methyl-ATAC-seq measures DNA methylation at accessible chromatin

Area of Science:

• Genomics
• Epigenetics
• Molecular Biology

Background:

• Genome-wide assays like ATAC-seq and BS-seq characterize chromatin features such as open chromatin and DNA methylation.
• Analyzing these features separately hinders the precise determination of their co-localization within the genome.
• Overlaying independent datasets can lead to uncertainty regarding the coincident occurrence of distinct chromatin states.

Purpose of the Study:

• To develop a single, integrated protocol for simultaneously assessing open chromatin and DNA methylation.
• To overcome the limitations of analyzing independent chromatin feature assays.
• To unambiguously determine the co-occurrence of open chromatin and DNA methylation at specific genomic locations.

Main Methods:

• Modification of the ATAC-seq protocol to incorporate BS-seq.
• Development of methyl-ATAC-seq (mATAC-seq) for combined chromatin accessibility and DNA methylation profiling.
• Application of mATAC-seq to analyze the interplay between nucleosome depletion and DNA methylation.

Main Results:

• mATAC-seq successfully integrates ATAC-seq and BS-seq into a single workflow.
• The method unambiguously identifies genomic regions with both open chromatin and specific DNA methylation states.
• Simultaneous profiling eliminates the need for separate assays and inferential data merging.

Conclusions:

• mATAC-seq provides a powerful combinatorial approach for comprehensive epigenomic analysis.
• This method enhances the accuracy and efficiency of studying chromatin feature co-localization.
• mATAC-seq facilitates a deeper understanding of the functional relationships between chromatin accessibility and DNA methylation.