Polymorphisms in methylenetetrahydrofolate reductase gene: Their impact on liver steatosis and fibrosis of chronic hepatitis c patients

Aim & Background: The mechanism of steatosis in Hepatitis C virus infection is multifactorial;therefore, it is complex and unclear. The aim of this study was to investigate the effects of methylentetrahydrofolate reductase (MTHFR) gene polymorphisms on the course of chronic hepatitis C virus infection and the development of steatosis due to hepatitis C virus. Methods: This study included 109 patients with chronic hepatitis C virus infection. Necroinflammatory activity, degrees of fibrosis and steatosis and MTHFR gene polymorphisms were investigated. Polymerase chain reaction-restriction fragment length polymorphism was used to determine MTHFR C677T and A1298C polymorphisms. Results: Fibrosis was correlated with age (r = 0.336, p = 0.002), platelet (r = ?0.448, p < 0.0001), ALT (r = 0.241, p = 0.026), AST (r = 0.361) and GGT (r = 0.224, p = 0.039). Steatosis was only correlated with fibrosis. MTHFR C677T and A1298C polymorphisms did not have a significant effect on the degree of steatosis (p = 0.857, p = 0.202 respectively). There was a relation between MTHFR C677T and the degree of fibrosis but not A1298C (p = 0.014, p = 0.187 respectively). Conclusion: We found that MTHFR C677T polymorphism contributed to the development of fibrosis in patients with chronic hepatitis C virus infection.

Single nucleotide polymorphism C677T in the methylenetetrahydrofolate reductase gene might be a genetic risk factor for infertility for Chinese men with azoospermia or severe oligozoospermia

Aim： To analyze the distribution of the single nucleotide polymorphism （SNP） C677T in the methylenetetrahydrofolate reductase （MTHFR） gene in 355 infertile Chinese patients with idiopathic azoospermia or severe oligozoospermia and 252 fertile Chinese men as controls to explore the possible association of the SNP and male infertility. Methods： Using the polymerase chain reaction （PCR）-restriction fragment length polymorphism technique, the allele and genotype distribution of SNP C677T in the MTHFR gene were investigated in both patients and controls. Results： The frequencies of allele T （40.9% vs 30.4%, P = 0.002, odds ration [OR] = 1.58, 95% confidence interval [CI]： 1.24-2.02） and mutant homozygote （TT） （18.3% vs. 11.5%, P = 0.023, OR = 1.72, 95% CI： 1.07-2.76） as well as carrier with allele （TT ＋ CT） （63.4% vs. 49.2%, P = 0.0005, OR = 1.79, 95% CI： 1.29-2.48） in infertile patients were significantly higher than those in controls. After patient stratification, the significant differences in distribution of the SNP between each patient subgroup and control group still remained. Conclusion： Our findings indicate that there is an association of SNP C677T in the MTHFR gene with male infertility, suggesting that this polymorphism might be a genetic risk factor for male infertility in Chinese men.

Methylenetetrahydrofolate Reductase Gene Polymorphism C677T is Associated with Increased Risk of Coronary Heart Disease in Chinese Type 2 Diabetic Patients

Objective Chronic cardiovascular diseases induced by long-term poor blood glucose control are the main cause of death in patients with type 2 diabetes mellitus(T2DM).Previous researches report that methylenetetrahydrofolate reductase gene(MTHFR)polymorphisms might influence the occurrence of coronary heart disease(CHD)in T2DM patients.The purpose of this study was to evaluate whether MTHFR C677T and A1298C mutations are associated with the risk of CHD inT2DM patients.Methods A total of 197 subjects with T2DM were studied,of which 95 patients with CHD.The genotypes of MTHFR C677T and A1298C were analyzed by using dideoxy chain-termination method,and compared between patients with CHD and those without CHD.Results We found that the frequency of the 677T allele was significantly higher in T2DM patients with CHD than those without CHD(P=0.011).However,there was no significant difference in any of the examined haplotypes between T2DM patients with and without CHD.Furthermore,the 677T allele was associated with a higher risk of CHD development in diabetic patients with lower homocysteine(Hey)levels(≤15μmol/L)(P=0.006),while no effect of MTHFR gene polymorphism on the incidence of CHD was found in patients with higher Hey levels(>15 μmol/L)(P=0.491).Conclusion The MTHFR C677T gene polymorphism is associated with the risk of CHD of diabetic patients and could be used as an effective marker for CHD in Chinese diabetic populations with normal Hey levels.

