{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Replication‐dependent histone genes such as H2BC5 are critical components of the nucleosome and play an essential role in assembling chromatin and regulating gene expression. Post‐translational modifications of H2B proteins—including ubiquitylation, acetylation, and phosphorylation—help modulate RNA polymerase II engagement during transcription elongation, a process tightly controlled by kinases such as Cdk7."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In addition, experimental evidence shows that when regulatory factors like RGC‐32 are silenced, there is an increase in acetylation at specific lysine residues on histone H2B; such alterations in chromatin structure can accelerate cell‐cycle progression and potentially contribute to tumorigenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Consistent with this, several studies in cancer models have identified deregulation of histone H2B gene expression as a mechanism linked to chemotherapeutic resistance—for example, in breast cancer cells resistant to epirubicin, altered H2B expression appears to correlate with changes in apoptosis and proliferation dynamics."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Complementary transcriptomic analyses in other cancers have further highlighted modules of histone genes, including H2B variants, as prognostic markers, suggesting that mis‐regulation of these genes (and by extension, H2BC5) may impact disease progression and patient outcome."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, H2BC5, like other replication‐dependent H2B genes, contributes to the maintenance of chromatin structure and the regulation of gene transcription. Its post‐translational modification status is a key determinant of transcriptional fidelity and cell‐cycle progression, and dysregulation of H2B expression or modification may underlie drug resistance and cancer development. Such multifaceted roles position H2BC5 as both a potential biomarker and a therapeutic target in oncology and other disease settings.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Stéphane Larochelle, Ramon Amat, Kira Glover-Cutter, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Downregulation of histone H2A and H2B pathways is associated with anthracycline sensitivity in breast cancer."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Breast Cancer Res (2016)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1186/s13058-016-0676-6"}], "href": "https://doi.org/10.1186/s13058-016-0676-6"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "26852132"}], "href": "https://pubmed.ncbi.nlm.nih.gov/26852132"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Jie Xiong, Shengyu Guo, Zhitong Bing, et al. 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