{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Histone H3 – including its canonical forms and specialized variants – is a central orchestrator of chromatin dynamics that integrates diverse cellular processes through its post‐translational modifications, deposition pathways, and variant‐specific functions. Acetylation, methylation, phosphorylation, proteolytic processing, and ubiquitylation of H3 modulate its structure and interactions, thereby governing DNA replication, repair, transcription, and higher order chromatin assembly. For example, acetylation of H3 (e.g. at lysine 56 and 23) promotes timely nucleosome assembly after DNA synthesis and repair by recruiting and coordinating the action of specific histone chaperones such as ASF1, CAF‐1, HIRA, NASP, and DAXX, which in turn ensure correct recycling of parental histones and incorporation of new ones."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": " Variant-specific deposition, as seen with H3.3 and the centromere-specific CENP-A, underlies specialized roles in transcriptional activation, cell reprogramming, and maintenance of centromere identity and kinetochore function."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "13"}]}, {"type": "t", "text": " Moreover, aberrant H3 modification patterns and misregulated histone chaperone activity have been linked to oncogenic processes, where altered H3 acetylation and methylation states drive proliferation, invasion, and metastasis by reprogramming gene expression profiles."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "17"}]}, {"type": "t", "text": " Collectively, these studies demonstrate that through its regulated deposition and modification, histone H3 functions not only as a structural element for packaging the genome but also as an active signal integrator that connects DNA‐templated processes with cellular fate decisions in development and disease.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Chandrima Das, M Scott Lucia, Kirk C Hansen, et al. 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