Transcription Factor 7-like 2 Gene Research Articles

Frequency of Transcription Factor 7-like 2 rs12255372 Mutation among Bangladeshi Adult Type 2 Diabetes Patients

ABSTRACT Background: While the etiology of type 2 diabetes mellitus (T2DM) is complex, genetic markers for T2DM are surfacing fast, and amidst such markers, the transcription factor 7-like 2 (TCF7L2) gene has been emerged as the most promising T2DM-causing gene. The intronic variant rs12255372 of the TCF7L2 gene has been found to be strongly associated with T2DM in different ethnic populations. Objectives: The objectives of this study were to determine the frequency of rs12255372 polymorphism in the TCF7L2 gene in Bangladeshi adult population with T2DM. Materials and Methods: This cross-sectional study was conducted in the Department of Endocrinology, Bangabandhu Sheikh Mujib Medical University. Eighty T2DM patients were recruited consecutively by nonrandom sampling, who signed the informed consent, history, and clinical features including height, weight, and waist circumferences were recorded. Blood samples were collected. Genomic DNA was extracted and single-nucleotide polymorphisms rs12255372 (G>T) were determined by the restriction fragment length polymorphism (RFLP) method. Statistical Analysis: RFLP results were analyzed by the gel electrophoresis to get the frequency of rs12255372 polymorphism. The independent segregation of alleles was tested for Hardy–Weinberg equilibrium using the Chi-square test of goodness of fit. P ≤0.05 was considered statistically significant. Results: The minor (T) allele frequencies (MAF) for rs12255372 (G>T) among T2DM was 28%. The observed genotype frequencies of rs12255372 (G>T) were different than those expected from the Hardy–Weinberg equation. Conclusion: The minor T allele frequency of rs12255372 (G>T) among T2DM participants was about one-fourth.

Haplotype-based association study of TCF7L2 gene variants with the development of diabetic retinopathy in an Iranian population

ABSTRACT Background Diabetic retinopathy (DR) is recognized as one of the most prevalent complications of diabetes and a major cause of morbidity. Transcription factor 7-like 2 (TCF7L2), a pivotal component in the Wnt-signaling pathway, plays a significant role in β-cell development, blood-glucose homeostasis, cell survival, cell migration, and cell proliferation. Thus, this study aimed to assess the association between TCF7L2 variants (rs7903146, rs11196205, and rs12255372) with DR in a population-based association study. Materials and Methods DNA was extracted from whole blood of all subjects by salting-out procedure. Total 524 T2DM patients including 234 T2DM individuals without DR and 290 T2DM individuals with DR were genotyped by TaqMan assay technology. Clinical characteristics of subjects were conducted to evaluate the plausible association between TCF7L2 variants and DR with univariate linear regression analysis. Results Demographic analysis between case and control groups revealed significant differences in FBS, HbA1c, lipidemia, heart disease, and family history of T2DM (p < 0.05). No significant difference was observed in either genotypes distribution or allele frequency (p > 0.05) between T2DM individuals with and without DR in any models of inheritance. Genotype-phenotype association showed no significant association. Result of analysis indicated that HbAlc with adjusted OR of 1.8 (p < 0.0001) and first-degree relatives of family history with adjusted OR of 3.04 (p < 0.0001) were significantly associated with DR. Finally, haplotype analysis showed no noticeable association. Conclusion In conclusion, there was no significant genetic association between rs7903146, rs11196205, and rs12255372 with DR among T2DM Iranians; however, these variants may play unknown roles in other populations.

TCF7L2: A potential key regulator of antidepressant effects on hippocampal astrocytes in depression model mice

