{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Histone H2BC12L, a member of the histone H2B family, plays critical roles in maintaining chromatin structure and regulating gene expression. As a core component of the nucleosome, it helps to organize and stabilize DNA packaging; alterations in its sequence or post‐translational modifications (e.g., phosphorylation, acetylation, and formylation) can compromise nucleosome integrity and influence local chromatin accessibility. For instance, cancer‐associated mutations in H2B (such as an E76K substitution) distort the interaction between H2B and H4, resulting in nucleosome instability that contributes to oncogenic transformation and altered cell proliferation dynamics."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Furthermore, dynamic regulation of H2B deposition and turnover has been linked to key cellular processes including transcriptional memory and cell cycle progression. Signal transduction pathways—such as those mediated by protein kinase C theta—can affect H2B deposition on chromatin, thereby modulating the expression of genes involved in rapid transcriptional responses in activated lymphocytes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " In addition, fusions of H2B to fluorescent reporters have been exploited to monitor cell cycle speeds in living cells, underscoring its utility as a marker of chromatin dynamics during proliferation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In several cancer settings, aberrant expression of H2B gene family members that are closely related to H2BC12L has been observed. Elevated levels of certain H2B variants (for example, HIST1H2BK) are associated with poor prognosis and have been incorporated into gene signatures that distinguish disease subtypes and predict metastatic behavior in glioma and colorectal cancer."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Moreover, coordinated expression of H2B-related transcripts alongside other tumor suppressor or oncogenic transcripts has been linked to differential outcomes in childhood leukemias, highlighting a potential role in modulating the balance between cell proliferation and apoptosis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, H2BC12L contributes to the epigenetic regulation of gene expression through its fundamental role in chromatin organization and nucleosome stability. Its dysregulation—whether through mutation, post-translational modification, or altered expression—can disrupt normal gene regulatory networks, thereby influencing cell cycle progression, differentiation, and tumorigenesis.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yasuhiro Arimura, Masae Ikura, Risa Fujita, et al. 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