MTHFR基因和eNOS基因多态性与妊娠高血压综合征发病的相关性研究

目的探讨内皮型一氧化氮合酶（endothelial nitricoxide synthase,eNOS）基因第7外显子G894T突变和N5,N10-亚甲基四氢叶酸还原酶（methyenetetrahydrofolate reductase,MTHFR）基因C677T突变与潍坊地区汉族人妊娠高血压综合征（妊高征）发病的关系。方法应用PCR-RFLP方法,对92例妊高征患者（妊高征组）和89例正常妊娠妇女（对照组）的eNOS基因G894T突变和MTHFR基因C677T突变进行检测。结果妊高征组eNOS基因Glu/Glu、Glu/Asp、Asp/Asp基因型频率分别为71.7%、28.3%、0.0%,MTHFR基因CC、CT、TT基因型频率分别为21.8%、40.2%、38.0%。妊高征患者MTHFR基因TT基因型频率（38.0%）显著高于对照组（18.0%）（P〈0.05）,而CT基因型频率妊高征组（40.2%）显著低于对照组（61.8%）（P〈0.05）,携带TT基因型个体发生妊高征的风险增加2.80倍。eNOS基因型和等位基因频率两组比较差异均无显著性（P〉0.05）。结论MTHFR基因TT基因型能增加妊高征的患病风险,eNOS基因G894T突变与妊高征发病无关。     

新余市汉族女性MTHFR与MTRR基因多态性分布研究

目的针对新余市汉族女性开展分子流行病学调查,研究叶酸代谢关键酶甲硫氨酸合成酶还原酶(MTRR)和5,10-亚甲基四氢叶酸还原酶(MTHFR)的基因多态性分布。方法以孕期保健的521名汉族健康女性为研究对象,采集口腔黏膜上皮脱落细胞,提取基因组DNA,使用荧光定量PCR方法检测MTHFR C677T、A1298C和MTRR A66G基因多态性,进行统计分析。结果 (1)入组对象的基因多态性分布符合遗传平衡。(2)汉族女性MTHFR 677CC、CT、TT的基因型频率分别为38.6%、47.6%、13.8%,C、T等位基因频率分别为62.4%、37.6%;MTHFR 1298AA、AC、CC的基因型频率分别为65.1%、31.9%、3.07%,A、C等位基因频率分别为81.0%、19.0%;MTRR 66AA、AG、GG的基因型频率分别为60.3%、35.1%、4.61%,A、G等位基因频率分别为77.8%、22.2%。(3)汉族女性MTHFR C677T和A1298C两位点连锁有7种组合,频率最高的是CT/AA(30.5%),没有TT/AC和TT/CC组合。两位点间存在完全连锁不平衡(D'=1.0,r~2=0.124)。结论获取新余市汉族女性MTHFR和MTRR基因多态性的群体遗传学特征,其中关键基因位点MTHFR C677T的高风险TT基因型比例为13.8%,低于已报道的山东淄博、河南新乡、辽宁沈阳等地,高于广东佛山市,说明叶酸利用能力中等,对于高风险人群还需加强孕期管理,同时本研究也为当地人群进行个体化增补叶酸提供理论依据。     