Clinical and preclinical studies suggest that hippocampal astrocyte dysfunction is involved in the pathophysiology of depression; however, the underlying molecular mechanisms remain unclear. Here, we attempted to identify the hippocampal astrocytic transcripts associated with antidepressant effects in a mouse model of depression. We used a chronic corticosterone-induced mouse model of depression to assess the behavioral effects of amitriptyline, a tricyclic antidepressant. Hippocampal astrocytes were isolated using fluorescence-activated cell sorting, and RNA sequencing was performed to evaluate the transcriptional profiles associated with depressive effects and antidepressant responses. Depression model mice exhibited typical depression-like behaviors that improved after amitriptyline treatment; the depression group mice also had significantly reduced GFAP-positive astrocyte numbers in hippocampal subfields. Comprehensive transcriptome analysis of hippocampal astrocytes showed opposing responses to amitriptyline in depression group and control mice, suggesting the importance of using the depression model. Transcription factor 7 like 2 (TCF7L2) was the only upstream regulator gene altered in depression model mice and restored in amitriptyline-treated depression model mice. In fact, TCF7L2 expression was significantly decreased in the depression group. The level of TCF7L2 long non-coding RNA, which controls mRNA expression of the TCF7L2 gene, was also significantly decreased in this group and recovered after amitriptyline treatment. The Gene Ontology biological processes associated with astrocytic TCF7L2 included proliferation, differentiation, and cytokine production. We identified TCF7L2 as a gene associated with depression- and antidepressant-like behaviors in response to amitriptyline in hippocampal astrocytes. Our findings could provide valuable insights into the mechanism of astrocyte-mediated antidepressant effects.

Association between Transcription Factor 7-Like 2 Gene Polymorphisms rs7903146 and rs12255372 with the Risk of Diabetic Nephropathy among South Indian Population

Abstract Introduction: Transcription factor 7-like 2 (TCF7L2) gene has been associated with the genetic predisposition of type 2 diabetes mellitus (T2DM) and diabetic nephropathy (DN) in different populations. The study aimed to explore the correlation between rs7903146 and rs12255372 polymorphisms of TCF7L2 gene and DN among the South Indian population. Methods: Polymerase chain reaction (PCR)-based direct sequencing method and allele-specific PCR were used to determine the genotypes of TCF7L2 polymorphisms in 20 normal glucose tolerance (NGT) participants, 35 T2DM patients without DN and 35 T2DM patients with DN. The differences in genotype and allelic distribution between the study groups were analyzed by Chi-square test and odds ratio (OR) with 95% confidence interval (CI) which were used to indicate the relative risk of DN. Results: The distribution of TCF7L2 gene polymorphism rs7903146 prevalence was as follows: in the NGT group, CC, 65%; CT, 30%; TT, 5%; in the T2DM without DN group, CC, 25.71%; CT, 62.86%; TT, 11.43%; and in the T2DM with DN group, CC, 31.43%; CT, 60.0%; TT, 8.57%. The distribution of rs12255372 was as follows: in the NGT group, GG, 80%; GT, 15%; TT, 5%; in the T2DM without DN group, GG, 42.86%; GT, 41.46%; TT, 8.57%; and in the T2DM with DN group, GG, 48.57%; GT, 40%; TT, 5.71%. The T allele of rs7903146 polymorphism was associated with an increased risk of T2DM without DN (OR = 3.0; 95% CI = 1.21–7.437; P = 0.010) and T2DM with DN (OR = 2.51; 95% CI = 1.00–6.252; P = 0.04), and the T allele of rs12255372 polymorphism was also associated with increased risk of T2DM without DN (OR = 3.42; 95% CI = 1.18–9.902; P = 0.018) and not with T2DM with DN when compared with NGT individuals. Conclusion: In our study, the T allele of the rs7903146 single-nucleotide polymorphism in the TCF7L2 gene confers the risk of developing DN in diabetes patients, but the T allele of the rs12255372 polymorphism in the TCF7L2 gene is associated with T2DM and its association with DN is arbitrated through T2DM.

Novel linkage and association of TCF7L2 variants with PCOS in Italian families.

Transcription factor 7-like 2 (TCF7L2) gene variants confer risk for type 2 diabetes and metabolic traits. We investigated the role of TCF7L2-variants in polycystic ovarian syndrome (PCOS), which is a common endocrine metabolic disorder affecting women of reproductive age. We tested whether TCF7L2 variants are in linkage to and/or in linkage disequilibrium [(LD), namely linkage and association)] with PCOS. Within 212 families from the Italian peninsular population, we analyzed 78 variants using Pseudomarker software for linkage to and LD with PCOS under the dominant model with complete penetrance (D1). In a secondary analysis, we tested the variants under the recessive models with complete penetrance (R1), dominant with incomplete penetrance (D2), and recessive with incomplete penetrance (R2). We tested through in silico analysis the risk variants to detect any potential functional effects. We identified a total of 14 variants in the TCF7L2 gene significantly linked to and/or in LD with the risk of PCOS (p < 0.05) across different models. This study is the first to report TCF7L2 linkage and linkage disequilibrium in Italian families with PCOS.

