MINE is a method for detecting spatial density of regulatory chromatin interactions based on a multi-modal network

Area of Science:

• Molecular Biology
• Genomics
• Biophysics

Background:

• Chromatin interactions are crucial for 3D genome organization and gene regulation.
• Existing tools for analyzing regulatory chromatin interactions (RCIs) are limited, especially for spatial density analysis.
• Understanding spatial density of regulatory chromatin interactions (SD-RCI) is key to deciphering gene expression control.

Purpose of the Study:

• To introduce the multi-modal network (MINE) toolkit for analyzing SD-RCI.
• To enable quantitative investigation of chromatin conformation and regulatory activity.
• To explore the relationship between SD-RCI and chromatin volume changes.

Main Methods:

• Development of the MINE toolkit, comprising MINE-Loop for RCI detection, MINE-Density for SD-RCI quantification, and MINE-Viewer for 3D visualization.
• Application of MINE to HeLa cells undergoing liquid-liquid phase separation induced by 1,6-hexanediol.
• Analysis of changes in SD-RCI and chromatin volume before and after treatment.

Main Results:

• The MINE toolkit successfully quantified SD-RCI and visualized chromatin interactions in 3D.
• Observed changes in SD-RCI correlated with chromatin volume alterations in HeLa cells.
• Treatment-induced changes in SD-RCI suggest a link between chromatin organization and gene activation/repression.

Conclusions:

• The MINE toolkit provides novel capabilities for quantitative analysis of chromatin conformation and regulatory interactions.
• Changes in SD-RCI are associated with dynamic alterations in chromatin organization and gene expression.
• MINE facilitates deeper insights into the spatial regulation of gene activity.