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Reyes-López R, Perez-Luque E, Malacara JM. Relationship of lactation, BMI, and rs12255372 TCF7L2 polymorphism on the conversion to type 2 diabetes mellitus in women with previous gestational diabetes. Gynecol Endocrinol 2019; 35:412-416. [PMID: 30614312 DOI: 10.1080/09513590.2018.1531984] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Women with previous gestational diabetes mellitus (pGDM) have a high risk of developing postpartum type 2 diabetes mellitus (T2DM). This study aimed to analyze the relationship between lactation, BMI, and TCF7L2 polymorphisms in the conversion to T2DM in women with pGDM. One hundred and fifty-three women con pGDM were recruited from public hospitals of León Guanajuato México. Three groups: normal glucose tolerance (NGT), impaired glucose intolerance (IGT), and T2DM after the oral glucose tolerance test were formed. Metabolic and hormone variables were measured, and genotyping was made by PCR-RFLP. The questionnaire included data on lactation (yes/no), duration of lactation, and full lactation. After 35 (21-49) months from the last partum, 54% of women had an NGT, 30.7% IGT, and 15% T2DM. BMI and rs12255372 are associated with the risk of conversion to IGT and T2DM [OR = 1.07 (95% IC 1.0-1.14, p = .041; OR =2.14, 95% IC 1.01-4.55, p = .04 respectively), while the lactation shows a strong protective effects OR = 0.15 (95% IC 0.062-0.39, p = .00007), and an apparent interaction with rs12255372T decreasing the risk in carriers (OR =2.15; 95% IC 0.97-4.7, p = .05). BMI is an independent risk factor of IGT/T2DM development. The lactation shows a strong protective effect and a possible interaction with rs12255372 polymorphism.
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Affiliation(s)
- Ruth Reyes-López
- a Department of Medical Sciences, Division of Health Sciences , University of Guanajuato , León , Mexico
| | - Elva Perez-Luque
- a Department of Medical Sciences, Division of Health Sciences , University of Guanajuato , León , Mexico
| | - Juan Manuel Malacara
- a Department of Medical Sciences, Division of Health Sciences , University of Guanajuato , León , Mexico
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Geoghegan G, Simcox J, Seldin MM, Parnell TJ, Stubben C, Just S, Begaye L, Lusis AJ, Villanueva CJ. Targeted deletion of Tcf7l2 in adipocytes promotes adipocyte hypertrophy and impaired glucose metabolism. Mol Metab 2019; 24:44-63. [PMID: 30948248 PMCID: PMC6531814 DOI: 10.1016/j.molmet.2019.03.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 03/02/2019] [Accepted: 03/09/2019] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE Activation of the Wnt-signaling pathway is known to inhibit differentiation in adipocytes. However, there is a gap in our understanding of the transcriptional network regulated by components of the Wnt-signaling pathway during adipogenesis and in adipocytes during postnatal life. The key intracellular effectors of the Wnt-signaling pathway occur through TCF transcription factors such as TCF7L2 (transcription factor-7-like 2). Several genetic variants in proximity to TCF7L2 have been linked to type 2 diabetes through genome-wide association studies in various human populations. Our work aims to functionally characterize the adipocyte specific gene program regulated by TCF7L2 and understand how this program regulates metabolism. METHODS We generated Tcf7l2F/F mice and assessed TCF7L2 function in isolated adipocytes and adipose specific knockout mice. ChIP-sequencing and RNA-sequencing was performed on the isolated adipocytes with control and TCF7L2 knockout cells. Adipose specific TCF7L2 knockout mice were challenged with high fat diet and assessed for body weight, glucose tolerance, and lipolysis. RESULTS Here we report that TCF7L2 regulates adipocyte size, endocrine function, and glucose metabolism. Tcf7l2 is highly expressed in white adipose tissue, and its expression is suppressed in genetic and diet-induced models of obesity. Genome-wide distribution of TCF7L2 binding and gene expression analysis in adipocytes suggests that TCF7L2 directly regulates genes implicated in cellular metabolism and cell cycle control. When challenged with a high-fat diet, conditional deletion of TCF7L2 in adipocytes led to impaired glucose tolerance, impaired insulin sensitivity, promoted weight gain, and increased adipose tissue mass. This was accompanied by reduced expression of triglyceride hydrolase, reduced fasting-induced free fatty acid release, and adipocyte hypertrophy in subcutaneous adipose tissue. CONCLUSIONS Together our studies support that TCF7L2 is a central transcriptional regulator of the adipocyte metabolic program by directly regulating the expression of genes involved in lipid and glucose metabolism.
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Affiliation(s)
- Gisela Geoghegan
- Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Judith Simcox
- Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Marcus M Seldin
- Department of Human Genetics/Medicine, University of California, Los Angeles, CA, USA; Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, CA, USA
| | - Timothy J Parnell
- Bioinformatics Shared Resources, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA
| | - Chris Stubben
- Bioinformatics Shared Resources, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA
| | - Steven Just
- Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Lori Begaye
- Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Aldons J Lusis
- Department of Human Genetics/Medicine, University of California, Los Angeles, CA, USA; Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, CA, USA
| | - Claudio J Villanueva
- Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT, USA.
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Fernández-Rhodes L, Howard AG, Graff M, Isasi CR, Highland HM, Young KL, Parra E, Below JE, Qi Q, Kaplan RC, Justice AE, Papanicolaou G, Laurie CC, Grant SFA, Haiman C, Loos RJF, North KE. Complex patterns of direct and indirect association between the transcription Factor-7 like 2 gene, body mass index and type 2 diabetes diagnosis in adulthood in the Hispanic Community Health Study/Study of Latinos. BMC Obes 2018; 5:26. [PMID: 30305909 PMCID: PMC6167893 DOI: 10.1186/s40608-018-0200-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 05/23/2018] [Indexed: 01/10/2023]
Abstract
Background Genome-wide association studies have implicated the transcription factor 7-like 2 (TCF7L2) gene in type 2 diabetes risk, and more recently, in decreased body mass index. Given the contrary direction of genetic effects on these two traits, it has been suggested that the observed association with body mass index may reflect either selection bias or a complex underlying biology at TCF7L2. Methods Using 9031 Hispanic/Latino adults (21–76 years) with complete weight history and genetic data from the community-based Hispanic Community Health Study/Study of Latinos (HCHS/SOL, Baseline 2008–2011), we estimated the multivariable association between the additive number of type 2 diabetes increasing-alleles at TCF7L2 (rs7903146-T) and body mass index. We then used structural equation models to simultaneously model the genetic association on changes in body mass index across the life course and estimate the odds of type 2 diabetes per TCF7L2 risk allele. Results We observed both significant increases in type 2 diabetes prevalence at examination (independent of body mass index) and decreases in mean body mass index and waist circumference across genotypes at rs7903146. We observed a significant multivariable association between the additive number of type 2 diabetes-risk alleles and lower body mass index at examination. In our structured modeling, we observed non-significant inverse direct associations between rs7903146-T and body mass index at ages 21 and 45 years, and a significant positive association between rs7903146-T and type 2 diabetes onset in both middle and late adulthood. Conclusions Herein, we replicated the protective effect of rs7930146-T on body mass index at multiple time points in the life course, and observed that these effects were not explained by past type 2 diabetes status in our structured modeling. The robust replication of the negative effects of TCF7L2 on body mass index in multiple samples, including in our diverse Hispanic/Latino community-based sample, supports a growing body of literature on the complex biologic mechanism underlying the functional consequences of TCF7L2 on obesity and type 2 diabetes across the life course. Electronic supplementary material The online version of this article (10.1186/s40608-018-0200-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lindsay Fernández-Rhodes
- 1Department of Epidemiology, UNC Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 123 W Franklin St, Building C, Chapel Hill, NC USA.,2Carolina Population Center, University of North Carolina at Chapel Hill, 123 W Franklin St, Building C, Chapel Hill, NC USA
| | - Annie Green Howard
- 2Carolina Population Center, University of North Carolina at Chapel Hill, 123 W Franklin St, Building C, Chapel Hill, NC USA.,3Department of Biostatistics, UNC Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC USA
| | - Mariaelisa Graff
- 1Department of Epidemiology, UNC Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 123 W Franklin St, Building C, Chapel Hill, NC USA
| | - Carmen R Isasi
- 4Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY USA
| | - Heather M Highland
- 1Department of Epidemiology, UNC Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 123 W Franklin St, Building C, Chapel Hill, NC USA
| | - Kristin L Young
- 1Department of Epidemiology, UNC Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 123 W Franklin St, Building C, Chapel Hill, NC USA
| | - Esteban Parra
- 5Department of Anthropology, University of Toronto at Mississauga, Mississauga, ON Canada
| | - Jennifer E Below
- 6Department of Medicine, Vanderbilt University Medical Center, Nashville, TN USA
| | - Qibin Qi
- 4Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY USA
| | - Robert C Kaplan
- 4Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY USA
| | - Anne E Justice
- 7Biomedical and Translational Informatics Institute, Geisinger Health System, Danville, PA USA
| | - George Papanicolaou
- 8Epidemiology Branch, National Heart Lung and Blood Institute, Bethesda, MD USA
| | - Cathy C Laurie
- 9Department of Biostatistics, School of Public Health, University of Washington, Seattle, WA USA
| | - Struan F A Grant
- 10Divisions of Human Genetics and Endocrinology, Children's Hospital of Philadelphia Research Institute, Philadelphia, PA USA
| | - Christopher Haiman
- 11Department of Preventive Medicine, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA USA
| | - Ruth J F Loos
- 12Charles R. Bronfman Instituted for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY USA
| | - Kari E North
- 1Department of Epidemiology, UNC Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 123 W Franklin St, Building C, Chapel Hill, NC USA
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Ebrahimi-Mameghani M, Asghari-Jafarabadi M, Rezazadeh K. TCF7L2-rs7903146 polymorphism modulates the effect of artichoke leaf extract supplementation on insulin resistance in metabolic syndrome: a randomized, double-blind, placebo-controlled trial. Journal of Integrative Medicine 2018; 16:329-334. [DOI: 10.1016/j.joim.2018.05.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Accepted: 05/06/2018] [Indexed: 01/13/2023]
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Miranda-Lora AL, Cruz M, Molina-Díaz M, Gutiérrez J, Flores-Huerta S, Klünder-Klünder M. Associations of common variants in the SLC16A11, TCF7L2, and ABCA1 genes with pediatric-onset type 2 diabetes and related glycemic traits in families: A case-control and case-parent trio study. Pediatr Diabetes 2017; 18:824-831. [PMID: PMID: 28101933 DOI: 10.1111/pedi.12497] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 12/14/2016] [Accepted: 12/15/2016] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND There is evidence of associations of single-nucleotide polymorphisms (SNPs) with type 2 diabetes (T2D) and related glycemic traits in adults, but there is a little information about such associations in youths. OBJECTIVE The aim of this study was to evaluate the associations of SNPs in the TCF7L2, SLC16A11, and ABCA1 genes with T2D and related glycemic traits in Mexican children and adolescents. SUBJECTS A total of 99 families with children with T2D (n = 327) and 83 families with children without the disease (n = 212). METHODS The associations between SNPs of TCF7L2 (rs7903146 and rs12255372), SLC16A11 (rs13342232), and ABCA1 (rs9282541) with T2D were analyzed. We also evaluated the effects of SNPs on quantitatively related glycemic traits after adjusting for age, sex, and the presence of overweight or obesity. RESULTS The G allele of SLC16A1 /rs13342232 was associated with T2D in adults (adjusted odds ratio [ORadj] = 1.89; 95% confidence interval [CI]: 1.18; 3.06) and children (ORadj = 1.94; 95% CI: 1.25; 3.00). In addition, the combined analysis of case-control and case-parent trio was also significant (OR = 1.43; 95% CI: 1.12; 1.74). After adjusting for known confounding factors, we found a significant association between TCF7L2/rs122555372 and C-peptide (β = -0.76, P = .005) in patients with diabetes and between fasting glucose (β = 2.05, P = .039) and homeostatic model assessment of β-cell function (β = -32.14, P = .025) levels in individuals without diabetes. CONCLUSIONS The results suggest that SLC16A1 /rs13342232 might be involved in the risk of pediatric-onset T2D in Mexican families. Moreover, TCF7L2/rs122555372 was associated with pancreatic reserve in patients with T2D and with fasting glucose and β-cell function in individuals without diabetes.
