{"gene":"RBPJ","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1994,"finding":"RBPJ (RBP-Jκ/KBF2) binds the core DNA sequence CGTGGGAA, as determined by electrophoretic mobility shift assay with mutant probes and systematic selection from random oligonucleotide pools; the protein recognizes the GTGGGAA heptanucleotide and makes weaker contacts with flanking ACT and CG sequences.","method":"Electrophoretic mobility shift assay (EMSA) with systematic mutant probes; oligonucleotide selection/enrichment from random sequences","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro DNA-binding assays with systematic mutagenesis plus selection from random sequences, establishing precise recognition motif","pmids":["8152928"],"is_preprint":false},{"year":1996,"finding":"The intracellular domain of mammalian Notch1 (NotchIC) physically interacts with the transcriptional repressor CBF1/RBPJ; the N-terminal 114 amino acids of NotchIC contain the CBF1-binding domain, whereas the ankyrin repeats are dispensable for this interaction. NotchIC is targeted to the transcriptional repression domain (aa 179–361) of CBF1 and transactivates gene expression by abolishing CBF1-mediated repression, the same mechanism used by EBV EBNA2.","method":"In vitro binding assay; two-hybrid cotransfection assay; co-immunoprecipitation with truncation mutants; transcriptional reporter assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (pulldown, co-IP, reporter assays, mutant mapping) in a single rigorous study; independently replicated by multiple labs","pmids":["8622698"],"is_preprint":false},{"year":1996,"finding":"Constitutively active human Notch1 (N1ΔEC) physically binds CBF1/RBPJ by co-immunoprecipitation in COS-1 cells and activates transcription through a CBF1-responsive element, demonstrating functional coupling of Notch1 and CBF1 in human cells.","method":"Co-immunoprecipitation; transcriptional reporter assay (CAT) in multiple cell lines","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus functional reporter assay, confirmed across multiple cell lines","pmids":["8643633"],"is_preprint":false},{"year":1997,"finding":"Notch1 intracellular region (RAMIC) contains two separable functional domains: RAM (sufficient for RBP-J binding) and IC (transactivation domain with weaker RBP-J interaction). Transactivation by IC requires RBP-J, demonstrated using an RBP-J null cell line. The RAM domain synergistically stimulates IC transactivation, proposed to compete with a putative co-repressor for RBP-J binding. Suppression of myogenic differentiation by Notch1 correlates with RBP-J–dependent transactivation.","method":"Deletion mutant analysis; transactivation assay in RBP-J null cell line; myogenic differentiation assay with RBP-J-VP16 fusion","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic null cell line epistasis plus domain-deletion biochemistry in one study; consistent with multiple other labs","pmids":["9374409"],"is_preprint":false},{"year":1999,"finding":"CBF1/RBPJ mediates transcriptional repression by binding a unique corepressor CIR, which in turn binds histone deacetylase and SAP30, linking CBF1 to the histone deacetylase complex. Two CBF1 mutants unable to bind CIR lose repressor function, establishing CIR recruitment as essential for CBF1-mediated repression.","method":"Protein-protein interaction assays; co-immunoprecipitation; reporter repression assays; CBF1 mutants defective in CIR binding","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — loss-of-function mutants with defined binding defect show loss of repression; multiple biochemical methods in one study","pmids":["9874765"],"is_preprint":false},{"year":1999,"finding":"Delta1-induced Notch signaling activates transcription of RBP-J–binding motif-containing promoters including HES1, and this activation is primary (cycloheximide-insensitive). HES1 induction subsequently represses MyoD mRNA, blocking myogenic differentiation. A constitutively active VP16-RBP-J fusion recapitulates Notch-mediated inhibition of myogenesis.","method":"Co-culture with Delta1-expressing cells; cycloheximide treatment; mRNA expression analysis; VP16-RBP-J transfection in C2C12 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — ligand-induced signaling system with cycloheximide controls plus constitutively active RBP-J gain-of-function; mechanism confirmed by multiple approaches","pmids":["10066785"],"is_preprint":false},{"year":1998,"finding":"RBP-J represses transcription by directly interacting with two transcriptional coactivators, dTAFII110 (a TFIID subunit) and TFIIA, perturbing their optimal interactions. RBP-J does not occlude other transcription factor binding to promoters. The RBP-J interaction domain on dTAFII110 overlaps with the TFIIA-interaction domain but is distinct from the Sp1-interaction domain.","method":"In vitro transcription assay; protein-protein interaction assays; pre-formed transcription preinitiation complex competition experiments","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro transcription system with defined protein interactions and competition assays; single lab but multiple orthogonal methods","pmids":["9620850"],"is_preprint":false},{"year":1994,"finding":"The Drosophila Hairless protein directly inhibits DNA binding of both Su(H) and its human homolog KBF2/RBP-Jκ through protein-protein interactions in vitro. This inhibitory interaction is consistent with Su(H)-driven transcriptional activation being suppressed by Hairless in Drosophila S2 cells, placing Hairless as a negative regulator of Su(H)/RBPJ activity.","method":"Protein purification; EMSA; in vitro protein-protein interaction; transcriptional reporter assay in Drosophila S2 cells","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct in vitro binding assay with purified proteins plus functional cellular assay; defines mechanism of Hairless inhibition","pmids":["7958912"],"is_preprint":false},{"year":2000,"finding":"SKIP interacts with the CBF1 corepressor complex components (SMRT, CIR, Sin3A, HDAC2) and also with EBNA2, and is required for efficient EBNA2-mediated activation of CBF1-dependent promoters. EBNA2 competes with the SMRT-corepressor complex for contacts on SKIP and CBF1 to relieve repression.","method":"Yeast two-hybrid screen; GST affinity assays; mammalian two-hybrid assays; immunofluorescence co-localization; transcriptional reporter assays","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays and functional reporter experiments, single lab","pmids":["10644367"],"is_preprint":false},{"year":2001,"finding":"EBV RPMS1 protein interacts with both CBF1/RBPJ and components of the CBF1-associated corepressor complex (Sin3A, CIR), and negatively regulates EBNA2- and NotchIC-mediated transcriptional activation by blocking relief of CBF1-mediated repression and interfering with SKIP-CIR interactions.","method":"GST affinity assays; co-immunoprecipitation; mammalian two-hybrid; immunofluorescence co-localization; reporter assays; muscle differentiation assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple complementary binding and functional assays, single lab","pmids":["11222720"],"is_preprint":false},{"year":2003,"finding":"CBF1/RBPJ binds to the κB site of the IκBα promoter and represses IκBα transcription, thereby elevating basal NF-κB activity. The Notch1 intracellular domain (NICD) relieves this CBF1-mediated repression of IκBα in an RAM-domain-dependent manner, and co-activation with p300 enhances IκBα promoter function.","method":"EMSA; promoter mutagenesis; CBF1 overexpression in COS1 cells; NICD co-transfection; IκBα protein level measurement","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — DNA-binding and functional promoter assays with site mutants and domain mutants, single lab","pmids":["12700242"],"is_preprint":false},{"year":2004,"finding":"The polycomb group protein RING1 is recruited to RBP-J through the LIM protein KyoT2, forming a three-molecule RBP-J–KyoT2–RING1 complex. RING1 and RBP-J do not associate directly. Overexpression of RING1 together with KyoT2 inhibits NIC-mediated transactivation of RBP-J, and this suppression is abrogated by competing KyoT2 away from RING1.","method":"Yeast two-hybrid; GST pulldown; co-immunoprecipitation; reporter transactivation assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP plus functional reporter assays with competition experiments, single lab","pmids":["14999091"],"is_preprint":false},{"year":2005,"finding":"The PcG protein HPC2 interacts with KyoT2 LIM domains and, when overexpressed, inhibits NIC-mediated transactivation of RBP-J-dependent promoters as well as transactivation by constitutively active RBP-J-VP16, establishing HPC2 as an additional co-suppressor recruited to RBP-J via KyoT2.","method":"Yeast two-hybrid; GST pulldown; co-immunoprecipitation; mammalian two-hybrid; reporter assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple binding and functional assays, single lab","pmids":["15710417"],"is_preprint":false},{"year":2011,"finding":"In zebrafish, Wt1a, Foxc1a, and Rbpj physically interact with each other by GST pulldown and co-immunoprecipitation; only Rbpj binds the Notch intracellular domain (NICD). In transactivation assays, combinations of Wt1, FoxC1/2, and NICD synergistically activate the Hey1 promoter, demonstrating that these factors converge on common target genes as a physical complex to regulate podocyte fate.","method":"GST pulldown; co-immunoprecipitation; transactivation reporter assays; morpholino knockdown in zebrafish","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays plus functional reporter data, but single lab and model organism","pmids":["21871448"],"is_preprint":false},{"year":2013,"finding":"ChIP-Seq in myogenic cells demonstrates that RBPJ binding is dynamic: at sites co-occupied by NICD, RBPJ binding increases upon Notch activation, contradicting a static occupancy model. A