1
|
Fernandes Silva L, Vangipurapu J, Smith U, Laakso M. Metabolite Signature of Albuminuria Involves Amino Acid Pathways in 8661 Finnish Men Without Diabetes. J Clin Endocrinol Metab 2021; 106:143-152. [PMID: 32992327 PMCID: PMC7765644 DOI: 10.1210/clinem/dgaa661] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 09/28/2020] [Indexed: 12/29/2022]
Abstract
OBJECTIVE To investigate the metabolite signature of albuminuria in individuals without diabetes or chronic kidney disease to identify possible mechanisms that result in increased albuminuria and elevated risk of type 2 diabetes (T2D). RESEARCH DESIGN AND METHODS The study cohort was a population-based Metabolic Syndrome In Men (METSIM) study including 8861 middle-aged and elderly Finnish men without diabetes or chronic kidney disease at baseline. A total of 5504 men participated in a 7.5-year follow-up study, and 5181 of them had metabolomics data measured by Metabolon's ultrahigh performance liquid chromatography-tandem mass spectroscopy. RESULTS We found 32 metabolites significantly (P < 5.8 × 10-5) and positively associated with the urinary albumin excretion (UAE) rate. These metabolites were especially downstream metabolites in the amino acid metabolism pathways (threonine, phenylalanine, leucine, arginine). In our 7.5-year follow-up study, UAE was significantly associated with a 19% increase (hazard ratio 1.19; 95% confidence interval, 1.13-1.25) in the risk of T2D after the adjustment for confounding factors. Conversion to diabetes was more strongly associated with a decrease in insulin secretion than a decrease in insulin sensitivity. CONCLUSIONS Metabolic signature of UAE included multiple metabolites, especially from the amino acid metabolism pathways known to be associated with low-grade inflammation, and accumulation of reactive oxygen species that play an important role in the pathogenesis of UAE. These metabolites were primarily associated with an increase in UAE and were secondarily associated with a decrease in insulin secretion and insulin sensitivity, resulting in an increased risk of incident T2D.
Collapse
Affiliation(s)
- Lilian Fernandes Silva
- Institute of Clinical Medicine, Internal Medicine, University of Eastern Finland, Kuopio, Finland
| | - Jagadish Vangipurapu
- Institute of Clinical Medicine, Internal Medicine, University of Eastern Finland, Kuopio, Finland
| | - Ulf Smith
- Lundberg Laboratory for Diabetes Research, Department of Molecular and Clinical Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Markku Laakso
- Institute of Clinical Medicine, Internal Medicine, University of Eastern Finland, Kuopio, Finland
- Kuopio University Hospital, Kuopio, Finland
| |
Collapse
|
2
|
CDKAL1 (rs10946398) and TCF7L2 (rs7903146) gene polymorphisms and their association with risk of type-2 diabetes mellitus in population of Uttarakhand, India. Meta Gene 2020. [DOI: 10.1016/j.mgene.2020.100767] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
|
3
|
Bahaaeldin AM, Seif AA, Hamed AI, Kabiel WAY. Transcription Factor 7-Like-2 (<b><i>TCF7L2</i></b>) rs7903146 (C/T) Polymorphism in Patients with Type 2 Diabetes Mellitus. DUBAI DIABETES AND ENDOCRINOLOGY JOURNAL 2020. [DOI: 10.1159/000509756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
<b><i>Introduction:</i></b> Type 2 diabetes mellitus (T2DM) is a metabolic disorder characterized by the incapability of pancreas to increase insulin secretion to compensate for insulin resistance in the peripheral tissues. T2DM is a multifactorial disease including several environmental factors with the presence of genetic predisposition. The transcription factor 7-like-2 gene (<i>TCF7L2</i>) rs7903146 (C/T) polymorphism is one of the most susceptible genes to T2DM discovered to date, with contribution to the disease through the Wnt/β-catenin signaling pathway affecting pancreatic islet development, expression of several genes involved in insulin granules exocytosis, and the incretin glucagon-like peptide 1 (<i>GLP-1</i>) gene. Then, <i>TCF7L2</i> gene seems to affect diabetes