{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe retinoblastoma‐1 (RB1) gene encodes a master regulator of cell cycle progression and differentiation. Its protein product safeguards the G1–S transition by binding and repressing E2F transcription factors, thereby enforcing irreversible cell cycle exit in senescence and promoting the formation of specialized heterochromatic foci that stably silence E2F‐responsive genes. In addition, RB1 functions to maintain proper transcriptional programs in diverse cell types, ensuring that proliferative signals are appropriately counterbalanced by differentiation and permanent cell‐cycle arrest. These roles have been elucidated in studies using human fibroblasts, genetically engineered cells, and in vivo models that have clarified the context‐dependent complexity of RB1 activity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRB1 activity is intricately modulated by post‐translational modifications and specific docking interactions that fine‐tune its tumor‐suppressive functions. Mono‐phosphorylation by cyclin D–Cdk4/6 early in G1—as well as subsequent hyper‐phosphorylation mediated by other cyclin–Cdk complexes—regulates its capacity to bind E2F partners. Moreover, RB1 is directly targeted by protein modifiers such as ubiquitin ligases (for example, Mdm2 and HPV16 E7–associated cullin complexes), and it is subject to lysine methylation events that influence its downstream binding to repressor proteins. These biochemical modifications, together with influences from noncoding RNAs that directly downregulate RB1 expression, underscore a multilayered regulation that impacts cell fate decisions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAberrations in RB1 function—through mutation, loss, or indirect downregulation—are closely linked to tumor progression and genomic instability across a broad spectrum of cancers. RB1 loss promotes a release of E2F-mediated transcription that can drive unscheduled proliferation, contribute to aneuploidy and chromosomal missegregation, and facilitate transitions to more aggressive or therapy‐resistant states. This has been documented in studies of prostate cancer, non–small‐cell lung cancer undergoing transformation into small‐cell lung cancer, hepatocellular carcinoma, retinoblastoma, colon cancer, melanoma, and pancreatic neoplasms. In these contexts, RB1 inactivation not only deregulates the cell cycle but also cooperates with alterations in other tumor suppressors (such as p53, PTEN, and p16^INK4a^) and oncogenic microRNA expression to exacerbate malignant progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "18", "end_ref": "40"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its canonical functions, RB1 plays a critical role in directing cell fate decisions and maintaining tissue identity. For instance, in the melanocyte lineage, RB1 cooperates with lineage-specific transcription factors to regulate G1 arrest and differentiation, while in epithelial cells its physical interactions contribute to the maintenance of E‐cadherin expression and the epithelial phenotype. Moreover, emerging studies indicate that epigenetic regulators such as KDM5B might intersect with RB1‐mediated transcriptional control, underscoring the broader network by which RB1 activity is integrated into cellular homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "41", "end_ref": "43"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Marie Classon, Ed Harlow "}, {"type": "b", "children": [{"type": "t", "text": "The retinoblastoma tumour suppressor in development and cancer."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Rev Cancer (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/nrc950"}], "href": "https://doi.org/10.1038/nrc950"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12459729"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12459729"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Masashi Narita, Sabrina Nũnez, Edith Heard, et al. 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