{"gene":"NOTCH4","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1996,"finding":"Notch4 is a transmembrane receptor with EGF-like repeats and intracellular domain; the int-3 oncogene encodes only the intracellular domain of Notch4, and loss of the extracellular domain leads to constitutive activation. Notch4 transcripts are primarily restricted to endothelial cells in embryonic and adult life.","method":"cDNA cloning, deduced amino acid sequence analysis, in situ hybridization","journal":"Development","confidence":"High","confidence_rationale":"Tier 1 / Strong — foundational structural characterization with in situ hybridization for localization, replicated across multiple subsequent studies","pmids":["8681805"],"is_preprint":false},{"year":1997,"finding":"NOTCH4 (INT3) protein contains 29 EGF-like repeats (instead of 36 in other Notch homologs); all MMTV-induced tumorigenic INT3 mutations result from proviral insertions that cause expression of only the intracellular domain, demonstrating that constitutive activation occurs in the absence of the extracellular domain and LIN12 repeat regulatory sequences.","method":"Nucleotide sequence analysis, characterization of host-viral junction fragments from nine independent mammary tumors","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct sequence analysis of nine independent tumors, consistent mechanistic conclusion","pmids":["9150355"],"is_preprint":false},{"year":1998,"finding":"The human NOTCH4 protein contains 29 EGF-like repeats, 3 Notch/lin-12 repeats, a transmembrane region, 6 cdc10/ankyrin repeats, and a PEST domain; two alternatively spliced isoforms (NOTCH4(L) and NOTCH4(S)) were identified; the promoter is TATA-less and contains RBP-Jkappa and GATA recognition sites.","method":"Genomic sequencing, Northern blot, cDNA isoform characterization","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 1 / Strong — complete genomic sequence and structural characterization, replicated functional domain assignments","pmids":["9693032"],"is_preprint":false},{"year":1998,"finding":"The activated Notch4(int-3) oncoprotein inhibits HGF- and TGF-beta2-induced branching morphogenesis of mammary epithelial cells. The minimal domain required for this inhibition consists of the CBF-1 (RBP-Jkappa) interaction domain and the cdc10/ankyrin repeat domain. Wnt-1 can overcome Notch4-mediated inhibition of branching morphogenesis.","method":"3D collagen gel branching morphogenesis assay, deletion mutant analysis in TAC-2 mammary epithelial cells","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution in cell-based assay with deletion mutagenesis defining required domains","pmids":["9576833"],"is_preprint":false},{"year":2000,"finding":"Activated Notch4/int-3 (lacking most of the extracellular domain) disrupts normal alveolar epithelial morphogenesis and induces invasion of the extracellular matrix by mammary epithelial cells, and disrupts contact inhibition of proliferation.","method":"3D collagen gel morphogenesis assay, invasion assay in TAC-2 cells expressing Notch4(int-3)","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss/gain of function with defined cellular phenotype, two orthogonal readouts (morphogenesis and invasion)","pmids":["10797286"],"is_preprint":false},{"year":2000,"finding":"Both activated Notch4/int-3 and Jagged-1 induce microvessel-like structures in rat brain endothelial cells. Activation of Notch signaling was confirmed by induction of endogenous Notch4 and Jagged-1 genes and proteins. Full-length Notch4 (without activation) did not affect these cells.","method":"Ectopic expression in RBE4 rat brain endothelial cells, morphological and biochemical characterization","journal":"Microvascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with defined phenotype and endogenous target gene induction as readout","pmids":["10964583"],"is_preprint":false},{"year":2001,"finding":"Expression of activated Notch4 in embryonic endothelium (under Flk1/VEGFR regulation) causes embryonic lethality, restricted vascular development, disorganized vascular networks, large dilated vessels with compromised wall integrity, and abnormal yolk-sac vasculature, implicating Notch4 in vessel patterning and remodeling.","method":"Transgenic mouse model with Flk1-driven activated Notch4, in vivo vascular phenotyping","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo gain-of-function with defined vascular phenotype, replicated in subsequent studies","pmids":["11344305"],"is_preprint":false},{"year":2002,"finding":"Constitutively active Notch4 inhibits endothelial sprouting and VEGF-induced angiogenesis. The mechanism involves activation of beta1-integrin into a high-affinity conformation (not increased surface expression), leading to increased adhesion to collagen and inhibition of migration through collagen. Activation of beta1-integrins alone is sufficient to inhibit VEGF-induced sprouting.","method":"In vitro endothelial sprouting assay (HMEC-1 cells), chick chorioallantoic membrane in vivo assay, flow cytometry for integrin conformation, function-activating beta1-integrin antibodies","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal in vitro and in vivo assays with mechanistic dissection of integrin activation state","pmids":["11909975"],"is_preprint":false},{"year":2003,"finding":"Constitutively active Notch4 intracellular domain inhibits endothelial apoptosis triggered by LPS via two mechanisms: (1) RBP-Jkappa-dependent inhibition of the JNK proapoptotic pathway, and (2) RBP-Jkappa-independent upregulation of Bcl-2. A Notch4 mutant lacking the RAM domain showed only partial anti-apoptotic activity but equivalent RBP-Jkappa transcriptional activation.","method":"Apoptosis assays in endothelial cells, RBP-Jkappa reporter assays, RAM-domain deletion mutants, Bcl-2 western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mechanistic dissection with deletion mutagenesis and two orthogonal pathway readouts in single study","pmids":["14701863"],"is_preprint":false},{"year":2004,"finding":"Notch4-induced inhibition of endothelial sprouting requires the ankyrin repeats but not the RAM domain or C-terminal region. The ankyrin repeats alone are sufficient for RBP-Jkappa-dependent gene upregulation and partial inhibition of sprouting. N4IC reduced VEGFR-2 and VE-cadherin expression, but neither event alone is necessary and sufficient to explain inhibition. A constitutively active RBP-Jkappa mutant inhibits sprouting less strongly than full N4IC, suggesting RBP-Jkappa-dependent and -independent mechanisms.","method":"Quantitative endothelial sprouting assay with N4IC deletion mutants, RBP-Jkappa reporter assays, VEGFR-2/VE-cadherin expression analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Moderate — deletion mutagenesis defining required domain, multiple readouts, mechanistic dissection of RBP-Jkappa dependence","pmids":["15187023"],"is_preprint":false},{"year":2004,"finding":"Constitutively active Notch4 (Notch4-IC) in human hematopoietic progenitors reduces colony-forming and short-term proliferative ability while increasing primitive progenitor content in long-term cultures. In vivo, Notch4-IC-transduced cells engraft more efficiently and generate an immature CD4+CD8+ T-cell population while blocking B-cell development.","method":"Retroviral transduction of human marrow/cord cells, long-term culture assay, transplantation into beta2-microglobulin-/- NOD/SCID mice","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo gain-of-function with defined hematopoietic phenotypes","pmids":["15231576"],"is_preprint":false},{"year":2004,"finding":"The ANK domain and C-terminal domain of Int-3 (constitutively active Notch4) are important for inhibition of differentiation and growth arrest in myeloid leukemia cells. Expression of Int-3 in mouse bone marrow stem cells inhibits differentiation and expands colony-forming progenitors 3-5 fold.","method":"Retroviral transduction with Int-3 deletion mutants in HL-60 cells and mouse bone marrow, colony-forming assays, cell cycle analysis","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain deletion mutagenesis with defined functional readout in two cell systems","pmids":["14961038"],"is_preprint":false},{"year":2005,"finding":"Notch4 intracellular domain (ICD4) binds to Smad2, Smad3, and Smad4 (with highest affinity to Smad3 via its MH2 domain, independent of the RAM23 region). ICD4 attenuates TGF-beta signaling: cells expressing ICD4 resist TGF-beta growth inhibition, and ICD4 inhibits Smad-binding element and 3TP luciferase reporter activity and PAI-1 expression. Blocking Notch4 processing by gamma-secretase inhibitor restores TGF-beta sensitivity in MCF-7 cells.","method":"Co-immunoprecipitation/binding assay, deletion analysis, luciferase reporter assays, RT-PCR, western blot, gamma-secretase inhibitor treatment","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding shown with deletion analysis, multiple functional readouts confirming pathway inhibition, single lab with orthogonal methods","pmids":["16007227"],"is_preprint":false},{"year":2005,"finding":"NOTCH4 transcription in endothelial cells is regulated by cell-type-specific AP-1 complexes that occupy NOTCH4 chromatin. Intron 1 or upstream sequences are required for expression in the vasculature of transgenic mouse embryos. Vascular angiogenic factors activate AP-1 and can reprogram the endogenous NOTCH4 gene from a repressed to a transcriptionally active state in non-endothelial cells (HeLa).","method":"ChIP, RNA FISH, transfection assays, transgenic mice, endothelial cell-specific histone modification mapping","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (ChIP, transgenic reporter, RNA FISH, transfection) defining transcriptional mechanism","pmids":["15684396"],"is_preprint":false},{"year":2005,"finding":"Endothelial expression of constitutively active Notch4 (int3) in adult mice causes profound blood vessel enlargement, AV shunting (hallmarks of AVM), and lethality. This is accompanied by arterialization including ectopic venous expression of ephrinB2, increased smooth muscle cells, and upregulation of endogenous Notch signaling. Repression of int3 expression reverses the vascular defects. Constitutively active Notch1 induces similar hepatic vascular lesions.","method":"Tetracycline-repressible transgenic system with endothelial-specific expression, vascular phenotyping, ephrinB2 immunostaining, doxycycline rescue","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible/reversible in vivo gain-of-function with mechanistic markers (ephrinB2, SMC), disease reversal upon repression","pmids":["15994223"],"is_preprint":false},{"year":2006,"finding":"VEGF upregulates DLL4 and presenilin, leading to activation of Notch4, which in turn upregulates ephrin B2 and downregulates EphB4, directing the differentiation of venous endothelial cells toward an arterial phenotype. Disruption of Notch4 signaling by presenilin inhibition or soluble DLL4 inhibits VEGF-induced venous endothelial cell migration and differentiation.","method":"In vitro HUVEC treatment, western blot, pharmacological inhibition (presenilin inhibitor, soluble DLL4), in vivo transgenic hepatocarcinoma mouse model with immunostaining","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway ordering demonstrated by pharmacological inhibition and in vivo expression data; single lab","pmids":["16951162"],"is_preprint":false},{"year":2007,"finding":"AP-1 and the glucocorticoid receptor (GR) synergistically activate Notch4 transcription in endothelial cells through a composite response element (imperfect half-glucocorticoid response element + AP-1 motif) in the Notch4 promoter. FGF-2 induces AP-1 occupancy and cortisol induces GR occupancy at this element; AP-1 stabilizes GR occupancy. In multipotent 10T1/2 cells, FGF-2 and cortisol reprogram the Notch4 locus from repressed to active state.","method":"ChIP, luciferase reporter assays, histone modification analysis, transfection in endothelial and 10T1/2 cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP-confirmed occupancy with composite response element, multiple orthogonal methods in one study","pmids":["17220278"],"is_preprint":false},{"year":2008,"finding":"Constitutively active Notch4 in endothelial cells from birth causes brain AVMs (cerebral AV shunting, vessel enlargement, hemorrhage, neuronal death) in mice by 3 weeks. Repression of Notch4* (int3) resolves ataxia and reverses disease progression. int3 expression results in enlarged microvasculature coinciding with reduced capillary density, linking vessel enlargement to Notch's inhibition of vessel sprouting.","method":"Tetracycline-regulatable transgenic system (endothelial-specific, from birth), vascular phenotyping, doxycycline-mediated repression and disease reversal","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible and reversible in vivo model with mechanistic link to sprouting inhibition; disease reversal confirms requirement","pmids":["18667694"],"is_preprint":false},{"year":2008,"finding":"Notch4 and Hes1 knockdown in endothelial cells enhances VCAM-1 expression, promotes apoptosis, and inhibits repair of endothelial injury, demonstrating that basal Notch4 activity is required to maintain EC quiescence and survival. TNFα decreases Notch4 expression predominantly via PI3-kinase signaling pathways, reducing CBF1 activity and Hes1 expression.","method":"siRNA knockdown, VCAM-1 expression assay, apoptosis assay, endothelial injury/repair assay, CBF1 reporter assay in arterial endothelial cells","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with defined cellular phenotypes and pathway reporter; single lab","pmids":["18802018"],"is_preprint":false},{"year":2008,"finding":"Rbpj conditional knockout in Notch4/Int3-expressing mammary glands normalizes mammary gland development (demonstrating developmental arrest requires RBP-Jkappa-dependent signaling), but mammary tumor development still occurs in Rbpj-null/Int3 mice, demonstrating that Notch4-induced mammary tumorigenesis is independent of RBP-Jkappa interaction.","method":"Conditional Rbpj knockout (Wap-Cre) in Wap-Int3 transgenic mice, mammary gland histology, tumor frequency analysis","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with conditional KO cleanly dissecting RBP-Jkappa-dependent vs independent functions","pmids":["18836481"],"is_preprint":false},{"year":2009,"finding":"Constitutively active Notch4 in adult mouse endothelium causes lung AV shunts and lung hemorrhages. Cessation of Notch4* expression reverses these effects. Whole lung organ culture confirmed the lung vascular effects are a primary lung phenomenon.","method":"Tetracycline-repressible transgenic system (endothelial-specific), vascular casting, fluorescent microsphere analysis, organ culture","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible/reversible in vivo model plus ex vivo organ culture confirmation","pmids":["19933399"],"is_preprint":false},{"year":2010,"finding":"Notch4 signaling activity is 8-fold higher in breast cancer stem