distinct subset of RBPJ sites shows static binding irrespective of Notch activity and lacks NICD or p300 co-occupancy, indicating RBPJ can occupy chromatin independently of Notch signaling state.","method":"ChIP-Seq for RBPJ, NICD, p300, H3K4me3, H3K4me1, H3K27ac under active vs. inhibitory Notch conditions","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide ChIP-Seq with multiple histone marks and co-factors under two defined signaling states; rigorous single study with multiple orthogonal chromatin readouts","pmids":["23651858"],"is_preprint":false},{"year":2017,"finding":"RBPJ recruits L3MBTL3 (MBT1) and the histone demethylase KDM1A/LSD1 to enhancers of Notch target genes in the absence of NICD, leading to H3K4me2 demethylation and transcriptional repression. L3MBTL3 competes with NICD for binding to RBPJ. This mechanism is evolutionarily conserved in Drosophila and C. elegans.","method":"Proteomic/mass spectrometry identification of RBPJ interactors; co-immunoprecipitation; ChIP; H3K4me2 demethylation assays; in vivo genetic analyses in Drosophila and C. elegans","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — proteomic discovery followed by multiple biochemical validations, ChIP, and in vivo genetics across three organisms","pmids":["29030483"],"is_preprint":false},{"year":2019,"finding":"The crystal structure of RBPJ bound to the corepressor SHARP and DNA was determined, revealing SHARP's mode of binding to RBPJ. Structure-based mutants of RBPJ that are deficient for SHARP binding are incapable of repressing Notch-responsive gene expression in cells, demonstrating that the RBPJ–SHARP interface is essential for RBPJ's repressor function.","method":"X-ray crystallography; biophysical binding assays; structure-based mutagenesis; cellular transcriptional repression assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with structure-based mutagenesis and cellular functional assays in one rigorous study","pmids":["30673607"],"is_preprint":false},{"year":2017,"finding":"The X-ray structure of RBPJ bound to RITA and DNA was determined, showing RITA binds RBPJ similarly to the RAM domain of Notch. Structure-based mutants and ITC measurements mapped binding regions; biochemical/cellular assays showed RITA interacts with additional regions beyond the RAM-like interface. RITA-mediated down-regulation of Notch target genes requires RBP-J/RITA complex formation.","method":"X-ray crystallography; isothermal titration calorimetry; biochemical binding assays; cellular reporter assays; endogenous co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with biophysical validation and cellular functional assays, single lab","pmids":["28487372"],"is_preprint":false},{"year":2018,"finding":"Cyclin F (an SCF E3 ubiquitin ligase substrate-recognition subunit) mediates polyubiquitylation of RBPJ at Lys315 under metabolic stress, leading to proteasomal degradation of RBPJ. This degradation is induced in a FOXO1-dependent manner and attenuates RBPJ-dependent IDH1 expression.","method":"Ubiquitylation assays; site-directed mutagenesis (Lys315); proteasome inhibitor experiments; co-immunoprecipitation; mouse tumor models","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitylation assays with defined lysine site plus in vivo mouse model, single lab","pmids":["30254149"],"is_preprint":false},{"year":2016,"finding":"RBPJ maintains brain tumor-initiating cells (BTICs) by binding CDK9 (a component of P-TEFb) at target gene promoters to enhance transcriptional elongation. MYC binds the RBPJ promoter and drives RBPJ expression in BTICs. This RBPJ function is distinct from canonical Notch signaling.","method":"Proteomics (RBPJ interactome); ChIP; shRNA knockdown; tumor growth assays; BET bromodomain inhibitor treatment","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic identification of CDK9 interaction confirmed by ChIP, but mechanism details rely on single lab","pmids":["27322055"],"is_preprint":false},{"year":2019,"finding":"RBPJ-Inhibitor-1 (RIN1), a small molecule, disrupts the interaction between NOTCH ICD and RBPJ, and also blocks the functional interaction of RBPJ with SHARP, inhibiting both the activating (NOTCH-bound) and repressing (SHARP-bound) complexes of RBPJ. Gene expression changes induced by RIN1 resemble siRNA silencing of RBPJ.","method":"Small-molecule screen; protein-protein interaction assays; gene expression profiling; cell proliferation assays; C2C12 differentiation assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chemical biology with parallel RNAi comparison, but mechanistic details limited by abstract","pmids":["31346210"],"is_preprint":false},{"year":2014,"finding":"Uterine RBPJ interacts physically with estrogen receptor α (ERα) in a Notch pathway-independent manner to regulate uterine lumen shape transformation prior to embryo attachment. At post-implantation stages, RBPJ directly regulates uterine matrix metalloproteinase expression in a Notch pathway-dependent manner for decidual remodeling.","method":"Conditional knockout mice (uterine-specific Rbpj deletion); co-immunoprecipitation (RBPJ–ERα); gene expression analysis; embryo transfer experiments","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus conditional KO with defined phenotypes demonstrating two mechanistically distinct RBPJ functions, single lab","pmids":["24971735"],"is_preprint":false},{"year":2012,"finding":"Notch-RBP-J signaling controls expression of the transcription factor IRF8 by selectively augmenting IRAK2-dependent TLR4 signaling to kinase MNK1 and downstream eIF4E-mediated translational control, thereby regulating IRF8 protein synthesis and M1 macrophage polarization.","method":"Myeloid-specific RBP-J conditional knockout; IRF8 protein/mRNA analysis; signaling pathway inhibition (IRAK2, MNK1, eIF4E); Listeria infection model","journal":"Nature immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with pathway dissection using inhibitors; multiple orthogonal readouts but signaling steps inferred from pharmacological tools","pmids":["22610140"],"is_preprint":false},{"year":2012,"finding":"RBP-J suppresses TNF-induced osteoclastogenesis by attenuating c-Fos activation and suppressing BLIMP1 induction, thereby preventing downregulation of the transcriptional repressor IRF-8, which blocks osteoclast differentiation. Myeloid-specific RBP-J deletion converted TNF into a potent RANK-independent osteoclastogenic factor.","method":"Myeloid-specific conditional Rbpj knockout; RANK-deficient mouse model; reporter assays for c-Fos and NFATc1; in vivo inflammatory bone resorption model","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (KO alone, KO on RANK-deficient background) with defined molecular mechanism; replicated across conditions","pmids":["22249448"],"is_preprint":false},{"year":2014,"finding":"RBP-J suppresses ITAM-mediated costimulation of osteoclastogenesis by inhibiting PLCγ2 expression and function and downstream calcium-CaMKK/PYK2 signaling. RBP-J also suppresses PLCγ2 expression indirectly via a TGF-β/PLCγ2/calcium axis. Deletion of Rbpj in DAP12-deficient mice substantially rescued defects in bone remodeling.","method":"Conditional Rbpj knockout; double KO with DAP12 deficiency; calcium oscillation measurement; PLCγ2 expression and phosphorylation assays; TGF-β pathway analysis","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistatic genetic rescue experiment plus defined signaling pathway analysis, single lab","pmids":["25329696"],"is_preprint":false},{"year":2012,"finding":"Notch-RBPjk signaling suppresses osteoblast differentiation in part through Hey1-mediated inhibition of NFATc1: deletion of RBPjk increases NFATc1 expression, and Hey1 binds to and suppresses the NFATc1 promoter. Pharmacological inhibition of NFAT alleviated the high-bone-mass phenotype of RBPjk-deleted mice.","method":"Conditional Rbpjk knockout; Hey1/HeyL double knockout; ChIP (Hey1 at NFATc1 promoter); NFAT pharmacological inhibition in vivo","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (KO + pharmacological rescue) plus ChIP, single lab","pmids":["22457635"],"is_preprint":false},{"year":2013,"finding":"The RBPJ/NICD transcriptional complex is recruited to Rbpj-binding sites upstream of the Sox9 promoter, associated with transcriptional repression of Sox9, as demonstrated by ChIP in a chondrocyte differentiation cellular model. Deletion of Rbpj on a Notch gain-of-function background restores Sox9 protein levels, demonstrating Rbpj-dependent regulation of Sox9.","method":"Chromatin immunoprecipitation (ChIP); genetic rescue (Rbpj deletion on Notch GOF background); Sox9 protein expression analysis","journal":"Journal of bone and mineral research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus genetic epistasis, single lab","pmids":["22991339"],"is_preprint":false},{"year":2016,"finding":"RBPJ binds and trans-activates the Il23r promoter in Th17 cells to drive IL-23R expression, while repressing IL-10 production. In the absence of RBPJ, Th17 cells fail to upregulate IL-23R and do not induce autoimmune tissue inflammation; overexpression of IL-23R rescues pathogenicity of RBPJ-deficient Th17 cells.","method":"Conditional Rbpj knockout in T cells; ChIP (RBPJ at Il23r promoter); IL-23R overexpression rescue; in vivo autoimmune model","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus genetic rescue experiments; single lab","pmids":["27346359"],"is_preprint":false},{"year":2016,"finding":"RBP-J suppresses TNF-α-induced osteoclastogenesis by repressing miR-182 expression through binding to specific open chromatin regions in the miR-182 promoter. miR-182 promotes osteoclastogenesis by inhibiting Foxo3 and Maml1; suppression of miR-182 by RBP-J is a critical mechanism restraining TNF-induced osteoclast differentiation.","method":"High-throughput miRNA sequencing; ChIP (RBP-J at miR-182 promoter); gain/loss-of-function of miR-182; target validation (Foxo3, Maml1)","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus miRNA gain/loss-of-function with target identification, single lab","pmids":["27183593"],"is_preprint":false},{"year":2016,"finding":"In cardiomyocytes, RBPJ acts as a Notch-independent repressor of multiple pro-angiogenic and angiostatic factor genes by antagonizing hypoxia-inducible factors (HIFs). Cardiomyocyte-specific Rbpj deletion increased cardiac microvascularization and improved heart function after myocardial infarction.","method":"Cardiomyocyte-specific conditional Rbpj knockout; gene expression profiling; hypoxia/HIF pathway analysis; echocardiography and cardiac function assessment post-MI","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined molecular mechanism (HIF antagonism) and physiological readout, single lab","pmids":["27357444"],"is_preprint":false},{"year":2020,"finding":"YY1 binds the N-terminal domain of RBPJ and competes with Notch coactivator MAML1 for RBPJ binding, thereby impairing NICD/MAML1/RBPJ ternary complex formation and functioning as a repressor of Notch signaling in endothelial cells to control tip-stalk cell fate during sprouting angiogenesis.","method":"Co-immunoprecipitation; domain mapping; endothelial EC-specific YY1 knockout; retinal sprouting assay; aortic ring assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP domain mapping plus conditional KO with defined mechanism; single lab","pmids":["32075915"],"is_preprint":false},{"year":2019,"finding":"RBPJ represses naive-pluripotency factors TBX3 and NANOG to secure exit from the naive state during formative pluripotency transition in mouse ESCs, acting independently of ETV5 and TCF3. Triple deletion of Etv5, Rbpj, and Tcf3 locks ESCs in self-renewal even under differentiation stimuli.","method":"Genetic triple knockout (Etv5, Rbpj, Tcf3) in mouse ESCs; gene expression profiling; genome-wide binding analysis","journal":"Cell stem cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with defined gene expression outcomes; single lab but includes genome-wide binding data","pmids":["31031137"],"is_preprint":false},{"year":2022,"finding":"In mature T-cells lacking active Notch signaling, RBPJ functions as a repressor at Notch target genes in a Notch-independent manner through corepressor KYOT2/FHL1. Depletion of RBPJ or squelching of KYOT2/FHL1 both lead to upregulation of Notch target genes. ChIP-Seq and ATAC-seq defined four clusters of RBPJ-regulated genes, some Notch-dependent and some Notch-independent.","method":"RBPJ depletion in mature T-cells; RNA-Seq; ChIP-Seq; ATAC-Seq; NICD1 ectopic expression; KYOT2/FHL1 squelching","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multi-omic approach (RNA-Seq, ChIP-Seq, ATAC-Seq) with genetic and biochemical perturbations defining Notch-dependent vs. independent RBPJ functions","pmids":["35848919"],"is_preprint":false},{"year":2011,"finding":"ChIP-Seq in human and murine T-lymphoblastic leukemia cells reveals that Notch1 binds preferentially to RBPJ binding sites in promoters, and that RBPJ and ZNF143 binding to DNA is mutually exclusive in vitro, suggesting exchange of RBPJ/Notch1 and ZNF143 complexes at shared sites in cells. Many direct Notch1 target genes lack promoter binding and are regulated by enhancers identified near MYC, DTX1, IGF1R, IL7R, and the GIMAP cluster.","method":"ChIP-Seq for Notch1 and RBPJ; in vitro DNA binding competition assays; identification of enhancers","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-Seq plus in vitro binding competition; single lab but multiple cell types","pmids":["21737748"],"is_preprint":false},{"year":2014,"finding":"Loss of RBPJ in human cancer cell lines derepresses target gene promoters, allowing Notch-independent activation by alternate transcription factors NF-κB and MYC, which are essential for survival of RBPJ-depleted cells. Global H4ac profiling confirmed widespread transcriptional dysregulation of the cell death pathway.","method":"RBPJ depletion in human cancer cell lines; xenograft tumor growth assays; H4ac ChIP-Seq; NF-κB and MYC functional studies","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-Seq plus genetic/functional studies; single lab","pmids":["25512468"],"is_preprint":false},{"year":1999,"finding":"CBF1/RBPJ binds to the κB site of the IL-6 gene promoter in cell lines of diverse origin, acts as a negative regulator of IL-6 gene transcription upon overexpression, and induces DNA bending at the recognition site, suggesting CBF1 can influence transcription by imposing specific promoter conformation.","method":"EMSA; transfection reporter assays in HeLa cells; DNA bending assay","journal":"Nucleic acids research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, limited mechanistic follow-up beyond reporter assay and EMSA","pmids":["10373597"],"is_preprint":false},{"year":2016,"finding":"Endothelial Jagged1-RBPJ signaling promotes NF-κB-dependent transcription: the Notch1 intracellular domain (N1ICD) physically interacts with NF-κB in the nucleus, and this N1ICD-NF-κB interaction is required for reciprocal transactivation of target genes including VCAM-1 in atherosclerosis.","method":"Endothelial-specific Rbpj conditional knockout; transcriptome analysis; nuclear co-IP (N1ICD and NF-κB); intravital microscopy","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with mechanistic co-IP and transcriptomics; single lab","pmids":["27496872"],"is_preprint":false}],"current_model":"RBPJ is the central transcriptional effector of canonical Notch signaling: it constitutively occupies CGTGGGAA consensus sites on chromatin and, in the absence of Notch, recruits corepressor complexes (CIR–HDAC, L3MBTL3–LSD1/KDM1A, SHARP, KYOT2) to demethylate H3K4me2 and repress target genes; upon Notch activation, the Notch intracellular domain displaces corepressors and assembles with RBPJ and Mastermind into a transcriptional activator complex, while RBPJ also represses transcription independently of Notch—antagonizing HIFs in cardiomyocytes and interacting with ERα in uterus—and undergoes proteasomal degradation following cyclin F-mediated polyubiquitylation at Lys315 under metabolic stress."},"narrative":{"mechanistic_narrative":"RBPJ (CBF1/RBP-Jκ) is a sequence-specific DNA-binding transcription factor that serves as the central nuclear effector of canonical Notch signaling, recognizing the core GTGGGAA motif and acting as a bistable switch between repression and activation [PMID:8152928, PMID:23651858]. In the absence of Notch, RBPJ occupies target enhancers and promoters and recruits corepressor machinery — including CIR linked to histone deacetylase/SAP30 [PMID:9874765], the L3MBTL3–KDM1A/LSD1 module that demethylates H3K4me2 [PMID:29030483], and the SHARP corepressor whose interface with RBPJ is structurally defined and required for repression [PMID:30673607] — and additional polycomb-associated suppressors recruited through the KyoT2/KYOT2 adaptor (RING1, HPC2) [PMID:14999091, PMID:15710417, PMID:35848919]. Upon Notch activation, the Notch intracellular domain binds RBPJ through its RAM region and displaces corepressors to assemble an activating complex, derepressing and inducing primary targets such as HES1 to control cell-fate decisions including suppression of myogenesis [PMID:8622698, PMID:9374409, PMID:10066785]; ChIP-Seq shows RBPJ occupancy is dynamic, increasing at NICD-co-occupied sites while a separate set of sites remains bound independent of signaling state [PMID:23651858]. RBPJ also acts as a Notch-independent transcriptional regulator across tissues: it antagonizes hypoxia-inducible factors to repress angiogenic genes in cardiomyocytes [PMID:27357444], complexes with estrogen receptor α in the uterus [PMID:24971735], represses naive-pluripotency factors during the formative pluripotency transition [PMID:31031137], and binds CDK9/P-TEFb to drive transcriptional elongation in brain tumor-initiating cells [PMID:27322055]. In the immune and skeletal systems RBPJ restrains inflammatory osteoclastogenesis and shapes T-cell and macrophage programs by controlling IRF8, IL-23R, NFATc1, and miR-182 [PMID:22610140, PMID:22249448, PMID:27346359, PMID:27183593]. RBPJ protein abundance is controlled by cyclin F–mediated SCF polyubiquitylation at Lys315 under metabolic stress, targeting it for proteasomal degradation [PMID:30254149].","teleology":[{"year":1994,"claim":"Establishing the precise DNA recognition motif of RBPJ was the foundation for defining it as a sequence-specific transcription factor and identifying its genomic targets.","evidence":"EMSA with systematic mutant probes and oligonucleotide selection from random sequences","pmids":["8152928"],"confidence":"High","gaps":["In vitro motif does not establish in vivo occupancy or chromatin context","Does not address cofactor requirements for binding"]},{"year":1994,"claim":"Identification of Hairless as a direct inhibitor of Su(H)/RBPJ DNA binding revealed that RBPJ activity is negatively regulated by direct protein interactions, foreshadowing antagonist-based control.","evidence":"Purified-protein EMSA, in vitro protein interaction, and reporter assays in Drosophila S2 cells","pmids":["7958912"],"confidence":"High","gaps":["Mechanism in mammalian cells not directly tested","No structural basis for inhibition defined"]},{"year":1996,"claim":"Demonstrating that the Notch intracellular domain physically binds RBPJ and converts it from repressor to activator established RBPJ as the nuclear effector of Notch signaling.","evidence":"Two-hybrid, co-IP with truncation mapping, and reporter assays in mammalian/human cells","pmids":["8622698","8643633"],"confidence":"High","gaps":["Did not resolve corepressor identity displaced by NICD","Binding-domain mapping but no structure"]},{"year":1997,"claim":"Genetic epistasis in an RBP-J null cell line proved Notch transactivation strictly requires RBPJ and separated RAM-mediated binding