23 results on '"Om Prakash Dwivedi"'
Search Results
2. Genome-wide mRNA profiling in urinary extracellular vesicles reveals stress gene signature for diabetic kidney disease
- Author
-
Om Prakash Dwivedi, Karina Barreiro, Annemari Käräjämäki, Erkka Valo, Anil K. Giri, Rashmi B. Prasad, Rishi Das Roy, Lena M. Thorn, Antti Rannikko, Harry Holthöfer, Kim M. Gooding, Steven Sourbron, Denis Delic, Maria F. Gomez, Per-Henrik Groop, Tiinamaija Tuomi, Carol Forsblom, Leif Groop, and Maija Puhka
- Subjects
Medicine ,Clinical finding ,Disease ,Specimen ,Biopsy sample ,Science - Abstract
Summary: Urinary extracellular vesicles (uEV) are a largely unexplored source of kidney-derived mRNAs with potential to serve as a liquid kidney biopsy. We assessed ∼200 uEV mRNA samples from clinical studies by genome-wide sequencing to discover mechanisms and candidate biomarkers of diabetic kidney disease (DKD) in Type 1 diabetes (T1D) with replication in Type 1 and 2 diabetes. Sequencing reproducibly showed >10,000 mRNAs with similarity to kidney transcriptome. T1D DKD groups showed 13 upregulated genes prevalently expressed in proximal tubules, correlated with hyperglycemia and involved in cellular/oxidative stress homeostasis. We used six of them (GPX3, NOX4, MSRB, MSRA, HRSP12, and CRYAB) to construct a transcriptional “stress score” that reflected long-term decline of kidney function and could even identify normoalbuminuric individuals showing early decline. We thus provide workflow and web resource for studying uEV transcriptomes in clinical urine samples and stress-linked DKD markers as potential early non-invasive biomarkers or drug targets.
- Published
- 2023
- Full Text
- View/download PDF
3. Urinary extracellular vesicles: Assessment of pre‐analytical variables and development of a quality control with focus on transcriptomic biomarker research
- Author
-
Karina Barreiro, Om Prakash Dwivedi, Sami Valkonen, Per‐Henrik Groop, Tiinamaija Tuomi, Harry Holthofer, Antti Rannikko, Marjo Yliperttula, Pia Siljander, Saara Laitinen, Elina Serkkola, Taija af Hällström, Carol Forsblom, Leif Groop, and Maija Puhka
- Subjects
biomarkers ,DNAse ,microRNA ,mRNA ,storage temperature ,storage time ,Cytology ,QH573-671 - Abstract
Abstract Urinary extracellular vesicles (uEV) are a topical source of non‐invasive biomarkers for health and diseases of the urogenital system. However, several challenges have become evident in the standardization of uEV pipelines from collection of urine to biomarker analysis. Here, we studied the effect of pre‐analytical variables and developed means of quality control for uEV isolates to be used in transcriptomic biomarker research. We included urine samples from healthy controls and individuals with type 1 or type 2 diabetes and normo‐, micro‐ or macroalbuminuria and isolated uEV by ultracentrifugation. We studied the effect of storage temperature (‐20°C vs. ‐80°C), time (up to 4 years) and storage format (urine or isolated uEV) on quality of uEV by nanoparticle tracking analysis, electron microscopy, Western blotting and qPCR. Urinary EV RNA was compared in terms of quantity, quality, and by mRNA or miRNA sequencing. To study the stability of miRNA levels in samples isolated by different methods, we created and tested a list of miRNAs commonly enriched in uEV isolates. uEV and their transcriptome were preserved in urine or as isolated uEV even after long‐term storage at ‐80°C. However, storage at ‐20°C degraded particularly the GC‐rich part of the transcriptome and EV protein markers. Transcriptome was preserved in RNA samples extracted with and without DNAse, but read distributions still showed some differences in e.g. intergenic and intronic reads. MiRNAs commonly enriched in uEV isolates were stable and concordant between different EV isolation methods. Analysis of never frozen uEV helped to identify surface characteristics of particles by EM. In addition to uEV, qPCR assays demonstrated that uEV isolates commonly contained polyoma viruses. Based on our results, we present recommendations how to store and handle uEV isolates for transcriptomics studies that may help to expedite standardization of the EV biomarker field.
- Published
- 2021
- Full Text
- View/download PDF
4. Genetic inactivation of ANGPTL4 improves glucose homeostasis and is associated with reduced risk of diabetes
- Author
-
Viktoria Gusarova, Colm O’Dushlaine, Tanya M. Teslovich, Peter N. Benotti, Tooraj Mirshahi, Omri Gottesman, Cristopher V. Van Hout, Michael F. Murray, Anubha Mahajan, Jonas B. Nielsen, Lars Fritsche, Anders Berg Wulff, Daniel F. Gudbjartsson, Marketa Sjögren, Connor A. Emdin, Robert A. Scott, Wen-Jane Lee, Aeron Small, Lydia C. Kwee, Om Prakash Dwivedi, Rashmi B. Prasad, Shannon Bruse, Alexander E. Lopez, John Penn, Anthony Marcketta, Joseph B. Leader, Christopher D. Still, H. Lester Kirchner, Uyenlinh L. Mirshahi, Amr H. Wardeh, Cassandra M. Hartle, Lukas Habegger, Samantha N. Fetterolf, Teresa Tusie-Luna, Andrew P. Morris, Hilma Holm, Valgerdur Steinthorsdottir, Patrick Sulem, Unnur Thorsteinsdottir, Jerome I. Rotter, Lee-Ming Chuang, Scott Damrauer, David Birtwell, Chad M. Brummett, Amit V. Khera, Pradeep Natarajan, Marju Orho-Melander, Jason Flannick, Luca A. Lotta, Cristen J. Willer, Oddgeir L. Holmen, Marylyn D. Ritchie, David H. Ledbetter, Andrew J. Murphy, Ingrid B. Borecki, Jeffrey G. Reid, John D. Overton, Ola Hansson, Leif Groop, Svati H. Shah, William E. Kraus, Daniel J. Rader, Yii-Der I. Chen, Kristian Hveem, Nicholas J. Wareham, Sekar Kathiresan, Olle Melander, Kari Stefansson, Børge G. Nordestgaard, Anne Tybjærg-Hansen, Goncalo R. Abecasis, David Altshuler, Jose C. Florez, Michael Boehnke, Mark I. McCarthy, George D. Yancopoulos, David J. Carey, Alan R. Shuldiner, Aris Baras, Frederick E. Dewey, and Jesper Gromada
- Subjects
Science - Abstract
Genetic variation in ANGPTL4 is associated with lipid traits. Here, the authors find that predicted loss-of-function variants in ANGPTL4 are associated with glucose homeostasis and reduced risk of type 2 diabetes and that Angptl4 −/− mice on a high-fat diet show improved insulin sensitivity.