cell-enriched populations compared with differentiated cells. Pharmacologic or genetic inhibition of Notch4 reduces stem cell activity in vitro and reduces/abolishes tumor formation in vivo. Notch4 inhibition produces more robust suppression of tumor initiation than Notch1 inhibition.","method":"Stem cell enrichment by anoikis resistance or ESA+/CD44+/CD24low selection, in vitro stem cell activity assays, in vivo tumor formation assays, gamma-secretase inhibitor and siRNA knockdown","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss of function with defined stem cell and tumor formation readouts; single lab","pmids":["20068161"],"is_preprint":false},{"year":2010,"finding":"Notch4 is specifically required for expression of the embryonic morphogen Nodal in aggressive melanoma cells via an RBPJ-dependent Nodal enhancer element. Notch4 regulates vasculogenic mimicry and anchorage-independent growth, effects mediated in part through Notch4 regulation of Nodal, placing Notch4 upstream of Nodal in this pathway.","method":"RBPJ-dependent Nodal enhancer luciferase reporter assay, siRNA knockdown of Notch4, vasculogenic mimicry and soft agar assays in aggressive melanoma cells","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay and siRNA knockdown identifying RBPJ-dependent Nodal regulation; single lab","pmids":["21159651"],"is_preprint":false},{"year":2012,"finding":"Normalization of Notch signaling by repressing Notch4* expression converts large-caliber high-flow AV shunts to capillary-like vessels. This regression is initiated by vessel narrowing without loss of endothelial cells and requires restoration of EphB4 receptor expression by venous endothelial cells.","method":"4D two-photon imaging through cranial window, doxycycline-mediated Notch4* repression, EphB4 expression analysis","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — live in vivo imaging of reversal with identification of EphB4 as required downstream mediator","pmids":["22261032"],"is_preprint":false},{"year":2013,"finding":"PKCα selectively increases Notch-4 (but not Notch-1) expression through activator protein-1 (AP-1) occupancy of the Notch-4 promoter. Notch-4 knockdown inhibits estrogen-independent growth of PKCα-overexpressing cells, while Notch-4IC expression stimulates it.","method":"ChIP for AP-1 at Notch-4 promoter, siRNA knockdown, Notch-4IC overexpression, estrogen-independent growth assays","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-confirmed mechanism with functional validation; single lab","pmids":["23917222"],"is_preprint":false},{"year":2013,"finding":"YB-1 binding to the Notch4 promoter (12-fold enrichment by ChIP-on-ChIP) regulates Notch4 transcription. Silencing YB-1 decreases Notch4 mRNA; constitutively active YB-1 increases it. The RSK kinase phosphorylates YB-1 to activate this axis. Luteolin inhibits RSK, suppresses YB-1 phosphorylation, and thereby reduces Notch4 expression and N4ICD levels.","method":"ChIP-on-ChIP, siRNA knockdown of YB-1, YB-1 overexpression, in vitro kinase assay for RSK, luteolin treatment with RSK/YB-1/Notch4 correlation","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-on-ChIP with functional validation by siRNA and OE; single lab","pmids":["23593654"],"is_preprint":false},{"year":2014,"finding":"NOTCH4 did not signal in response to ligand in cultured cells. Moreover, NOTCH4 inhibited signaling from NOTCH1 receptor in cis (first report of cis-inhibition by another Notch receptor). The NOTCH4 extracellular domain alone, expressed in cis, also inhibits NOTCH1 signaling. Notch4 null mice (entire coding region deleted) exhibit slightly delayed vessel growth in the retina.","method":"Cell-based signaling assays in cultured cells, NOTCH4 extracellular domain expression constructs, Notch4 null mouse generation (complete coding region deletion), retinal vascular analysis","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 / Moderate — novel cis-inhibition mechanism demonstrated with multiple constructs and null mouse; single rigorous study with orthogonal approaches","pmids":["24667410"],"is_preprint":false},{"year":2014,"finding":"Brain AVMs arise from enlargement of preexisting microvessels with capillary diameter driven by increased individual endothelial cell area (not increased EC number/proliferation). AV shunting begins promptly after Notch4* expression. Altering Notch signaling in ECs of all vessels (but not arteries alone) affects AVM formation, suggesting Notch4 functions in the microvasculature/veins. A positive feedback loop of increasing blood flow and vessel diameter drives focal AVM growth.","method":"Time-lapse two-photon imaging through cranial windows, conditional endothelial Notch4* expression, hemodynamic measurements","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — live in vivo imaging defining cellular mechanism with hemodynamic analysis; replicated across multiple papers","pmids":["25468970"],"is_preprint":false},{"year":2015,"finding":"AKT binds to Notch4-ICD and phosphorylates it at four distinct sites in vitro and in vivo. This phosphorylation is regulated by growth factors and is sensitive to PI3K inhibitors. Phosphorylation generates binding sites for 14-3-3 proteins, which restrict phosphorylated Notch4-ICD to the cytoplasm, providing a negative regulatory mechanism for Notch4 nuclear signaling.","method":"In vitro kinase assay, co-immunoprecipitation, in vivo phosphorylation assays, PI3K inhibitor treatment, 14-3-3 binding assay, subcellular localization analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus in vivo phosphorylation with multiple orthogonal methods defining mechanism; single lab","pmids":["25740432"],"is_preprint":false},{"year":2015,"finding":"JAG1-NOTCH4 receptor activation in breast cancer cells is induced by anti-estrogens (tamoxifen, fulvestrant) and drives breast cancer stem cell (BCSC) activity and anti-estrogen resistance. Targeting NOTCH4 reverses the increase in BCSC activity induced by anti-estrogens in patient-derived and PDX tumor samples.","method":"Primary patient samples and PDX models, BCSC activity assays (ALDH1, mammosphere), NOTCH4 inhibition by antibody/siRNA, in vivo tumor assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway (JAG1-NOTCH4-BCSC) validated in patient-derived and PDX models; single lab","pmids":["26387946"],"is_preprint":false},{"year":2016,"finding":"Expression of constitutively active Notch4 intracellular domain (N4ICD) in melanoma cells induces Hey1 and Hey2, which bind directly to promoter regions of Snail2 and Twist1 and repress their transcription (demonstrated by EMSA and luciferase assays), causing a mesenchymal-to-epithelial-like switch, reduced invasion and migration, and reduced tumor growth in vivo.","method":"N4ICD expression, EMSA, luciferase reporter assays for Snail2 and Twist1 promoters, Hey1/Hey2 ChIP, in vivo xenograft","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding of Hey1/Hey2 to target promoters demonstrated by EMSA and luciferase assay; functional validation in vivo","pmids":["26801977"],"is_preprint":false},{"year":2017,"finding":"NOTCH4 transcriptionally activates HEY1 in head and neck squamous cell carcinoma, and the NOTCH4-HEY1 axis drives EMT (decreased E-cadherin, increased Vimentin, Fibronectin, TWIST1, SOX2), proliferation, cisplatin resistance, and increased invasion/migration.","method":"siRNA knockdown, TCGA data analysis, in vitro proliferation/apoptosis/cell-cycle/invasion/migration assays","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with multiple functional readouts; single lab, no ChIP validation of direct transcriptional activation","pmids":["29146722"],"is_preprint":false},{"year":2017,"finding":"RUNX1 negatively controls NOTCH4 expression via a novel regulatory DNA element within the NOTCH4 locus. Specific CRISPR-Cas9-mediated inactivation of NOTCH4 in human iPSCs enhances megakaryopoiesis. Small-molecule Notch signaling inhibitors promote megakaryocyte generation from human iPSCs and postnatal CD34+ hematopoietic stem/progenitor cells.","method":"Integrative genomic analysis of FPD-iPSCs, improved CRISPR-Cas9 NOTCH4 knockout in human iPSCs, MK differentiation assays, Notch inhibitor treatment of CD34+ cells","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Moderate — CRISPR KO with defined functional readout; genomic identification of RUNX1 regulatory element; multiple approaches","pmids":["29101237"],"is_preprint":false},{"year":2018,"finding":"Notch4 intracellular domain interacts with TAK1 and inhibits its activation; Notch4 also prevents TRAF6 autoubiquitination and suppresses TRAF6-mediated TAK1 polyubiquitination, thereby inhibiting M. tuberculosis-induced proinflammatory cytokine production. Notch4-deficient mice show lower bacterial burden and reduced lung pathology after M. tuberculosis infection.","method":"Co-immunoprecipitation (Notch4-TAK1 interaction), ubiquitination assays (TRAF6 autoubiquitination, TAK1 polyubiquitination), Notch4-deficient mice, in vivo infection model","journal":"The Journal of infectious diseases","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct protein interaction by Co-IP combined with ubiquitination mechanism assays and in vivo KO validation","pmids":["29228365"],"is_preprint":false},{"year":2020,"finding":"NOTCH4 transcriptionally upregulates SLUG and GAS1 in TNBC cells; dual-luciferase reporter and ChIP assays identified genuine NOTCH4 binding sites on SLUG and GAS1 promoters. NOTCH4-SLUG upregulation promotes EMT, and NOTCH4-GAS1 upregulation promotes quiescence in mesenchymal-like breast cancer stem cells. SLUG also harnesses GAS1 via its anti-apoptotic function.","method":"Dual-luciferase reporter assay, ChIP, RNA-seq, stable OE/KD cell lines, mammosphere formation, chemoresistance assays, in vivo serial dilution","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct transcriptional targets confirmed by ChIP and luciferase reporter with multiple functional validations; single lab","pmids":["32104513"],"is_preprint":false},{"year":2020,"finding":"IL-6/STAT3-dependent upregulation of Notch4 on lung tissue regulatory T cells is necessary for allergen/pollutant-induced airway inflammation. Notch4 subverts Treg cells into TH2 and TH17 effector T cells via Wnt and Hippo pathway-dependent mechanisms. Wnt activation in Tregs induces GDF15 expression, which activates group 2 innate lymphoid cells to amplify inflammation.","method":"Conditional Notch4 deletion in Treg cells (mouse models), anti-Notch4 antibody therapy, Wnt/Hippo pathway inhibitors, human circulating Treg cell analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO plus antibody therapy with defined mechanistic pathway (Wnt/Hippo/GDF15) and human correlation","pmids":["32929274"],"is_preprint":false},{"year":2021,"finding":"Notch4 on regulatory T cells suppresses induction of amphiregulin (a tissue repair cytokine) by IL-18. Deletion of Notch4 in Treg cells or anti-Notch4 antibody therapy rescues disease morbidity and mortality in influenza and synthetic viral RNA models. Protection by Notch4 inhibition is recapitulated by amphiregulin therapy and abrogated by its antagonism.","method":"Treg-specific Notch4 deletion (conventional and humanized mice), anti-Notch4 antibody therapy, amphiregulin administration/antagonism, prospective COVID-19 patient cohort","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO and antibody therapy in multiple models with mechanistic rescue/antagonism experiments identifying amphiregulin as downstream effector","pmids":["33915108"],"is_preprint":false},{"year":2021,"finding":"Notch4 null mice have increased closure of lymphangiogenic fronts, reduced lymphatic vessel caliber at E14.5, and reduced branching at E16.5. Notch4 activation suppresses lymphatic endothelial cell migration more strongly than Notch1 activation. Loss of Notch4 does not affect canonical LEC Notch signaling, indicating Notch4 and canonical Notch signaling have distinct functions in lymphangiogenesis.","method":"Notch4 null mice, embryonic dermal lymphatic analysis, LEC migration wounding assay, comparison with DNMAML (canonical Notch blockade) Prox1-Cre mice","journal":"Angiogenesis","confidence":"High","confidence_rationale":"Tier 2 / Strong — null mice combined with epistasis experiment (DNMAML) distinguishing Notch4 from canonical Notch signaling in same tissue","pmids":["34665379"],"is_preprint":false},{"year":2022,"finding":"Disturbed blood flow activates the JAG1-NOTCH4 signaling pathway in endothelial cells. EC-specific deletion of Jag1 (Jag1) in mice demonstrates JAG1 promotes atherosclerosis at sites of disturbed flow. Single-cell RNA sequencing showed Jag1 suppresses subsets of ECs that proliferate and migrate.","method":"Porcine and murine artery exposure to disturbed flow, cultured human coronary artery ECs, light-sheet imaging, EC-specific Jag1 conditional KO mice, single-cell RNA sequencing","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro mechanosensing assay, in vivo conditional KO with single-cell RNA-seq; multiple organisms and orthogonal approaches","pmids":["36044575"],"is_preprint":false},{"year":2022,"finding":"Notch4 interacts with ERK, JNK, and P38 MAPK (confirmed by co-immunoprecipitation) and promotes HPASMC proliferation and migration while inhibiting apoptosis via these signaling pathways. AAV1-mediated Notch4 silencing in vivo reduces right ventricular systolic pressure and pulmonary vascular remodeling in hypoxic rats.","method":"Co-immunoprecipitation (Notch4-ERK/JNK/P38), siRNA knockdown and overexpression in HPASMCs, cell viability/proliferation/apoptosis/migration assays, AAV1-si-Notch4 in vivo","journal":"Respiratory research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of Notch4-MAPK interaction with functional validation in vitro and in vivo; single lab","pmids":["35016680"],"is_preprint":false},{"year":2022,"finding":"IL-4Rα R576 variant upregulates Notch4 expression on lung Treg cells in an IL-6- and GRB2-dependent manner. Signaling via IL-4RαR576 upregulates Notch4 and its downstream mediators Yap1 and beta-catenin in lung Tregs, leading to exacerbated lung inflammation. Treg-specific Notch4 deletion or anti-Notch4 antibody inhibits this augmented inflammation.","method":"Il4raR576 knock-in mouse model, Treg-specific Notch4 deletion, GRB2 and IL-6R inhibition, Yap1/beta-catenin expression analysis, human PBMC analysis","journal":"Allergy","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic mouse models with conditional KO, multiple pathway inhibitors, and human correlation identifying GRB2-IL-6-Notch4 circuit","pmids":["35841382"],"is_preprint":false},{"year":2021,"finding":"Constitutively active Notch4 intracellular domain promotes proliferation of 3T3-L1 preadipocytes through the ERK pathway and cell cycle modulation, and facilitates differentiation by upregulating adipogenic genes (C/EBPα, PPARγ, aP2, LPL, HSL) and repressing the inhibitor Pref-1. HES1, Hey1, C/EBPδ, and PPARγ are upregulated downstream of N4IC.","method":"Transient and stable transfection of N4IC