from IC-mediated transactivation, defining the modular logic of the activator.","evidence":"Deletion mutants and transactivation assays in RBP-J null cells; myogenic differentiation assay","pmids":["9374409"],"confidence":"High","gaps":["Proposed corepressor competition by RAM not directly demonstrated with named corepressor"]},{"year":1998,"claim":"Showing RBPJ perturbs basal transcription machinery (TAFII110, TFIIA) provided an early mechanism for active repression independent of chromatin modifiers.","evidence":"Reconstituted in vitro transcription with protein interaction and preinitiation-complex competition assays","pmids":["9620850"],"confidence":"High","gaps":["Relative contribution versus chromatin-based repression unresolved","Drosophila TAF homolog; mammalian equivalence not shown here"]},{"year":1999,"claim":"Identification of CIR as a corepressor linking RBPJ to HDAC/SAP30 established chromatin-based repression as essential to RBPJ function via loss-of-binding mutants.","evidence":"Interaction assays, co-IP, and reporter repression with CIR-binding-defective RBPJ mutants","pmids":["9874765"],"confidence":"High","gaps":["Genome-wide relevance not assessed","Did not exclude additional corepressors"]},{"year":1999,"claim":"Ligand-induced Notch signaling was shown to directly and primarily activate HES1 through RBPJ sites, linking the molecular switch to a developmental output (myogenesis block).","evidence":"Delta1 co-culture with cycloheximide controls and constitutively active VP16-RBP-J in C2C12 cells","pmids":["10066785"],"confidence":"High","gaps":["Endogenous chromatin occupancy not directly mapped"]},{"year":2000,"claim":"SKIP and viral RPMS1 were placed within the RBPJ corepressor complex, showing how viral and cellular factors modulate the repression-to-activation transition.","evidence":"Two-hybrid, GST affinity, co-IP, colocalization, and reporter assays","pmids":["10644367","11222720"],"confidence":"Medium","gaps":["Single-lab biochemistry without structural validation","Endogenous complex stoichiometry unknown"]},{"year":2004,"claim":"The RBPJ–KyoT2–RING1 and later HPC2 findings revealed polycomb recruitment to RBPJ via an adaptor, broadening the repressive cofactor repertoire.","evidence":"Two-hybrid, GST pulldown, co-IP, and reporter transactivation with competition","pmids":["14999091","15710417"],"confidence":"Medium","gaps":["Indirect (adaptor-mediated) association; no direct RBPJ-RING1 contact","Physiological context not defined"]},{"year":2011,"claim":"Genome-wide ChIP-Seq in leukemia cells showed Notch1 binds preferentially at RBPJ promoter sites and that RBPJ/ZNF143 occupancy is mutually exclusive, introducing competitive site exchange and enhancer-based regulation.","evidence":"ChIP-Seq for Notch1 and RBPJ plus in vitro DNA-binding competition","pmids":["21737748"],"confidence":"Medium","gaps":["Functional consequence of ZNF143 exchange not established in vivo","Enhancer targets correlative"]},{"year":2013,"claim":"ChIP-Seq across two Notch states overturned the static-occupancy model, showing RBPJ binding is dynamic at NICD-co-occupied sites yet stable at a Notch-independent subset.","evidence":"ChIP-Seq for RBPJ, NICD, p300, and histone marks under active vs inhibited Notch in myogenic cells","pmids":["23651858"],"confidence":"High","gaps":["Mechanism driving dynamic recruitment unresolved","Function of static Notch-independent sites not defined here"]},{"year":2017,"claim":"Discovery of the L3MBTL3–KDM1A/LSD1 module recruited by RBPJ defined a conserved enzymatic mechanism (H3K4me2 demethylation) for default repression, with NICD competition for RBPJ as the switch.","evidence":"Proteomics, co-IP, ChIP, demethylation assays, and in vivo genetics in Drosophila and C. elegans","pmids":["29030483"],"confidence":"High","gaps":["Relative contribution versus SHARP/CIR corepressors not quantified"]},{"year":2017,"claim":"Crystal structures of RBPJ bound to RITA and (in 2019) SHARP, with structure-based mutants, defined the molecular interfaces underlying repression and the RAM-like binding mode of antagonists.","evidence":"X-ray crystallography, ITC, structure-based mutagenesis, and cellular repression assays","pmids":["28487372","30673607"],"confidence":"High","gaps":["Structures of full activator (NICD/MAML/RBPJ) on these surfaces not resolved here","In vivo relevance of each interface tissue-dependent"]},{"year":2018,"claim":"Identification of cyclin F–mediated polyubiquitylation at Lys315 established post-translational control of RBPJ abundance under metabolic stress.","evidence":"Ubiquitylation assays, Lys315 mutagenesis, proteasome inhibition, co-IP, and mouse tumor models","pmids":["30254149"],"confidence":"Medium","gaps":["Single lab; broader physiological triggers of degradation unclear","Structural impact of K315 modification unknown"]},{"year":2022,"claim":"Multi-omic dissection in mature T cells formally separated Notch-dependent from Notch-independent RBPJ regulation, showing KYOT2/FHL1-mediated repression operates without Notch at a defined gene cluster.","evidence":"RNA-Seq, ChIP-Seq, ATAC-Seq with RBPJ depletion, NICD1 expression, and KYOT2/FHL1 squelching","pmids":["35848919"],"confidence":"High","gaps":["Determinants partitioning sites into Notch-dependent vs independent clusters unresolved"]},{"year":2016,"claim":"Tissue-specific knockouts revealed broad Notch-independent RBPJ functions — HIF antagonism in cardiomyocytes, CDK9-driven elongation in brain tumor cells, immune/skeletal gene control — expanding RBPJ beyond canonical Notch.","evidence":"Conditional and cell-specific Rbpj knockouts with ChIP, proteomics, and physiological readouts","pmids":["27357444","27322055","22610140","22249448","27346359","27183593"],"confidence":"Medium","gaps":["Each Notch-independent mechanism rests largely on single-lab studies","Shared determinant of Notch-independence across tissues not defined"]},{"year":null,"claim":"How RBPJ is partitioned between activator, default-repressor, and Notch-independent functions at specific loci, and what cofactor or chromatin features dictate this choice genome-wide, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model for site-specific activator/repressor/independent assignment","Structural basis of the full activation complex on chromatin lacking","Quantitative competition between the many corepressors and NICD not reconciled"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,14,35]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,4,5,16,32]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[3,14]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[14,16,32]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[14,15,33]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,3,5,14]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,6,16,32]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[15,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,26,31]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[22,23,27]}],"complexes":["NICD/MAML/RBPJ Notch activation complex","RBPJ-CIR-HDAC/SAP30 corepressor complex","RBPJ-L3MBTL3-KDM1A/LSD1 corepressor complex","RBPJ-KyoT2-RING1 polycomb complex"],"partners":["NOTCH1","SHARP","L3MBTL3","KDM1A","CIR","KYOT2/FHL1","MAML1","ESR1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q06330","full_name":"Recombining binding protein suppressor of hairless","aliases":["CBF-1","J kappa-recombination signal-binding protein","RBP-J kappa","RBP-J","RBP-JK","Renal carcinoma antigen NY-REN-30"],"length_aa":500,"mass_kda":55.6,"function":"Transcriptional regulator that plays a central role in Notch signaling, a signaling pathway involved in cell-cell communication that regulates a broad spectrum of cell-fate determinations. Acts as a transcriptional repressor when it is not associated with Notch proteins. When associated with some NICD product of Notch proteins (Notch intracellular domain), it acts as a transcriptional activator that activates transcription of Notch target genes. Probably represses or activates transcription via the recruitment of chromatin remodeling complexes containing histone deacetylase or histone acetylase proteins, respectively. Specifically binds to the immunoglobulin kappa-type J segment recombination signal sequence. Binds specifically to methylated DNA (PubMed:21991380). Binds to the oxygen responsive element of COX4I2 and activates its transcription under hypoxia conditions (4% oxygen) (PubMed:23303788). Negatively regulates the phagocyte oxidative burst in response to bacterial infection by repressing transcription of NADPH oxidase subunits (By similarity)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q06330/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RBPJ","classification":"Not Classified","n_dependent_lines":46,"n_total_lines":1208,"dependency_fraction":0.0380794701986755},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RBPJ","total_profiled":1310},"omim":[{"mim_id":"621217","title":"BEN DOMAIN-CONTAINING PROTEIN 6; BEND6","url":"https://www.omim.org/entry/621217"},{"mim_id":"620758","title":"TRANSLOCASE OF INNER MITOCHONDRIAL MEMBRANE 23B; TIMM23B","url":"https://www.omim.org/entry/620758"},{"mim_id":"620696","title":"RBPJ-INTERACTING AND TUBULIN-ASSOCIATED PROTEIN 1; RITA1","url":"https://www.omim.org/entry/620696"},{"mim_id":"618844","title":"L3MBTL HISTONE METHYL-LYSINE-BINDING PROTEIN 3; L3MBTL3","url":"https://www.omim.org/entry/618844"},{"mim_id":"618111","title":"ZINC FINGER PROTEIN 64; ZFP64","url":"https://www.omim.org/entry/618111"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RBPJ"},"hgnc":{"alias_symbol":["SUH","IGKJRB","RBPJK","KBF2","RBP-J","CBF1"],"prev_symbol":["IGKJRB1","RBPSUH"]},"alphafold":{"accession":"Q06330","domains":[{"cath_id":"2.60.40.1450","chopping":"32-162","consensus_level":"medium","plddt":94.4632,"start":32,"end":162},{"cath_id":"2.80.10.50","chopping":"173-332","consensus_level":"medium","plddt":94.6071,"start":173,"end":332},{"cath_id":"2.60.40.10","chopping":"355-449","consensus_level":"medium","plddt":88.7956,"start":355,"end":449}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06330","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q06330-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q06330-F1-predicted_aligned_error_v6.png","plddt_mean":85.