- Published
- 2018
- Full Text
- View/download PDF
5. Common variants of FTO are associated with childhood obesity in a cross-sectional study of 3,126 urban Indian children.
- Author
-
Om Prakash Dwivedi, Rubina Tabassum, Ganesh Chauhan, Saurabh Ghosh, Raman K Marwaha, Nikhil Tandon, and Dwaipayan Bharadwaj
- Subjects
Medicine ,Science - Abstract
FTO variants are robustly associated with obesity and related traits in many population and shown to have variable impact during life course. Although studies have shown association of FTO variants with adiposity in adult Indian, its association in Indian children is yet to be confirmed.Here we examined association of FTO variants (rs9939609 and rs8050136) with obesity and related anthropometric and biochemical traits in 3,126 Indian children (aged 11-17 years) including 2,230 normal-weight and 896 over-weight/obese children. We also compared effects observed in the present study with that observed in previous studies on South Asian adults and children of other ethnic groups.The variant rs9939609 showed significant association with risk of obesity [OR = 1.21, P = 2.5 × 10(-3)] and its measures BMI, weight, waist circumference and hip circumference [β range = 0.11 to 0.14 Z-score units; P range = 1.3 × 10(-4) to 1.6 × 10(-7)] in children. The observed effect sizes in Indian children were similar to those reported for European children. Variant rs9939609 explained 0.88% of BMI variance in Indian children. The effect sizes of rs9939609 on BMI and WC were ~2 fold higher in children than adults. Interestingly rs9939609 was also associated with serum levels of thyroid stimulating hormone (TSH) [β = 0.10 Z-score, P = 5.8 × 10(-3)]. The other variant rs8050136 was in strong linkage disequilibrium with rs9939609 (r(2) = 0.97) and provided similar association results.The study provides first report of association of FTO variants with obesity and related anthropometric traits in Indian children with higher impact in children compared to adults. We also demonstrated association of FTO variant with serum levels of TSH, indicating putative influence of FTO in hypothalamic-pituitary-thyroid axis.
- Published
- 2012
- Full Text
- View/download PDF
6. Genetic variant of AMD1 is associated with obesity in urban Indian children.
- Author
-
Rubina Tabassum, Alok Jaiswal, Ganesh Chauhan, Om Prakash Dwivedi, Saurabh Ghosh, Raman K Marwaha, Nikhil Tandon, and Dwaipayan Bharadwaj
- Subjects
Medicine ,Science - Abstract
Hyperhomocysteinemia is regarded as a risk factor for cardiovascular diseases, diabetes and obesity. Manifestation of these chronic metabolic disorders starts in early life marked by increase in body mass index (BMI). We hypothesized that perturbations in homocysteine metabolism in early life could be a link between childhood obesity and adult metabolic disorders. Thus here we investigated association of common variants from homocysteine metabolism pathway genes with obesity in 3,168 urban Indian children.We genotyped 90 common variants from 18 genes in 1,325 children comprising of 862 normal-weight (NW) and 463 over-weight/obese (OW/OB) children in stage 1. The top signal obtained was replicated in an independent sample set of 1843 children (1,399 NW and 444 OW/OB) in stage 2. Stage 1 association analysis revealed association between seven variants and childhood obesity at P
- Published
- 2012
- Full Text
- View/download PDF
7. Common variants in CRP and LEPR influence high sensitivity C-reactive protein levels in North Indians.
- Author
-
Anubha Mahajan, Rubina Tabassum, Sreenivas Chavali, Om Prakash Dwivedi, Ganesh Chauhan, Saurabh Ghosh, Nikhil Tandon, and Dwaipayan Bharadwaj
- Subjects
Medicine ,Science - Abstract
BackgroundHigh sensitivity C-reactive protein (hsCRP) levels are shown to be influenced by genetic variants in Europeans; however, little is explored in Indian population.MethodsHerein, we comprehensively evaluated association of all previously reported genetic determinants of hsCRP levels, including 18 cis (proximal to CRP gene) and 73 trans-acting (distal to CRP gene) variants in 4,200 North Indians of Indo-European ethnicity. First, we evaluated association of 91 variants from 12 candidate loci with hsCRP levels in 2,115 North Indians (1,042 non-diabetic subjects and 1,073 patients with type 2 diabetes). Then, cis and trans-acting variants contributing maximally to hsCRP level variation were further replicated in an independent 2,085 North Indians (1,047 patients with type 2 diabetes and 1,038 non-diabetic subjects).ResultsWe found association of 12 variants from CRP, LEPR, IL1A, IL6, and IL6R with hsCRP levels in non-diabetic subjects. However, only rs3093059-CRP [β = 0.33, P = 9.6×10⁻⁵] and the haplotype harboring rs3093059 risk allele [β = 0.32 µg/mL, P = 1.4×10⁻⁴/P(perm) = 9.0×10⁻⁴] retained significance after correcting for multiple testing. The cis-acting variant rs3093059-CRP had maximum contribution to the variance in hsCRP levels (1.14%). Among, trans-acting variants, rs1892534-LEPR was observed to contribute maximally to hsCRP level variance (0.59%). Associations of rs3093059-CRP and rs1892534-LEPR were confirmed by replication and attained higher significance after meta-analysis [β(meta) = 0.26/0.22; P(meta) = 4.3×10⁻⁷/7.4×10⁻³ and β(meta) = -0.15/-0.12; P(meta) = 2.0×10⁻⁶/1.6×10⁻⁶ for rs3093059 and rs1892534, respectively in non-diabetic subjects and all subjects taken together].ConclusionIn conclusion, we identified rs3093059 in CRP and rs1892534 in LEPR as major cis and trans-acting contributor respectively, to the variance in hsCRP levels in North Indian population.
