整合素-α2基因多态性与脑梗死发病的关系及其对脂代谢的影响

目的探讨整合素-α2（ITGA2）基因C807T多态性与脑梗死发病的关系及其对脂代谢的影响,研究急性脑梗死的发病机制。方法应用聚合酶链反应—限制性片段长度多态性（PCR-RFLP）方法检测脑梗死组及正常对照组的ITGA2基因型;同时按常规方法测定血浆脂质、脂蛋白水平。结果 ITGA2基因C807T多态性两组比较有统计学差异（P〈0.05）,T等位基因携带者患脑梗死的风险是C等位基因的1.635倍（OR=1.635,95%C：I 1.232－2.171）,携带T等位基因脑梗死患者的血清TC水平明显高于不携带者（P〈0.05）。结论 ITGA2基因C807T多态性与脑梗死发病有相关性,T等位基因可能是其发病的遗传易感基因;携带T等位基因的个体可能通过影响血脂水平而增加脑梗死的发病风险。     

整合素α2基因C807T多态性与脑梗死的相关性研究

目的探讨整合素α2(ITGA2)基因c807T多态性与脑梗死的关系及其对血脂、载脂蛋白水平的影响。方法选择住院的脑梗死患者150例为脑梗死组,另选健康体检者170例为对照组。应用PCR-RFLP方法检测两组ITGA2的基因型;同时按常规方法测定血脂和载脂蛋白水平。结果与对照组比较,脑梗死组患者TC、TG、LDL-C水平明显升高(P<0.05),ITGA2基因C807T多态性在两组人群中的分布差异有统计学意义(P<0.05),T等位基因携带者患脑梗死的风险是C等位基因的1.690倍(OR=1.690.95%CI:1.219～2.341),携带T等位基因的脑梗死个体TC水平明显高于不携带者(P<0.05)。结论 ITGA2基因C807T多态性与脑梗死发病有相关性,其中T等位基因可能是脑梗死的遗传易感基因;ITGA2基因C807T多态性可能通过影响血脂水平而影响脑梗死的发生。     

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。     

血小板膜糖蛋白Ⅰa-807T基因多态性与急性心肌梗死的关系

目的探讨急性心肌梗死(AMI)患者血小板膜糖蛋白(GP)Ⅰ a-807T基因多态性与AMI发病的关系。方法应用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)方法检测160例AMI患者及160例对照组的GPⅠ a-807 T基因型。结果AMI组GPⅠ a-807 T等位基因频率显著高于对照组(χ2=7.334,P<0.05),AMI组TT TC基因型的频率显著高于对照组。结论GPⅠ a-807 T等位基因可能是AMI患者的遗传危险因素。     

CD14的基因型及血清水平与急性心肌梗死的关系

目的 研究CD14基因启动子-159C/T、-260C/T多态性各等位基因及基因型在急性心肌梗死(AMI)患者中的分布频率,初步分析其基因型及血清水平与AMI的相关性.方法 采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术,检测120例AMI患者及130例正常对照组CD14的基因多态性,同时采用酶联免疫吸附试验(ELISA)检测血清CD14水平.结果 AMI组血清CD14水平显著高于对照组(P<0.01),CD14基因-159C/T多态性在AMI组和正常人群中的分布差异无显著性(P>0.05),而CD14基因-260C/T多态性在两组人群中的分布差异存在显著性(P<0.05),等位基因频率的相对风险分析发现,T等位基因携带者患AMI的风险是C等位基因的1.654倍(OR=1.654,95%CI:1.161～2.356),携带T等位基因的AMI患者血清CD14水平显著高于不携带者(P<0.05).结论 CD14基因启动子-260C/T多态性与AMI的发病具有相关性,其中T等位基因可能是AMI发病的遗传易感基因;携带T等位基因的个体可能通过促进CD14的高度表达进而增加了AMI的发病风险.     