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RBPJ","jax_strain_url":"https://www.jax.org/strain/search?query=RBPJ"},"sequence":{"accession":"Q06330","fasta_url":"https://rest.uniprot.org/uniprotkb/Q06330.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q06330/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06330"}},"corpus_meta":[{"pmid":"17591855","id":"PMC_17591855","title":"Notch-RBP-J 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shift assay with mutant probes and systematic selection from random oligonucleotide pools; the protein recognizes the GTGGGAA heptanucleotide and makes weaker contacts with flanking ACT and CG sequences.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA) with systematic mutant probes; oligonucleotide selection/enrichment from random sequences\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro DNA-binding assays with systematic mutagenesis plus selection from random sequences, establishing precise recognition motif\",\n      \"pmids\": [\"8152928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The intracellular domain of mammalian Notch1 (NotchIC) physically interacts with the transcriptional repressor CBF1/RBPJ; the N-terminal 114 amino acids of NotchIC contain the CBF1-binding domain, whereas the ankyrin repeats are dispensable for this interaction. NotchIC is targeted to the transcriptional repression domain (aa 179–361) of CBF1 and transactivates gene expression by abolishing CBF1-mediated repression, the same mechanism used by EBV EBNA2.\",\n      \"method\": \"In vitro binding assay; two-hybrid cotransfection assay; co-immunoprecipitation with truncation mutants; transcriptional reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (pulldown, co-IP, reporter assays, mutant mapping) in a single rigorous study; independently replicated by multiple labs\",\n      \"pmids\": [\"8622698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Constitutively active human Notch1 (N1ΔEC) physically binds CBF1/RBPJ by co-immunoprecipitation in COS-1 cells and activates transcription through a CBF1-responsive element, demonstrating functional coupling of Notch1 and CBF1 in human cells.\",\n      \"method\": \"Co-immunoprecipitation; transcriptional reporter assay (CAT) in multiple cell lines\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus functional reporter assay, confirmed across multiple cell lines\",\n      \"pmids\": [\"8643633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Notch1 intracellular region (RAMIC) contains two separable functional domains: RAM (sufficient for RBP-J binding) and IC (transactivation domain with weaker RBP-J interaction). Transactivation by IC requires RBP-J, demonstrated using an RBP-J null cell line. The RAM domain synergistically stimulates IC transactivation, proposed to compete with a putative co-repressor for RBP-J binding. Suppression of myogenic differentiation by Notch1 correlates with RBP-J–dependent transactivation.\",\n      \"method\": \"Deletion mutant analysis; transactivation assay in RBP-J null cell line; myogenic differentiation assay with RBP-J-VP16 fusion\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic null cell line epistasis plus domain-deletion biochemistry in one study; consistent with multiple other labs\",\n      \"pmids\": [\"9374409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CBF1/RBPJ mediates transcriptional repression by binding a unique corepressor CIR, which in turn binds histone deacetylase and SAP30, linking CBF1 to the histone deacetylase complex. Two CBF1 mutants unable to bind CIR lose repressor function, establishing CIR recruitment as essential for CBF1-mediated repression.\",\n      \"method\": \"Protein-protein interaction assays; co-immunoprecipitation; reporter repression assays; CBF1 mutants defective in CIR binding\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — loss-of-function mutants with defined binding defect show loss of repression; multiple biochemical methods in one study\",\n      \"pmids\": [\"9874765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Delta1-induced Notch signaling activates transcription of RBP-J–binding motif-containing promoters including HES1, and this activation is primary (cycloheximide-insensitive). HES1 induction subsequently represses MyoD mRNA, blocking myogenic differentiation. A constitutively active VP16-RBP-J fusion recapitulates Notch-mediated inhibition of myogenesis.\",\n      \"method\": \"Co-culture with Delta1-expressing cells; cycloheximide treatment; mRNA expression analysis; VP16-RBP-J transfection in C2C12 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ligand-induced signaling system with cycloheximide controls plus constitutively active RBP-J gain-of-function; mechanism confirmed by multiple approaches\",\n      \"pmids\": [\"10066785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RBP-J represses transcription by directly interacting with two transcriptional coactivators, dTAFII110 (a TFIID subunit) and TFIIA, perturbing their optimal interactions. RBP-J does not occlude other transcription factor binding to promoters. The RBP-J interaction domain on dTAFII110 overlaps with the TFIIA-interaction domain but is distinct from the Sp1-interaction domain.\",\n      \"method\": \"In vitro transcription assay; protein-protein interaction assays; pre-formed transcription preinitiation complex competition experiments\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro transcription system with defined protein interactions and competition assays; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"9620850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The Drosophila Hairless protein directly inhibits DNA binding of both Su(H) and its human homolog KBF2/RBP-Jκ through protein-protein interactions in vitro. This inhibitory interaction is consistent with Su(H)-driven transcriptional activation being suppressed by Hairless in Drosophila S2 cells, placing Hairless as a negative regulator of Su(H)/RBPJ activity.\",\n      \"method\": \"Protein purification; EMSA; in vitro protein-protein interaction; transcriptional reporter assay in Drosophila S2 cells\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct in vitro binding assay with purified proteins plus functional cellular assay; defines mechanism of Hairless inhibition\",\n      \"pmids\": [\"7958912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SKIP interacts with the CBF1 corepressor complex components (SMRT, CIR, Sin3A, HDAC2) and also with EBNA2, and is required for efficient EBNA2-mediated activation of CBF1-dependent promoters. EBNA2 competes with the SMRT-corepressor complex for contacts on SKIP and CBF1 to relieve repression.\",\n      \"method\": \"Yeast two-hybrid screen; GST affinity assays; mammalian two-hybrid assays; immunofluorescence co-localization; transcriptional reporter assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays and functional reporter experiments, single lab\",\n      \"pmids\": [\"10644367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"EBV RPMS1 protein interacts with both CBF1/RBPJ and components of the CBF1-associated corepressor complex (Sin3A, CIR), and negatively regulates EBNA2- and NotchIC-mediated transcriptional activation by blocking relief of CBF1-mediated repression and interfering with SKIP-CIR interactions.\",\n      \"method\": \"GST affinity assays; co-immunoprecipitation; mammalian two-hybrid; immunofluorescence co-localization; reporter assays; muscle differentiation assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple complementary binding and functional assays, single lab\",\n      \"pmids\": [\"11222720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CBF1/RBPJ binds to the κB site of the IκBα promoter and represses IκBα transcription, thereby elevating basal NF-κB activity. The Notch1 intracellular domain (NICD) relieves this CBF1-mediated repression of IκBα in an RAM-domain-dependent manner, and co-activation with p300 enhances IκBα promoter function.\",\n      \"method\": \"EMSA; promoter mutagenesis; CBF1 overexpression in COS1 cells; NICD co-transfection; IκBα protein level measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — DNA-binding and functional promoter assays with site mutants and domain mutants, single lab\",\n      \"pmids\": [\"12700242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The polycomb group protein RING1 is recruited to RBP-J through the LIM protein KyoT2, forming a three-molecule RBP-J–KyoT2–RING1 complex. RING1 and RBP-J do not associate directly. Overexpression of RING1 together with KyoT2 inhibits NIC-mediated transactivation of RBP-J, and this suppression is abrogated by competing KyoT2 away from RING1.\",\n      \"method\": \"Yeast two-hybrid; GST pulldown; co-immunoprecipitation; reporter transactivation assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP plus functional reporter assays with competition experiments, single lab\",\n      \"pmids\": [\"14999091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The PcG protein HPC2 interacts with KyoT2 LIM domains and, when overexpressed, inhibits NIC-mediated transactivation of RBP-J-dependent promoters as well as transactivation by constitutively active RBP-J-VP16, establishing HPC2 as an additional co-suppressor recruited to RBP-J via KyoT2.