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This organization regulates the physical accessibility of the genome to gene transcription, replication, and repair regulatory factors. Chromatin compaction is controlled by multivalent weak interactions, resulting in a complicated conformational landscape that remains challenging to characterize. This work reports a method for characterizing chromatin compaction, Free Energy Spectroscopy (FES), which is based on DNA nanotechnology and transmission electron microscopy. This method experimentally determines the chromatin compaction free energy landscape in terms of end-to-end distance and nucleosome stacking interactions. By deconvolving the free energy landscapes of partially and fully compact tetranucleosomes, FES revealed three separate mechanisms by which linker histones reshape the compaction energetics to condense chromatin. This study establishes FES as a method with the potential to help answer a broad range of mechanistic questions about genome and epigenome function.<\/jats:p>","DOI":"10.1093\/nar\/gkag723","type":"journal-article","created":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T11:41:10Z","timestamp":1784029270000},"source":"Crossref","is-referenced-by-count":0,"title":["Free energy spectroscopy reveals the mechanistic landscape of chromatin compaction"],"prefix":"10.1093","volume":"54","author":[{"given":"Kalven","family":"Bonin","sequence":"first","affiliation":[{"name":"Department of Physics, The Ohio State University , Columbus, OH 43210 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuchen","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Aerospace Engineering, The Ohio State University , Columbus, OH 43210 ,","place":["United 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