susceptibility through B-cell dysfunction that is why we studied its association with T2DM in particular. <b><i>Objectives:</i></b> To investigate the potential association of the transcription factor 7-like-2 (<i>TCF7L2</i>) rs7903146 (C/T) gene polymorphism in patients with T2DM. <b><i>Methods:</i></b> A case-control study conducted on 70 T2DM patients recruited from the endocrinology clinic at Ain Shams University Hospitals, and 30 non-diabetic healthy controls age- and sex-matched with the patients. All subjects underwent full history taking; thorough clinical examination; routine laboratory investigations including hemoglobin A1c, total cholesterol, triglycerides, high-density lipoprotein-cholesterol, and low-density lipoprotein-cholesterol; and determination of <i>TCF7L2</i> gene polymorphism by qRT-PCR. <b><i>Results:</i></b> The minor T allele of the rs7903146(C/T) SNP was associated with high risk of development of T2DM with an OR of 1.35 (95% CI: 0.68–2.6) and the heterozygous genotype (CT) with an OR 1.16 (95% CI: 0.49–2.7); however, they were statistically insignificant (<i>p</i> value >0.05). <b><i>Conclusion:</i></b> Our study did not confirm the presence of significant association between the <i>TCF7L2</i> rs7903146(C/T) polymorphism and T2DM; however, it pointed out the possibility of presence of high risk of development of T2DM in patients with TT genotype. Further studies with higher sample size are needed to clarify the association.
Collapse
|
4
|
Foley KP, Zlitni S, Duggan BM, Barra NG, Anhê FF, Cavallari JF, Henriksbo BD, Chen CY, Huang M, Lau TC, Plante R, Schwab M, Marette A, Schertzer JD. Gut microbiota impairs insulin clearance in obese mice. Mol Metab 2020; 42:101067. [PMID: 32860984 PMCID: PMC7522491 DOI: 10.1016/j.molmet.2020.101067] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 08/20/2020] [Accepted: 08/20/2020] [Indexed: 02/06/2023] Open
Abstract
Objective Hyperinsulinemia can be both a cause and consequence of obesity and insulin resistance. Hyperinsulinemia can result from increased insulin secretion and/or reduced insulin clearance. While many studies have focused on mechanisms triggering insulin secretion during obesity, the triggers for changes in insulin clearance during obesity are less defined. In this study, we investigated the role of the microbiota in regulating insulin clearance during diet-induced obesity. Methods Blood glucose and insulin clearance were tested in conventional male mice treated with antibiotics and germ-free mice colonized with microbes from mice that were fed a control (chow) diet or an obesogenic high-fat diet (HFD). The composition of the fecal microbiota was analyzed using 16S rRNA sequencing. Results Short-term HFD feeding and aging did not alter insulin clearance in the mice. Oral antibiotics mitigated impaired blood insulin clearance in the mice fed an HFD for 12 weeks or longer. Germ-free mice colonized with microbes from HFD-fed donor mice had impaired insulin but not C-peptide clearance. Microbe-transmissible insulin clearance impairment was only observed in germ-free mice after more than 6 weeks post-colonization upon HFD feeding. Five bacterial taxa predicted >90% of the variance in insulin clearance. Mechanistically, impaired insulin clearance was associated with lower levels of hepatic Ceacam-1 but increased liver and skeletal muscle insulin-degrading enzyme (IDE) activity. Conclusions Gut microbes regulate insulin clearance during diet-induced obesity. A small cluster of microbes or their metabolites may be targeted for mitigating defects in insulin clearance and hyperinsulinemia during the progression of obesity and type 2 diabetes. Obesity impairs insulin clearance in mice, which is mitigated by antibiotics. The gut microbiota contributes to impaired insulin but not C-peptide clearance. The gut microbiota is a stand-alone factor that impairs insulin clearance. A cluster of related bacteria predict >90% of the variance in insulin clearance. Impaired insulin clearance is associated with lower hepatic Ceacam-1.