eNOS基因和FⅦ基因多态性与冠心病的相关性研究

目的 探讨内皮型一氧化氮合酶(endothelial nitric oxide synthase,eNOS)基因外显子7的Glu298Asp和凝血因子Ⅶ(coagulation factor VH,FVH)基因外显子8的Arg353Gin多态性与汉族人群冠心病(CHD)及老年人CHD发病的关系.方法 选取147例CHD患者和116例正常对照组人群,应用聚合酶链反瘟-限制性片段长度多态性(PCR-RFLP)分析技术检测eNOS基因Glu298Asp和FⅦ基因Arg353G1n多态性.结果 ①eNOS基因Glu/Glu、Glu/Asp、Asp/Asp基因型频率CHD组分别为78.9%、20.4%、0.68%和对照组分别为89.7%、10.3%和0.0%;FⅦ基因型频率CHD组和对照组之间差异无统计学意义(P＞0.05);②Glu/Asp+Asp/Asp型和Asp等位基因频率CHD组(21.1%和10.9%)显著高于对照组(10.3%和5.2%)(P＜0.05),Asp等位基因对≥60岁老年人发生CHD的风险增高,OR=2.43,95%CI:1.22～4.86(P＜0.05);③携带FⅦ基因Arg/Gln+Gln/Gln型和Gin等位基因个体发生CHD的风险降低,OR=0.77,95%CI:0.33～0.56和OR=0.85,95%CI:0.38～0.53(P＞0.05).结论 eNOS基因Asp等位基因可能是汉族老年人CHD发病的遗传易感因素之一;FⅦ基因Arg353Gln多态性与CHD发病无关.     

内皮型一氧化氮合酶基因和凝血因子Ⅶ基因多态性与老年人冠心病的相关性研究

[摘要] 目的 探讨内皮型一氧化氮合酶（endothelial nitric oxide synthase，eNOS）基因外显子7的Glu298Asp和凝血因子Ⅶ（coagulation factor Ⅶ，FⅦ）基因外显子8的R353Q多态性与与汉族人群冠心病（CHD）及老年人CHD发病的关系。方法 选取147例CHD患者和116例正常对照组人群，应用聚合酶链反应-限制性片段长度多态性（PCR-RFLP）分析技术检测eNOS基因Glu298Asp和FⅦ基因R353Q多态性。结果 （1）eNOS基因Glu/Glu、Glu/Asp、Asp/Asp基因型频率CHD组分别为78.9%、20.4%、0.68%和对照组分别为 89.7%、10.3%和0.0%；FⅦ基因型频率CHD组和对照组之间差异无显著性（P>0.05）；（2）Glu/Asp+Asp/Asp型和Asp等位基因频率CHD组(21.1% and 10.9%)显著高于对照组(10.3% and 5.2%)（P<0.05）， Asp等位基因对≥60岁老年人发生CHD的风险增高，OR=2.43，95%CI：1.22～4.86（P<0.05）；（3）携带FⅦ基因RQ+QQ型和Q等位基因个体发生CHD的风险降低，OR=0.77,95%CI:0.33～0.56和OR=0.85,95%CI:0.38～0.53(P>0.05)。结论 eNOS基因Asp等位基因可能是汉族老年人CHD发病的遗传易感因素之一；FVII基因R353Q多态性与CHD发病无关。     

亚甲基四氢叶酸还原酶基因多态性与孕妇子痫前期易感性及新生儿围生结局的关系

目的 研究亚甲基四氢叶酸还原酶(methylenetetrahydrofolate reductase,MTHFR)基因C677T多态性与孕妇子痫前期易感性及新生儿围生结局的关系.方法 选择2013年1月至2014年8月在我院妇产科待产的孕妇120例,其中子痫前期患者组(实验组)和对照组各60例,抽提全血DNA,PCR扩增MTHFR基因片段,经酶切反应后通过凝胶电泳对MTHFR C677T位点的突变进行检测,计算两组孕妇的基因型分布情况,并分析MTHFR基因多态性与孕妇子痫前期的关系,同时跟踪新生儿围生结局并分析其与MTHFR基因突变的关系.结果 实验组与对照组的孕妇MTHFR C677T位点多态性的检查结果分别为野生型纯合子型11.67％与23.33％;杂合子突变型45.00％与61.67％;突变型纯合子43.33％与15.00％;T/T基因型的孕妇发生子痫前期的风险是C/C基因型或T/C基因型孕妇的1.86倍(95％ CI:1.34 ～2.57).不同基因型对应的新生儿平均出生体质量与新生儿评分异常率结果:C/C型的平均出生体质量为3186.2±432.4g,异常新生儿评分率4.76％;C/T型的平均出生体质量为3216.5±512.4g,异常新生儿评分率3.12％;T/T型的平均出生体质量为3078.5±408.6g,异常新生儿评分率5.71％.虽然各组基因型之间的平均出生体质量与异常新生儿评分率结果不同,但差异无统计学意义.结论 MTHFR C677T突变是孕妇发生子痫前期的危险因素之一,但与新生儿围生结局无显著相关.     