Relationship between granulomatous lobular mastitis and methylene tetrahydrofolate reductase gene polymorphism

BACKGROUND Variations in the methylene tetrahydrofolate reductase(MTHFR)gene have been reported as risk factors for numerous conditions,including cardiovascular disease,thrombophilia,stroke,hypertension and pregnancy-related complications.Moreover,it was reported there is an association between breast cancer and mutations in MTHFR-C677T.However,whether there is an association between MTHFR gene polymorphism and granulomatous lobular mastitis or not has been rarely investigated.AIM To analyze the association between MTHFR gene polymorphism and granulomatous lobular mastitis.METHODS Fifty-one patients with granulomatous lobular mastitis admitted to The First Hospital of Kunming were selected as study samples.Their hospitalization time ranged from February 2018 to February 2019.The 51 patients were included in the experimental group,and another 51 women who underwent physical examination at The First Hospital of Kunming in the same period were included in the control group.Deoxyribonucleic acid and MTFR genetic polymorphism testing were performed in each group.The association between MTHFR gene polymorphism and granulomatous lobular mastitis was observed.RESULTS There were significant differences in genotype frequency and allele frequency of C/C and C/T between the experimental group and the control group(all P<0.05).However,there was no significant difference in frequency of T/T genotype between the two groups(P>0.05).In addition,there was no significant difference in genotype frequency and allele frequency of A/A,A/C and C/C between the two groups(P>0.05).CONCLUSION MTHFR gene C677T locus polymorphism is closely related to granulomatous lobular mastitis.

Association of C(-106)T Polymorphism in Aldose Reductase Gene with Diabetic Retinopathy in Chinese Patients with Type 2 Diabetes Mellitus

Objective To identify the possible association between C（-106）T polymorphism of the aldose reductase （ALR） gene and diabetic retinopathy （DR） in a cohort of Chinese patients with type 2 diabetes mellitus （T2DM）. Methods From November 2009 to September 2010, patients with T2DM were recruited and assigned to DR group or diabetic without retinopathy （DWR） group according to the duration of diabetes and the grading of 7-field fundus color photographs of both eyes. Genotypes of the C（-106）T polymorphism （rs759853） in ALR gene were analyzed using the MassARRAY genotyping system and an association study was performed. Results A total of 268 T2DM patients （129 in the DR group and 139 in the DWR group） were included in this study. No statistically significant differences were observed between the 2 groups in the age of diabetes onset （P=0.10） and gender （P=0.78）. The success rate of genotyping for the study subjects was 99.6% （267/268）, with one case of failure in the DR group. The frequencies of the T allele in the C（-106）T polymorphism were 16.0% （41/256） in the DR group and 19.4% （54/278） in the DWR group （P=0.36）. There was no signit^cant difference in the C（-106）T genotypes between the 2 groups （P=0.40）. Compared with the wild-type genotype, odds ratio （OR） for the risk of DR was 0.7 （95% CI, 0.38-1.3） for the heterozygous CT genotype and 0.76 （95% CI, 0.18-3.25） for the homozygous TT genotype. The risk of DR was positively associated with microalbuminuria （OR=4.61; 95% CI, 2.34-9.05） and insulin therapy （OR=3.43; 95% CI, 1.94-6.09）. Conclusions Microalbuminuria and insulin therapy are associated with the risk of DR in Chinese patients with T2DM. C（-106）T polymorphism of the ALR gene may not be significantly associated with DR in Chinese patients with T2DM.