Association of transcription factor 7-like 2 rs12255372 polymorphism with susceptibility of type 2 diabetes mellitus in Bangladeshi population.

Polymorphism of transcription factor 7-like 2 (TCF7L2) has a link with type 2 diabetes mellitus (T2DM) through β cell dysfunction that causes defect in blood glucose homeostasis. This case-control study recruited 67 T2DM as cases and 65 age-matched healthy individuals as controls to determine whether the polymorphism rs12255372 (G > T) in the TCF7L2 gene have an association with T2DM in Bangladeshi population. Genomic DNA was purified from peripheral whole blood sample and direct Sanger sequencing was done for genotyping of SNP. Bivariate logistic regression was done to find out the association between genetic variant and T2DM. In our study, the minor T allele frequency was significantly more frequent in T2DM group than healthy controls (29.1% vs. 16.9%). After adjusting with confounding factors, heterozygous-genotype GT had higher odds of developing T2DM (OR 2.4; 95% CI: 1.0-5.5; p value = 0.04) and in dominant model, having SNP in TCF7L2 increased the risk of T2DM 2.3 times (95% CI: 1.0-5.2; p value = 0.04). In interaction model, genetic susceptible SNP cases interacted significantly with increasing age and BMI, female gender, and having family history of diabetes mellitus to develop T2DM (pinteraction < 0.001). Having minor T allele either in heterozygous or homozygous variant form of rs12255372 (G > T) TCF7L2 had significant association with T2DM. In conclusion, TCF7L2 gene variant increases risk of developing T2DM among the Bangladeshi population.

Single Nucleotide Polymorphism at rs7903146 of Transcription Factor 7-like 2 gene Among Subjects with Type 2 Diabetes Mellitus in Myanmar.

To investigate the association between the single nucleotide polymorphism (SNP) rs7903146 in the transcription factor 7-like 2 (TCF7L2) gene and type 2 diabetes mellitus (T2DM) and to examine the impact of this variant on pancreatic beta-cell function in the Myanmar population. A case-control study was undertaken in 100 subjects with T2DM and 113 controls. The SNP rs7903146 was genotyped using the allele-specific polymerase chain reaction method. Plasma glucose and serum insulin levels were determined using the enzymatic colorimetric method and ELISA respectively. Beta-cell function was calculated by the HOMA-β formula. The frequencies of carrier genotypes (CT and TT) were higher in subjects with T2DM than in controls. The minor T alleles of rs7903146 were found to statistically increase type 2 diabetes risk than the C allele with an allelic odds ratio of 2.07 (95% CI 1.39-3.09, p=0.0004). The mean HOMA-β level of the group with non-carrier genotype (CC) was significantly higher than that of the groups with carrier genotypes (CT and TT) in subjects with T2DM and controls with a p-value of 0.0003 and less than 0.0001, respectively. The rs7903146 variant of the TCF7L2 gene was found to be associated with T2DM and low β-cell function among Myanmar subjects.

Novel TCF7L2 familial linkage and association with Type 2 diabetes, depression, and their comorbidity.

Alterations in the activity of the transcription factor 7-like 2 (TCF7L2) generate defects previously associated with neuropsychiatric disorders. We investigated the role of the TCF7L2 gene in major depressive disorder (MDD), type 2 diabetes (T2D), and MDD-T2D comorbidity. We tested whether TCF7L2 is in linkage to and/or in linkage disequilibrium (LD, namely association) with MDD, T2D, and MDD-T2D. In 212 families with T2D and MDD in the Italian population, we analyzed 80 microarray-based SNPs using Pseudomarker software for linkage to and LD with T2D and MDD under the recessive model with complete penetrance (R1). In a secondary analysis, we tested the variants under the dominant models with complete penetrance (D1), recessive with incomplete penetrance (R2), and recessive with incomplete penetrance (R2). We found several novel linkage signals and genetic associations. In addition, we found two new transcription-factor (TF) binding sites created by two risk variants found: the MDD-risk variant rs12255179 creates a new TF-binding site for the CCAAT/enhancer-binding protein α (C/EBPα), and the T2D-risk variant rs61872794 creates a new TF-binding site for the organic cation-uptake transporter (OCT1). Both new binding sites are related to insulin metabolism. These results highlight the cross-interactivity between T2D and MDD. Further replication is needed in diverse ethnic groups.