MTHFR基因多态性与非综合征性唇腭裂的相关性研究

目的:探讨5,10-亚甲基四氢叶酸还原酶(MTHFR)基因C677T多态性与非综合征性唇腭裂(NSCLP)遗传易感性的相关性。方法:选取2014年6月至2015年5月在我院治疗的NSCLP患者100例(病例组A),其中单纯性腭裂(CPO组)23例,唇裂伴或不伴腭裂(CL/P组)77例;同时选取100名正常儿童(对照组A)、100名生育过NSCLP患儿母亲(病例组B)和100名正常出生儿母亲(对照组B),采用聚合酶联式反应-限制性片段长度多态性基因分型技术检测各组MTHFR基因C677T突变。结果:病例组A中,CL/P组C、T等位基因频率为55.84%和44.16%,CPO组分别为54.35%和45.65%,对照组A分别为75.00%和25.00%,CL/P组和CPO组T等位基因频率明显高于对照组A,差异有统计学意义(P0.05);CT基因型个体患CL/P的风险是CC基因型个体的2.39倍,患CPO的风险是CC基因型个体的2.98倍;TT基因型个体患CL/P的风险是CC基因型个体的6.70倍,患CPO的风险是CC基因型个体的7.33倍;病例组B和对照组B的等位基因频率和基因型构成情况比较差异无统计学意义(P0.05)。结论:MTHFR基因C677T突变可能是NSCLP发生的遗传危险因素之一,但母亲MTHFR基因C677T突变可能与子代发生NSCLP无关。     

MTHFR基因C677T多态性与冠心病患者血浆同型半胱氨酸和叶酸水平相关

目的研究宁夏地区汉族人群5,10-亚甲基四氢叶酸还原酶基因(MTHFR)C677T多态性、同型半胱氨酸水平(Hcy)及叶酸水平与冠心病(CHD)的相关性。方法用病例-对照研究方法、应用限制性片段长度多态性扩增技术(PCR-RFLP)分析宁夏地区汉族202例冠心病患者及199例正常人群MTHFRC677T基因型频率及基因频率的分布特点。荧光偏振免疫分析法测定血浆Hcy水平,化学发光免疫分析法测定血清叶酸、VitB12浓度。结果 (1)病例组与对照组MTHFRC677T基因型频率分别为CC型23.3%vs20.7%、CT型52.3%vs54.5%和TT型24.4%vs24.8%,两组间基因型及等位基因频率分布无差异。(2)冠心病患者组中MTHFR基因C677TCC基因型患者血浆Hcy浓度(10.84μmol/L)较T基因携带者(12.24μmol/L)低(P<0.01)。CC基因型患者血浆叶酸浓度(5.38μg/L)较T基因携带者(3.72μg/L)高(P<0.05)。结论 MTHFRC677T的3种基因型频率在宁夏汉族冠心病患者和正常人群中的分布无统计学意义。MTHFR基因C677T多态性与冠心病的危险因素Hc...     

