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An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues
Published on: April 5, 2018
Epigenetic markers of early tumor development
1Saba University School of Medicine, Saba Island and Georgetown University Medical School, Washington, DC, USA. rdumitre@jhsph.edu
Methods in Molecular Biology (Clifton, N.J.)
|February 24, 2012
Summary
Epigenetic changes, such as gene promoter hypermethylation, show promise for early cancer detection. Identifying these biomarkers can help assess cancer risk and susceptibility, improving patient outcomes.
Area of Science:
- Oncology
- Epigenetics
- Molecular Biology
Background:
- Early cancer diagnosis is crucial for patient survival and treatment efficacy.
- Current diagnostic methods have limitations.
- Epigenetic alterations are emerging as powerful tools for early cancer detection.
Purpose of the Study:
- To explore the role of epigenetic alterations, specifically DNA hypermethylation, in the early diagnosis of various cancers.
- To highlight specific genes and repetitive elements associated with tumorigenesis.
- To discuss potential influencing factors and the clinical utility of detecting these epigenetic changes.
Main Methods:
- Review of studies investigating epigenetic alterations (e.g., promoter hypermethylation) in different cancer types.
- Analysis of gene methylation patterns in breast, lung, prostate, and colorectal cancers.
- Examination of methylation changes in repetitive DNA elements.
Main Results:
- Promoter hypermethylation of genes (e.g., P16INK4a, BRCA1, APC, RASSF1A) is linked to early mammary gland tumorigenesis.
- P16INK4a and MGMT gene hypermethylation in sputum precedes clinical lung cancer manifestation in smokers.
- DNA hypermethylation of GSTP1, LINE-1, and Sat2 is observed in prostatic preneoplastic lesions.
- Hypermethylation of hMLH1 and MGMT DNA repair genes is found in colorectal cancer precursor lesions.
Conclusions:
- Epigenetic alterations, particularly DNA hypermethylation, are significant indicators of early cancer development across multiple cancer types.
- These epigenetic markers can aid in assessing individual cancer risk and susceptibility.
- Factors like xenoestrogens, folate, and multivitamins may influence these epigenetic changes, offering potential intervention points.
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