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Alu Methylation Patterns in Type 1 Diabetes: A Case-Control Study.

Andromachi Katsanou1,2, Charilaos A Kostoulas3, Evangelos Liberopoulos4

  • 1Department of Endocrinology, University of Ioannina, 45110 Ioannina, Greece.

Genes
|December 23, 2023
PubMed
Summary

Type 1 diabetes (T1D) patients show higher partial Alu methylation, linked to HbA1c levels. This epigenetic pattern differs based on age at T1D diagnosis, suggesting a role in diabetes complications.

Keywords:
Alu retroelementDNA methylationType 1 diabetes

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Endocrinology

Background:

  • Genome-wide hypomethylation is implicated in diabetic complications and genomic instability.
  • Limited data exist on Alu methylation patterns in type 1 diabetes (T1D).
  • Alu elements are repetitive DNA sequences sensitive to methylation changes.

Purpose of the Study:

  • To investigate DNA methylation levels and patterns of Alu methylation in T1D patients.
  • To compare Alu methylation between T1D patients and healthy controls.
  • To explore correlations between Alu methylation, HbA1c, and age at diagnosis.

Main Methods:

  • COmbined Bisulfite Restriction Analysis (COBRA) was used to analyze peripheral blood DNA.
  • 36 patients with T1D and 29 age- and sex-matched healthy controls were included.
  • Quantification of total Alu methylation rate (mC) and specific methylation patterns (mCuC, uCmC, mCmC, uCuC) was performed.

Main Results:

  • Total Alu methylation rates were similar between T1D patients and controls.
  • T1D patients exhibited significantly higher levels of partial Alu methylation (mCuC + uCmC).
  • Partial Alu methylation correlated positively with HbA1c levels and differed based on age at T1D diagnosis.

Conclusions:

  • While total Alu methylation is unchanged, partial Alu methylation patterns are elevated in T1D.
  • Increased partial Alu methylation is associated with glycemic control (HbA1c) in T1D.
  • Epigenetic alterations in Alu methylation may contribute to T1D pathogenesis and complications.