- Published
- 2011
- Full Text
- View/download PDF
8. Bioprecarity, Disposability, and the Poetics of Hope in Swarga
- Author
-
Om Prakash Dwivedi
- Subjects
General Arts and Humanities ,General Social Sciences - Abstract
This article conceptualizes the everyday existential crisis of man, nature, including the planetary life as bioprecarity. It looks at the neoliberal capitalist economy that renders bios precarious. The bios incudes humans, more-than-humans, and natural resources in the Global South, available for value-generation of a select few. The article argues that disposability of bios triggers and expands neoliberal economy, thus turning entire life forms on the planet precarious. This horrendous task of erasing life-sustaining conditions and strengthening value-generation process can be abundantly found in Ambikasutan Mangad’s novel, Swarga (2017), which narrates the precarious man-nature relationship as a result of the extractive forces of neoliberalism. In the last section of the article, I turn to Phillip E Wegner’s conceptualization of “close-critical reading” paradigm as a poetics of hope in these dark times, thus highlighting how hope nourishes the fight of Enmakaje people against the capital-state complex.
- Published
- 2022
- Full Text
- View/download PDF
9. Introduction: Partition — 75 Years On
- Author
-
Om Prakash Dwivedi, Kamran Asdar Ali, and Tabish Khair
- Subjects
Literature and Literary Theory - Published
- 2022
- Full Text
- View/download PDF
10. Global crisis management and higher education: Agency and coupling in the context of wicked <scp>COVID</scp> ‐19 problems
- Author
-
Anatoly Oleksiyenko, Pilar Mendoza, Fredy Esteban Cárdenas Riaño, Om Prakash Dwivedi, Arif H. Kabir, Aliya Kuzhabekova, Muweesi Charles, Vutha Ros, and Ielyzaveta Shchepetylnykova
- Subjects
Education - Published
- 2022
- Full Text
- View/download PDF
11. Capturing the Kidney Transcriptome by Urinary Extracellular Vesicles—From Pre-Analytical Obstacles to Biomarker Research
- Author
-
Puhka, Karina Barreiro, Om Prakash Dwivedi, Antti Rannikko, Harry Holthöfer, Tiinamaija Tuomi, Per-Henrik Groop, and Maija
- Subjects
urinary extracellular vesicles ,exosomes ,urine ,diabetic kidney disease ,reference genes ,miRNA ,mRNA ,sequencing - Abstract
Urinary extracellular vesicles (uEV) hold non-invasive RNA biomarkers for genitourinary tract diseases. However, missing knowledge about reference genes and effects of preanalytical choices hinder biomarker studies. We aimed to assess how preanalytical variables (urine storage temperature, isolation workflow) affect diabetic kidney disease (DKD)—linked miRNAs or kidney—linked miRNAs and mRNAs (kidney-RNAs) in uEV isolates and to discover stable reference mRNAs across diverse uEV datasets. We studied nine raw and normalized sequencing datasets including healthy controls and individuals with prostate cancer or type 1 diabetes with or without albuminuria. We focused on kidney-RNAs reviewing literature for DKD-linked miRNAs from kidney tissue, cell culture and uEV/urine experiments. RNAs were analyzed by expression heatmaps, hierarchical clustering and selecting stable mRNAs with normalized counts (>200) and minimal coefficient of variation. Kidney-RNAs were decreased after urine storage at −20 °C vs. −80 °C. Isolation workflows captured kidney-RNAs with different efficiencies. Ultracentrifugation captured DKD -linked miRNAs that separated healthy and diabetic macroalbuminuria groups. Eleven mRNAs were stably expressed across the datasets. Hence, pre-analytical choices had variable effects on kidney-RNAs—analyzing kidney-RNAs complemented global correlation, which could fade differences in some relevant RNAs. Replicating prior DKD-marker results and discovery of candidate reference mRNAs encourages further uEV biomarker studies.
- Published
- 2023
- Full Text
- View/download PDF
12. Writing Feminist Hermeneutics through Liminality: A Reading of Tahmima Anam’s A Golden Age
- Author
-
Om Prakash Dwivedi
- Subjects
Gender Studies ,General Arts and Humanities ,General Social Sciences - Published
- 2022
- Full Text
- View/download PDF
13. Planetary precarity and the pandemic
- Author
-
Om Prakash Dwivedi, Janet M Wilson, and Cristina M. Gámez-Fernández
- Subjects
History ,Precarity ,Literature and Literary Theory ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,0602 languages and literature ,05 social sciences ,Pandemic ,0507 social and economic geography ,Economic history ,06 humanities and the arts ,060202 literary studies ,050701 cultural studies - Abstract
As this special issue of the Journal of Postcolonial Writing goes to print, fear of the life-changing and life-taking SARS-CoV-2 virus spreads worldwide faster than the virus itself. The volume’s v...