临沂市汉族女性MTHFR和MZRR基因多态性分布及其与同型半胱氨酸水平的相关性

目的 分析山东省临沂市汉族女性亚甲基四氢叶酸还原酶(methylenetetrahydrofolate reductase,MTHFR)677C/T、1298A/C及甲硫氨酸合成酶还原酶(methionine synthase reductase,MTRR)66A/G基因多态性的分布特征,及其与同型半胱氨酸(homocysteine,Hcy)水平的相关性.方法 采用横断面调查研究方法,以临沂市825名汉族女性为研究对象,采集口腔黏膜上皮细胞,提取基因组DNA,采用Taqman-MGB技术进行MTHFR和MTRR基因多态性检测.统计分析基因多态性的分布特征,并与其他地区(山东省潍坊市、河南省郑州市、四川省德阳市及海南省)的数据进行比较.采用酶转换法检测281名研究对象的血浆Hcy浓度,根据MTHFR基因多态性将其分为MTHFR酶活性基本正常组和显著降低组,分析Hcy水平与MTHFR酶活性的相关性.结果 (1)临沂市汉族女性的MTHFR677CC、CT、TT的基因型频率分别为16.7%、48.3%和35.0%,TT纯合突变高于四川德阳和海南地区(P<0.01).MTHFR 1298AA、AC、CC的基因型频率分别为76.0%、21.6%和2.4%,CC纯合突变基因型频率低于四川德阳和海南地区(P<0.01).MTRR 66AA、AG、GG的基因型频率分别为54.7%、39.4%和5.9%,GG纯合突变基因型频率低于海南地区(P<0.01).(2)MTHFR酶活性显著降低组的Hcy水平高于酶活性基本正常组,差异有统计学意义(P<0.05).结论 (1)临沂市汉族女性有不同于其他地区的MTHFR和M7RR基因多态性分布特征.(2)MTHFR基因多态性导致的酶活性降低是Hcy水平升高的风险因素.     

亚甲基四氢叶酸还原酶基因多态性与青海汉族妊娠期高血压疾病的相关性

目的 探讨亚甲基四氢叶酸还原酶（MTHFR）基因-677C/T（rs1801133）多态性与青海汉族妇女妊娠期高血压疾病（HDP）的相关性。 方法 选择青海省HDP患者 139 例（HDP组）,正常妊娠孕妇 145 例（对照组）,应用限制性内切酶片段长度多态性聚合酶链反应（PCR-RFLP）方法,检测HDP组和对照组MTHFR-677C/T多态性分型并测序验证。 结果 HDP组和对照组MTHFR基因CC、CT、TT基因型频率分别为54.68%、35.25%、10.07% 和69.66%、22.06%、8.28%,CC基因型频率HDP组54.68%低于对照组69.66%（P<0.05）,CT基因型频率HDP组35.25%高于对照组22.06%（P<0.05）,而TT基因型频率HDP组和对照组之间差异无统计学意义（P>0.05）;HDP组和对照组MTHFR-677C/T多态性C和T等位基因频率分布有差异（P<0.05）,HDP组T等位基因频率高于对照组（χ²=5.568,P<0.05）。 结论 MTHFR基因-677C/T多态性与青海汉族HDP相关,MTHFR基因-677C/T多态性中T等位基因可能是HDP的易感基因,CT基因型为HDP的易感基因型。     

重型抑郁症患者亚甲基四氢叶酸还原酶基因多态性检测

目的 探讨北方汉族人群5,10-亚甲基四氢叶酸还原酶基因多态性与重型抑郁症的关系。方法 采用病例-对照研究。聚合酶链反应-限制性片段长度多态性技术检测MTHFR C677T及 A1298C基因多态性。结果 （1）对照组677TT基因型频率及T等位基因频率分别为为13.16％和39.80%;1298CC基因型和C等位基因频率分别为1.32%和12.83％;（2）抑郁症组MTHFR 677TT基因型频率（35.53％）明显高于正常对照组（13.16％）（P＜0.001）,677 T等位基因频率（57.24%）明显高于对照组（39.80%）（P＜0.001）。（3）Ligistic回归分析, C677T基因型与疾病的发生有关（P<0.001）。结论MTHFR C677T基因变异与本组重症抑郁症发病有关,是其发病的危险因素;MTHFR A1298C基因变异与本组重症抑郁症发病无关联。     

