Data analysis of experimentally solved nucleosome arrays reveals heterogeneous features.

Heterogeneous geometrical features in experimentally solved nucleosome arrays vary with linker DNA length, core histone variants, auxiliary protein binding, and fiber interdigitation, while average neighbor geometry remains usable.

• Why it matters: Regular, designed-sequence fiber structures need quantitative characterization that complements in vivo organization data and supports modeling of chromatin architecture.
• What they did: The authors analyzed atomic-resolution nucleosome array structures, extracting coarse-grained parameters such as relative nucleosome orientation/positioning and linker DNA opening, and provided a web resource for analysis.
• The result: Simulations using average parameters reproduce experimental fiber geometries reasonably, suggesting these averaged features can support mesoscale modeling and modular design of chromatin fibers.

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