- Published
- 2020
- Full Text
- View/download PDF
14. Impaired hepatic lipid synthesis from polyunsaturated fatty acids in TM6SF2 E167K variant carriers with NAFLD
- Author
-
Panu K. Luukkonen, Jeremy M. Palmer, Taru Tukiainen, Marja Leivonen, Marju Orho-Melander, Hannele Yki-Järvinen, Adnan Ali, Johanna Arola, Petter Vikman, Leif Groop, Matej Orešič, Tuulia Hyötyläinen, Emma Scott, P.A. Nidhina Haridas, Vesa M. Olkkonen, Quentin M. Anstee, You Zhou, Anne Juuti, Linda Ahonen, Om Prakash Dwivedi, Department of Medicine, Clinicum, Institute for Molecular Medicine Finland, II kirurgian klinikka, Department of Surgery, Medicum, Department of Pathology, Leif Groop Research Group, Hannele Yki-Järvinen Research Group, HUS Internal Medicine and Rehabilitation, and HUS Abdominal Center
- Subjects
Male ,0301 basic medicine ,Apolipoprotein B ,Lipoproteins, VLDL ,chemistry.chemical_compound ,ta318 ,chemistry.chemical_classification ,INSULIN-RESISTANCE ,biology ,NONALCOHOLIC STEATOHEPATITIS ,Middle Aged ,Lipids ,Transmembrane protein ,3. Good health ,Liver ,Arachidonic acid ,LOW-DENSITY LIPOPROTEINS ,CARDIOVASCULAR-DISEASE ,Phosphatidylethanolamine N-methyltransferase ,Lipogenesis ,Fatty Acids, Unsaturated ,Phosphatidylcholines ,Female ,lipids (amino acids, peptides, and proteins) ,Polyunsaturated fatty acid ,Adult ,Heterozygote ,medicine.medical_specialty ,Genotype ,APOLIPOPROTEIN-B ,Cholesterol esters ,digestive system ,03 medical and health sciences ,Insulin resistance ,LIVER-DISEASE ,Internal medicine ,medicine ,Humans ,Fatty acids ,Triglycerides ,Hepatology ,PHOSPHATIDYLETHANOLAMINE N-METHYLTRANSFERASE ,Membrane Proteins ,nutritional and metabolic diseases ,ARACHIDONIC-ACID ,medicine.disease ,digestive system diseases ,030104 developmental biology ,Endocrinology ,chemistry ,3121 General medicine, internal medicine and other clinical medicine ,Hepatocytes ,FIBROSIS PROGRESSION ,biology.protein ,Transmembrane 6 superfamily member 2 ,SUPERFAMILY MEMBER 2 ,Non-alcoholic fatty liver disease ,TM6SF2 - Abstract
Background: Carriers of the transmembrane 6 superfamily member 2 E167K gene variant (TM6SF2(EK/KK)) have decreased expression of the TM6SF2 gene and increased risk of NAFLD and NASH. Unlike common 'obese/metabolic' NAFLD, these subjects lack hypertriglyceridemia and have lower risk of cardiovascular disease. In animals, phosphatidylcholine (PC) deficiency results in a similar phenotype. PCs surround the core of VLDL consisting of triglycerides (TGs) and cholesteryl-esters (CEs). We determined the effect of the TM6SF2 E167K on these lipids in the human liver and serum and on hepatic gene expression and studied the effect of TM6SF2 knockdown on hepatocyte handling of these lipids. Methods: Liver biopsies were taken from subjects characterized with respect to the TM6SF2 genotype, serum and liver lipidome, gene expression and histology. In vitro, after TM6SF2 knockdown in HuH-7 cells, we compared incorporation of different fatty acids into TGs, CEs, and PCs. Results: The TM6SF2(EK/KK) and TM6SF2EE groups had similar age, gender, BMI and HOMA-IR. Liver TGs and CEs were higher and liver PCs lower in the TM6SF2(EK/KK) than the TM6SF2EE group (p Conclusions: Hepatic lipid synthesis from PUFAs is impaired and could contribute to deficiency in PCs and increased intrahepatic TG in TM6SF2 E167K variant carriers. (C) 2017 European Association for the Study of the Liver. Published by Elsevier B.V. All rights reserved.
- Published
- 2017
- Full Text
- View/download PDF
15. Loss of ZnT8 function protects against diabetes by enhanced insulin secretion
- Author
-
Maddalena Trombetta, Fernando Abaitua, Isabella Artner, Nicola L. Beer, Ulrika Krus, Reshma Ramracheya, Jesper Gromada, Jason Flannick, Philipp Kramer, Martijn van de Bunt, Mark I. McCarthy, Deepak Jain, Patrik Rorsman, Enzo Bonora, Rebecca Cheung, Julia Brosnan, Ioannis Spiliotis, Anu Suoranta, Pauline Chabosseau, Antje Grotz, Ann Marie Richard, Claes B. Wolheim, Ola Hansson, Riccardo C. Bonadonna, Anna L. Gloyn, Leif Groop, Om Prakash Dwivedi, Mikko Lehtovirta, Anthony Payne, Timo Otonkoski, Vikash Chandra, L Sarelin, Nicole A.J. Krentz, Sandra Kleiner, Benjamin Davies, Soren K. Thomsen, Benoit Hastoy, Guy A. Rutter, Tiinamaija Tuomi, Daniel Gomez, Benoite Champon, Jens O. Lagerstedt, Emma Ahlqvist, Aris Baras, Daniela Moralli, Rashmi B. Prasad, and Andria Theodoulou
- Subjects
Adult ,Male ,medicine.medical_specialty ,endocrine system ,endocrine system diseases ,Adolescent ,Genotype ,Induced Pluripotent Stem Cells ,Type 2 diabetes ,Zinc Transporter 8 ,Biology ,Article ,Aged ,Diabetes Mellitus, Type 2 ,Female ,Glucose ,Humans ,Islets of Langerhans ,Middle Aged ,Young Adult ,Insulin Secretion ,03 medical and health sciences ,0302 clinical medicine ,Diabetes mellitus ,Internal medicine ,Diabetes Mellitus ,Genetics ,medicine ,Glucose homeostasis ,Allele ,11 Medical and Health Sciences ,030304 developmental biology ,Proinsulin ,0303 health sciences ,SLC30A8 ,Glucagon secretion ,06 Biological Sciences ,medicine.disease ,Endocrinology ,biology.protein ,Type 2 ,030217 neurology & neurosurgery ,Developmental Biology - Abstract
A rare loss-of-function allele p.Arg138* in SLC30A8 encoding the zinc transporter 8 (ZnT8), which is enriched in Western Finland, protects against type 2 diabetes (T2D). We recruited relatives of the identified carriers and showed that protection was associated with better insulin secretion due to enhanced glucose responsiveness and proinsulin conversion, particularly when compared with individuals matched for the genotype of a common T2D-risk allele in SLC30A8, p.Arg325. In genome-edited human induced pluripotent stem cell (iPSC)-derived β-like cells, we establish that the p.Arg138* allele results in reduced SLC30A8 expression due to haploinsufficiency. In human β cells, loss of SLC30A8 leads to increased glucose responsiveness and reduced KATP channel function similar to isolated islets from carriers of the T2D-protective allele p.Trp325. These data position ZnT8 as an appealing target for treatment aimed at maintaining insulin secretion capacity in T2D.