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Affiliation(s)
- América L Miranda-Lora
- Research Unit of Medicine Based on Evidence, Hospital Infantil de México Federico Gómez, Mexico City, Mexico
| | - Miguel Cruz
- Medical Research Unit in Biochemistry, Hospital de Especialidades Centro Médico Nacional SXXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Mario Molina-Díaz
- Department of Endocrinology, Hospital Infantil de México Federico Gómez, Mexico City, Mexico
| | - Jorge Gutiérrez
- Medical Research Unit in Biochemistry, Hospital de Especialidades Centro Médico Nacional SXXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Samuel Flores-Huerta
- Department of Community Health Research, Hospital Infantil de México Federico Gómez, Mexico City, Mexico
| | - Miguel Klünder-Klünder
- Department of Community Health Research, Hospital Infantil de México Federico Gómez, Mexico City, Mexico
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Rezazadeh K, Rahmati-Yamchi M, Mohammadnejad L, Ebrahimi-Mameghani M, Delazar A. Effects of artichoke leaf extract supplementation on metabolic parameters in women with metabolic syndrome: Influence of TCF7L2-rs7903146 and FTO-rs9939609 polymorphisms. Phytother Res 2017; 32:84-93. [DOI: 10.1002/ptr.5951] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 08/25/2017] [Accepted: 09/05/2017] [Indexed: 12/12/2022]
Affiliation(s)
- Khatereh Rezazadeh
- Talented Students Center, Student Research Committee, School of Nutrition and Food Sciences; Tabriz University of Medical Sciences; Tabriz Iran
| | | | - Leila Mohammadnejad
- Immunology Research Center; Tabriz University of Medical Sciences; Tabriz Iran
| | - Mehrangiz Ebrahimi-Mameghani
- Nutrition Research Center, School of Nutrition and Food Sciences; Tabriz University of Medical Sciences; Tabriz Iran
| | - Abbas Delazar
- Department of Pharmacognosy, School of Pharmacy; Tabriz University of Medical Sciences; Tabriz Iran
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García-Chapa EG, Leal-Ugarte E, Peralta-Leal V, Durán-González J, Meza-Espinoza JP. Genetic Epidemiology of Type 2 Diabetes in Mexican Mestizos. Biomed Res Int 2017; 2017:3937893. [PMID: 28607931 DOI: 10.1155/2017/3937893] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 04/18/2017] [Indexed: 12/31/2022]
Abstract
There are currently about 415 million people with diabetes worldwide, a figure likely to increase to 642 million by 2040. In 2015, Mexico was the second Latin American country and sixth in the world in prevalence of this disorder with nearly 11.5 million of patients. Type 2 diabetes (T2D) is the main kind of diabetes and its etiology is complex with environmental and genetic factors involved. Indeed, polymorphisms in several genes have been associated with this disease worldwide. To estimate the genetic epidemiology of T2D in Mexican mestizos a systematic bibliographic search of published articles through PubMed, Scopus, Google Scholar, and Web of Science was conducted. Just case-control studies of candidate genes about T2D in Mexican mestizo inhabitants were included. Nineteen studies that met the inclusion criteria were found. In total, 68 polymorphisms of 41 genes were assessed; 26 of them were associated with T2D risk, which were located in ABCA1, ADRB3, CAPN10, CDC123/CAMK1D, CDKAL1, CDKN2A/2B, CRP, ELMO1, FTO, HHEX, IGF2BP2, IRS1, JAZF1, KCNQ1, LOC387761, LTA, NXPH1, SIRT1, SLC30A8, TCF7L2, and TNF-α genes. Overall, 21 of the 41 analyzed genes were associated with T2D in Mexican mestizos. Such a genetic heterogeneity compares with findings in other ethnic groups.
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Gallardo-Blanco HL, Villarreal-Perez JZ, Cerda-Flores RM, Figueroa A, Sanchez-Dominguez CN, Gutierrez-Valverde JM, Torres-Muñoz IC, Lavalle-Gonzalez FJ, Gallegos-Cabriales EC, Martinez-Garza LE. Genetic variants in KCNJ11, TCF7L2 and HNF4A are associated with type 2 diabetes, BMI and dyslipidemia in families of Northeastern Mexico: A pilot study. Exp Ther Med 2016; 13:523-529. [PMID: 28352326 PMCID: PMC5348709 DOI: 10.3892/etm.2016.3990] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 01/20/2016] [Indexed: 12/19/2022] Open
Abstract
The aim of the present study was to investigate whether genetic markers considered risk factors for metabolic syndromes, including dyslipidemia, obesity and type 2 diabetes mellitus (T2DM), can be applied to a Northeastern Mexican population. A total of 37 families were analyzed for 63 single nucleotide polymorphisms (SNPs), and the age, body mass index (BMI), glucose tolerance values and blood lipid levels, including those of cholesterol, low-density lipoprotein (LDL), very LDL (VLDL), high-density lipoprotein (HDL) and triglycerides were evaluated. Three genetic markers previously associated with metabolic syndromes were identified in the sample population, including KCNJ11, TCF7L2 and HNF4A. The KCNJ11 SNP rs5210 was associated with T2DM, the TCF7L2 SNP rs11196175 was associated with BMI and cholesterol and LDL levels, the TCF7L2 SNP rs12255372 was associated with BMI and HDL, VLDL and triglyceride levels, and the HNF4A SNP rs1885088 was associated with LDL levels (P<0.05).
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Affiliation(s)
- Hugo Leonid Gallardo-Blanco
- Department of Genetics, School of Medicine, Autonomous University of Nuevo León, Monterrey, Nuevo León, CP 64460, Mexico
| | - Jesus Zacarías Villarreal-Perez
- Department of Endocrinology, University Hospital 'José Eleuterio González', Autonomous University of Nuevo León, Monterrey, Nuevo León, CP 64460, Mexico
| | | | - Andres Figueroa
- Department of Computer Science, University of Texas Rio Grande Valley, TX 78539, USA
| | - Celia Nohemi Sanchez-Dominguez
- Department of Biochemistry and Molecular Medicine, School of Medicine, Autonomous University of Nuevo León, Monterrey, Nuevo León, CP 64460, Mexico
| | | | - Iris Carmen Torres-Muñoz
- Department of Genetics, School of Medicine, Autonomous University of Nuevo León, Monterrey, Nuevo León, CP 64460, Mexico
| | - Fernando Javier Lavalle-Gonzalez
- Department of Endocrinology, University Hospital 'José Eleuterio González', Autonomous University of Nuevo León, Monterrey, Nuevo León, CP 64460, Mexico
| | | | - Laura Elia Martinez-Garza
- Department of Genetics, School of Medicine, Autonomous University of Nuevo León, Monterrey, Nuevo León, CP 64460, Mexico
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Sánchez-Pozos K, Menjívar M. Genetic Component of Type 2 Diabetes in a Mexican Population. Arch Med Res 2016; 47:496-505. [DOI: 10.1016/j.arcmed.2016.12.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 12/05/2016] [Indexed: 01/15/2023]
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López-Ortiz MM, Garay-Sevilla ME, Tejero ME, Perez-Luque EL. Analysis of the interaction between transcription factor 7-like 2 genetic variants with nopal and wholegrain fibre intake: effects on anthropometric and metabolic characteristics in type 2 diabetes patients. Br J Nutr 2016; 116:969-78. [PMID: 27480250 DOI: 10.1017/S0007114516002798] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The transcription factor 7-like 2 (TCF7L2) genetic variants have shown differential effect on low-fat and high-fat diet in obese subjects. Nopal is a Mexican variety of cactus that is a traditional food and has been used in the treatment of diabetes. Its hypoglycaemic effect may be because of its soluble fibre (mucopolysaccharide) content. This study analysed the effects of the rs7903146 and rs12255372 TCF7L2 variants on anthropometric, metabolic and hormonal parameters in type 2 diabetes mellitus patients who consumed fibre from either nopal tortilla or wholegrain bread for 8 weeks. We followed-up seventy-four patients who consumed an individualised isoenergetic diet that included nopal tortilla (Diet 1) and sixty-three patients with a diet that included wholegrain bread (Diet 2). Anthropometric, metabolic and hormonal measures were collected at baseline and final intervention. The size effect and carry-over effect were estimated. To assess the interaction of genotype and diets, we used a general linear model repeated-measures analysis. Minor allele frequency of rs7903146T was 0·27 and for rs12255372T it was 0·13. At 8 weeks after Diet 1 intake, weight, BMI, waist and hip circumference decreased (P=0·00015) in rs7903146CC and rs12255372GG genotypes. In particular, patients carrying of the rs7903146CC and consuming Diet 1 showed a reduction in waist circumference of more than 2·5 cm compared with Diet 2 (P<0·001). No significant interaction between rs7903146 or rs12255372 and diet was seen in this study. In conclusion, in the carriers of the rs7903146CC and rs12255372GG wild types, significant changes in all anthropometric measures were observed, and had better response to both diets.