CD14基因启动子区多态性与缺血性脑卒中及血脂的相关分析

目的探讨CD14基因启动子-159C/T-、260C/T多态性与缺血性脑卒中的相关性,并对其与血脂、脂蛋白水平的关系进行分析。方法应用PCR-RFLP的方法检测132例缺血性脑卒中患者(缺血性脑卒中组)和145例对照组的CD14基因型;同时按常规方法测定血浆脂质、脂蛋白水平。结果缺血性脑卒中组总胆固醇、甘油三酯、低密度脂蛋白胆固醇水平明显高于对照组(P<0.05),CD14基因-159C/T多态性在两组人群中的分布差异有显著性意义(P<0.05),等位基因频率的相对风险分析发现,C等位基因携带者患缺血性脑卒中的风险是T等位基因的1.556倍(OR=1.556,95%CI:1.108~2.184),携带C等位基因的缺血性脑卒中个体血浆低密度脂蛋白胆固醇水平显著高于不携带者(P<0.05)。结论CD14基因-159C/T多态性与缺血性脑卒中的发病具有相关性,其中C等位基因是缺血性脑卒中的遗传危险因素;CD14基因-159C/T多态性可能通过影响血脂水平而影响缺血性脑卒中的发生。     

PPARδ基因+294T/C多态性与2型糖尿病患者血脂和胰岛功能关系研究

目的 研究2型糖尿病(T2DM)患者和糖耐量正常(NGT)者中PPARδ基因 294T/C多态性与血脂和胰岛功能的关系.方法 选取346例南京地区汉族人群,其中新诊断T2DM患者236名,NGT者110名,用Touch-down PCR检测PPABδ 294T/C基因变异,并检测入选人群的临床指标.结果 T2DM组中携带C等位基因(TC CC)者HOMA-β水平低于TT型(P<0.05);NGT人群中,携带C等位基因(TC CC)者LDL-C/HDL-C比值高于1-r型(P<0.05),Pearson相关分析显示NGT组携带C等位基因与LDL-C、LDL-C/HDL-C水平呈正相关(P<0.05).结论 T2DM患者携带PPARδ 294C等位基因者胰岛素分泌能力下降,在NGT组中PPABδ 294T/C与脂代谢紊乱相关.     

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。     

有冠心病家族史儿童载脂蛋白E基因多态性的研究

目的：探讨有冠心病（CHD）家族史儿童载脂蛋白（apo)E基因多态性的分布及其对血脂、脂蛋白、apo的影响。方法：采用改良的聚合酶链式反应－限制性片段长度多态性方法,分析83例有CHD家族史的儿童和282例无CHD家族史的儿童apoE基因型。结果：与无CHD家族史的儿童比较,有CHD家族史儿童apoε4等位基因频率较高（分别为6．0％、15．7％,P＜0．01）。早发CHD家族史的儿童ε4等位基因频率较非早发及无CHD家族史儿童为高,三组之间的ε4等位基因频率差异有性（分别为18．3％、14．8％、6．0％,P＜0．05。apoE基因多态性对有CHD家族史儿童的血脂水平有影响,ε2、ε3、ε4等位基因携带有的血总胆固醇（TC）、低密度脂蛋白－胆固醇（LDL－C）、脂蛋白（a)、apoB100、apoE浓度有差异（P＜0．05）;与ε3等位基因携带比较,ε4具有较高的血TC、LDL－C、apoB100水平和较低的apoAⅠ、apoE水平;ε2等位基因携带的血TC、LDL－C和脂蛋白（a)水平较低（P＜0．05）。结论有CHD家族史儿童apoE基因多态性其他儿童不同,并对血浆脂蛋白代谢产生明显影响。     

