From Nucleosomes to Compartments: Physicochemical Interactions Underlying Chromatin Organization

Area of Science:

• Molecular Biology
• Genetics
• Biophysics

Background:

• Chromatin organization is crucial for cellular function, regulating genetic information access.
• Studying chromatin folding is complex due to its multiscale and intricate nature.
• Progress has been made in vitro (nucleosome structure) and in vivo (chromosome-level organization).

Purpose of the Study:

• To review experimental and computational studies on chromatin folding at various length scales.
• To highlight the significance of intrinsic nucleosome interactions in chromatin folding.
• To bridge the gap between in vitro and in vivo chromatin studies.

Main Methods:

• Review of experimental studies across different length scales.
• Analysis of computational modeling approaches.
• Synthesis of findings from in vitro and in vivo investigations.

Main Results:

• In vitro studies reveal nucleosome structure and physicochemical forces.
• In vivo studies identify chromatin loops, TADs, and nuclear compartments.
• The relevance of internucleosomal interactions for in vivo folding remains under investigation.

Conclusions:

• Intrinsic nucleosome interactions are significant for chromatin folding in vivo.
• Further research is needed to reconcile in vitro and in vivo chromatin folding mechanisms.
• Bridging the gap between different scales is essential for a comprehensive understanding of chromatin organization.