Genomic methylation of leukocyte DNA in relation to colorectal adenoma among asymptomatic women
View abstract on PubMed
Summary
This summary is machine-generated.Lower genomic methylation in blood DNA is linked to reduced risk of colorectal adenoma (CRA) in women. This suggests a role for DNA methylation in early colorectal cancer development.
Area Of Science
- Oncology
- Epigenetics
- Molecular Biology
Background
- Systemic DNA methylation inhibition is a known carcinogen in animals, often via genetic instability.
- Epidemiologic data linking low systemic DNA methylation to human carcinogenesis, particularly colorectal cancer (CRC), is limited.
- Colorectal cancer's etiology involves genetic instability, making DNA methylation a relevant research area.
Purpose Of The Study
- To investigate the association between genomic methylation of leukocyte DNA and the risk of colorectal adenoma (CRA) in asymptomatic women.
- To explore potential links between systemic DNA methylation levels and early-stage colorectal neoplasia.
Main Methods
- A case-control study involving 115 pairs of CRA cases and matched controls from the CONCeRN Study.
- Genomic methylation of leukocyte DNA was quantified using liquid chromatography mass spectrometry.
- Conditional logistic regression analysis was employed to estimate odds ratios (OR) and confidence intervals (CI).
Main Results
- Women in the second and third tertiles of genomic methylation showed significantly lower odds of CRA compared to the lowest tertile (OR=0.72 and OR=0.17, respectively; P trend = .002).
- The inverse association was more pronounced for nonadvanced adenomas and proximal adenomas.
- A protective effect was observed with low total folate intake, but not with other nutrients or risk factors.
Conclusions
- Systemic genomic methylation levels may serve as a potential etiologic factor in the development of early-stage colorectal adenomas.
- These findings contribute to understanding the role of epigenetics in colorectal carcinogenesis.