Genomic Study of TCF7L2 Gene Mutation on Insulin Secretion for Type 2 DM Patients: A Review

Aim: This paper aims to establish whether a correlation between TCF7L2 gene mutation on insulin secretion for Type 2 DM Patients.&#x0D; Background: Diabetes type 2 is the most common metabolic disorder worldwide. Beta cell dysfunction reduces insulin secretion and increases the glucose level in the blood and insulin resistance that raises the glucose production in the liver and decreases the glucose uptake to muscle, liver, and adipose tissue causing hyperglycemia (T2DM). TCF7L2 (transcription factor 7–like 2) works as a nuclear Receptor for CTNNB1(B catenin) that mediated the WNT signaling pathway (a group of signal transduction pathways made of proteins that pass signals from outside a cell through cell surface receptors to the inside of the cell) and any variation will cause the development of T2DM.&#x0D; Methods: GenBank in NCBI database was used to extract the DNA sequence and mRNA sequence of the TCF7L2 gene (an accession number of the gene, number of amino acids, exons, and length of nucleotides). FASTA format was also useful to retrieve the nucleotide sequence and get the function of the protein. BLAST was used to compare the protein product of the TCF7L2gene between humans and gorillas, and pygmy chimpanzees (Pan paniscus).&#x0D; Results: The accession number is NC_000010.11, the number of amino acids in the protein product is 602, the number of exons found is 20 and the gene is in chromosome 10. Finally, many organisms have the same gene as dogs, cows, mice, rats, zebrafish, and frogs.&#x0D; Conclusion: There is a strong association between TCF7L2 (transcription factor 7–like 2) alleles (rs7903146) T alleles and T2DM. It was found that there is a high frequency of diabetic type two patients having TCF7L2 (transcription factor 7–like 2) alleles (rs7903146) with a high frequency of the T allele.

Review Article: SNP rs11196205 Transcription Factor 7 Like 2 (TCF7L2) as a Metabolic Disorder Genetic Marker

A metabolic disorder appears when unusual chemical reactions impair the metabolism process in the body. This condition affects how the body distributes and processes macronutrients, including protein, lipids, and carbohydrates. Transcription Factor 7 Like 2 (TCF7L2) is a 217,460 bp gene, found in chromosome 10q25, and encodes the High Mobility Group (HMG) box with a role in the Wnt signaling pathway. The Wnt signaling pathway involves several processes during development, healthy homeostasis, and illness. The reactions that follow the pathway's activation regulate both proliferation and differentiation. Single Nucleotide Polymorphism (SNP) in the TCF7L2 gene has been linked to a variety of metabolic disorders incidence. SNP rs11196205 was found to have a significant association with type 1 and type 2 diabetes mellitus, gestational diabetes mellitus, glucose homeostasis, obesity-related parameters, and renal function. Mechanism SNPs causing the metabolic disorder are still unexplained, but SNPs are suspected to affect transcription and splicing processes. SNPs of TCF7L2 genes are reported to affect proinsulin conversion to insulin, decrease incretin hormone production, and decrease insulin sensitivity throughout the body. It can conclude that the screening for the SNP can be a sign of metabolic process abnormalities, especially in diabetes Mellitus.

Association of Transcription Factor 7 Like 2 (TCF7L2) ( rs7903146) Gene Polymorphisms with Some Trace Elements in the Type 2 Diabetes Mellitus Patients in Al-Najaf Governorate

The widespread prevalence of diabetes has led to a serious health risk for humans. Hyperglycemia is a hallmark of diabetes. Assessing the relation of TCF7L2 gene polymorphism (rs7903146) on the occurrence of T2DM in the Alnajaf population, and evaluating the impact of this investigated SNP on phenotypic parameters like BMI, fasting blood sugar(F.B.S), lipid profile , Mg and Zn. A case-control study of 800 individuals (400 T2DM and 400 apparently healthy control individuals) was done. The laboratory work was carried out in the laboratory of Department of Clinical Laboratory Sciences in the Faculty of Pharmacy and in the laboratory of Department of Chemistry in the Faculty of Sciences / the University of Kufa. DNA from whole blood was extracted and genotyping of TCF7L2 gene (rs7903146) polymorphism polymorphisms were carried out by RFLP –PCR. The results of this study showed that there is a significant association between the transcription factor 7-like 2 (TCF7L2) gene polymorphisms rs7903146 gene polymorphism with T2DM in the Alnajaf population. TCF7L2 gene polymorphism (rs7903146) did not show any major changes in relation to BMI, FSG, cholesterol, HDL-C, VLDL-C, or T.G, but there were significant changes in LDL, magnesium, and zinc.