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Salinas YD, Wang L, DeWan AT. Multiethnic genome-wide association study identifies ethnic-specific associations with body mass index in Hispanics and African Americans. BMC Genet 2016; 17:78. [PMID: 27296613 PMCID: PMC4907283 DOI: 10.1186/s12863-016-0387-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 06/01/2016] [Indexed: 01/03/2023] Open
Abstract
Background Genome-wide association studies of obesity have typically assumed fixed genetic effects across ethnicities, rarely attempting to thoroughly compare and contrast findings across various ethnic groups. Therefore, our study aimed to identify novel genetic associations with body mass index (BMI), a common measure of obesity, and explore their cross-ethnic generalizability in a multiethnic population. To that end, we conducted ethnic-specific genome-wide association analyses among 1235 Hispanic, 706 Asian, 1549 African American, and 2395 European American subjects from the Multi-ethnic Study of Atherosclerosis (MESA). We compared findings across ethnicities and investigated single-nucleotide polymorphisms (SNPs) with suggestive BMI-association p-values among 3379 Hispanic and 6871 African American subjects from the Women’s Health Initiative (WHI). Results We identified a genome-wide significant association in MESA Hispanics—rs12253976 in KLF6 (beta = 5.792 kg/m2 per-allele, 95 % confidence interval (CI): 3.885, 7.698; p = 3.43 × 10−9)—and suggestive SNPs with p < 5 × 10−6 in MESA Hispanics, European Americans and African Americans that display ethnic-specific effects on BMI. Of these suggestive SNPs, Hispanic SNP rs12255372 and African American SNP rs6435678 had the most evidence of replication in WHI. rs12255372 (in TCF7L2) was associated with lower BMI in both MESA (beta = −1.111 kg/m2, 95 % CI: −1.578, −0.645; p = 3.33 × 10−6) and WHI Hispanics (beta = −0.304 kg/m2, 95 % CI: −0.613, 0.006; p = 0.054). This TCF7L2 intronic region contains several SNPs (rs7901695, rs4506565, rs4132670, and rs12243326) with low p-values (p < 10−3) in MESA and betas of similar magnitude and direction in MESA and WHI, but only rs12243326 is in strong linkage disequilibrium with rs12255372 in our Hispanic populations, suggesting independent signals in this region. rs6435678 (in ERBB4) was associated with greater BMI in both MESA (beta = 1.104 kg/m2, 95 % CI: 0.643, 1.564; p = 2.85 × 10−6) and WHI African Americans (beta = 0.219 kg/m2, 95 % CI: −0.021, 0.460; p = 0.074). Conclusions Two BMI-association signals are present in the TCF7L2 intronic region of Hispanics, one of which is tagged by rs12255372. ERBB4 rs6435678 is a novel BMI-association signal in African Americans. Overall, our data suggest that ethnic-specific associations are involved in the genetic determination of BMI. Ethnic-specificity has potential implications for the development of gene-based therapies for obesity. Electronic supplementary material The online version of this article (doi:10.1186/s12863-016-0387-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yasmmyn D Salinas
- Department of Chronic Disease Epidemiology, Yale School of Public Health, 60 College Street, New Haven, CT, 06520, USA
| | - Leyao Wang
- Department of Chronic Disease Epidemiology, Yale School of Public Health, 60 College Street, New Haven, CT, 06520, USA
| | - Andrew T DeWan
- Department of Chronic Disease Epidemiology, Yale School of Public Health, 60 College Street, New Haven, CT, 06520, USA.
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Rezaei M, Palizban A, Zamani-doabi S, Shojaee M. Transcription factor 7-like 2 (TCF7L2) Gene Polymorphism rs7903146 is Associated with Lipid Profile and Risk of Cardiovascular Disease in Metabolic Syndrome Subjects. ACTA ACUST UNITED AC 2016. [DOI: 10.15412/j.jbtw.01050703] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Badaruddoza B, Barna B, Matharoo K, Bhanwer AJS. A case-control association study of K121Q (rs 1044498) and G/T (rs 1225572) variants in ENPP1 and TCF7L2 genes with type 2 diabetes mellitus in north Indian Punjabi population. Int J Diabetes Dev Ctries 2015; 35:546-553. [DOI: 10.1007/s13410-015-0337-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/06/2022] Open
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Allahdini M, Kamalidehghan B, Akbari L, Azadfar P, Rahmani A, Ahmadipour F, Meng GY, Masserrat A, Houshmand M. Prevalence of the rs7903146C>T polymorphism in TCF7L2 gene for prediction of type 2 diabetes risk among Iranians of different ethnicities. Drug Des Devel Ther 2015; 9:5835-41. [PMID: 26604685 PMCID: PMC4629960 DOI: 10.2147/dddt.s82485] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Background Pharmacogenetics is the study of genetic polymorphisms affecting responses to drug therapy. The common rs7903146 (C>T) polymorphism of the TCF7L2 gene has recently been associated with type 2 diabetes (T2D). In this study, prevalence of the rs7903146 (C>T) polymorphism in the TCF7L2 gene for prediction of T2D risk was examined in an Iranian population of different ethnicities. Methods The prevalence of rs7903146 (C>T) and the predicted phenotypes, including extensive metabolizers, intermediate metabolizers, and poor metabolizers were investigated in blood samples of 300 unrelated healthy individuals in an Iranian population, including Fars, Turk, Lure, and Kurd, using polymerase chain reaction restriction fragment length polymorphism and direct genomic DNA sequencing. Results The homozygous wild-type (C/C), heterozygous (C/T), and homozygous (T/T) allelic frequencies of rs7903146 (C>T) in the TCF7L2 gene were 29% (extensive metabolizers), 66.34% (intermediate metabolizers), and 4.66% (poor metabolizers), respectively. The C/C, C/T, and T/T genotypic frequencies of the rs7903146 (C>T) allele were significantly different (P<0.01) among Iranians of different ethnicities. The frequency of the homozygous T/T variant of the rs7903146 (C>T) allele was significantly low in the Lure (P<0.01) and high in the Fars (P<0.001) ethnicities. Additionally, the frequency of the T/T variant of the rs7903146 (C>T) allele in the South of Iran was the highest (P<0.04), while the East of Iran had the lowest frequency (P<0.01). Conclusion The prediction of rs7903146 (C>T) is required in drug research and routine treatment, where the information would be helpful for clinicians to optimize therapy and adverse drug reactions and predict drug response in individuals at risk of T2D.
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Affiliation(s)
- Mojgan Allahdini
- Department of Molecular Biology, Ahar Branch Islamic Azad University, Ahar, Iran
| | - Behnam Kamalidehghan
- Pharmacy Department, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Leila Akbari
- Department of Biology, Sciences and Research Branch, Azad University, Tehran, Iran
| | - Parisa Azadfar
- Department of Biology, Sciences and Research Branch, Azad University, Tehran, Iran
| | - Ali Rahmani
- Department of Molecular Biology, Ahar Branch Islamic Azad University, Ahar, Iran
| | - Fatemeh Ahmadipour
- Pharmacy Department, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Goh Yong Meng
- Department of Veterinary Preclinical Sciences, Faculty of Veterinary Medicine, Universiti Putra Malaysia, Serdang, Malaysia
| | | | - Massoud Houshmand
- Department of Medical Genetics, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
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Moran Y, Labrador L, Camargo ME, Fernández D, Chiurillo MA. Design of an allele-specific PCR assay to genotype the rs12255372 SNP in a pilot study of association between common TCF7L2 polymorphisms and type 2 diabetes in Venezuelans. Arch Endocrinol Metab 2015; 60:246-51. [PMID: 26201011 PMCID: PMC10522308 DOI: 10.1590/2359-3997000000064] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 05/05/2015] [Indexed: 11/22/2022]
Abstract
OBJECTIVE The global burden of diabetes mellitus will impact strongly American countries in the coming decades. Type 2 diabetes mellitus (T2DM) is a multifactorial disease and the basis for its genetic susceptibility remains not fully understood. Different population studies have demonstrated that variants of the TCF7L2 gene are strongly associated with an increased risk of T2DM. Moreover, institutions or countries with limited budget to conduct genetic research need cost effective methods for detecting DNA variants. SUBJECTS AND METHODS We standardized a rapid and simple allele-specific PCR method for genotyping the rs12255372 single nucleotide polymorphism (SNP) in a pilot study exploring the association of three TCF7L2 polymorphisms (rs7903146, rs12255372 and DG10S478) with T2DM in 70 patients and 73 controls from Venezuela. RESULTS The performance of the designed allele-specific PCR reaction for rs12255372 genotyping was reliable and accurate. Patients carrying the TCF7L2 rs7903146 T allele (CT + TT genotypes) and heterozygous CT genotype had a significantly higher risk for T2DM (OR = 2.9 and 2.3, respectively). Although rs12255372 and DG10S478 risk alleles predominated in T2DM group no statistical significance was found. CONCLUSIONS We developed a novel allele-specific PCR method for easier and rapid detection of rs12255372 polymorphism without the use of expensive instrumentation and reagents. Our study in a relatively small sample of the Venezuelan population replicated the association of the rs7903146 SNP with T2DM. Further studies with larger sample size and more biochemical data should be conducted to explore the genetic basis of T2DM susceptibility in Venezuela.
