{"gene":"NOTCH1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2017,"finding":"Ligand-induced endocytosis of Notch1 into SARA-positive endosomes is required for signal transduction; inhibition of clathrin- and dynamin-dependent endocytosis in the receptor-expressing cell impairs ligand-induced Notch1 signaling, and Notch1 endocytosis is accompanied by transendocytosis of ligand into the signal-receiving cell.","method":"Live-cell imaging, clathrin/dynamin inhibition, ligand-expressing co-culture","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 / Moderate — live-cell imaging with functional inhibition of endocytosis, multiple orthogonal approaches in one study resolving conflicting prior reports","pmids":["26522918"],"is_preprint":false},{"year":2018,"finding":"c-Src kinase physically interacts with the Notch1 intracellular domain (NICD), directly phosphorylates it at specific tyrosine residues downstream of β3 integrin/MAGP2 signaling, and this phosphorylation attenuates Notch1-mediated transcription by decreasing MAML recruitment to the co-transcriptional complex and reducing NICD half-life.","method":"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis, transcriptional reporter assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct phosphorylation demonstrated in vitro with mutagenesis of phosphorylation sites and functional transcriptional readout, single lab with multiple orthogonal methods","pmids":["30341382"],"is_preprint":false},{"year":2018,"finding":"The Notch1 intracellular domain (N1ICD) is reversibly acetylated in proliferating neonatal cardiomyocytes; acetylation extends N1ICD half-life and enhances its transcriptional activity to sustain cardiomyocyte proliferation and counteract apoptosis, while SIRT1 acts as a deacetylase that reverses N1ICD acetylation and dampens its stability.","method":"Acetylation assays, SIRT1 overexpression, constitutively acetylated N1ICD-p300 fusion protein, adeno-associated viral vector delivery, neonatal mouse apical resection model","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — biochemical acetylation assays, gain/loss of function, in vivo regeneration model, multiple orthogonal methods in one study","pmids":["29186476"],"is_preprint":false},{"year":2023,"finding":"SIRT1 deacetylates and promotes degradation of the active Notch1 intracellular domain (NICD); mechanistically, dapagliflozin reduces SIRT1 phosphorylation (preventing its ubiquitination/degradation), enabling nuclear SIRT1 translocation and binding to NICD, leading to NICD deacetylation, degradation, and inactivation of Notch1 signaling, thereby attenuating endothelial-mesenchymal transition.","method":"Western blotting, confocal proximity ligation assay, in vivo heart failure model, in vitro HUVEC/MAEC assays, SIRT1 inhibition experiments","journal":"Cardiovascular diabetology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity ligation and co-IP showing SIRT1-NICD interaction, in vivo and in vitro validation, single lab","pmids":["38017499"],"is_preprint":false},{"year":2023,"finding":"The microprotein N1DARP competitively disrupts the interaction between N1ICD and the deubiquitinase USP10, thereby promoting K11- and K48-linked polyubiquitination of N1ICD and its proteasome-mediated degradation, suppressing canonical and non-canonical Notch1 signaling in pancreatic cancer.","method":"Co-immunoprecipitation, ubiquitination assays, N1DARP knockout in organoids and KPC mice, cell-penetrating stapled peptide functional studies","journal":"Cell discovery","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — biochemical dissection of USP10-N1ICD interaction, ubiquitination assays, in vivo organoid and mouse models, multiple orthogonal methods","pmids":["37714834"],"is_preprint":false},{"year":2021,"finding":"RFC4 directly binds to the Notch1 intracellular domain (NICD1) and competitively abrogates CDK8/FBXW7-mediated degradation of NICD1, thereby stabilizing it; RFC4 is itself a transcriptional target of Notch1 signaling, forming a positive feedback loop that sustains NICD1 overactivation in NSCLC.","method":"Co-immunoprecipitation, pulldown, ubiquitination/degradation assays, transcriptional target validation, NSCLC cell lines and patient datasets","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, mechanistic degradation assay, feedback loop confirmed by multiple methods, single lab","pmids":["33976158"],"is_preprint":false},{"year":2015,"finding":"PI3K/AKT signaling inhibits lysosomal degradation of NOTCH1; withdrawal of PI3K/AKT activity leads to NOTCH1 tyrosine phosphorylation, monoubiquitination by the E3 ligase c-Cbl (shown by co-immunoprecipitation), and subsequent lysosomal degradation of NOTCH1 protein.","method":"PI3K inhibitor treatment, dominant-negative AKT transfection, ubiquitin capture assay, co-immunoprecipitation, colocalization analysis","journal":"Genes, chromosomes & cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ubiquitin capture assay demonstrating c-Cbl/NOTCH1 interaction, multiple functional methods, single lab","pmids":["26052821"],"is_preprint":false},{"year":2015,"finding":"FBW7 (FBXW7) E3 ubiquitin ligase mediates phosphorylation-dependent degradation of the Notch1 intracellular domain in the nucleus; loss of FBXW7 in hepatocellular carcinoma increases NICD levels and promotes cell migration and invasion via Notch1 downstream molecules.","method":"siRNA knockdown, Fbxw7 overexpression, migration/invasion assays, Western blot, tissue microarray","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional assays in cell lines with Fbxw7 knockdown/overexpression, established FBXW7-Notch1 degradation axis, single lab","pmids":["25955618"],"is_preprint":false},{"year":2019,"finding":"PLK1 interacts with NOTCH1 and regulates NOTCH1 expression at the G2/M transition; during DNA damage, PLK1 activity is inhibited, NOTCH1 expression is maintained, and arsenite-induced genotoxic stress causes a PLK1-dependent signaling response that antagonizes NOTCH1's role in the DNA damage checkpoint.","method":"Chemical library kinase screen, co-immunoprecipitation, cell cycle analysis, PLK1 inhibition, DNA damage assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase screen followed by co-IP and cell-cycle-coupled functional validation, single lab","pmids":["31597699"],"is_preprint":false},{"year":2017,"finding":"GSK3β regulates Notch1 signaling by controlling postendocytic receptor recycling; GSK3β inhibition increases Notch1 cell surface levels, elevates NICD production and signaling activity, and alters Notch1 localization within a tubulovesicular compartment.","method":"GSK3β inhibition, immunolocalization, Notch1 transport/recycling assays, NICD production measurement","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — receptor recycling and localization assays with functional signaling readout, single lab, multiple methods","pmids":["29237816"],"is_preprint":false},{"year":2011,"finding":"DDR1 receptor tyrosine kinase physically interacts with Notch1 (identified by tandem affinity protein purification); upon ligand-mediated DDR1 activation, Notch1 is activated and bound to DDR1, activating canonical Notch1 targets (Hes1, Hey2), and DDR1 knockdown abolishes collagen I-induced nuclear accumulation of active Notch1.","method":"Tandem affinity protein purification, co-immunoprecipitation, nuclear fractionation, DDR1 knockdown, gamma-secretase inhibitor treatment","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tandem affinity purification and co-IP for interaction, nuclear fractionation for functional consequence, single lab","pmids":["21398698"],"is_preprint":false},{"year":2008,"finding":"Notch1 intracellular domain physically interacts with phospho-Smad3 (pSmad3) in dendritic cells; overexpression of N1ICD facilitates pSmad3 nuclear translocation and enhances pSmad3 transcriptional activity on Smad-sensitive promoters, mechanistically linking Notch1 signaling to TGF-β-mediated Treg effector function.","method":"Co-immunoprecipitation, luciferase reporter assay, antibody blockade of Notch1/Jagged1, in vitro Treg suppression assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of N1ICD with pSmad3, reporter assay for transcriptional activity, functional Treg suppression readout, single lab","pmids":["18292500"],"is_preprint":false},{"year":2017,"finding":"Keratin 8 (K8) and its partner K18 physically interact with Notch1 receptor (shown by proximity ligation assay and co-immunoprecipitation in colonocytes); K8/K18 enhance Notch1 protein levels and activity in a dose-dependent manner, and K8 loss reduces full-length Notch1, NICD, and downstream target gene expression, shifting colonic differentiation toward goblet cell and enteroendocrine fates.","method":"Proximity ligation assay, co-immunoprecipitation, K8-knockout mice, CRISPR/Cas9 Caco-2 knockout, K8/K18 re-expression rescue","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus proximity ligation, in vivo knockout, in vitro CRISPR rescue, multiple orthogonal methods","pmids":["28475172"],"is_preprint":false},{"year":2020,"finding":"Fringe enzymes and canonical Notch ligands differentially regulate NOTCH1 vs. NOTCH2; DLL4 activates NOTCH1 more than twice as potently as NOTCH2 in the absence of Fringes; O-fucosylation on EGF8 and EGF12 of NOTCH1 is required for Lunatic Fringe-mediated enhancement of DLL1-NOTCH1 activation, and O-fucosylation on EGF9 is important for receptor trafficking of both NOTCH1 and NOTCH2.","method":"Cell-based Notch signaling and ligand-binding assays, mass spectrometry for O-fucose, Fringe enzyme mutagenesis, EGF domain O-fucose site mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cell-based functional assays combined with mass spectral glycan analysis and site-directed mutagenesis, multiple orthogonal approaches in one rigorous study","pmids":["32820046"],"is_preprint":false},{"year":2015,"finding":"Endothelial NOTCH1 is suppressed by inflammatory lipids (Ox-PAPC) and cytokines (TNF, IL-1β) through a STAT3-dependent mechanism; siRNA-mediated reduction of NOTCH1 in human aortic endothelial cells increases inflammatory molecules and monocyte binding in the absence of inflammatory stimulus, and endothelial Notch1 heterozygous mice show higher diet-induced atherosclerosis.","method":"siRNA knockdown, inflammatory lipid treatment, monocyte adhesion assay, Notch1 heterozygous mouse atherosclerosis model","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA functional studies in human ECs plus in vivo mouse atherosclerosis model, STAT3-dependent mechanism identified, multiple orthogonal methods","pmids":["26552708"],"is_preprint":false},{"year":2017,"finding":"Endothelial NOTCH1 functions as a mechanosensor: NOTCH1 localizes downstream of flow and canonical NOTCH signaling scales with the magnitude of fluid shear stress; NOTCH1 is required for maintenance of junctional integrity and suppression of proliferation under laminar shear stress, and loss of NOTCH1 destabilizes junctions and triggers proliferation through changes in intracellular calcium signaling.","method":"Shear stress assays, siRNA knockdown, live imaging, gene expression profiling, calcium signaling rescue experiments, adult endothelial Notch1-knockout mouse atherosclerosis model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanosensing functional assays with NOTCH1 KD, calcium rescue experiments, in vivo mouse model with atherosclerosis readout, multiple labs replicating