- Published
- 2019
- Full Text
- View/download PDF
16. Genome-Wide Association Study for Type 2 Diabetes in Indians Identifies a New Susceptibility Locus at 2q21
- Author
-
Ganesh Chauhan, Alok Jaiswal, Reddy K. Srinath, Lakshmi Ramakrishnan, Nikhil Tandon, Pradeep Venkatesh, Dwaipayan Bharadwaj, Sri Venkata Madhu, Sreenivas Chavali, Saurabh Ghosh, Anil Bhansali, Indico, Manickam Chidambaram, Amitabh Sharma, Viral N. Shah, Ismeet Kaur, S.K. Aggarwal, Sandeep Kumar Mathur, Monisha Banerjee, Madhukar Saxena, Om Prakash Dwivedi, Tejbir Singh, Radha Venkatesan, Rubina Tabassum, Viswanathan Mohan, Benan John Mathai, Shantanu Sengupta, Khushdeep Bandesh, Raman K. Marwaha, Vinod Scaria, Mark I. McCarthy, Yogesh Pandey, Dorairaj Prabhakaran, Anubha Mahajan, and Analabha Basu
- Subjects
Endocrinology, Diabetes and Metabolism ,India ,Nerve Tissue Proteins ,030209 endocrinology & metabolism ,Locus (genetics) ,Genome-wide association study ,Type 2 diabetes ,Biology ,Polymorphism, Single Nucleotide ,White People ,03 medical and health sciences ,0302 clinical medicine ,Insulin resistance ,Asian People ,Diabetes mellitus ,Internal Medicine ,medicine ,Humans ,Genetic Predisposition to Disease ,Aged ,030304 developmental biology ,Genetics ,0303 health sciences ,Membrane Proteins ,Genetics/Genomes/Proteomics/Metabolomics ,Odds ratio ,Middle Aged ,medicine.disease ,3. Good health ,Diabetes Mellitus, Type 2 ,Genetic Loci ,Chromosomes, Human, Pair 2 ,Homeostatic model assessment ,Insulin Resistance ,Imputation (genetics) ,Genome-Wide Association Study - Abstract
Indians undergoing socioeconomic and lifestyle transitions will be maximally affected by epidemic of type 2 diabetes (T2D). We conducted a two-stage genome-wide association study of T2D in 12,535 Indians, a less explored but high-risk group. We identified a new type 2 diabetes–associated locus at 2q21, with the lead signal being rs6723108 (odds ratio 1.31; P = 3.32 × 10−9). Imputation analysis refined the signal to rs998451 (odds ratio 1.56; P = 6.3 × 10−12) within TMEM163 that encodes a probable vesicular transporter in nerve terminals. TMEM163 variants also showed association with decreased fasting plasma insulin and homeostatic model assessment of insulin resistance, indicating a plausible effect through impaired insulin secretion. The 2q21 region also harbors RAB3GAP1 and ACMSD; those are involved in neurologic disorders. Forty-nine of 56 previously reported signals showed consistency in direction with similar effect sizes in Indians and previous studies, and 25 of them were also associated (P < 0.05). Known loci and the newly identified 2q21 locus altogether explained 7.65% variance in the risk of T2D in Indians. Our study suggests that common susceptibility variants for T2D are largely the same across populations, but also reveals a population-specific locus and provides further insights into genetic architecture and etiology of T2D.
- Published
- 2013
- Full Text
- View/download PDF
17. Association of variants in genes involved in pancreatic β-cell development and function with type 2 diabetes in North Indians
- Author
-
Ganesh Chauhan, Sreenivas Chavali, Saurabh Ghosh, Rubina Tabassum, Anubha Mahajan, Om Prakash Dwivedi, Nikhil Tandon, and Dwaipayan Bharadwaj
- Subjects
medicine.medical_specialty ,Genotype ,Nerve Tissue Proteins ,Type 2 diabetes ,Biology ,Polymorphism, Single Nucleotide ,ABCC8 ,Body Mass Index ,Insulin-Secreting Cells ,Internal medicine ,Basic Helix-Loop-Helix Transcription Factors ,Genetics ,medicine ,Humans ,Genetic Predisposition to Disease ,Obesity ,Genetics (clinical) ,Genetic association ,Homeodomain Proteins ,Haplotype ,Genetic Variation ,Nuclear Proteins ,Odds ratio ,medicine.disease ,HNF1A ,Homeobox Protein Nkx-2.2 ,Endocrinology ,Diabetes Mellitus, Type 2 ,Haplotypes ,Hepatocyte Nuclear Factor 4 ,Case-Control Studies ,Indians, North American ,biology.protein ,PDX1 ,Transcription Factors - Abstract
Variants in genes involved in pancreatic β-cell development and function are known to cause monogenic forms of type 2 diabetes and are also associated with complex form. In this study, we studied the genetic association of polymorphisms in such important genes with type 2 diabetes in the high-risk Indians. We genotyped 91 polymorphisms in 19 genes (ABCC8, HNF1A, HNF1B, HNF4A, INS, INSM1, ISL1, KCNJ11, MAFA, MNX1, NEUROD1, NEUROG3, NKX2.2, NKX6.1, PAX4, PAX6, PDX1, USF1 and WFS1) in 2025 unrelated North Indians of Indo-European ethnicity comprising of 1019 diabetic and 1006 non-diabetic subjects. HNF4A promoter P2 polymorphisms rs1884613 and rs2144908, which are in high linkage disequilibrium, showed significant association with type 2 diabetes (odds ratio (OR)=1.37 (95% confidence interval (CI) 1.19-1.57), P=9.4 × 10(-6) for rs1884613 and OR=1.37 (95%CI 1.20-1.57), P=6.0 × 10(-6) for rs2144908), as previously shown in other populations. We observed body mass index-dependent association of these variants with type 2 diabetes in normal-weight/lean subjects. Variants in USF1, ABCC8, ISL1 and KCNJ11 showed nominal association, while haplotypes in these genes were significantly associated. rs3812704 upstream of NEUROG3 significantly increased risk for type 2 diabetes in normal-weight/lean subjects (OR=1.68 (95%CI 1.25-2.24), P=4.9 × 10(-4)). Thus, pancreatic β-cell development and function genes contribute to susceptibility to type 2 diabetes in North Indians.