Collapse
Affiliation(s)
- Kevin P Foley
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada
| | - Soumaya Zlitni
- Departments of Genetics and Medicine, Stanford University, Stanford, CA, 94305, USA
| | - Brittany M Duggan
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada
| | - Nicole G Barra
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada
| | - Fernando F Anhê
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada
| | - Joseph F Cavallari
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada
| | - Brandyn D Henriksbo
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada
| | - Cassandra Y Chen
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada
| | - Michael Huang
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada
| | - Trevor C Lau
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada
| | - Roxanne Plante
- Quebec Heart and Lung Institute Research Center, Faculty of Medicine, Laval University, Quebec City, Quebec, G1V 4G5, Canada
| | - Michael Schwab
- Quebec Heart and Lung Institute Research Center, Faculty of Medicine, Laval University, Quebec City, Quebec, G1V 4G5, Canada
| | - André Marette
- Quebec Heart and Lung Institute Research Center, Faculty of Medicine, Laval University, Quebec City, Quebec, G1V 4G5, Canada
| | - Jonathan D Schertzer
- Department of Biochemistry and Biomedical Sciences, Farncombe Family Digestive Health Research Institute McMaster University, Hamilton, Ontario, L8N 3Z5, Canada.
| |
Collapse
|
5
|
Mustafa S, Younus D. Association of TCF7L2 rs7903146 Polymorphism with the Risk of Type 2 Diabetes Mellitus (T2DM) Among Kurdish Population in Erbil Province, Iraq. Indian J Clin Biochem 2020; 36:312-318. [PMID: 34220006 DOI: 10.1007/s12291-020-00904-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 06/08/2020] [Indexed: 11/26/2022]
Abstract
The genetic predispositions responsible for developing type 2 diabetes mellitus (T2DM) in the Middle East are poorly understood. The rs7903146 single nucleotide polymorphism (SNP) located in transcription factor 7-like-2 (TCF7L2) gene has been recognized to have a vital role in the development of T2DM disorder. The current study is the first to have researched the possible association between TCF7L2 rs7903146 SNP and T2DM among Kurdish population in Kurdistan region of Iraq. The study included 212 participants, half of them were T2DM patients, and the other half were disease-free and normoglycemic controls. Genotyping was performed by using a high throughput cost and time effective tetra-primer amplification refractory mutation system-polymerase chain reaction (Tetra ARMS-PCR) assay. The rs7903146 genotypic frequencies for CC, CT and TT were 24.5%, 69.8%, and 5.7% in T2DM group respectively, and for the controls were 45.3%, 50.9%, and 3.8% respectively. The frequency of CT genotype was found significantly higher in the cases when compared to the controls (OR = 2.53, 95% CI 1.40-4.57, P value < 0.0019), which indicated that the genotype CT showed risk with diabetes. The T allele showed a high significant frequency in the patients compared to the controls (OR = 1.65, 95% CI 1.10-2.47, P value = 0.014). Our findings demonstrated that the T allele could be a risk factor for increasing the susceptibility of T2DM incidence among the Iraqi Kurdish population.
Collapse
Affiliation(s)
- Suhad Mustafa
- General Directorate for Scientific Research, Salahaddin University- Erbil, Erbil, Kurdistan Region Iraq
| | - Delan Younus
- General Directorate for Scientific Research, Salahaddin University- Erbil, Erbil, Kurdistan Region Iraq
| |
Collapse
|
6
|
Affiliation(s)
- W Dana Flanders
- From the Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, GA
| | - Michael D Garber
- From the Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA
| |
Collapse
|
7
|
Shalimova A, Fadieienko G, Kolesnikova O, Isayeva A, Zlatkina V, Nemtsova V, Prosolenko K, Psarova V, Kyrychenko N, Kochuieva M. The Role of Genetic Polymorphism in the Formation of Arterial Hypertension, Type 2 Diabetes and their Comorbidity. Curr Pharm Des 2019; 25:218-227. [PMID: 30868946 DOI: 10.2174/1381612825666190314124049] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 03/09/2019] [Indexed: 12/18/2022]
Abstract
BACKGROUND Hereditary component plays a significant role in the formation of insulin resistance (IR) - one of the pathogenetic links of arterial hypertension (AH) and type 2 diabetes mellitus (DM2). However, the genetic predisposition to IR can not be realized and does not manifest itself clinically in the absence of appropriate factors of the environment (excessive nutrition, low physical activity, etc.). OBJECTIVE The review summarizes the results of studies which describe the contribution of genetic polymorphism to the formation and progression of AH, DM2 and their comorbidity in various populations. RESULTS In many studies, it has been established that genetic polymorphism of candidate genes is influenced by the formation, course and complication of AH and DM2. According to research data, the modulating effect of polymorphism of some genetic markers of AH and DM2 on metabolism and hemodynamics has been established. The results of numerous studies have shown a higher frequency of occurrence of AH and DM2, as well as their more severe course with adverse genetic polymorphisms. At the same time, the role of genetic polymorphism in the formation of AH and DM2 differs in different populations. CONCLUSION Contradictory data on the influence of gene polymorphisms on the formation of AH and DM2 in different populations, as well as a small number of studies on the combined effects of several polymorphisms on the formation of comorbidity, determine the continuation of research in this direction.