parts","pmids":["29158473"],"is_preprint":false},{"year":2021,"finding":"Endothelial NOTCH1 activation suppresses VE-cadherin expression through the transcription factors SNAI1 (binding -373 E-box) and ERG (binding -134/-118 ETS element) on the VE-cadherin promoter; constitutive endothelial NICD1 expression in mice induces severe albuminuria associated with decreased VE-cadherin and reduced glomerular endothelial glycocalyx.","method":"NICD1 lentiviral infection, DLL4 treatment, VE-cadherin promoter analysis, transgenic mouse model (ZEG-NICD1/Tie2-tTA/Tet-O-Cre), SNAI1/ERG knockdown, monolayer permeability assay","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic model plus mechanistic promoter dissection with transcription factor knockdown, multiple orthogonal methods","pmids":["33435713"],"is_preprint":false},{"year":2017,"finding":"MEGF10 interacts with Notch1 via their respective intracellular domains (shown by reciprocal co-immunoprecipitation); the pathogenic MEGF10 p.C774R mutation impairs this interaction, and MEGF10 regulation of myoblast proliferation and migration is mediated at least in part through Notch1 signaling.","method":"Reciprocal co-immunoprecipitation, shRNA knockdown, pathogenic mutation overexpression, Megf10-/- mouse myoblast proliferation/migration assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP for interaction, pathogenic mutation disruption, cell functional assays, single lab","pmids":["28498977"],"is_preprint":false},{"year":2015,"finding":"In the intracellular domain swap mouse model, differences between Notch1 and Notch2 outcomes reflect signal strength (number of NICD molecules reaching the nucleus, integrating ligand-mediated release and nuclear translocation) and duration (half-life of NICD-RBPJk-MAML-DNA complexes); tissue-specific NICD stability differences are caused by alternative scissile bond choices by tissue-specific γ-secretase complexes.","method":"Intracellular domain swap mouse model, genetic epistasis across multiple tissues (T-cell development, skin, inner ear, lung, retina), gamma-secretase complex analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic in vivo genetic epistasis across multiple tissues with ICD-swap mouse model, mechanistic dissection of signal strength and duration","pmids":["26062937"],"is_preprint":false},{"year":2004,"finding":"p53 negatively regulates Notch1 activation during T-cell development through Presenilin1 (PS1): p53 represses PS1 expression, and PS1 cleaves Notch1 to release the NIC; Trp53-/- thymocytes show elevated NIC levels and altered CD4+/CD8+ T-cell ratios consistent with increased Notch1 activation, phenocopying NIC-overexpressing mice.","method":"Thymoma cell lines, Trp53-/- mouse thymocytes, NIC protein detection, flow cytometry for CD4/CD8 populations","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with p53-null mouse thymocytes, functional T-cell development readout, single lab","pmids":["14991602"],"is_preprint":false},{"year":2021,"finding":"Pericyte NOTCH3 and endothelial NOTCH1 cooperate for pericyte-induced vascular stabilization: DLL4 expression in pericytes is dependent on NOTCH3, and DLL4 is the key ligand activating endothelial NOTCH1; loss of either NOTCH3 or NOTCH1 decreases VE-cadherin accumulation at adherens junctions and increases junction motility in vitro.","method":"In vitro vascular co-culture models, siRNA knockdown of NOTCH1 and NOTCH3, VE-cadherin imaging, DLL4 ligand identification","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional co-culture model with siRNA knockdown and specific ligand identification, single lab","pmids":["34878922"],"is_preprint":false},{"year":2021,"finding":"Notch1 activation in podocytes drives diabetic kidney disease: conditional deletion of Notch1 (but not Notch2) in podocytes markedly ameliorates albuminuria and mesangial expansion in diabetic mice; Notch1-null podocytes are protected from apoptosis and dedifferentiation in vitro; deletion of Notch1 leads to compensatory upregulation of Notch2.","method":"NPHS2(cre)Notch1(flox/flox) conditional knockout mice, diabetic nephropathy model, in vitro podocyte apoptosis/dedifferentiation assays, Notch2 transgenic overexpression","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-type-specific conditional knockout with defined disease phenotype, in vitro mechanistic follow-up, receptor-specific comparison, single lab","pmids":["26293507"],"is_preprint":false},{"year":2019,"finding":"NOTCH1-ICD physically interacts with BTK (demonstrated by in situ proximity ligation assay); BCR stimulation increases nuclear NOTCH1-ICD and activates HES1, DTX1, and c-MYC transcription; ibrutinib (BTK inhibitor) disrupts NOTCH1-ICD/BTK complexes and reduces NOTCH1 activation in CLL.","method":"Western blotting, confocal proximity ligation assay, qRT-PCR for downstream targets, ex vivo CLL patient samples","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity ligation assay in patient-derived CLL cells, multiple signaling readouts, single lab","pmids":["31578228"],"is_preprint":false},{"year":2017,"finding":"Activated Notch1 (N1ICD) in endothelial cells induces cellular senescence and expression of chemokines and VCAM1, promoting neutrophil infiltration, tumor cell adhesion to the endothelium, and intravasation; treatment with Notch1-blocking antibodies or genetic ablation of EC Notch signaling inhibited these pro-metastatic events.","method":"Conditional N1ICD expression in ECs, Notch1-blocking antibody treatment, VCAM1 blockade, peritoneal ovarian carcinoma mouse model, lung colonization assays","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function transgenic EC model plus antibody blockade plus genetic ablation, multiple metastatic readouts, in vivo mouse models","pmids":["28238683"],"is_preprint":false},{"year":2014,"finding":"Notch1 heterozygosity in aortic valve interstitial cells produces a myofibroblast-like phenotype with higher cadherin-11 (regulated by Akt activity) and decreased Runx2; under cyclic strain, Notch1+/- AVICs show upregulated Akt phosphorylation and smooth muscle α-actin, leading to enhanced dystrophic (not osteogenic) calcific nodule formation.","method":"Murine immortalized Notch1+/- AVIC isolation, cyclic strain bioreactor, Akt inhibition, calcification nodule assays, molecular signaling pathway analysis","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic dissection in primary Notch1+/- cells with Akt inhibitor rescue and defined calcification readout, single lab","pmids":["26023079"],"is_preprint":false},{"year":2017,"finding":"NOTCH1 transactivates MYC in CLL via binding to B-cell-specific regulatory elements; active intracellular NOTCH1 (ICN1) is detectable in ~50% of peripheral blood CLL cases lacking NOTCH1 mutations and correlates with a NOTCH1 gene-expression signature enriched for B-cell proliferation and survival regulators.","method":"ICN1 protein detection, ChIP/reporter assays for MYC regulatory elements, gene expression signature analysis in primary CLL samples","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct demonstration of NOTCH1 binding to B-cell MYC regulatory elements with functional signature, single lab","pmids":["28314854"],"is_preprint":false},{"year":2008,"finding":"Hyperactivated PI3K/Akt signaling upregulates Notch1 through NF-κB activity, while hypoxia increases Notch1 mRNA and protein via HIF-1α stabilization; Notch1 is required for Akt and hypoxia to transform melanocytes and maintains cell proliferation and protects cells from stress-induced death in xenograft models.","method":"Human melanoma cell lines, xenograft model, PI3K/Akt inhibition, NF-κB inhibition, HIF-1α knockdown, Notch1 knockdown","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pathway-specific inhibitors plus Notch1 knockdown, in vivo xenograft, epistasis established, single lab","pmids":["18924608"],"is_preprint":false},{"year":2023,"finding":"Notch1 signaling in type II alveolar epithelial cells (AEC2s) determines cell fate by inhibiting differentiation (reducing lamellar body compartment and surfactant proprotein processing capacity) and causing increased epithelial proliferation, putatively via altered JAK/STAT signaling; Notch1 activity is already activated early in IPF, and pharmacological inhibition of Notch in IPF-derived lung slices improved surfactant processing and reversed fibrosis.","method":"Notch1 NICD overexpression in vivo, bleomycin fibrosis model, human IPF precision-cut lung slices with Notch inhibition, flow cytometry, kinome profiling, primary murine/human AEC2s","journal":"American journal of respiratory and critical care medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo overexpression and inhibition with functional differentiation readouts, human ex vivo validation, single lab","pmids":["36047984"],"is_preprint":false},{"year":2022,"finding":"NOTCH1 deficiency in human iPSC-derived cardiomyocytes blocks ventricular-like cardiomyocyte differentiation and promotes atrial-like cardiomyocyte generation through shortening of action potential duration; NOTCH1 KO leads to biased differentiation of cardiac mesoderm toward epicardial and second heart field progenitors at the expense of first heart field progenitors, and defective cardiomyocyte proliferation with downregulated cell cycle progression pathways.","method":"CRISPR/Cas9 NOTCH1 deletion in human iPSCs, single-cell RNA-seq at multiple differentiation time points, action potential duration measurement","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with single-cell transcriptomics and electrophysiology, multiple differentiation readouts, rigorous mechanistic dissection","pmids":["36583388"],"is_preprint":false},{"year":2022,"finding":"Optogenetic NOTCH1 receptor (optoNotch) allows ligand-independent light-controlled activation of N1ICD and downstream transcription; NOTCH1 activation increases proliferation in MCF7 and MDA-MB-468 breast cancer cells and induces chemoresistance, with cell-type-specific migratory phenotypes.","method":"Optogenetic receptor engineering (optoNotch), 2D and 3D spheroid cultures, transcriptional activity assays, chemoresistance assays","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — engineered optogenetic system for ligand-independent N1ICD control with functional readouts, single lab","pmids":["35585598"],"is_preprint":false},{"year":2021,"finding":"Reduced Notch1 cleavage in lung endothelial cells impairs endothelial barrier function and increases immune cell infiltration in vessel walls; Dll4-neutralizing antibodies inhibit Notch1 cleavage and induce pulmonary hypertension in mice, while overexpression of constitutively activated Notch1 attenuates pulmonary hypertension progression.","method":"Dll4-neutralizing antibody treatment in mice, Notch1 target gene array in human pulmonary microvascular ECs, constitutively activated Notch1 overexpression in vivo, PH mouse models, hemodynamic measurements","journal":"Hypertension (Dallas, Tex. : 1979)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic activation/inhibition in vivo with hemodynamic readouts and in vitro mechanistic studies, single lab","pmids":["34739767"],"is_preprint":false},{"year":2020,"finding":"PAK1 directly co-localizes and physically interacts with Notch1 in colon epithelial cells; silencing of PAK1 leads to Notch1 activation, and Notch1 activation abrogates the PAK1-Notch1 interaction, identifying a PAK1-Notch1 axis that regulates intestinal crypt homeostasis through Notch1-dependent HES1 and Lgr5 