{"gene":"RBL2","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2007,"finding":"RBL2/p130 forms a multisubunit protein complex called DREAM (DP, RB-like, E2F, and MuvB) containing mammalian homologs of C. elegans synMuvB proteins (LIN-9, LIN-37, LIN-52, LIN-54, LIN-53/RBBP4) and E2F4. DREAM binds to more than 800 human promoters in G0 and is required for repression of E2F target genes. In S phase, MuvB proteins dissociate from p130 and associate with MYB instead.","method":"Proteomics (mass spectrometry), ChIP-chip genomics, bioinformatics, co-immunoprecipitation","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — integrated proteomics, genomics, and functional assays in one rigorous study; evolutionarily conserved complex validated across multiple methods","pmids":["17531812"],"is_preprint":false},{"year":1995,"finding":"RBL2/p130 is a nuclear phosphoprotein; its phosphorylation is cell cycle regulated, reaching a peak at the onset of S-phase. It is one of the major targets of E1A viral oncoprotein-associated kinase activity, similar to p107.","method":"Immunocytochemistry, phosphatase treatment, biochemical characterization with polyclonal antibody against the spacer region","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical characterization with multiple methods (immunocytochemistry, phosphatase treatment, cell cycle analysis) in a single lab","pmids":["8567757"],"is_preprint":false},{"year":2002,"finding":"RBL2/p130 shuttles between nucleus and cytoplasm. Two independent nuclear localization signals (NLS) were identified in the C-terminus of p130, and an additional NLS was mapped within the unique Loop region. An N-terminal domain confers cytoplasmic localization. The intact pocket domain is sufficient for nuclear translocation. Removal of the entire N-terminus did not affect the ability of p130 to interact with E2F or to induce growth arrest.","method":"Heterokaryon fusion assay, transient transfection, microinjection, NLS mutagenesis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal methods (heterokaryon assay, microinjection, mutagenesis) in a single rigorous study","pmids":["11756542"],"is_preprint":false},{"year":2004,"finding":"Glycogen synthase kinase 3 (GSK3) phosphorylates RBL2/p130 during G0 quiescence at consensus GSK3 sites. GSK3 phosphorylation of p130 contributes to its stability but does not affect its ability to interact with E2F4 or cyclins.","method":"GSK3 small-molecule inhibitors, site-specific p130 mutants, phospho-specific antibodies","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis and phospho-specific antibodies, multiple orthogonal approaches in one study","pmids":["15456871"],"is_preprint":false},{"year":2003,"finding":"Protein phosphatase 2A (PP2A) associates with RBL2/p130 and dephosphorylates it, protecting p130 from ubiquitination and proteasomal degradation. This association is mediated by the NLS sequences in the C-terminus of Rb2/p130. CDK4 phosphorylation sites on p130 are among the candidate sites dephosphorylated by PP2A. ATRA-mediated growth suppression of ovarian carcinoma cells requires this PP2A–Rb2/p130 interaction.","method":"Co-immunoprecipitation, GST pulldown, siRNA knockdown of PP2A, Rb2/p130 mutant panel, ubiquitination assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — reciprocal Co-IP, GST pulldown, mutagenesis, and siRNA with functional readout, multiple orthogonal methods in one study","pmids":["12915404"],"is_preprint":false},{"year":2006,"finding":"PP2A catalytic subunit (PP2Ac) binds directly to the NLS sequences in the C-terminus of Rb2/p130. ATRA treatment leads to hypophosphorylation of PP2Ac (increased PP2A activity), which dephosphorylates the NLS of Rb2/p130, enabling importin alpha binding and nuclear translocation of Rb2/p130, leading to G1 arrest.","method":"Co-immunoprecipitation, truncation and NLS mutant transfection, cell growth assays, ATRA treatment","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mutant constructs showing functional consequence, single lab with multiple approaches","pmids":["16206244"],"is_preprint":false},{"year":2000,"finding":"Naturally occurring mutations disrupting the putative bipartite nuclear localization signal (NLS) of RBL2/p130 cause aberrant cytoplasmic localization of the protein. Site-directed mutagenesis of NLS residues markedly reduced biological activity (measured by cell cycle analysis), establishing the NLS as essential for p130 tumor suppressor function.","method":"SSCP, sequencing, site-directed mutagenesis, transfection, immunocytochemistry, Western blot, flow cytometry","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — site-directed mutagenesis with functional validation (flow cytometry cell cycle analysis) plus primary tumor data, multiple orthogonal methods","pmids":["10667591"],"is_preprint":false},{"year":1999,"finding":"RBL2/p130-mediated inhibition of smooth muscle cell proliferation correlates with its ability to bind and sequester E2F transcription factors. Adenovirus-mediated arterial delivery of RBL2/p130 significantly reduced neointimal hyperplasia in a rat carotid artery restenosis model.","method":"Adenoviral gene delivery, rat carotid artery angioplasty model, in vitro proliferation assay, E2F binding assays","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gene delivery with E2F binding as mechanistic correlate, single lab","pmids":["10571534"],"is_preprint":false},{"year":2001,"finding":"Overexpression of RBL2/p130 downregulates vascular endothelial growth factor (VEGF) expression both in vitro and in vivo, and inhibits angiogenesis in vivo, using a tetracycline-regulated expression system and retroviral/adenoviral delivery.","method":"Tet-regulated gene expression, retroviral and adenoviral gene delivery, VEGF protein measurement, in vivo angiogenesis assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple delivery systems (retroviral, adenoviral, Tet-inducible) converging on same phenotype, single lab","pmids":["11212232"],"is_preprint":false},{"year":2009,"finding":"Rb2/p130 is the dominant pocket protein mediating cellular senescence in a p53-p21-dependent manner. Knockdown of Rb2/p130 by RNAi allowed re-entry into S phase (cyclin A expression and DNA synthesis restored) in senescent cells. Overexpression of either p21 or p16 converged on Rb2/p130 accumulation to induce senescence. p53- or p21-negative cells failed to accumulate Rb2/p130 upon DNA damage and did not enter senescence.","method":"RNAi knockdown, cell cycle analysis (cyclin expression), overexpression of p21/p16, comparison across multiple cell lines","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi epistasis with direct cell cycle readout, replicated across multiple cell lines and conditions, two upstream pathway branches tested","pmids":["19648966"],"is_preprint":false},{"year":2006,"finding":"p53 cooperates selectively with p130/Rb2 to induce cellular senescence. Activation of temperature-sensitive p53 in p16-negative C6 glioma cells induces a switch in pocket protein expression from pRb/p107 to p130/Rb2, arresting cells in late G1/early S-phase. Maintenance of arrest depends on p130/Rb2 repressing cyclin A.","method":"Temperature-sensitive p53 mutant, stable transfection, cell cycle analysis (cyclin expression), immunofluorescence","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional epistasis using ts-p53 with cell cycle molecular readouts, single lab","pmids":["16123778"],"is_preprint":false},{"year":2000,"finding":"A CDE/CHR-like element in the mouse RBL2/p130 gene promoter mediates cell cycle-dependent transcriptional repression. This bipartite element makes major groove DNA contacts with proteins detectable in vivo, and inactivation of either CDE or CHR strongly upregulates p130 promoter activity in proliferating cells where endogenous p130 is nearly undetectable. Two different protein complexes bind independently to the CDE and CHR elements.","method":"Promoter deletion analysis, in vivo genomic footprinting, EMSA, luciferase reporter assays, site-directed mutagenesis","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo footprinting plus mutagenesis with functional reporter assays, single lab, multiple orthogonal methods","pmids":["10760507"],"is_preprint":false},{"year":2001,"finding":"The AP-2 transcription factor directly binds a KER1 palindromic sequence in the Rb2/p130 promoter and activates its transcription. AP-2 overexpression increased Rb2/p130 mRNA and protein; Rb2/p130 acts as a critical effector downstream of AP-2 in sustaining ectodermal/neuronal differentiation in PC12 cells.","method":"Promoter analysis, EMSA (in vitro AP-2 binding), transfection/overexpression, AP-2B dominant negative, NGF differentiation model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus functional overexpression/dominant-negative experiments, single lab","pmids":["11420667"],"is_preprint":false},{"year":2001,"finding":"HIV-1 Tat protein physically binds to pRb2/p130 in vitro and in vivo binding assays, potentially inactivating its oncosuppressive properties and inducing expression of cell cycle genes including p107, cyclin A, and cyclin B.","method":"In vitro and in vivo binding assays (co-immunoprecipitation)","journal":"Human pathology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct binding