Influence of KCNQ1 and TCF7L2 genes associated with the role of type 2 diabetes

T2DM is a long-term metabolic disorder characterized by either the pancreas' inability to produce enough insulin or the body's inability to properly utilize the insulin it produces. The β-cell function and blood glucose homeostasis are two areas where TCF7L2 (Transcription factor 7 like 2) appears to be a significant candidate gene. KCNQ1 (potassium voltage-gated channel subfamily, member 1 has been discovered as a T2DM susceptibility gene in Asian populations by genome-wide association studies with rs2237892 polymorphism and an increased risk of developing T2DM. The aim of this study was to investigate the association between rs7903146 and rs2237892 SNP studies in T2DM patients. In this study, 60 T2DM cases and 60 controls were selected. Genotyping was performed for rs7903146 and rs2237892 SNPs using specific primers and restriction enzymes, then all PCR products were loaded on an agarose gel stained with ethidium bromide. The current study results confirmed rs7903146 SNP was strongly associated with genotype (OR-4.14; 95%CI:1.07-15.98; p=0.02) and allele frequencies (OR-4.60; 95%CI:1.66-12.70; p=0.001) whereas in rs2237892 SNP was not associated with any of the genotypes (OR-4.29; 95%CI:0.46-39.58; p=0.16; OR-3.21) or allele frequencies (OR-6.26; 95%CI:0.74-52.83; p=0.055). The current study results were found to be associated with global studies carried out in rs7903146 and rs2237892 SNP. The strength of this current study was to involve Saudi nationalities and we have screened rs7903146 and rs2237892 SNPs which plays a major role in T2DM. Involving 60 T2DM cases/60 controls was the major limitation of this study. Missing validation through Sanger sequencing analysis was one of the limitations of this study. In conclusion, the current study results confirmed rs7903146 SNP was strongly associated with T2DM and rs2237892 SNP was not associated with T2DM patients.

Used Toothbrush as a Potential Source of Gene Expression Among Subjects With Systemic Disease and Adverse Habits.

Purpose To explore the viability of used toothbrush as a source of gene expression and comparison of the same among tobacco, alcohol, diabetic and hypertensive subjects. Materials and methods Fourteen subjects with a history of type 2 diabetes mellitus (T2DM) and hypertension were allocated to Group I, 14 subjects with tobacco and alcohol habits allocated to Group II and 14 healthy subjects allocated to Group III. Genetic materials retrieved from the used toothbrush of the study subjects were assessed for genetic expression of cyclin-dependent kinase 4 (CDK4), Bcl-2-like protein 4 (BAX), cyclin-dependent kinase inhibitor 2A (CDKN2A), B-cell lymphoma 2 (BCL2), G-protein beta-3 (GNB3), and subunit gene and transcription factor 7-like 2 (TCF7L2) by polymerase chain reaction (PCR). Results BAX gene showed reduced expression in tobacco and alcohol users (p=0.0497). BCL2, CDK4, and GNB3 showed no significant difference in expression in both the groups and with control. CDKN2A was expressed at a lower level in Group I and II participants. TCF7L2 showed higher expression in Group 2 participants (p=0.001). Conclusion The study concluded that used toothbrush is a reliable source for genetic expression. There was no difference in BCL2, CDK4, and GNB3 gene expression between subjects with systemic disease, adverse habits and healthy controls. There is a downregulation of BAX and upregulation of TCF7L2 gene in subjects with adverse habits.

The correlation between transcription factor 7-like 2 gene polymorphisms and susceptibility of gestational diabetes mellitus in the population of central China: A case-control study.