expression.","method":"Co-immunoprecipitation, immunofluorescence co-localization in intestinal organoids and cell lines, PAK1/Notch1 siRNA, IL10/PAK1 double-knockout mice","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and co-localization in organoids, in vivo double-KO mouse, single lab","pmids":["33189893"],"is_preprint":false},{"year":2015,"finding":"NOTCH1 gene transcription in keratinocytes is directly controlled by transcription factors DLX5 and EGR3 (required for RNA PolII recruitment to the NOTCH1 locus) and estrogen receptor β (ERβ, controlling NOTCH1 transcription through RNA PolII pause release); experimentally increased ERβ expression or ERβ agonist treatment promotes NOTCH1 expression and squamous differentiation in vitro and in mouse xenotransplants.","method":"Bioinformatics screening, ChIP (PolII occupancy), ERβ overexpression, ERβ agonist treatment, mouse xenotransplant model","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for PolII recruitment, functional ERβ gain-of-function in vitro and in vivo, single lab","pmids":["24743148"],"is_preprint":false},{"year":2017,"finding":"Notch1 inhibition in glioblastoma using CRISPR/Cas9-mediated ablation suppresses tumor growth, increases γH2AX foci (indicating impaired DNA repair), radiosensitizes GBM cells, impairs angiogenesis, and attenuates VEGF and hypoxic response to irradiation in xenografts.","method":"CRISPR/Cas9 Notch1 ablation, clonogenic assays, γH2AX immunofluorescence, xenograft tumor growth, immunofluorescence staining","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with radiosensitization and angiogenesis readouts in vivo, single lab","pmids":["29152141"],"is_preprint":false},{"year":2021,"finding":"Notch1 signaling in osteochondroprogenitor cells (overexpression of NICD1) during fracture healing increases periosteal cell proliferation and migration, expands αSMA-positive cells and their osteoblast progeny, reduces callus cartilage, increases mineralized callus, and improves bone biomechanical strength; conversely, anti-NRR1 antibody inhibition of Notch1 increases cartilage area and reduces callus bone mass.","method":"αSMACreERT2-Rosa-NICD1 transgenic mice, anti-NRR1 antibody treatment, fracture callus histology, biomechanical testing, in vitro proliferation/migration assays","journal":"Journal of orthopaedic research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic gain-of-function and antibody inhibition in vivo with cell-lineage tracing and biomechanical readouts, single lab","pmids":["32141629"],"is_preprint":false},{"year":2019,"finding":"Notch1 activation in renal tubular epithelial cells and fibroblasts contributes to TGF-β1/Smad2/3-dependent myofibroblastic phenotype; TGF-β1 induces Notch1 activity and these phenotypic transitions are abolished by Notch1 knockdown or DAPT, and exacerbated by Notch1 overexpression or Jagged-1-Fc activation.","method":"Notch1 siRNA, DAPT inhibitor, Jagged-1-Fc activator, fibroblast and TEC in vitro cultures, ureteral obstructive model in rats, CKD patient biopsies","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain and loss of function in vitro plus in vivo rat model with patient validation, single lab","pmids":["31718671"],"is_preprint":false},{"year":2015,"finding":"Lyso-Gb3 activates Notch1 signaling in human podocytes, increasing active Notch1 and HES1; Notch1 signaling activates NF-κB to mediate inflammatory chemokine (MCP-1, RANTES) upregulation, and promotes fibrogenic responses including fibronectin upregulation; these effects are abolished by Notch1 siRNA or γ-secretase inhibition.","method":"Notch1 siRNA, γ-secretase inhibitor, NFκB inhibitor (parthenolide), lyso-Gb3 treatment of cultured human podocytes, Fabry kidney biopsy immunostaining","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Notch1 siRNA with multiple downstream pathway readouts, human tissue validation, single lab","pmids":["26206887"],"is_preprint":false},{"year":2017,"finding":"Notch1 activation in fibroblasts (FSP-1;ROSA Notch1 gain-of-function mice) suppresses fibroblast growth, migration, and differentiation into myofibroblasts, delays wound healing, diminishes collagen deposition, and impairs angiogenic response; IL-6 was identified as a functional Notch1 target in fibroblasts involved in regulating angiogenesis.","method":"FSP-1-Cre;ROSA-NICD1 transgenic mouse wound healing model, in vitro fibroblast migration/differentiation assays, IL-6 functional validation","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain-of-function transgenic model with wound healing readouts and in vitro mechanistic follow-up, single lab","pmids":["33109684"],"is_preprint":false},{"year":2018,"finding":"Notch1 provides myocardial protection against ischemia-reperfusion injury by improving mitochondrial quality control: Notch1 overexpression increases ATP production, promotes mitochondrial fusion, decreases fission, and inhibits mitophagy by suppressing Pink1 expression and Mfn2/Parkin phosphorylation.","method":"Adenoviral Ad-N1ICD and Ad-shN1ICD in rat cardiomyocytes, ischemia-reperfusion injury model, mitophagy and mitochondrial dynamics assays, Pink1/Mfn2/Parkin pathway analysis","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — adenoviral gain/loss of function with mitochondrial functional readouts and pathway mechanistic analysis, single lab","pmids":["30515819"],"is_preprint":false},{"year":2016,"finding":"Notch1 (NICD) regulates the aggressiveness of differentiated thyroid cancer (DTC) by suppressing SERPINE1 (PAI-1): NICD induction reduces SERPINE1 expression in a dose-dependent manner and inhibits DTC cell growth and migration in vitro and in an orthotopic xenograft model.","method":"Doxycycline-inducible NICD expression system, microarray target discovery, SERPINE1 knockdown, orthotopic thyroid cancer xenograft","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inducible gain-of-function with microarray target validation and in vivo xenograft, single lab","pmids":["26847059"],"is_preprint":false},{"year":2015,"finding":"Notch1 heterozygous loss is sufficient to cause ascending aortic aneurysm in 129S6 background mice; conditional heterozygous deletion of Notch1 in the second heart field (SHF) lineage recapitulates exacerbated aortic root dilation, establishing an SHF lineage-specific role for Notch1 in ascending aortic aneurysm.","method":"Notch1 heterozygous mice (129S6 background), SHF lineage-specific Notch1 conditional deletion, Marfan syndrome mouse model crossbreeding, RNA sequencing of aortic root","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vivo mouse genetic models with anatomical and transcriptomic readouts, single lab","pmids":["29093270"],"is_preprint":false},{"year":2017,"finding":"Notch1 is required for intermittent hypoxia (IH)-enhanced hippocampal neurogenesis in vivo; IH activates Notch1 signaling in wild-type mice, and Notch1 heterozygous (N+/-) mice fail to upregulate Notch1 activity after IH and show blocked IH-enhanced NSC proliferation, newborn neuron survival/migration, and spine morphogenesis.","method":"Notch1 heterozygous mice, intermittent hypoxia protocol, BrdU incorporation, immunohistochemistry for neurogenesis markers","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with Notch1 heterozygous mice and hypoxia protocol, multiple neurogenesis readouts, single lab","pmids":["24368168"],"is_preprint":false},{"year":2021,"finding":"Cardiac-specific Notch1 deletion causes multiple structural cardiac defects and embryonic lethality; Notch1 is expressed and activated in the myocardium at multiple stages; Notch1 or RBPJk deletion in NFP double-knockout (MDKO) mice partially rescues defects in cardiac progenitor cell differentiation, cardiomyocyte proliferation, and trabecular morphogenesis but not structural defects, indicating NFPs regulate cardiac development through both Notch1-dependent and Notch1-independent mechanisms.","method":"Cardiac-specific Notch1 and RBPJk knockout mice, Notch reporter lines, RNAScope, Numb/Numbl/Notch1/RBPJk triple knockout, phenotype comparison","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vivo genetic epistasis mouse models with embryonic cardiac phenotype readouts, single lab","pmids":["34571841"],"is_preprint":false}],"current_model":"NOTCH1 is a transmembrane mechanosensitive receptor that is activated by DSL ligands (DLL1/4, JAG1/2) through ligand-endocytosis-dependent conformational changes and sequential proteolytic cleavages (including by γ-secretase/presenilin), releasing the intracellular domain (NICD/N1ICD) that translocates to the nucleus to form a transcriptional activating complex with RBPJk and MAML; NICD activity is positively regulated by p300-mediated acetylation (extending half-life) and negatively regulated by FBW7-mediated phosphorylation-dependent proteasomal degradation, c-Cbl-mediated monoubiquitination/lysosomal degradation (downstream of PI3K/AKT suppression), USP10-mediated deubiquitination (stabilization disrupted by N1DARP), SIRT1-mediated deacetylation, and Src kinase-mediated phosphorylation (impairing MAML recruitment); RFC4 stabilizes NICD by competing with CDK8/FBXW7-dependent degradation; GSK3β controls Notch1 postendocytic recycling to modulate surface receptor levels; NOTCH1 integrates extracellular signals including shear stress (acting as a vascular mechanosensor), O-fucosylation by Fringe enzymes (modulating ligand specificity), and cross-talk with TGF-β/Smad3, PI3K/Akt, NF-κB, HIF-1α, BTK, PAK1, and p53 pathways; its downstream transcriptional targets include HES1, MYC, SERPINE1, VE-cadherin (via SNAI1/ERG repression), and IL-6, governing cell fate decisions in T-cell development, vascular homeostasis, cardiac morphogenesis, podocyte function, and epithelial differentiation, with context-dependent oncogenic or tumor-suppressive roles."