assay with functional correlation (cell cycle gene expression changes), single lab","pmids":["12196924"],"is_preprint":false},{"year":2001,"finding":"nm23 modulates the expression of Rb2/p130 gene during NGF-induced PC12 cell differentiation. nm23-H1 mutants defective in inhibiting invasion downregulate Rb2/p130 expression and inhibit NGF-induced differentiation, establishing an interplay between nm23 and Rb2/p130 in driving neuronal differentiation.","method":"Transfection of nm23 mutants, Western blot, neurite outgrowth assay, [3H]thymidine incorporation","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — epistasis via mutant overexpression with differentiation readout, single lab","pmids":["11423907"],"is_preprint":false},{"year":2017,"finding":"RBL2 interacts with the transcription factor E2F4 and binds to promoter regions of E2F target genes to repress them. Disruption of the RBL2/E2F4 complex by miR-17-5p overexpression shifts E2F activity from gene repression to activation, inducing cell cycle entry and proliferation in pancreatic cancer cells.","method":"Co-immunoprecipitation, ChIP, luciferase reporter assay, flow cytometry, miRNA overexpression/knockdown","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP demonstrating direct promoter binding, single lab with multiple orthogonal methods","pmids":["28987387"],"is_preprint":false},{"year":2018,"finding":"RBL2/p130 is a direct substrate of AKT kinase. AKT1 physically interacts with RBL2/p130 and phosphorylates it at Ser941 in the pocket domain; mutation of Ser941 to Ala abolishes AKT-mediated phosphorylation. Pharmacological AKT inhibition impairs RBL2 Ser941 phosphorylation, increases RBL2 stability and nuclear levels, and induces RBL2-dependent apoptosis in lung cancer and mesothelioma cells.","method":"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis (S941A), AKT inhibitor treatment, RBL2 silencing rescue experiments, flow cytometry","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis plus functional RBL2 silencing/rescue, multiple cell lines, single lab with orthogonal methods","pmids":["29606701"],"is_preprint":false},{"year":2021,"finding":"RBL2/p130 is a direct substrate of the SCF-cyclin F E3 ubiquitin ligase complex. Cyclin F binds a regulatory site in the flexible linker of the p130 pocket domain, and this site mediates binding, ubiquitination, and stability of p130. Expression of a ubiquitination-resistant p130 mutant severely impairs cell proliferation and cell cycle gene expression.","method":"CRISPR/Cas9 genetic screens, direct binding assay, ubiquitination assay, mutagenesis, quantitative iterative immunofluorescent imaging, transcript analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct ubiquitination reconstitution, site mapping by mutagenesis, and functional cell cycle readout, multiple orthogonal methods in one study","pmids":["34851822"],"is_preprint":false},{"year":2010,"finding":"Utx histone H3K27 demethylase directly regulates RBL2/p130 expression. Utx associates with the Rbl2 promoter, removes repressive H3K27 trimethylation, and increases active H3K4 trimethylation. Endogenous Utx is recruited to the Rbl2 promoter as shown by ChIP after siRNA knockdown.","method":"Chromatin immunoprecipitation (ChIP), siRNA knockdown, ectopic expression, histone methylation analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP showing promoter occupancy and histone marks, validated by endogenous Utx knockdown, single lab","pmids":["20650264"],"is_preprint":false},{"year":2011,"finding":"CTCF directly controls RBL2/p130 gene expression in lung fibroblasts by binding the Rb2/p130 promoter and establishing a local chromatin organization that governs transcriptional activity. In lung cancer cells, BORIS (a CTCF paralogue) competes with CTCF at the Rb2/p130 promoter, altering the chromatin state and impairing CTCF-mediated activation of Rb2/p130.","method":"ChIP, promoter binding assays, chromatin organization analysis, BORIS/CTCF overexpression, lung cancer cell proliferation assays","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct promoter binding, functional competition assay, single lab","pmids":["21325284"],"is_preprint":false},{"year":2011,"finding":"Loss of Rbl2/p130 in adult mice results in unscheduled proliferation of cochlear supporting cells and supernumerary inner ear hair cells and supporting cells in apical regions, with downregulation of cell cycle inhibitors, establishing p130 as a regulator of mitotic quiescence in cochlear supporting and hair cells.","method":"p130 knockout mouse analysis, cochlear histology, BrdU incorporation, cell cycle inhibitor expression analysis","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse with defined cellular phenotype and molecular mechanism (cell cycle inhibitor downregulation), single lab","pmids":["21677172"],"is_preprint":false},{"year":2010,"finding":"p130/Rb2 and Mirk/dyrk1B cooperatively mediate G0 quiescent arrest in ovarian cancer cells. Depletion of p130/Rb2 reduced the G0 fraction, increased cisplatin sensitivity, and reduced Mirk levels. p130/Rb2 forms complexes with E2F4 in G0-arrested cells.","method":"siRNA depletion, flow cytometry (G0 fraction), co-immunoprecipitation (p130/E2F4 complex), cell viability assays","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with functional G0/cell cycle and apoptosis readouts plus Co-IP, single lab","pmids":["20857490"],"is_preprint":false},{"year":2022,"finding":"RBL2/p130 represses FGFR1 expression; loss of RBL2 induces FGFR1 expression, and restoration of RBL2 represses it. In a mouse SCLC model, Fgfr1 knockout suppressed tumor development when Rbl2 was lost but not when Rbl2 was wild-type, placing RBL2 upstream of FGFR1 in a regulatory pathway.","method":"Fgfr1 knockout mouse crossed with Rbl2-deficient SCLC model, RBL2 restoration in cancer cell lines, gene expression analysis","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in mouse model plus cell line restoration experiments, single lab","pmids":["32973083"],"is_preprint":false},{"year":2022,"finding":"RBL2/p130 is a component of the DREAM repressor complex that represses Aurora kinase A/B pathway genes in a p53-dependent manner. Knockdown of p53, RBL2, or the DREAM component LIN37 increased AURKA/B pathway gene expression and reduced paclitaxel and radiation sensitivity in NSCLC cells.","method":"siRNA knockdown of RBL2, LIN37, p53; gene expression analysis; drug/radiation sensitivity assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi epistasis with expression and functional drug response readouts, single lab","pmids":["35058503"],"is_preprint":false},{"year":2017,"finding":"Downregulation of PARP1 in monocytes during differentiation-associated cell cycle exit involves assembly of an E2F4-RBL2-HDAC1-BRM(SWI/SNF) repressor complex at the PARP1 promoter that deacetylates nucleosomes and compacts chromatin. Silencing of RBL2 restored PARP1 expression and increased transcription of pluripotency factors (POU5F1, SOX2, NANOG) in monocytes.","method":"ChIP, RNAi knockdown, HDAC/EZH2 inhibitor treatment, reporter assays, chromatin compaction analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating promoter occupancy of E2F4-RBL2 complex plus RNAi functional validation, single lab","pmids":["28842672"],"is_preprint":false},{"year":2024,"finding":"The E2F1/4-pRb/RBL2 axis regulates WNT ligand expression (WNT7A, WNT7B, WNT10A, WNT4) in a cell-autonomous manner: E2F1 and E2F4 induce WNT expression while pRb/RBL2 represses it, thereby regulating cancer stem cell self-renewal, chemoresistance, and invasiveness through paracrine WNT signaling. The histone acetyltransferase GCN5 deposits H3K9ac on WNT promoters downstream of E2F.","method":"Quantitative proteomics of secreted proteins (CSC secretome), genetic manipulation of E2F/RB pathway, WNT expression analysis, epigenetic inhibitor screening, PDAC and breast cancer models","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative proteomics plus genetic manipulation with defined WNT expression readout, single lab but multiple cancer models","pmids":["38678032"],"is_preprint":false},{"year":2008,"finding":"In Dicer1-deficient mouse cells, Rbl2 protein accumulates and is responsible for decreased expression of Dnmt1, Dnmt3a, and Dnmt3b DNA methyltransferases, leading to global DNA hypomethylation and increased telomere recombination. The miR-290 cluster (downregulated in Dicer1-null cells) normally silences Rbl2 to maintain Dnmt expression.","method":"Dicer1 knockout cells, Dnmt overexpression rescue, methylation analysis, miR-290 re-expression, luciferase 3'UTR reporter assays","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis in knockout cells with rescue experiments (Dnmt overexpression, miR-290 re-expression), multiple orthogonal methods, reproduced across conditions","pmids":["18311151"],"is_preprint":false},{"year":2022,"finding":"HOXB9 transcriptionally upregulates RBL2 expression in pancreatic cancer cells. Upregulated RBL2 blocks cell cycle progression in G0/G1 and inhibits c-Myc. DNMT1 epigenetically silences HOXB9 by methylating its promoter, thus forming a DNMT1/HOXB9/RBL2/c-Myc axis regulating pancreatic cancer cell proliferation.","method":"Cell cycle PCR array, flow cytometry, ChIP-qPCR, luciferase reporter assay, xenograft