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Updated: Feb 3, 2026
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Enhanced Reduced Representation Bisulfite Sequencing for Assessment of DNA Methylation at Base Pair Resolution
Published on: February 24, 2015
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Mirror Bisulfite Sequencing: A Method for Single-Base Resolution of Hydroxymethylcytosine
Darany Tan1, Tzu Hung Chung1, Xueguang Sun2,3
1Zymo Research Corporation , 17062 Murphy Avenue , Irvine , California 92614 , United States.
Analytical Chemistry
|October 23, 2018
Summary
This study introduces mirror bisulfite sequencing, a new method for detecting 5-hydroxymethylcytosine (5hmC) at single CpG sites. This technique enables genomewide mapping of 5hmC levels in human tissues.
Area of Science:
- Epigenetics and Genomics
- Molecular Biology
- Biotechnology
Background:
- The biological significance of 5-hydroxymethylcytosine (5hmC) remains largely unknown due to limitations in single-base detection methods.
- Existing techniques struggle to accurately quantify 5hmC at individual CpG sites, hindering comprehensive genomic studies.
Purpose of the Study:
- To develop and validate a novel method for precise, single-base resolution detection of 5-hydroxymethylcytosine (5hmC).
- To enable genomewide mapping of 5hmC distribution in various human tissues.
Main Methods:
- Developed 'mirror bisulfite sequencing' (MBS) for single-CpG site 5hmC detection.
- MBS involves synthesizing a complementary DNA strand and sequential enzymatic treatments (β-glucosyltransferase and M.SssI methylase).
- Differential methylation patterns after bisulfite conversion distinguish 5hmC sites from unmethylated or methylated cytosines.
Main Results:
- Successfully demonstrated 5hmC detection at single CpG resolution using MBS.
- Applied the method to map 5hmC levels across various human tissues.
- Generated genomewide 5hmC profiles, including in paired liver tissues.
Conclusions:
- Mirror bisulfite sequencing provides a powerful tool for accurate 5hmC detection at single-nucleotide resolution.
- This method facilitates comprehensive epigenomic studies of 5hmC in diverse biological contexts and disease states.
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