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Enhanced Reduced Representation Bisulfite Sequencing for Assessment of DNA Methylation at Base Pair Resolution
Published on: February 24, 2015
A modified protocol for bisulfite genomic sequencing of difficult samples.
Biological Procedures Online
|June 25, 2009
Summary
This study introduces a new method, multiple restriction enzyme digestion (MRED), to improve bisulfite sequencing for DNA methylation analysis. MRED significantly enhances the accuracy and reliability of results by reducing DNA degradation and improving conversion efficiency.
Area of Science:
- Epigenetics
- Molecular Biology
- Genetics
Background:
- Bisulfite genomic sequencing is a standard technique for DNA methylation analysis.
- The protocol suffers from DNA degradation and incomplete conversion, leading to unreliable results.
Purpose of the Study:
- To develop an improved method for bisulfite sequencing.
- To enhance the accuracy and reduce failure rates in DNA methylation analysis.
Main Methods:
- A single-step multiple restriction enzyme digestion (MRED) was incorporated into the bisulfite sequencing protocol.
- MRED selectively digests PCR products from unconverted DNA, preserving those from converted DNA.
Main Results:
- The MRED method increased informative sequencings ninefold for the RARB2 P2 promoter model system.
- MRED did not affect clonal representation in a methylated cell line (H-596), even when treated with a methylation inhibitor.
Conclusions:
- The MRED method offers a significant improvement for bisulfite sequencing, increasing data quality and reliability.
- This technique is adaptable for analyzing DNA methylation in other genes and provides guidance for enzyme selection.