and PDX mouse models, methylation analysis","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP showing direct promoter regulation, cell cycle and in vivo functional readouts, single lab with multiple methods","pmids":["35182659"],"is_preprint":false},{"year":2014,"finding":"TGF-β induces RBL2 expression in renal cancer cells by downregulating miR-93, which directly targets the RBL2 3'UTR. RBL2 mediates TGF-β-induced G1 growth arrest and cell cycle inhibition in these cells.","method":"qRT-PCR, Western blot, CCK-8 proliferation assay, PI staining (cell cycle), dual luciferase 3'UTR reporter assay, miR-93 overexpression/knockdown","journal":"Clinical & translational oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase 3'UTR validation plus functional epistasis (miR-93→RBL2→growth arrest), single lab","pmids":["25183046"],"is_preprint":false}],"current_model":"RBL2/p130 is a nuclear phosphoprotein that functions as a cell cycle repressor and tumor suppressor by forming the DREAM multisubunit complex (with E2F4 and MuvB subunits LIN-9/37/52/54/RBBP4) to silence hundreds of cell cycle-dependent genes in quiescence; its activity is regulated post-translationally by CDK-mediated phosphorylation (promoting inactivation), GSK3-mediated phosphorylation (stabilizing the protein), AKT-mediated phosphorylation at Ser941 (destabilizing the pocket domain), PP2A-mediated dephosphorylation at NLS sites (stabilizing p130 and enabling nuclear import), and SCF-cyclin F-mediated ubiquitination and degradation; it shuttles between nucleus and cytoplasm via defined NLS and cytoplasmic retention signals, represses VEGF and FGFR1 expression, cooperates with p53 to enforce senescence, and its expression is transcriptionally regulated by CTCF, AP-2, Utx H3K27 demethylase, and miRNA-mediated pathways (including miR-290 and miR-17 family)."},"narrative":{"mechanistic_narrative":"RBL2/p130 is a nuclear pocket-protein cell-cycle repressor that enforces quiescence and senescence by assembling the DREAM repressor complex with E2F4 and the MuvB subunits LIN-9/37/52/54 and RBBP4, which binds over 800 promoters in G0 to silence E2F target genes; in S phase the MuvB module dissociates from p130 and switches to MYB [PMID:17531812]. Its repressive output extends to specific gene programs including Aurora kinase A/B pathway genes via the DREAM/LIN37 module [PMID:35058503], the PARP1 promoter through an E2F4-RBL2-HDAC1-BRM(SWI/SNF) complex that compacts chromatin [PMID:28842672], and paracrine WNT ligands within an E2F/RB axis [PMID:38678032], while it also represses VEGF [PMID:11212232], FGFR1 [PMID:32973083], and the Dnmt methyltransferases [PMID:18311151]. p130 functions as the dominant pocket protein driving p53-p21-dependent senescence, accumulating downstream of p21 or p16 to repress cyclin A and block S-phase re-entry [PMID:19648966, PMID:16123778]. Its activity is set by a dense post-translational network: cell-cycle-regulated phosphorylation peaks at S-phase onset [PMID:8567757], GSK3 phosphorylation stabilizes the protein [PMID:15456871], AKT1 phosphorylates Ser941 in the pocket domain to destabilize it and limit nuclear accumulation [PMID:29606701], PP2A dephosphorylates C-terminal NLS sites to protect p130 from ubiquitination and enable importin-alpha-mediated nuclear import [PMID:12915404, PMID:16206244], and the SCF-cyclin F E3 ligase binds a site in the pocket-domain linker to ubiquitinate and degrade it [PMID:34851822]. Nucleocytoplasmic shuttling is governed by multiple C-terminal and Loop-region NLSs and an N-terminal cytoplasmic-retention domain, and natural NLS-disrupting mutations that mislocalize p130 to the cytoplasm abolish its tumor-suppressor cell-cycle-arrest activity [PMID:11756542, PMID:10667591]. RBL2 transcription is itself controlled by CTCF (antagonized by BORIS), AP-2, Utx-mediated H3K27 demethylation, HOXB9, and miRNA targeting of its 3'UTR (miR-290, miR-17, miR-93) [PMID:21325284, PMID:11420667, PMID:20650264, PMID:35182659, PMID:18311151, PMID:25183046].","teleology":[{"year":1995,"claim":"Established that p130 is a nuclear phosphoprotein whose phosphorylation is cell-cycle-coupled and targeted by viral oncoprotein-associated kinases, framing it as a regulated cell-cycle component rather than a static protein.","evidence":"Immunocytochemistry, phosphatase treatment, and biochemical cell-cycle analysis with a spacer-region antibody","pmids":["8567757"],"confidence":"Medium","gaps":["Specific kinases and phosphosites not yet defined","Functional consequence of phosphorylation peak not established"]},{"year":2000,"claim":"Showed that an intact NLS is essential for p130 nuclear localization and tumor-suppressor function, linking subcellular localization directly to cell-cycle-arrest activity.","evidence":"SSCP/sequencing of tumors, NLS site-directed mutagenesis, immunocytochemistry, and flow cytometry","pmids":["10667591"],"confidence":"High","gaps":["Import machinery not identified at this stage","Did not address upstream regulation of NLS"]},{"year":2000,"claim":"Identified a CDE/CHR promoter element that imposes cell-cycle-dependent repression of the RBL2 gene itself, revealing autoregulatory transcriptional control of p130 levels.","evidence":"In vivo genomic footprinting, EMSA, and luciferase reporters with mutagenesis (mouse promoter)","pmids":["10760507"],"confidence":"Medium","gaps":["Identity of CDE/CHR-binding complexes not determined","Element studied in mouse promoter only"]},{"year":2002,"claim":"Mapped the determinants of p130 nucleocytoplasmic shuttling, defining multiple NLSs, a cytoplasmic-retention N-terminus, and the pocket domain as sufficient for nuclear import and E2F-dependent growth arrest.","evidence":"Heterokaryon fusion, microinjection, and NLS mutagenesis in transfected cells","pmids":["11756542"],"confidence":"High","gaps":["Signals controlling shuttling dynamics not linked to upstream pathways here","Import receptor not yet identified"]},{"year":2003,"claim":"Defined PP2A as a stabilizing regulator that binds and dephosphorylates p130 at its C-terminal NLS, protecting it from ubiquitin-proteasomal degradation and linking dephosphorylation to growth suppression.","evidence":"Reciprocal Co-IP, GST pulldown, PP2A siRNA, mutant panel, and ubiquitination assays with ATRA growth readout","pmids":["12915404"],"confidence":"High","gaps":["Specific dephosphorylated residues only partially mapped","Connection to import machinery not yet shown"]},{"year":2004,"claim":"Demonstrated that GSK3 phosphorylation of p130 during G0 promotes its stability without altering E2F4 or cyclin binding, distinguishing stabilizing from inactivating phosphorylation events.","evidence":"GSK3 inhibitors, site-specific mutants, and phospho-specific antibodies in quiescent cells","pmids":["15456871"],"confidence":"High","gaps":["Mechanism by which phosphorylation confers stability not resolved","Interplay with PP2A and CDK sites not integrated"]},{"year":2006,"claim":"Connected PP2A-mediated NLS dephosphorylation to importin-alpha binding, providing a mechanistic route from phosphatase activity to nuclear translocation and G1 arrest.","evidence":"Co-IP, truncation/NLS mutants, and growth assays under ATRA in ovarian carcinoma cells","pmids":["16206244"],"confidence":"Medium","gaps":["Direct importin-alpha-p130 interaction shown in one system","Kinase counteracting PP2A at NLS not identified"]},{"year":2006,"claim":"Showed that p53 selectively cooperates with p130 to drive senescence via a pocket-protein switch and cyclin A repression, identifying p130 as the effector arm of p53-induced arrest.","evidence":"Temperature-sensitive p53, stable transfection, and cyclin-based cell-cycle analysis in p16-null glioma cells","pmids":["16123778"],"confidence":"Medium","gaps":["Generality beyond p16-null glioma context untested here","How p53 triggers the pocket-protein switch not defined"]},{"year":2009,"claim":"Established p130 as the dominant pocket protein for p53-p21-dependent senescence, with p16 and p21 converging on p130 accumulation and its knockdown permitting S-phase re-entry.","evidence":"RNAi epistasis, p21/p16 overexpression, and cyclin/DNA-synthesis readouts across multiple cell lines","pmids":["19648966"],"confidence":"High","gaps":["Molecular basis of p130 accumulation downstream of p21 not fully defined","Did not resolve DREAM-level mechanism"]},{"year":2007,"claim":"Defined the DREAM complex architecture, showing p130 partners with E2F4 and MuvB subunits to repress >800 promoters in G0 and that S-phase entry triggers MuvB dissociation and a switch to MYB.","evidence":"Mass spectrometry, ChIP-chip, bioinformatics, and Co-IP","pmids":["17531812"],"confidence":"High","gaps":["Signal triggering MuvB-p130 dissociation not mechanistically resolved","Promoter-selectivity determinants within the >800 targets unclear"]},{"year":2008,"claim":"Revealed a developmental/epigenetic role: miR-290-mediated silencing of Rbl2 sustains Dnmt expression, so Rbl2 accumulation in Dicer1-null cells causes DNA hypomethylation and telomere recombination.","evidence":"Dicer1-knockout cells, Dnmt rescue, miR-290 re-expression, and 3'UTR luciferase reporters","pmids":["18311151"],"confidence":"High","gaps":["Mechanism by which Rbl2 represses Dnmt genes not detailed","Relationship to DREAM repression