Endothelial nitric oxide synthase gene polymorphisms in Fabry's disease

The gene encoding endothelial nitric oxide synthase (eNOS) is involved in abnormalities in nitric oxide (NO) synthesis that mediates functional damage of vascular cells, especially of endothelial cells (ECs), a common characteristic in cardiovascular diseases. In Fabry's disease, the characteristic mutation in the alpha-galactosidase A (alpha-gal A) gene induces large deposits of glycosphingolipids, particularly concentrated in ECs, a process associated with endothelial dysfunction. To determine whether in addition to alpha-gal A gene mutations, eNOS genetic variations are implicated in this process, we examined the genotypes of the missense Glu298Asp (G894T) variant in exon 7 and 27-bp tandem repeats in intron 4 (4b/a) in 19 patients with Fabry's disease, and 39 normal volunteers. The results showed that both varials have a significant association with Fabry's disease. The frequencies of mutant Glu/Asp + Asp/Asp genotypes and Asp allele are significantly higher in Fabry's disease (68.4%, p = 0.044, and 47.4%, p = 0.022, respectively) than in controls (46.7% and 25%, respectively). The frequencies of eNOS 4b/a polymorphisms are also significantly different in Fabry's disease when compared to controls. The mutant 4b/a + 4a/a genotype frequencies are 55.5% (p = 0.032) and 4a allele 27.8% (p = 0.05) compared with controls (23.1% and 12.8%, respectively). These results indicate that more than half of the patients with Fabry's disease carry the Glu298Asp variant ( approximately 68%) and/or the 4b/a polymorphism ( approximately 55%). To the best of our knowledge, this is the first report showing an influence of eNOS gene polymorphisms in patients with Fabry's disease.     

蒙古族冠心病人群与MTHFRC677T等5个相关基因和基因多态性的相关性研究

目的针对内蒙古蒙古族人群的MTHFRC677T、eNOSG894T、ADRBlG1165C、GNB3C825T、ACEI／D、AGTM235T、CYP11B2基因C-344T多态性进行多因素分析,探讨蒙古族人群冠心病人群的遗传易感因素。方法应用PCR—RFLP技术及Sequenom系统检测患者与116名冠心病患者的和156名健康对照组MTHFRC677T、eNOSG894T、ADRB1G1165C、GNB3C825T、ACEI／D、AGTM235T、CYP11B2基因C-344T多态性。结果冠心病组和对照组在年龄、收缩压、舒张压等方面存在统计学差异P〈0．05,eNOS基因G894T位点GT基因型与GG基因型在单因素及多因素分析中均有统计学差异,单因素分析中P值为0．023,多因素分析中P值为0．024,OR=2．405,95％可信区间为1．119～4．807。结论eNOS基因G894T位点GT基因型可能是蒙古族人群患冠心病的易感基因位点。     

Association of endothelial dysfunction with endothelin, nitric oxide and eNOS Glu298Asp gene polymorphism in coronary artery disease

The endothelial dysfunction has been implicated as a major event in the pathogenesis of atherosclerosis. Therefore, this study was planned to determine (a) role of endothelium-derived nitric oxide (NO) and endothelin as coronary artery disease (CAD) risk markers and (b) intergenotypic variation of endothelial nitric oxide synthase (eNOS) Glu298Asp polymorphism in CAD.The endothelin, NO and eNOS genotypes were determined in 60 patients with documented history of CAD. These were compared with 50 age- and sex- matched healthy controls. The genotype frequencies for eNOS gene polymorphism were determined by PCR and RFLP. The plasma endothelin in CAD patients was significantly higher (p< 0.001) whereas, the NO level in CAD group was significantly lower (p< 0.001) than the control group. The genotype frequencies for Glu298/Asp (Glu/Glu and Glu/Asp) genotypes were 75% and 25% in CAD subjects and 88% and 12% in control subjects, respectively. No Asp/Asp was found in any of the groups. The genotype frequencies differed significantly (p< 0.05) between the controls and cases. In conclusion, endothelin and NO may be used as markers of endothelial dysfunction in CAD. Asp allele might be a risk factor for CAD in the North Indian population.     

