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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
07:50

Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer

Published on: September 18, 2020

Roles and causes of abnormal DNA methylation in gastrointestinal cancers

Hiromu Suzuki1, Minoru Toyota, Hironobu Sato

  • 1Department of Public Health, Sapporo Medical University, S1, W16, Sapporo, 060-8543, Japan. hsuzuki@sapmed.ac.jp

Asian Pacific Journal of Cancer Prevention : APJCP
|July 15, 2006
PubMed

Insights

Epigenetic changes, like DNA methylation, are key in gastrointestinal cancers. Understanding these patterns, influenced by factors like aging and diet, may lead to new cancer prevention strategies.

Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Epigenetic abnormalities, specifically DNA methylation alterations, are increasingly recognized as critical in gastrointestinal cancer development and progression.
  • Two primary DNA methylation abnormalities observed in cancer are genome-wide hypomethylation and promoter-specific CpG island hypermethylation.

Purpose of the Study:

  • To explore the role of DNA methylation abnormalities in gastrointestinal malignancies.
  • To understand the mechanisms by which global hypomethylation and regional hypermethylation contribute to cancer.
  • To investigate the influence of aging, cancer-specific methylation patterns (CIMP), and epidemiological factors on aberrant DNA methylation.

Main Methods:

  • Review of current evidence on DNA methylation patterns in gastrointestinal cancers.
  • Analysis of the functional consequences of global hypomethylation and regional hypermethylation.
  • Examination of recently developed techniques for detecting DNA methylation changes.

Main Results:

  • Global hypomethylation may promote proto-oncogene activation and chromosomal instability.
  • Regional hypermethylation silences tumor suppressor genes involved in cell cycle, DNA repair, growth signaling, angiogenesis, and apoptosis.
  • Aging is a contributor to aberrant methylation, with cancer-specific patterns identified in a subset of tumors (CIMP).

Conclusions:

  • Aberrant DNA methylation is a hallmark of gastrointestinal cancers, impacting multiple cellular processes.
  • Epidemiological factors, such as dietary folate intake and genetic polymorphisms in folate metabolism, may influence these epigenetic changes.
  • Identifying these factors is crucial for developing future cancer prevention strategies.

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