- Published
- 2011
- Full Text
- View/download PDF
18. Impact of Common Variants of PPARG, KCNJ11, TCF7L2, SLC30A8, HHEX, CDKN2A, IGF2BP2, and CDKAL1 on the Risk of Type 2 Diabetes in 5,164 Indians
- Author
-
Chittaranjan S. Yajnik, Sreenivas Chavali, Smita R. Kulkarni, Rubina Tabassum, Om Prakash Dwivedi, Giriraj R. Chandak, Ganesh Chauhan, Seema Bhaskar, S. Prakash, M.V. Kranthi Kumar, Saurabh Ghosh, Nikhil Tandon, Dwaipayan Bharadwaj, Anubha Mahajan, and Charles J. Spurgeon
- Subjects
Male ,endocrine system diseases ,Endocrinology, Diabetes and Metabolism ,Genome-wide association study ,Type 2 diabetes ,0302 clinical medicine ,Reference Values ,Ethnicity ,Cation Transport Proteins ,Aged, 80 and over ,Genetics ,tRNA Methyltransferases ,0303 health sciences ,SLC30A8 ,RNA-Binding Proteins ,Middle Aged ,3. Good health ,Female ,TCF Transcription Factors ,Transcription Factor 7-Like 2 Protein ,medicine.medical_specialty ,Genotype ,India ,030209 endocrinology & metabolism ,Single-nucleotide polymorphism ,Zinc Transporter 8 ,Biology ,White People ,03 medical and health sciences ,Internal medicine ,Internal Medicine ,medicine ,Humans ,Potassium Channels, Inwardly Rectifying ,CDKAL1 ,Cyclin-Dependent Kinase Inhibitor p16 ,Aged ,030304 developmental biology ,Genetic association ,Homeodomain Proteins ,Genetic Variation ,nutritional and metabolic diseases ,Cyclin-Dependent Kinase 5 ,Odds ratio ,medicine.disease ,PPAR gamma ,Diabetes Mellitus, Type 1 ,Endocrinology ,Diabetes Mellitus, Type 2 ,biology.protein ,TCF7L2 ,Genome-Wide Association Study ,Transcription Factors - Abstract
OBJECTIVE Common variants in PPARG, KCNJ11, TCF7L2, SLC30A8, HHEX, CDKN2A, IGF2BP2, and CDKAL1 genes have been shown to be associated with type 2 diabetes in European populations by genome-wide association studies. We have studied the association of common variants in these eight genes with type 2 diabetes and related traits in Indians by combining the data from two independent case–control studies. RESEARCH DESIGN AND METHODS We genotyped eight single nucleotide polymorphisms (PPARG-rs1801282, KCNJ11-rs5219, TCF7L2-rs7903146, SLC30A8-rs13266634, HHEX-rs1111875, CDKN2A-rs10811661, IGF2BP2-rs4402960, and CDKAL1-rs10946398) in 5,164 unrelated Indians of Indo-European ethnicity, including 2,486 type 2 diabetic patients and 2,678 ethnically matched control subjects. RESULTS We confirmed the association of all eight loci with type 2 diabetes with odds ratio (OR) ranging from 1.18 to 1.89 (P = 1.6 × 10−3 to 4.6 × 10−34). The strongest association with the highest effect size was observed for TCF7L2 (OR 1.89 [95% CI 1.71–2.09], P = 4.6 × 10−34). We also found significant association of PPARG and TCF7L2 with homeostasis model assessment of β-cell function (P = 6.9 × 10−8 and 3 × 10−4, respectively), which looked consistent with recessive and under-dominant models, respectively. CONCLUSIONS Our study replicates the association of well-established common variants with type 2 diabetes in Indians and shows larger effect size for most of them than those reported in Europeans.
- Published
- 2010
- Full Text
- View/download PDF
19. Obesity-dependent association of TNF-LTA locus with type 2 diabetes in North Indians
- Author
-
Ganesh Chauhan, Rubina Tabassum, Anubha Mahajan, Nikhil Tandon, Dwaipayan Bharadwaj, Sreenivas Chavali, and Om Prakash Dwivedi
- Subjects
Male ,medicine.medical_specialty ,Genotype ,Population ,India ,Type 2 diabetes ,Biology ,White People ,Insulin resistance ,Internal medicine ,Drug Discovery ,medicine ,Humans ,Obesity ,Allele ,Promoter Regions, Genetic ,education ,Lymphotoxin-alpha ,Genetics (clinical) ,Aged ,education.field_of_study ,Tumor Necrosis Factor-alpha ,Middle Aged ,medicine.disease ,Minor allele frequency ,Endocrinology ,Diabetes Mellitus, Type 2 ,Genetic Loci ,Molecular Medicine ,Female ,Metabolic syndrome ,Body mass index - Abstract
Six common genetic variants (rs2229094, rs1041981, rs1800630, rs1800629, rs361525, and rs1800610) in the TNF-LTA locus encoding the pro-inflammatory cytokines tumor necrosis factor-alpha (TNF-α) and lymphotoxin-α have been shown to be associated with various metabolic traits including susceptibility to type 2 diabetes, metabolic syndrome, insulin resistance, and increased body mass index (BMI) in Caucasians from different geographic locations and have yielded mixed results. We tested for the association of these variants with type 2 diabetes in North Indians by studying 2,115 participants comprising of 1,073 type 2 diabetes patients and 1,042 controls. We report the association of a promoter region variant of TNF: rs1800630 and non-synonymous LTA variant: rs2229094 with type 2 diabetes [OR = 0.83 (95% CI 0.72–0.95), P = 0.005 and OR = 0.86 (95% CI 0.75–0.98), P = 0.02, respectively]. Although these associations were BMI-dependent, no interactive effect of BMI and variants on type 2 diabetes was detectable. Further, the haplotype carrying all the six major alleles conferred susceptibility to type 2 diabetes [OR = 1.23 (95% CI 1.06–1.42), P = 0.005; P permuted = 0.02], with the effect much enhanced in non-obese subjects [OR = 1.45 (95% CI 1.19–1.78), P = 2 × 10−4: P permuted = 3 × 10−4]. The minor allele of rs2229094 was associated with lower hsCRP, BMI, and waist circumference (WC), while the minor allele of rs1800630 showed association with lower BMI and WC (all P
