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Epigenetic variation and human disease.

Jean-Pierre Issa1

  • 1Department of Leukemia, The University of Texas at M.D. Anderson Cancer Center, Houston 77030, USA. jpissa@mdanderson.org

The Journal of Nutrition
|August 7, 2002
PubMed
Summary
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Epigenetic changes, specifically cytosine guanine dinucleotide (CpG) island methylation, increase with age and inflammation. This epigenetic variation influences disease risk and severity, highlighting its role in age-related conditions.

Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genomics

Background:

  • Cytosine guanine dinucleotide (CpG) island methylation is a key epigenetic mechanism in postmeiotic cells.
  • Epigenetic states influence cellular physiology, disease risk, and severity through chromatin changes and gene silencing.

Purpose of the Study:

  • To investigate age-related changes in CpG island methylation in normal colorectal mucosa.
  • To explore the impact of chronic inflammatory states on CpG island methylation.
  • To identify potential modulators of epigenetic variation, including lifestyle and environmental factors.

Main Methods:

  • Analysis of CpG island methylation in normal colorectal mucosa across different ages.
  • Examination of CpG island methylation in tissues affected by ulcerative colitis, hepatocellular cirrhosis, and neoplasia.

Related Experiment Videos

  • Assessment of preliminary data on lifestyle and exposure factors.
  • Main Results:

    • Progressive, age-related increases in CpG island methylation were observed at multiple gene loci in normal colorectal mucosa.
    • Significant increases in CpG island methylation were found in normal-appearing tissues associated with chronic inflammatory conditions.
    • Considerable inter-individual variation in methylation levels was noted, suggesting contributions from genetic, lifestyle, or environmental factors.

    Conclusions:

    • Epigenetic variation, driven by aging, inflammation, lifestyle, and genetic factors, plays a role in modulating age-related diseases, including neoplasia.
    • Proinflammatory exposures are a significant contributor to epigenetic variation in human populations.
    • CpG island methylation is a dynamic epigenetic mark influenced by multiple factors relevant to human health and disease.