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DNA Methylation: Bisulphite Modification and Analysis
Published on: October 21, 2011
Global methylation profiles in DNA from different blood cell types
Hui-Chen Wu1, Lissette Delgado-Cruzata, Julie D Flom
1Department of Epidemiology, Mailman School of Public Health of Columbia University, New York, NY, USA.
Epigenetics
|October 5, 2010
Summary
Global DNA methylation analysis in white blood cells (WBC) is common in cancer studies. However, results vary significantly depending on the DNA source and the specific assay used for measurement.
Area of Science:
- Epigenetics
- Molecular Biology
- Cancer Research
Background:
- DNA methylation in white blood cell (WBC) DNA is increasingly utilized in cancer susceptibility studies.
- Limited knowledge exists regarding the correlation between different global methylation assays and the impact of DNA source on methylation profiles across various blood cell types.
Purpose of the Study:
- To compare DNA methylation levels across different repetitive elements (LINE1, Sat2, Alu) using three distinct assays (MethyLight, LUMA, [(3)H]-methyl acceptance).
- To evaluate the influence of DNA source (granulocytes, WBC, mononuclear cells, lymphoblastoid cell lines) on global DNA methylation measurements.
- To assess the correlation between different methylation assays within various DNA sources.
Main Methods:
- Utilized data from 620 women, with DNA samples from granulocytes (Gran) and total white blood cells (WBC).
- Analyzed DNA methylation for LINE1, Sat2, and Alu repetitive elements using MethyLight, LUMA, and [(3)H]-methyl acceptance assays.
- Compared methylation levels across four DNA sources: WBC, Gran, mononuclear cells (MN), and lymphoblastoid cell lines (LCL) in a subset of 48 women.
Main Results:
- For most assays, DNA methylation in granulocytes (Gran) did not correlate with methylation in other cell types (LCL, MN, WBC), with Sat2 being an exception.
- DNA methylation in lymphoblastoid cell lines (LCL) showed correlations with mononuclear (MN) and WBC DNA for specific assays ([(3)H]-methyl acceptance, LINE1, Alu).
- Methylation in MN DNA correlated with WBC DNA for the [(3)H]-methyl acceptance and LUMA assays.
- Assay comparisons within each DNA source revealed significant positive correlations (0.3-0.7), except for Sat2 and Alu in MN.
- Correlations among assays were highest for the three repetitive elements (0.39-0.64) when stratified by DNA source in 620 women.
- LUMA assay results showed modest correlations with LINE1 (0.18-0.20).
Conclusions:
- Both the assay method and the DNA source are critical factors influencing the interpretation of global DNA methylation patterns derived from white blood cells (WBC).
- Researchers must carefully consider assay selection and DNA source when designing studies on epigenetic modifications in blood.
- The findings highlight the heterogeneity of DNA methylation across different blood components and the need for standardized methodologies.