- Published
- 2010
- Full Text
- View/download PDF
20. Genetic variants of FOXA2: risk of type 2 diabetes and effect on metabolic traits in North Indians
- Author
-
Nikhil Tandon, Dwaipayan Bharadwaj, Rubina Tabassum, Sreenivas Chavali, and Om Prakash Dwivedi
- Subjects
Adult ,Blood Glucose ,Male ,medicine.medical_specialty ,Genotype ,India ,Locus (genetics) ,Single-nucleotide polymorphism ,Type 2 diabetes ,Biology ,Polymerase Chain Reaction ,Risk Factors ,Internal medicine ,Genetics ,medicine ,Humans ,Insulin ,Genetic Predisposition to Disease ,Obesity ,Allele ,Genetics (clinical) ,Polymorphism, Genetic ,C-Peptide ,Middle Aged ,medicine.disease ,Endocrinology ,Diabetes Mellitus, Type 2 ,Genetic epidemiology ,Statistical genetics ,Case-Control Studies ,Hepatocyte Nuclear Factor 3-beta ,Female ,Pharmacogenetics - Abstract
Here, we examined the association of genetic variants of FOXA2, an upstream activator of the beta-cell transcription factor network, with type 2 diabetes and related phenotypes in North India. We genotyped three SNPs (rs1212275, rs1055080, rs6048205) and the (TCC)( n ) repeat polymorphism in 1,656 participants comprising 1,031 patients with type 2 diabetes and 625 controls. SNPs rs1212275 and rs6048205 were uncommon (MAF5%) with similar distribution among patients and controls. We found a strong association of (TCC)( n ) common allele A5 with type 2 diabetes [OR = 1.66 (95% CI 1.36-2.04, p = 5.9 x 10(-7)) for A5 homozygotes]. Obese individuals with A5A5 genotype had enhanced risk when segregated from normal-weight subjects [OR = 1.92 (95% CI 1.47-2.51), p = 1.6 x 10(-6)]. A5 was also nominally associated with higher fasting glucose (p = 0.02) and lower fasting insulin (p = 0.0028) and C-peptide (p = 0.036) levels among controls. At the rs1055080 locus, GG was found to provide reduced risk among normal-weight subjects [OR = 0.59 (95% CI 0.40-0.88), p = 0.011]. Combination of protective GG and non-risk genotypes of (TCC)( n ) showed reduced risk of type 2 diabetes both among normal-weight [OR = 0.43 (95% CI 0.29-0.65), p = 1.2 x 10(-6)] and obese individuals [0.47 (95% CI 0.34-0.64), p = 4.3 x 10(-5)]. For the first time we demonstrated that FOXA2 variants may affect risk of type 2 diabetes and metabolic traits in North India, however replication analyses in other cohorts are required to confirm the findings.
- Published
- 2008
- Full Text
- View/download PDF
21. Common Variants of Homocysteine Metabolism Pathway Genes and Risk of Type 2 Diabetes and Related Traits in Indians
- Author
-
Rubina Tabassum, Ismeet Kaur, Om Prakash Dwivedi, Saurabh Ghosh, Ganesh Chauhan, Nikhil Tandon, and Dwaipayan Bharadwaj
- Subjects
Adult ,Blood Glucose ,Male ,lcsh:Internal medicine ,medicine.medical_specialty ,Candidate gene ,Hyperhomocysteinemia ,lcsh:Specialties of internal medicine ,Homocysteine ,Article Subject ,Endocrinology, Diabetes and Metabolism ,lcsh:Medicine ,India ,Type 2 diabetes ,Biology ,lcsh:Diseases of the endocrine glands. Clinical endocrinology ,Polymorphism, Single Nucleotide ,chemistry.chemical_compound ,lcsh:RC581-951 ,Risk Factors ,Internal medicine ,medicine ,Humans ,Risk factor ,lcsh:RC31-1245 ,Genetic Association Studies ,Methylenetetrahydrofolate Reductase (NADPH2) ,lcsh:RC648-665 ,lcsh:R ,Cholesterol, HDL ,Case-control study ,Genetic Variation ,General Medicine ,Middle Aged ,medicine.disease ,Obesity ,Endocrinology ,Cholesterol ,chemistry ,Diabetes Mellitus, Type 2 ,Case-Control Studies ,Population study ,Female ,Metabolic Networks and Pathways ,Research Article - Abstract
Hyperhomocysteinemia, a risk factor for cardiovascular disorder, obesity, and type 2 diabetes, is prevalent among Indians who are at high risk of these metabolic disorders. We evaluated association of common variants of genes involved in homocysteine metabolism or its levels with type 2 diabetes, obesity, and related traits in North Indians. We genotyped 90 variants in initial phase (2.115 subjects) and replicated top signals in an independent sample set (2.085 subjects). The variantMTHFR-rs1801133 was the top signal for association with type 2 diabetes (OR=0.78(95% CI=0.67–0.92),P=0.003) and was also associated with 2 h postload plasma glucose (P=0.04), high-density lipoprotein cholesterol (P=0.004), and total cholesterol (P=0.01) in control subjects. These associations were neither replicated nor significant after meta-analysis. Studies involving a larger study population and different ethnic groups are required before ruling out the role of these important candidate genes in type 2 diabetes, obesity, and related traits.