ObjectiveTo investigate the correlation between transcription factor 7-like 2 (TCF7L2) gene polymorphisms and gestational diabetes mellitus (GDM) risk in the central Chinese population.MethodsThis case–control study examined the association of seven TCF7L2 gene single-nucleotide polymorphisms (SNPs) (rs11196218, rs4506565, rs7895340, rs7901695, rs11196205, rs12243326, and rs290487) with GDM risk in the central Chinese population (843 GDM and 877 controls). The clinical information and blood samples were collected by trained interviewers and nurses. Genotyping of SNPs was conducted on the Sequenom MassARRAY platform. Statistical analyses including t-test, ANOVA, chi-square test, Fisher’s exact test, and logistic regression were performed.ResultsDifferences in age, pre-pregnant body mass index (BMI), and family history of type 2 diabetes mellitus (T2DM) between the case and control groups were significant (p < 0.05). Compared with the wild-type genotype, pregnant women with genotypes of rs4506565-AT (OR = 1.89, 95%CI: 1.18–3.02), rs7895340 GA (OR = 1.93, 95%CI: 1.06–3.54), rs7901695-TC (OR = 1.79, 95%CI: 1.11–2.88), and rs11196205-GC (OR = 2.15, 95%CI: 1.16–3.98) had a significantly higher risk of GDM, adjusted by age, pre-pregnant BMI, and family history of T2DM. Functional annotation showed that all these four SNPs fell in the functional elements of human pancreatic islets. Further cumulative effects analysis concluded that when participants carried all these four risk genotypes, the risk of GDM was 3.51 times (OR = 3.51, 95%CI: 1.38–8.90) than that of those without any risk genotypes.ConclusionsThe findings of this study suggested that rs4506565, rs7895340, rs7901695, and rs11196205 were the genetic susceptibility SNPs of GDM in the central Chinese population. Further studies are needed to validate our findings and clarify the underlying mechanisms.

Dysregulation of Wnt signaling in bone of type 2 diabetes mellitus and diabetic Charcot arthropathy

BackgroundType 2 diabetes mellitus (T2DM) patients show a markedly higher fracture risk and impaired fracture healing when compared to non-diabetic patients. However in contrast to type 1 diabetes mellitus, bone mineral density in T2DM is known to be normal or even regionally elevated, also known as diabetic bone disease. Charcot arthropathy is a severe and challenging complication leading to bone destruction and mutilating bone deformities. Wnt signaling is involved in increasing bone mineral density, bone homeostasis and apoptotic processes. It has been shown that type 2 diabetes mellitus is strongly associated with gene variants of the Wnt signaling pathway, specifically polymorphisms of TCF7L2 (transcription factor 7 like 2), which is an effector transcription factor of this pathway.MethodsBone samples of 19 T2DM patients and 7 T2DM patients with additional Charcot arthropathy were compared to 19 non-diabetic controls. qPCR analysis for selected members of the Wnt-signaling pathway (WNT3A, WNT5A, catenin beta, TCF7L2) and bone gamma-carboxyglutamate (BGLAP, Osteocalcin) was performed and analyzed using the 2-ΔΔCt- Method. Statistical analysis comprised one-way analysis of variance (ANOVA).ResultsIn T2DM patients who had developed Charcot arthropathy WNT3A and WNT5A gene expression was down-regulated by 89 and 58% compared to healthy controls (p < 0.0001). TCF7L2 gene expression showed a significant reduction by 63% (p < 0.0001) and 18% (p = 0.0136) in diabetic Charcot arthropathy. In all diabetic patients BGLAP (Osteocalcin) was significantly decreased by at least 59% (p = 0.0019).ConclusionsFor the first time with this study downregulation of members of the Wnt-signaling pathway has been shown in the bone of diabetic patients with and without Charcot arthropathy. This may serve as future therapeutic target for this severe disease.

PPARɣ2, aldose reductase, and TCF7L2 gene polymorphisms: relation to diabetes mellitus.

Diabetes mellitus (DM) is a growing global health concern. Genetic factors play a pivotal role in the development of diabetes. Therefore, the present work aimed to study the relation between peroxisome proliferator-activate receptors (PPARɣ2) (rs3856806), aldose reductase (AR) (rs759853), transcription factor 7 like 2 (TCF7L2) (rs7903146) gene polymorphism with diabetes in the Egyptian population. The study included 260 diabetics and 120 healthy subjects. Genotyping was done using polymerase chain reaction-restriction fragment length polymorphism. Regression analysis revealed that PPARɣ2 TT, TCF7L2 TT were suggested to be independent risk predictors for T1DM and TCF7L2 TC, CC genotype were suggested to be independent protective factors against T1DM development. On the other hand, PPARɣ2 TT, AR TT genotypes were suggested to be independent risk predictors for T2DM susceptibility, and PPARɣ2 CT genotypes were suggested to be independent protective factors against T2DM development. The present study revealed that PPARγ2 (rs3856806), TCF7L2 (rs7903146) and AR (rs759853) gene polymorphism may play an important role in the susceptibility of diabetes. Therefore, these polymorphisms may have a prognostic value for diabetes in the Egyptian population. Further work is required to confirm the role of these polymorphisms in diabetes.