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Affiliation(s)
- Yeinmy Moran
- Laboratorio de Genética Molecular “Dr. Jorge Yunis-Turbay”Decanato de Ciencias de la SaludUniversidad Centroccidental Lisandro AlvaradoBarquisimetoVenezuelaLaboratorio de Genética Molecular “Dr. Jorge Yunis-Turbay”, Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto, Venezuela
- Departamento de Medicina InternaHospital Antonio María Pineda-UCLABarquisimetoVenezuelaDepartamento de Medicina Interna, Hospital Antonio María Pineda-UCLA, Barquisimeto, Venezuela
| | - Luis Labrador
- Laboratorio de Genética Molecular “Dr. Jorge Yunis-Turbay”Decanato de Ciencias de la SaludUniversidad Centroccidental Lisandro AlvaradoBarquisimetoVenezuelaLaboratorio de Genética Molecular “Dr. Jorge Yunis-Turbay”, Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto, Venezuela
| | - María Eugenia Camargo
- Laboratorio de Genética Molecular “Dr. Jorge Yunis-Turbay”Decanato de Ciencias de la SaludUniversidad Centroccidental Lisandro AlvaradoBarquisimetoVenezuelaLaboratorio de Genética Molecular “Dr. Jorge Yunis-Turbay”, Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto, Venezuela
| | - David Fernández
- Departamento de Medicina InternaHospital Antonio María Pineda-UCLABarquisimetoVenezuelaDepartamento de Medicina Interna, Hospital Antonio María Pineda-UCLA, Barquisimeto, Venezuela
| | - Miguel Angel Chiurillo
- Laboratorio de Genética Molecular “Dr. Jorge Yunis-Turbay”Decanato de Ciencias de la SaludUniversidad Centroccidental Lisandro AlvaradoBarquisimetoVenezuelaLaboratorio de Genética Molecular “Dr. Jorge Yunis-Turbay”, Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto, Venezuela
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Lara-Riegos JC, Ortiz-López MG, Peña-Espinoza BI, Montúfar-Robles I, Peña-Rico MA, Sánchez-Pozos K, Granados-Silvestre MA, Menjivar M. Diabetes susceptibility in Mayas: Evidence for the involvement of polymorphisms in HHEX, HNF4α, KCNJ11, PPARγ, CDKN2A/2B, SLC30A8, CDC123/CAMK1D, TCF7L2, ABCA1 and SLC16A11 genes. Gene 2015; 565:68-75. [PMID: 25839936 DOI: 10.1016/j.gene.2015.03.065] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 03/13/2015] [Accepted: 03/29/2015] [Indexed: 01/11/2023]
Abstract
Association of type 2 diabetes (T2D) with common variants in HHEX, HNF4α, KCNJ11, PPARγ, CDKN2A/2B, SLC30A8, CDC123/CAMK1D, TCF7L2, ABCA1 and SLC16A11 genes have been reported, mainly in populations of European and Asian ancestry and to a lesser extent in Latin Americans. Thus, we aimed to investigate the contribution of rs1111875 (HHEX), rs1800961 (HNF4α), rs5219 (KCNJ11), rs1801282 (PPARγ), rs10811661 (CDKN2A/2B), rs13266634 (SLC30A8), rs12779790 (CDC123/CAMK1D), rs7903146 (TCF7L2), rs9282541 (ABCA1) and rs13342692 (SLC16A11) polymorphisms in the genetic background of Maya population to associate their susceptibility to develop T2D. This is one of the first studies designed specifically to investigate the inherited component of T2D in the indigenous population of Mexico. SNPs were genotyped by allelic discrimination method in 575 unrelated Maya individuals. Two SNPs rs10811661 and rs928254 were significantly associated with T2D after adjusting for BMI; rs10811661 in a recessive and rs9282541 in a dominant model. Additionally, we found phenotypical alterations associated with genetic variants: HDL to rs9282541 and insulin to rs13342692. In conclusion, these findings support an association of genetic polymorphisms to develop T2D in Maya population.
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Affiliation(s)
- J C Lara-Riegos
- Unidad de Genómica de Poblaciones Aplicada a la Salud, Facultad de Química Universidad Nacional Autónoma de México - Instituto Nacional de Medicina Genómica, Mexico
| | - M G Ortiz-López
- Laboratory of Molecular Endocrinology, Hospital Juárez de México, Mexico
| | - B I Peña-Espinoza
- Unidad de Genómica de Poblaciones Aplicada a la Salud, Facultad de Química Universidad Nacional Autónoma de México - Instituto Nacional de Medicina Genómica, Mexico
| | - I Montúfar-Robles
- Laboratory of Molecular Endocrinology, Hospital Juárez de México, Mexico
| | - M A Peña-Rico
- Unidad de Genómica de Poblaciones Aplicada a la Salud, Facultad de Química Universidad Nacional Autónoma de México - Instituto Nacional de Medicina Genómica, Mexico
| | - K Sánchez-Pozos
- Unidad de Genómica de Poblaciones Aplicada a la Salud, Facultad de Química Universidad Nacional Autónoma de México - Instituto Nacional de Medicina Genómica, Mexico
| | - M A Granados-Silvestre
- Unidad de Genómica de Poblaciones Aplicada a la Salud, Facultad de Química Universidad Nacional Autónoma de México - Instituto Nacional de Medicina Genómica, Mexico
| | - M Menjivar
- Unidad de Genómica de Poblaciones Aplicada a la Salud, Facultad de Química Universidad Nacional Autónoma de México - Instituto Nacional de Medicina Genómica, Mexico.
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Reyes-López R, Pérez-Luque E, Malacara JM. Metabolic, hormonal characteristics and genetic variants of TCF7L2 associated with development of gestational diabetes mellitus in Mexican women. Diabetes Metab Res Rev 2014; 30:701-6. [PMID: 24639413 DOI: 10.1002/dmrr.2538] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 02/06/2014] [Accepted: 03/03/2014] [Indexed: 12/31/2022]
Abstract
BACKGROUND Variation in TCF7L2 gene is associated with type 2 diabetes and with gestational diabetes mellitus in several populations, but there are no data in Mexican women with gestational diabetes mellitus. In this study, we examined metabolic and hormonal measurements as well as TCF7L2 genetic variants. METHODS We selected 108 pregnant women with normal glucose tolerance and 90 with gestational diabetes mellitus according to 2010 American Diabetes Association criteria matched for gestational week. We collected data on blood pressure, body mass index (BMI) and concentrations of blood glucose, HbA1c , lipids profile, insulin and glucagon-like peptide-1 (GLP-1). The genotyping of rs7903146 and rs12255372 polymorphisms were made with polymerase chain reaction-restriction fragment length polymorphism. RESULTS Actual and pre-gestational BMI, fasting glucose and HbA1c were higher (p < 0.001), and high-density lipoprotein cholesterol was lower (p < 0.02) in gestational diabetes mellitus women than euglycemic women. No significant differences were found for lipids, insulin and homeostasis model assessment-insulin resistance. Gestational diabetes mellitus women had high GLP-1 levels (32 vs 24, p < 0.004) and decreased β-cell function (266 vs 438, p < 0.001). The frequency of rs12255372 risk allele in gestational diabetes women was significantly higher than that in euglycemic women (χ² = 8.96; p < 0.003) and confers a risk for gestational diabetes mellitus (OR = 9.1, 95% CI 2.8-29, p < 0.0002; and OR = 4.3, 95% CI 1.6-11.4, p < 0.003 based on dominant and co-dominant model, respectively). The generalized linear model showed that low beta function, high pre-gestational BMI and rs12255372 risk allele are independently associated with gestational diabetes. CONCLUSIONS The elevated GLP-1 levels in gestational diabetes women suggested some abnormality in insulin secretion. The low β-cell function, high pre-gestational BMI and rs12255372 risk allele are risk factors independently associated with the development of gestational diabetes.
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Affiliation(s)
- Ruth Reyes-López
- Departamento de Ciencias Médicas, División Ciencias de la Salud, Universidad de Guanajuato, 20 de Enero 929, Colonia Obregón, León, Guanajuato, 37320, Mexico
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Tsai MK, Wang HM, Shiang JC, Chen IH, Wang CC, Shiao YF, Liu WS, Lin TJ, Chen TM, Chen YH. Sequence variants of ADIPOQ and association with type 2 diabetes mellitus in Taiwan Chinese Han population. ScientificWorldJournal 2014; 2014:650393. [PMID: 25121131 DOI: 10.1155/2014/650393] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 06/04/2014] [Accepted: 06/16/2014] [Indexed: 01/18/2023] Open
Abstract
Diabetes is a serious global health problem. Large-scale genome-wide association studies identified loci for type 2 diabetes mellitus (T2DM), including adiponectin (ADIPOQ) gene and transcription factor 7-like 2 (TCF7L2), but few studies clarified the effect of genetic polymorphisms of ADIPOQ and TCF7L2 on risk of T2DM. We attempted to elucidate association between T2DM and polymorphic variations of both in Taiwan's Chinese Han population, with our retrospective case-control study genotyping single nucleotide polymorphisms (SNPs) in ADIPOQ and TCF7L2 genes both in 149 T2DM patients and in 139 healthy controls from Taiwan. Statistical analysis gauged association of these polymorphisms with risk of T2DM to show ADIPOQ rs1501299 polymorphism variations strongly correlated with T2DM risk (P = 0.042), with rs2241766 polymorphism being not associated with T2DM (P = 0.967). However, both polymorphisms rs7903146 and rs12255372 of TCF7L2 were rarely detected in Taiwanese people. This study avers that ADIPOQ rs1501299 polymorphism contributes to risk of T2DM in the Taiwanese population.
