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Updated: May 25, 2026
07:50
Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
Published on: September 18, 2020
DNA demethylation in normal colon tissue predicts predisposition to multiple cancers
H Kamiyama1, K Suzuki, T Maeda
1Department of Surgery, Saitama Medical Center, Jichi Medical University, Saitama, Japan.
Oncogene
|February 8, 2012
Summary
DNA hypomethylation in non-cancerous colonic mucosa predicts multiple colon cancers. This epigenetic biomarker is particularly relevant for younger patients and may indicate inherited predisposition.
Area of Science:
- Epigenetics and Cancer Biology
- Molecular Oncology
- Genomic Instability
Background:
- Colon cancer (CC) patients can develop single, synchronous, or metachronous tumors.
- Risk factors for non-hereditary CC with multiple tumors remain unclear.
- Previous research linked aging-associated DNA demethylation to genomic damage in CC.
Purpose of the Study:
- To investigate DNA hypomethylation extent in single vs. multiple CC patients.
- To assess the relationship between DNA hypomethylation, aging, and CC risk.
- To evaluate DNA hypomethylation as a predictive biomarker for multiple CC.
Main Methods:
- Real-time methylation-specific PCR used to quantify relative demethylation level (RDL) of LINE-1 sequences.
- Comparison of RDL in matched cancer tissues and non-cancerous colonic mucosa (NCM) from single and multiple CC patients.
- Multivariate logistic regression analyses to identify independent predictors of metachronous and multiple tumors.
Main Results:
- Higher LINE-1 demethylation (RDL) observed in NCM of synchronous and multiple CC patients compared to single CC patients.
- High NCM demethylation was a significant predictor for metachronous neoplasms and multiple CCs.
- LINE-1 demethylation in NCM showed an inverse correlation with age in multiple CC patients, and a positive correlation in single CC patients.
Conclusions:
- LINE-1 hypomethylation in non-cancerous colonic mucosa serves as an epigenetic predictive biomarker for multiple colon cancer risk.
- The association between NCM demethylation and multiple CC risk is stronger in younger patients, suggesting potential inherited predisposition.
- Epigenetic alterations in seemingly normal tissue can indicate a field cancerization effect and predict future tumor development.
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