Collapse
Affiliation(s)
- Anna Shalimova
- The Government Institution 'L.T. Malaya Therapy National Institute of the National Academy of Medical Sciences of Ukraine', Kharkiv, Ukraine.,Kharkiv National Medical University, Kharkiv, Ukraine
| | - Galyna Fadieienko
- The Government Institution 'L.T. Malaya Therapy National Institute of the National Academy of Medical Sciences of Ukraine', Kharkiv, Ukraine
| | - Olena Kolesnikova
- The Government Institution 'L.T. Malaya Therapy National Institute of the National Academy of Medical Sciences of Ukraine', Kharkiv, Ukraine
| | - Anna Isayeva
- The Government Institution 'L.T. Malaya Therapy National Institute of the National Academy of Medical Sciences of Ukraine', Kharkiv, Ukraine
| | - Vira Zlatkina
- Kharkiv National Medical University, Kharkiv, Ukraine
| | | | | | | | | | - Maryna Kochuieva
- Kharkiv Medical Academy of Postgraduate Education, Kharkiv, Ukraine
| |
Collapse
|
8
|
Abbasi A, Sahlqvist AS, Lotta L, Brosnan JM, Vollenweider P, Giabbanelli P, Nunez DJ, Waterworth D, Scott RA, Langenberg C, Wareham NJ. A Systematic Review of Biomarkers and Risk of Incident Type 2 Diabetes: An Overview of Epidemiological, Prediction and Aetiological Research Literature. PLoS One 2016; 11:e0163721. [PMID: 27788146 PMCID: PMC5082867 DOI: 10.1371/journal.pone.0163721] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 08/17/2016] [Indexed: 12/12/2022] Open
Abstract
Background Blood-based or urinary biomarkers may play a role in quantifying the future risk of type 2 diabetes (T2D) and in understanding possible aetiological pathways to disease. However, no systematic review has been conducted that has identified and provided an overview of available biomarkers for incident T2D. We aimed to systematically review the associations of biomarkers with risk of developing T2D and to highlight evidence gaps in the existing literature regarding the predictive and aetiological value of these biomarkers and to direct future research in this field. Methods and Findings We systematically searched PubMed MEDLINE (January 2000 until March 2015) and Embase (until January 2016) databases for observational studies of biomarkers and incident T2D according to the 2009 PRISMA guidelines. We also searched availability of meta-analyses, Mendelian randomisation and prediction research for the identified biomarkers. We reviewed 3910 titles (705 abstracts) and 164 full papers and included 139 papers from 69 cohort studies that described the prospective relationships between 167 blood-based or urinary biomarkers and incident T2D. Only 35 biomarkers were reported in large scale studies with more than 1000 T2D cases, and thus the evidence for association was inconclusive for the majority of biomarkers. Fourteen biomarkers have been investigated using Mendelian randomisation approaches. Only for one biomarker was there strong observational evidence of association and evidence from genetic association studies that was compatible with an underlying causal association. In additional search for T2D prediction, we found only half of biomarkers were examined with formal evidence of predictive value for a minority of these biomarkers. Most biomarkers did not enhance the strength of prediction, but the strongest evidence for prediction was for biomarkers that quantify measures of glycaemia. Conclusions This study presents an extensive review of the current state of the literature to inform the strategy for future interrogation of existing and newly described biomarkers for T2D. Many biomarkers have been reported to be associated with the risk of developing T2D. The evidence of their value in adding to understanding of causal pathways to disease is very limited so far. The utility of most biomarkers remains largely unknown in clinical prediction. Future research should focus on providing good genetic instruments across consortia for possible biomarkers in Mendelian randomisation, prioritising biomarkers for measurement in large-scale cohort studies and examining predictive utility of biomarkers for a given context.