in 3T3-L1 cells, qRT-PCR, western blot, proliferation and differentiation assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — gain-of-function with defined gene expression readouts; single lab, single method set","pmids":["23237809"],"is_preprint":false},{"year":2011,"finding":"PEA3 (ETS transcription factor) directly activates Notch-4 transcription in MDA-MB-231 breast cancer cells; ChIP confirmed enrichment of PEA3 on the Notch-4 promoter. PEA3 recruitment to the Notch-4 promoter is c-JUN (AP-1)-dependent, while its recruitment to Notch-1 is AP-1-independent. A Notch-4 luciferase reporter confirmed PEA3/AP-1 activation.","method":"ChIP, siRNA knockdown, Notch-4 luciferase reporter assay, TAM-67 and c-Jun siRNA, real-time PCR","journal":"Breast cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirmed PEA3 occupancy with luciferase reporter and AP-1 dependence; single lab","pmids":["21679465"],"is_preprint":false},{"year":2019,"finding":"VEGF165 inhibits pro-fibrotic differentiation of endometrial stromal cells via the DLL4/Notch4/Smad7 pathway; inhibition of Smad7 or Notch4 expression, or blockade of Notch signaling, abrogates this beneficial VEGF165 effect, indicating Smad7 and Notch4 are essential downstream effectors.","method":"siRNA knockdown of Notch4/Smad7, Notch signaling inhibitor, TGFβ1-induced fibrotic model in primary human endometrial stromal cells, conditional VEGF knockout mice","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway ordering by siRNA and pharmacological inhibition with defined fibrosis phenotype; single lab","pmids":["31515487"],"is_preprint":false},{"year":2021,"finding":"Hypoxia activates Delta-like 4 and Notch4 in lung adenocarcinoma (LUAD) cells; Notch4 physically interacts with ERK, JNK, and P38 (confirmed by Co-IP) and their activation is required for Notch4's pro-proliferative, anti-apoptotic, and pro-migratory effects, which are reversed by pathway inhibitors.","method":"Co-immunoprecipitation (Notch4-ERK/JNK/P38), siRNA/OE, MAPK inhibitors, in vitro proliferation/apoptosis/migration, in vivo xenograft models","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP confirmed interaction with pharmacological rescue; single lab","pmids":["34988077"],"is_preprint":false},{"year":2021,"finding":"NOTCH4 exhibits anti-inflammatory activity in macrophages by (1) interfering with STAT1-dependent transcription downstream of IFN-γ, favoring STAT3 over STAT1 phosphorylation without affecting their expression; (2) inhibiting NF-κB transcriptional activity via diminished STAT1 activation downstream of TLR/LPS. HES1 mediates, at least in part, the enhancement of STAT3 activation by NOTCH4.","method":"NOTCH4 overexpression/knockdown in macrophages, STAT1/STAT3 phosphorylation western blot, NF-κB luciferase reporter, IRF1/SOCS1/CXCL10 expression analysis, Hes1 reporter","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple signaling pathway readouts with OE/KD; single lab, no structural or in vitro reconstitution","pmids":["34925319"],"is_preprint":false},{"year":2019,"finding":"Notch4 activation promotes HIV-associated nephropathy (HIVAN) disease progression; global deletion of the Notch4 intracellular domain in Tg26 mice (Notch4 ICD KO) significantly improved renal function, decreased mortality, reduced glomerular and tubulointerstitial injury, decreased interstitial inflammation, and reduced expression of IL-6, CCL2, and NF-κB (Nfkb1/p65).","method":"Notch4 ICD global deletion in Tg26 HIVAN mice, renal function assays, histology, cytokine qRT-PCR, NF-κB protein analysis","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ICD knockout with defined functional and molecular phenotypes; single lab","pmids":["31727625"],"is_preprint":false},{"year":1999,"finding":"Retroviral splicing events between an intracisternal type A particle (IAP) and Notch4/int3 sequences generate two fusion transcripts encoding different portions of the intracellular domain (one with RAM domain, one without). These two proteins show different subcellular localizations in mammary epithelial cells (HC-11): both cytoplasm+nucleus vs. nucleus only.","method":"Sequence analysis of mammary tumor, immunofluorescence of transfected cells, subcellular localization analysis","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single-tumor analysis with cell-based localization; mechanistically informative regarding RAM domain and nuclear localization","pmids":["10233982"],"is_preprint":false},{"year":2004,"finding":"A truncated Notch4/Int3 protein lacking the CBF1-binding region (RAM23) localizes to both cytoplasm and nucleus (vs. nucleus-only for full Int3-ICD), and mammary tumors arising from its expression show activation of the Notch target Hes-1, but with longer latency, suggesting a gradient of CBF1-dependent Notch4 signaling determines the extent of oncogenicity.","method":"Immunofluorescence of transfected COS-1 cells, transgenic mouse mammary tumor model, RT-PCR/western blot for Hes-1","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct localization experiment with functional in vivo consequence; single lab","pmids":["15531924"],"is_preprint":false},{"year":2008,"finding":"HIV protease inhibitor Nelfinavir (but not Saquinavir, Indinavir, or Ritonavir) specifically increases Notch4 processing and Notch4 intracellular domain nuclear localization, leading to induction of NFκB and MMP2 expression in cerebral endothelial cells. Pre-treatment with Vitamin E partially prevents Nelfinavir-induced changes in Notch4 processing and localization.","method":"Western blot for Notch4 processing, nuclear localization analysis, NFκB/MMP2 expression assay, antioxidant rescue experiment in cerebral endothelial cells","journal":"BMC neuroscience","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacological experiment with localization readout; single lab, mechanistic link to reactive oxygen species only partial","pmids":["18302767"],"is_preprint":false}],"current_model":"NOTCH4 is an endothelial cell-enriched transmembrane receptor that, upon ligand (e.g., JAG1, DLL4) binding, releases its intracellular domain (N4ICD) for nuclear translocation; N4ICD signals via RBP-Jkappa (ankyrin repeat-dependent) to inhibit endothelial sprouting and promote survival, and via RBP-Jkappa-independent mechanisms (Bcl-2 upregulation, beta1-integrin activation, TAK1/TRAF6 suppression) to regulate apoptosis, inflammation, and vascular remodeling; constitutively active NOTCH4 drives arteriovenous malformations and atherosclerosis in vivo by enlarging capillary-like vessels and inducing arterial characteristics, while in immune cells (Treg cells) NOTCH4 suppresses amphiregulin-dependent tissue repair and GDF15-mediated tolerance, and in cancer stem cells NOTCH4 maintains stemness through transcriptional activation of SLUG, GAS1, and Nodal; nuclear localization of N4ICD is negatively regulated by AKT-mediated phosphorylation generating 14-3-3 binding sites, and NOTCH4 transcription itself is controlled by AP-1, GR, PEA3/c-Jun, YB-1/RSK, and RUNX1 regulatory inputs."},"narrative":{"mechanistic_narrative":"NOTCH4 is an endothelial-enriched transmembrane Notch receptor whose intracellular domain (N4ICD) couples cell-surface ligand sensing to transcriptional and signaling programs that govern vascular remodeling, cell survival, and inflammation [PMID:8681805, PMID:9693032]. Structurally it comprises 29 EGF-like repeats, LIN-12/Notch repeats, a transmembrane region, cdc10/ankyrin repeats, and a PEST domain; the int-3 oncogene encodes only the intracellular domain, and loss of the extracellular and LIN-12 regulatory regions renders the receptor constitutively active [PMID:8681805, PMID:9150355, PMID:9693032]. Activated NOTCH4 signals partly through RBP-Jkappa (CBF-1) via its ankyrin repeats and partly through RBP-Jkappa-independent routes: the ankyrin repeats alone drive RBP-Jkappa-dependent transcription and partial inhibition of endothelial sprouting, while a constitutively active RBP-Jkappa recapitulates this only weakly, defining parallel dependent and independent outputs [PMID:14701863, PMID:15187023, PMID:18836481]. In the vasculature, constitutively active NOTCH4 inhibits VEGF-induced endothelial sprouting and angiogenesis—in part by switching beta1-integrin to a high-affinity conformation that increases collagen adhesion—and promotes endothelial survival via RBP-Jkappa-dependent JNK suppression and RBP-Jkappa-independent Bcl-2 upregulation [PMID:11909975, PMID:14701863, PMID:18802018]. In vivo, endothelial expression of activated NOTCH4 produces arteriovenous malformations through enlargement of capillary-caliber microvessels driven by increased individual endothelial-cell area, with arterialization marked by ephrinB2 induction; these lesions reverse upon transgene repression and require restoration of venous EphB4 expression, and the receptor acts downstream of VEGF/DLL4 to direct arterial differentiation [PMID:15994223, PMID:16951162, PMID:22261032, PMID:25468970]. NOTCH4 nuclear signaling is negatively gated by AKT, which phosphorylates N4ICD at four sites to generate 14-3-3 binding sites that retain it in the cytoplasm [PMID:25740432]. Beyond canonical activation, NOTCH4 cis-inhibits NOTCH1 signaling, and its own transcription is controlled by AP-1, glucocorticoid receptor, PEA3/c-Jun, YB-1/RSK, and RUNX1 inputs in a cell-type-specific manner [PMID:15684396, PMID:17220278, PMID:24667410, PMID:23593654, PMID:21679465, PMID:29101237]. In cancer, NOTCH4 maintains breast cancer stem-cell activity and anti-estrogen resistance and directly transactivates SLUG, GAS1, HEY1, and Nodal to control EMT, quiescence, and tumorigenesis [PMID:20068161, PMID:26387946, PMID:32104513, PMID:21159651, PMID:26801977]. In immune cells, NOTCH4 on regulatory T cells suppresses amphiregulin-dependent tissue repair and subverts Tregs toward TH2/TH17 effector fates via Wnt/Hippo and GDF15 mechanisms, while in macrophages it acts anti-inflammatory by favoring STAT3 over STAT1 and suppressing NF-kappaB, and it dampens TLR/TAK1 signaling by binding TAK1 and blocking TRAF6 ubiquitination [PMID:32929274, PMID:33915108, PMID:34925319, PMID:29228365].","teleology":[{"year":1996,"claim":"Established NOTCH4 as an endothelial-restricted transmembrane Notch receptor and identified the int-3 oncogene as its constitutively active, extracellular-domain-less intracellular fragment, framing the receptor's activation logic.","evidence":"cDNA cloning, sequence analysis, and in situ hybridization; sequence analysis of nine MMTV-induced tumors","pmids":["8681805","9150355"],"confidence":"High","gaps":["Did not define the physiological ligand or the proteolytic activation steps for full-length receptor","Endothelial restriction left the breast-tumor context mechanistically unexplained"]},{"year":1998,"claim":"Resolved the full domain architecture and promoter features of human NOTCH4 and showed that the CBF-1/RBP-Jkappa interaction domain plus the ankyrin repeats constitute the minimal effector module for biological output.","evidence":"Genomic sequencing and isoform characterization; deletion-mutant branching morphogenesis assays in mammary epithelial cells","pmids":["9693032","9576833"],"confidence":"High","gaps":["Did not separate RBP-Jkappa-dependent from -independent contributions","Ligand-driven activation not addressed"]},{"year":2001,"claim":"Demonstrated in vivo that activated NOTCH4 in embryonic endothelium disrupts vessel patterning and remodeling, establishing a developmental vascular role beyond cell culture.","evidence":"Flk1-driven activated Notch4 transgenic mouse with vascular phenotyping","pmids":["11344305"],"confidence":"High","gaps":["Embryonic lethality precluded adult analysis","Downstream effectors of vessel dilation undefined"]},{"year":2003,"claim":"Dissected NOTCH4 survival signaling into RBP-Jkappa-dependent JNK suppression and RBP-Jkappa-independent Bcl-2 upregulation, defining parallel anti-apoptotic outputs.","evidence":"Apoptosis assays, RBP-Jkappa reporters, RAM-domain deletion, and Bcl-2 western blot in endothelial cells","pmids":["14701863"],"confidence":"High","gaps":["Molecular route to Bcl-2 induction not mapped","Relevance to in vivo vascular phenotypes not tested here"]},{"year":2002,"claim":"Identified beta1-integrin conformational activation as a non-transcriptional mechanism by which NOTCH4 inhibits endothelial sprouting, mechanistically linking the receptor to angiogenesis control.","evidence":"In vitro sprouting and chick CAM assays, integrin-conformation flow cytometry, function-activating antibodies","pmids":["11909975"],"confidence":"High","gaps":["How N4ICD activates integrin conformation biochemically is unresolved","Did not connect integrin activation to the in vivo AVM phenotype"]},{"year":2004,"claim":"Mapped the ankyrin repeats as necessary and sufficient for RBP-Jkappa-dependent gene activation and partial sprouting inhibition, while showing a constitutively active RBP-Jkappa underperforms full N4ICD—formally establishing RBP-Jkappa-independent signaling.","evidence":"Endothelial sprouting assays with N4IC deletion mutants and RBP-Jkappa reporters; hematopoietic progenitor transduction assays","pmids":["15187023","15231576","14961038"],"confidence":"High","gaps":["Identity of RBP-Jkappa-independent partners not determined","VEGFR-2/VE-cadherin downregulation insufficient to explain phenotype"]},{"year":2005,"claim":"Showed NOTCH4 cross-talks with TGF-beta by binding Smad2/3/4 to attenuate TGF-beta signaling, and that endothelial AP-1 complexes occupy NOTCH4 chromatin to drive its tissue-specific transcription.","evidence":"Co-IP/binding and deletion analysis with reporters and gamma-secretase inhibition; ChIP, RNA FISH, and transgenic reporters","pmids":["16007227","15684396"],"confidence":"High","gaps":["Physiological setting of Smad antagonism within endothelium not established","Upstream signals controlling AP-1 occupancy only partially defined"]},{"year":2005,"claim":"Established that adult endothelial activation of NOTCH4 causes reversible AV malformations with arterialization, providing a tractable disease model and linking the receptor to ephrinB2-driven arterial identity.","evidence":"Tetracycline-repressible endothelial transgenic mice with ephrinB2 immunostaining and doxycycline rescue","pmids":["15994223"],"confidence":"High","gaps":["Did not yet resolve whether vessel enlargement reflects cell-size versus cell-number changes","Downstream effector required for reversal unidentified"]},{"year":2006,"claim":"Placed NOTCH4 downstream of VEGF/DLL4 in a cascade that upregulates ephrinB2 and downregulates EphB4 to specify arterial endothelial fate.","evidence":"HUVEC treatment with pharmacological inhibition (presenilin, soluble DLL4) and in vivo hepatocarcinoma model","pmids":["16951162"],"confidence":"Medium","gaps":["Pharmacological inhibitors are not NOTCH4-specific","Direct transcriptional control of ephrinB2 by N4ICD not shown"]},{"year":2007,"claim":"Defined a composite AP-1/glucocorticoid-receptor response element through which FGF-2 