Methylenetrahydrofolate Reductase Gene C677T Polymorphism and Diabetic Retinopathy: a Meta-Analysis

Objective To investigate the association between the methylenetetrahydrofolate reductase gene C677T(MTHFR C677T)polymorphism and diabetic retinopathy(DR).Methods A total of 6971 subjects including 2707 DR patients and 4264 controls from 23 studies were enrolled in the study.A random-effects model was applied to estimate the overall effects and the stratified effects of the MTHFR C677T polymorphism on the risk of DR,and study quality was also assessed.Results Strong associations were observed between the MTHFR C677T polymorphism and DR.The carries of MTHFR C677T were more likely to be found in the DR group in relative to the healthy control group with odds ratio 1.6&2.55,and 2.31 respectively in allele contrast model(T vs.C,95%CZ:1.29-2.18,P<0.001,f=7&4%),homozygous model(TT vs.CC,95%CZ:1.70-3.83,P=0.008,72=54.4%)and dominant model(TT+CT vs.CC,95%CZ:1.62-3.29,P<0.001,12=74.7%).This association can also be found in contrast to the Ned(non-complicated diabetic mellitus)group(allele contrast,OR—1.50,95%Ch 1.07-2.11,P=0.032,I2=62.1%;homozygous,OR—2.39,9S%CZ:1.06-5.38,P=0.017,Z2=66.7%;dominant,OR=1.59,95%CZ:0.97-2.62,P=0.056,I2=56.5%).For the heterozygous model(CT vs.CC),the association was significant in contrast to the healthy control group(OR=1.46,95%CZ:1.64-3.69,P=0,P=77.3%),while in contrast to the Ned control group the association was not statistically meaningful(OR=1.38,95%CZ:0.87-2.18,P=0.131,Z2=43.7%).For the recessive model,1.92-fold increased risk was found only in contrast to the Ned control group(95%C1:1.07-3.43,P=0.064,P=55.0%).There was no significant association found in the models in contrast to the DM control group.Conclusion In this meta-analysis,we found an association between the MTHFR C677T polymorphism and DR,especially in contrast to the Ned control group.Further studies are required to establish more definite relationship.

Plasma Homocysteine and Gene Polymorphisms Associated with the Risk of Hyperlipidemia in Northern Chinese Subjects

Objective To examine the relationship between occurrence of hyperlipidemia, plasma homocysteine and polymorphisms of methylenetetra hydrofolate reductase （MTHFR） gene and methionine synthase （MS） gene. Methods A total of 192 hyperlipidemia patients were selected and divided into hypercholesterolemia group, hypertriglyceridemia group, and combined hyperlipidemia group. Another 208 normal individuals were selected as control. Total plasma homocysteine （tHcy） concentration was measured by high-performance liquid chromatography （HPLC）. Lipid profiles were measured for all subjects The polymorphisms of MTHFR gene C677T and MS gene A2756G were analyzed by PCR-RFLP. Results The tHcy concentration in the combined hyperlipidemia patients was significantly higher than that in the control （15.95μmol/L vs 13.43 μmol/L, P〈0.05）. The prevalence of hyperhomocysteinemia （HHcy） in the combined hyperlipidemia group was significantly higher than that in the control （42.2% vs 23.0%, P=0.015）, with the odds ratio （OR） of 3.339 （95%CI： 1.260-8.849）. The hyperlipidemia patients with HHcy had a higher concentration of total cholesterol （TC） than that in the normal tHcy patients （5.67±0.95 mmol/L vs 5.47±0.92 retool/L, P=0.034）. There was no significant difference in genotype or allele frequencies of MTHFR C677T between the hyperlipidemic and control groups. The hyperlipidemia patients with MTHFR CT/TT genotype had a higher concentration of triglyceride （TG） than those with CC genotype （2.24±1.75 mmol/L vs 1.87±0.95 mmol/L, P〈0.05）. Individuals with CT/TT genotype had a higher concentration of tHcy than those with 677CC genotype both in the hyperlipidemia group （12.61±1.24μmol/L vs 11.20±1.37 μmol/L, P〈0.05） and in the control group （14.04±1.48 μmol/L vs 12.61±1.24 μmol/L, P〈0.05）. The percentage of MS 2756 GG/AG genotype in the combined hyperlipidemia group was significantly higher than that in the control （26.7% vs 13.0%, P=0.012）, with the OR of 3.121 （95%C1： 1.288-7.65/）. The hyperlipidemia patients with MS 2756AG/GG genotype had a higher concentration of TC （5.87±0.89 mmol/L vs 5.46±0.93 retool/L, P〈0.05） and LDL-C （3.29±0.81 mmol/L vs 2.94±0.85 retool/L, P〈0.05） than those with AA genotype. However, individuals with 2756AG/GG genotype showed no significant difference in tHcy among those with AA genotype. Conclusion HHcy and MS A2756G mutation may be the risk factors for combined hyperlipidemia. Further study is needed to confirm the role of HHcy and MS A2756G mutation in the development of hyperlipidemia.