Collapse
Affiliation(s)
- Ali Abbasi
- Medical Research Council (MRC) Epidemiology Unit, University of Cambridge School of Clinical, Cambridge, United Kingdom
- * E-mail: ,
| | - Anna-Stina Sahlqvist
- GlaxoSmithKline, R&D, Stevenage, United Kingdom, RTP NC, King of Prussia, PA, United States of America
| | - Luca Lotta
- Medical Research Council (MRC) Epidemiology Unit, University of Cambridge School of Clinical, Cambridge, United Kingdom
| | | | | | - Philippe Giabbanelli
- Medical Research Council (MRC) Epidemiology Unit, University of Cambridge School of Clinical, Cambridge, United Kingdom
| | - Derek J. Nunez
- GlaxoSmithKline, R&D, Stevenage, United Kingdom, RTP NC, King of Prussia, PA, United States of America
| | - Dawn Waterworth
- GlaxoSmithKline, R&D, Stevenage, United Kingdom, RTP NC, King of Prussia, PA, United States of America
| | - Robert A. Scott
- Medical Research Council (MRC) Epidemiology Unit, University of Cambridge School of Clinical, Cambridge, United Kingdom
| | - Claudia Langenberg
- Medical Research Council (MRC) Epidemiology Unit, University of Cambridge School of Clinical, Cambridge, United Kingdom
| | - Nicholas J. Wareham
- Medical Research Council (MRC) Epidemiology Unit, University of Cambridge School of Clinical, Cambridge, United Kingdom
| |
Collapse
|
9
|
Abbasi A. Mendelian randomization studies of biomarkers and type 2 diabetes. Endocr Connect 2015; 4:249-60. [PMID: 26446360 PMCID: PMC4654400 DOI: 10.1530/ec-15-0087] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 10/07/2015] [Indexed: 12/16/2022]
Abstract
Many biomarkers are associated with type 2 diabetes (T2D) risk in epidemiological observations. The aim of this study was to identify and summarize current evidence for causal effects of biomarkers on T2D. A systematic literature search in PubMed and EMBASE (until April 2015) was done to identify Mendelian randomization studies that examined potential causal effects of biomarkers on T2D. To replicate the findings of identified studies, data from two large-scale, genome-wide association studies (GWAS) were used: DIAbetes Genetics Replication And Meta-analysis (DIAGRAMv3) for T2D and the Meta-Analyses of Glucose and Insulin-related traits Consortium (MAGIC) for glycaemic traits. GWAS summary statistics were extracted for the same genetic variants (or proxy variants), which were used in the original Mendelian randomization studies. Of the 21 biomarkers (from 28 studies), ten have been reported to be causally associated with T2D in Mendelian randomization. Most biomarkers were investigated in a single cohort study or population. Of the ten biomarkers that were identified, nominally significant associations with T2D or glycaemic traits were reached for those genetic variants related to bilirubin, pro-B-type natriuretic peptide, delta-6 desaturase and dimethylglycine based on the summary data from DIAGRAMv3 or MAGIC. Several Mendelian randomization studies investigated the nature of associations of biomarkers with T2D. However, there were only a few biomarkers that may have causal effects on T2D. Further research is needed to broadly evaluate the causal effects of multiple biomarkers on T2D and glycaemic traits using data from large-scale cohorts or GWAS including many different genetic variants.
