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A Self-Organized Liquid Reaction Container for Cellular Memory
Sukanta Mukherjee1,2, Enrico Skoruppa1,2, Holger Merlitz3
1Cluster of Excellence, Physics of Life, TU Dresden, Dresden, Germany.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 12, 2026
Summary
This study introduces a physical model where liquid-like droplets help restore epigenetic marks in heterochromatin, ensuring cell identity is maintained across cell divisions.
Area of Science:
- Cell Biology
- Epigenetics
- Biophysics
Background:
- Epigenetic inheritance maintains cell identity by stabilizing chromatin organization.
- Heterochromatin, a silent chromatin state, loses epigenetic marks during cell division.
Purpose of the Study:
- To propose a physical model for epigenetic mark restoration in heterochromatin.
- To investigate the role of biomolecular condensates in maintaining heterochromatin during cell division.
Main Methods:
- Developed a physical model based on biomolecular condensate (droplet) formation.
- Utilized polymer-assisted condensation (PAC) for heterochromatin-driven droplet formation.
- Employed particle-based simulations incorporating enzymatic reactions to model the cell cycle.
Main Results:
- Demonstrated that biomolecular condensates act as reaction chambers to reconstruct lost epigenetic marks.
- Showed that the proposed mechanism robustly stabilizes heterochromatin domains over multiple cell generations.
- Validated the model using an in silico cell cycle analogue.
Conclusions:
- Biomolecular condensates, via PAC, are crucial for restoring heterochromatic epigenetic marks.
- This mechanism ensures stable inheritance of heterochromatin and cell identity.
- The model suggests potential applications for other epigenetic marks.