},"narrative":{"mechanistic_narrative":"NOTCH1 is a ligand-activated transmembrane receptor whose released intracellular domain (NICD/N1ICD) drives a transcriptional program governing cell-fate decisions across vascular, cardiac, immune, renal, and epithelial tissues [PMID:29158473, PMID:26062937, PMID:36583388]. Signaling initiates when DSL ligands such as DLL4 engage the receptor and trigger clathrin/dynamin-dependent endocytosis of NOTCH1 into SARA-positive endosomes, a step coupled to ligand transendocytosis and required for productive signal transduction [PMID:26522918]; receptor competence is tuned by O-fucosylation of specific EGF repeats, which controls Lunatic Fringe-mediated potentiation of DLL1-NOTCH1 activation and receptor trafficking [PMID:32820046], and by GSK3β-controlled postendocytic recycling that sets surface receptor levels [PMID:29237816]. Signal output is determined by the number of NICD molecules reaching the nucleus and the duration of the NICD-RBPJk-MAML-DNA complex, with tissue-specific γ-secretase cleavage choices tuning NICD stability [PMID:26062937]. NICD abundance and activity are extensively post-translationally controlled: p300-dependent acetylation extends N1ICD half-life while SIRT1 deacetylates and destabilizes it [PMID:29186476, PMID:38017499]; FBW7/FBXW7 mediates phosphorylation-dependent nuclear degradation [PMID:25955618]; c-Cbl monoubiquitinates NOTCH1 for lysosomal degradation upon PI3K/AKT withdrawal [PMID:26052821]; the microprotein N1DARP displaces the deubiquitinase USP10 to promote K11/K48 polyubiquitination and proteasomal turnover [PMID:37714834]; RFC4 stabilizes NICD1 by blocking CDK8/FBXW7-dependent degradation in a feed-forward loop [PMID:33976158]; and c-Src phosphorylates NICD to reduce MAML recruitment and transcriptional output [PMID:30341382]. Nuclear NICD transactivates targets including HES1, MYC, SERPINE1, and IL-6 and represses VE-cadherin via SNAI1 and ERG [PMID:33435713, PMID:28314854, PMID:26847059, PMID:33109684]. In endothelium, NOTCH1 functions as a shear-stress mechanosensor that maintains junctional integrity and suppresses proliferation and inflammation, with loss promoting atherosclerosis and metastatic endothelial activation [PMID:26552708, PMID:29158473, PMID:28238683]. Context-dependent roles span ventricular cardiomyocyte specification and proliferation [PMID:36583388, PMID:29186476], aortic and cardiac morphogenesis [PMID:29093270, PMID:34571841], podocyte injury in diabetic and Fabry kidney disease [PMID:26293507, PMID:26206887], and oncogenic signaling integrated with PI3K/Akt, NF-κB, HIF-1α, and TGF-β/Smad3 pathways [PMID:18924608, PMID:18292500].","teleology":[{"year":2004,"claim":"Established an upstream brake on NOTCH1 activation during T-cell development by linking p53 to the proteolytic machinery that releases NICD.","evidence":"Trp53-/- mouse thymocytes with NIC detection and CD4/CD8 flow cytometry, mapping p53 repression of Presenilin1","pmids":["14991602"],"confidence":"Medium","gaps":["Does not establish direct p53 binding to the PS1 promoter","Effect on other tissues not tested"]},{"year":2008,"claim":"Defined how NOTCH1 abundance is driven by oncogenic and hypoxic inputs, showing PI3K/Akt-NF-κB and HIF-1α converge to upregulate Notch1 and make it required for transformation.","evidence":"Melanoma cell lines and xenografts with pathway-specific inhibitors and Notch1 knockdown; plus Co-IP linking N1ICD to phospho-Smad3 in dendritic cells","pmids":["18924608","18292500"],"confidence":"Medium","gaps":["Direct transcription-factor occupancy on the NOTCH1 locus not shown in melanoma context","Smad3 interaction surface on NICD not mapped"]},{"year":2011,"claim":"Identified a receptor tyrosine kinase, DDR1, as a physical NOTCH1 partner that links collagen sensing to canonical Notch target activation.","evidence":"Tandem affinity purification, Co-IP, nuclear fractionation and DDR1 knockdown with γ-secretase inhibitor","pmids":["21398698"],"confidence":"Medium","gaps":["Mechanism by which DDR1 activates Notch cleavage unresolved","Single-lab interaction without structural detail"]},{"year":2015,"claim":"Resolved that NOTCH1/NOTCH2 functional divergence is encoded by signal strength and NICD complex duration rather than intrinsic ICD differences, with γ-secretase cleavage choice tuning stability.","evidence":"Intracellular domain swap mouse model with genetic epistasis across multiple tissues","pmids":["26062937"],"confidence":"High","gaps":["Molecular basis of tissue-specific scissile bond choice not defined","Does not map cofactors setting complex half-life"]},{"year":2015,"claim":"Built the degradation arm of NICD regulation, defining FBW7-mediated nuclear degradation and PI3K/AKT-gated c-Cbl monoubiquitination/lysosomal turnover.","evidence":"siRNA/overexpression with migration assays in HCC; ubiquitin capture and Co-IP in cells with PI3K inhibition and dominant-negative AKT","pmids":["25955618","26052821"],"confidence":"Medium","gaps":["Phosphodegron residues recognized by FBW7 not directly mapped here","c-Cbl ubiquitination site not defined"]},{"year":2015,"claim":"Established the transcriptional control of the NOTCH1 gene itself in keratinocytes, identifying DLX5/EGR3 and ERβ as regulators of PolII recruitment and pause release.","evidence":"Bioinformatic screen, ChIP for PolII occupancy, ERβ gain-of-function in vitro and in xenotransplants","pmids":["24743148"],"confidence":"Medium","gaps":["Generality beyond squamous keratinocytes untested","Direct DLX5/EGR3 binding sites not mapped"]},{"year":2015,"claim":"Defined NOTCH1 as a protective, anti-inflammatory regulator of endothelium suppressed by inflammatory lipids/cytokines via STAT3, with loss promoting atherosclerosis.","evidence":"siRNA in human aortic ECs, monocyte adhesion assays, Notch1 heterozygous atherosclerosis mouse model","pmids":["26552708"],"confidence":"High","gaps":["Direct STAT3 action on the NOTCH1 locus not shown","Downstream effectors of EC inflammation incompletely defined"]},{"year":2017,"claim":"Demonstrated that ligand-induced NOTCH1 endocytosis into SARA endosomes is required for signaling, and that GSK3β-controlled recycling tunes surface receptor levels.","evidence":"Live-cell imaging with clathrin/dynamin inhibition and ligand co-culture; GSK3β inhibition with recycling and NICD production assays","pmids":["26522918","29237816"],"confidence":"High","gaps":["Adaptors coupling NOTCH1 to clathrin not identified","GSK3β substrate residue on Notch1 unmapped"]},{"year":2017,"claim":"Established NOTCH1 as a vascular mechanosensor, scaling signaling to shear stress to maintain junctional integrity and suppress proliferation through calcium signaling.","evidence":"Shear stress assays, siRNA knockdown, calcium rescue, adult endothelial Notch1-knockout atherosclerosis mouse model","pmids":["29158473"],"confidence":"High","gaps":["The force-transducing element of NOTCH1 not structurally defined","Link between flow sensing and proteolytic activation unresolved"]},{"year":2017,"claim":"Expanded NOTCH1 partner biology to cytoskeletal and adhesion contexts, identifying keratin 8/18 as stabilizers in colonocytes and MEGF10 as a disease-relevant ICD partner.","evidence":"PLA and reciprocal Co-IP with knockout/rescue (K8/K18); reciprocal Co-IP with pathogenic MEGF10 mutation disruption","pmids":["28475172","28498977"],"confidence":"Medium","gaps":["How keratins stabilize Notch1 protein not mechanistically resolved","MEGF10-Notch1 interaction interface not mapped"]},{"year":2017,"claim":"Showed activated endothelial NOTCH1 (N1ICD) is pro-metastatic, inducing senescence, chemokines and VCAM1 to drive tumor-cell adhesion and intravasation.","evidence":"Conditional N1ICD EC expression, Notch1-blocking antibody, VCAM1 blockade, ovarian carcinoma and lung colonization mouse models","pmids":["28238683"],"confidence":"High","gaps":["Transcriptional targets driving SASP not fully enumerated","Context distinguishing protective vs pro-metastatic EC Notch1 unclear"]},{"year":2017,"claim":"Defined tissue-specific transcriptional outputs of NOTCH1 in tumor and fibroblast contexts, including MYC transactivation in CLL and IL-6-dependent angiogenic suppression in fibroblasts.","evidence":"ICN1 detection and ChIP/reporter on B-cell MYC elements in primary CLL; FSP-1-Cre;ROSA-NICD1 wound-healing mice with IL-6 validation; CRISPR Notch1 ablation radiosensitizing GBM","pmids":["28314854","33109684","29152141"],"confidence":"Medium","gaps":["Opposing growth effects across cell types mechanistically unreconciled","Direct vs indirect target status of IL-6 not fully resolved"]},{"year":2018,"claim":"Established acetylation as a positive NICD stability switch and phosphorylation by c-Src as a negative one, coupling kinase signaling to transcriptional output.","evidence":"Acetylation assays and SIRT1 gain/loss with in vivo cardiac regeneration; Co-IP, in vitro kinase assay and mutagenesis with reporter (Src)","pmids":["29186476","30341382"],"confidence":"High","gaps":["Acetylated lysines on N1ICD not enumerated","Crosstalk between Src phosphorylation and FBW7/Cbl pathways untested"]},{"year":2019,"claim":"Extended NOTCH1 regulation to cell-cycle and B-cell signaling kinases, identifying PLK1 control at G2/M and DNA damage and a BTK-NICD axis transmitting BCR signals in CLL.","evidence":"Kinase screen plus Co-IP and cell-cycle analysis (PLK1); PLA and qRT-PCR of targets in CLL patient samples with ibrutinib (BTK)","pmids":["31597699","31578228"],"confidence":"Medium","gaps":["Whether PLK1 directly phosphorylates Notch1 not established","BTK-NICD interaction interface and direct phosphorylation not defined"]},{"year":2020,"claim":"Defined the glycosylation logic of NOTCH1 ligand selectivity and trafficking, mapping specific O-fucose sites required for Fringe-mediated DLL1 potentiation; and identified a PAK1-Notch1 axis controlling crypt homeostasis.","evidence":"Cell-based signaling/binding assays with mass spectrometry and EGF O-fucose site mutants; Co-IP and co-localization in organoids with PAK1/Notch1 perturbation and double-KO mice","pmids":["32820046","33189893"],"confidence":"High","gaps":["Structural basis of Fringe-modified ligand discrimination not solved","How PAK1 binding restrains Notch1 activation unresolved"]},{"year":2021,"claim":"Defined transcriptional and physiological consequences of endothelial NOTCH1, repressing VE-cadherin via SNAI1/ERG and cooperating with pericyte NOTCH3 to stabilize vasculature.","evidence":"VE-cadherin promoter dissection with TF knockdown and transgenic NICD1 mice (albuminuria); vascular co-culture with NOTCH1/NOTCH3 siRNA and DLL4 ligand identification; Dll4-neutralization PH model","pmids":["33435713","34878922","34739767"],"confidence":"High","gaps":["Threshold distinguishing protective vs barrier-disrupting Notch1 unclear","Reconciliation of junction stabilization with VE-cadherin repression incomplete"]},{"year":2021,"claim":"Established a stabilizing feed-forward loop (RFC4 protecting NICD1 from CDK8/FBXW7 degradation) and cell-type-specific pathological roles in podocytes, fibrosis, and bone.","evidence":"Reciprocal Co-IP and degradation assays with target validation in NSCLC; podocyte-specific Notch1 conditional KO diabetic mice; αSMACreERT2 NICD1 fracture model with anti-NRR1 antibody","pmids":["33976158","26293507","32141629"],"confidence":"High","gaps":["Generality of RFC4 loop beyond NSCLC untested","Compensatory Notch2 upregulation complicates Notch1-specific interpretation"]},{"year":2022,"claim":"Used engineered and genetic systems to causally dissect NOTCH1's role in cardiomyocyte fate and proliferation and in ligand-independent oncogenic activation.","evidence":"CRISPR NOTCH1 KO in human iPSC-cardiomyocytes with scRNA-seq and electrophysiology; optogenetic optoNotch ligand-independent N1ICD control in breast cancer cells","pmids":["36583388","35585598"],"confidence":"High","gaps":["Effector genes driving ventricular vs atrial fate choice incompletely mapped","optoNotch in vivo relevance untested"]},{"year":2023,"claim":"Defined ubiquitin-pathway control of NICD by the USP10 deubiquitinase (disruptable by the microprotein N1DARP) and SIRT1-driven deacetylation/degradation, and a fate-controlling role in alveolar epithelium.","evidence":"Co-IP, ubiquitination assays and stapled-peptide functional studies in pancreatic cancer (N1DARP/USP10); PLA and in vivo heart-failure model (SIRT1); in vivo and ex vivo IPF lung slices with Notch inhibition","pmids":["37714834","38017499","36047984"],"confidence":"Medium","gaps":["Endogenous role of N1DARP microprotein beyond cancer unclear","JAK/STAT linkage in AEC2s remains putative"]},{"year":null,"claim":"How the diverse post-translational regulators (acetylation, multiple ubiquitin ligases/DUBs, tyrosine kinases) are integrated to set NICD dose and duration in a given cell type, and what determines NOTCH1's context-dependent oncogenic versus tumor-suppressive output, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified quantitative model of competing NICD stabilizers and degraders","Determinants of tissue-specific protective vs pathogenic Notch1 outcomes undefined","Structural basis