Polymorphisms and functions of the aldose reductase gene 5' regulatory region in Chinese patients with type 2 diabetes mellitus

Objective To screen the 5’ regulatory region of the aldose reductase (AR) gene for genetic variabilities causing changes in protein expression and affecting the promoter function. Methods The screenings were carried out by polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP). All SSCP variants were submitted for DNA sequencing and inserted into the plasmid chloromycetin acetyl transferase (CAT) enhancer vector. The constructs were used to transfect Hela cells,and CAT assays were performed to assess promoter activity. Gel mobility shift and footprinting assays were also performed to determine the interaction between the DNA and nuclear proteins. Results Two polymorphisms, C(-106)T and C(-12)G, were identified in the regulatory region in 123 Chinese control subjects and 145 patients with type 2 diabetes mellitus. The frequencies of genotypes WT/WT, WT/C(-12)G and WT/C(-106)T were not significantly different between the subjects and patients. In the patients with and without retinopathy, frequencies of WT/C(-106)T were 31.5% and 17.5% (P【0.05) respectively, and the frequencies of WT/C(-12)G were 10.5% and 2.5% (P】0.05) respectively. The total frequency of WT/C(-12)G and WT/C(-106)T in patients with retinopathy was 41.8%, significantly higher than that (20.0%) in patients without retinopathy (P【0.025). The relative transcription activities of the wild-type, the C(-12)G and the C(-106)T were 15.7%, 31.0% and 32.2%, respectively. The results of DNA-protein interaction assays showed that these variations did not change the binding site of DNA with trans-acting factors. Conclusion The polymorphisms C(-12)G and C(-106)T strongly associated with diabetic retinopathy in the Chinese population have been identified in the regulatory region of the aldose reductase gene.

MTHFR基因多态性对脑梗死患者阿替普酶静脉溶栓后出血性转化的影响

目的分析亚甲基四氢叶酸还原酶(MTHFR)基因多态性对脑梗死患者阿替普酶静脉溶栓后出血性转化(HT)的影响。方法回顾性分析2020年7月—2023年7月在安徽医科大学附属阜阳人民医院接受治疗的120例脑梗死患者的临床资料。依据治疗后24~72 h HT发生情况分为HT组(15例)、无HT组(105例)。比较两组基线资料、MTHFR基因多态性、纤维蛋白原(Fib)、同型半胱氨酸(Hcy)。采用多因素一般Logistic回归模型分析脑梗死患者阿替普酶静脉溶栓后HT发生的危险因素。绘制受试者工作特征(ROC)曲线,分析入院时美国国立卫生院卒中量表(NIHSS)评分、Hcy预测脑梗死患者阿替普酶静脉溶栓后HT发生的价值。结果HT组心房颤动发生率、MTHFR基因型677CT占比、入院时NIHSS评分、Hcy水平均高于无HT组(P<0.05)。多因素一般Logistic回归分析结果显示:心房颤动史[OR=1.478(95%CI:1.126,1.940)]、入院时NIHSS评分升高[OR=1.656(95%CI:1.125,2.438)]、MTHFR基因型为677CT[OR=1.871/2.362(95%CI:1.052,3.328/1.081,4.652)]、Hcy水平升高[OR=2.149(95%CI:1.108,4.168)]均为脑梗死患者阿替普酶静脉溶栓后HT发生的危险因素(P<0.05)。ROC曲线分析结果显示,入院时NIHSS评分、Hcy均可预测脑梗死患者阿替普酶静脉溶栓后HT发生,其敏感性分别为80.0%(95%CI:0.765,0.883)、73.3%(95%CI:0.717,0.834),特异性分别为74.3%(95%CI:0.659,0.817)、74.3%(95%CI:0.824,0.931)。677CT型患者Hcy水平高于677CC、677TT型患者(P<0.05)。结论心房颤动、MTHFR基因型、入院时NIHSS评分、Hcy均为影响脑梗死患者阿替普酶静脉溶栓后HT发生的重要因素,临床应结合以上指标对高危患者进行重点筛查,尽早采取干预措施。