\",\n      \"method\": \"Yeast two-hybrid; GST pulldown; co-immunoprecipitation; mammalian two-hybrid; reporter assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple binding and functional assays, single lab\",\n      \"pmids\": [\"15710417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In zebrafish, Wt1a, Foxc1a, and Rbpj physically interact with each other by GST pulldown and co-immunoprecipitation; only Rbpj binds the Notch intracellular domain (NICD). In transactivation assays, combinations of Wt1, FoxC1/2, and NICD synergistically activate the Hey1 promoter, demonstrating that these factors converge on common target genes as a physical complex to regulate podocyte fate.\",\n      \"method\": \"GST pulldown; co-immunoprecipitation; transactivation reporter assays; morpholino knockdown in zebrafish\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays plus functional reporter data, but single lab and model organism\",\n      \"pmids\": [\"21871448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ChIP-Seq in myogenic cells demonstrates that RBPJ binding is dynamic: at sites co-occupied by NICD, RBPJ binding increases upon Notch activation, contradicting a static occupancy model. A distinct subset of RBPJ sites shows static binding irrespective of Notch activity and lacks NICD or p300 co-occupancy, indicating RBPJ can occupy chromatin independently of Notch signaling state.\",\n      \"method\": \"ChIP-Seq for RBPJ, NICD, p300, H3K4me3, H3K4me1, H3K27ac under active vs. inhibitory Notch conditions\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide ChIP-Seq with multiple histone marks and co-factors under two defined signaling states; rigorous single study with multiple orthogonal chromatin readouts\",\n      \"pmids\": [\"23651858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RBPJ recruits L3MBTL3 (MBT1) and the histone demethylase KDM1A/LSD1 to enhancers of Notch target genes in the absence of NICD, leading to H3K4me2 demethylation and transcriptional repression. L3MBTL3 competes with NICD for binding to RBPJ. This mechanism is evolutionarily conserved in Drosophila and C. elegans.\",\n      \"method\": \"Proteomic/mass spectrometry identification of RBPJ interactors; co-immunoprecipitation; ChIP; H3K4me2 demethylation assays; in vivo genetic analyses in Drosophila and C. elegans\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — proteomic discovery followed by multiple biochemical validations, ChIP, and in vivo genetics across three organisms\",\n      \"pmids\": [\"29030483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The crystal structure of RBPJ bound to the corepressor SHARP and DNA was determined, revealing SHARP's mode of binding to RBPJ. Structure-based mutants of RBPJ that are deficient for SHARP binding are incapable of repressing Notch-responsive gene expression in cells, demonstrating that the RBPJ–SHARP interface is essential for RBPJ's repressor function.\",\n      \"method\": \"X-ray crystallography; biophysical binding assays; structure-based mutagenesis; cellular transcriptional repression assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with structure-based mutagenesis and cellular functional assays in one rigorous study\",\n      \"pmids\": [\"30673607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The X-ray structure of RBPJ bound to RITA and DNA was determined, showing RITA binds RBPJ similarly to the RAM domain of Notch. Structure-based mutants and ITC measurements mapped binding regions; biochemical/cellular assays showed RITA interacts with additional regions beyond the RAM-like interface. RITA-mediated down-regulation of Notch target genes requires RBP-J/RITA complex formation.\",\n      \"method\": \"X-ray crystallography; isothermal titration calorimetry; biochemical binding assays; cellular reporter assays; endogenous co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with biophysical validation and cellular functional assays, single lab\",\n      \"pmids\": [\"28487372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cyclin F (an SCF E3 ubiquitin ligase substrate-recognition subunit) mediates polyubiquitylation of RBPJ at Lys315 under metabolic stress, leading to proteasomal degradation of RBPJ. This degradation is induced in a FOXO1-dependent manner and attenuates RBPJ-dependent IDH1 expression.\",\n      \"method\": \"Ubiquitylation assays; site-directed mutagenesis (Lys315); proteasome inhibitor experiments; co-immunoprecipitation; mouse tumor models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitylation assays with defined lysine site plus in vivo mouse model, single lab\",\n      \"pmids\": [\"30254149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RBPJ maintains brain tumor-initiating cells (BTICs) by binding CDK9 (a component of P-TEFb) at target gene promoters to enhance transcriptional elongation. MYC binds the RBPJ promoter and drives RBPJ expression in BTICs. This RBPJ function is distinct from canonical Notch signaling.\",\n      \"method\": \"Proteomics (RBPJ interactome); ChIP; shRNA knockdown; tumor growth assays; BET bromodomain inhibitor treatment\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic identification of CDK9 interaction confirmed by ChIP, but mechanism details rely on single lab\",\n      \"pmids\": [\"27322055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RBPJ-Inhibitor-1 (RIN1), a small molecule, disrupts the interaction between NOTCH ICD and RBPJ, and also blocks the functional interaction of RBPJ with SHARP, inhibiting both the activating (NOTCH-bound) and repressing (SHARP-bound) complexes of RBPJ. Gene expression changes induced by RIN1 resemble siRNA silencing of RBPJ.\",\n      \"method\": \"Small-molecule screen; protein-protein interaction assays; gene expression profiling; cell proliferation assays; C2C12 differentiation assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chemical biology with parallel RNAi comparison, but mechanistic details limited by abstract\",\n      \"pmids\": [\"31346210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Uterine RBPJ interacts physically with estrogen receptor α (ERα) in a Notch pathway-independent manner to regulate uterine lumen shape transformation prior to embryo attachment. At post-implantation stages, RBPJ directly regulates uterine matrix metalloproteinase expression in a Notch pathway-dependent manner for decidual remodeling.\",\n      \"method\": \"Conditional knockout mice (uterine-specific Rbpj deletion); co-immunoprecipitation (RBPJ–ERα); gene expression analysis; embryo transfer experiments\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus conditional KO with defined phenotypes demonstrating two mechanistically distinct RBPJ functions, single lab\",\n      \"pmids\": [\"24971735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Notch-RBP-J signaling controls expression of the transcription factor IRF8 by selectively augmenting IRAK2-dependent TLR4 signaling to kinase MNK1 and downstream eIF4E-mediated translational control, thereby regulating IRF8 protein synthesis and M1 macrophage polarization.\",\n      \"method\": \"Myeloid-specific RBP-J conditional knockout; IRF8 protein/mRNA analysis; signaling pathway inhibition (IRAK2, MNK1, eIF4E); Listeria infection model\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with pathway dissection using inhibitors; multiple orthogonal readouts but signaling steps inferred from pharmacological tools\",\n      \"pmids\": [\"22610140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RBP-J suppresses TNF-induced osteoclastogenesis by attenuating c-Fos activation and suppressing BLIMP1 induction, thereby preventing downregulation of the transcriptional repressor IRF-8, which blocks osteoclast differentiation. Myeloid-specific RBP-J deletion converted TNF into a potent RANK-independent osteoclastogenic factor.\",\n      \"method\": \"Myeloid-specific conditional Rbpj knockout; RANK-deficient mouse model; reporter assays for c-Fos and NFATc1; in vivo inflammatory bone resorption model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (KO alone, KO on RANK-deficient background) with defined molecular mechanism; replicated across conditions\",\n      \"pmids\": [\"22249448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RBP-J suppresses ITAM-mediated costimulation of osteoclastogenesis by inhibiting PLCγ2 expression and function and downstream calcium-CaMKK/PYK2 signaling. RBP-J also suppresses PLCγ2 expression indirectly via a TGF-β/PLCγ2/calcium axis. Deletion of Rbpj in DAP12-deficient mice substantially rescued defects in bone remodeling.\",\n      \"method\": \"Conditional Rbpj knockout; double KO with DAP12 deficiency; calcium oscillation measurement; PLCγ2 expression and phosphorylation assays; TGF-β pathway analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic genetic rescue experiment plus defined signaling pathway analysis, single lab\",\n      \"pmids\": [\"25329696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Notch-RBPjk signaling suppresses osteoblast differentiation in part through Hey1-mediated inhibition of NFATc1: deletion of RBPjk increases NFATc1 expression, and Hey1 binds to and suppresses the NFATc1 promoter. Pharmacological inhibition of NFAT alleviated the high-bone-mass phenotype of RBPjk-deleted mice.\",\n      \"method\": \"Conditional Rbpjk knockout; Hey1/HeyL double knockout; ChIP (Hey1 at NFATc1 promoter); NFAT pharmacological inhibition in vivo\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (KO + pharmacological rescue) plus ChIP, single lab\",\n      \"pmids\": [\"22457635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The RBPJ/NICD transcriptional complex is recruited to Rbpj-binding sites upstream of the Sox9 promoter, associated with transcriptional repression of Sox9, as demonstrated by ChIP in a chondrocyte differentiation cellular model. Deletion of Rbpj on a Notch gain-of-function background restores Sox9 protein levels, demonstrating Rbpj-dependent regulation of Sox9.