Simultaneous single-base resolution profiling of 5mC and 5hmC using BRIGHT-seq

Area of Science:

• Epigenetics
• Genomics
• Molecular Biology

Background:

• Cytosine modifications, 5-methylcytosine (5mC) and 5-hydroxymethylcytosine (5hmC), are crucial epigenetic marks.
• Understanding their interplay requires simultaneous, base-resolution detection.
• Current methods often use differential subtraction, complicating concurrent analysis.

Purpose of the Study:

• To develop a sequencing strategy for direct, simultaneous detection of 5mC and 5hmC.
• To enable single-base resolution analysis of both modifications within the same DNA molecule.
• To overcome limitations of differential subtraction methods.

Main Methods:

• Introduced Base Replacement for Integrated Genome-wide Methylation and Hydroxymethylation Tracking Sequencing (BRIGHT-seq).
• Integrated enzymatic and chemical treatments to convert 5mC to adenine and 5hmC to thymine.
• Enabled direct identification of both modifications without subtraction.

Main Results:

• BRIGHT-seq allows direct, simultaneous mapping of 5mC and 5hmC landscapes.
• Achieved single-base resolution detection within the same DNA molecule.
• Demonstrated applicability across human and mouse genomes.

Conclusions:

• BRIGHT-seq is a high-resolution sequencing tool for epigenetic research.
• Facilitates direct analysis of 5mC and 5hmC interplay.
• Supports future studies on epigenetic roles in gene regulation and disease.