Role of Transcription Factor 7 like 2 and Silent Information Regulator 1 Genes in the Development of Cardiovascular Complications in a Group of Egyptian Patients with Chronic Kidney Disease

BACKGROUND: Sirtuins silent information regulator 1 (SIRT) is histone deacetylases that act as antioxidants and involved in the pathogenesis of cardiovascular diseases (CVD) which are the major complications of chronic kidney disease (CKD). Transcription factor 7-like 2 (TCF7L2) genetic polymorphisms could contribute to the risk of CVD as TCF7L2 proteins regulate vascular remodeling. AIM: We tried to demonstrate the role of genetic polymorphisms: rs7069102 and rs10823108 in SIRT1 gene and rs7903146 in TCF7L2 gene in the development of CVD in CKD Egyptian patients. METHODS: This study included 120 CKD patients (60 with CVD and 60 without CVD) and 60 age and sex-matched healthy subjects as a control group. Routine laboratory investigations were performed and genotyping for candidate single nucleotide polymorphisms was done by Taqman-real-time polymerase chain reaction. RESULTS: The frequency of the C allele of rs7069102 was significantly higher in CKD patients with CVD as compared to the normal control group (p &lt; 0.001) and as compared to CKD patients without CVD (p &lt; 0.001). Percentages of AG and GG genotypes of rs10823108 were significantly higher in CKD patients with CVD as compared to the normal control group (p = 0.002, 0.035, respectively). The frequency of the T allele of rs7903146 was significantly higher in CKD patients with CVD as compared to the normal control group (p &lt; 0.001). CONCLUSION: We found that C allele of rs7069102, GG and AG genotypes of rs10823108 in the SIRT1 gene and T allele of rs7903146 in TCF7L2 gene have a potential role in the pathogenesis and the risk of CVD development in CKD Egyptian patients.

Association of Variant rs7903146(c/t) Single Nucleotide Polymorphism of Transcription Factor 7-like 2 Gene with Newly Detected Hyperglycemia in Pregnancy.

Background:Transcription factor 7-like 2 (TCF7L2) gene has a significant role in hyperglycemia in pregnancy (HIP) risk. The current study was planned with the aim to evaluate the association of single nucleotide polymorphism (SNP) rs7903146 in patients of newly detected HIP among Indian population of northern region.Methods:This study was an observational case control study done among newly detected HIP (The World Health Organization (WHO) criteria, 2013) and healthy pregnant females without diabetes. Participants from both the group were genotyped for rs7903146 (C/T) variant of TCF7L2 gene using polymerase chain reaction–restriction fragment length polymorphism (PCR–RFLP) technique.Results:A total of 71 cases of newly detected HIP were included in the study, out of which 25 (35.2%) of them were of first-time detected diabetes mellitus in pregnancy (DIP) and 46 (64.7%) were of gestational diabetes (GDM) and 100 were pregnant females without diabetes in third trimester were enrolled as controls. Average age of participants in the case group was 28.7 ± 4.0 years and the control group were 26.5 ± 3.6 years (P value 0.09). The wild homozygous CC genotype, heterozygous CT genotype and homozygous TT genotype were present in 39.4%, 53.5%, 7.1% of case group vs 53%, 43% and 4% of control group, respectively. No significant association of rs7903146(C/T) SNP of TCF7L2 gene in HIP (CC/CT, CC/TT P value 0.15, 0.38, respectively) in our population was found. There was no significant difference in the distribution of genotypes between DIP and GDM.Conclusion:This study shows no evidence of association of rs7903146(C/T) SNP of TCF7L2 gene with newly detected HIP in our population.

