卒中的关系。结果研究表明载脂蛋白A5-1131T>C单核苷酸多态性不同等位基因频率和基因型在缺血性脑卒中组和正常对照组分布未见显著统计学差异。校正传统危险因素logistic回归分析显示在隐性模型下,APOA5-1131T>C与血栓性脑卒中相关(p=0.036),荟萃分析结果表明APOA5-1131C等位基因与中国汉族人群脑卒中发生的危险性无相关关系(OR=1.18,95%CI=0.90-1.54)。结论在中国人群中,APOA5-1131T>C多态性与缺血性脑卒中无相关性。     

Association between DNA variant sites in the apolipoprotein A5 gene and coronary heart disease in Chinese

The recently discovered apolipoprotein A5 ( APOA5 ) gene has been shown to be important in determining plasma triglyceride levels, a major cardiovascular disease risk factor. We searched for possible associations of the APOA5 gene polymorphisms S19W and -1131T>C with coronary heart disease (CHD) in a Chinese population. A total of 483 Chinese CHD patients and 502 control non-CHD subjects were genotyped by polymerase chain reaction-restriction fragment length polymorphism for these 2 single nucleotide polymorphisms. We found that the minor allele 19W was observed only in CHD patients and not in controls, with allelic frequencies of 0.047 and 0.000, respectively ( P < .000001), and the minor allele -1131C was significantly higher in CHD patients than in controls (0.391 vs 0.299, P < .0001). These results suggest that both the S19W and -1131T>C variations in the APOA5 gene are associated with the CHD and appear to be 2 genetic risk factors for CHD susceptibility in Chinese. Moreover, we found that triglyceride levels were significantly higher in -1131C carriers than in -1131T subjects of the control group and that high-density-lipoprotein cholesterol was decreased in -1131C carriers among CHD patients.     

Interactions of the apolipoprotein A5 gene polymorphisms and alcohol consumption on serum lipid levels

Objectives Apolipoprotein(Apo) A5 gene poly-morphisms and alcohol consumption have been associated with increased serum triglyceride(TG) levels,but little is known about their interactions on serum lipid levels.The present study was undertaken polymorphismsand alcohol consumption on serum lipid levels.Methods A total of 516 unrelated nondrinkers and 514 drinkers aged 15 -89 were randomly selected from our previous stratified randomized cluster samples.Genotyping of the ApoA5was performed by polymerase chain reaction and restriction fragment length polymorphism,and then confirmed by direct sequencing.Interactions of the ApoA5alcohol consumption were assessed by using a cross-product term between genotypes and the aforementioned factor.Results The levels of total cholesterol (TC),TG,high-density lipoprotein cholesterol(HDL-C), ApoA1 and ApoB were higher in drinkers than in nondrinkers (P<0.05-0.001).The genotypic and allelic frequencies of the three single nucleotide polymorphisms(SNPs) were not different between the two groups.The levels of TG in non-drinkers, and TC,TG,low-density lipoprotein cholesterol (LDL-C)and ApoB in drinkers were different among the three -1131T>C genotypes(P<0.05-0.001).The -1131C allele carriers had higher serum TC,TG,LDL-C and ApoB levels than the allele noncarriers.The levels of TG,HDL-C and ApoB in nondrinkers,and TG and HDL-C in drinkers were different between the two c.553G>T genotypes(P<0.05-0.01).The C.553T allele carriers had higher serum TG and ApoB levels,and lower HDL-C levels than the allele noncarriers.Serum lipid levels in nondrinkers were not different among the three c.457G>A genotypes(P<0.05 for all), but the levels of HDL-C,LDL-C,ApoA1 and ApoB in drinkers were different between the GG and GA/AA geno-types (P<0.05-0.001).The C.457A allele carriers had lower serum HDL-C,LDL-C,ApoAl and ApoB levels than the allele noncarriers.We also observed four haplotypes:G-G-T, G-G-C,G-A-T,and T-G-C with frequencies ranging from 0.06 to 0.87,representing 100%o     

A single nucleotide polymorphism of the apolipoprotein A-V gene -1131T>C modulates postprandial lipoprotein metabolism