of mechanosensing and ligand-dependent cleavage not resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[16,25,39,5]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,15,13]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[15]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,9,15]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,10,22]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,15,18]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[28,42,18]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,6,7,5,2]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[21,36,40,23]}],"complexes":["NICD-RBPJk-MAML transcriptional activation complex"],"partners":["RBPJ","MAML","USP10","FBXW7","RFC4","SIRT1","DDR1","BTK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P46531","full_name":"Neurogenic locus notch homolog protein 1","aliases":["Translocation-associated notch protein TAN-1"],"length_aa":2555,"mass_kda":272.5,"function":"Functions as a receptor for membrane-bound ligands Jagged-1 (JAG1), Jagged-2 (JAG2) and Delta-1 (DLL1) 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. Involved in angiogenesis; negatively regulates endothelial cell proliferation and migration and angiogenic sprouting. Involved in the maturation of both CD4(+) and CD8(+) cells in the thymus. Important for follicular differentiation and possibly cell fate selection within the follicle. During cerebellar development, functions as a receptor for neuronal DNER and is involved in the differentiation of Bergmann glia. Represses neuronal and myogenic differentiation. May play an essential role in postimplantation development, probably in some aspect of cell specification and/or differentiation. May be involved in mesoderm development, somite formation and neurogenesis. May enhance HIF1A function by sequestering HIF1AN away from HIF1A. Required for the THBS4 function in regulating protective astrogenesis from the subventricular zone (SVZ) niche after injury. Involved in determination of left/right symmetry by modulating the balance between motile and immotile (sensory) cilia at the left-right organiser (LRO)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P46531/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NOTCH1","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NOTCH1","total_profiled":1310},"omim":[{"mim_id":"621120","title":"DELTA-LIKE NONCANONICAL NOTCH LIGAND 2; DLK2","url":"https://www.omim.org/entry/621120"},{"mim_id":"620696","title":"RBPJ-INTERACTING AND TUBULIN-ASSOCIATED PROTEIN 1; RITA1","url":"https://www.omim.org/entry/620696"},{"mim_id":"619768","title":"ARRESTIN DOMAIN-CONTAINING PROTEIN 1; ARRDC1","url":"https://www.omim.org/entry/619768"},{"mim_id":"619530","title":"SOLUTE CARRIER FAMILY 35, MEMBER C2; SLC35C2","url":"https://www.omim.org/entry/619530"},{"mim_id":"618503","title":"PROTEIN O-GLUCOSYLTRANSFERASE 3; POGLUT3","url":"https://www.omim.org/entry/618503"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NOTCH1"},"hgnc":{"alias_symbol":[],"prev_symbol":["TAN1"]},"alphafold":{"accession":"P46531","domains":[{"cath_id":"2.10.25.10","chopping":"224-259","consensus_level":"medium","plddt":64.0892,"start":224,"end":259},{"cath_id":"2.10.25.10","chopping":"532-567","consensus_level":"high","plddt":61.9683,"start":532,"end":567},{"cath_id":"2.10.25.10","chopping":"830-878","consensus_level":"medium","plddt":61.3045,"start":830,"end":878},{"cath_id":"2.10.25.10","chopping":"895-947","consensus_level":"medium","plddt":60.6615,"start":895,"end":947},{"cath_id":"2.10.25.10","chopping":"989-1020","consensus_level":"medium","plddt":61.3663,"start":989,"end":1020},{"cath_id":"-","chopping":"1076-1121_1140-1145","consensus_level":"medium","plddt":65.0979,"start":1076,"end":1145}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P46531","model_url":"https://alphafold.ebi.ac.uk/files/AF-P46531-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P46531-F1-predicted_aligned_error_v6.png","plddt_mean":59.59},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NOTCH1","jax_strain_url":"https://www.jax.org/strain/search?query=NOTCH1"},"sequence":{"accession":"P46531","fasta_url":"https://rest.uniprot.org/uniprotkb/P46531.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P46531/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P46531"}},"corpus_meta":[{"pmid":"24662767","id":"PMC_24662767","title":"NOTCH1 mutations occur early during cutaneous squamous cell carcinogenesis.","date":"2014","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/24662767","citation_count":282,"is_preprint":false},{"pmid":"28238683","id":"PMC_28238683","title":"Endothelial Notch1 Activity Facilitates Metastasis.","date":"2017","source":"Cancer cell","url":"https://pubmed.ncbi.nlm.nih.gov/28238683","citation_count":250,"is_preprint":false},{"pmid":"29158473","id":"PMC_29158473","title":"NOTCH1 is a mechanosensor in adult arteries.","date":"2017","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/29158473","citation_count":248,"is_preprint":false},{"pmid":"18924608","id":"PMC_18924608","title":"Notch1 is an effector of Akt and hypoxia in melanoma development.","date":"2008","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/18924608","citation_count":170,"is_preprint":false},{"pmid":"20008221","id":"PMC_20008221","title":"The role of NOTCH1 signaling in T-ALL.","date":"2009","source":"Hematology. 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signal transduction; inhibition of clathrin- and dynamin-dependent endocytosis in the receptor-expressing cell impairs ligand-induced Notch1 signaling, and Notch1 endocytosis is accompanied by transendocytosis of ligand into the signal-receiving cell.\",\n      \"method\": \"Live-cell imaging, clathrin/dynamin inhibition, ligand-expressing co-culture\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell imaging with functional inhibition of endocytosis, multiple orthogonal approaches in one study resolving conflicting prior reports\",\n      \"pmids\": [\"26522918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"c-Src kinase physically interacts with the Notch1 intracellular domain (NICD), directly phosphorylates it at specific tyrosine residues downstream of β3 integrin/MAGP2 signaling, and this phosphorylation attenuates Notch1-mediated transcription by decreasing MAML recruitment to the co-transcriptional complex and reducing NICD half-life.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis, transcriptional reporter assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct phosphorylation demonstrated in vitro with mutagenesis of phosphorylation sites and functional transcriptional readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"30341382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The Notch1 intracellular domain (N1ICD) is reversibly acetylated in proliferating neonatal cardiomyocytes; acetylation extends N1ICD half-life and enhances its transcriptional activity to sustain cardiomyocyte proliferation and counteract apoptosis, while SIRT1 acts as a deacetylase that reverses N1ICD acetylation and dampens its stability.\",\n      \"method\": \"Acetylation assays, SIRT1 overexpression, constitutively acetylated N1ICD-p300 fusion protein, adeno-associated viral vector delivery, neonatal mouse apical resection model\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — biochemical acetylation assays, gain/loss of function, in vivo regeneration model, multiple orthogonal methods in one study\",\n      \"pmids\": [\"29186476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SIRT1 deacetylates and promotes degradation of the active Notch1 intracellular domain (NICD); mechanistically, dapagliflozin reduces SIRT1 phosphorylation (preventing its ubiquitination/degradation), enabling nuclear SIRT1 translocation and binding to NICD, leading to NICD deacetylation, degradation, and inactivation of Notch1 signaling, thereby attenuating endothelial-mesenchymal transition.\",\n      \"method\": \"Western blotting, confocal proximity ligation assay, in vivo heart failure model, in vitro HUVEC/MAEC assays, SIRT1 inhibition experiments\",\n      \"journal\": \"Cardiovascular diabetology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity ligation and co-IP showing SIRT1-NICD interaction, in vivo and in vitro validation, single lab\",\n      \"pmids\": [\"38017499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The microprotein N1DARP competitively disrupts the interaction between N1ICD and the deubiquitinase USP10, thereby promoting K11- and K48-linked polyubiquitination of N1ICD and its proteasome-mediated degradation, suppressing canonical and non-canonical Notch1 signaling in pancreatic cancer.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, N1DARP knockout in organoids and KPC mice, cell-penetrating stapled peptide functional studies\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — biochemical dissection of USP10-N1ICD interaction, ubiquitination assays, in vivo organoid and mouse models, multiple orthogonal methods\",\n      \"pmids\": [\"37714834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RFC4 directly binds to the Notch1 intracellular domain (NICD1) and competitively abrogates CDK8/FBXW7-mediated degradation of NICD1, thereby stabilizing it; RFC4 is itself a transcriptional target of Notch1 signaling, forming a positive feedback loop that sustains NICD1 overactivation in NSCLC.\",\n      \"method\": \"Co-immunoprecipitation, pulldown, ubiquitination/degradation assays, transcriptional target validation, NSCLC cell lines and patient datasets\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, mechanistic degradation assay, feedback loop confirmed by multiple methods, single lab\",\n      \"pmids\": [\"33976158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PI3K/AKT signaling inhibits lysosomal degradation of NOTCH1; withdrawal of PI3K/AKT activity leads to NOTCH1 tyrosine phosphorylation, monoubiquitination by the E3 ligase c-Cbl (shown by co-immunoprecipitation), and subsequent lysosomal degradation of NOTCH1 protein.\",\n      \"method\": \"PI3K inhibitor treatment, dominant-negative AKT transfection, ubiquitin capture assay, co-immunoprecipitation, colocalization analysis\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ubiquitin capture assay demonstrating c-Cbl/NOTCH1 interaction, multiple functional methods, single lab\",\n      \"pmids\": [\"26052821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FBW7 (FBXW7) E3 ubiquitin ligase mediates phosphorylation-dependent degradation of the Notch1 intracellular domain in the nucleus; loss of FBXW7 in hepatocellular carcinoma increases NICD levels and promotes cell migration and invasion via Notch1 downstream molecules.\",\n      \"method\": \"siRNA knockdown, Fbxw7 overexpression, migration/invasion assays, Western blot, tissue microarray\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional assays in cell lines with Fbxw7 knockdown/overexpression, established FBXW7-Notch1 degradation axis, single lab\",\n      \"pmids\": [\"25955618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PLK1 interacts with NOTCH1 and regulates NOTCH1 expression at the G2/M transition; during DNA damage, PLK1 activity is inhibited, NOTCH1 expression is maintained, and arsenite-induced genotoxic stress causes a PLK1-dependent signaling response that antagonizes NOTCH1's role in the DNA damage checkpoint.