Lifestyle Modifications on the Expression of TCF7L2 Gene Polymorphism: A Cross-sectional Study

Introduction: Type 2 Diabetes Mellitus (T2DM) is the result of the clustering of factors along with the communication between environmental factors and a strong hereditary component. In this modern age of investigation, molecular mechanisms of Transcription Factor 7 Like 2 (TCF7L2) linking with the physiological functioning in pancreatic and intestinal endocrine cells are explored. Hitherto few studies have been done in the Indian population with regard to gene polymorphism in TCF7L2 and T2DM concerning family history. Aim: To study effect of lifestyle modifications on the expression of TCF7L2 gene polymorphism in subjects with family history of diabetes. Materials and Methods: This was a cross-sectional study, conducted over a period of 14 months September 2020 to November 2021) with 121 subjects from Shimoga district at Shimoga Institute of Medical Sciences, Shivamogga, Karnataka, India. The study was conducted after the approval by the Ethics Committee and subjects volunteering for the study have signed the informed consent. The study comprised of two groups. Both the groups had family history of T2DM, eventually persons who had not developed diabetes and had changed their lifestyle were grouped I (n=56) and subjects who had developed diabetes without any changes in their lifestyle were considered as group II (n=65). Fasting insulin, and fasting blood glucose was estimated along with the anthropometric variables like height, weight, waist circumference, hip circumference. Two Single Nucleotide Polymorphism (SNP) (rs7903146 and rs1225372) of TCF7L2 gene was genotyped using Tetra-primer Amplification Refractory Mutation System (T-ARM) protocol. Differences in clinical parameters and genotypic variants between groups, was calculated using the independent t-test and Chi-square test, a p value of &lt;0.05 was considered statistically significant. Results: Only fasting insulin and WHR Waist Hip Ratio (WHR) parameters were weakly significant in the study population. The risk allele frequency (T) was seen to be higher in the group I and the chances of getting diabetics was 2.02 times higher than the subjects of group II for rs7903146. This substantiates that the group I subjects were more predisposed to diabetes genetically. Since subjects with heterozygous genotype (CT or GT alleles) has been associated with the highest risk of developing T2DM, the association of heterozygous genotype was high in the group with lifestyle modification and was highly significantly associated with risk of being diabetic by 7.50 times for rs7903146 and 6.10 times for rs1225372. Further risk analysis of variants according to a model of inheritance was analysed and was observed that the co-dominant and overdominant models best fitted the association with an OR above 6 for both the polymorphism. Conclusion: This study depicts that lifestyle modification masks the effect of risk variants for rs12255372 and rs7903146. The confounding nature of the influence of environmental factors over predisposition to inheritance is well depicted for the manifestation of T2DM among the genetic variants of TCF7L2.

Are single nucleotide polymorphisms rs7903146 and rs12255372 in transcription factor 7-like 2 gene associated with an increased risk for gestational diabetes mellitus in Egyptian women?

BackgroundGenetic variants in the transcription factor 7-like 2 (TCF7L2) gene are related with type 2 diabetes (T2D) and gestational diabetes mellitus (GDM) in various populations, but there are not enough statistics regarding GDM among Egyptian women. We aimed by this study to evaluate the effect of two polymorphisms of rs7903146 and rs12255372 in the TCF7L2 gene with the development of GDM among Egyptian women. ResultsWe enrolled 114 pregnant women with normal glucose tolerance and 114 with GDM according to the International Association of Diabetes and Pregnancy Study Groups (IADPSG) guidelines. We gathered records on blood pressure, body mass index (BMI), blood glucose level, hemoglobin A1C (HbA1c), and lipid profile. The genotyping of rs7903146 and rs12255372 polymorphisms was carried out using polymerase chain reaction–restriction fragment length polymorphism (PCR-RFLP). The statistical significance of prepregnancy BMI, fasting blood sugar (FBS), HbA1c, low-density lipoprotein (LDL), and total cholesterol (Tch) was higher, P < 0.001, in GDM women in comparison to pregnant women without GDM. CT and TT genotypes in rs7903146 SNP were 46.5% vs. 54%, P <0.04, OR; CI = 1.9 (1.0 to 3.78); TT carriers were 37.7% vs. 9.6%, P <0.001, OR (CI) = 8.9 (3.7–21.1), respectively. For the TCFL2 gene rs12255372 SNP, GT carriers were 48.2% vs. 39.5%, P= 0.004, OR (CI) = 2.3 (1.3–4.2), while TT carriers were 24.6% vs. 7.9%, P < 0.001, OR (CI) = 6 (2.5–14.3). ConclusionThe study showed there is a significantly higher incidence of CT/TT genotypes in rs7903146 SNP and GT/TT genotypes in rs12255372 SNP in TCF7L2 gene among GDM women in comparison to healthy pregnant women (controls).