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Karnes JH, Gong Y, Pacanowski MA, McDonough CW, Arwood MJ, Langaee TY, Pepine CJ, Johnson JA, Cooper-Dehoff RM. Impact of TCF7L2 single nucleotide polymorphisms on hydrochlorothiazide-induced diabetes. Pharmacogenet Genomics 2013; 23:697-705. [PMID: 24128935 DOI: 10.1097/FPC.0000000000000012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
OBJECTIVE Thiazide diuretics have been associated with increased risk for new onset diabetes (NOD), but pharmacogenetic markers of thiazide-induced NOD are not well studied. Single nucleotide polymorphisms (SNPs) in the transcription factor 7-like 2 gene (TCF7L2) represent the strongest and most reproducible genetic associations with diabetes. We investigated the association of tag SNPs in TCF7L2 with thiazide-induced NOD. METHODS We identified cases that developed NOD and age, sex, and race/ethnicity-matched controls from the INternational VErapamil SR-Trandolapril STudy (INVEST). INVEST compared cardiovascular outcomes between two antihypertensive treatment strategies in ethnically diverse patients with hypertension and coronary artery disease. We genotyped 101 TCF7L2 tag SNPs and used logistic regression to test for pharmacogenetic (SNP×hydrochlorothiazide treatment) interactions. Permuted interaction P values were corrected with the PACT test and adjusted for diabetes-related variables. RESULTS In INVEST whites, we observed three TCF7L2 SNPs with significant SNP×treatment interactions for NOD. The strongest pharmacogenetic interaction was observed for rs7917983 [synergy index 3.37 (95% CI 1.72-6.59), P=5.0×10, PACT=0.03], which was associated with increased NOD risk in hydrochlorothiazide-treated patients [odds ratio 1.53 (1.04-2.25), P=0.03] and decreased NOD risk in non hydrochlorothiazide-treated patients [odds ratio 0.48 (0.27-0.86), P=0.02]. The TCF7L2 SNP rs4506565, previously associated with diabetes, showed a similar, significant pharmacogenetic association. CONCLUSION Our results suggest that hydrochlorothiazide treatment is an environmental risk factor that increases diabetes risk beyond that attributed to TCF7L2 variation in white, hypertensive patients. Further study and replication of our results is needed to confirm pharmacogenetic influences of TCF7L2 SNPs on thiazide-induced NOD.
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Wang J, Zhang J, Li L, Wang Y, Wang Q, Zhai Y, You H, Hu D. Association of rs12255372 in the TCF7L2 gene with type 2 diabetes mellitus: a meta-analysis. Braz J Med Biol Res 2013; 46:382-93. [PMID: 23579632 PMCID: PMC3854403 DOI: 10.1590/1414-431x20132677] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Accepted: 01/25/2013] [Indexed: 12/21/2022] Open
Abstract
Our objective was to evaluate the association of rs12255372 in the
TCF7L2 gene with type 2 diabetes mellitus (T2DM) in the world
population. We carried out a survey of the literature about the effect of rs12255372
on genetic susceptibility to T2DM by consulting PubMed, the Cochrane Library, and
Embase from 2006 to 2012, and then performed a meta-analysis of all the studies in
order to evaluate the association between rs12255372 and T2DM. A total of 33 articles
including 42 studies (with 34,076 cases and 36,192 controls) were confirmed to be
eligible and were included in the final meta-analysis: 6 studies conducted on
Europeans, 14 on Caucasians, 17 on Asians, 2 on Africans, and 3 on Americans.
Overall, the effect size was as follows: for the variant allele T (OR = 1.387, 95%CI
= 1.351-1.424), for the TT genotype (OR = 1.933, 95%CI = 1.815-2.057), for the GT
genotype (OR = 1.363, 95%CI = 1.315-1.413), for the dominant model (OR = 1.425, 95%CI
= 1.344-1.510), and for the recessive model (OR = 1.659, 95%CI = 1.563-1.761). In
summary, by pooling all available qualified data from genetic studies on rs12255372
and T2DM, we have confirmed that rs12255372 is significantly associated with
susceptibility to T2DM in the global population.
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Affiliation(s)
- Jinjin Wang
- Discipline of Public Health and Preventive Medicine, Center of Preventive Medicine Research and Assessment, Henan University of Traditional Chinese Medicine, Zhengzhou, China
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Gamboa-Meléndez MA, Huerta-Chagoya A, Moreno-Macías H, Vázquez-Cárdenas P, Ordóñez-Sánchez ML, Rodríguez-Guillén R, Riba L, Rodríguez-Torres M, Guerra-García MT, Guillén-Pineda LE, Choudhry S, del Bosque-Plata L, Canizales-Quinteros S, Pérez-Ortiz G, Escobedo-Aguirre F, Parra A, Lerman-Garber I, Aguilar-Salinas CA, Tusié-Luna MT. Contribution of common genetic variation to the risk of type 2 diabetes in the Mexican Mestizo population. Diabetes 2012; 61:3314-21. [PMID: 22923468 PMCID: PMC3501881 DOI: 10.2337/db11-0550] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Several studies have identified nearly 40 different type 2 diabetes susceptibility loci, mainly in European populations, but few of them have been evaluated in the Mexican population. The aim of this study was to examine the extent to which 24 common genetic variants previously associated with type 2 diabetes are associated in Mexican Mestizos. Twenty-four single nucleotide polymorphisms (SNPs) in or near genes (KCNJ11, PPARG, TCF7L2, SLC30A8, HHEX, CDKN2A/2B, CDKAL1, IGF2BP2, ARHGEF11, JAZF1, CDC123/CAMK1D, FTO, TSPAN8/LGR5, KCNQ1, THADA, ADAMTS9, NOTCH2, NXPH1, RORA, UBQLNL, and RALGPS2) were genotyped in Mexican Mestizos. A case-control association study comprising 1,027 type 2 diabetic individuals and 990 control individuals was conducted. To account for population stratification, a panel of 104 ancestry-informative markers was analyzed. Association to type 2 diabetes was found for rs13266634 (SLC30A8), rs7923837 (HHEX), rs10811661 (CDKN2A/2B), rs4402960 (IGF2BP2), rs12779790 (CDC123/CAMK1D), and rs2237892 (KCNQ1). In addition, rs7754840 (CDKAL1) was associated in the nonobese type 2 diabetic subgroup, and for rs7903146 (TCF7L2), association was observed for early-onset type 2 diabetes. Lack of association for the rest of the variants may have resulted from insufficient power to detect smaller allele effects.
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Affiliation(s)
- Marco Alberto Gamboa-Meléndez
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Alicia Huerta-Chagoya
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Hortensia Moreno-Macías
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
- División de Ciencias Sociales y Humanidades, Departamento de Economía, Universidad Autónoma Metropolitana Iztapalapa, Mexico City, Mexico
| | - Paola Vázquez-Cárdenas
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - María Luisa Ordóñez-Sánchez
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Rosario Rodríguez-Guillén
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Laura Riba
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Maribel Rodríguez-Torres
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - María Teresa Guerra-García
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Luz Elizabeth Guillén-Pineda
- Departamento de Endocrinología y Metabolismo de Lípidos, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Shweta Choudhry
- Department of Urology and Institute for Human Genetics, University of California, San Francisco, San Francisco, California
| | | | - Samuel Canizales-Quinteros
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Gustavo Pérez-Ortiz
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Fernando Escobedo-Aguirre
- Unidad Materno Fetal, Hospital 20 de Noviembre, Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, Mexico City, Mexico
| | - Adalberto Parra
- Departamento de Endocrinología, Instituto Nacional de Perinatología Isidro Espinoza de los Reyes, Mexico City, Mexico
| | - Israel Lerman-Garber
- Departamento de Endocrinología y Metabolismo de Lípidos, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Carlos Alberto Aguilar-Salinas
- Departamento de Endocrinología y Metabolismo de Lípidos, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
- Corresponding authors: María Teresa Tusié-Luna, , and Carlos Alberto Aguilar-Salinas,
| | - María Teresa Tusié-Luna
- Unidad de Biología Molecular y Medicina Genómica, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
- Corresponding authors: María Teresa Tusié-Luna, , and Carlos Alberto Aguilar-Salinas,
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Peng S, Zhu Y, Lü B, Xu F, Li X, Lai M. TCF7L2 gene polymorphisms and type 2 diabetes risk: a comprehensive and updated meta-analysis involving 121,174 subjects. Mutagenesis 2012. [PMID: 23188737 DOI: 10.1093/mutage/ges048] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Recently, many new loci associated with type 2 diabetes have been uncovered by genetic association studies and genome-wide association studies. As more reports are made, particularly with respect to varying ethnicities, there is a need to determine more precisely the effect sizes in each major racial group. In addition, some reports have claimed ethnic-specific associations with alternative single-nucleotide polymorphisms (SNPs), and to that end there has been a degree of confusion. We conducted a meta-analysis using an additive genetic model. Eight polymorphisms in 155 studies with 121174 subjects (53385 cases and 67789 controls) were addressed in this meta-analysis. Significant associations were found between type 2 diabetes and rs7903146, rs12255372, rs11196205, rs7901695, rs7895340 and rs4506565, with summary odds ratios (ORs) (95% confidence interval) of 1.39 (1.34-1.45), 1.33 (1.27-1.40), 1.20 (1.14-1.26), 1.32 (1.25-1.39), 1.21 (1.13-1.29) and 1.39 (1.29-1.49), respectively. In addition, no significant associations were found between the two polymorphisms (rs290487 and rs11196218) and type 2 diabetes. The summary ORs for the six statistically significant associations (P < 0.05) were further evaluated by estimating the false-positive report probability, with results indicating that all of the six significant associations were considered noteworthy, and may plausibly be true associations. Significant associations were found between the six polymorphisms (rs7903146, rs12255372, rs11196205, rs7901695, rs7895340 and rs4506565) in the TCF7L2 gene and type 2 diabetes risk, and the other two polymorphisms (rs11196218 and rs290487) were not found to be significantly associated with type 2 diabetes. Subgroups analyses show that significant associations are not found between the six SNPs (rs7903146, rs12255372, rs11196205, rs7901695, rs7895340, and rs4506565) and the type 2 diabetes in some ethnic populations.
