The Cumulative Formation of R-loop Interacts with Histone Modifications to Shape Cell Reprogramming

Area of Science:

• Molecular Biology
• Epigenetics
• Genomics

Background:

• R-loops (RNA/DNA structures) are vital for genome stability and gene expression.
• The precise role of R-loops in cell reprogramming is not fully understood.

Purpose of the Study:

• To comprehensively profile the genome-wide R-loop landscape during cell reprogramming.
• To elucidate the molecular mechanisms of R-loops in facilitating cell fate transitions.

Main Methods:

• Genome-wide profiling of R-loop formation.
• Analysis of R-loop correlation with gene expression.
• Investigation of R-loop dynamics alongside histone modifications (H3K4me3, H3K27me3) and transcriptional regulatory networks (TRN).

Main Results:

• R-loop formation on repetitive elements is stage-specific during reprogramming.
• A subset of R-loops positively correlates with gene expression and dynamic turnover is linked to pluripotent TRN activation.
• R-loop regions show increased H3K4me3 and decreased H3K27me3, indicating active chromatin states.

Conclusions:

• R-loops play a dynamic role in cell reprogramming by influencing gene expression and chromatin states.
• The interplay between R-loops and histone modifications (HMs) is critical for controlling cell reprogramming and cell fate transitions.