The Apolipoprotein A-V (apoA-V) gene promoter polymorphism -1131T>C modulates triacylglycerol (TG) concentrations. We evaluate whether this polymorphism could be involved in the interindividual variability observed during postprandial lipemia. Fifty-one healthy apo E3E3 male volunteers [12 with -1131CC/CT genotype, and 39 with -1131TT genotype] underwent a Vitamin A fat-load test consisting of 1g of fat/kg body weight and 60,000IU of Vitamin A. Blood samples were taken at time 0 and every hour until the 6th and every 2h and 30 min until the 11th. Cholesterol (Chol) and TG were determined in plasma and Chol, TG, ApoB-100, ApoB-48, and retinyl palmitate (RP) were determined in lipoprotein fractions. Data of postprandial lipemia revealed that subjects with the -1131CT/CC genotype had a higher postprandial response of total plasma TG (p=0.043), large triacylglycerol-rich lipoproteins-TG (TRL-TG) (p=0.002), large TRL-Chol (p=0.004), small TRL-Chol (p=0.004) and small TRL-RP (p=0.001) than subjects with the -1131TT genotype. The modifications observed in postprandial lipoprotein metabolism in subjects with the apoA-V -1131T>C polymorphism could be involved in the increased fasting plasma TG concentrations previously described in carriers of the C allele.     

Plasma apoAV levels are markedly elevated in severe hypertriglyceridemia and positively correlated with the APOA5 S19W polymorphism

OBJECTIVE: The recently discovered apoAV is hypothesized to affect triglyceride metabolism by stimulating the lipolysis of triglycerides in VLDL and chylomicrons. We set out to determine the association between increased serum TG levels, plasma apoAV levels, and polymorphism of the APOA5 gene, with specific emphasis on the APOA5 S19W variation. This mutation alters the endoplasmic reticulum signal peptide and is hypothesized to impair apoAV secretion into the circulation. METHODS AND RESULTS: Two haplotype-tagging APOA5 polymorphisms, APOA5 S19W and APOA5 -1131T>C and plasma apoAV levels were determined in a population of patients with severe hypertriglyceridemia (HTG). As compared to a random control population, the allele frequencies of the APOA5 S19W and -1131T>C rare variants were significantly increased in HTG patients. Furthermore, the HTG population exhibited markedly elevated plasma apoAV levels that were positively correlated with serum TG levels. Plasma apoAV levels were positively correlated with occurrence of the APOA5 S19W rare variant. CONCLUSIONS: The increased allele frequencies of the APOA5 S19W and -1131T>C rare variants in the HTG population are in agreement with previous reports. Our data show a positive correlation between apoAV and TG levels. Moreover the finding of a positive association between apoAV levels and the APOA5 S19W rare variant is in disagreement with the hypothesis that this variant is poorly secreted.     

Polymorphism in the promoter region of the apolipoprotein A5 gene is associated with an increased susceptibility for coronary artery disease

Although triglycerides (TG) are a major risk factor for coronary artery disease (CAD), their exact role is still controversial. Recently, a T/C polymorphism in the promoter region of the apoA5 gene at position 1131 has been found that is associated with an increased plasma TG concentration. We investigated the role of this polymorphism in 308 Hungarian patients with CAD referred to coronary bypass surgery, and in 310 controls recruited from the same area. The prevalence of the apoA5-1131C allele was significantly higher among CAD patients than among controls (10.9% versus 5.7%; P < 0.001, Odds ratio (OR) = 1.99 (1.30-3.04)). Controls carrying the rare C allele had in average 23.0% (P < 0.001), subjects with CAD 13.8% (P < 0.001) higher TG levels compared to common allele homozygotes. The polymorphism was not associated with other conventional CAD risk factors or laboratory data of the patients. In logistic regression models adjusted for age, gender, presence of diabetes, BMI, smoking, LDL-C, HDL-C and hypertension a significantly increased risk of developing CAD was found in patients carrying the apoA5-1131C allele (P < 0.001; OR = 1.98 (1.14-3.48)), suggesting that this allele variant is an independent genetic risk factor for CAD.     