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Affiliation(s)
- Sihua Peng
- Department of Pathology, Zhejiang University School of Medicine, Hangzhou 310058, PR China
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Turki A, Al-Zaben GS, Mtiraoui N, Marmmuoch H, Mahjoub T, Almawi WY. Transcription factor-7-like 2 gene variants are strongly associated with type 2 diabetes in Tunisian Arab subjects. Gene 2012; 513:244-8. [PMID: 23142382 DOI: 10.1016/j.gene.2012.10.086] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2012] [Revised: 10/10/2012] [Accepted: 10/26/2012] [Indexed: 12/11/2022]
Abstract
Genome-wide association studies validated transcription factor 7-like 2 (TCF7L2) gene as confirmed type 2 diabetes (T2DM) susceptibility locus, and an ethnic contribution of TCF7L2 variants to T2DM risk was indicated. The aim of this study was to replicate in a Tunisian Arab population identified associations of common TCF7L2 variants with T2DM. We tested the association of TCF7L2 variants: rs4506565, rs7903146, rs12243326, and rs12255372, with T2DM in 900 Tunisian patients and 875 control subjects. TCF7L2 genotyping was done by allelic discrimination/real-time PCR method. Minor allele frequencies of rs4506565 (P=2.4×10(-8)), rs7903146 (P=1.2×10(-6)), rs12243326 (P=8.4×10(-8)) and rs12255372 (P=1.1×10(-5)) were significantly higher in cases. The four tested TCF7L2 variants were in linkage disequilibrium, and 4-locus (rs4506565, rs7903146, rs12243326, rs12255372) haplotype analysis demonstrated that haplotype 1111 was negatively associated (Pc<0.001), while haplotypes 2222 (Pc=0.008) and 2211 (Pc=0.020) were positively associated with T2DM risk, after controlling for a number of covariates. The strong contribution of TCF7L2 gene variants to T2DM among Tunisians is in line with similar findings in other ethnic groups, confirming TCF7L2 as a common T2DM candidate gene.
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Affiliation(s)
- Amira Turki
- Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia
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Klünder-Klünder M, Mejía-Benitez MA, Flores-Huerta S, Burguete-García AI, García-Mena J, Cruz M. rs12255372 variant of TCF7L2 gene is protective for obesity in Mexican children. Arch Med Res 2012; 42:495-501. [PMID: 22136959 DOI: 10.1016/j.arcmed.2011.05.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Accepted: 05/12/2011] [Indexed: 11/17/2022]
Abstract
BACKGROUND AND AIMS Variants in the transcription factor 7-like 2 (TCF7L2) gene are consistently associated with type 2 diabetes in adults, but the association of TCF7L2 with weight-related traits and body fat in humans is unclear. The aim of this study was to determine the relationship between the TCF7L2 gene (rs12255372) and obese phenotype in Mexican school-age children. METHODS The study was performed in schools in Mexico City; 186 obese and 194 control children were studied. Fasting insulin and glucose, total cholesterol, LDL-C, HDL-C and triglycerides concentration were determined. The variant rs12255372 of the TCF7L2 gene was genotyped. We used age- and sex-adjusted linear models to test for association with metabolic measurements with this variant. RESULTS Genotype of the TCF7L2 rs12255372 gene was associated with lower fasting plasma glucose (p = 0.001) and lower homeostasis model assessment of insulin resistance (HOMA-R; p = 0.001) in nonobese children. Heterozygous carriers for this variant were more prevalent in lean children (32.5%) than in the obese group (23.7%), which resulted in a strong protective effect for the normal weight condition (OR = 0.56, 0.32-0.97). CONCLUSIONS TCF7L2 rs12255372 polymorphism protects Mexican children from obesity. Further research in other large, population-based studies is needed to replicate these findings.
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Affiliation(s)
- Miguel Klünder-Klünder
- Community Health Research Department, Hospital Infantil de México Federico Gómez, Ministry of Health, Mexico City, Mexico
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Leite TKM, Fonseca RMC, de França NM, Parra EJ, Pereira RW. Genomic ancestry, self-reported "color" and quantitative measures of skin pigmentation in Brazilian admixed siblings. PLoS One 2011; 6:e27162. [PMID: 22073278 PMCID: PMC3206941 DOI: 10.1371/journal.pone.0027162] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Accepted: 10/11/2011] [Indexed: 01/03/2023] Open
Abstract
A current concern in genetic epidemiology studies in admixed populations is that population stratification can lead to spurious results. The Brazilian census classifies individuals according to self-reported “color”, but several studies have demonstrated that stratifying according to “color” is not a useful strategy to control for population structure, due to the dissociation between self-reported “color” and genomic ancestry. We report the results of a study in a group of Brazilian siblings in which we measured skin pigmentation using a reflectometer, and estimated genomic ancestry using 21 Ancestry Informative Markers (AIMs). Self-reported “color”, according to the Brazilian census, was also available for each participant. This made it possible to evaluate the relationship between self-reported “color” and skin pigmentation, self-reported “color” and genomic ancestry, and skin pigmentation and genomic ancestry. We observed that, although there were significant differences between the three “color” groups in genomic ancestry and skin pigmentation, there was considerable dispersion within each group and substantial overlap between groups. We also saw that there was no good agreement between the “color” categories reported by each member of the sibling pair: 30 out of 86 sibling pairs reported different “color”, and in some cases, the sibling reporting the darker “color” category had lighter skin pigmentation. Socioeconomic status was significantly associated with self-reported “color” and genomic ancestry in this sample. This and other studies show that subjective classifications based on self-reported “color”, such as the one that is used in the Brazilian census, are inadequate to describe the population structure present in recently admixed populations. Finally, we observed that one of the AIMs included in the panel (rs1426654), which is located in the known pigmentation gene SLC24A5, was strongly associated with skin pigmentation in this sample.
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Affiliation(s)
- Tailce K. M. Leite
- Programa de Pós-Graduação em Educação Física, Universidade Católica de Brasília, Brasília, Distrito Federal, Brazil
| | - Rômulo M. C. Fonseca
- Programa de Pós-Graduação em Educação Física, Universidade Católica de Brasília, Brasília, Distrito Federal, Brazil
| | - Nanci M. de França
- Programa de Pós-Graduação em Educação Física, Universidade Católica de Brasília, Brasília, Distrito Federal, Brazil
| | - Esteban J. Parra
- Department of Anthropology, University of Toronto at Mississauga, Mississauga, Ontario, Canada
| | - Rinaldo W. Pereira
- Programa de Pós-Graduação em Educação Física, Universidade Católica de Brasília, Brasília, Distrito Federal, Brazil
- Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, Distrito Federal, Brazil
- * E-mail:
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Martínez-Gómez LE, Cruz M, Martínez-Nava GA, Madrid-Marina V, Parra E, García-Mena J, Espinoza-Rojo M, Estrada-Velasco BI, Piza-Roman LF, Aguilera P, Burguete-García AI. A replication study of the IRS1, CAPN10, TCF7L2, and PPARG gene polymorphisms associated with type 2 diabetes in two different populations of Mexico. Ann Hum Genet 2011; 75:612-20. [PMID: 21834909 DOI: 10.1111/j.1469-1809.2011.00668.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Type 2 diabetes (T2D) is a chronic degenerative disease that involves the participation of several genetic and environmental factors. The objective of the study was to determine the association of the IRS1 (rs1801278), CAPN10 (rs3792267), TCF7L2 (rs7903146 and rs12255372), and PPARG (rs1801282) gene polymorphisms with T2D, in two different Mexican populations. We conducted a case-control replication study in the state of Guerrero and in Mexico City, with 400 subjects from Guerrero and 1065 from Mexico City. Data were analyzed by logistic regression, adjusting by ancestry, age, gender, and BMI, to determine the association with T2D. Heterozygosity for the Gly972Arg variant of the IRS1 gene showed the strongest association for T2D in both analyzed samples (OR = 2.43, 95% CI 1.12-5.26 and 2.64, 95% CI 1.37-5.10, respectively). In addition, an association of two SNPs of the TCF7L2 gene with T2D was observed in both cities: rs7903146, (for Guerrero OR = 1.98 CI95% 1.02-3.89 and for Mexico OR = 1.94 CI95% 1.31-2.88) and rs12255372 (OR = 1.79 CI95% 1.08-2.97, OR = 1.78 CI95% 1.17-2.71 respectively). We suggest that our results provide strong evidence that variation in the IRS1 and TCF7L2 genes confers susceptibility to T2D in our studied populations.
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Affiliation(s)
- Laura E Martínez-Gómez
- Centro de Investigación Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, México
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Guinan KJ. Worldwide distribution of type II diabetes-associated TCF7L2 SNPs: evidence for stratification in Europe. Biochem Genet 2011; 50:159-79. [PMID: 21898192 DOI: 10.1007/s10528-011-9456-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 05/12/2011] [Indexed: 12/24/2022]
Abstract
Type II diabetes is a multifactorial disease with a complex etiology. Numerous genes have been implicated in disease pathogenesis. In particular, SNPs at the TCF7L2 locus have consistently shown strong associations with type II diabetes. This study characterizes the global distribution of type II diabetes-associated TCF7L2 SNPs utilizing HapMap, HGDP-CEPH, and Alfred databases and the literature. High frequencies of rs7903146(T), rs12255372(T), and rs7901695(C) SNPs are observed in Africa, Europe, and the Middle East, but they are reduced and almost absent in Southeast Asian and Native American populations. In contrast, rs11196218(A) has the highest frequency in Eurasia but is reduced in sub-Saharan African and Native American populations. Regional variations in rs7903146(T) follow a gradient of decreasing frequency from southern into northeastern Europe. These findings demonstrate extensive global and regional variations in the frequencies of TCF7L2 SNPs, which may contribute to differences in the incidence of type II diabetes worldwide.