\",\n      \"method\": \"Chemical library kinase screen, co-immunoprecipitation, cell cycle analysis, PLK1 inhibition, DNA damage assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase screen followed by co-IP and cell-cycle-coupled functional validation, single lab\",\n      \"pmids\": [\"31597699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GSK3β regulates Notch1 signaling by controlling postendocytic receptor recycling; GSK3β inhibition increases Notch1 cell surface levels, elevates NICD production and signaling activity, and alters Notch1 localization within a tubulovesicular compartment.\",\n      \"method\": \"GSK3β inhibition, immunolocalization, Notch1 transport/recycling assays, NICD production measurement\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor recycling and localization assays with functional signaling readout, single lab, multiple methods\",\n      \"pmids\": [\"29237816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DDR1 receptor tyrosine kinase physically interacts with Notch1 (identified by tandem affinity protein purification); upon ligand-mediated DDR1 activation, Notch1 is activated and bound to DDR1, activating canonical Notch1 targets (Hes1, Hey2), and DDR1 knockdown abolishes collagen I-induced nuclear accumulation of active Notch1.\",\n      \"method\": \"Tandem affinity protein purification, co-immunoprecipitation, nuclear fractionation, DDR1 knockdown, gamma-secretase inhibitor treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tandem affinity purification and co-IP for interaction, nuclear fractionation for functional consequence, single lab\",\n      \"pmids\": [\"21398698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Notch1 intracellular domain physically interacts with phospho-Smad3 (pSmad3) in dendritic cells; overexpression of N1ICD facilitates pSmad3 nuclear translocation and enhances pSmad3 transcriptional activity on Smad-sensitive promoters, mechanistically linking Notch1 signaling to TGF-β-mediated Treg effector function.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay, antibody blockade of Notch1/Jagged1, in vitro Treg suppression assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of N1ICD with pSmad3, reporter assay for transcriptional activity, functional Treg suppression readout, single lab\",\n      \"pmids\": [\"18292500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Keratin 8 (K8) and its partner K18 physically interact with Notch1 receptor (shown by proximity ligation assay and co-immunoprecipitation in colonocytes); K8/K18 enhance Notch1 protein levels and activity in a dose-dependent manner, and K8 loss reduces full-length Notch1, NICD, and downstream target gene expression, shifting colonic differentiation toward goblet cell and enteroendocrine fates.\",\n      \"method\": \"Proximity ligation assay, co-immunoprecipitation, K8-knockout mice, CRISPR/Cas9 Caco-2 knockout, K8/K18 re-expression rescue\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus proximity ligation, in vivo knockout, in vitro CRISPR rescue, multiple orthogonal methods\",\n      \"pmids\": [\"28475172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Fringe enzymes and canonical Notch ligands differentially regulate NOTCH1 vs. NOTCH2; DLL4 activates NOTCH1 more than twice as potently as NOTCH2 in the absence of Fringes; O-fucosylation on EGF8 and EGF12 of NOTCH1 is required for Lunatic Fringe-mediated enhancement of DLL1-NOTCH1 activation, and O-fucosylation on EGF9 is important for receptor trafficking of both NOTCH1 and NOTCH2.\",\n      \"method\": \"Cell-based Notch signaling and ligand-binding assays, mass spectrometry for O-fucose, Fringe enzyme mutagenesis, EGF domain O-fucose site mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cell-based functional assays combined with mass spectral glycan analysis and site-directed mutagenesis, multiple orthogonal approaches in one rigorous study\",\n      \"pmids\": [\"32820046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Endothelial NOTCH1 is suppressed by inflammatory lipids (Ox-PAPC) and cytokines (TNF, IL-1β) through a STAT3-dependent mechanism; siRNA-mediated reduction of NOTCH1 in human aortic endothelial cells increases inflammatory molecules and monocyte binding in the absence of inflammatory stimulus, and endothelial Notch1 heterozygous mice show higher diet-induced atherosclerosis.\",\n      \"method\": \"siRNA knockdown, inflammatory lipid treatment, monocyte adhesion assay, Notch1 heterozygous mouse atherosclerosis model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA functional studies in human ECs plus in vivo mouse atherosclerosis model, STAT3-dependent mechanism identified, multiple orthogonal methods\",\n      \"pmids\": [\"26552708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Endothelial NOTCH1 functions as a mechanosensor: NOTCH1 localizes downstream of flow and canonical NOTCH signaling scales with the magnitude of fluid shear stress; NOTCH1 is required for maintenance of junctional integrity and suppression of proliferation under laminar shear stress, and loss of NOTCH1 destabilizes junctions and triggers proliferation through changes in intracellular calcium signaling.\",\n      \"method\": \"Shear stress assays, siRNA knockdown, live imaging, gene expression profiling, calcium signaling rescue experiments, adult endothelial Notch1-knockout mouse atherosclerosis model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanosensing functional assays with NOTCH1 KD, calcium rescue experiments, in vivo mouse model with atherosclerosis readout, multiple labs replicating parts\",\n      \"pmids\": [\"29158473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Endothelial NOTCH1 activation suppresses VE-cadherin expression through the transcription factors SNAI1 (binding -373 E-box) and ERG (binding -134/-118 ETS element) on the VE-cadherin promoter; constitutive endothelial NICD1 expression in mice induces severe albuminuria associated with decreased VE-cadherin and reduced glomerular endothelial glycocalyx.\",\n      \"method\": \"NICD1 lentiviral infection, DLL4 treatment, VE-cadherin promoter analysis, transgenic mouse model (ZEG-NICD1/Tie2-tTA/Tet-O-Cre), SNAI1/ERG knockdown, monolayer permeability assay\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic model plus mechanistic promoter dissection with transcription factor knockdown, multiple orthogonal methods\",\n      \"pmids\": [\"33435713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MEGF10 interacts with Notch1 via their respective intracellular domains (shown by reciprocal co-immunoprecipitation); the pathogenic MEGF10 p.C774R mutation impairs this interaction, and MEGF10 regulation of myoblast proliferation and migration is mediated at least in part through Notch1 signaling.\",\n      \"method\": \"Reciprocal co-immunoprecipitation, shRNA knockdown, pathogenic mutation overexpression, Megf10-/- mouse myoblast proliferation/migration assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP for interaction, pathogenic mutation disruption, cell functional assays, single lab\",\n      \"pmids\": [\"28498977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In the intracellular domain swap mouse model, differences between Notch1 and Notch2 outcomes reflect signal strength (number of NICD molecules reaching the nucleus, integrating ligand-mediated release and nuclear translocation) and duration (half-life of NICD-RBPJk-MAML-DNA complexes); tissue-specific NICD stability differences are caused by alternative scissile bond choices by tissue-specific γ-secretase complexes.\",\n      \"method\": \"Intracellular domain swap mouse model, genetic epistasis across multiple tissues (T-cell development, skin, inner ear, lung, retina), gamma-secretase complex analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic in vivo genetic epistasis across multiple tissues with ICD-swap mouse model, mechanistic dissection of signal strength and duration\",\n      \"pmids\": [\"26062937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"p53 negatively regulates Notch1 activation during T-cell development through Presenilin1 (PS1): p53 represses PS1 expression, and PS1 cleaves Notch1 to release the NIC; Trp53-/- thymocytes show elevated NIC levels and altered CD4+/CD8+ T-cell ratios consistent with increased Notch1 activation, phenocopying NIC-overexpressing mice.\",\n      \"method\": \"Thymoma cell lines, Trp53-/- mouse thymocytes, NIC protein detection, flow cytometry for CD4/CD8 populations\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with p53-null mouse thymocytes, functional T-cell development readout, single lab\",\n      \"pmids\": [\"14991602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Pericyte NOTCH3 and endothelial NOTCH1 cooperate for pericyte-induced vascular stabilization: DLL4 expression in pericytes is dependent on NOTCH3, and DLL4 is the key ligand activating endothelial NOTCH1; loss of either NOTCH3 or NOTCH1 decreases VE-cadherin accumulation at adherens junctions and increases junction motility in vitro.\",\n      \"method\": \"In vitro vascular co-culture models, siRNA knockdown of NOTCH1 and NOTCH3, VE-cadherin imaging, DLL4 ligand identification\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional co-culture model with siRNA knockdown and specific ligand identification, single lab\",\n      \"pmids\": [\"34878922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Notch1 activation in podocytes drives diabetic kidney disease: conditional deletion of Notch1 (but not Notch2) in podocytes markedly ameliorates albuminuria and mesangial expansion in diabetic mice; Notch1-null podocytes are protected from apoptosis and dedifferentiation in vitro; deletion of Notch1 leads to compensatory upregulation of Notch2.\",\n      \"method\": \"NPHS2(cre)Notch1(flox/flox) conditional knockout mice, diabetic nephropathy model, in vitro podocyte apoptosis/dedifferentiation assays, Notch2 transgenic overexpression\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific conditional knockout with defined disease phenotype, in vitro mechanistic follow-up, receptor-specific comparison, single lab\",\n      \"pmids\": [\"26293507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NOTCH1-ICD physically interacts with BTK (demonstrated by in situ proximity ligation assay); BCR stimulation increases nuclear NOTCH1-ICD and activates HES1, DTX1, and c-MYC transcription; ibrutinib (BTK inhibitor) disrupts NOTCH1-ICD/BTK complexes and reduces NOTCH1 activation in CLL.\",\n      \"method\": \"Western blotting, confocal proximity ligation assay, qRT-PCR for downstream targets, ex vivo CLL patient samples\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity ligation assay in patient-derived CLL cells, multiple signaling readouts, single lab\",\n      \"pmids\": [\"31578228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Activated Notch1 (N1ICD) in endothelial cells induces cellular senescence and expression of chemokines and VCAM1, promoting neutrophil infiltration, tumor cell adhesion to the endothelium, and intravasation; treatment with Notch1-blocking antibodies or genetic ablation of EC Notch signaling inhibited these pro-metastatic events.