神经突起生长抑制因子A基因多态性与缺血性脑卒中患者遗传易感性的研究

目的探讨神经突起生长抑制因子A(Nogo-A)基因单核苷酸多态性各等位基因及基因型在缺血性脑卒中(IS)患者中的分布频率,并初步分析其基因型与IS的关系及其对血脂、脂蛋白水平的影响。方法采用PCR技术和DNA测序法检测202例IS患者(IS组)及199例对照者(对照组)的Nogo-A基因内含子区rs1012603C/T、rs12464595C/T及rs2864052G/A多态性,分析各基因型及等位基因的分布频率;同时测定血脂、载脂蛋白水平,并进行分析。结果 rs1012603C/T基因型频率和等位基因频率比较,差异有统计学意义(P<0.05),等位基因频率相对风险分析发现,T等位基因携带者患IS的风险是C等位基因的1.513倍(OR=1.513,95%CI:1.069².141);与对照组比较,IS组TG、LDL-C、载脂蛋白A明显升高(P<0.05)。结论 Nogo-A基因内含子区rs1012603C/T多态性与IS的发生有关,T等位基因可能是IS患者发病的遗传易感基因。     

The -1131T>C polymorphism in the apolipoprotein A5 gene is related to hypertriglyceridemia in Taiwanese aborigines

The prevalence of hypertriglyceridemia, considered to be an independent risk factor for the development of cardiovascular disease, is high in Taiwanese aborigines. This study was undertaken to examine the effect of the -1131T>C polymorphism in the apolipoprotein A5 gene on serum triglyceride levels in female Taiwanese aborigines. This was a cross-sectional study, and a total of 316 unrelated female Taiwanese aborigines were genotyped at the -1131T>C polymorphism in apolipoprotein A5 using the polymerase chain reaction-restriction fragment length polymorphism method. Serum triglyceride > or = 150 mg/dL was defined as the hypertriglyceridemia group and triglyceride < 150 mg/dL was considered to be the control group. The frequency of the minor C allele was significantly higher in the hypertriglyceridemia group (0.53) than in the control group (0.35) (p < 0.001). The frequency of this rare allele was comparable to that in Japanese and Han Chinese, but was higher than that in Caucasians. In a multiple logistic model adjusted for possible confounders, C allele-containing variants were independently associated with greater risks (CT genotype: OR = 3.28, 95% CI = 1.43-7.56; CC genotype: OR = 5.86, 95% CI = 2.15-15.99) of hypertriglyceridemia than the TT genotype (p < 0.01), notably with the CC homozygote exhibiting the greatest risks. The genotype polymorphisms were also associated with serum triglyceride concentrations in a linear fashion (for trend, p < 0.05). Our results indicate that the -1131T>C polymorphism of the Apo A5 gene influences serum triglyceride levels in female Taiwanese aborigines, and that differences exist in the frequency of the C allele among people of various ethnicities.     

A case-control study of apoA5 -1131T-->C polymorphism that examines the role of triglyceride levels in diabetic nephropathy

Patients with diabetic nephropathy (DN) have increased plasma fasting triglyceride (TG) levels, and most prospective studies report that elevated TG precedes DN. TG-rich lipoprotein particles might promote progression of DN. To test the hypothesis that elevated TG levels contribute to the development of DN, one may examine whether a polymorphism strongly associated with TG levels affects DN risk. The apolipoprotein A5 (apoA5) -1131T-->C polymorphism has a large effect on the TG level, and all three genotypes are relatively common in East Asians. Therefore, we sought to examine the association of this polymorphism with DN. We genotyped the apoA5 -1131T-->C polymorphism in a case-control study involving 367 Chinese Type 2 diabetes patients with DN and 382 without DN, as well as 198 subjects without diabetes. Mean fasting TG levels were higher in CC than in TT carriers by 41%, 54%, and 62% in each of the three subject groups, respectively. However, the genotype distributions did not differ between patients with and without nephropathy (P=.69). Therefore, these results weigh against the hypothesis that high fasting TG per se causes DN. The strong association between TG level and DN may be due to a factor that is usually closely linked to TG level but that is not affected by the apoA5 polymorphism.