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Palizban A, Nikpour M, Salehi R, Maracy MR. Association of a common variant in TCF7L2 gene with type 2 diabetes mellitus in a Persian population. Clin Exp Med 2012; 12:115-9. [PMID: 21678030 DOI: 10.1007/s10238-011-0144-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Accepted: 05/31/2011] [Indexed: 01/22/2023]
Abstract
Diabetes is one of the most common and challenging health problems. Studies in several nations show that polymorphisms within the transcription factor 7-like 2 genes could be associated with type 2 diabetes (T2D). Therefore, a case-control study was conducted to find the association between SNP rs7903146 and T2D in our population. The study consists of 110 patients referring to clinic and 80 healthy controls randomly selected based on WHO guideline. DNA was extracted from blood and genotyped by PCR-RFLP with specific primers to amplify a fragment for restriction enzyme (RsaI). A chi-square test was calculated to compare the proportions of genotypes or alleles. Using a logistic regression model, the odds ratio for risk of developing T2D was calculated with and without adjustment for age, sex, and BMI. The frequency of the T allele of rs7903146 (C/T) polymorphism was significantly higher in diabetic subjects (47.3%) compared to that in normal subjects (34.4%). Logistic regression analysis of the rs7903146 polymorphism showed that the odds ratio was 3.71(95% CI: 1.43-9.56; P: 0.008) for the TT genotype and 1.26 (95% CI: 0.67-2.39; P: 0.516) for the CT genotype when compared with the CC genotype. Odds ratio adjusted for age, sex, and BMI have shown similar results. The results show that rs7903146 of TCF7L2 gene is an important susceptibility gene for T2D mellitus in the province of Isfahan, Iran. Our results support the recent findings that rs7903146 of TCF7L2 gene is an important genetic risk factor for the development of T2D in multiple ethnic groups.
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Ereqat S, Nasereddin A, Cauchi S, Azmi K, Abdeen Z, Amin R. Association of a common variant in TCF7L2 gene with type 2 diabetes mellitus in the Palestinian population. Acta Diabetol 2010; 47 Suppl 1:195-8. [PMID: 19885641 DOI: 10.1007/s00592-009-0161-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Accepted: 09/30/2009] [Indexed: 02/06/2023]
Abstract
Recent genome-wide association studies have provided an important resource for furthering our understanding of type 2 diabetes mellitus (T2DM) disease mechanisms. Most of these T2DM gene loci affect insulin secretion. We examined the association of rs7903146 variant in the transcription factor 7 like 2 gene (TCF7L2) with T2DM in 333 Palestinian subjects (219 were type 2 diabetic patients and 114 normoglycemic subjects). The rs7903146 variant of TCF7L2 significantly increased T2DM risk with an allelic odds ratio of 3.34 (95% CI [1.99-5.60], P < 0.0001). No significant association was observed between TCF7L2 genotypes and covariates of age, gender and BMI or any tested metabolic trait (total cholesterol and fasting plasma glucose) in both diabetic and nondiabetic individuals (P > 0.05). Among the diabetic group, the TT genotype carrier have earlier age at diagnosis compared with CC and CT carriers (P = 0.013). This is the first study conducted on this gene in the Palestinian population and provides valuable information for comparison with other ethnic groups.
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Affiliation(s)
- Suheir Ereqat
- Department of Biochemistry and Molecular Biology, Medical School, Al-Quds University, Jerusalem, Palestine
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Cruz M, Valladares-Salgado A, Garcia-Mena J, Ross K, Edwards M, Angeles-Martinez J, Ortega-Camarillo C, de la Peña JE, Burguete-Garcia AI, Wacher-Rodarte N, Ambriz R, Rivera R, D'artote AL, Peralta J, Parra EJ, Kumate J. Candidate gene association study conditioning on individual ancestry in patients with type 2 diabetes and metabolic syndrome from Mexico City. Diabetes Metab Res Rev 2010; 26:261-70. [PMID: 20503258 DOI: 10.1002/dmrr.1082] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND Type 2 diabetes (T2D) is influenced by diverse environmental and genetic risk factors. Metabolic syndrome (MS) increases the risk of cardiovascular disease and diabetes. We analysed 14 cases of polymorphisms located in 10 candidate loci, in a sample of patients with T2D and controls from Mexico City. METHODS We analysed the association of 14 polymorphisms located within 10 genes (TCF7L2, ENPP1, ADRB3, KCNJ11, LEPR, PPARgamma, FTO, CDKAL1, SIRT1 and HHEX) with T2D and MS. The analysis included 519 subjects with T2D defined according to the ADA criteria, 389 with MS defined according to the AHA/NHLBI criteria and 547 controls. Association was tested with the program ADMIXMAP including individual ancestry, age, sex, education and in some cases body mass index (BMI), in a logistic regression model. RESULTS The two markers located within the TCF7L2 gene showed strong associations with T2D (rs7903146, T allele, odd ratio (OR) = 1.76, p = 0.001 and rs12255372, T allele, OR = 1.78, p = 0.002), but did not show significant association with MS. The non-synonymous rs4994 polymorphism of the ADRB3 gene was associated with T2D (Trp allele, OR = 0.62, p = 0.001) and MS (Trp allele, OR = 0.74, p = 0.018). Nominally significant associations were also observed between T2D and the SIRT1 rs3758391 SNP and MS and the HHEX rs5015480 polymorphism. CONCLUSIONS Variants located within the gene TCF7L2 are strongly associated with T2D but not with MS, providing support to previous evidence indicating that polymorphisms at the TCF7L2 gene increase T2D risk. In contrast, the non-synonymous ADRB3 rs4994 polymorphism is associated with T2D and MS.
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Affiliation(s)
- M Cruz
- Unidad de Investigacion Medica en Bioquimica, Hospital de Especialidades, Instituto Mexicano del Seguro Social, CMN Siglo XXI, Mexico, DF, Mexico.
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Abstract
Type 2 diabetes mellitus is a complex metabolic disease that is caused by insulin resistance and beta-cell dysfunction. Furthermore, type 2 diabetes has an evident genetic component and represents a polygenic disease. During the last decade, considerable progress was made in the identification of type 2 diabetes risk genes. This was crucially influenced by the development of affordable high-density single nucleotide polymorphism (SNP) arrays that prompted several successful genome-wide association scans in large case-control cohorts. Subsequent to the identification of type 2 diabetes risk SNPs, cohorts thoroughly phenotyped for prediabetic traits with elaborate in vivo methods allowed an initial characterization of the pathomechanisms of these SNPs. Although the underlying molecular mechanisms are still incompletely understood, a surprising result of these pathomechanistic investigations was that most of the risk SNPs affect beta-cell function. This favors a beta-cell-centric view on the genetics of type 2 diabetes. The aim of this review is to summarize the current knowledge about the type 2 diabetes risk genes and their variants' pathomechanisms.
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Affiliation(s)
- Harald Staiger
- Department of Internal Medicine, Division of Endocrinology, Diabetology, Angiology, Nephrology, and Clinical Chemistry, University Hospital Tübingen, D-72076 Tübingen, Germany
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Tong Y, Lin Y, Zhang Y, Yang J, Zhang Y, Liu H, Zhang B. Association between TCF7L2 gene polymorphisms and susceptibility to type 2 diabetes mellitus: a large Human Genome Epidemiology (HuGE) review and meta-analysis. BMC Med Genet 2009. [PMID: 19228405 DOI: 10.1186/1471-2350-10-15.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
BACKGROUND Transcription factor 7-like 2 (TCF7L2) has been shown to be associated with type 2 diabetes mellitus (T2MD) in multiple ethnic groups in the past two years, but, contradictory results were reported for Chinese and Pima Indian populations. The authors then performed a large meta-analysis of 36 studies examining the association of type 2 diabetes mellitus (T2DM) with polymorphisms in the TCF7L2 gene in various ethnicities, containing rs7903146 C-to-T (IVS3C>T), rs7901695 T-to-C (IVS3T>C), a rs12255372 G-to-T (IVS4G>T), and rs11196205 G-to-C (IVS4G>C) polymorphisms and to evaluate the size of gene effect and the possible genetic mode of action. METHODS Literature-based searching was conducted to collect data and three methods, that is, fixed-effects, random-effects and Bayesian multivariate mete-analysis, were performed to pool the odds ratio (OR). Publication bias and study-between heterogeneity were also examined. RESULTS The studies included 35,843 cases of T2DM and 39,123 controls, using mainly primary data. For T2DM and IVS3C>T polymorphism, the Bayesian OR for TT homozygotes and TC heterozygotes versus CC homozygote was 1.968 (95% credible interval (CrI): 1.790, 2.157), 1.406 (95% CrI: 1.341, 1.476), respectively, and the population attributable risk (PAR) for the TT/TC genotypes of this variant is 16.9% for overall. For T2DM and IVS4G>T polymorphism, TT homozygotes and TG heterozygotes versus GG homozygote was 1.885 (95%CrI: 1.698, 2.088), 1.360 (95% CrI: 1.291, 1.433), respectively. Four ORs among these two polymorphisms all yielded significant between-study heterogeneity (P < 0.05) and the main source of heterogeneity was ethnic differences. Data also showed significant associations between T2DM and the other two polymorphisms, but with low heterogeneity (P > 0.10). Pooled ORs fit a codominant, multiplicative genetic model for all the four polymorphisms of TCF7L2 gene, and this model was also confirmed in different ethnic populations when stratification of IVS3C>T and IVS4G>T polymorphisms except for Africans, where a dominant, additive genetic mode is suggested for IVS3C>T polymorphism. CONCLUSION This meta-analysis demonstrates that four variants of TCF7L2 gene are all associated with T2DM, and indicates a multiplicative genetic model for all the four polymorphisms, as well as suggests the TCF7L2 gene involved in near 1/5 of all T2MD. Potential gene-gene and gene-environmental interactions by which common variants in the TCF7L2 gene influence the risk of T2MD need further exploration.
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Affiliation(s)
- Yu Tong
- Open laboratory, West China Second University Hospital, Sichuan University, Chengdu, PR China.
