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Accumulation of aberrant DNA methylation during colorectal cancer development

Eiji Sakai1, Atsushi Nakajima1, Atsushi Kaneda1

  • 1Eiji Sakai, Atsushi Nakajima, Department of Gastroenterology, Yokohama City University School of Medicine, Yokohama 236-0027, Japan.

World Journal of Gastroenterology
|February 28, 2014
PubMed

Insights

DNA methylation patterns classify colorectal cancer (CRC) subtypes and may predict cancer risk. This epigenetic mechanism is crucial for early detection and personalized treatment strategies for colorectal cancer.

Area of Science:

  • Epigenetics
  • Molecular Oncology
  • Cancer Genomics

Background:

  • Colorectal cancer (CRC) remains a leading cause of cancer mortality despite therapeutic advances.
  • CRC development involves accumulating genetic and epigenetic alterations, notably gene silencing via aberrant DNA methylation.
  • DNA methylation plays a critical role in the epigenetic landscape of colorectal cancer.

Purpose of the Study:

  • To review the role of DNA methylation in classifying colorectal cancer (CRC).
  • To explore the potential clinical utility of DNA methylation as biomarkers for CRC diagnosis, prognosis, and therapy response.
  • To discuss how DNA methylation patterns in normal colonic mucosa may predict individual CRC risk.

Main Methods:

  • Genome-wide methylation analyses to classify sporadic CRC into distinct epigenotypes.
  • Analysis of methylation patterns in precursor lesions (adenomas) and normal colonic mucosa.
  • Review of existing literature on DNA methylation and CRC.

Main Results:

  • Sporadic CRC can be categorized into distinct epigenotypes, each associated with specific genetic alterations, indicating different carcinogenic pathways.
  • Precursor lesions like conventional and serrated adenomas exhibit methylation accumulation similar to CRC, aligning with these epigenotypes.
  • Aberrant DNA methylation occurs early, even in normal colonic mucosa, suggesting its potential for predicting CRC risk.

Conclusions:

  • DNA methylation is a key epigenetic mechanism driving CRC development and classification.
  • Epigenotypes identified through methylation analysis offer insights into distinct molecular pathways of CRC.
  • DNA methylation holds significant promise as a biomarker for early diagnosis, prognosis prediction, and guiding therapy response in colorectal cancer.
Keywords:
Aberrant crypt fociColorectal adenomaColorectal cancerColorectal carcinogenesisDNA methylationEpigenotypeGenetic mutation

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