Related Experiment Video
Updated: May 27, 2026
09:52
Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging
Published on: January 31, 2019
Physics-based nucleosome-resolution modeling of epigenetic-driven chromatin domain dynamics
Chenyang Gu1, Shoji Takada1, Giovanni B Brandani1
1Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
Nucleic Acids Research
|May 26, 2026
Summary
Epigenetics shapes chromatin structure, influencing gene regulation. Our physics-based model reveals how nucleosome interactions create dynamic, liquid-like domains that facilitate gene interactions in stem cells.
Area of Science:
- Genomics
- Molecular Biology
- Computational Biology
Background:
- Chromatin organization is crucial for eukaryotic genome function, including gene regulation.
- The precise interplay between epigenetics, chromatin structure, and cellular function remains incompletely understood.
Purpose of the Study:
- To develop a nucleosome-resolution coarse-grained model of chromatin organization.
- To investigate the influence of epigenetic modifications on chromatin structure and dynamics.
- To explore the formation of functional genomic domains in mouse embryonic stem cells.
Main Methods:
- Developed a coarse-grained model for chromatin organization across multiple scales.
- Simulated nucleosome dynamics, chromatin fiber folding, and liquid-liquid phase separation.
- Applied the model to study active loci (Pou5f1, Sox2) in mouse embryonic stem cells, incorporating epigenetic factors like histone modifications and specific proteins (BRD4).
Main Results:
- Simulations demonstrated that chromatin folds into dynamic, liquid-like domains characterized by similar histone modifications.
- These domains promote transient contacts between distant cis-regulatory elements.
- In silico mutation studies elucidated the specific roles of individual epigenetic factors in chromatin organization.
Conclusions:
- Epigenetic-dependent nucleosome interactions are fundamental drivers of functional genomic locus organization.
- The developed model provides a computationally efficient tool for studying chromatin dynamics at the nucleosome level.
- Physics-based modeling offers insights into how epigenetic marks translate into higher-order chromatin structure and function.
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