Near-atomistic simulations reveal the molecular principles that control chromatin structure and phase separation.

Near-atomistic simulations with OpenCGChromatin reveal how linker-DNA length and modifications like acetylation control chromatin structure and phase separation at large scales.

• Why it matters: Understanding chromatin organization is vital for decoding genome function, yet experimental limitations hinder insights into molecular interactions and dynamics.
• What they did: The study developed OpenCGChromatin, a high-performance coarse-grained model capable of simulating chromatin systems tens of kilobases long, predicting structures and stability from physicochemical principles.
• The result: Simulations uncovered how linker-DNA length influences histone-tail accessibility and condensate architecture, and showed that specific modifications like H4K16 and H3K9 weaken interactions, disrupting chromatin compaction.