\",\n      \"method\": \"Conditional N1ICD expression in ECs, Notch1-blocking antibody treatment, VCAM1 blockade, peritoneal ovarian carcinoma mouse model, lung colonization assays\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function transgenic EC model plus antibody blockade plus genetic ablation, multiple metastatic readouts, in vivo mouse models\",\n      \"pmids\": [\"28238683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Notch1 heterozygosity in aortic valve interstitial cells produces a myofibroblast-like phenotype with higher cadherin-11 (regulated by Akt activity) and decreased Runx2; under cyclic strain, Notch1+/- AVICs show upregulated Akt phosphorylation and smooth muscle α-actin, leading to enhanced dystrophic (not osteogenic) calcific nodule formation.\",\n      \"method\": \"Murine immortalized Notch1+/- AVIC isolation, cyclic strain bioreactor, Akt inhibition, calcification nodule assays, molecular signaling pathway analysis\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic dissection in primary Notch1+/- cells with Akt inhibitor rescue and defined calcification readout, single lab\",\n      \"pmids\": [\"26023079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NOTCH1 transactivates MYC in CLL via binding to B-cell-specific regulatory elements; active intracellular NOTCH1 (ICN1) is detectable in ~50% of peripheral blood CLL cases lacking NOTCH1 mutations and correlates with a NOTCH1 gene-expression signature enriched for B-cell proliferation and survival regulators.\",\n      \"method\": \"ICN1 protein detection, ChIP/reporter assays for MYC regulatory elements, gene expression signature analysis in primary CLL samples\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct demonstration of NOTCH1 binding to B-cell MYC regulatory elements with functional signature, single lab\",\n      \"pmids\": [\"28314854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Hyperactivated PI3K/Akt signaling upregulates Notch1 through NF-κB activity, while hypoxia increases Notch1 mRNA and protein via HIF-1α stabilization; Notch1 is required for Akt and hypoxia to transform melanocytes and maintains cell proliferation and protects cells from stress-induced death in xenograft models.\",\n      \"method\": \"Human melanoma cell lines, xenograft model, PI3K/Akt inhibition, NF-κB inhibition, HIF-1α knockdown, Notch1 knockdown\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pathway-specific inhibitors plus Notch1 knockdown, in vivo xenograft, epistasis established, single lab\",\n      \"pmids\": [\"18924608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Notch1 signaling in type II alveolar epithelial cells (AEC2s) determines cell fate by inhibiting differentiation (reducing lamellar body compartment and surfactant proprotein processing capacity) and causing increased epithelial proliferation, putatively via altered JAK/STAT signaling; Notch1 activity is already activated early in IPF, and pharmacological inhibition of Notch in IPF-derived lung slices improved surfactant processing and reversed fibrosis.\",\n      \"method\": \"Notch1 NICD overexpression in vivo, bleomycin fibrosis model, human IPF precision-cut lung slices with Notch inhibition, flow cytometry, kinome profiling, primary murine/human AEC2s\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo overexpression and inhibition with functional differentiation readouts, human ex vivo validation, single lab\",\n      \"pmids\": [\"36047984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NOTCH1 deficiency in human iPSC-derived cardiomyocytes blocks ventricular-like cardiomyocyte differentiation and promotes atrial-like cardiomyocyte generation through shortening of action potential duration; NOTCH1 KO leads to biased differentiation of cardiac mesoderm toward epicardial and second heart field progenitors at the expense of first heart field progenitors, and defective cardiomyocyte proliferation with downregulated cell cycle progression pathways.\",\n      \"method\": \"CRISPR/Cas9 NOTCH1 deletion in human iPSCs, single-cell RNA-seq at multiple differentiation time points, action potential duration measurement\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with single-cell transcriptomics and electrophysiology, multiple differentiation readouts, rigorous mechanistic dissection\",\n      \"pmids\": [\"36583388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Optogenetic NOTCH1 receptor (optoNotch) allows ligand-independent light-controlled activation of N1ICD and downstream transcription; NOTCH1 activation increases proliferation in MCF7 and MDA-MB-468 breast cancer cells and induces chemoresistance, with cell-type-specific migratory phenotypes.\",\n      \"method\": \"Optogenetic receptor engineering (optoNotch), 2D and 3D spheroid cultures, transcriptional activity assays, chemoresistance assays\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — engineered optogenetic system for ligand-independent N1ICD control with functional readouts, single lab\",\n      \"pmids\": [\"35585598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Reduced Notch1 cleavage in lung endothelial cells impairs endothelial barrier function and increases immune cell infiltration in vessel walls; Dll4-neutralizing antibodies inhibit Notch1 cleavage and induce pulmonary hypertension in mice, while overexpression of constitutively activated Notch1 attenuates pulmonary hypertension progression.\",\n      \"method\": \"Dll4-neutralizing antibody treatment in mice, Notch1 target gene array in human pulmonary microvascular ECs, constitutively activated Notch1 overexpression in vivo, PH mouse models, hemodynamic measurements\",\n      \"journal\": \"Hypertension (Dallas, Tex. : 1979)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic activation/inhibition in vivo with hemodynamic readouts and in vitro mechanistic studies, single lab\",\n      \"pmids\": [\"34739767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PAK1 directly co-localizes and physically interacts with Notch1 in colon epithelial cells; silencing of PAK1 leads to Notch1 activation, and Notch1 activation abrogates the PAK1-Notch1 interaction, identifying a PAK1-Notch1 axis that regulates intestinal crypt homeostasis through Notch1-dependent HES1 and Lgr5 expression.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization in intestinal organoids and cell lines, PAK1/Notch1 siRNA, IL10/PAK1 double-knockout mice\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and co-localization in organoids, in vivo double-KO mouse, single lab\",\n      \"pmids\": [\"33189893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NOTCH1 gene transcription in keratinocytes is directly controlled by transcription factors DLX5 and EGR3 (required for RNA PolII recruitment to the NOTCH1 locus) and estrogen receptor β (ERβ, controlling NOTCH1 transcription through RNA PolII pause release); experimentally increased ERβ expression or ERβ agonist treatment promotes NOTCH1 expression and squamous differentiation in vitro and in mouse xenotransplants.\",\n      \"method\": \"Bioinformatics screening, ChIP (PolII occupancy), ERβ overexpression, ERβ agonist treatment, mouse xenotransplant model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for PolII recruitment, functional ERβ gain-of-function in vitro and in vivo, single lab\",\n      \"pmids\": [\"24743148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Notch1 inhibition in glioblastoma using CRISPR/Cas9-mediated ablation suppresses tumor growth, increases γH2AX foci (indicating impaired DNA repair), radiosensitizes GBM cells, impairs angiogenesis, and attenuates VEGF and hypoxic response to irradiation in xenografts.\",\n      \"method\": \"CRISPR/Cas9 Notch1 ablation, clonogenic assays, γH2AX immunofluorescence, xenograft tumor growth, immunofluorescence staining\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with radiosensitization and angiogenesis readouts in vivo, single lab\",\n      \"pmids\": [\"29152141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Notch1 signaling in osteochondroprogenitor cells (overexpression of NICD1) during fracture healing increases periosteal cell proliferation and migration, expands αSMA-positive cells and their osteoblast progeny, reduces callus cartilage, increases mineralized callus, and improves bone biomechanical strength; conversely, anti-NRR1 antibody inhibition of Notch1 increases cartilage area and reduces callus bone mass.\",\n      \"method\": \"αSMACreERT2-Rosa-NICD1 transgenic mice, anti-NRR1 antibody treatment, fracture callus histology, biomechanical testing, in vitro proliferation/migration assays\",\n      \"journal\": \"Journal of orthopaedic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic gain-of-function and antibody inhibition in vivo with cell-lineage tracing and biomechanical readouts, single lab\",\n      \"pmids\": [\"32141629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Notch1 activation in renal tubular epithelial cells and fibroblasts contributes to TGF-β1/Smad2/3-dependent myofibroblastic phenotype; TGF-β1 induces Notch1 activity and these phenotypic transitions are abolished by Notch1 knockdown or DAPT, and exacerbated by Notch1 overexpression or Jagged-1-Fc activation.\",\n      \"method\": \"Notch1 siRNA, DAPT inhibitor, Jagged-1-Fc activator, fibroblast and TEC in vitro cultures, ureteral obstructive model in rats, CKD patient biopsies\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain and loss of function in vitro plus in vivo rat model with patient validation, single lab\",\n      \"pmids\": [\"31718671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Lyso-Gb3 activates Notch1 signaling in human podocytes, increasing active Notch1 and HES1; Notch1 signaling activates NF-κB to mediate inflammatory chemokine (MCP-1, RANTES) upregulation, and promotes fibrogenic responses including fibronectin upregulation; these effects are abolished by Notch1 siRNA or γ-secretase inhibition.\",\n      \"method\": \"Notch1 siRNA, γ-secretase inhibitor, NFκB inhibitor (parthenolide), lyso-Gb3 treatment of cultured human podocytes, Fabry kidney biopsy immunostaining\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Notch1 siRNA with multiple downstream pathway readouts, human tissue validation, single lab\",\n      \"pmids\": [\"26206887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Notch1 activation in fibroblasts (FSP-1;ROSA Notch1 gain-of-function mice) suppresses fibroblast growth, migration, and differentiation into myofibroblasts, delays wound healing, diminishes collagen deposition, and impairs angiogenic response; IL-6 was identified as a functional Notch1 target in fibroblasts involved in regulating angiogenesis.\",\n      \"method\": \"FSP-1-Cre;ROSA-NICD1 transgenic mouse wound healing model, in vitro fibroblast migration/differentiation assays, IL-6 functional validation\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain-of-function transgenic model with wound healing readouts and in vitro mechanistic follow-up, single lab\",\n      \"pmids\": [\"33109684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Notch1 provides myocardial protection against ischemia-reperfusion injury by improving mitochondrial quality control: Notch1 overexpression increases ATP production, promotes mitochondrial fusion, decreases fission, and inhibits mitophagy by suppressing Pink1 expression and Mfn2/Parkin phosphorylation.\",\n      \"method\": \"Adenoviral Ad-N1ICD and Ad-shN1ICD in rat cardiomyocytes, ischemia-reperfusion injury model, mitophagy and mitochondrial dynamics assays, Pink1/Mfn2/Parkin pathway analysis\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — adenoviral gain/loss of function with mitochondrial functional readouts and pathway mechanistic analysis, single lab\",\n      \"pmids\": [\"30515819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Notch1 (NICD) regulates the aggressiveness of differentiated thyroid cancer (DTC) by suppressing SERPINE1 (PAI-1): NICD induction reduces SERPINE1 expression in a dose-dependent manner and inhibits DTC cell growth and migration in vitro and in an orthotopic xenograft model.