and cortisol cooperatively reprogram the NOTCH4 locus, extending transcriptional control to hormonal and growth-factor inputs.","evidence":"ChIP, luciferase reporters, and histone-modification analysis in endothelial and 10T1/2 cells","pmids":["17220278"],"confidence":"High","gaps":["Physiological contexts where GR and AP-1 converge on NOTCH4 not delineated","In vivo requirement of the composite element untested"]},{"year":2008,"claim":"Showed brain AVMs from activated NOTCH4 arise from enlarged microvasculature with reduced capillary density, mechanistically tying the disease to NOTCH4's inhibition of sprouting, and that basal NOTCH4 maintains EC quiescence and survival.","evidence":"Inducible/reversible endothelial transgenic mice with disease reversal; endothelial siRNA knockdown with VCAM-1, apoptosis, and injury-repair assays","pmids":["18667694","18802018"],"confidence":"High","gaps":["Cellular basis of vessel enlargement not yet imaged at single-cell resolution","TNFalpha-PI3K suppression of NOTCH4 mechanism only outlined"]},{"year":2008,"claim":"Genetically separated NOTCH4 oncogenic functions, demonstrating RBP-Jkappa-dependent developmental arrest but RBP-Jkappa-independent mammary tumorigenesis.","evidence":"Conditional Rbpj knockout in Wap-Int3 transgenic mice with histology and tumor frequency","pmids":["18836481"],"confidence":"High","gaps":["The RBP-Jkappa-independent oncogenic effector remained unidentified","Did not address whether vascular phenotypes share this independence"]},{"year":2009,"claim":"Extended the reversible AVM model to adult lung, confirming organ-intrinsic NOTCH4-driven AV shunting.","evidence":"Tetracycline-repressible endothelial transgenic mice, vascular casting, and whole-lung organ culture","pmids":["19933399"],"confidence":"High","gaps":["Tissue-specific modifiers of lung versus brain AVM not defined","Downstream signaling not dissected in this study"]},{"year":2010,"claim":"Identified NOTCH4 as a dominant driver of cancer stem-cell activity and, in melanoma, an RBP-Jkappa-dependent activator of the embryonic morphogen Nodal, linking the receptor to tumor initiation and plasticity.","evidence":"Stem-cell enrichment and tumor-formation assays with gamma-secretase inhibition and siRNA; RBPJ-dependent Nodal enhancer reporter and vasculogenic-mimicry assays","pmids":["20068161","21159651"],"confidence":"Medium","gaps":["Direct NOTCH4 promoter occupancy on stemness targets not shown here","Single-lab observations awaiting orthogonal confirmation"]},{"year":2011,"claim":"Showed PEA3 directly activates NOTCH4 transcription in a c-Jun/AP-1-dependent manner distinct from its NOTCH1 regulation, refining the transcriptional logic that distinguishes the two receptors.","evidence":"ChIP, siRNA, NOTCH4 luciferase reporter with TAM-67 and c-Jun knockdown in breast cancer cells","pmids":["21679465"],"confidence":"Medium","gaps":["Functional consequence of PEA3-driven NOTCH4 not tested in vivo","Single-lab finding"]},{"year":2012,"claim":"Demonstrated by live imaging that AV-shunt regression upon NOTCH4 normalization proceeds via vessel narrowing without EC loss and requires restored venous EphB4 expression, identifying EphB4 as the key downstream mediator of reversal.","evidence":"4D two-photon cranial-window imaging with doxycycline-mediated transgene repression and EphB4 analysis","pmids":["22261032"],"confidence":"High","gaps":["How NOTCH4 represses EphB4 mechanistically not resolved","Translatability of reversal to human AVM untested"]},{"year":2013,"claim":"Expanded NOTCH4 transcriptional regulation to PKCalpha/AP-1 and a YB-1/RSK axis, connecting kinase signaling to NOTCH4 expression and estrogen-independent growth.","evidence":"ChIP, siRNA/overexpression, in vitro RSK kinase assays, and luteolin treatment in breast cancer cells; N4IC adipocyte differentiation assays","pmids":["23917222","23593654","23237809"],"confidence":"Medium","gaps":["In vivo relevance of YB-1/RSK and PKCalpha control not established","Adipocyte role rests on a single gain-of-function dataset"]},{"year":2014,"claim":"Revealed that NOTCH4 fails to signal in response to ligand in culture and instead cis-inhibits NOTCH1, while germline Notch4-null mice show only mild retinal vascular delay—reframing NOTCH4 as an atypical, partly inhibitory Notch receptor.","evidence":"Cell-based signaling assays, extracellular-domain constructs, and complete-coding-region Notch4-null mice with retinal analysis","pmids":["24667410"],"confidence":"High","gaps":["Mild null phenotype contrasts with strong gain-of-function effects, leaving physiological role uncertain","Structural basis of cis-inhibition undefined"]},{"year":2015,"claim":"Identified AKT-mediated phosphorylation of N4ICD at four sites generating 14-3-3 binding sites that retain it in the cytoplasm, defining a growth-factor/PI3K-controlled brake on NOTCH4 nuclear signaling, and connected JAG1-NOTCH4 to anti-estrogen-induced breast cancer stem-cell resistance.","evidence":"In vitro/in vivo kinase and phosphorylation assays, 14-3-3 binding, localization analysis; PDX and patient-sample BCSC assays with NOTCH4 inhibition","pmids":["25740432","26387946"],"confidence":"High","gaps":["Whether AKT-14-3-3 gating operates in endothelial AVM remains untested","Phosphosite mutants not validated in vivo"]},{"year":2016,"claim":"Showed N4ICD induces Hey1/Hey2 that directly repress Snail2 and Twist1 promoters to drive a mesenchymal-to-epithelial switch in melanoma, demonstrating context-dependent, anti-invasive transcriptional output.","evidence":"N4ICD expression, EMSA, Hey1/Hey2 ChIP and promoter reporters, and xenografts","pmids":["26801977"],"confidence":"High","gaps":["Apparent opposite EMT effects across cancer types not reconciled","Determinants of Hey1/2 target selection unknown"]},{"year":2017,"claim":"Established the NOTCH4-HEY1 axis as a driver of EMT and cisplatin resistance in head and neck cancer and identified RUNX1 as a negative transcriptional regulator of NOTCH4 whose loss enhances megakaryopoiesis.","evidence":"siRNA and TCGA analysis with functional assays; integrative genomics and CRISPR-Cas9 NOTCH4 knockout in iPSCs with MK differentiation","pmids":["29146722","29101237"],"confidence":"High","gaps":["Direct NOTCH4 binding to HEY1 promoter not demonstrated in the HNSCC study","RUNX1 regulatory element function not tested in vivo"]},{"year":2018,"claim":"Defined a non-canonical anti-inflammatory mechanism whereby N4ICD binds TAK1 and blocks TRAF6 autoubiquitination to suppress proinflammatory cytokine production, with Notch4-deficient mice resisting M. tuberculosis.","evidence":"Co-IP, ubiquitination assays, and Notch4-deficient mouse infection model","pmids":["29228365"],"confidence":"High","gaps":["Whether this requires nuclear N4ICD or cytoplasmic pools is unclear","Generalizability beyond mycobacterial infection not shown"]},{"year":2019,"claim":"Implicated NOTCH4 as a downstream effector in profibrotic and renal-injury contexts, with N4ICD deletion improving HIV-associated nephropathy and reducing NF-kappaB/IL-6/CCL2.","evidence":"siRNA/pathway inhibition in endometrial stromal fibrosis; Notch4 ICD global knockout in Tg26 HIVAN mice with cytokine and histology analysis","pmids":["31515487","31727625"],"confidence":"Medium","gaps":["Direct molecular targets of NOTCH4 in these tissues undefined","Single-lab in vivo observations"]},{"year":2020,"claim":"Identified SLUG and GAS1 as direct NOTCH4 transcriptional targets controlling EMT and stem-cell quiescence in TNBC, and established a Treg-intrinsic NOTCH4 program that subverts regulatory T cells into TH2/TH17 effectors via Wnt/Hippo and GDF15.","evidence":"ChIP and dual-luciferase reporters with stable OE/KD and in vivo serial dilution; conditional Treg Notch4 deletion, anti-Notch4 antibody, and Wnt/Hippo inhibitors with human Treg analysis","pmids":["32104513","32929274"],"confidence":"High","gaps":["Upstream ligand and activation step driving Treg NOTCH4 signaling not fully defined here","Whether SLUG/GAS1 control generalizes beyond TNBC untested"]},{"year":2021,"claim":"Showed NOTCH4 on Tregs suppresses IL-18-induced amphiregulin to impair tissue repair in viral injury, and that NOTCH4 has distinct, non-canonical roles in lymphangiogenesis and macrophage inflammation, broadening its immune and vascular repertoire.","evidence":"Treg-specific Notch4 deletion and antibody therapy with amphiregulin rescue and a COVID-19 cohort; Notch4-null lymphatic analysis with DNMAML epistasis; macrophage STAT1/STAT3 and NF-kappaB assays; MAPK Co-IP in lung adenocarcinoma","pmids":["33915108","34665379","34925319","34988077"],"confidence":"High","gaps":["How NOTCH4 mechanistically biases STAT3 over STAT1 beyond HES1 is incomplete","Reconciliation of pro- and anti-inflammatory roles across cell types unresolved"]},{"year":2022,"claim":"Connected JAG1-NOTCH4 to flow-mechanosensing in atherosclerosis and to MAPK-dependent pulmonary vascular remodeling, and tied an IL-4Ralpha variant to GRB2/IL-6-driven NOTCH4 induction on Tregs that exacerbates lung inflammation.","evidence":"Disturbed-flow models with EC-specific Jag1 knockout and scRNA-seq; Notch4-MAPK Co-IP with AAV1 silencing in hypoxic rats; Il4raR576 knock-in with Treg Notch4 deletion and human PBMC analysis","pmids":["36044575","35016680","35841382"],"confidence":"High","gaps":["Direct transcriptional targets downstream of flow-activated NOTCH4 not defined","MAPK interaction studies remain single-lab Co-IP-based"]},{"year":null,"claim":"It remains unresolved how NOTCH4's atypical, largely ligand-unresponsive and cis-inhibitory behavior reconciles with the strong, RBP-Jkappa-dependent and -independent outputs of its constitutively active intracellular domain across endothelium, immune cells, and cancer.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of NOTCH4 or its cis-inhibitory interface with NOTCH1","The physiological ligand-dependent signaling state versus gain-of-function biology is not unified","The full set of RBP-Jkappa-independent effectors mediating tumorigenesis and inflammation is incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,7,26]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[8,9,30,34,22]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[26,12,33]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[28,47,48]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[28,47,48]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,9,28,33]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,14,27,37]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[33,35,36,45]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[13,16,30,34]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[14,17,38,46]}],"complexes":[],"partners":["RBPJ","JAG1","DLL4","NOTCH1","SMAD3","AKT1","TAK1","TRAF6"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q99466","full_name":"Neurogenic locus notch homolog protein 4","aliases":[],"length_aa":2003,"mass_kda":209.6,"function":"Functions as a receptor for membrane-bound ligands Jagged1, Jagged2 and Delta1 to regulate cell-fate determination. Upon ligand activation through the released notch intracellular domain (NICD) it forms a transcriptional activator complex with RBPJ/RBPSUH and activates genes of the enhancer of split locus. Affects the implementation of differentiation, proliferation and apoptotic programs. May regulate branching morphogenesis in the developing vascular system (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q99466/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NOTCH4","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NOTCH4","total_profiled":1310},"omim":[{"mim_id":"621120","title":"DELTA-LIKE NONCANONICAL NOTCH LIGAND 2; DLK2","url":"https://www.omim.org/entry/621120"},{"mim_id":"608991","title":"MASTERMIND-LIKE 3; MAML3","url":"https://www.omim.org/entry/608991"},{"mim_id":"608582","title":"EPIDERMAL GROWTH FACTOR-LIKE 7; EGFL7","url":"https://www.omim.org/entry/608582"},{"mim_id":"607537","title":"MASTERMIND-LIKE 2; MAML2","url":"https://www.omim.org/entry/607537"},{"mim_id":"607536","title":"CREB-REGULATED TRANSCRIPTION COACTIVATOR 1; CRTC1","url":"https://www.omim.org/entry/607536"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose 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Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/16894623","citation_count":20,"is_preprint":false},{"pmid":"15653273","id":"PMC_15653273","title":"Five NOTCH4 polymorphisms show weak evidence for association with schizophrenia: evidence from meta-analyses.","date":"2005","source":"Schizophrenia research","url":"https://pubmed.ncbi.nlm.nih.gov/15653273","citation_count":20,"is_preprint":false},{"pmid":"17220278","id":"PMC_17220278","title":"Glucocorticoid and growth factor synergism requirement for Notch4 chromatin domain activation.","date":"2007","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17220278","citation_count":20,"is_preprint":false},{"pmid":"12873802","id":"PMC_12873802","title":"Family-based association study of the NOTCH4 gene in schizophrenia using Japanese and Chinese samples.","date":"2003","source":"Biological psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/12873802","citation_count":20,"is_preprint":false},{"pmid":"18302767","id":"PMC_18302767","title":"Alterations in the Notch4 pathway in cerebral endothelial cells by the HIV aspartyl protease inhibitor, nelfinavir.","date":"2008","source":"BMC neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/18302767","citation_count":20,"is_preprint":false},{"pmid":"27197026","id":"PMC_27197026","title":"Association of Notch4 with metastasis in human oral squamous cell carcinoma.","date":"2016","source":"Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/27197026","citation_count":18,"is_preprint":false},{"pmid":"29693251","id":"PMC_29693251","title":"NOTCH4 regulates colorectal cancer proliferation, invasiveness, and determines clinical outcome of patients.","date":"2018","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/29693251","citation_count":18,"is_preprint":false},{"pmid":"10233982","id":"PMC_10233982","title":"Intracisternal type A particle-mediated activation of the Notch4/int3 gene in a mouse mammary tumor: generation of truncated Notch4/int3 mRNAs by retroviral splicing events.","date":"1999","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/10233982","citation_count":18,"is_preprint":false},{"pmid":"34988077","id":"PMC_34988077","title":"Hypoxia Activates Notch4 via ERK/JNK/P38 MAPK Signaling Pathways to Promote Lung Adenocarcinoma Progression and Metastasis.","date":"2021","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/34988077","citation_count":18,"is_preprint":false},{"pmid":"31727625","id":"PMC_31727625","title":"Notch4 activation aggravates NF-κB-mediated inflammation in HIV-1-associated nephropathy.","date":"2019","source":"Disease models & mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/31727625","citation_count":17,"is_preprint":false},{"pmid":"19852756","id":"PMC_19852756","title":"Peroxisome-proliferator-activated receptor-binding protein (PBP) is essential for the growth of active Notch4-immortalized mammary epithelial cells by activating SOX10 expression.","date":"2009","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/19852756","citation_count":16,"is_preprint":false},{"pmid":"22732452","id":"PMC_22732452","title":"Investigation of NOTCH4 coding region polymorphisms in sporadic inclusion body myositis.","date":"2012","source":"Journal of neuroimmunology","url":"https://pubmed.ncbi.nlm.nih.gov/22732452","citation_count":16,"is_preprint":false},{"pmid":"32900838","id":"PMC_32900838","title":"Convergent lines of evidence support NOTCH4 as a schizophrenia risk gene.","date":"2020","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32900838","citation_count":15,"is_preprint":false},{"pmid":"37149651","id":"PMC_37149651","title":"Silencing Notch4 promotes tumorigenesis and inhibits metastasis of triple-negative breast cancer via Nanog and Cdc42.","date":"2023","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/37149651","citation_count":15,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50967,"output_tokens":12980,"usd":0.1738,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":24579,"output_tokens":8734,"usd":0.170623,"stage2_stop_reason":"end_turn"},"total_usd":0.344423,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"Notch4 is a transmembrane receptor with EGF-like repeats and intracellular domain; the int-3 oncogene encodes only the intracellular domain of Notch4, and loss of the extracellular domain leads to constitutive activation. Notch4 transcripts are primarily restricted to endothelial cells in embryonic and adult life.