not addressed"]},{"year":2017,"claim":"Showed that disrupting the RBL2-E2F4 promoter complex (via miR-17-5p) flips E2F activity from repression to activation, demonstrating that the complex's integrity gates proliferation.","evidence":"Co-IP, ChIP, luciferase reporters, and miRNA gain/loss with flow cytometry in pancreatic cancer cells","pmids":["28987387"],"confidence":"Medium","gaps":["Single cancer-cell context","Did not dissect full DREAM/MuvB involvement"]},{"year":2018,"claim":"Identified AKT1 as a kinase that directly phosphorylates p130 at Ser941 in the pocket domain to destabilize it and limit nuclear levels, defining a survival-signaling input that restrains p130-dependent apoptosis.","evidence":"Co-IP, in vitro kinase assay, S941A mutagenesis, AKT inhibition, and RBL2-silencing rescue across cancer lines","pmids":["29606701"],"confidence":"High","gaps":["Link between Ser941 phosphorylation and degradation machinery not defined","Interplay with PP2A/cyclin F not integrated"]},{"year":2021,"claim":"Defined the SCF-cyclin F E3 ligase as the degradation pathway for p130, mapping a cyclin F-binding site in the pocket-domain linker whose mutation impairs proliferation and cell-cycle gene expression.","evidence":"CRISPR screens, direct binding and ubiquitination assays, mutagenesis, and quantitative imaging","pmids":["34851822"],"confidence":"High","gaps":["Coordination with AKT/PP2A phospho-regulation not resolved","Cell-cycle timing of degradation only partially mapped"]},{"year":2022,"claim":"Extended DREAM target scope to therapy-relevant programs, showing p53/RBL2/LIN37-dependent repression of Aurora kinase A/B genes controls paclitaxel and radiation sensitivity.","evidence":"siRNA knockdown of RBL2/LIN37/p53 with expression and drug/radiation-response assays in NSCLC","pmids":["35058503"],"confidence":"Medium","gaps":["Direct DREAM occupancy of AURKA/B promoters not shown here","Single-lab cell-line data"]},{"year":2022,"claim":"Placed RBL2 upstream of FGFR1 in vivo, showing RBL2 loss induces FGFR1 and that Fgfr1 deletion suppresses tumorigenesis specifically when Rbl2 is lost, defining a tumor-suppressor effector pathway.","evidence":"Fgfr1-knockout cross with Rbl2-deficient SCLC mouse model plus cell-line restoration","pmids":["32973083"],"confidence":"Medium","gaps":["Whether FGFR1 repression is direct DREAM-mediated not shown","Mechanism of derepression upon RBL2 loss unclear"]},{"year":2024,"claim":"Showed the E2F1/4-pRb/RBL2 axis controls paracrine WNT ligand expression via GCN5-deposited H3K9ac, linking p130 repression to cancer stem-cell self-renewal and chemoresistance.","evidence":"Secretome proteomics, genetic E2F/RB manipulation, WNT expression, and epigenetic inhibitor screens in PDAC/breast models","pmids":["38678032"],"confidence":"Medium","gaps":["Direct RBL2 occupancy at WNT promoters not detailed","Relative contributions of pRb vs RBL2 not separated"]},{"year":null,"claim":"How the multiple, opposing post-translational inputs (CDK/AKT phosphorylation, GSK3-mediated stabilization, PP2A dephosphorylation, SCF-cyclin F degradation) are integrated to set p130 abundance, localization, and DREAM occupancy at specific promoters across the cell cycle remains 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RB-related gene Rb2/p130 in neuroblastoma differentiation and in B-myb promoter down-regulation.","date":"1998","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/10200489","citation_count":27,"is_preprint":false},{"pmid":"30337811","id":"PMC_30337811","title":"Highly regioselective biotransformation of ginsenoside Rb2 into compound Y and compound K by β-glycosidase purified from Armillaria mellea mycelia.","date":"2017","source":"Journal of ginseng research","url":"https://pubmed.ncbi.nlm.nih.gov/30337811","citation_count":27,"is_preprint":false},{"pmid":"35814238","id":"PMC_35814238","title":"Immunomodulatory Effect of Ginsenoside Rb2 Against Cyclophosphamide-Induced Immunosuppression in Mice.","date":"2022","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/35814238","citation_count":26,"is_preprint":false},{"pmid":"16936745","id":"PMC_16936745","title":"Regulation of cellular senescence by 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cancer.","date":"2011","source":"Molecular cancer research : MCR","url":"https://pubmed.ncbi.nlm.nih.gov/21325284","citation_count":24,"is_preprint":false},{"pmid":"15459751","id":"PMC_15459751","title":"RB and RB2/p130 genes demonstrate both specific and overlapping functions during the early steps of in vitro neural differentiation of marrow stromal stem cells.","date":"2005","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/15459751","citation_count":24,"is_preprint":false},{"pmid":"23670791","id":"PMC_23670791","title":"Isolation and characterization of novel ginsenoside-hydrolyzing glycosidase from Microbacterium esteraromaticum that transforms ginsenoside Rb2 to rare ginsenoside 20(S)-Rg3.","date":"2013","source":"Antonie van Leeuwenhoek","url":"https://pubmed.ncbi.nlm.nih.gov/23670791","citation_count":23,"is_preprint":false},{"pmid":"24833816","id":"PMC_24833816","title":"Korean red ginseng saponin fraction rich in ginsenoside-Rb1, Rc and Rb2 attenuates the severity of mouse collagen-induced arthritis.","date":"2014","source":"Mediators of inflammation","url":"https://pubmed.ncbi.nlm.nih.gov/24833816","citation_count":23,"is_preprint":false},{"pmid":"29762838","id":"PMC_29762838","title":"MiRNA-93 functions as an oncogene in glioma by directly targeting RBL2.","date":"2018","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/29762838","citation_count":22,"is_preprint":false},{"pmid":"21465484","id":"PMC_21465484","title":"The switch from pRb/p105 to Rb2/p130 in DNA damage and cellular senescence.","date":"2012","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/21465484","citation_count":22,"is_preprint":false},{"pmid":"26437949","id":"PMC_26437949","title":"Melanin Biosynthesis Inhibition Effects of Ginsenoside Rb2 Isolated from Panax ginseng Berry.","date":"2015","source":"Journal of microbiology and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/26437949","citation_count":22,"is_preprint":false},{"pmid":"35046806","id":"PMC_35046806","title":"Ginsenoside Rb2 Alleviated Atherosclerosis by Inhibiting M1 Macrophages Polarization Induced by MicroRNA-216a.","date":"2022","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/35046806","citation_count":21,"is_preprint":false},{"pmid":"24281253","id":"PMC_24281253","title":"Silencing of RB1 and RB2/P130 during adipogenesis of bone marrow stromal cells results in dysregulated differentiation.","date":"2013","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/24281253","citation_count":21,"is_preprint":false},{"pmid":"28605877","id":"PMC_28605877","title":"Ginsenoside Rb2 inhibits osteoclast differentiation through nuclear factor-kappaB and signal transducer and activator of transcription protein 3 signaling pathway.","date":"2017","source":"Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie","url":"https://pubmed.ncbi.nlm.nih.gov/28605877","citation_count":21,"is_preprint":false},{"pmid":"16206244","id":"PMC_16206244","title":"Interaction of PP2A catalytic subunit with Rb2/p130 is required for all-trans retinoic acid suppression of ovarian carcinoma cell growth.","date":"2006","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/16206244","citation_count":21,"is_preprint":false},{"pmid":"38678032","id":"PMC_38678032","title":"The pRb/RBL2-E2F1/4-GCN5 axis regulates cancer stem cell formation and G0 phase entry/exit by paracrine mechanisms.","date":"2024","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/38678032","citation_count":20,"is_preprint":false},{"pmid":"34851822","id":"PMC_34851822","title":"Cyclin F drives proliferation through SCF-dependent degradation of the retinoblastoma-like tumor suppressor p130/RBL2.","date":"2021","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/34851822","citation_count":19,"is_preprint":false},{"pmid":"15174090","id":"PMC_15174090","title":"Role of RB and RB2/P130 genes in marrow stromal stem cells plasticity.","date":"2004","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/15174090","citation_count":19,"is_preprint":false},{"pmid":"10741694","id":"PMC_10741694","title":"The RB2/p130 gene: the latest weapon in the war against lung cancer?","date":"2000","source":"Clinical cancer research : an official journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/10741694","citation_count":19,"is_preprint":false},{"pmid":"36926607","id":"PMC_36926607","title":"Ginsenoside Rb2 suppresses cellular senescence of human dermal fibroblasts by inducing autophagy.","date":"2022","source":"Journal of ginseng research","url":"https://pubmed.ncbi.nlm.nih.gov/36926607","citation_count":17,"is_preprint":false},{"pmid":"9538269","id":"PMC_9538269","title":"Molecular cloning, expression, and enzymatic characterization of rabbit hydroxysteroid sulfotransferase AST-RB2.","date":"1998","source":"Journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9538269","citation_count":17,"is_preprint":false},{"pmid":"25183046","id":"PMC_25183046","title":"TGF-beta induced RBL2 expression in renal cancer cells by down-regulating