TCF7L2 rs7903146 polymorphism is associated with gastric cancer: a case-control study in the Venezuelan population

AIM: To explore the association between TCF7L2 rs12255372 and rs7903146 single nucleotide polymorphisms(SNPs) and gastric cancer risk in Venezuelan patients.METHODS: We performed a case-control study including 122 paraffin-embedded archived intestinaltype gastric cancer samples and 129 biopsies obtained by superior endoscopy from chronic gastritis patients. Gastric cancer samples were classified according the degree of carcinoma differentiation. Genomic DNA was extracted from tissues, and the two SNPs of TCF7L2 gene(rs12255372 and rs7903146) were genotyped by polymerase chain reaction-restriction fragment length polymorphism reactions. Multiple regression analysis with adjustments for age and gender were performed and best-fitting models of inheritance were determined.RESULTS: After adjusting for age and sex the TCF7L2 rs7903146 TT genotype was associated with gastric cancer risk under the recessive genetic model(OR = 3.11, 95%CI: 1.22-7.92, P = 0.017). We further investigated the distribution of rs12255372 and rs7903146 genotypes according gastric cancer stratified by degree of differentiation, and we observed that carriers of rs7903146 T allele(CT + TT vs CC) had a significantly increased risk of moderate/well differentiated gastric cancer(dominant model, OR = 2.55, 95%CI: 1.35-4.80, P = 0.004), whereas the rs7903146 TT genotype was associated with poorly differentiated gastric cancer in the recessive model(OR = 3.65, 95%CI: 1.25-10.62, P = 0.018). We did not find association between rs12255372 SNP and the susceptibility of developing gastric cancer. CONCLUSION: TCF7L2 rs7903146 polymorphism is associated with gastric cancer risk in the Venezuelan population, and could be related to determine the degree of differentiation of tumor cells.     

Association of TCF7L2 rs7903146 Gene Polymorphism with the Risk of NAFLD and CAD in the Chinese Han Population

Background and Aims: Coronary artery disease (CAD) is a major cause of morbidity and mortality in patients with non-alcoholic fatty liver disease (NAFLD). Previous studies have suggested that TCF7L2 rs7903146 was related to the risk of developing NAFLD but the conclusions are not consistent and no related study has been conducted in Chinese populations. The aim of this study was to investigate the association between TCF7L2 rs7903146 and the risk of developing NAFLD and CAD in a Chinese Han population.Methods: TCF7L2 rs7903146 genotypes were measured by the MALDI-TOF-MS from 143 NAFLD patients, 159 CAD patients, 131 NAFLD + CAD patients, and 212 healthy controls. The demographic data and serum lipid profiles of all subjects were collected. The distributions of genotype and allele frequency in each group were also tested. Logistic regression was used to investigate the risk of TCF7L2 rs7903146 with NAFLD and CAD. All statistical analyses were conducted using SPSS 23.0.Results: There were no significant differences in the distributions of TCF7L2 rs7903146 genotype and allele frequency in each of the two groups, and the TCF7L2 rs7903146 CT + TT genotype did not increase the risk of developing NAFLD, CAD, and NAFLD + CAD. Except for body mass index in the control group, the differences of clinical parameters between the TCF7L2 rs7903146 T allele carriers and non-carriers in each group were not significant. In the non-obese group, the TCF7L2 rs7903146 CT + TT genotype was a protective factor for the development of NAFLD in the non-obese subjects (odds ratio=0.359, 95% confidence interval: 0.134-0.961, p = 0.041).Conclusions: TCF7L2 rs7903146 was not associated with the risk of developing NAFLD, CAD, and NAFLD + CAD in the Chinese Han population. In the non-obese population, the TCF7L2 rs7903146 CT + TT genotype was a protective factor against the development of NAFLD.     

Transcription factor 7-like 2 (TCF7L2) gene polymorphism rs7903146 is associated with stroke in type 2 diabetes patients with long disease duration

Associations between TCF7L2 SNP and diabetic complications and diabetes-related factors were investigated. Subjects with rs7903146 variant had significantly higher prevalence of stroke (24.1% vs. 11.1%; P = 0.039) among subjects exhibiting a long disease duration (≥10 years). In conclusion, the TCF7L2 SNP variant may confer a higher risk of stroke in diabetic patients.     