MTHFR基因C677T多态与神经管缺陷及先兆子痫关系的研究

目的 探讨亚甲基四氢叶酸还原酶（ｍｅｔｈｙｌｅｎｅｔｅｔｒａｈｙｄｒｏｆｏｌａｔｅ ｒｅｄｕｃｔａｓｅ,ＭＴＨＦＲ）基因Ｃ６７７Ｔ多态与神经管缺陷（ｎｅｕｒａｌ ｔｕｂｅ ｄｅｆｅｃｔｓ,ＮＴＤ）及先兆子痫发生的关系。方法 采用ＰＣＲ／ＲＦＬＰ技术对２７位生过ＮＴＤ患儿的母亲和２４位生过正常孩子的母亲,以及５７例患过先兆子痫的妇女和１２０名正常对照妇女进行了ＭＴＨＦＲ等位基因检测。结果 （１）下沉     

PAI-1基因和MTHFR基因多态性与复发性早期自然流产的关系

目的探讨纤溶酶原激活剂抑制物1(plasminogenactivatorinhibitor1,PAI1)基因和亚甲基四氢叶酸还原酶(methylenetetrahydrofolatereductase,MTHFR)基因多态性与复发性早期自然流产(recurrentearlyspontaneousabortion,RESA)的相关性。方法选取127例RESA非妊娠患者和117名健康非妊娠妇女,应用聚合酶链反应限制性片段长度多态性分析技术检测PAI1基因-675位4G/5G多态性和MTHFR基因C677T位点多态性。结果(1)患者组PAI1基因4G/4G基因型频率(45.7%)和4G等位基因频率(66.1%)显著高于对照组(17.1%和46.6%)(P<0.01),与5G/5G基因型比较,4G/4G型患者发生RESA的相对风险率的比数比(oddsratio,OR)为4.8,95%的可信区间(confidenceinterval,CI):2.23～10.35;(2)MTHFR基因T/T基因型和T等位基因频率患者组(43.3%和66.5%)显著高于正常对照组(21.4%和52.6%)(P<0.01),与C/C基因型比较,T/T型患者发生RESA的相对风险率为OR=3.2,95%CI:1.40～7.30;(3)RESA患者若同时兼有4G/4G和T/T基因型时,发生自然流产的相对风险率明显增加,OR=6.20,95%CI:2.62～14.67。结论PAI1基因4G/5G多态性和MTHFR基因C677T位点多态性与不明原因RESA密切相关,易感基因型4G/4G型和T/T型对RESA的发生具有协同作用。     

Promoter polymorphism T-786C, 894G→T at exon 7 of endothelial nitric oxide synthase gene are associated with risk of osteoporosis in Sichuan region male residents

Objective: To investigate the association between genetic polymorphism of T-786C in promoter region, 894G→T at exon 7 of endothelial nitric oxide synthase (eNOS) gene and osteoporosis (OP) disease. Method: The genotypes of 350 patients with osteoporosis and 350 healthy controls were detected by polymerase chain reaction (PCR) and DNA sequencing. The allele ratios and genotype distributions in the patients and controls were assessed using the Pearson χ²-test. Odds ratios (OR) with two tailed P-values and 95% confidence intervals (CI) were calculated as a measure of the association of the eNOS genotypes with OP. Result: the C allele distribution frequency of T-786C eNOS gene in OP group (8.5%) was significantly higher than that in control group (3.9%), relative risk (OR) of OP associated with the CC genotype was 2.68 (95% CI, 0.92 to 1.37). The T allele frequency of 894G→T at exon 7 in eNOS gene in OP group (11.5%) was also significantly higher than that in control group (5.2%), OR of OP associated with the TT genotype was 2.60 (all P<0.05). Conclusion: The analysis results indicated that both T-786C in promoter region and 894G→T at exon 7 of eNOS gene might be genetic predisposal factors of OP, these polymorphisms may be independently or synergic with other loci to have an impact on the incidence of OP.     