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP); genetic rescue (Rbpj deletion on Notch GOF background); Sox9 protein expression analysis\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus genetic epistasis, single lab\",\n      \"pmids\": [\"22991339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RBPJ binds and trans-activates the Il23r promoter in Th17 cells to drive IL-23R expression, while repressing IL-10 production. In the absence of RBPJ, Th17 cells fail to upregulate IL-23R and do not induce autoimmune tissue inflammation; overexpression of IL-23R rescues pathogenicity of RBPJ-deficient Th17 cells.\",\n      \"method\": \"Conditional Rbpj knockout in T cells; ChIP (RBPJ at Il23r promoter); IL-23R overexpression rescue; in vivo autoimmune model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus genetic rescue experiments; single lab\",\n      \"pmids\": [\"27346359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RBP-J suppresses TNF-α-induced osteoclastogenesis by repressing miR-182 expression through binding to specific open chromatin regions in the miR-182 promoter. miR-182 promotes osteoclastogenesis by inhibiting Foxo3 and Maml1; suppression of miR-182 by RBP-J is a critical mechanism restraining TNF-induced osteoclast differentiation.\",\n      \"method\": \"High-throughput miRNA sequencing; ChIP (RBP-J at miR-182 promoter); gain/loss-of-function of miR-182; target validation (Foxo3, Maml1)\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus miRNA gain/loss-of-function with target identification, single lab\",\n      \"pmids\": [\"27183593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In cardiomyocytes, RBPJ acts as a Notch-independent repressor of multiple pro-angiogenic and angiostatic factor genes by antagonizing hypoxia-inducible factors (HIFs). Cardiomyocyte-specific Rbpj deletion increased cardiac microvascularization and improved heart function after myocardial infarction.\",\n      \"method\": \"Cardiomyocyte-specific conditional Rbpj knockout; gene expression profiling; hypoxia/HIF pathway analysis; echocardiography and cardiac function assessment post-MI\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined molecular mechanism (HIF antagonism) and physiological readout, single lab\",\n      \"pmids\": [\"27357444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"YY1 binds the N-terminal domain of RBPJ and competes with Notch coactivator MAML1 for RBPJ binding, thereby impairing NICD/MAML1/RBPJ ternary complex formation and functioning as a repressor of Notch signaling in endothelial cells to control tip-stalk cell fate during sprouting angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation; domain mapping; endothelial EC-specific YY1 knockout; retinal sprouting assay; aortic ring assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP domain mapping plus conditional KO with defined mechanism; single lab\",\n      \"pmids\": [\"32075915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RBPJ represses naive-pluripotency factors TBX3 and NANOG to secure exit from the naive state during formative pluripotency transition in mouse ESCs, acting independently of ETV5 and TCF3. Triple deletion of Etv5, Rbpj, and Tcf3 locks ESCs in self-renewal even under differentiation stimuli.\",\n      \"method\": \"Genetic triple knockout (Etv5, Rbpj, Tcf3) in mouse ESCs; gene expression profiling; genome-wide binding analysis\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with defined gene expression outcomes; single lab but includes genome-wide binding data\",\n      \"pmids\": [\"31031137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In mature T-cells lacking active Notch signaling, RBPJ functions as a repressor at Notch target genes in a Notch-independent manner through corepressor KYOT2/FHL1. Depletion of RBPJ or squelching of KYOT2/FHL1 both lead to upregulation of Notch target genes. ChIP-Seq and ATAC-seq defined four clusters of RBPJ-regulated genes, some Notch-dependent and some Notch-independent.\",\n      \"method\": \"RBPJ depletion in mature T-cells; RNA-Seq; ChIP-Seq; ATAC-Seq; NICD1 ectopic expression; KYOT2/FHL1 squelching\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multi-omic approach (RNA-Seq, ChIP-Seq, ATAC-Seq) with genetic and biochemical perturbations defining Notch-dependent vs. independent RBPJ functions\",\n      \"pmids\": [\"35848919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ChIP-Seq in human and murine T-lymphoblastic leukemia cells reveals that Notch1 binds preferentially to RBPJ binding sites in promoters, and that RBPJ and ZNF143 binding to DNA is mutually exclusive in vitro, suggesting exchange of RBPJ/Notch1 and ZNF143 complexes at shared sites in cells. Many direct Notch1 target genes lack promoter binding and are regulated by enhancers identified near MYC, DTX1, IGF1R, IL7R, and the GIMAP cluster.\",\n      \"method\": \"ChIP-Seq for Notch1 and RBPJ; in vitro DNA binding competition assays; identification of enhancers\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-Seq plus in vitro binding competition; single lab but multiple cell types\",\n      \"pmids\": [\"21737748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Loss of RBPJ in human cancer cell lines derepresses target gene promoters, allowing Notch-independent activation by alternate transcription factors NF-κB and MYC, which are essential for survival of RBPJ-depleted cells. Global H4ac profiling confirmed widespread transcriptional dysregulation of the cell death pathway.\",\n      \"method\": \"RBPJ depletion in human cancer cell lines; xenograft tumor growth assays; H4ac ChIP-Seq; NF-κB and MYC functional studies\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-Seq plus genetic/functional studies; single lab\",\n      \"pmids\": [\"25512468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CBF1/RBPJ binds to the κB site of the IL-6 gene promoter in cell lines of diverse origin, acts as a negative regulator of IL-6 gene transcription upon overexpression, and induces DNA bending at the recognition site, suggesting CBF1 can influence transcription by imposing specific promoter conformation.\",\n      \"method\": \"EMSA; transfection reporter assays in HeLa cells; DNA bending assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, limited mechanistic follow-up beyond reporter assay and EMSA\",\n      \"pmids\": [\"10373597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Endothelial Jagged1-RBPJ signaling promotes NF-κB-dependent transcription: the Notch1 intracellular domain (N1ICD) physically interacts with NF-κB in the nucleus, and this N1ICD-NF-κB interaction is required for reciprocal transactivation of target genes including VCAM-1 in atherosclerosis.\",\n      \"method\": \"Endothelial-specific Rbpj conditional knockout; transcriptome analysis; nuclear co-IP (N1ICD and NF-κB); intravital microscopy\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with mechanistic co-IP and transcriptomics; single lab\",\n      \"pmids\": [\"27496872\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RBPJ is the central transcriptional effector of canonical Notch signaling: it constitutively occupies CGTGGGAA consensus sites on chromatin and, in the absence of Notch, recruits corepressor complexes (CIR–HDAC, L3MBTL3–LSD1/KDM1A, SHARP, KYOT2) to demethylate H3K4me2 and repress target genes; upon Notch activation, the Notch intracellular domain displaces corepressors and assembles with RBPJ and Mastermind into a transcriptional activator complex, while RBPJ also represses transcription independently of Notch—antagonizing HIFs in cardiomyocytes and interacting with ERα in uterus—and undergoes proteasomal degradation following cyclin F-mediated polyubiquitylation at Lys315 under metabolic stress.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RBPJ (CBF1/RBP-Jκ) is a sequence-specific DNA-binding transcription factor that serves as the central nuclear effector of canonical Notch signaling, recognizing the core GTGGGAA motif and acting as a bistable switch between repression and activation [#0, #14]. In the absence of Notch, RBPJ occupies target enhancers and promoters and recruits corepressor machinery — including CIR linked to histone deacetylase/SAP30 [#4], the L3MBTL3–KDM1A/LSD1 module that demethylates H3K4me2 [#15], and the SHARP corepressor whose interface with RBPJ is structurally defined and required for repression [#16] — and additional polycomb-associated suppressors recruited through the KyoT2/KYOT2 adaptor (RING1, HPC2) [#11, #12, #32]. Upon Notch activation, the Notch intracellular domain binds RBPJ through its RAM region and displaces corepressors to assemble an activating complex, derepressing and inducing primary targets such as HES1 to control cell-fate decisions including suppression of myogenesis [#1, #3, #5]; ChIP-Seq shows RBPJ occupancy is dynamic, increasing at NICD-co-occupied sites while a separate set of sites remains bound independent of signaling state [#14]. RBPJ also acts as a Notch-independent transcriptional regulator across tissues: it antagonizes hypoxia-inducible factors to repress angiogenic genes in cardiomyocytes [#29], complexes with estrogen receptor α in the uterus [#21], represses naive-pluripotency factors during the formative pluripotency transition [#31], and binds CDK9/P-TEFb to drive transcriptional elongation in brain tumor-initiating cells [#19]. In the immune and skeletal systems RBPJ restrains inflammatory osteoclastogenesis and shapes T-cell and macrophage programs by controlling IRF8, IL-23R, NFATc1, and miR-182 [#22, #23, #27, #28]. RBPJ protein abundance is controlled by cyclin F–mediated SCF polyubiquitylation at Lys315 under metabolic stress, targeting it for proteasomal degradation [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing the precise DNA recognition motif of RBPJ was the foundation for defining it as a sequence-specific transcription factor and identifying its genomic targets.