miR-93.","date":"2014","source":"Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico","url":"https://pubmed.ncbi.nlm.nih.gov/25183046","citation_count":16,"is_preprint":false},{"pmid":"38112457","id":"PMC_38112457","title":"Ginsenoside Rb2 improves heart failure by down-regulating miR-216a-5p to promote autophagy and inhibit apoptosis and oxidative stress.","date":"2023","source":"Journal of applied biomedicine","url":"https://pubmed.ncbi.nlm.nih.gov/38112457","citation_count":16,"is_preprint":false},{"pmid":"37649229","id":"PMC_37649229","title":"Efficient Suppression of Dendrites and Side Reactions by Strong Electrostatic Shielding Effect via the Additive of Rb2 SO4 for Anodes in Aqueous Zinc-Ion Batteries.","date":"2023","source":"Small (Weinheim an der Bergstrasse, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/37649229","citation_count":16,"is_preprint":false},{"pmid":"35058503","id":"PMC_35058503","title":"RBL2/DREAM-mediated repression of the Aurora kinase A/B pathway determines therapy responsiveness and outcome in p53 WT NSCLC.","date":"2022","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/35058503","citation_count":15,"is_preprint":false},{"pmid":"11420667","id":"PMC_11420667","title":"The retinoblastoma-related Rb2/p130 gene is an effector downstream of AP-2 during neural differentiation.","date":"2001","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/11420667","citation_count":15,"is_preprint":false},{"pmid":"19252413","id":"PMC_19252413","title":"High incidence of allelic loss at 16q12.2 region spanning RBL2/p130 gene in retinoblastoma.","date":"2009","source":"Cancer biology & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/19252413","citation_count":15,"is_preprint":false},{"pmid":"26043782","id":"PMC_26043782","title":"Ginsenoside Rb2 Attenuates UV-B Radiation-Induced Reactive Oxygen Species and Matrix Metalloproteinase-2 through Upregulation of Antioxidant Components in Human Dermal Fibroblasts.","date":"2015","source":"Pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/26043782","citation_count":15,"is_preprint":false},{"pmid":"16835319","id":"PMC_16835319","title":"Cell cycle regulators p105, p107, Rb2/p130, E2F4, p21CIP1/WAF1, cyclin A in predicting cervical intraepithelial neoplasia, high-risk human papillomavirus infections and their outcome in women screened in three new independent states of the former Soviet Union.","date":"2006","source":"Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/16835319","citation_count":15,"is_preprint":false},{"pmid":"16044156","id":"PMC_16044156","title":"Tumor-specific exon 1 mutations could be the 'hit event' predisposing Rb2/p130 gene to epigenetic silencing in lung cancer.","date":"2005","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/16044156","citation_count":15,"is_preprint":false},{"pmid":"7660823","id":"PMC_7660823","title":"[Calcium channel blockade and anti-free-radical actions of panaxadiol saponins Rb1, Rb2, Rb3, Rc, and Rd].","date":"1995","source":"Zhongguo yao li xue bao = Acta pharmacologica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/7660823","citation_count":15,"is_preprint":false},{"pmid":"33643049","id":"PMC_33643049","title":"Combination of Ginsenosides Rb2 and Rg3 Promotes Angiogenic Phenotype of Human Endothelial Cells via PI3K/Akt and MAPK/ERK Pathways.","date":"2021","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/33643049","citation_count":14,"is_preprint":false},{"pmid":"34980781","id":"PMC_34980781","title":"Effect of Ginsenoside Rb2 on a Myocardial Cell Model of Coronary Heart Disease through Nrf2/HO-1 Signaling Pathway.","date":"2022","source":"Biological & pharmaceutical 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DREAM binds to more than 800 human promoters in G0 and is required for repression of E2F target genes. In S phase, MuvB proteins dissociate from p130 and associate with MYB instead.\",\n      \"method\": \"Proteomics (mass spectrometry), ChIP-chip genomics, bioinformatics, co-immunoprecipitation\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — integrated proteomics, genomics, and functional assays in one rigorous study; evolutionarily conserved complex validated across multiple methods\",\n      \"pmids\": [\"17531812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"RBL2/p130 is a nuclear phosphoprotein; its phosphorylation is cell cycle regulated, reaching a peak at the onset of S-phase. It is one of the major targets of E1A viral oncoprotein-associated kinase activity, similar to p107.\",\n      \"method\": \"Immunocytochemistry, phosphatase treatment, biochemical characterization with polyclonal antibody against the spacer region\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical characterization with multiple methods (immunocytochemistry, phosphatase treatment, cell cycle analysis) in a single lab\",\n      \"pmids\": [\"8567757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RBL2/p130 shuttles between nucleus and cytoplasm. Two independent nuclear localization signals (NLS) were identified in the C-terminus of p130, and an additional NLS was mapped within the unique Loop region. An N-terminal domain confers cytoplasmic localization. The intact pocket domain is sufficient for nuclear translocation. Removal of the entire N-terminus did not affect the ability of p130 to interact with E2F or to induce growth arrest.\",\n      \"method\": \"Heterokaryon fusion assay, transient transfection, microinjection, NLS mutagenesis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal methods (heterokaryon assay, microinjection, mutagenesis) in a single rigorous study\",\n      \"pmids\": [\"11756542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Glycogen synthase kinase 3 (GSK3) phosphorylates RBL2/p130 during G0 quiescence at consensus GSK3 sites. GSK3 phosphorylation of p130 contributes to its stability but does not affect its ability to interact with E2F4 or cyclins.\",\n      \"method\": \"GSK3 small-molecule inhibitors, site-specific p130 mutants, phospho-specific antibodies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis and phospho-specific antibodies, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"15456871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Protein phosphatase 2A (PP2A) associates with RBL2/p130 and dephosphorylates it, protecting p130 from ubiquitination and proteasomal degradation. This association is mediated by the NLS sequences in the C-terminus of Rb2/p130. CDK4 phosphorylation sites on p130 are among the candidate sites dephosphorylated by PP2A. ATRA-mediated growth suppression of ovarian carcinoma cells requires this PP2A–Rb2/p130 interaction.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, siRNA knockdown of PP2A, Rb2/p130 mutant panel, ubiquitination assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — reciprocal Co-IP, GST pulldown, mutagenesis, and siRNA with functional readout, multiple orthogonal methods in one study\",\n      \"pmids\": [\"12915404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PP2A catalytic subunit (PP2Ac) binds directly to the NLS sequences in the C-terminus of Rb2/p130. ATRA treatment leads to hypophosphorylation of PP2Ac (increased PP2A activity), which dephosphorylates the NLS of Rb2/p130, enabling importin alpha binding and nuclear translocation of Rb2/p130, leading to G1 arrest.\",\n      \"method\": \"Co-immunoprecipitation, truncation and NLS mutant transfection, cell growth assays, ATRA treatment\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mutant constructs showing functional consequence, single lab with multiple approaches\",\n      \"pmids\": [\"16206244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Naturally occurring mutations disrupting the putative bipartite nuclear localization signal (NLS) of RBL2/p130 cause aberrant cytoplasmic localization of the protein. Site-directed mutagenesis of NLS residues markedly reduced biological activity (measured by cell cycle analysis), establishing the NLS as essential for p130 tumor suppressor function.\",\n      \"method\": \"SSCP, sequencing, site-directed mutagenesis, transfection, immunocytochemistry, Western blot, flow cytometry\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-directed mutagenesis with functional validation (flow cytometry cell cycle analysis) plus primary tumor data, multiple orthogonal methods\",\n      \"pmids\": [\"10667591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RBL2/p130-mediated inhibition of smooth muscle cell proliferation correlates with its ability to bind and sequester E2F transcription factors. Adenovirus-mediated arterial delivery of RBL2/p130 significantly reduced neointimal hyperplasia in a rat carotid artery restenosis model.\",\n      \"method\": \"Adenoviral gene delivery, rat carotid artery angioplasty model, in vitro proliferation assay, E2F binding assays\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gene delivery with E2F binding as mechanistic correlate, single lab\",\n      \"pmids\": [\"10571534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Overexpression of RBL2/p130 downregulates vascular endothelial growth factor (VEGF) expression both in vitro and in vivo, and inhibits angiogenesis in vivo, using a tetracycline-regulated expression system and retroviral/adenoviral delivery.