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Updated: May 18, 2026

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

Methylated BNIP3 gene in colorectal cancer prognosis

Sayaka Shimizu1, Satoru Iida, Megumi Ishiguro

  • 1Department of Surgical Oncology, Tokyo Medical and Dental University, Tokyo 113-8519, Japan.

Oncology Letters
|September 12, 2012
PubMed

Insights

DNA methylation of the BNIP3 gene is linked to poorer outcomes and resistance to irinotecan (CPT-11) chemotherapy in colorectal cancer (CRC) patients. This finding identifies BNIP3 methylation as a potential biomarker for predicting treatment response and prognosis in CRC.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • DNA methylation of apoptosis-related genes disrupts cancer cell death pathways, leading to chemotherapy resistance.
  • Irinotecan (CPT-11) is a vital treatment for metastatic colorectal cancer (CRC), but patient response varies significantly.
  • Identifying genetic markers for CPT-11 resistance is crucial for improving CRC patient outcomes.

Purpose of the Study:

  • To identify apoptosis-related genes involved in CPT-11 resistance in colorectal cancer.
  • To investigate the role of DNA methylation in regulating these genes and influencing CPT-11 response.
  • To evaluate Bcl-2/adenovirus E1B 19 kDa protein interacting protein 3 (BNIP3) methylation as a predictive biomarker for CRC prognosis and CPT-11 treatment.

Main Methods:

  • Microarray analysis was performed on colon cancer cells treated with 5-aza-2'deoxycytidine (DAC) to enhance CPT-11 sensitivity, identifying differentially expressed apoptosis-related genes.
  • Promoter methylation analysis was conducted on identified genes, focusing on BNIP3.
  • Clinical data from 112 primary CRC cases and 30 patients receiving CPT-11 chemotherapy were analyzed to correlate BNIP3 methylation with patient prognosis and treatment response.

Main Results:

  • Microarray analysis revealed 10 apoptosis-related genes upregulated by DAC, including BNIP3.
  • BNIP3 promoter methylation was identified as a mechanism contributing to CPT-11 resistance.
  • Approximately 58% of primary CRC cases exhibited BNIP3 methylation, associated with poorer outcomes.
  • Patients with BNIP3 methylation showed significantly higher resistance to CPT-11 chemotherapy compared to those without methylation.

Conclusions:

  • Promoter methylation of BNIP3 is implicated in the development of CPT-11 resistance in colorectal cancer.
  • BNIP3 methylation serves as a potential predictive biomarker for both prognosis and response to CPT-11 chemotherapy in CRC patients.
  • Targeting BNIP3 methylation could offer new therapeutic strategies for overcoming CPT-11 resistance in CRC.

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