Cited by 301Pancreatic function and diabetesEpigenetics and DNA MethylationDiabetes and associated disorders

Increased DNA methylation and decreased expression of PDX-1 in pancreatic islets from patients with type 2 diabetes

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Yang, Beatrice T., Dayeh, Tasnim A., Volkov, Petr A., Kirkpatrick, Clare L., Malmgren, Siri, Jing, Xingjun, Renström, Erik, Wollheim, Claes B. +2 more·2012·Molecular Endocrinology

Abstract

Mutations in pancreatic duodenal homeobox 1 (PDX-1) can cause a monogenic form of diabetes (maturity onset diabetes of the young 4) in humans, and silencing Pdx-1 in pancreatic β-cells of mice causes diabetes. However, it is not established whether epigenetic alterations of PDX-1 influence type 2 diabetes (T2D) in humans. Here we analyzed mRNA expression and DNA methylation of PDX-1 in human pancreatic islets from 55 nondiabetic donors and nine patients with T2D. We further studied epigenetic regulation of PDX-1 in clonal β-cells. PDX-1 expression was decreased in pancreatic islets from patients with T2D compared with nondiabetic donors (P = 0.0002) and correlated positively with insulin expression (rho = 0.59, P = 0.000001) and glucose-stimulated insulin secretion (rho = 0.41, P = 0.005) in the human islets. Ten CpG sites in the distal PDX-1 promoter and enhancer regions exhibited significantly increased DNA methylation in islets from patients with T2D compared with nondiabetic donors. DNA methylation of PDX-1 correlated negatively with its gene expression in the human islets (rho = -0.64, P = 0.0000029). Moreover, methylation of the human PDX-1 promoter and enhancer regions suppressed reporter gene expression in clonal β-cells (P = 0.04). Our data further indicate that hyperglycemia decreases gene expression and increases DNA methylation of PDX-1 because glycosylated hemoglobin (HbA1c) correlates negatively with mRNA expression (rho = -0.50, P = 0.0004) and positively with DNA methylation (rho = 0.54, P = 0.00024) of PDX-1 in the human islets. Furthermore, while Pdx-1 expression decreased, Pdx-1 methylation and Dnmt1 expression increased in clonal β-cells exposed to high glucose. Overall, epigenetic modifications of PDX-1 may play a role in the development of T2D, given that pancreatic islets from patients with T2D and β-cells exposed to hyperglycemia exhibited increased DNA methylation and decreased expression of PDX-1. The expression levels of PDX-1 were further associated with insulin secretion in the human islets.

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Crossref · 10.1210/me.2012-1004

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  • Hyperglycemia alters DNA methylation of PDX1 and INS.

    “further suggest that hyperglycemia alters DNA methylation of PDX1 and INS ( 22 – 25 ).”

    From β-Cell Failure in Type 2 Diabetes: Postulated Mechanisms and Prospects for Prevention and Treatment (2014) · cites this paper as [22]

    The 'Impact of hyperglycemia on DNA methylation of PDX-1' section (page not supplied) reports that HbA1c correlated with PDX-1 methylation in human islets and that high glucose nominally increased Pdx-1 methylation in rat β-cells. The paper does not present a corresponding finding that hyperglycemia alters INS methylation; its Discussion mentions insulin-promoter methylation in patients with type 2 diabetes as a finding from earlier work. (LLM, conf=0.85)

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Authors
Yang, B. T., Dayeh, T. A., Volkov, P. A., Kirkpatrick, C. L., Malmgren, S., Jing, X., Renström, E., Wollheim, C. B., Nitert, M. D., & Ling, C.
Affiliations
  • Lund University (SE)
  • Department of Cell Physiology and Metabolism (C.L.K., C.B.W.), University Medical Center, 1211 Geneva 4, Switzerland
Corresponding author
Ling, Charlotte
Venue
Molecular Endocrinology
Published
2012-07-01
Volume
26
Issue
7
Pages
1203-1212
ISSN
  • 0888-8809 (ISSN-L)
  • 1944-9917
OpenAlex
W2116017402
Cited by
301
References
50
Citations by year
2026: 13 · 2025: 14 · 2024: 25 · 2023: 20 · 2022: 18 · 2021: 21 · 2020: 26 · 2019: 24 · 2018: 18 · 2017: 21 · 2016: 18 · 2015: 25 · 2014: 32 · 2013: 19 · 2012: 6
FWCI
26.78
Type
journal article
Language
en
Open access
Locations
  • Molecular Endocrinology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Archive ouverte UNIGE (University of Geneva) (publishedVersion, other-oa)
  • Lund University Publications (Lund University) (submittedVersion, other-oa)
  • Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
Funders
  • National Science Foundation
  • Eli Lilly and Company
  • European Foundation for the Study of Diabetes (B31 5631/2006)
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
  • Lunds Universitet
  • Knut och Alice Wallenbergs Stiftelse
  • Novo Nordisk
  • Vetenskapsrådet
  • Uppsala Universitet
  • Università di Pisa
  • Region Skåne
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
Keywords
PDX1, DNA methylation, type 2 diabetes, pancreatic islets, pancreatic beta cells, epigenetic regulation, hyperglycemia, HbA1c, DNMT1, insulin secretion, gene silencing
MeSH terms
Diabetes Mellitus, Type 2, Female, Glucose, Humans, Hyperglycemia, Insulin, Male, Middle Aged, Pancreas, Promoter Regions, Genetic, RNA, Messenger, Trans-Activators, Homeodomain Proteins, DNA Methylation, Insulin-Secreting Cells

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