Endothelial nitric oxide synthase haplotypes are associated with preeclampsia in Maya mestizo women

Preeclampsia is a specific disease of pregnancy and believed to have a genetic component. The aim of this study was to investigate if three polymorphisms in eNOS or their haplotypes are associated with preeclampsia in Maya mestizo women. A case-control study was performed where 127 preeclamptic patients and 263 controls were included. Genotyped and haplotypes for the -768T→C, intron 4 variants, Glu298Asp of eNOS were determined by PCR and real-time PCR allelic discrimination. Logistic regression analysis with adjustment for age and body mass index (BMI) was used to test for associations between genotype and preeclampsia under recessive, codominant and dominant models. Pairwise linkage disequilibrium between single nucleotide polymorphisms was calculated by direct correlation r^{2}, and haplotype analysis was conducted. Women homozygous for the Asp298 allele showed an association of preeclampsia. In addition, analysis of the haplotype frequencies revealed that the -786C-4b-Asp298 haplotype was significantly more frequent in preeclamptic patients than in controls (0.143 vs. 0.041, respectively; OR =3.01; 95% CI = 1.74-5.23; P =2.9 × 10^{-4}).Despite the Asp298 genotype in a recessive model associated with the presence of preeclampsia in Maya mestizo women, we believe that in this population the -786C-4b-Asp298 haplotype is a better genetic marker.     

A novel multiplex PCR-RFLP method for simultaneous detection of the MTHFR 677 C > T, eNOS +894 G > T and - eNOS -786 T > C variants among Malaysian Malays

ABSTRACT: BACKGROUND: Hyperhomocysteinemia as a consequence of the MTHFR 677 C > T variant is associated with cardiovascular disease and stroke. Another factor than can potentially contribute to these disorders is a depleted nitric oxide level, which can be due to the presence of eNOS +894 G > T and eNOS 786 T > C variants that make an individual more susceptible to endothelial dysfunction. A number of genotyping methods have been developed to investigate these variants. However, simultaneous detection methods using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis are still lacking. In this study, a novel multiplex PCR-RFLP method for the simultaneous detection of MTHFR 677 C > T and eNOS +894 G > T and eNOS 786 T > C variants was developed. A total of 114 healthy Malay subjects were recruited. The MTHFR 677 C > T and eNOS +894 G > T and eNOS 786 T > C variants were genotyped using the novel multiplex PCR-RFLP and confirmed by DNA sequencing as well as snpBLAST. Allele frequencies of MTHFR 677 C > T and eNOS +894 G > T and eNOS 786 T > C were calculated using the Hardy Weinberg equation. METHODS: The 114 healthy volunteers were recruited for this study, and their DNA was extracted. Primer pair was designed using Primer 3 Software version 0.4.0 and validated against the BLAST database. The primer specificity, functionality and annealing temperature were tested using uniplex PCR methods that were later combined into a single multiplex PCR. Restriction Fragment Length Polymorphism (RFLP) was performed in three separate tubes followed by agarose gel electrophoresis. PCR product residual was purified and sent for DNA sequencing. RESULTS: The allele frequencies for MTHFR 677 C > T were 0.89 (C allele) and 0.11 (T allele); for eNOS +894 G > T, the allele frequencies were 0.58 (G allele) and 0.43 (T allele); and for eNOS 786 T > C, the allele frequencies were 0.87 (T allele) and 0.13 (C allele). CONCLUSIONS: Our PCR-RFLP method is a simple, cost-effective and time-saving method. It can be used to successfully genotype subjects for the MTHFR 677 C > T and eNOS +894 G > T and eNOS 786 T > C variants simultaneously with 100 % concordance from DNA sequencing data. This method can be routinely used for rapid investigation of the MTHFR 677 C > T and eNOS +894 G > T and eNOS 786 T > C variants.