\",\n      \"method\": \"Tet-regulated gene expression, retroviral and adenoviral gene delivery, VEGF protein measurement, in vivo angiogenesis assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple delivery systems (retroviral, adenoviral, Tet-inducible) converging on same phenotype, single lab\",\n      \"pmids\": [\"11212232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Rb2/p130 is the dominant pocket protein mediating cellular senescence in a p53-p21-dependent manner. Knockdown of Rb2/p130 by RNAi allowed re-entry into S phase (cyclin A expression and DNA synthesis restored) in senescent cells. Overexpression of either p21 or p16 converged on Rb2/p130 accumulation to induce senescence. p53- or p21-negative cells failed to accumulate Rb2/p130 upon DNA damage and did not enter senescence.\",\n      \"method\": \"RNAi knockdown, cell cycle analysis (cyclin expression), overexpression of p21/p16, comparison across multiple cell lines\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi epistasis with direct cell cycle readout, replicated across multiple cell lines and conditions, two upstream pathway branches tested\",\n      \"pmids\": [\"19648966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"p53 cooperates selectively with p130/Rb2 to induce cellular senescence. Activation of temperature-sensitive p53 in p16-negative C6 glioma cells induces a switch in pocket protein expression from pRb/p107 to p130/Rb2, arresting cells in late G1/early S-phase. Maintenance of arrest depends on p130/Rb2 repressing cyclin A.\",\n      \"method\": \"Temperature-sensitive p53 mutant, stable transfection, cell cycle analysis (cyclin expression), immunofluorescence\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional epistasis using ts-p53 with cell cycle molecular readouts, single lab\",\n      \"pmids\": [\"16123778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"A CDE/CHR-like element in the mouse RBL2/p130 gene promoter mediates cell cycle-dependent transcriptional repression. This bipartite element makes major groove DNA contacts with proteins detectable in vivo, and inactivation of either CDE or CHR strongly upregulates p130 promoter activity in proliferating cells where endogenous p130 is nearly undetectable. Two different protein complexes bind independently to the CDE and CHR elements.\",\n      \"method\": \"Promoter deletion analysis, in vivo genomic footprinting, EMSA, luciferase reporter assays, site-directed mutagenesis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo footprinting plus mutagenesis with functional reporter assays, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"10760507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The AP-2 transcription factor directly binds a KER1 palindromic sequence in the Rb2/p130 promoter and activates its transcription. AP-2 overexpression increased Rb2/p130 mRNA and protein; Rb2/p130 acts as a critical effector downstream of AP-2 in sustaining ectodermal/neuronal differentiation in PC12 cells.\",\n      \"method\": \"Promoter analysis, EMSA (in vitro AP-2 binding), transfection/overexpression, AP-2B dominant negative, NGF differentiation model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus functional overexpression/dominant-negative experiments, single lab\",\n      \"pmids\": [\"11420667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"HIV-1 Tat protein physically binds to pRb2/p130 in vitro and in vivo binding assays, potentially inactivating its oncosuppressive properties and inducing expression of cell cycle genes including p107, cyclin A, and cyclin B.\",\n      \"method\": \"In vitro and in vivo binding assays (co-immunoprecipitation)\",\n      \"journal\": \"Human pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct binding assay with functional correlation (cell cycle gene expression changes), single lab\",\n      \"pmids\": [\"12196924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"nm23 modulates the expression of Rb2/p130 gene during NGF-induced PC12 cell differentiation. nm23-H1 mutants defective in inhibiting invasion downregulate Rb2/p130 expression and inhibit NGF-induced differentiation, establishing an interplay between nm23 and Rb2/p130 in driving neuronal differentiation.\",\n      \"method\": \"Transfection of nm23 mutants, Western blot, neurite outgrowth assay, [3H]thymidine incorporation\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — epistasis via mutant overexpression with differentiation readout, single lab\",\n      \"pmids\": [\"11423907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RBL2 interacts with the transcription factor E2F4 and binds to promoter regions of E2F target genes to repress them. Disruption of the RBL2/E2F4 complex by miR-17-5p overexpression shifts E2F activity from gene repression to activation, inducing cell cycle entry and proliferation in pancreatic cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, luciferase reporter assay, flow cytometry, miRNA overexpression/knockdown\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP demonstrating direct promoter binding, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"28987387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RBL2/p130 is a direct substrate of AKT kinase. AKT1 physically interacts with RBL2/p130 and phosphorylates it at Ser941 in the pocket domain; mutation of Ser941 to Ala abolishes AKT-mediated phosphorylation. Pharmacological AKT inhibition impairs RBL2 Ser941 phosphorylation, increases RBL2 stability and nuclear levels, and induces RBL2-dependent apoptosis in lung cancer and mesothelioma cells.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis (S941A), AKT inhibitor treatment, RBL2 silencing rescue experiments, flow cytometry\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis plus functional RBL2 silencing/rescue, multiple cell lines, single lab with orthogonal methods\",\n      \"pmids\": [\"29606701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RBL2/p130 is a direct substrate of the SCF-cyclin F E3 ubiquitin ligase complex. Cyclin F binds a regulatory site in the flexible linker of the p130 pocket domain, and this site mediates binding, ubiquitination, and stability of p130. Expression of a ubiquitination-resistant p130 mutant severely impairs cell proliferation and cell cycle gene expression.\",\n      \"method\": \"CRISPR/Cas9 genetic screens, direct binding assay, ubiquitination assay, mutagenesis, quantitative iterative immunofluorescent imaging, transcript analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct ubiquitination reconstitution, site mapping by mutagenesis, and functional cell cycle readout, multiple orthogonal methods in one study\",\n      \"pmids\": [\"34851822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Utx histone H3K27 demethylase directly regulates RBL2/p130 expression. Utx associates with the Rbl2 promoter, removes repressive H3K27 trimethylation, and increases active H3K4 trimethylation. Endogenous Utx is recruited to the Rbl2 promoter as shown by ChIP after siRNA knockdown.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), siRNA knockdown, ectopic expression, histone methylation analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP showing promoter occupancy and histone marks, validated by endogenous Utx knockdown, single lab\",\n      \"pmids\": [\"20650264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CTCF directly controls RBL2/p130 gene expression in lung fibroblasts by binding the Rb2/p130 promoter and establishing a local chromatin organization that governs transcriptional activity. In lung cancer cells, BORIS (a CTCF paralogue) competes with CTCF at the Rb2/p130 promoter, altering the chromatin state and impairing CTCF-mediated activation of Rb2/p130.\",\n      \"method\": \"ChIP, promoter binding assays, chromatin organization analysis, BORIS/CTCF overexpression, lung cancer cell proliferation assays\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct promoter binding, functional competition assay, single lab\",\n      \"pmids\": [\"21325284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Loss of Rbl2/p130 in adult mice results in unscheduled proliferation of cochlear supporting cells and supernumerary inner ear hair cells and supporting cells in apical regions, with downregulation of cell cycle inhibitors, establishing p130 as a regulator of mitotic quiescence in cochlear supporting and hair cells.\",\n      \"method\": \"p130 knockout mouse analysis, cochlear histology, BrdU incorporation, cell cycle inhibitor expression analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse with defined cellular phenotype and molecular mechanism (cell cycle inhibitor downregulation), single lab\",\n      \"pmids\": [\"21677172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"p130/Rb2 and Mirk/dyrk1B cooperatively mediate G0 quiescent arrest in ovarian cancer cells. Depletion of p130/Rb2 reduced the G0 fraction, increased cisplatin sensitivity, and reduced Mirk levels. p130/Rb2 forms complexes with E2F4 in G0-arrested cells.