载脂蛋白A5基因-12238T〉C多态性与冠心病及血脂的相关性研究

目的:探讨APOA5基因-12238T>C多态性与高脂血症及冠心病(CAD)的相关性。方法:采用聚合酶联反应-限制性片段长度多态性分析,对195例冠心病患者(CAD组)和181例正常人(正常对照组),检测SNP4(-12238T>C)位点基因多态性,同时测量血脂水平。结果:SNP4的T/C单核苷酸多态位点等位基因T、C频率在CAD组和正常对照组分别为0.431、0.569和0.384、0.616。等位基因频率和基因型频率分布均符合Hardy-Wein-berg平衡定律。等位基因T和C在两组间经Logistic回归分析校正性别、年龄、血清TC、HDL-C、LDL-C、APOA5SNP3位点基因型影响后,两组无统计学意义(P>0.05)。冠心病亚组分析SNP4的TC型较TT和CC型血浆TG、TC水平明显升高(P<0.05),HDL-C、LDL-C水平无显著性差异(P>0.05)。结论:APOA5基因-12238T>C单核苷酸多态性变化与血浆TG、TC升高密切相关,-12238T>C变异通过影响血脂代谢水平增加冠心病的易患性。     

Prothrombotic gene polymorphisms and plasma factors in young north Indian survivors of acute myocardial infarction

The aim of this study was to evaluate the association of prothrombotic gene polymorphisms [factor V Leiden (FVL) 1691GA, factor VII (FVII) 10976GA, FVII HVR4, platelet membrane glycoproteins GP1BA 1018CT, GP1BA VNTR, integrin ITGB3 1565TC, integrin ITGA2 807CT and methylenetetrahydrofolate reductase (MTHFR) 677C/T], plasma factors (fibrinogen and homocysteine) and traditional risk factors with acute myocardial infarction (AMI) in 184 patients ≤ 40 years of age and 350 controls (≤ 40 years) from north India. Multiple logistic-regression analysis showed that hypertension (OR 1.9, 95 % CI 1.1-3.8, p = 0.042), diabetes mellitus (OR 10.5, 95 % CI 2.0-56.7, p = 0.006), smoking (OR 7.1, 95 % CI 3.7-13.6, p < 0.001), low socio-economic status (OR 13.5, 95 % CI 2.3-78.4, p = 0.004), high waist-hip ratio (OR 35.6, 95 % CI 11.1-53.7, p < 0.001) and FVL 1691GA (OR 6.0, 95 % CI 1.2-13.4, p = 0.03) were independent risk predictors of AMI in young. Elevated plasma fibrinogen also showed association with increased AMI risk. ITGA2 807C/T polymorphism showed protection against AMI in univariate analysis only, while GP1BA VNTR-ac (OR 0.4, 95 % CI 0.2-0.9, p = 0.033) showed significant protection even after adjusting for age and sex. Multinominal logistic-regression analysis showed gene-gene (GP1BA 1018C/T with GP1BA VNTR and ITGA2 807C/T with ITGB3 1565T/C polymorphisms) and gene-environment interactions (gene polymorphisms with smoking) operating in the occurrence of AMI in young. In conclusion, the role of inherited predisposition to thrombosis in complex, polygenic and multifactorial disease like AMI is limited to certain genetic factors, in combination with environmental factor like smoking.     

Integrin alpha-2 and beta-3 gene polymorphisms and colorectal cancer risk

Background and aims  Integrins such as α₂β₁, α_IIbβ₃, and α_vβ₃ have been suggested as key players for cancer development and progression. Several polymorphisms affecting these molecules, two in integrin α₂ (ITGA2 807C>T and 1648G>A) and one in β₃ (ITGB3 176T>C), influence their levels, structure, and possibly their function. To analyze the role of ITGA2 and ITGB3 polymorphisms for colorectal cancer risk and clinical presentation, we performed a case–control study. Materials and methods  Four hundred thirty-three colorectal cancer patients and 433 healthy sex- and age-matched control subjects were investigated. ITGA2 and ITGB3 polymorphisms were determined by 5′-nuclease assays. Results/findings  The ITGA2 807C>T polymorphism was associated with reduced colorectal cancer risk. In a codominant model, the odds ratio for each additional 807-T allele for colorectal cancer was 0.77 (95% confidence interval 0.64–0.94; p = 0.011). The ITGA2 1648G> and the ITGB3 176T>C polymorphism were not associated with colorectal cancer. None of the three polymorphisms investigated was associated with tumor size, histological grade, presence of primary lymph node metastases, tumor stage, or age at diagnosis. Interpretation/conclusion  We conclude that the ITGA2 807C>T polymorphism may be associated with reduced colorectal cancer risk. Armin Gerger and Günter Hofmann contributed equally to this work.     

