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Robert Häsler1, Zhe Feng, Liselotte Bäckdahl

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Epigenome-wide association studies reveal novel DNA methylation changes linked to ulcerative colitis (UC) risk. These findings, involving DNA methylation (DNAm) and gene expression, identify new molecular players in UC pathogenesis.

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Area of Science:

  • Genetics and Epigenetics
  • Gastroenterology
  • Immunology

Background:

  • The genetic basis of inflammatory bowel diseases, like ulcerative colitis (UC), is not fully understood.
  • Environmental factors are hypothesized to influence epigenetic modifications, contributing to UC development and progression.
  • DNA methylation (DNAm) is a key epigenetic mechanism regulating gene expression.

Purpose of the Study:

  • To investigate the role of DNA methylation in ulcerative colitis (UC) pathogenesis.
  • To identify novel UC risk loci through epigenome-wide association studies (EWAS).
  • To integrate DNAm data with gene expression profiles in affected tissues.

Main Methods:

  • Conducted a three-layer epigenome-wide association study (EWAS) using intestinal biopsies from monozygotic twin pairs discordant for UC.
  • Performed genome-wide expression scans, DNA methylation scans (identifying methylation variable positions - MVPs), and differentially methylated region (DMR) analysis.
  • Validated identified loci in independent patient cohorts using quantitative real-time PCR and bisulfite-pyrosequencing.

Main Results:

  • Identified 61 disease-associated loci with differential DNAm and gene expression in UC patients.
  • These loci represent novel candidate risk factors for UC, not previously identified by genome-wide association studies (GWAS).
  • Several identified genes, including CFI, SPINK4, and THY1, are implicated in inflammatory processes.

Conclusions:

  • This study provides the first replicated EWAS of UC integrated with transcriptional data.
  • EWAS can uncover previously unexplained genetic risk and molecular mechanisms underlying UC manifestation.
  • The findings highlight the importance of epigenetic modifications, specifically DNA methylation, in UC etiology.