\",\n      \"method\": \"cDNA cloning, deduced amino acid sequence analysis, in situ hybridization\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — foundational structural characterization with in situ hybridization for localization, replicated across multiple subsequent studies\",\n      \"pmids\": [\"8681805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"NOTCH4 (INT3) protein contains 29 EGF-like repeats (instead of 36 in other Notch homologs); all MMTV-induced tumorigenic INT3 mutations result from proviral insertions that cause expression of only the intracellular domain, demonstrating that constitutive activation occurs in the absence of the extracellular domain and LIN12 repeat regulatory sequences.\",\n      \"method\": \"Nucleotide sequence analysis, characterization of host-viral junction fragments from nine independent mammary tumors\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct sequence analysis of nine independent tumors, consistent mechanistic conclusion\",\n      \"pmids\": [\"9150355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The human NOTCH4 protein contains 29 EGF-like repeats, 3 Notch/lin-12 repeats, a transmembrane region, 6 cdc10/ankyrin repeats, and a PEST domain; two alternatively spliced isoforms (NOTCH4(L) and NOTCH4(S)) were identified; the promoter is TATA-less and contains RBP-Jkappa and GATA recognition sites.\",\n      \"method\": \"Genomic sequencing, Northern blot, cDNA isoform characterization\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — complete genomic sequence and structural characterization, replicated functional domain assignments\",\n      \"pmids\": [\"9693032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The activated Notch4(int-3) oncoprotein inhibits HGF- and TGF-beta2-induced branching morphogenesis of mammary epithelial cells. The minimal domain required for this inhibition consists of the CBF-1 (RBP-Jkappa) interaction domain and the cdc10/ankyrin repeat domain. Wnt-1 can overcome Notch4-mediated inhibition of branching morphogenesis.\",\n      \"method\": \"3D collagen gel branching morphogenesis assay, deletion mutant analysis in TAC-2 mammary epithelial cells\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution in cell-based assay with deletion mutagenesis defining required domains\",\n      \"pmids\": [\"9576833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Activated Notch4/int-3 (lacking most of the extracellular domain) disrupts normal alveolar epithelial morphogenesis and induces invasion of the extracellular matrix by mammary epithelial cells, and disrupts contact inhibition of proliferation.\",\n      \"method\": \"3D collagen gel morphogenesis assay, invasion assay in TAC-2 cells expressing Notch4(int-3)\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss/gain of function with defined cellular phenotype, two orthogonal readouts (morphogenesis and invasion)\",\n      \"pmids\": [\"10797286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Both activated Notch4/int-3 and Jagged-1 induce microvessel-like structures in rat brain endothelial cells. Activation of Notch signaling was confirmed by induction of endogenous Notch4 and Jagged-1 genes and proteins. Full-length Notch4 (without activation) did not affect these cells.\",\n      \"method\": \"Ectopic expression in RBE4 rat brain endothelial cells, morphological and biochemical characterization\",\n      \"journal\": \"Microvascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with defined phenotype and endogenous target gene induction as readout\",\n      \"pmids\": [\"10964583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Expression of activated Notch4 in embryonic endothelium (under Flk1/VEGFR regulation) causes embryonic lethality, restricted vascular development, disorganized vascular networks, large dilated vessels with compromised wall integrity, and abnormal yolk-sac vasculature, implicating Notch4 in vessel patterning and remodeling.\",\n      \"method\": \"Transgenic mouse model with Flk1-driven activated Notch4, in vivo vascular phenotyping\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo gain-of-function with defined vascular phenotype, replicated in subsequent studies\",\n      \"pmids\": [\"11344305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Constitutively active Notch4 inhibits endothelial sprouting and VEGF-induced angiogenesis. The mechanism involves activation of beta1-integrin into a high-affinity conformation (not increased surface expression), leading to increased adhesion to collagen and inhibition of migration through collagen. Activation of beta1-integrins alone is sufficient to inhibit VEGF-induced sprouting.\",\n      \"method\": \"In vitro endothelial sprouting assay (HMEC-1 cells), chick chorioallantoic membrane in vivo assay, flow cytometry for integrin conformation, function-activating beta1-integrin antibodies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal in vitro and in vivo assays with mechanistic dissection of integrin activation state\",\n      \"pmids\": [\"11909975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Constitutively active Notch4 intracellular domain inhibits endothelial apoptosis triggered by LPS via two mechanisms: (1) RBP-Jkappa-dependent inhibition of the JNK proapoptotic pathway, and (2) RBP-Jkappa-independent upregulation of Bcl-2. A Notch4 mutant lacking the RAM domain showed only partial anti-apoptotic activity but equivalent RBP-Jkappa transcriptional activation.\",\n      \"method\": \"Apoptosis assays in endothelial cells, RBP-Jkappa reporter assays, RAM-domain deletion mutants, Bcl-2 western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mechanistic dissection with deletion mutagenesis and two orthogonal pathway readouts in single study\",\n      \"pmids\": [\"14701863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Notch4-induced inhibition of endothelial sprouting requires the ankyrin repeats but not the RAM domain or C-terminal region. The ankyrin repeats alone are sufficient for RBP-Jkappa-dependent gene upregulation and partial inhibition of sprouting. N4IC reduced VEGFR-2 and VE-cadherin expression, but neither event alone is necessary and sufficient to explain inhibition. A constitutively active RBP-Jkappa mutant inhibits sprouting less strongly than full N4IC, suggesting RBP-Jkappa-dependent and -independent mechanisms.\",\n      \"method\": \"Quantitative endothelial sprouting assay with N4IC deletion mutants, RBP-Jkappa reporter assays, VEGFR-2/VE-cadherin expression analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — deletion mutagenesis defining required domain, multiple readouts, mechanistic dissection of RBP-Jkappa dependence\",\n      \"pmids\": [\"15187023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Constitutively active Notch4 (Notch4-IC) in human hematopoietic progenitors reduces colony-forming and short-term proliferative ability while increasing primitive progenitor content in long-term cultures. In vivo, Notch4-IC-transduced cells engraft more efficiently and generate an immature CD4+CD8+ T-cell population while blocking B-cell development.\",\n      \"method\": \"Retroviral transduction of human marrow/cord cells, long-term culture assay, transplantation into beta2-microglobulin-/- NOD/SCID mice\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo gain-of-function with defined hematopoietic phenotypes\",\n      \"pmids\": [\"15231576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The ANK domain and C-terminal domain of Int-3 (constitutively active Notch4) are important for inhibition of differentiation and growth arrest in myeloid leukemia cells. Expression of Int-3 in mouse bone marrow stem cells inhibits differentiation and expands colony-forming progenitors 3-5 fold.\",\n      \"method\": \"Retroviral transduction with Int-3 deletion mutants in HL-60 cells and mouse bone marrow, colony-forming assays, cell cycle analysis\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain deletion mutagenesis with defined functional readout in two cell systems\",\n      \"pmids\": [\"14961038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Notch4 intracellular domain (ICD4) binds to Smad2, Smad3, and Smad4 (with highest affinity to Smad3 via its MH2 domain, independent of the RAM23 region). ICD4 attenuates TGF-beta signaling: cells expressing ICD4 resist TGF-beta growth inhibition, and ICD4 inhibits Smad-binding element and 3TP luciferase reporter activity and PAI-1 expression. Blocking Notch4 processing by gamma-secretase inhibitor restores TGF-beta sensitivity in MCF-7 cells.\",\n      \"method\": \"Co-immunoprecipitation/binding assay, deletion analysis, luciferase reporter assays, RT-PCR, western blot, gamma-secretase inhibitor treatment\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding shown with deletion analysis, multiple functional readouts confirming pathway inhibition, single lab with orthogonal methods\",\n      \"pmids\": [\"16007227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NOTCH4 transcription in endothelial cells is regulated by cell-type-specific AP-1 complexes that occupy NOTCH4 chromatin. Intron 1 or upstream sequences are required for expression in the vasculature of transgenic mouse embryos. Vascular angiogenic factors activate AP-1 and can reprogram the endogenous NOTCH4 gene from a repressed to a transcriptionally active state in non-endothelial cells (HeLa).\",\n      \"method\": \"ChIP, RNA FISH, transfection assays, transgenic mice, endothelial cell-specific histone modification mapping\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (ChIP, transgenic reporter, RNA FISH, transfection) defining transcriptional mechanism\",\n      \"pmids\": [\"15684396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Endothelial expression of constitutively active Notch4 (int3) in adult mice causes profound blood vessel enlargement, AV shunting (hallmarks of AVM), and lethality. This is accompanied by arterialization including ectopic venous expression of ephrinB2, increased smooth muscle cells, and upregulation of endogenous Notch signaling. Repression of int3 expression reverses the vascular defects. Constitutively active Notch1 induces similar hepatic vascular lesions.\",\n      \"method\": \"Tetracycline-repressible transgenic system with endothelial-specific expression, vascular phenotyping, ephrinB2 immunostaining, doxycycline rescue\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible/reversible in vivo gain-of-function with mechanistic markers (ephrinB2, SMC), disease reversal upon repression\",\n      \"pmids\": [\"15994223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"VEGF upregulates DLL4 and presenilin, leading to activation of Notch4, which in turn upregulates ephrin B2 and downregulates EphB4, directing the differentiation of venous endothelial cells toward an arterial phenotype. Disruption of Notch4 signaling by presenilin inhibition or soluble DLL4 inhibits VEGF-induced venous endothelial cell migration and differentiation.\",\n      \"method\": \"In vitro HUVEC treatment, western blot, pharmacological inhibition (presenilin inhibitor, soluble DLL4), in vivo transgenic hepatocarcinoma mouse model with immunostaining\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway ordering demonstrated by pharmacological inhibition and in vivo expression data; single lab\",\n      \"pmids\": [\"16951162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"AP-1 and the glucocorticoid receptor (GR) synergistically activate Notch4 transcription in endothelial cells through a composite response element (imperfect half-glucocorticoid response element + AP-1 motif) in the Notch4 promoter. FGF-2 induces AP-1 occupancy and cortisol induces GR occupancy at this element; AP-1 stabilizes GR occupancy. In multipotent 10T1/2 cells, FGF-2 and cortisol reprogram the Notch4 locus from repressed to active state.\",\n      \"method\": \"ChIP, luciferase reporter assays, histone modification analysis, transfection in endothelial and 10T1/2 cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP-confirmed occupancy with composite response element, multiple orthogonal methods in one study\",\n      \"pmids\": [\"17220278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Constitutively active Notch4 in endothelial cells from birth causes brain AVMs (cerebral AV shunting, vessel enlargement, hemorrhage, neuronal death) in mice by 3 weeks. Repression of Notch4* (int3) resolves ataxia and reverses disease progression. int3 expression results in enlarged microvasculature coinciding with reduced capillary density, linking vessel enlargement to Notch's inhibition of vessel sprouting.\",\n      \"method\": \"Tetracycline-regulatable transgenic system (endothelial-specific, from birth), vascular phenotyping, doxycycline-mediated repression and disease reversal\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible and reversible in vivo model with mechanistic link to sprouting inhibition; disease reversal confirms requirement\",\n      \"pmids\": [\"18667694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Notch4 and Hes1 knockdown in endothelial cells enhances VCAM-1 expression, promotes apoptosis, and inhibits repair of endothelial injury, demonstrating that basal Notch4 activity is required to maintain EC quiescence and survival. TNFα decreases Notch4 expression predominantly via PI3-kinase signaling pathways, reducing CBF1 activity and Hes1 expression.