DNA-methylome analysis of mouse intestinal adenoma identifies a tumour-specific signature that is partly conserved in human colon cancer
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Summary
This summary is machine-generated.Aberrant DNA methylation patterns in mouse intestinal adenomas reveal early epigenetic changes conserved in human colon cancer. These findings identify potential biomarkers for early tumor detection and understanding cancer development.
Area Of Science
- Epigenetics
- Cancer Biology
- Genomics
Background
- Aberrant CpG methylation is a hallmark of cancer genomes.
- Investigating early epigenetic changes during tumor development is challenging with human samples.
Purpose Of The Study
- To analyze the DNA methylome of mouse intestinal adenomas (APC(Min)) as a model for early intestinal cancer initiation.
- To identify differentially methylated regions (DMRs) characteristic of adenoma development.
- To compare epigenetic alterations in mouse adenoma with human colon cancer.
Main Methods
- Methylated DNA immunoprecipitation followed by sequencing (MeDIP-seq) to analyze the DNA methylome.
- Bisulfite pyrosequencing of purified cell populations.
- Bioinformatic analysis to identify recurring DMRs and enriched targets.
Main Results
- Over 13,000 recurring DMRs were identified in mouse intestinal adenomas.
- Hypermethylated DMRs were enriched for Polycomb Repressive Complex (PRC) targets, with up-regulation of PRC2 components and DNA methyltransferases.
- The observed DMR signature arises de novo in adenoma cells, not from stem or crypt cells.
- Epigenetic silencing of tumor suppressors was rare in adenoma.
- A core set of DMRs was conserved between mouse adenoma and human colon cancer.
Conclusions
- Early epigenetic alterations in intestinal adenoma are conserved and distinct from late stochastic events in cancer progression.
- These conserved DMRs may represent a global panel of epigenetically modified genes for intestinal tumors.
- The findings facilitate the selection of more specific clinical epigenetic biomarkers for early detection.