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Updated: May 4, 2026

Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer

Published on: September 18, 2020

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Reduced mRNA expression levels of MBD2 and MBD3 in gastric carcinogenesis

Thaís Brilhante Pontes1, Elizabeth Suchi Chen, Carolina Oliveira Gigek

  • 1Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740 - Ed. Leitão da Cunha - 1ºandar, São Paulo, 04023-900, SP, Brazil.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|December 17, 2013
PubMed

Insights

Reduced expression of methyl-CpG-binding domain (MBD) proteins MBD2 and MBD3 is linked to gastric cancer development. DNA methylation appears to play a minor role in regulating these genes in gastric carcinogenesis.

Area of Science:

  • Molecular Oncology
  • Epigenetics
  • Gastric Carcinogenesis

Background:

  • Aberrant DNA methylation is a hallmark of various cancers, including gastric cancer.
  • Methyl-CpG-binding domain (MBD) proteins are crucial for chromatin remodeling and gene expression regulation.
  • The specific roles of MBD2 and MBD3 in gastric carcinogenesis remain incompletely understood.

Purpose of the Study:

  • To investigate the messenger RNA (mRNA) levels and promoter methylation patterns of MBD2 and MBD3 in gastric tissues.
  • To evaluate the association between MBD2 and MBD3 expression and clinicopathological characteristics in gastric cancer.
  • To elucidate the potential role of DNA methylation in regulating MBD2 and MBD3 expression during gastric carcinogenesis.

Main Methods:

  • Quantitative reverse transcription polymerase chain reaction (RT-qPCR) was used to determine MBD2 and MBD3 mRNA levels.
  • Bisulfite sequencing was employed to analyze the promoter methylation status of MBD2 and MBD3.
  • Samples included neoplastic gastric tissues, adjacent nonneoplastic tissues, gastritis, and non-gastritis tissues.

Main Results:

  • Significantly reduced MBD2 and MBD3 mRNA levels were observed in neoplastic gastric tissues compared to other groups.
  • Neoplastic tissues displayed higher MBD2 promoter methylation, while MBD3 promoter methylation was notable in the non-gastritis group.
  • A strong correlation was found between MBD2 and MBD3 expression levels, but a weak correlation between gene expression and promoter methylation.

Conclusions:

  • Reduced mRNA expression of MBD2 and MBD3 is implicated in gastric carcinogenesis.
  • DNA methylation appears to play a limited role in the direct regulation of MBD2 and MBD3 expression in this context.
  • Further research is warranted to fully understand the epigenetic mechanisms, including methylation at specific CpG sites, involved in gastric neoplasia.

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