MTHFR基因多态性及血清AFP水平与胎儿神经管畸形的关系

目的分析亚甲基四氢叶酸还原酶(MTHFR)基因多态性及血清甲胎蛋白(AFP)与胎儿神经管畸形的关系。方法选取2018年1月至2023年11月在陕西省宝鸡市妇幼保健院引产或分娩的50例胎儿神经管畸形产妇作为观察组,另选取150例胎儿健康产妇作为对照组。比较两组MTHFR基因多态性分布情况及血清AFP水平,比较观察组不同MTHFR基因多态性血清AFP水平,采用多因素Logistic回归分析胎儿神经管畸形的危险因素。结果观察组MTHFR C677T基因CT基因型+TT基因型、MTHFR A1298C基因AC基因型+CC基因型比例及血清AFP水平高于对照组,差异均有统计学意义(P<0.05)。观察组MTHFR C677T基因CT基因型+TT基因型产妇血清AFP水平高于CC基因型,MTHFR A1298C基因AC基因型+CC基因型产妇血清AFP水平高于AA基因型,差异均有统计学意义(P<0.05)。多因素Logistic回归分析结果显示,MTHFR C677T基因CT基因型+TT基因型、MTHFR A1298C基因AC基因型+CC基因型是发生胎儿神经管畸形的危险因素(P<0.05)。结论MTHFR C677T基因、MTHFR A1298C基因多态性及血清AFP水平与胎儿神经管畸形有关,在预测胎儿神经管畸形方面有一定应用价值。

基于CRISPR/Cas12a的叶酸代谢位点MTHFR基因C677T多态性检测方法的建立

目的开发一种基于CRISPR/Cas12a技术的叶酸代谢位点c.677(MTHFR C677T)的高效检测方法,以实现对C677T多态性的快速、准确分析。方法采用重组酶聚合酶扩增(RPA)结合CRISPR/Cas12a建立单管检测反应体系,建立人MTHFR基因C677T基因分型策略;测试200例孕妇人群样本MTHFR基因C677T多态性,并与常规PCR产物测序结果进行一致率比较。结果基于CRISPR/Cas12a检测人MTHFR基因C677T多态性的检测方法结果准确、特异性好,与PCR产物测序结果具有高度一致性。结论建立的基于CRISPR/Cas12a检测技术的人MTHFR C677T基因分型方法简单、快捷、精准,为叶酸代谢位点MTHFR C677T基因型检测提供了新的途径,具有潜在的临床应用前景。

830例育龄妇女MTHFR基因A1298C位点多态性研究

目的探讨育龄妇女5,10-亚甲基四氢叶酸还原酶(MTHFR)基因A1298C位点基因多态性与年龄及民族是否有关,为指导育龄期妇女进行叶酸补充提供参考。方法采集2019年1月至2023年4月在该院门诊进行孕前或孕期行优生健康检查的汉族及其他民族的育龄女性外周血标本830例。采用PCR荧光探针法检测MTHFR基因A1298C位点的多态性,进行各年龄段及不同民族人群间基因多态性位点基因型分布比较。结果830例育龄期妇女中,MTHFR基因A1298C位点AA、AC及CC基因型频率分别为69.64%、27.35%和3.01%;各年龄段育龄女性MTHFR基因A1298C位点的基因型和等位基因频数和频率分布情况进行比较,差异均无统计学意义(P>0.05);汉族与藏族、回族、土族及蒙古族育龄女性间的MTHFR基因A1298C位点的基因型和等位基因频数和频率分布情况比较,差异均无统计学意义(P>0.05)。结论育龄妇女MTHFR基因A1298C位点多态性与年龄及民族无关,但有不同于其他地区的MTHFR基因A1298C位点多态性分布特征。