- Published
- 2012
- Full Text
- View/download PDF
22. Evaluation of DOK5 as a susceptibility gene for type 2 diabetes and obesity in North Indian population
- Author
-
Rubina Tabassum, Ganesh Chauhan, Nikhil Tandon, Dwaipayan Bharadwaj, Om Prakash Dwivedi, Saurabh Ghosh, and Anubha Mahajan
- Subjects
lcsh:Internal medicine ,medicine.medical_specialty ,lcsh:QH426-470 ,Chromosomes, Human, Pair 20 ,India ,030209 endocrinology & metabolism ,Single-nucleotide polymorphism ,Type 2 diabetes ,Polymorphism, Single Nucleotide ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,Genetics ,medicine ,Humans ,Genetics(clinical) ,Genetic Predisposition to Disease ,Obesity ,lcsh:RC31-1245 ,Genetics (clinical) ,Adaptor Proteins, Signal Transducing ,030304 developmental biology ,Genetic association ,2. Zero hunger ,0303 health sciences ,Polymorphism, Genetic ,biology ,Haplotype ,Metabolic disorder ,Case-control study ,medicine.disease ,3. Good health ,lcsh:Genetics ,Insulin receptor ,Endocrinology ,Diabetes Mellitus, Type 2 ,Case-Control Studies ,biology.protein ,Research Article - Abstract
Background Type 2 diabetes is a complex metabolic disorder with obesity being a major contributing factor in its development. Susceptibility loci for type 2 diabetes and obesity have been localized on different chromosomal regions by various genome-wide linkage scans. Of these chromosomal regions, 20q13 is one of the strongest linked regions for type 2 diabetes as well as obesity. On 20q13 lies DOK5 that seems to be a strong functional and positional candidate for type 2 diabetes and obesity because of its involvement in insulin signaling and immune responses. Hence, for the first time, we explored DOK5 as a potential type 2 diabetes and obesity susceptibility gene. Methods We sequenced 43 subjects for polymorphisms in functionally relevant regions of DOK5. A total of 10 SNPs that included 5 that were identified by sequencing and 5 additional SNPs from NCBI Variation Database were genotyped in 2,115 participants comprising of 1,073 patients with type 2 diabetes and 1,042 controls of Indo-European ethnicity from North India. Results We identified a novel variant in intron 7 referred to as DK176673. We found nominal association of three SNPs-rs6064099 (OR = 0.75, P = 0.019), rs873079 (OR = 0.76, P = 0.036) and DK176673 (OR = 1.55, P = 0.037) with type 2 diabetes among normal-weight subjects [BMI < 23 kg/m2]. The haplotype GGC harboring rs6068916, rs6064099 and rs873079 showed strong association with type 2 diabetes among normal-weight subjects (OR = 1.37, P/P perm = 5.8 × 10-3/0.037). Association analysis with obesity revealed that rs6064099 is associated with reduced susceptibility for obesity (OR = 0.48, P = 6.8 × 10-3). Also, haplotype GGC conferred increased susceptibility for obesity (OR = 1.27, P/P perm = 9.0 × 10-3/0.039). Also, rs6064099 was significantly associated with reduced BMI [median(IQR) = 24.0(20.7-27.1) vs 23.9(20.2-26.8) vs 21.8(19.2-24.7) for GG vs GC vs CC, P = 7.0 × 10-3]. Conclusions We identified DOK5 as a novel susceptibility gene for obesity and type 2 diabetes in North Indian subjects. Association of DOK5 variants both with obesity and type 2 diabetes suggests that these variants might modulate type 2 diabetes susceptibility through obesity.
- Published
- 2010
- Full Text
- View/download PDF
23. No association of TNFRSF1B variants with type 2 diabetes in Indians of Indo-European origin
- Author
-
Nikhil Tandon, Saurabh Ghosh, Dwaipayan Bharadwaj, Rubina Tabassum, Ganesh Chauhan, Bratashree Kundu, Himanshu Dubey, Vasudha Sharma, Om Prakash Dwivedi, and Anubha Mahajan
- Subjects
Adult ,Male ,Linkage disequilibrium ,medicine.medical_specialty ,lcsh:Internal medicine ,lcsh:QH426-470 ,India ,Single-nucleotide polymorphism ,Genome-wide association study ,Type 2 diabetes ,Biology ,Polymorphism, Single Nucleotide ,Gastroenterology ,Linkage Disequilibrium ,White People ,Risk Factors ,Internal medicine ,medicine ,Genetics ,Humans ,Receptors, Tumor Necrosis Factor, Type II ,Genetic Predisposition to Disease ,Genetics(clinical) ,lcsh:RC31-1245 ,Genetics (clinical) ,Genetic association ,Haplotype ,Case-control study ,Middle Aged ,medicine.disease ,lcsh:Genetics ,Diabetes Mellitus, Type 2 ,Case-Control Studies ,Population study ,Female ,Genome-Wide Association Study ,Research Article - Abstract
Background There has been no systematic evaluation of the association between genetic variants of type 2 receptor for TNFα (TNFR2) and type 2 diabetes, despite strong biological evidence for the role of this receptor in the pathogenesis of this complex disorder. In view of this, we performed a comprehensive association analysis of TNFRSF1B variants with type 2 diabetes in 4,200 Indo-European subjects from North India. Methods The initial phase evaluated association of seven SNPs viz. rs652625, rs496888, rs6697733, rs945439, rs235249, rs17883432 and rs17884213 with type 2 diabetes in 2,115 participants (1,073 type 2 diabetes patients and 1,042 control subjects). Further, we conducted replication analysis of three associated SNPs in 2,085 subjects (1,047 type 2 diabetes patients and 1,038 control subjects). Results We observed nominal association of rs945439, rs235249 and rs17884213 with type 2 diabetes (P < 0.05) in the initial phase. Haplotype CC of rs945439 and rs235249 conferred increased susceptibility for type 2 diabetes [OR = 1.19 (95%CI 1.03-1.37), P = 0.019/P perm = 0.076] whereas, TG haplotype of rs235249 and rs17884213 provided protection against type 2 diabetes [OR = 0.83 (95%CI 0.72-0.95, P = 7.2 × 10-3/P perm = 0.019]. We also observed suggestive association of rs496888 with plasma hsCRP levels [P = 0.042]. However, the association of rs945439, rs235249 and rs17884213 with type 2 diabetes was not replicated in the second study population. Meta-analysis of the two studies also failed to detect any association with type 2 diabetes. Conclusions Our two-stage association analysis suggests that TNFRSF1B variants are not the determinants of genetic risk of type 2 diabetes in North Indians.
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.