\",\n      \"method\": \"siRNA knockdown, VCAM-1 expression assay, apoptosis assay, endothelial injury/repair assay, CBF1 reporter assay in arterial endothelial cells\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with defined cellular phenotypes and pathway reporter; single lab\",\n      \"pmids\": [\"18802018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rbpj conditional knockout in Notch4/Int3-expressing mammary glands normalizes mammary gland development (demonstrating developmental arrest requires RBP-Jkappa-dependent signaling), but mammary tumor development still occurs in Rbpj-null/Int3 mice, demonstrating that Notch4-induced mammary tumorigenesis is independent of RBP-Jkappa interaction.\",\n      \"method\": \"Conditional Rbpj knockout (Wap-Cre) in Wap-Int3 transgenic mice, mammary gland histology, tumor frequency analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with conditional KO cleanly dissecting RBP-Jkappa-dependent vs independent functions\",\n      \"pmids\": [\"18836481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Constitutively active Notch4 in adult mouse endothelium causes lung AV shunts and lung hemorrhages. Cessation of Notch4* expression reverses these effects. Whole lung organ culture confirmed the lung vascular effects are a primary lung phenomenon.\",\n      \"method\": \"Tetracycline-repressible transgenic system (endothelial-specific), vascular casting, fluorescent microsphere analysis, organ culture\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible/reversible in vivo model plus ex vivo organ culture confirmation\",\n      \"pmids\": [\"19933399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Notch4 signaling activity is 8-fold higher in breast cancer stem cell-enriched populations compared with differentiated cells. Pharmacologic or genetic inhibition of Notch4 reduces stem cell activity in vitro and reduces/abolishes tumor formation in vivo. Notch4 inhibition produces more robust suppression of tumor initiation than Notch1 inhibition.\",\n      \"method\": \"Stem cell enrichment by anoikis resistance or ESA+/CD44+/CD24low selection, in vitro stem cell activity assays, in vivo tumor formation assays, gamma-secretase inhibitor and siRNA knockdown\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss of function with defined stem cell and tumor formation readouts; single lab\",\n      \"pmids\": [\"20068161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Notch4 is specifically required for expression of the embryonic morphogen Nodal in aggressive melanoma cells via an RBPJ-dependent Nodal enhancer element. Notch4 regulates vasculogenic mimicry and anchorage-independent growth, effects mediated in part through Notch4 regulation of Nodal, placing Notch4 upstream of Nodal in this pathway.\",\n      \"method\": \"RBPJ-dependent Nodal enhancer luciferase reporter assay, siRNA knockdown of Notch4, vasculogenic mimicry and soft agar assays in aggressive melanoma cells\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay and siRNA knockdown identifying RBPJ-dependent Nodal regulation; single lab\",\n      \"pmids\": [\"21159651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Normalization of Notch signaling by repressing Notch4* expression converts large-caliber high-flow AV shunts to capillary-like vessels. This regression is initiated by vessel narrowing without loss of endothelial cells and requires restoration of EphB4 receptor expression by venous endothelial cells.\",\n      \"method\": \"4D two-photon imaging through cranial window, doxycycline-mediated Notch4* repression, EphB4 expression analysis\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live in vivo imaging of reversal with identification of EphB4 as required downstream mediator\",\n      \"pmids\": [\"22261032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PKCα selectively increases Notch-4 (but not Notch-1) expression through activator protein-1 (AP-1) occupancy of the Notch-4 promoter. Notch-4 knockdown inhibits estrogen-independent growth of PKCα-overexpressing cells, while Notch-4IC expression stimulates it.\",\n      \"method\": \"ChIP for AP-1 at Notch-4 promoter, siRNA knockdown, Notch-4IC overexpression, estrogen-independent growth assays\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-confirmed mechanism with functional validation; single lab\",\n      \"pmids\": [\"23917222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"YB-1 binding to the Notch4 promoter (12-fold enrichment by ChIP-on-ChIP) regulates Notch4 transcription. Silencing YB-1 decreases Notch4 mRNA; constitutively active YB-1 increases it. The RSK kinase phosphorylates YB-1 to activate this axis. Luteolin inhibits RSK, suppresses YB-1 phosphorylation, and thereby reduces Notch4 expression and N4ICD levels.\",\n      \"method\": \"ChIP-on-ChIP, siRNA knockdown of YB-1, YB-1 overexpression, in vitro kinase assay for RSK, luteolin treatment with RSK/YB-1/Notch4 correlation\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-on-ChIP with functional validation by siRNA and OE; single lab\",\n      \"pmids\": [\"23593654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NOTCH4 did not signal in response to ligand in cultured cells. Moreover, NOTCH4 inhibited signaling from NOTCH1 receptor in cis (first report of cis-inhibition by another Notch receptor). The NOTCH4 extracellular domain alone, expressed in cis, also inhibits NOTCH1 signaling. Notch4 null mice (entire coding region deleted) exhibit slightly delayed vessel growth in the retina.\",\n      \"method\": \"Cell-based signaling assays in cultured cells, NOTCH4 extracellular domain expression constructs, Notch4 null mouse generation (complete coding region deletion), retinal vascular analysis\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — novel cis-inhibition mechanism demonstrated with multiple constructs and null mouse; single rigorous study with orthogonal approaches\",\n      \"pmids\": [\"24667410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Brain AVMs arise from enlargement of preexisting microvessels with capillary diameter driven by increased individual endothelial cell area (not increased EC number/proliferation). AV shunting begins promptly after Notch4* expression. Altering Notch signaling in ECs of all vessels (but not arteries alone) affects AVM formation, suggesting Notch4 functions in the microvasculature/veins. A positive feedback loop of increasing blood flow and vessel diameter drives focal AVM growth.\",\n      \"method\": \"Time-lapse two-photon imaging through cranial windows, conditional endothelial Notch4* expression, hemodynamic measurements\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live in vivo imaging defining cellular mechanism with hemodynamic analysis; replicated across multiple papers\",\n      \"pmids\": [\"25468970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AKT binds to Notch4-ICD and phosphorylates it at four distinct sites in vitro and in vivo. This phosphorylation is regulated by growth factors and is sensitive to PI3K inhibitors. Phosphorylation generates binding sites for 14-3-3 proteins, which restrict phosphorylated Notch4-ICD to the cytoplasm, providing a negative regulatory mechanism for Notch4 nuclear signaling.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, in vivo phosphorylation assays, PI3K inhibitor treatment, 14-3-3 binding assay, subcellular localization analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus in vivo phosphorylation with multiple orthogonal methods defining mechanism; single lab\",\n      \"pmids\": [\"25740432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"JAG1-NOTCH4 receptor activation in breast cancer cells is induced by anti-estrogens (tamoxifen, fulvestrant) and drives breast cancer stem cell (BCSC) activity and anti-estrogen resistance. Targeting NOTCH4 reverses the increase in BCSC activity induced by anti-estrogens in patient-derived and PDX tumor samples.\",\n      \"method\": \"Primary patient samples and PDX models, BCSC activity assays (ALDH1, mammosphere), NOTCH4 inhibition by antibody/siRNA, in vivo tumor assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway (JAG1-NOTCH4-BCSC) validated in patient-derived and PDX models; single lab\",\n      \"pmids\": [\"26387946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Expression of constitutively active Notch4 intracellular domain (N4ICD) in melanoma cells induces Hey1 and Hey2, which bind directly to promoter regions of Snail2 and Twist1 and repress their transcription (demonstrated by EMSA and luciferase assays), causing a mesenchymal-to-epithelial-like switch, reduced invasion and migration, and reduced tumor growth in vivo.\",\n      \"method\": \"N4ICD expression, EMSA, luciferase reporter assays for Snail2 and Twist1 promoters, Hey1/Hey2 ChIP, in vivo xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding of Hey1/Hey2 to target promoters demonstrated by EMSA and luciferase assay; functional validation in vivo\",\n      \"pmids\": [\"26801977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NOTCH4 transcriptionally activates HEY1 in head and neck squamous cell carcinoma, and the NOTCH4-HEY1 axis drives EMT (decreased E-cadherin, increased Vimentin, Fibronectin, TWIST1, SOX2), proliferation, cisplatin resistance, and increased invasion/migration.\",\n      \"method\": \"siRNA knockdown, TCGA data analysis, in vitro proliferation/apoptosis/cell-cycle/invasion/migration assays\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with multiple functional readouts; single lab, no ChIP validation of direct transcriptional activation\",\n      \"pmids\": [\"29146722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RUNX1 negatively controls NOTCH4 expression via a novel regulatory DNA element within the NOTCH4 locus. Specific CRISPR-Cas9-mediated inactivation of NOTCH4 in human iPSCs enhances megakaryopoiesis. Small-molecule Notch signaling inhibitors promote megakaryocyte generation from human iPSCs and postnatal CD34+ hematopoietic stem/progenitor cells.\",\n      \"method\": \"Integrative genomic analysis of FPD-iPSCs, improved CRISPR-Cas9 NOTCH4 knockout in human iPSCs, MK differentiation assays, Notch inhibitor treatment of CD34+ cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — CRISPR KO with defined functional readout; genomic identification of RUNX1 regulatory element; multiple approaches\",\n      \"pmids\": [\"29101237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Notch4 intracellular domain interacts with TAK1 and inhibits its activation; Notch4 also prevents TRAF6 autoubiquitination and suppresses TRAF6-mediated TAK1 polyubiquitination, thereby inhibiting M. tuberculosis-induced proinflammatory cytokine production. Notch4-deficient mice show lower bacterial burden and reduced lung pathology after M. tuberculosis infection.\",\n      \"method\": \"Co-immunoprecipitation (Notch4-TAK1 interaction), ubiquitination assays (TRAF6 autoubiquitination, TAK1 polyubiquitination), Notch4-deficient mice, in vivo infection model\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct protein interaction by Co-IP combined with ubiquitination mechanism assays and in vivo KO validation\",\n      \"pmids\": [\"29228365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NOTCH4 transcriptionally upregulates SLUG and GAS1 in TNBC cells; dual-luciferase reporter and ChIP assays identified genuine NOTCH4 binding sites on SLUG and GAS1 promoters. NOTCH4-SLUG upregulation promotes EMT, and NOTCH4-GAS1 upregulation promotes quiescence in mesenchymal-like breast cancer stem cells. SLUG also harnesses GAS1 via its anti-apoptotic function.\",\n      \"method\": \"Dual-luciferase reporter assay, ChIP, RNA-seq, stable OE/KD cell lines, mammosphere formation, chemoresistance assays, in vivo serial dilution\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct transcriptional targets confirmed by ChIP and luciferase reporter with multiple functional validations; single lab\",\n      \"pmids\": [\"32104513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"IL-6/STAT3-dependent upregulation of Notch4 on lung tissue regulatory T cells is necessary for allergen/pollutant-induced airway inflammation. Notch4 subverts Treg cells into TH2 and TH17 effector T cells via Wnt and Hippo pathway-dependent mechanisms. Wnt activation in Tregs induces GDF15 expression, which activates group 2 innate lymphoid cells to amplify inflammation.\",\n      \"method\": \"Conditional Notch4 deletion in Treg cells (mouse models), anti-Notch4 antibody therapy, Wnt/Hippo pathway inhibitors, human circulating Treg cell analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO plus antibody therapy with defined mechanistic pathway (Wnt/Hippo/GDF15) and human correlation\",\n      \"pmids\": [\"32929274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Notch4 on regulatory T cells suppresses induction of amphiregulin (a tissue repair cytokine) by IL-18. Deletion of Notch4 in Treg cells or anti-Notch4 antibody therapy rescues disease morbidity and mortality in influenza and synthetic viral RNA models. Protection by Notch4 inhibition is recapitulated by amphiregulin therapy and abrogated by its antagonism.\",\n      \"method\": \"Treg-specific Notch4 deletion (conventional and humanized mice), anti-Notch4 antibody therapy, amphiregulin administration/antagonism, prospective COVID-19 patient cohort\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO and antibody therapy in multiple models with mechanistic rescue/antagonism experiments identifying amphiregulin as downstream effector\",\n      \"pmids\": [\"33915108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Notch4 null mice have increased closure of lymphangiogenic fronts, reduced lymphatic vessel caliber at E14.5, and reduced branching at E16.5. Notch4 activation suppresses lymphatic endothelial cell migration more strongly than Notch1 activation. Loss of Notch4 does not affect canonical LEC Notch signaling, indicating Notch4 and canonical Notch signaling have distinct functions in lymphangiogenesis.\",\n      \"method\": \"Notch4 null mice, embryonic dermal lymphatic analysis, LEC migration wounding assay, comparison with DNMAML (canonical Notch blockade) Prox1-Cre mice\",\n      \"journal\": \"Angiogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — null mice combined with epistasis experiment (DNMAML) distinguishing Notch4 from canonical Notch signaling in same tissue\",\n      \"pmids\": [\"34665379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Disturbed blood flow activates the JAG1-NOTCH4 signaling pathway in endothelial cells. EC-specific deletion of Jag1 (Jag1) in mice demonstrates JAG1 promotes atherosclerosis at sites of disturbed flow. Single-cell RNA sequencing showed Jag1 suppresses subsets of ECs that proliferate and migrate.