H型高血压急性缺血性脑卒中患者亚甲基四氢叶酸还原酶C677T基因多态性及其与肾功能的相关性

目的观察H型高血压急性缺血性脑卒中患者亚甲基四氢叶酸还原酶(MTHFR)C677T的基因多态性,分析其与H型高血压急性缺血性脑卒中患者肾功能的相关性。方法选择153例H型高血压急性缺血性脑卒中患者为观察组,同期158例非H型高血压急性缺血性脑卒中患者为对照组。两组均采集外周静脉血,采用PCR扩增和微阵列技术检测MTHFR C677T基因型,测算全身免疫炎症指数(SII),采用日立7600型全自动生化分析仪检测两组血清肌酐,据此测算肾小球滤过率(eGFR)。采用多元线性回归分析法分析MTHFR C677T基因型与H型高血压急性缺血性脑卒中患者同型半胱氨酸(Hcy)、eGFR的相关性,采用Spearman相关分析法分析SII与H型高血压急性缺血性脑卒中患者eGFR、Hcy的相关性。结果与对照组相比,观察组患者TT基因型分布频率最高,T等位基因频率最高(χ^(2)分别为19.188、5.138,P均<0.05)。观察组、对照组患者SII分别为583.54(384.97,903.73)、425.03(310.26,583.16),二者相比,P<0.05。与CC、CT基因型比较,TT基因型的H型高血压急性缺血性脑卒中患者血清Hcy水平高,eGFR水平低(F分别为28.544、3.749,P均<0.05)。MTHFR C677T TT基因型与H型高血压急性缺血性脑卒中患者血清Hcy呈正相关(β=4.173,P<0.05),与eGFR呈负相关(β=-6.559,P<0.05)。SII与H型高血压急性缺血性脑卒中血清Hcy水平呈正相关(r=0.226,P<0.05),与eGFR呈负相关(r=-0.129,P<0.05)。结论H型高血压急性缺血性脑卒中患者MTHFR C677T基因型主要为TT型。MTHFR C677T TT基因型的H型高血压急性缺血性脑卒中患者可能更易引起肾功能下降。

MTHFR基因C677T位点多态性与PCOS患者胰岛素抵抗的关系

目的探讨亚甲基四氢叶酸还原酶(MTHFR)C677T基因多态性与多囊卵巢综合征(PCOS)患者胰岛素抵抗(IR)的关系。方法选取2022年1月—2023年11月复旦大学附属妇产科医院PCOS患者145例(PCOS组)和健康体检女性87名(对照组)。检测所有研究对象MTHFR基因C677T位点多态性和空腹血糖(FPG)、空腹胰岛素(FINS)水平。另检测PCOS患者同型半胱氨酸(Hcy)、总胆固醇(TC)、三酰甘油(TG)、叶酸、维生素B12(Vit B12)、维生素D(Vit D)水平。对PCOS患者行胰岛素释放试验(IRT)。计算胰岛素敏感指数(ISI)、胰岛素抵抗指数(HOMA-IR)、胰岛素曲线下面积(AUCINS)。根据是否发生IR将健康体检女性和PCOS患者分别分为IR组和非IR组。结果健康体检女性中,IR组和非IR组之间MTHFR C677T位点基因型和等位基因频率差异均无统计学意义(P>0.05)。PCOS患者中,IR组CT、TT基因型分布和T等位基因频率均高于非IR组(P<0.05),2个组之间IRT结果和FINS、FPG、Hcy、TG、ISI、AUCINS差异均有统计学意义(P<0.05),其他指标2个组之间差异均无统计学意义(P>0.05)。PCOS患者中,非IR组CT和TT基因型携带者TC水平高于CC基因型携带者(P<0.05),TT基因型携带者Hcy水平高于CC和CT基因型携带者(P<0.05);IR组各基因型携带者之间各项指标差异均无统计学意义(P>0.05)。结论MTHFR C677T位点多态性与PCOS患者IR有关。在未发生IR的PCOS患者中,TT基因型患者Hcy和TC水平显著升高。