\",\n      \"method\": \"siRNA depletion, flow cytometry (G0 fraction), co-immunoprecipitation (p130/E2F4 complex), cell viability assays\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with functional G0/cell cycle and apoptosis readouts plus Co-IP, single lab\",\n      \"pmids\": [\"20857490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RBL2/p130 represses FGFR1 expression; loss of RBL2 induces FGFR1 expression, and restoration of RBL2 represses it. In a mouse SCLC model, Fgfr1 knockout suppressed tumor development when Rbl2 was lost but not when Rbl2 was wild-type, placing RBL2 upstream of FGFR1 in a regulatory pathway.\",\n      \"method\": \"Fgfr1 knockout mouse crossed with Rbl2-deficient SCLC model, RBL2 restoration in cancer cell lines, gene expression analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in mouse model plus cell line restoration experiments, single lab\",\n      \"pmids\": [\"32973083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RBL2/p130 is a component of the DREAM repressor complex that represses Aurora kinase A/B pathway genes in a p53-dependent manner. Knockdown of p53, RBL2, or the DREAM component LIN37 increased AURKA/B pathway gene expression and reduced paclitaxel and radiation sensitivity in NSCLC cells.\",\n      \"method\": \"siRNA knockdown of RBL2, LIN37, p53; gene expression analysis; drug/radiation sensitivity assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi epistasis with expression and functional drug response readouts, single lab\",\n      \"pmids\": [\"35058503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Downregulation of PARP1 in monocytes during differentiation-associated cell cycle exit involves assembly of an E2F4-RBL2-HDAC1-BRM(SWI/SNF) repressor complex at the PARP1 promoter that deacetylates nucleosomes and compacts chromatin. Silencing of RBL2 restored PARP1 expression and increased transcription of pluripotency factors (POU5F1, SOX2, NANOG) in monocytes.\",\n      \"method\": \"ChIP, RNAi knockdown, HDAC/EZH2 inhibitor treatment, reporter assays, chromatin compaction analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating promoter occupancy of E2F4-RBL2 complex plus RNAi functional validation, single lab\",\n      \"pmids\": [\"28842672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The E2F1/4-pRb/RBL2 axis regulates WNT ligand expression (WNT7A, WNT7B, WNT10A, WNT4) in a cell-autonomous manner: E2F1 and E2F4 induce WNT expression while pRb/RBL2 represses it, thereby regulating cancer stem cell self-renewal, chemoresistance, and invasiveness through paracrine WNT signaling. The histone acetyltransferase GCN5 deposits H3K9ac on WNT promoters downstream of E2F.\",\n      \"method\": \"Quantitative proteomics of secreted proteins (CSC secretome), genetic manipulation of E2F/RB pathway, WNT expression analysis, epigenetic inhibitor screening, PDAC and breast cancer models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative proteomics plus genetic manipulation with defined WNT expression readout, single lab but multiple cancer models\",\n      \"pmids\": [\"38678032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In Dicer1-deficient mouse cells, Rbl2 protein accumulates and is responsible for decreased expression of Dnmt1, Dnmt3a, and Dnmt3b DNA methyltransferases, leading to global DNA hypomethylation and increased telomere recombination. The miR-290 cluster (downregulated in Dicer1-null cells) normally silences Rbl2 to maintain Dnmt expression.\",\n      \"method\": \"Dicer1 knockout cells, Dnmt overexpression rescue, methylation analysis, miR-290 re-expression, luciferase 3'UTR reporter assays\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis in knockout cells with rescue experiments (Dnmt overexpression, miR-290 re-expression), multiple orthogonal methods, reproduced across conditions\",\n      \"pmids\": [\"18311151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HOXB9 transcriptionally upregulates RBL2 expression in pancreatic cancer cells. Upregulated RBL2 blocks cell cycle progression in G0/G1 and inhibits c-Myc. DNMT1 epigenetically silences HOXB9 by methylating its promoter, thus forming a DNMT1/HOXB9/RBL2/c-Myc axis regulating pancreatic cancer cell proliferation.\",\n      \"method\": \"Cell cycle PCR array, flow cytometry, ChIP-qPCR, luciferase reporter assay, xenograft and PDX mouse models, methylation analysis\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP showing direct promoter regulation, cell cycle and in vivo functional readouts, single lab with multiple methods\",\n      \"pmids\": [\"35182659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TGF-β induces RBL2 expression in renal cancer cells by downregulating miR-93, which directly targets the RBL2 3'UTR. RBL2 mediates TGF-β-induced G1 growth arrest and cell cycle inhibition in these cells.\",\n      \"method\": \"qRT-PCR, Western blot, CCK-8 proliferation assay, PI staining (cell cycle), dual luciferase 3'UTR reporter assay, miR-93 overexpression/knockdown\",\n      \"journal\": \"Clinical & translational oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase 3'UTR validation plus functional epistasis (miR-93→RBL2→growth arrest), single lab\",\n      \"pmids\": [\"25183046\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RBL2/p130 is a nuclear phosphoprotein that functions as a cell cycle repressor and tumor suppressor by forming the DREAM multisubunit complex (with E2F4 and MuvB subunits LIN-9/37/52/54/RBBP4) to silence hundreds of cell cycle-dependent genes in quiescence; its activity is regulated post-translationally by CDK-mediated phosphorylation (promoting inactivation), GSK3-mediated phosphorylation (stabilizing the protein), AKT-mediated phosphorylation at Ser941 (destabilizing the pocket domain), PP2A-mediated dephosphorylation at NLS sites (stabilizing p130 and enabling nuclear import), and SCF-cyclin F-mediated ubiquitination and degradation; it shuttles between nucleus and cytoplasm via defined NLS and cytoplasmic retention signals, represses VEGF and FGFR1 expression, cooperates with p53 to enforce senescence, and its expression is transcriptionally regulated by CTCF, AP-2, Utx H3K27 demethylase, and miRNA-mediated pathways (including miR-290 and miR-17 family).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RBL2/p130 is a nuclear pocket-protein cell-cycle repressor that enforces quiescence and senescence by assembling the DREAM repressor complex with E2F4 and the MuvB subunits LIN-9/37/52/54 and RBBP4, which binds over 800 promoters in G0 to silence E2F target genes; in S phase the MuvB module dissociates from p130 and switches to MYB [#0]. Its repressive output extends to specific gene programs including Aurora kinase A/B pathway genes via the DREAM/LIN37 module [#23], the PARP1 promoter through an E2F4-RBL2-HDAC1-BRM(SWI/SNF) complex that compacts chromatin [#24], and paracrine WNT ligands within an E2F/RB axis [#25], while it also represses VEGF [#8], FGFR1 [#22], and the Dnmt methyltransferases [#26]. p130 functions as the dominant pocket protein driving p53-p21-dependent senescence, accumulating downstream of p21 or p16 to repress cyclin A and block S-phase re-entry [#9, #10]. Its activity is set by a dense post-translational network: cell-cycle-regulated phosphorylation peaks at S-phase onset [#1], GSK3 phosphorylation stabilizes the protein [#3], AKT1 phosphorylates Ser941 in the pocket domain to destabilize it and limit nuclear accumulation [#16], PP2A dephosphorylates C-terminal NLS sites to protect p130 from ubiquitination and enable importin-alpha-mediated nuclear import [#4, #5], and the SCF-cyclin F E3 ligase binds a site in the pocket-domain linker to ubiquitinate and degrade it [#17]. Nucleocytoplasmic shuttling is governed by multiple C-terminal and Loop-region NLSs and an N-terminal cytoplasmic-retention domain, and natural NLS-disrupting mutations that mislocalize p130 to the cytoplasm abolish its tumor-suppressor cell-cycle-arrest activity [#2, #6]. RBL2 transcription is itself controlled by CTCF (antagonized by BORIS), AP-2, Utx-mediated H3K27 demethylation, HOXB9, and miRNA targeting of its 3'UTR (miR-290, miR-17, miR-93) [#19, #12, #18, #27, #26, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that p130 is a nuclear phosphoprotein whose phosphorylation is cell-cycle-coupled and targeted by viral oncoprotein-associated kinases, framing it as a regulated cell-cycle component rather than a static protein.\",\n      \"evidence\": \"Immunocytochemistry, phosphatase treatment, and biochemical cell-cycle analysis with a spacer-region antibody\",\n      \"pmids\": [\"8567757\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific kinases and phosphosites not yet defined\", \"Functional consequence of phosphorylation peak not established\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showed that an intact NLS is essential for p130 nuclear localization and tumor-suppressor function, linking subcellular localization directly to cell-cycle-arrest activity.\",\n      \"evidence\": \"SSCP/sequencing of tumors, NLS site-directed mutagenesis, immunocytochemistry, and flow cytometry\",\n      \"pmids\": [\"10667591\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Import machinery not identified at this stage\", \"Did not address upstream regulation of NLS\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified a CDE/CHR promoter element that imposes cell-cycle-dependent repression of the RBL2 gene itself, revealing autoregulatory transcriptional control of p130 levels.