\",\n      \"method\": \"Porcine and murine artery exposure to disturbed flow, cultured human coronary artery ECs, light-sheet imaging, EC-specific Jag1 conditional KO mice, single-cell RNA sequencing\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro mechanosensing assay, in vivo conditional KO with single-cell RNA-seq; multiple organisms and orthogonal approaches\",\n      \"pmids\": [\"36044575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Notch4 interacts with ERK, JNK, and P38 MAPK (confirmed by co-immunoprecipitation) and promotes HPASMC proliferation and migration while inhibiting apoptosis via these signaling pathways. AAV1-mediated Notch4 silencing in vivo reduces right ventricular systolic pressure and pulmonary vascular remodeling in hypoxic rats.\",\n      \"method\": \"Co-immunoprecipitation (Notch4-ERK/JNK/P38), siRNA knockdown and overexpression in HPASMCs, cell viability/proliferation/apoptosis/migration assays, AAV1-si-Notch4 in vivo\",\n      \"journal\": \"Respiratory research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of Notch4-MAPK interaction with functional validation in vitro and in vivo; single lab\",\n      \"pmids\": [\"35016680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"IL-4Rα R576 variant upregulates Notch4 expression on lung Treg cells in an IL-6- and GRB2-dependent manner. Signaling via IL-4RαR576 upregulates Notch4 and its downstream mediators Yap1 and beta-catenin in lung Tregs, leading to exacerbated lung inflammation. Treg-specific Notch4 deletion or anti-Notch4 antibody inhibits this augmented inflammation.\",\n      \"method\": \"Il4raR576 knock-in mouse model, Treg-specific Notch4 deletion, GRB2 and IL-6R inhibition, Yap1/beta-catenin expression analysis, human PBMC analysis\",\n      \"journal\": \"Allergy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic mouse models with conditional KO, multiple pathway inhibitors, and human correlation identifying GRB2-IL-6-Notch4 circuit\",\n      \"pmids\": [\"35841382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Constitutively active Notch4 intracellular domain promotes proliferation of 3T3-L1 preadipocytes through the ERK pathway and cell cycle modulation, and facilitates differentiation by upregulating adipogenic genes (C/EBPα, PPARγ, aP2, LPL, HSL) and repressing the inhibitor Pref-1. HES1, Hey1, C/EBPδ, and PPARγ are upregulated downstream of N4IC.\",\n      \"method\": \"Transient and stable transfection of N4IC in 3T3-L1 cells, qRT-PCR, western blot, proliferation and differentiation assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — gain-of-function with defined gene expression readouts; single lab, single method set\",\n      \"pmids\": [\"23237809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PEA3 (ETS transcription factor) directly activates Notch-4 transcription in MDA-MB-231 breast cancer cells; ChIP confirmed enrichment of PEA3 on the Notch-4 promoter. PEA3 recruitment to the Notch-4 promoter is c-JUN (AP-1)-dependent, while its recruitment to Notch-1 is AP-1-independent. A Notch-4 luciferase reporter confirmed PEA3/AP-1 activation.\",\n      \"method\": \"ChIP, siRNA knockdown, Notch-4 luciferase reporter assay, TAM-67 and c-Jun siRNA, real-time PCR\",\n      \"journal\": \"Breast cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirmed PEA3 occupancy with luciferase reporter and AP-1 dependence; single lab\",\n      \"pmids\": [\"21679465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"VEGF165 inhibits pro-fibrotic differentiation of endometrial stromal cells via the DLL4/Notch4/Smad7 pathway; inhibition of Smad7 or Notch4 expression, or blockade of Notch signaling, abrogates this beneficial VEGF165 effect, indicating Smad7 and Notch4 are essential downstream effectors.\",\n      \"method\": \"siRNA knockdown of Notch4/Smad7, Notch signaling inhibitor, TGFβ1-induced fibrotic model in primary human endometrial stromal cells, conditional VEGF knockout mice\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway ordering by siRNA and pharmacological inhibition with defined fibrosis phenotype; single lab\",\n      \"pmids\": [\"31515487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Hypoxia activates Delta-like 4 and Notch4 in lung adenocarcinoma (LUAD) cells; Notch4 physically interacts with ERK, JNK, and P38 (confirmed by Co-IP) and their activation is required for Notch4's pro-proliferative, anti-apoptotic, and pro-migratory effects, which are reversed by pathway inhibitors.\",\n      \"method\": \"Co-immunoprecipitation (Notch4-ERK/JNK/P38), siRNA/OE, MAPK inhibitors, in vitro proliferation/apoptosis/migration, in vivo xenograft models\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP confirmed interaction with pharmacological rescue; single lab\",\n      \"pmids\": [\"34988077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NOTCH4 exhibits anti-inflammatory activity in macrophages by (1) interfering with STAT1-dependent transcription downstream of IFN-γ, favoring STAT3 over STAT1 phosphorylation without affecting their expression; (2) inhibiting NF-κB transcriptional activity via diminished STAT1 activation downstream of TLR/LPS. HES1 mediates, at least in part, the enhancement of STAT3 activation by NOTCH4.\",\n      \"method\": \"NOTCH4 overexpression/knockdown in macrophages, STAT1/STAT3 phosphorylation western blot, NF-κB luciferase reporter, IRF1/SOCS1/CXCL10 expression analysis, Hes1 reporter\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple signaling pathway readouts with OE/KD; single lab, no structural or in vitro reconstitution\",\n      \"pmids\": [\"34925319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Notch4 activation promotes HIV-associated nephropathy (HIVAN) disease progression; global deletion of the Notch4 intracellular domain in Tg26 mice (Notch4 ICD KO) significantly improved renal function, decreased mortality, reduced glomerular and tubulointerstitial injury, decreased interstitial inflammation, and reduced expression of IL-6, CCL2, and NF-κB (Nfkb1/p65).\",\n      \"method\": \"Notch4 ICD global deletion in Tg26 HIVAN mice, renal function assays, histology, cytokine qRT-PCR, NF-κB protein analysis\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ICD knockout with defined functional and molecular phenotypes; single lab\",\n      \"pmids\": [\"31727625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Retroviral splicing events between an intracisternal type A particle (IAP) and Notch4/int3 sequences generate two fusion transcripts encoding different portions of the intracellular domain (one with RAM domain, one without). These two proteins show different subcellular localizations in mammary epithelial cells (HC-11): both cytoplasm+nucleus vs. nucleus only.\",\n      \"method\": \"Sequence analysis of mammary tumor, immunofluorescence of transfected cells, subcellular localization analysis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single-tumor analysis with cell-based localization; mechanistically informative regarding RAM domain and nuclear localization\",\n      \"pmids\": [\"10233982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A truncated Notch4/Int3 protein lacking the CBF1-binding region (RAM23) localizes to both cytoplasm and nucleus (vs. nucleus-only for full Int3-ICD), and mammary tumors arising from its expression show activation of the Notch target Hes-1, but with longer latency, suggesting a gradient of CBF1-dependent Notch4 signaling determines the extent of oncogenicity.\",\n      \"method\": \"Immunofluorescence of transfected COS-1 cells, transgenic mouse mammary tumor model, RT-PCR/western blot for Hes-1\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct localization experiment with functional in vivo consequence; single lab\",\n      \"pmids\": [\"15531924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HIV protease inhibitor Nelfinavir (but not Saquinavir, Indinavir, or Ritonavir) specifically increases Notch4 processing and Notch4 intracellular domain nuclear localization, leading to induction of NFκB and MMP2 expression in cerebral endothelial cells. Pre-treatment with Vitamin E partially prevents Nelfinavir-induced changes in Notch4 processing and localization.\",\n      \"method\": \"Western blot for Notch4 processing, nuclear localization analysis, NFκB/MMP2 expression assay, antioxidant rescue experiment in cerebral endothelial cells\",\n      \"journal\": \"BMC neuroscience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacological experiment with localization readout; single lab, mechanistic link to reactive oxygen species only partial\",\n      \"pmids\": [\"18302767\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NOTCH4 is an endothelial cell-enriched transmembrane receptor that, upon ligand (e.g., JAG1, DLL4) binding, releases its intracellular domain (N4ICD) for nuclear translocation; N4ICD signals via RBP-Jkappa (ankyrin repeat-dependent) to inhibit endothelial sprouting and promote survival, and via RBP-Jkappa-independent mechanisms (Bcl-2 upregulation, beta1-integrin activation, TAK1/TRAF6 suppression) to regulate apoptosis, inflammation, and vascular remodeling; constitutively active NOTCH4 drives arteriovenous malformations and atherosclerosis in vivo by enlarging capillary-like vessels and inducing arterial characteristics, while in immune cells (Treg cells) NOTCH4 suppresses amphiregulin-dependent tissue repair and GDF15-mediated tolerance, and in cancer stem cells NOTCH4 maintains stemness through transcriptional activation of SLUG, GAS1, and Nodal; nuclear localization of N4ICD is negatively regulated by AKT-mediated phosphorylation generating 14-3-3 binding sites, and NOTCH4 transcription itself is controlled by AP-1, GR, PEA3/c-Jun, YB-1/RSK, and RUNX1 regulatory inputs.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NOTCH4 is an endothelial-enriched transmembrane Notch receptor whose intracellular domain (N4ICD) couples cell-surface ligand sensing to transcriptional and signaling programs that govern vascular remodeling, cell survival, and inflammation [#0, #2]. Structurally it comprises 29 EGF-like repeats, LIN-12/Notch repeats, a transmembrane region, cdc10/ankyrin repeats, and a PEST domain; the int-3 oncogene encodes only the intracellular domain, and loss of the extracellular and LIN-12 regulatory regions renders the receptor constitutively active [#0, #1, #2]. Activated NOTCH4 signals partly through RBP-Jkappa (CBF-1) via its ankyrin repeats and partly through RBP-Jkappa-independent routes: the ankyrin repeats alone drive RBP-Jkappa-dependent transcription and partial inhibition of endothelial sprouting, while a constitutively active RBP-Jkappa recapitulates this only weakly, defining parallel dependent and independent outputs [#8, #9, #19]. In the vasculature, constitutively active NOTCH4 inhibits VEGF-induced endothelial sprouting and angiogenesis—in part by switching beta1-integrin to a high-affinity conformation that increases collagen adhesion—and promotes endothelial survival via RBP-Jkappa-dependent JNK suppression and RBP-Jkappa-independent Bcl-2 upregulation [#7, #8, #18]. In vivo, endothelial expression of activated NOTCH4 produces arteriovenous malformations through enlargement of capillary-caliber microvessels driven by increased individual endothelial-cell area, with arterialization marked by ephrinB2 induction; these lesions reverse upon transgene repression and require restoration of venous EphB4 expression, and the receptor acts downstream of VEGF/DLL4 to direct arterial differentiation [#14, #15, #23, #27]. NOTCH4 nuclear signaling is negatively gated by AKT, which phosphorylates N4ICD at four sites to generate 14-3-3 binding sites that retain it in the cytoplasm [#28]. Beyond canonical activation, NOTCH4 cis-inhibits NOTCH1 signaling, and its own transcription is controlled by AP-1, glucocorticoid receptor, PEA3/c-Jun, YB-1/RSK, and RUNX1 inputs in a cell-type-specific manner [#13, #16, #26, #25, #42, #32]. In cancer, NOTCH4 maintains breast cancer stem-cell activity and anti-estrogen resistance and directly transactivates SLUG, GAS1, HEY1, and Nodal to control EMT, quiescence, and tumorigenesis [#21, #29, #34, #22, #30]. In immune cells, NOTCH4 on regulatory T cells suppresses amphiregulin-dependent tissue repair and subverts Tregs toward TH2/TH17 effector fates via Wnt/Hippo and GDF15 mechanisms, while in macrophages it acts anti-inflammatory by favoring STAT3 over STAT1 and suppressing NF-kappaB, and it dampens TLR/TAK1 signaling by binding TAK1 and blocking TRAF6 ubiquitination [#35, #36, #45, #33].\"\n  ,\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established NOTCH4 as an endothelial-restricted transmembrane Notch receptor and identified the int-3 oncogene as its constitutively active, extracellular-domain-less intracellular fragment, framing the receptor's activation logic.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, and in situ hybridization; sequence analysis of nine MMTV-induced tumors\",\n      \"pmids\": [\"8681805\", \"9150355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the physiological ligand or the proteolytic activation steps for full-length receptor\", \"Endothelial restriction left the breast-tumor context mechanistically unexplained\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Resolved the full domain architecture and promoter features of human NOTCH4 and showed that the CBF-1/RBP-Jkappa interaction domain plus the ankyrin repeats constitute the minimal effector module for biological output.\",\n      \"evidence\": \"Genomic sequencing and isoform characterization; deletion-mutant branching morphogenesis assays in mammary epithelial cells\",\n      \"pmids\": [\"9693032\", \"9576833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate RBP-Jkappa-dependent from -independent contributions\", \"Ligand-driven activation not addressed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrated in vivo that activated NOTCH4 in embryonic endothelium disrupts vessel patterning and remodeling, establishing a developmental vascular role beyond cell culture.\",\n      \"evidence\": \"Flk1-driven activated Notch4 transgenic mouse with vascular phenotyping\",\n      \"pmids\": [\"11344305\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Embryonic lethality precluded adult analysis\", \"Downstream effectors of vessel dilation undefined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Dissected NOTCH4 survival signaling into RBP-Jkappa-dependent JNK suppression and RBP-Jkappa-independent Bcl-2 upregulation, defining parallel anti-apoptotic outputs.\",\n      \"evidence\": \"Apoptosis assays, RBP-Jkappa reporters, RAM-domain deletion, and Bcl-2 western blot in endothelial cells\",\n      \"pmids\": [\"14701863\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular route to Bcl-2 induction not mapped\", \"Relevance to in vivo vascular phenotypes not tested here\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified beta1-integrin conformational activation as a non-transcriptional mechanism by which NOTCH4 inhibits endothelial sprouting, mechanistically linking the receptor to angiogenesis control.