叶酸代谢能力评估及亚甲基四氢叶酸还原酶基因多态性检测试剂盒性能验证

目的对江西诺德医疗器械有限公司生产的叶酸代谢能力测定试剂盒进行性能验证,评估该试剂盒能否满足江苏省常熟地区患者对亚甲基四氢叶酸还原酶(MTHFR)基因A1298C(rs1801131)及C677T(rs1801133)两个多态性位点的检测需求。方法收集10例临床样本进行测序,将结果作为“金标准”,同时采用实时荧光聚合酶链反应(PCR)对标本的MTHFR基因多态性位点进行检测,与“金标准”结果比较,验证试剂盒的准确性。选择测序确定的C677T多态性位点CC及TT基因型标本各1份,A1298C多态性位点AA及CC基因型标本各1例,重复测定5次以验证试剂盒的精密度。同时对以上4份不同基因型的标本进行DNA浓度测定,根据试剂盒说明书中的性能描述,稀释至最低检出浓度5 mg/L,每例标本各检测3次,要求基因分型结果一致且符合测序分型结果,验证试剂盒的检测下限。结果所有标本的MTHFR基因多态性位点检测结果与测序结果完全一致,准确率达到100%;对不同基因型的4例标本反复检测5次的结果完全一致,且循环阈值(Ct值)的变异系数(CV)≤5%;而稀释到检测下限的4例标本经过3次重复检测后,仍能准确进行基因分型。结论采用MTHFR基因A1298C及C677T两个多态性位点检测试剂盒进行基因分型的结果准确、稳定、可靠,能满足实验室对MTHFR基因多态性检测的要求。

MTHFR和PAI-1基因多态性与2型糖尿病患者下肢深静脉血栓发生风险的相关性研究

目的探讨亚甲基四氢叶酸还原酶(MTHFR)C677T突变和纤溶酶原激活物抑制物-1(PAI-1)4G/5G基因多态性与2型糖尿病患者下肢深静脉血栓(DVT)发生风险的相关性。方法对2022年5月至2023年4月收治的240例2型糖尿病患者的MTHFR和PAI-1基因型进行分析。依据是否发生DVT分为非DVT组57例和DVT组183例。利用PCR-RFLP检测这2种基因的多态性,收集2组患者的临床资料,比较2组MTHFR C677T和PAI-14G/5G基因多态性、不同MTHFR C677T基因型同型半胱氨酸水平,分析下肢DVT发生的风险因素。结果DVT组中吸烟患者比例高于非DVT组,D-二聚体升高患者占比高于非DVT组(P<0.01)。DVT组MTHFR C677T TT基因型频率与非DVT组比较差异无统计学意义(P>0.05)。DVT组中PAI-14G4G基因型频率显著高于非DVT组(P<0.01)。携带MTHFR C677T TT基因型的患者同型半胱氨酸水平显著高于非携带者(P<0.05),DVT组中TT基因型同型半胱氨酸水平高于非DVT组(P<0.05)。携带MTHFR C677T TT和PAI-14G4G基因型的2型糖尿病患者发生下肢DVT的风险显著增加,OR值为7.33,排除环境因素影响后,OR'值为12.65。结论PAI-14G4G基因型是2型糖尿病患者发生下肢DVT的独立风险因素;MTHFR C677T TT和PAI-14G4G基因型同时存在时,2型糖尿病患者发生下肢DVT的风险提高。