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Tong Y, Lin Y, Zhang Y, Yang J, Zhang Y, Liu H, Zhang B. Association between TCF7L2 gene polymorphisms and susceptibility to type 2 diabetes mellitus: a large Human Genome Epidemiology (HuGE) review and meta-analysis. BMC Med Genet 2009; 10:15. [PMID: 19228405 PMCID: PMC2653476 DOI: 10.1186/1471-2350-10-15] [Citation(s) in RCA: 164] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2008] [Accepted: 02/19/2009] [Indexed: 02/08/2023]
Abstract
Background Transcription factor 7-like 2 (TCF7L2) has been shown to be associated with type 2 diabetes mellitus (T2MD) in multiple ethnic groups in the past two years, but, contradictory results were reported for Chinese and Pima Indian populations. The authors then performed a large meta-analysis of 36 studies examining the association of type 2 diabetes mellitus (T2DM) with polymorphisms in the TCF7L2 gene in various ethnicities, containing rs7903146 C-to-T (IVS3C>T), rs7901695 T-to-C (IVS3T>C), a rs12255372 G-to-T (IVS4G>T), and rs11196205 G-to-C (IVS4G>C) polymorphisms and to evaluate the size of gene effect and the possible genetic mode of action. Methods Literature-based searching was conducted to collect data and three methods, that is, fixed-effects, random-effects and Bayesian multivariate mete-analysis, were performed to pool the odds ratio (OR). Publication bias and study-between heterogeneity were also examined. Results The studies included 35,843 cases of T2DM and 39,123 controls, using mainly primary data. For T2DM and IVS3C>T polymorphism, the Bayesian OR for TT homozygotes and TC heterozygotes versus CC homozygote was 1.968 (95% credible interval (CrI): 1.790, 2.157), 1.406 (95% CrI: 1.341, 1.476), respectively, and the population attributable risk (PAR) for the TT/TC genotypes of this variant is 16.9% for overall. For T2DM and IVS4G>T polymorphism, TT homozygotes and TG heterozygotes versus GG homozygote was 1.885 (95%CrI: 1.698, 2.088), 1.360 (95% CrI: 1.291, 1.433), respectively. Four ORs among these two polymorphisms all yielded significant between-study heterogeneity (P < 0.05) and the main source of heterogeneity was ethnic differences. Data also showed significant associations between T2DM and the other two polymorphisms, but with low heterogeneity (P > 0.10). Pooled ORs fit a codominant, multiplicative genetic model for all the four polymorphisms of TCF7L2 gene, and this model was also confirmed in different ethnic populations when stratification of IVS3C>T and IVS4G>T polymorphisms except for Africans, where a dominant, additive genetic mode is suggested for IVS3C>T polymorphism. Conclusion This meta-analysis demonstrates that four variants of TCF7L2 gene are all associated with T2DM, and indicates a multiplicative genetic model for all the four polymorphisms, as well as suggests the TCF7L2 gene involved in near 1/5 of all T2MD. Potential gene-gene and gene-environmental interactions by which common variants in the TCF7L2 gene influence the risk of T2MD need further exploration.
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Affiliation(s)
- Yu Tong
- Open laboratory, West China Second University Hospital, Sichuan University, Chengdu, PR China.
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Gulcher J, Stefansson K. The clinical utility of genetic risk variants in type 2 diabetes. Expert Opin Med Diagn 2008; 2:991-1002. [PMID: 23495871 DOI: 10.1517/17530059.2.8.991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Type 2 diabetes is one of the first success stories in the application of genome-wide linkage and association studies to find genetic variants contributing to its risk. OBJECTIVE Are the genetic markers found so far useful in predicting which individuals are more likely to develop type 2 diabetes? Can they find which patients with prediabetes are more likely to convert to type 2 diabetes and therefore may benefit the most from lifestyle or pharmacologic prevention strategies? METHODS The literature pertaining to the discovery and replications of genes contributing to type 2 diabetes was focused on. RESULTS/CONCLUSION Substantial risk for type 2 diabetes is represented by the top 8 genes, including TCF7L2, and in certain circumstances may be useful for prevention strategies targeted to those with highest risk.
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Affiliation(s)
- Jeff Gulcher
- Decode Genetics, Inc., Sturlugata 8, 101 Reykjavik, Iceland
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Laramie JM, Wilk JB, Williamson SL, Nagle MW, Latourelle JC, Tobin JE, Province MA, Borecki IB, Myers RH. Polymorphisms near EXOC4 and LRGUK on chromosome 7q32 are associated with Type 2 Diabetes and fasting glucose; the NHLBI Family Heart Study. BMC Med Genet 2008; 9:46. [PMID: 18498660 PMCID: PMC2409301 DOI: 10.1186/1471-2350-9-46] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2008] [Accepted: 05/22/2008] [Indexed: 12/04/2022]
Abstract
Background The chromosome 7q32 region is linked to metabolic syndrome and obesity related traits in the Family Heart Study. As part of a fine mapping study of the region, we evaluated the relationship of polymorphisms to fasting glucose levels and Type 2 diabetes. Methods Thirty-nine HapMap defined tag SNPs in a 1.08 Mb region and a novel deletion polymorphism were genotyped in 2,603 participants of the NHLBI Family Heart Study (FHS). Regression modeling, adjusting for BMI, age, sex, smoking and the TCF7L2 polymorphism, was used to evaluate the association of these polymorphisms with T2D and fasting glucoses levels. Results The deletion polymorphism confers a protective effect for T2D, with homozygous deletion carriers having a 53% reduced risk compared to non-deleted carriers. Among non-diabetics, the deletion was significantly associated with lower fasting glucose levels in men (p = 0.038) but not women (p = 0.118). In addition, seven SNPs near the deletion were significantly associated (p < 0.01) to diabetes. Conclusion Chromosome 7q32 contains both SNPs and a deletion that were associated to T2D. Although the deletion region contains several islands of strongly conserved sequence, it is not known to contain a transcribed gene. The closest nearby gene, EXOC4, is involved in insulin-stimulated glucose transport and may be a candidate for this association. Further work is needed to determine if the deletion represents a functional variant or may be in linkage disequilibrium with a functional mutation influencing EXOC4 or another nearby gene.
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Affiliation(s)
- Jason M Laramie
- Department of Neurology, Boston University School of Medicine, Boston, MA, USA.
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Villarreal-Molina MT, Flores-Dorantes MT, Arellano-Campos O, Villalobos-Comparan M, Rodríguez-Cruz M, Miliar-García A, Huertas-Vazquez A, Menjivar M, Romero-Hidalgo S, Wacher NH, Tusie-Luna MT, Cruz M, Aguilar-Salinas CA, Canizales-Quinteros S. Association of the ATP-binding cassette transporter A1 R230C variant with early-onset type 2 diabetes in a Mexican population. Diabetes 2008; 57:509-13. [PMID: 18003760 DOI: 10.2337/db07-0484] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The ATP-binding cassette transporter A1 (ABCA1) R230C variant is associated with low HDL cholesterol levels, obesity, and the metabolic syndrome in Mexican-Mestizos. Because a pivotal role for ABCA1 in pancreatic beta-cell function was recently observed in the mouse model, we assessed the association of this variant with type 2 diabetes in this population. RESEARCH DESIGN AND METHODS The initial group included 446 unrelated Mexican individuals: 244 with type 2 diabetes aged 20-69 years (121 with onset </=45 years), and 202 nondiabetic control subjects aged >50 years. An independent study group included 242 type 2 diabetic case subjects and 225 control subjects with similar characteristics. RESULTS R230C/C230C genotypes were significantly more frequent in type 2 diabetic individuals (24.6%) than in control subjects (11.4%) in the initial study group (OR 2.501; P = 0.001). After stratifying by age at diagnosis, the association was significant only in the early-onset group (age at diagnosis </=45 years) (OR 3.776, P = 3.3 x 10(-6)). Both associations remained significant after adjusting for admixture (P = 0.0008 and P = 8.1 x 10(-6), respectively). Similar trends were observed in the independent study group, and the combined analysis of both populations showed a highly significant association of the R230C variant with type 2 diabetes, particularly with that of early onset (P = 7.6 x 10(-6) and 9.4 x 10(-8), respectively). CONCLUSIONS The R230C ABCA1 variant is associated with type 2 diabetes, particularly of early onset, in the Mexican-Mestizo population.
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Affiliation(s)
- M Teresa Villarreal-Molina
- Unidad de Biología Molecular y Medicina Genómica, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga #15 Colonia Sección 16, Tlalpan 14000, México D.F
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Huertas-Vazquez A, Plaisier C, Weissglas-Volkov D, Sinsheimer J, Canizales-Quinteros S, Cruz-Bautista I, Nikkola E, Herrera-Hernandez M, Davila-Cervantes A, Tusie-Luna T, Taskinen MR, Aguilar-Salinas C, Pajukanta P. TCF7L2 is associated with high serum triacylglycerol and differentially expressed in adipose tissue in families with familial combined hyperlipidaemia. Diabetologia 2008; 51:62-9. [PMID: 17972059 DOI: 10.1007/s00125-007-0850-6] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2007] [Accepted: 09/19/2007] [Indexed: 10/22/2022]
Abstract
AIMS/HYPOTHESIS Common DNA variants of the transcription factor 7-like 2 gene (TCF7L2) are associated with type 2 diabetes. Familial combined hyperlipidaemia (FCHL) is characterised by hypertriacylglycerolaemia, hypercholesterolaemia, or both. Additionally, disturbances in glucose metabolism are commonly seen in FCHL. Therefore, we hypothesised that TCF7L2 may contribute to the genetic susceptibility for this common dyslipidaemia. METHODS We investigated the effect of the TCF7L2 variants, rs7903146 and rs12255372, on FCHL and its component traits triacylglycerol (TG), total cholesterol (TC) and apolipoprotein B (ApoB) in 759 individuals from 55 Mexican families. As a replication sample, 719 individuals from 60 Finnish FCHL families were analysed. We also used quantitative RT-PCR to evaluate the transcript levels of TCF7L2 in 47 subcutaneous fat biopsies from unrelated Mexican FCHL and normolipidaemic participants. RESULTS Significant evidence for association was observed for high TG for the T alleles of rs7903146 and rs12255372 (p = 0.005 and p = 0.01) in Mexican FCHL families. No evidence for association was observed for FCHL, TC, ApoB or glucose in Mexicans. When testing rs7903146 and rs12255372 for replication in Finnish FCHL families, these single nucleotide polymorphisms were associated with TG (p = 0.01 and p = 0.007). Furthermore, we observed statistically significant decreases in the mRNA levels (p = 0.0002) of TCF7L2 in FCHL- and TG-affected individuals. TCF7L2 expression was not altered by the SNP genotypes. CONCLUSIONS/INTERPRETATION These data show that rs7903146 and rs12255372 are significantly associated with high TG in FCHL families from two different populations. In addition, significantly decreased expression of TCF7L2 was observed in TG- and FCHL-affected individuals.
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Affiliation(s)
- A Huertas-Vazquez
- Department of Human Genetics, David Geffen School of Medicine at UCLA, University of California, Los Angeles, CA, USA
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