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Longitudinal DNA methylation differences precede type 1 diabetes.

Randi K Johnson1, Lauren A Vanderlinden2, Fran Dong3

  • 1University of Colorado Anschutz Medical Campus, Division of Biomedical Informatics and Personalized Medicine, Aurora, CO, USA.

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Summary
This summary is machine-generated.

DNA methylation patterns change differently with age in children who develop type 1 diabetes (T1D). These epigenetic differences appear even before disease onset, suggesting a role in T1D development.

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Area of Science:

  • Epigenetics
  • Immunology
  • Endocrinology

Background:

  • DNA methylation's role in type 1 diabetes (T1D) is suggested, but prior studies lacked pre-disease data.
  • Epigenome-wide association studies (EWAS) in T1D have been limited to clinically diagnosed cases.

Purpose of the Study:

  • To investigate longitudinal DNA methylation differences in pre-disease peripheral blood samples from individuals who later developed T1D.
  • To identify epigenetic markers associated with T1D development before clinical diagnosis and preclinical islet autoimmunity.

Main Methods:

  • Utilized Illumina 450K and EPIC platforms for DNA methylation analysis.
  • Analyzed multiple pre-disease blood samples from 87 T1D cases and 87 matched controls in the prospective DAISY cohort.
  • Employed longitudinal analysis to track methylation changes over time and compare cases with controls.

Main Results:

  • Identified 10 genomic regions with differing methylation changes over time between T1D cases and controls.
  • Found 28 regions and 2 genomic positions with significant average longitudinal methylation differences between cases and controls.
  • Observed some methylation differences detectable from birth, preceding preclinical islet autoimmunity and clinical diagnosis.

Conclusions:

  • Longitudinal DNA methylation differences in peripheral blood may precede T1D onset and islet autoimmunity.
  • Epigenetic alterations, specifically DNA methylation, could play a role in the pathogenesis of type 1 diabetes.
  • Further functional studies are necessary to validate the role of identified methylation differences in T1D development.