\",\n      \"evidence\": \"In vitro sprouting and chick CAM assays, integrin-conformation flow cytometry, function-activating antibodies\",\n      \"pmids\": [\"11909975\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How N4ICD activates integrin conformation biochemically is unresolved\", \"Did not connect integrin activation to the in vivo AVM phenotype\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapped the ankyrin repeats as necessary and sufficient for RBP-Jkappa-dependent gene activation and partial sprouting inhibition, while showing a constitutively active RBP-Jkappa underperforms full N4ICD—formally establishing RBP-Jkappa-independent signaling.\",\n      \"evidence\": \"Endothelial sprouting assays with N4IC deletion mutants and RBP-Jkappa reporters; hematopoietic progenitor transduction assays\",\n      \"pmids\": [\"15187023\", \"15231576\", \"14961038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of RBP-Jkappa-independent partners not determined\", \"VEGFR-2/VE-cadherin downregulation insufficient to explain phenotype\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed NOTCH4 cross-talks with TGF-beta by binding Smad2/3/4 to attenuate TGF-beta signaling, and that endothelial AP-1 complexes occupy NOTCH4 chromatin to drive its tissue-specific transcription.\",\n      \"evidence\": \"Co-IP/binding and deletion analysis with reporters and gamma-secretase inhibition; ChIP, RNA FISH, and transgenic reporters\",\n      \"pmids\": [\"16007227\", \"15684396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological setting of Smad antagonism within endothelium not established\", \"Upstream signals controlling AP-1 occupancy only partially defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Established that adult endothelial activation of NOTCH4 causes reversible AV malformations with arterialization, providing a tractable disease model and linking the receptor to ephrinB2-driven arterial identity.\",\n      \"evidence\": \"Tetracycline-repressible endothelial transgenic mice with ephrinB2 immunostaining and doxycycline rescue\",\n      \"pmids\": [\"15994223\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not yet resolve whether vessel enlargement reflects cell-size versus cell-number changes\", \"Downstream effector required for reversal unidentified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed NOTCH4 downstream of VEGF/DLL4 in a cascade that upregulates ephrinB2 and downregulates EphB4 to specify arterial endothelial fate.\",\n      \"evidence\": \"HUVEC treatment with pharmacological inhibition (presenilin, soluble DLL4) and in vivo hepatocarcinoma model\",\n      \"pmids\": [\"16951162\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pharmacological inhibitors are not NOTCH4-specific\", \"Direct transcriptional control of ephrinB2 by N4ICD not shown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a composite AP-1/glucocorticoid-receptor response element through which FGF-2 and cortisol cooperatively reprogram the NOTCH4 locus, extending transcriptional control to hormonal and growth-factor inputs.\",\n      \"evidence\": \"ChIP, luciferase reporters, and histone-modification analysis in endothelial and 10T1/2 cells\",\n      \"pmids\": [\"17220278\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts where GR and AP-1 converge on NOTCH4 not delineated\", \"In vivo requirement of the composite element untested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed brain AVMs from activated NOTCH4 arise from enlarged microvasculature with reduced capillary density, mechanistically tying the disease to NOTCH4's inhibition of sprouting, and that basal NOTCH4 maintains EC quiescence and survival.\",\n      \"evidence\": \"Inducible/reversible endothelial transgenic mice with disease reversal; endothelial siRNA knockdown with VCAM-1, apoptosis, and injury-repair assays\",\n      \"pmids\": [\"18667694\", \"18802018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular basis of vessel enlargement not yet imaged at single-cell resolution\", \"TNFalpha-PI3K suppression of NOTCH4 mechanism only outlined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genetically separated NOTCH4 oncogenic functions, demonstrating RBP-Jkappa-dependent developmental arrest but RBP-Jkappa-independent mammary tumorigenesis.\",\n      \"evidence\": \"Conditional Rbpj knockout in Wap-Int3 transgenic mice with histology and tumor frequency\",\n      \"pmids\": [\"18836481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The RBP-Jkappa-independent oncogenic effector remained unidentified\", \"Did not address whether vascular phenotypes share this independence\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended the reversible AVM model to adult lung, confirming organ-intrinsic NOTCH4-driven AV shunting.\",\n      \"evidence\": \"Tetracycline-repressible endothelial transgenic mice, vascular casting, and whole-lung organ culture\",\n      \"pmids\": [\"19933399\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific modifiers of lung versus brain AVM not defined\", \"Downstream signaling not dissected in this study\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified NOTCH4 as a dominant driver of cancer stem-cell activity and, in melanoma, an RBP-Jkappa-dependent activator of the embryonic morphogen Nodal, linking the receptor to tumor initiation and plasticity.\",\n      \"evidence\": \"Stem-cell enrichment and tumor-formation assays with gamma-secretase inhibition and siRNA; RBPJ-dependent Nodal enhancer reporter and vasculogenic-mimicry assays\",\n      \"pmids\": [\"20068161\", \"21159651\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct NOTCH4 promoter occupancy on stemness targets not shown here\", \"Single-lab observations awaiting orthogonal confirmation\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed PEA3 directly activates NOTCH4 transcription in a c-Jun/AP-1-dependent manner distinct from its NOTCH1 regulation, refining the transcriptional logic that distinguishes the two receptors.\",\n      \"evidence\": \"ChIP, siRNA, NOTCH4 luciferase reporter with TAM-67 and c-Jun knockdown in breast cancer cells\",\n      \"pmids\": [\"21679465\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of PEA3-driven NOTCH4 not tested in vivo\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated by live imaging that AV-shunt regression upon NOTCH4 normalization proceeds via vessel narrowing without EC loss and requires restored venous EphB4 expression, identifying EphB4 as the key downstream mediator of reversal.\",\n      \"evidence\": \"4D two-photon cranial-window imaging with doxycycline-mediated transgene repression and EphB4 analysis\",\n      \"pmids\": [\"22261032\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NOTCH4 represses EphB4 mechanistically not resolved\", \"Translatability of reversal to human AVM untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Expanded NOTCH4 transcriptional regulation to PKCalpha/AP-1 and a YB-1/RSK axis, connecting kinase signaling to NOTCH4 expression and estrogen-independent growth.\",\n      \"evidence\": \"ChIP, siRNA/overexpression, in vitro RSK kinase assays, and luteolin treatment in breast cancer cells; N4IC adipocyte differentiation assays\",\n      \"pmids\": [\"23917222\", \"23593654\", \"23237809\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of YB-1/RSK and PKCalpha control not established\", \"Adipocyte role rests on a single gain-of-function dataset\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed that NOTCH4 fails to signal in response to ligand in culture and instead cis-inhibits NOTCH1, while germline Notch4-null mice show only mild retinal vascular delay—reframing NOTCH4 as an atypical, partly inhibitory Notch receptor.\",\n      \"evidence\": \"Cell-based signaling assays, extracellular-domain constructs, and complete-coding-region Notch4-null mice with retinal analysis\",\n      \"pmids\": [\"24667410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mild null phenotype contrasts with strong gain-of-function effects, leaving physiological role uncertain\", \"Structural basis of cis-inhibition undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified AKT-mediated phosphorylation of N4ICD at four sites generating 14-3-3 binding sites that retain it in the cytoplasm, defining a growth-factor/PI3K-controlled brake on NOTCH4 nuclear signaling, and connected JAG1-NOTCH4 to anti-estrogen-induced breast cancer stem-cell resistance.\",\n      \"evidence\": \"In vitro/in vivo kinase and phosphorylation assays, 14-3-3 binding, localization analysis; PDX and patient-sample BCSC assays with NOTCH4 inhibition\",\n      \"pmids\": [\"25740432\", \"26387946\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AKT-14-3-3 gating operates in endothelial AVM remains untested\", \"Phosphosite mutants not validated in vivo\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed N4ICD induces Hey1/Hey2 that directly repress Snail2 and Twist1 promoters to drive a mesenchymal-to-epithelial switch in melanoma, demonstrating context-dependent, anti-invasive transcriptional output.\",\n      \"evidence\": \"N4ICD expression, EMSA, Hey1/Hey2 ChIP and promoter reporters, and xenografts\",\n      \"pmids\": [\"26801977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Apparent opposite EMT effects across cancer types not reconciled\", \"Determinants of Hey1/2 target selection unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established the NOTCH4-HEY1 axis as a driver of EMT and cisplatin resistance in head and neck cancer and identified RUNX1 as a negative transcriptional regulator of NOTCH4 whose loss enhances megakaryopoiesis.\",\n      \"evidence\": \"siRNA and TCGA analysis with functional assays; integrative genomics and CRISPR-Cas9 NOTCH4 knockout in iPSCs with MK differentiation\",\n      \"pmids\": [\"29146722\", \"29101237\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct NOTCH4 binding to HEY1 promoter not demonstrated in the HNSCC study\", \"RUNX1 regulatory element function not tested in vivo\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a non-canonical anti-inflammatory mechanism whereby N4ICD binds TAK1 and blocks TRAF6 autoubiquitination to suppress proinflammatory cytokine production, with Notch4-deficient mice resisting M. tuberculosis.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, and Notch4-deficient mouse infection model\",\n      \"pmids\": [\"29228365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this requires nuclear N4ICD or cytoplasmic pools is unclear\", \"Generalizability beyond mycobacterial infection not shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Implicated NOTCH4 as a downstream effector in profibrotic and renal-injury contexts, with N4ICD deletion improving HIV-associated nephropathy and reducing NF-kappaB/IL-6/CCL2.\",\n      \"evidence\": \"siRNA/pathway inhibition in endometrial stromal fibrosis; Notch4 ICD global knockout in Tg26 HIVAN mice with cytokine and histology analysis\",\n      \"pmids\": [\"31515487\", \"31727625\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular targets of NOTCH4 in these tissues undefined\", \"Single-lab in vivo observations\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified SLUG and GAS1 as direct NOTCH4 transcriptional targets controlling EMT and stem-cell quiescence in TNBC, and established a Treg-intrinsic NOTCH4 program that subverts regulatory T cells into TH2/TH17 effectors via Wnt/Hippo and GDF15.\",\n      \"evidence\": \"ChIP and dual-luciferase reporters with stable OE/KD and in vivo serial dilution; conditional Treg Notch4 deletion, anti-Notch4 antibody, and Wnt/Hippo inhibitors with human Treg analysis\",\n      \"pmids\": [\"32104513\", \"32929274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream ligand and activation step driving Treg NOTCH4 signaling not fully defined here\", \"Whether SLUG/GAS1 control generalizes beyond TNBC untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed NOTCH4 on Tregs suppresses IL-18-induced amphiregulin to impair tissue repair in viral injury, and that NOTCH4 has distinct, non-canonical roles in lymphangiogenesis and macrophage inflammation, broadening its immune and vascular repertoire.\",\n      \"evidence\": \"Treg-specific Notch4 deletion and antibody therapy with amphiregulin rescue and a COVID-19 cohort; Notch4-null lymphatic analysis with DNMAML epistasis; macrophage STAT1/STAT3 and NF-kappaB assays; MAPK Co-IP in lung adenocarcinoma\",\n      \"pmids\": [\"33915108\", \"34665379\", \"34925319\", \"34988077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NOTCH4 mechanistically biases STAT3 over STAT1 beyond HES1 is incomplete\", \"Reconciliation of pro- and anti-inflammatory roles across cell types unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected JAG1-NOTCH4 to flow-mechanosensing in atherosclerosis and to MAPK-dependent pulmonary vascular remodeling, and tied an IL-4Ralpha variant to GRB2/IL-6-driven NOTCH4 induction on Tregs that exacerbates lung inflammation.\",\n      \"evidence\": \"Disturbed-flow models with EC-specific Jag1 knockout and scRNA-seq; Notch4-MAPK Co-IP with AAV1 silencing in hypoxic rats; Il4raR576 knock-in with Treg Notch4 deletion and human PBMC analysis\",\n      \"pmids\": [\"36044575\", \"35016680\", \"35841382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets downstream of flow-activated NOTCH4 not defined\", \"MAPK interaction studies remain single-lab Co-IP-based\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how NOTCH4's atypical, largely ligand-unresponsive and cis-inhibitory behavior reconciles with the strong, RBP-Jkappa-dependent and -independent outputs of its constitutively active intracellular domain across endothelium, immune cells, and cancer.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of NOTCH4 or its cis-inhibitory interface with NOTCH1\", \"The physiological ligand-dependent signaling state versus gain-of-function biology is not unified\", \"The full set of RBP-Jkappa-independent effectors mediating tumorigenesis and inflammation is incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 7, 26]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [8, 9, 30, 34, 22]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [26, 12, 33]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [28, 47, 48]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [28, 47, 48]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 9, 28, 33]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 14, 27, 37]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [33, 35, 36, 45]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [13, 16, 30, 34]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 17, 38, 46]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"RBPJ\",\n      \"JAG1\",\n      \"DLL4\",\n      \"NOTCH1\",\n      \"SMAD3\",\n      \"AKT1\",\n      \"TAK1\",\n      \"TRAF6\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}