Collapse
Affiliation(s)
- Ali Abbasi
- MRC Epidemiology UnitUniversity of Cambridge School of Clinical Medicine, Institute of Metabolic Science, Cambridge Biomedical Campus, Addenbrooke's Hospital, Post Box 285, Cambridge CB2 0QQ, UKDepartment of Epidemiology and Department of Internal Medicine, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands MRC Epidemiology UnitUniversity of Cambridge School of Clinical Medicine, Institute of Metabolic Science, Cambridge Biomedical Campus, Addenbrooke's Hospital, Post Box 285, Cambridge CB2 0QQ, UKDepartment of Epidemiology and Department of Internal Medicine, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| |
Collapse
|
10
|
Ding Y, Hu Z, Yuan S, Xie P, Liu Q. Association between transcription factor 7-like 2 rs7903146 polymorphism and diabetic retinopathy in type 2 diabetes mellitus: A meta-analysis. Diab Vasc Dis Res 2015; 12:436-44. [PMID: 26316572 DOI: 10.1177/1479164115598274] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
As one of the vascular complications of type 2 diabetes mellitus, the incidence of diabetes retinopathy is greatly increasing worldwide. Both genetic and environmental factors are involved in the pathologies. A meta-analysis was conducted to assess the association between transcription factor 7-like 2 polymorphism (rs7903146) and type 2 diabetic retinopathy. Published literature from PubMed, Web of Science and China National Knowledge Infrastructure were retrieved. Pooled odds ratios with 95% confidence intervals were calculated to estimate the strength of the association. Eight studies including 6422 participants were included in the final meta-analysis. Our analysis provides substantial evidence that the rs7903146 variant is significantly associated with the risk of diabetic retinopathy in Caucasian populations while not in East Asian populations. The variant of rs7903146 appeared more likely to be a promising genetic biomarker of diabetic retinopathy in Caucasians.
Collapse
Affiliation(s)
- Yuzhi Ding
- The First Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Zizhong Hu
- The First Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Songtao Yuan
- The First Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Ping Xie
- The First Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Qinghuai Liu
- The First Affiliated Hospital, Nanjing Medical University, Nanjing, China
| |
Collapse
|
11
|
Assmann TS, Duarte GCK, Rheinheimer J, Cruz LA, Canani LH, Crispim D. The TCF7L2 rs7903146 (C/T) polymorphism is associated with risk to type 2 diabetes mellitus in Southern-Brazil. ACTA ACUST UNITED AC 2015; 58:918-25. [PMID: 25627047 DOI: 10.1590/0004-2730000003510] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 09/14/2014] [Indexed: 02/26/2023]
Abstract
OBJECTIVE The aim of this study was to investigate the association between the rs7903146 (C/T) polymorphism in the TCF7L2 gene and type 2 diabetes mellitus, in a Southern-Brazilian population. MATERIALS AND METHODS The TCF7L2 rs7903146 polymorphism was genotyped in 953 type 2 diabetic patients and 535 non-diabetic subjects. All subjects were white. The polymorphism was genotyped by Real-Time PCR using TaqMan MGB probes (Life Technologies). Odds ratios (OR) and 95% confidence intervals (CI) were calculated for additive, recessive and dominant inheritance models. RESULTS Genotype and allele frequencies of the rs7903146 polymorphism differed significantly between type 2 diabetic patients and non-diabetic subjects (P = 0.001 and P = 0.0001, respectively). The frequency of the minor allele was 38% in type 2 diabetes group and 31% in non-diabetic subjects, and this allele was significantly associated with type 2 diabetes risk (OR = 1.42, 95% CI 1.15 - 1.76 for the dominant model of inheritance). Moreover, the T/T genotype was associated with a higher risk for type 2 diabetes (OR = 1.83, 95% CI 1.3-2.5) than the presence of only one copy of the T allele (OR = 1.31, 95% CI 1.1-1.6). Both results were adjusted for age and gender. CONCLUSIONS Our results confirm the association between the TCF7L2 rs7903146 polymorphism and increase risk for type 2 diabetes in Southern-Brazil.