\",\n      \"evidence\": \"In vivo genomic footprinting, EMSA, and luciferase reporters with mutagenesis (mouse promoter)\",\n      \"pmids\": [\"10760507\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of CDE/CHR-binding complexes not determined\", \"Element studied in mouse promoter only\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapped the determinants of p130 nucleocytoplasmic shuttling, defining multiple NLSs, a cytoplasmic-retention N-terminus, and the pocket domain as sufficient for nuclear import and E2F-dependent growth arrest.\",\n      \"evidence\": \"Heterokaryon fusion, microinjection, and NLS mutagenesis in transfected cells\",\n      \"pmids\": [\"11756542\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals controlling shuttling dynamics not linked to upstream pathways here\", \"Import receptor not yet identified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined PP2A as a stabilizing regulator that binds and dephosphorylates p130 at its C-terminal NLS, protecting it from ubiquitin-proteasomal degradation and linking dephosphorylation to growth suppression.\",\n      \"evidence\": \"Reciprocal Co-IP, GST pulldown, PP2A siRNA, mutant panel, and ubiquitination assays with ATRA growth readout\",\n      \"pmids\": [\"12915404\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific dephosphorylated residues only partially mapped\", \"Connection to import machinery not yet shown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated that GSK3 phosphorylation of p130 during G0 promotes its stability without altering E2F4 or cyclin binding, distinguishing stabilizing from inactivating phosphorylation events.\",\n      \"evidence\": \"GSK3 inhibitors, site-specific mutants, and phospho-specific antibodies in quiescent cells\",\n      \"pmids\": [\"15456871\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which phosphorylation confers stability not resolved\", \"Interplay with PP2A and CDK sites not integrated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Connected PP2A-mediated NLS dephosphorylation to importin-alpha binding, providing a mechanistic route from phosphatase activity to nuclear translocation and G1 arrest.\",\n      \"evidence\": \"Co-IP, truncation/NLS mutants, and growth assays under ATRA in ovarian carcinoma cells\",\n      \"pmids\": [\"16206244\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct importin-alpha-p130 interaction shown in one system\", \"Kinase counteracting PP2A at NLS not identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed that p53 selectively cooperates with p130 to drive senescence via a pocket-protein switch and cyclin A repression, identifying p130 as the effector arm of p53-induced arrest.\",\n      \"evidence\": \"Temperature-sensitive p53, stable transfection, and cyclin-based cell-cycle analysis in p16-null glioma cells\",\n      \"pmids\": [\"16123778\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality beyond p16-null glioma context untested here\", \"How p53 triggers the pocket-protein switch not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established p130 as the dominant pocket protein for p53-p21-dependent senescence, with p16 and p21 converging on p130 accumulation and its knockdown permitting S-phase re-entry.\",\n      \"evidence\": \"RNAi epistasis, p21/p16 overexpression, and cyclin/DNA-synthesis readouts across multiple cell lines\",\n      \"pmids\": [\"19648966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of p130 accumulation downstream of p21 not fully defined\", \"Did not resolve DREAM-level mechanism\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the DREAM complex architecture, showing p130 partners with E2F4 and MuvB subunits to repress >800 promoters in G0 and that S-phase entry triggers MuvB dissociation and a switch to MYB.\",\n      \"evidence\": \"Mass spectrometry, ChIP-chip, bioinformatics, and Co-IP\",\n      \"pmids\": [\"17531812\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal triggering MuvB-p130 dissociation not mechanistically resolved\", \"Promoter-selectivity determinants within the >800 targets unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed a developmental/epigenetic role: miR-290-mediated silencing of Rbl2 sustains Dnmt expression, so Rbl2 accumulation in Dicer1-null cells causes DNA hypomethylation and telomere recombination.\",\n      \"evidence\": \"Dicer1-knockout cells, Dnmt rescue, miR-290 re-expression, and 3'UTR luciferase reporters\",\n      \"pmids\": [\"18311151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Rbl2 represses Dnmt genes not detailed\", \"Relationship to DREAM repression not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed that disrupting the RBL2-E2F4 promoter complex (via miR-17-5p) flips E2F activity from repression to activation, demonstrating that the complex's integrity gates proliferation.\",\n      \"evidence\": \"Co-IP, ChIP, luciferase reporters, and miRNA gain/loss with flow cytometry in pancreatic cancer cells\",\n      \"pmids\": [\"28987387\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cancer-cell context\", \"Did not dissect full DREAM/MuvB involvement\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified AKT1 as a kinase that directly phosphorylates p130 at Ser941 in the pocket domain to destabilize it and limit nuclear levels, defining a survival-signaling input that restrains p130-dependent apoptosis.\",\n      \"evidence\": \"Co-IP, in vitro kinase assay, S941A mutagenesis, AKT inhibition, and RBL2-silencing rescue across cancer lines\",\n      \"pmids\": [\"29606701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Link between Ser941 phosphorylation and degradation machinery not defined\", \"Interplay with PP2A/cyclin F not integrated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined the SCF-cyclin F E3 ligase as the degradation pathway for p130, mapping a cyclin F-binding site in the pocket-domain linker whose mutation impairs proliferation and cell-cycle gene expression.\",\n      \"evidence\": \"CRISPR screens, direct binding and ubiquitination assays, mutagenesis, and quantitative imaging\",\n      \"pmids\": [\"34851822\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coordination with AKT/PP2A phospho-regulation not resolved\", \"Cell-cycle timing of degradation only partially mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended DREAM target scope to therapy-relevant programs, showing p53/RBL2/LIN37-dependent repression of Aurora kinase A/B genes controls paclitaxel and radiation sensitivity.\",\n      \"evidence\": \"siRNA knockdown of RBL2/LIN37/p53 with expression and drug/radiation-response assays in NSCLC\",\n      \"pmids\": [\"35058503\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DREAM occupancy of AURKA/B promoters not shown here\", \"Single-lab cell-line data\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placed RBL2 upstream of FGFR1 in vivo, showing RBL2 loss induces FGFR1 and that Fgfr1 deletion suppresses tumorigenesis specifically when Rbl2 is lost, defining a tumor-suppressor effector pathway.\",\n      \"evidence\": \"Fgfr1-knockout cross with Rbl2-deficient SCLC mouse model plus cell-line restoration\",\n      \"pmids\": [\"32973083\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether FGFR1 repression is direct DREAM-mediated not shown\", \"Mechanism of derepression upon RBL2 loss unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed the E2F1/4-pRb/RBL2 axis controls paracrine WNT ligand expression via GCN5-deposited H3K9ac, linking p130 repression to cancer stem-cell self-renewal and chemoresistance.\",\n      \"evidence\": \"Secretome proteomics, genetic E2F/RB manipulation, WNT expression, and epigenetic inhibitor screens in PDAC/breast models\",\n      \"pmids\": [\"38678032\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct RBL2 occupancy at WNT promoters not detailed\", \"Relative contributions of pRb vs RBL2 not separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple, opposing post-translational inputs (CDK/AKT phosphorylation, GSK3-mediated stabilization, PP2A dephosphorylation, SCF-cyclin F degradation) are integrated to set p130 abundance, localization, and DREAM occupancy at specific promoters across the cell cycle remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coordinating phospho-regulation with ubiquitination timing\", \"Determinants of DREAM promoter selectivity unknown\", \"No structural model of the p130 pocket-domain regulatory linker bound by its regulators\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 15, 23, 24, 25]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 7, 9]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 15, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 6]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 9, 17, 21]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 15, 24, 25]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [9, 10]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 16, 17]}\n    ],\n    \"complexes\": [\n      \"DREAM complex\",\n      \"E2F4-RBL2-HDAC1-BRM(SWI/SNF) repressor complex\"\n    ],\n    \"partners\": [\n      \"E2F4\",\n      \"LIN9\",\n      \"LIN37\",\n      \"LIN52\",\n      \"LIN54\",\n      \"RBBP4\",\n      \"PP2A\",\n      \"CCNF\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}