Platelet response to a small molecule inhibitor of α2β1 integrin is associated with ITGA2 C807T dimorphism

High expression of the collagen receptor, α2β1 integrin, on platelets of ITGA2 807T-allele carriers has been identified as a risk factor for thromboembolic conditions, and α2β1 inhibitors are considered to be potential therapeutic agents. In 59 genotyped individuals, we measured α2 expression levels on platelets and analyzed platelet adhesion to collagen under flow conditions. A sulfonamide-type small-molecule inhibitor of α2β1 integrin decreased average platelet adhesion in individuals with the C/T807T genotype but not in those harboring C807C. Thus, genotype can be used to select a human subpopulation that has the highest probability of showing a positive response to α2β1 inhibitors.     

Genetic variations of apolipoprotein A5 gene is associated with the risk of coronary artery disease among Chinese in Taiwan

Recently, a T/C polymorphism of the promoter region of the APOA5 gene at position -1131 and a G/T polymorphism at position 553 were found to be associated with increased levels of plasma triglyceride. Triglyceride plays a role in coronary artery disease (CAD), so this case-control study tested for a possible link between these two APOA5 polymorphisms, their common haplotypes and the risk of CAD. The subjects included 211 CAD patients and 677 unrelated controls. A significantly higher level of triglycerides and a lower level of high-density lipoprotein cholesterol (HDL-C) were noted for carriers with -1131C than for non-carriers (P<0.001 and 0.013, respectively) among controls. Plasma triglyceride levels were significantly higher (P=0.014) in controls with genotypes that contained the c.553T allele than in homozygotes for the G allele. Subjects homozygous for the wild-type haplotype had significantly lower triglyceride levels and higher HDL-C levels than subjects with all other haplotype pairs. The -1131C homozygous carriers and c.553T heterozygous carriers were found more frequently in 211 patients with CAD than in the 317 age/sex-matched controls (P=0.008 and 0.023, respectively) in univariate analysis. The significant association between c.553T allele carriers with CAD remained in multivariate regression analysis (OR, 1.79; CI, 1.07-3.00; P=0.028), after adjustments were made for other risk factors. Notably, haplotype analysis further verified that the APOA5 -1131C and c.553T bi-loci haplotype was significantly overpresented in CAD, as compared to the controls. These results indicate that the variants of APOA5 gene modulate plasma triglyceride and may use them to predict CAD susceptibility in Taiwanese Chinese.     

807 C/T Polymorphism of the glycoprotein Ia gene and pharmacogenetic modulation of platelet response to dual antiplatelet treatment.

Glycoprotein (GP) Ia/IIa is a major platelet-collagen receptor playing a key role in thrombosis following collagen exposure. The 807 C/T polymorphism of the GP Ia gene (ITGA2) has been associated with platelet GP Ia/IIa receptor expression, having T-allele carriers, increased receptor density and thrombotic risk. The aim of the study was to assess the role of the 807 C/T polymorphism on modulating platelet function in patients undergoing coronary stenting receiving a 300 mg clopidogrel loading dose. Platelet aggregation was assessed in 44 patients by light transmittance aggregometry following adenosine diphosphate and collagen stimuli at baseline, and 10 min, 4 h and 24 h after clopidogrel front loading. The T allele was found in 73% of patients. Clopidogrel reduced adenosine diphosphate-induced platelet aggregation (P < 0.01), which was similar in carriers and non-carriers of the T allele throughout the study (P = 0.73). Clopidogrel reduced collagen-induced platelet aggregation only in non-carriers of the T allele (P = 0.03), which resulted in an increase in T allele carriers during the overall study (P = 0.04). In conclusion, the T allele of the GP Ia gene modulates platelet aggregation and clopidogrel antiplatelet effects, suggesting an enhanced reactivity to fibrillar collagens (exposed during coronary stenting) in T allele carriers and might contribute to an increased thrombotic risk in these patients.     