Collapse
Affiliation(s)
- Taís S Assmann
- Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Guilherme C K Duarte
- Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Jakeline Rheinheimer
- Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Lavínia A Cruz
- Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Luís H Canani
- Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Daisy Crispim
- Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| |
Collapse
|
12
|
Boef AGC, Dekkers OM, le Cessie S. Mendelian randomization studies: a review of the approaches used and the quality of reporting. Int J Epidemiol 2015; 44:496-511. [PMID: 25953784 DOI: 10.1093/ije/dyv071] [Citation(s) in RCA: 276] [Impact Index Per Article: 30.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2015] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Mendelian randomization (MR) studies investigate the effect of genetic variation in levels of an exposure on an outcome, thereby using genetic variation as an instrumental variable (IV). We provide a meta-epidemiological overview of the methodological approaches used in MR studies, and evaluate the discussion of MR assumptions and reporting of statistical methods. METHODS We searched PubMed, Medline, Embase and Web of Science for MR studies up to December 2013. We assessed (i) the MR approach used; (ii) whether the plausibility of MR assumptions was discussed; and (iii) whether the statistical methods used were reported adequately. RESULTS Of 99 studies using data from one study population, 32 used genetic information as a proxy for the exposure without further estimation, 44 performed a formal IV analysis, 7 compared the observed with the expected genotype-outcome association, and 1 used both the latter two approaches. The 80 studies using data from multiple study populations used many different approaches to combine the data; 52 of these studies used some form of IV analysis; 44% of studies discussed the plausibility of all three MR assumptions in their study. Statistical methods used for IV analysis were insufficiently described in 14% of studies. CONCLUSIONS Most MR studies either use the genotype as a proxy for exposure without further estimation or perform an IV analysis. The discussion of underlying assumptions and reporting of statistical methods for IV analysis are frequently insufficient. Studies using data from multiple study populations are further complicated by the combination of data or estimates. We provide a checklist for the reporting of MR studies.
Collapse
Affiliation(s)
- Anna G C Boef
- Department of Clinical Epidemiology, Department of Endocrinology and Metabolic Diseases, and Department of Medical Statistics and Bioinformatics, Leiden University Medical Centre, Leiden, The Netherlands.
| | - Olaf M Dekkers
- Department of Clinical Epidemiology, Department of Endocrinology and Metabolic Diseases, and Department of Medical Statistics and Bioinformatics, Leiden University Medical Centre, Leiden, The Netherlands. Department of Clinical Epidemiology, Department of Endocrinology and Metabolic Diseases, and Department of Medical Statistics and Bioinformatics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Saskia le Cessie
- Department of Clinical Epidemiology, Department of Endocrinology and Metabolic Diseases, and Department of Medical Statistics and Bioinformatics, Leiden University Medical Centre, Leiden, The Netherlands. Department of Clinical Epidemiology, Department of Endocrinology and Metabolic Diseases, and Department of Medical Statistics and Bioinformatics, Leiden University Medical Centre, Leiden, The Netherlands
| |
Collapse
|
13
|
VanderWeele TJ, Tchetgen Tchetgen EJ, Cornelis M, Kraft P. Methodological challenges in mendelian randomization. Epidemiology 2014; 25:427-35. [PMID: 24681576 PMCID: PMC3981897 DOI: 10.1097/ede.0000000000000081] [Citation(s) in RCA: 352] [Impact Index Per Article: 35.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We give critical attention to the assumptions underlying Mendelian randomization analysis and their biological plausibility. Several scenarios violating the Mendelian randomization assumptions are described, including settings with inadequate phenotype definition, the setting of time-varying exposures, the presence of gene-environment interaction, the existence of measurement error, the possibility of reverse causation, and the presence of linkage disequilibrium. Data analysis examples are given, illustrating that the inappropriate use of instrumental variable techniques when the Mendelian randomization assumptions are violated can lead to biases of enormous magnitude. To help address some of the strong assumptions being made, three possible approaches are suggested. First, the original proposal of Katan (Lancet. 1986;1:507-508) for Mendelian randomization was not to use instrumental variable techniques to obtain estimates but merely to examine genotype-outcome associations to test for the presence of an effect of the exposure on the outcome. We show that this more modest goal and approach can circumvent many, though not all, the potential biases described. Second, we discuss the use of sensitivity analysis in evaluating the consequences of violations in the assumptions and in attempting to correct for those violations. Third, we suggest that a focus on negative, rather than positive, Mendelian randomization results may turn out to be more reliable.