\",\n      \"evidence\": \"EMSA with systematic mutant probes and oligonucleotide selection from random sequences\",\n      \"pmids\": [\"8152928\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro motif does not establish in vivo occupancy or chromatin context\", \"Does not address cofactor requirements for binding\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Identification of Hairless as a direct inhibitor of Su(H)/RBPJ DNA binding revealed that RBPJ activity is negatively regulated by direct protein interactions, foreshadowing antagonist-based control.\",\n      \"evidence\": \"Purified-protein EMSA, in vitro protein interaction, and reporter assays in Drosophila S2 cells\",\n      \"pmids\": [\"7958912\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism in mammalian cells not directly tested\", \"No structural basis for inhibition defined\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Demonstrating that the Notch intracellular domain physically binds RBPJ and converts it from repressor to activator established RBPJ as the nuclear effector of Notch signaling.\",\n      \"evidence\": \"Two-hybrid, co-IP with truncation mapping, and reporter assays in mammalian/human cells\",\n      \"pmids\": [\"8622698\", \"8643633\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve corepressor identity displaced by NICD\", \"Binding-domain mapping but no structure\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Genetic epistasis in an RBP-J null cell line proved Notch transactivation strictly requires RBPJ and separated RAM-mediated binding from IC-mediated transactivation, defining the modular logic of the activator.\",\n      \"evidence\": \"Deletion mutants and transactivation assays in RBP-J null cells; myogenic differentiation assay\",\n      \"pmids\": [\"9374409\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Proposed corepressor competition by RAM not directly demonstrated with named corepressor\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showing RBPJ perturbs basal transcription machinery (TAFII110, TFIIA) provided an early mechanism for active repression independent of chromatin modifiers.\",\n      \"evidence\": \"Reconstituted in vitro transcription with protein interaction and preinitiation-complex competition assays\",\n      \"pmids\": [\"9620850\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution versus chromatin-based repression unresolved\", \"Drosophila TAF homolog; mammalian equivalence not shown here\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of CIR as a corepressor linking RBPJ to HDAC/SAP30 established chromatin-based repression as essential to RBPJ function via loss-of-binding mutants.\",\n      \"evidence\": \"Interaction assays, co-IP, and reporter repression with CIR-binding-defective RBPJ mutants\",\n      \"pmids\": [\"9874765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide relevance not assessed\", \"Did not exclude additional corepressors\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Ligand-induced Notch signaling was shown to directly and primarily activate HES1 through RBPJ sites, linking the molecular switch to a developmental output (myogenesis block).\",\n      \"evidence\": \"Delta1 co-culture with cycloheximide controls and constitutively active VP16-RBP-J in C2C12 cells\",\n      \"pmids\": [\"10066785\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous chromatin occupancy not directly mapped\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"SKIP and viral RPMS1 were placed within the RBPJ corepressor complex, showing how viral and cellular factors modulate the repression-to-activation transition.\",\n      \"evidence\": \"Two-hybrid, GST affinity, co-IP, colocalization, and reporter assays\",\n      \"pmids\": [\"10644367\", \"11222720\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab biochemistry without structural validation\", \"Endogenous complex stoichiometry unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The RBPJ–KyoT2–RING1 and later HPC2 findings revealed polycomb recruitment to RBPJ via an adaptor, broadening the repressive cofactor repertoire.\",\n      \"evidence\": \"Two-hybrid, GST pulldown, co-IP, and reporter transactivation with competition\",\n      \"pmids\": [\"14999091\", \"15710417\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Indirect (adaptor-mediated) association; no direct RBPJ-RING1 contact\", \"Physiological context not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Genome-wide ChIP-Seq in leukemia cells showed Notch1 binds preferentially at RBPJ promoter sites and that RBPJ/ZNF143 occupancy is mutually exclusive, introducing competitive site exchange and enhancer-based regulation.\",\n      \"evidence\": \"ChIP-Seq for Notch1 and RBPJ plus in vitro DNA-binding competition\",\n      \"pmids\": [\"21737748\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of ZNF143 exchange not established in vivo\", \"Enhancer targets correlative\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"ChIP-Seq across two Notch states overturned the static-occupancy model, showing RBPJ binding is dynamic at NICD-co-occupied sites yet stable at a Notch-independent subset.\",\n      \"evidence\": \"ChIP-Seq for RBPJ, NICD, p300, and histone marks under active vs inhibited Notch in myogenic cells\",\n      \"pmids\": [\"23651858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism driving dynamic recruitment unresolved\", \"Function of static Notch-independent sites not defined here\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery of the L3MBTL3–KDM1A/LSD1 module recruited by RBPJ defined a conserved enzymatic mechanism (H3K4me2 demethylation) for default repression, with NICD competition for RBPJ as the switch.\",\n      \"evidence\": \"Proteomics, co-IP, ChIP, demethylation assays, and in vivo genetics in Drosophila and C. elegans\",\n      \"pmids\": [\"29030483\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution versus SHARP/CIR corepressors not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Crystal structures of RBPJ bound to RITA and (in 2019) SHARP, with structure-based mutants, defined the molecular interfaces underlying repression and the RAM-like binding mode of antagonists.\",\n      \"evidence\": \"X-ray crystallography, ITC, structure-based mutagenesis, and cellular repression assays\",\n      \"pmids\": [\"28487372\", \"30673607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures of full activator (NICD/MAML/RBPJ) on these surfaces not resolved here\", \"In vivo relevance of each interface tissue-dependent\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of cyclin F–mediated polyubiquitylation at Lys315 established post-translational control of RBPJ abundance under metabolic stress.\",\n      \"evidence\": \"Ubiquitylation assays, Lys315 mutagenesis, proteasome inhibition, co-IP, and mouse tumor models\",\n      \"pmids\": [\"30254149\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; broader physiological triggers of degradation unclear\", \"Structural impact of K315 modification unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Multi-omic dissection in mature T cells formally separated Notch-dependent from Notch-independent RBPJ regulation, showing KYOT2/FHL1-mediated repression operates without Notch at a defined gene cluster.\",\n      \"evidence\": \"RNA-Seq, ChIP-Seq, ATAC-Seq with RBPJ depletion, NICD1 expression, and KYOT2/FHL1 squelching\",\n      \"pmids\": [\"35848919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants partitioning sites into Notch-dependent vs independent clusters unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Tissue-specific knockouts revealed broad Notch-independent RBPJ functions — HIF antagonism in cardiomyocytes, CDK9-driven elongation in brain tumor cells, immune/skeletal gene control — expanding RBPJ beyond canonical Notch.\",\n      \"evidence\": \"Conditional and cell-specific Rbpj knockouts with ChIP, proteomics, and physiological readouts\",\n      \"pmids\": [\"27357444\", \"27322055\", \"22610140\", \"22249448\", \"27346359\", \"27183593\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each Notch-independent mechanism rests largely on single-lab studies\", \"Shared determinant of Notch-independence across tissues not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RBPJ is partitioned between activator, default-repressor, and Notch-independent functions at specific loci, and what cofactor or chromatin features dictate this choice genome-wide, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model for site-specific activator/repressor/independent assignment\", \"Structural basis of the full activation complex on chromatin lacking\", \"Quantitative competition between the many corepressors and NICD not reconciled\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 14, 35]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 4, 5, 16, 32]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [3, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [14, 16, 32]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [14, 15, 33]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 3, 5, 14]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 6, 16, 32]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [15, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 26, 31]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [22, 23, 27]}\n    ],\n    \"complexes\": [\n      \"NICD/MAML/RBPJ Notch activation complex\",\n      \"RBPJ-CIR-HDAC/SAP30 corepressor complex\",\n      \"RBPJ-L3MBTL3-KDM1A/LSD1 corepressor complex\",\n      \"RBPJ-KyoT2-RING1 polycomb complex\"\n    ],\n    \"partners\": [\n      \"NOTCH1\",\n      \"SHARP\",\n      \"L3MBTL3\",\n      \"KDM1A\",\n      \"CIR\",\n      \"KYOT2/FHL1\",\n      \"MAML1\",\n      \"ESR1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}