TCF7L2基因rs7903146T/C和rs7901695T/C单核苷酸多态性与内蒙古汉族人群2型糖尿病易感性的相关性研究

目的研究内蒙古地区汉族人群中T2DM易感性与TCF7L2基因rs7903146T/C和rs7901695T/C位点单核苷酸多态性(SNPs)是否相关。方法收集T2DM患者和正常体检人群的抗凝血,采用等位基因特异性PCR(AS-PCR)进行SNPs分析;运用SHEsis软件对T2DM组和正常对照(NC)组的TCF7L2基因的SNPs位点进行连锁不平衡和单倍型分析。结果rs7903146T/C和rs7901695T/C位点的基因型分布在T2DM及NC组间的分布差异无统计学意义(P>0.05),但rs7903146T/C位点的T和C等位基因频率在两组间的分布差异有统计学意义(P<0.05)。rs7903146T/C和rs7901695T/C位点连锁平衡(D′=0.060),rs7901695T-rs7903146T单倍型在T2DM组的频率明显高于NC组(P<0.01,OR=1.803,95%CI:1.183～2.7487)。结论在内蒙古地区汉族人群,rs7903146位点C→T多态性可能与T2DM关联,携带突变等位基因T可增加罹患T2DM的风险,rs7901695位点C→T多态性与T2DM易感性无明显相关性,但rs7901695T-rs7903146T单倍型与T2DM发病风险相关。     

Glucose tolerance,free fatty acid,and serum insulin responses in patients with cirrhosis

The blood glucose, free fatty acids, and serum insulin responses to a 75-g oral glucose load were studied in 25 cirrhotic patients and the results compared with those obtained in 25 normal control subjects. Twenty-two of the patients with cirrhosis had impaired glucose tolerance. This was associated with elevated free fatty acid levels in 17 instances. Two additional patients had increased free fatty acids with normal glucose tolerance. Hyperinsulinemia was demonstrated in each patient with liver disease, including the 3 with normal glucose tolerance. Although the exact mechanism for the increased insulin response to glucose is not clear, the concurrence of hyperglycemia and hyperinsulinemia is best explained by insulin resistance. The elevated free fatty acids present in most of these patients may contribute to this insulin insensitivity.     

Interrelationship of the rs7903146 TCF7L2 gene variant with measures of glucose metabolism and adiposity: The NEO study

Background and aims

We investigated the interrelationship of rs7903146-T in TCF7L2 with measures of glucose metabolism and measures of adiposity.

Association between plasma levels of proprotein convertase subtilisin/kexin type 9 (PCSK9) and lipids with rs7903146 polymorphisms of the TCF7L2 gene in diabetic patients

The rs7903146 polymorphism of TCF7L2 gene is known as the strongest genetic risk factor for type 2 diabetes mellitus (T2DM). The polymorphism is in association with clinical profile of T2DM patients. PCSK9 is a serine protease that promotes LDLR degradation and regulates circulating levels of lipids. The association of this polymorphism with PCSK9 and metabolic profile of diabetic and healthy subjects was investigated. This cross-sectional study was performed on 132 T2DM patients and the same number of healthy subjects. All the participants were genotyped for the rs7903146 single nucleotide polymorphism by the PCR-RFLP method. Metabolic profile including plasma levels of PCSK9, triglycerides, total cholesterol, non-HDL cholesterol, LDL cholesterol, HDL cholesterol, fasting plasma glucose, and HBA1C was measured. PCSK9, total cholesterol, and LDL-C levels were lower in the diabetic patients as compared to the healthy subjects. There were also direct and significant associations between PCSK9 and TG, TC, LDL-C, and non HDL-C in the subjects. Values of plasma glucose, HbA1c, PCSK9, TC, and LDL-C were higher in patients with TT genotype, but the differences were not statistically significant for all. A positive Spearman correlation was found between PCSK9 levels and the genotypes in all the participants. The results confirm the association of rs7903146 in the TCF7L2 gene with metabolic parameters and PCSK9. The T allele was associated with higher lipid and PCSK9 levels.

     

Glucose and free fatty acid turnover in Cushing's syndrome

Glucocorticoids are known to have acute effects on glucose and free fatty acid (FFA) metabolism. The effects of the longstanding hypercorticism of Cushing's syndrome were studied by isotopic techniques in a group of Cushingoid patients compared to a control group. In the Cushing's group, glucose production and utilization rates were significantly higher than in control subjects, while FFA turnover also tended to be higher, but not significantly. It is suggested that increased glucose production is the main cause of the hyperglycemia seen in Cushing's syndrome.     

TCF7L2基因与2型糖尿病

转录因子7类似物2(TCF7L2)常见变异在不同的种族中几乎都与2型糖尿病显著相关.TCF7L2剪接有显著的组织特异性,在2型糖尿病患者的胰岛内TCF7L2 mRNA水平增高.其变异与胰岛素分泌功能减退有关,机制可能是其特异性损害肠促胰素(incretin)如胰高血糖素样肽-1(GLP-1)诱导的胰岛素分泌,也可能因胰岛素原向胰岛素的转换异常,和(或)参与Wnt信号通路的激活而致2型糖尿病.因此对2型糖尿病致病基因TCF7L2基因的研究有助于揭示糖尿病的发病机制、病理生理及为糖尿病的治疗提供新的靶点.