Collapse
Affiliation(s)
- Tyler J VanderWeele
- From the aDepartments of Epidemiology and Biostatistics, Harvard School of Public Health, Boston, MA; and bDepartment of Nutrition, Harvard School of Public Health, Boston, MA
| | | | | | | |
Collapse
|
14
|
Huang T, Ren J, Huang J, Li D. Association of homocysteine with type 2 diabetes: a meta-analysis implementing Mendelian randomization approach. BMC Genomics 2013; 14:867. [PMID: 24320691 PMCID: PMC3878883 DOI: 10.1186/1471-2164-14-867] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2013] [Accepted: 11/27/2013] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND We tested the hypothesis that elevated homocysteine (Hcy) level is causally associated with increased risk of type 2 diabetes mellitus (T2DM). RESULTS The meta-analysis and Mendelian randomization analysis were performed among 4011 cases and 4303 controls. The absolute pooled mean Hcy concentration in subjects with MTHFR 677TT was 5.55 μmol/L (95% CI, 1.33 to 9.77) greater than that in subjects with MTHFR 677CC in T2DM. Overall, the T allele of the MTHFR 677 C > T conferred a greater risk for T2DM [Random effect (RE) OR = 1.31(1.17-1.64), I² = 41.0%, p = 0.055]. The random effect (RE) pooled OR associated with T2DM for MTHFR 677TT relative to the 677CC was [RE OR = 1.38(1.18-1.62)]. The fixed-effect pooled OR of the association for the MTHFR 677 TT vs CT was 1.29 (95% CI, 1.09-1.51). MTHFR 677 TT showed a significantly higher risk for T2DM compared with MTHFR 677 CC + CT [Fixed effect (FE) OR = 1.32(1.14-1.54), I² = 0.0%, p = 0.686]. The absolute pooled mean Hcy concentration in individuals with T2DM was 0.94 μmol/L (95% CI, 0.40-1.48) greater than that in control subjects. The estimated causal OR associated with T2DM was 1.29 for 5 μmol/L increment in Hcy. CONCLUSIONS Our findings provided strong evidence on the causal association of Hcy level with the development of T2DM.
Collapse
Affiliation(s)
| | | | | | - Duo Li
- Department of Food Science and Nutrition, Zhejiang University, 268 Kaixuan Road, Hangzhou 310029, China.
| |
Collapse
|
15
|
Zang L, Shimada Y, Nishimura Y, Tanaka T, Nishimura N. A novel, reliable method for repeated blood collection from aquarium fish. Zebrafish 2013; 10:425-32. [PMID: 23668933 DOI: 10.1089/zeb.2012.0862] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Collecting blood from laboratory animals is necessary for a wide variety of scientific studies, but the small size of the zebrafish makes this common procedure challenging. We developed a novel, minimally invasive method to collect repeated blood samples from adult zebrafish. This method minimizes trauma to the zebrafish and yields a low mortality rate of 2.3%. The maximum volume of blood that can be collected using this technique is approximately 2% of body weight. To avoid blood loss anemia and hemorrhagic death, we recommend that the total blood sample volume collected over repeat bleeds should be ≤0.4% of body weight per week, and ≤1% of body weight per 2 weeks. Additionally, we applied this method to the study of zebrafish glycolipid metabolism by measuring blood glucose and plasma triacylglyceride levels weekly over a 5-week period in both control and overfed zebrafish. The overfed fish developed significantly increased fasting blood glucose levels compared with normally fed fish. This new method of blood collection is essential for zebrafish or other small aquarium fish research requiring repeated blood samples, and increases the utility of the zebrafish as a model animal in hematological studies of human diseases.
Collapse
Affiliation(s)
- Liqing Zang
- Department of Translational Medical Science, Mie University, Tsu, Japan .
| | | | | | | | | |
Collapse
|