亚甲基四氢叶酸还原酶C677T多态性与急性脑梗死5年复发风险的回顾性队列研究

目的探究亚甲基四氢叶酸还原酶(MTHFR)C677T多态性与急性脑梗死(AIS)5年复发风险的关系。方法采用回顾性队列研究方法,选取2015-01—2017-12徐州医科大学附属医院收治的582例AIS患者,对患者进行为期5 a的随访,根据是否复发分为复发组(153例)和未复发组(429例),比较2组患者MTHFR基因型分布,分析MTHFR基因型与AIS复发的关系。结果单因素分析显示,复发组患者年龄、糖尿病、心房颤动、入院NIHSS评分、D-二聚体(D-D)、Hcy等与未复发组患者比较差异有统计学意义(P<0.05)。C677T基因型在复发组及未复发组中的分布均符合Hardy-Weinberg平衡定律,具有群体代表性(t=0.552,P=0.834)。复发组与未复发组的C677T基因型及等位基因频率比较均有统计学差异(χ^(2)=13.694、14.890,P=0.001、<0.001)。经过5 a随访,复发组中TT基因型占比最高,为43.79%。Cox回归分析显示,年龄、糖尿病、心房颤动、入院NIHSS评分、D-D、Hcy、C677T位点均是影响AIS患者复发的危险因素(P<0.05)。采用Kaplan-Meier生存曲线分析MTHFR C677T位点多态性与AIS患者复发的相关性,结果显示MTHFR C677T位点多态性与AIS患者的复发相关,TT基因型的AIS患者具有更差的生存率(P<0.05)。结论MTHFR C677T位点多态性与AIS患者复发有关,TT基因型患者有更高的5年复发率及更低的5年生存率。

亚甲基四氢叶酸还原酶基因C677T多态性及同型半胱氨酸与高脂血症的关联性

目的探讨亚甲基四氢叶酸还原酶基因(MTHFR)C677T多态性及血浆同型半胱氨酸(Hcy)水平与高脂血症的关联性。方法收集1591例研究对象,采用聚合酶链式反应-限制性片段长度多态性(PCR-RFLP)技术检测MTHFR C677T基因多态性,采用酶循环法检测血浆Hcy,同时检测血脂水平,按血脂水平将研究对象分组,其中高脂血症组694例,健康对照组897例,比较两组MTHFR C677T基因多态性及血浆Hcy的差异。统计工具采用SPSS17.0统计软件。结果高脂血症组的MTHFR C677T基因CC、CT、TT三种基因型频率和C、T两种等位基因频率,以及血浆Hcy水平与健康对照组比较差异无显著性意义(P>0.05)。CC、CT、TT三种不同MTHFR C677T基因型的血浆Hcy水平差异有极显著性意义(P<0.01),而六种血脂水平差异无显著性意义(P>0.05);通过进一步两两比较结果显示,TT基因型的血浆Hcy水平与CC、CT基因型比较差异有极显著性意义(P<0.01),TT基因型的血浆Hcy水平明显高于CC、CT基因型;而CC基因型的血浆Hcy水平与CT基因型比较差异无显著性意义(P>0.05)。结论 MTHFR C677T基因多态性和血浆Hcy水平两者与高脂血症均不具关联性,而MTHFR C677T基因多态性与血浆Hcy水平显著相关,TT基因型的血浆Hcy水平明显高于CC、CT基因型。

动脉粥样硬化性脑梗死患者血浆同型半胱氨酸水平及亚甲基四氢叶酸还原酶基因多态性

目的探讨血浆同型半胱氨酸水平、亚甲基四氢叶酸还原酶基因多态性与动脉粥样硬化性脑梗死之间的关系。方法选择性别、年龄匹配的动脉粥样硬化性脑梗死患者(脑梗死组)68例及对照组50例,采用荧光偏振免疫法测定血浆同型半胱氨酸水平,聚合酶链反应-限制性片长多态性技术检测亚甲基四氢叶酸还原酶基因多态性。结果脑梗死组TT基因型(36.8%比16.0%)及T等位基因频率(59.6%比38.0%)均显著高于对照组(P<0.05)。脑梗死组血浆同型半胱氨酸水平显著高于对照组(P<0.05)。脑梗死组和对照组亚甲基四氢叶酸还原酶677TT纯合子血浆同型半胱氨酸水平均显著高于CT型和CC型者(P<0.05)。结论血浆同型半胱氨酸水平升高是动脉粥样硬化性脑梗死的危险因素。亚甲基四氢叶酸还原酶C677T基因多态性与血浆同型半胱氨酸水平密切相关,与动脉粥样硬化性脑梗死显著相关。