Relationship between polymorphisms G395A in promoter and C1818T in exon 4 of the KLOTHO gene with glucose metabolism and cardiovascular risk factors in Korean women

BACKGROUND: Recently, klotho has been proposed as a link between cardiovascular diseases and premature aging, but the relationship between KLOTHO genes and cardiovascular risk factors, especially glucose metabolism, in humans is unclear. OBJECTIVES: We investigate the relationship between polymorphisms G395A in promoter and C1818T in exon 4 of the KLOTHO gene with glucose metabolism and cardiovascular risk factors in Korean women. MATERIAL AND METHODS: In 251 women (mean age 51.3+/-6.9 yr), body mass index (BMI), waist circumference, blood pressure, fasting plasma glucose, insulin and lipid profiles were measured. The genotyping of polymorphisms G395A in promoter and C1818T in exon 4 of the KLOTHO gene was performed by allelic discrimination using a 5' nuclease polymerase chain reaction assay. RESULTS: Allele frequencies of G395A polymorphism was 0.829 for the G allele and 0.171 for the A allele and allele frequencies of C1818T polymorphism were 0.804 for the C allele and 0.196 for the T allele, both of which were in compliance with Hardy-Weinberg equilibrium and the two polymorphisms were in linkage disequilibrium (D'=0.43, p<0.01). Mean systolic blood pressure was significantly higher in A allele carriers of G395A polymorphism compared with non-carriers, and the significance was persistent even after adjustment for age and BMI. Mean fasting plasma glucose was significantly higher in T allele carriers of C1818T polymorphism compared with non-carriers, and the significance was persistent even after adjustment for age and BMI. Subjects without any minor allele from either single nucleotide polymorphisms (SNP) had significantly lower mean values for systolic, diastolic blood pressure and fasting plasma glucose levels compared with subjects with both minor allele from either SNP. CONCLUSIONS: We observed that KLOTHO G395A polymorphism was associated with blood pressure and KLOTHO C1818T polymorphism was associated with glucose metabolism in Korean women. Further studies are needed to clarify this relationship.     

中国西北地区汉族人群三磷酸腺苷结合盒转运体A1-V771M与血浆高密度脂蛋白胆固醇水平及冠心病的相关性

目的:探讨中国西北地区汉族人群三磷酸腺苷结合盒转运体A1(ABCA1)的V771 M单核苷酸多态性(SNPs)与血浆HDL水平和冠心病(CHD)的关系。方法:采用病例对照研究,选择经选择性冠状动脉造影(CAG)的中国西北地区汉族人群292例,其中CHD患者176例,正常对照组111例,被剔除5例,聚合酶链反应-限制性片段长度多态性法检测ABCA1-V771 M多态性的基因型,计算V771 M各基因型及等位基因频率分布,分别比较V771 M不同基因型组间临床及血脂生化等指标,分析V771 M多态性对HDL-C水平和CHD的影响。结果:中国西北地区汉族人群的ABCA1-V771 M多态性分布符合Hardy-Weinberg平衡规律,V、M等位基因频率分别为33.91%和66.09%。MM型的HDL-C水平明显低于VV加VM型(P<0.01),但其余血脂成分水平与V771 M各基因型均无相关性(P>0.05)。M等位基因在CHD组的分布频率明显高于V等位基因(P<0.05),M等位基因相关的冠状动脉病变程度显著高于V等位基因(P<0.05),ABCA1-V771 M3种基因型的急性心肌梗死发生率差异无统计学意义(P>0.05)。结论:在中国西北地区汉族人群中,ABCA1-V771 M多态性不仅与血浆HDL-C水平明显相关,而且与CHD易感性及冠状动脉病变严重程度明显相关,V771 M的M等位基因具有致冠状动脉粥样硬化和CHD的遗传学功能。