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DNA Methylation: Bisulphite Modification and Analysis
Published on: October 21, 2011
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An all-in-one strategy for bisulfite-free DNA methylation detection by temperature-programmed enzymatic reactions
Yunlong Liu1, Xiaoming Wang2, Yujiao Li3
1State Key Laboratory of Natural Medicines, Department of Biomedical Engineering, School of Engineering, China Pharmaceutical University, Nanjing, 211198, PR China.
Analytica Chimica Acta
|March 16, 2023
Summary
A novel temperature-programmed enzymatic method offers sensitive cell-free DNA methylation detection. This technique accurately quantifies methylation, showing potential for diagnosing colorectal cancer from plasma DNA.
Area of Science:
- Molecular Biology
- Epigenetics
- Biotechnology
Background:
- Cell-free DNA (cfDNA) is fragmented and present at low concentrations, challenging methylation detection.
- Conventional bisulfite conversion methods are inefficient for cfDNA methylation analysis due to complexity and DNA degradation.
Purpose of the Study:
- To develop a sensitive and accurate cfDNA methylation detection technology.
- To overcome limitations of existing methods for analyzing cfDNA methylation.
Main Methods:
- A single-tube, temperature-programmed enzymatic reaction was developed.
- Mild endonuclease recognition of DNA methylation minimizes cfDNA degradation.
- Two-stage amplification enhances detection sensitivity, particularly for GC-rich sequences.
Main Results:
- Achieved a detection sensitivity of 10 copies of methylated DNA for the vimentin gene.
- Accurately quantified methylation levels from a 1000-fold excess of unmethylated DNA.
- Successfully detected methylated vimentin in 20 clinical plasma samples, revealing significant differences between healthy individuals and colorectal cancer patients.
Conclusions:
- The proposed enzymatic method provides high sensitivity and accuracy for cfDNA methylation analysis.
- This technique demonstrates significant potential as a complementary approach to bisulfite conversion methods.
- The findings suggest clinical applicability for cfDNA methylation analysis in disease diagnosis, such as colorectal cancer.