\",\n      \"method\": \"Doxycycline-inducible NICD expression system, microarray target discovery, SERPINE1 knockdown, orthotopic thyroid cancer xenograft\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible gain-of-function with microarray target validation and in vivo xenograft, single lab\",\n      \"pmids\": [\"26847059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Notch1 heterozygous loss is sufficient to cause ascending aortic aneurysm in 129S6 background mice; conditional heterozygous deletion of Notch1 in the second heart field (SHF) lineage recapitulates exacerbated aortic root dilation, establishing an SHF lineage-specific role for Notch1 in ascending aortic aneurysm.\",\n      \"method\": \"Notch1 heterozygous mice (129S6 background), SHF lineage-specific Notch1 conditional deletion, Marfan syndrome mouse model crossbreeding, RNA sequencing of aortic root\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vivo mouse genetic models with anatomical and transcriptomic readouts, single lab\",\n      \"pmids\": [\"29093270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Notch1 is required for intermittent hypoxia (IH)-enhanced hippocampal neurogenesis in vivo; IH activates Notch1 signaling in wild-type mice, and Notch1 heterozygous (N+/-) mice fail to upregulate Notch1 activity after IH and show blocked IH-enhanced NSC proliferation, newborn neuron survival/migration, and spine morphogenesis.\",\n      \"method\": \"Notch1 heterozygous mice, intermittent hypoxia protocol, BrdU incorporation, immunohistochemistry for neurogenesis markers\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with Notch1 heterozygous mice and hypoxia protocol, multiple neurogenesis readouts, single lab\",\n      \"pmids\": [\"24368168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cardiac-specific Notch1 deletion causes multiple structural cardiac defects and embryonic lethality; Notch1 is expressed and activated in the myocardium at multiple stages; Notch1 or RBPJk deletion in NFP double-knockout (MDKO) mice partially rescues defects in cardiac progenitor cell differentiation, cardiomyocyte proliferation, and trabecular morphogenesis but not structural defects, indicating NFPs regulate cardiac development through both Notch1-dependent and Notch1-independent mechanisms.\",\n      \"method\": \"Cardiac-specific Notch1 and RBPJk knockout mice, Notch reporter lines, RNAScope, Numb/Numbl/Notch1/RBPJk triple knockout, phenotype comparison\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vivo genetic epistasis mouse models with embryonic cardiac phenotype readouts, single lab\",\n      \"pmids\": [\"34571841\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NOTCH1 is a transmembrane mechanosensitive receptor that is activated by DSL ligands (DLL1/4, JAG1/2) through ligand-endocytosis-dependent conformational changes and sequential proteolytic cleavages (including by γ-secretase/presenilin), releasing the intracellular domain (NICD/N1ICD) that translocates to the nucleus to form a transcriptional activating complex with RBPJk and MAML; NICD activity is positively regulated by p300-mediated acetylation (extending half-life) and negatively regulated by FBW7-mediated phosphorylation-dependent proteasomal degradation, c-Cbl-mediated monoubiquitination/lysosomal degradation (downstream of PI3K/AKT suppression), USP10-mediated deubiquitination (stabilization disrupted by N1DARP), SIRT1-mediated deacetylation, and Src kinase-mediated phosphorylation (impairing MAML recruitment); RFC4 stabilizes NICD by competing with CDK8/FBXW7-dependent degradation; GSK3β controls Notch1 postendocytic recycling to modulate surface receptor levels; NOTCH1 integrates extracellular signals including shear stress (acting as a vascular mechanosensor), O-fucosylation by Fringe enzymes (modulating ligand specificity), and cross-talk with TGF-β/Smad3, PI3K/Akt, NF-κB, HIF-1α, BTK, PAK1, and p53 pathways; its downstream transcriptional targets include HES1, MYC, SERPINE1, VE-cadherin (via SNAI1/ERG repression), and IL-6, governing cell fate decisions in T-cell development, vascular homeostasis, cardiac morphogenesis, podocyte function, and epithelial differentiation, with context-dependent oncogenic or tumor-suppressive roles.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NOTCH1 is a ligand-activated transmembrane receptor whose released intracellular domain (NICD/N1ICD) drives a transcriptional program governing cell-fate decisions across vascular, cardiac, immune, renal, and epithelial tissues [#15, #18, #28]. Signaling initiates when DSL ligands such as DLL4 engage the receptor and trigger clathrin/dynamin-dependent endocytosis of NOTCH1 into SARA-positive endosomes, a step coupled to ligand transendocytosis and required for productive signal transduction [#0]; receptor competence is tuned by O-fucosylation of specific EGF repeats, which controls Lunatic Fringe-mediated potentiation of DLL1-NOTCH1 activation and receptor trafficking [#13], and by GSK3\\u03b2-controlled postendocytic recycling that sets surface receptor levels [#9]. Signal output is determined by the number of NICD molecules reaching the nucleus and the duration of the NICD-RBPJk-MAML-DNA complex, with tissue-specific \\u03b3-secretase cleavage choices tuning NICD stability [#18]. NICD abundance and activity are extensively post-translationally controlled: p300-dependent acetylation extends N1ICD half-life while SIRT1 deacetylates and destabilizes it [#2, #3]; FBW7/FBXW7 mediates phosphorylation-dependent nuclear degradation [#7]; c-Cbl monoubiquitinates NOTCH1 for lysosomal degradation upon PI3K/AKT withdrawal [#6]; the microprotein N1DARP displaces the deubiquitinase USP10 to promote K11/K48 polyubiquitination and proteasomal turnover [#4]; RFC4 stabilizes NICD1 by blocking CDK8/FBXW7-dependent degradation in a feed-forward loop [#5]; and c-Src phosphorylates NICD to reduce MAML recruitment and transcriptional output [#1]. Nuclear NICD transactivates targets including HES1, MYC, SERPINE1, and IL-6 and represses VE-cadherin via SNAI1 and ERG [#16, #25, #39, #37]. In endothelium, NOTCH1 functions as a shear-stress mechanosensor that maintains junctional integrity and suppresses proliferation and inflammation, with loss promoting atherosclerosis and metastatic endothelial activation [#14, #15, #23]. Context-dependent roles span ventricular cardiomyocyte specification and proliferation [#28, #2], aortic and cardiac morphogenesis [#40, #42], podocyte injury in diabetic and Fabry kidney disease [#21, #36], and oncogenic signaling integrated with PI3K/Akt, NF-\\u03baB, HIF-1\\u03b1, and TGF-\\u03b2/Smad3 pathways [#26, #11].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established an upstream brake on NOTCH1 activation during T-cell development by linking p53 to the proteolytic machinery that releases NICD.\",\n      \"evidence\": \"Trp53-/- mouse thymocytes with NIC detection and CD4/CD8 flow cytometry, mapping p53 repression of Presenilin1\",\n      \"pmids\": [\"14991602\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish direct p53 binding to the PS1 promoter\", \"Effect on other tissues not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined how NOTCH1 abundance is driven by oncogenic and hypoxic inputs, showing PI3K/Akt-NF-\\u03baB and HIF-1\\u03b1 converge to upregulate Notch1 and make it required for transformation.\",\n      \"evidence\": \"Melanoma cell lines and xenografts with pathway-specific inhibitors and Notch1 knockdown; plus Co-IP linking N1ICD to phospho-Smad3 in dendritic cells\",\n      \"pmids\": [\"18924608\", \"18292500\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcription-factor occupancy on the NOTCH1 locus not shown in melanoma context\", \"Smad3 interaction surface on NICD not mapped\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified a receptor tyrosine kinase, DDR1, as a physical NOTCH1 partner that links collagen sensing to canonical Notch target activation.\",\n      \"evidence\": \"Tandem affinity purification, Co-IP, nuclear fractionation and DDR1 knockdown with \\u03b3-secretase inhibitor\",\n      \"pmids\": [\"21398698\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which DDR1 activates Notch cleavage unresolved\", \"Single-lab interaction without structural detail\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved that NOTCH1/NOTCH2 functional divergence is encoded by signal strength and NICD complex duration rather than intrinsic ICD differences, with \\u03b3-secretase cleavage choice tuning stability.\",\n      \"evidence\": \"Intracellular domain swap mouse model with genetic epistasis across multiple tissues\",\n      \"pmids\": [\"26062937\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of tissue-specific scissile bond choice not defined\", \"Does not map cofactors setting complex half-life\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Built the degradation arm of NICD regulation, defining FBW7-mediated nuclear degradation and PI3K/AKT-gated c-Cbl monoubiquitination/lysosomal turnover.\",\n      \"evidence\": \"siRNA/overexpression with migration assays in HCC; ubiquitin capture and Co-IP in cells with PI3K inhibition and dominant-negative AKT\",\n      \"pmids\": [\"25955618\", \"26052821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphodegron residues recognized by FBW7 not directly mapped here\", \"c-Cbl ubiquitination site not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established the transcriptional control of the NOTCH1 gene itself in keratinocytes, identifying DLX5/EGR3 and ER\\u03b2 as regulators of PolII recruitment and pause release.\",\n      \"evidence\": \"Bioinformatic screen, ChIP for PolII occupancy, ER\\u03b2 gain-of-function in vitro and in xenotransplants\",\n      \"pmids\": [\"24743148\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality beyond squamous keratinocytes untested\", \"Direct DLX5/EGR3 binding sites not mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined NOTCH1 as a protective, anti-inflammatory regulator of endothelium suppressed by inflammatory lipids/cytokines via STAT3, with loss promoting atherosclerosis.\",\n      \"evidence\": \"siRNA in human aortic ECs, monocyte adhesion assays, Notch1 heterozygous atherosclerosis mouse model\",\n      \"pmids\": [\"26552708\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct STAT3 action on the NOTCH1 locus not shown\", \"Downstream effectors of EC inflammation incompletely defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated that ligand-induced NOTCH1 endocytosis into SARA endosomes is required for signaling, and that GSK3\\u03b2-controlled recycling tunes surface receptor levels.\",\n      \"evidence\": \"Live-cell imaging with clathrin/dynamin inhibition and ligand co-culture; GSK3\\u03b2 inhibition with recycling and NICD production assays\",\n      \"pmids\": [\"26522918\", \"29237816\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptors coupling NOTCH1 to clathrin not identified\", \"GSK3\\u03b2 substrate residue on Notch1 unmapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established NOTCH1 as a vascular mechanosensor, scaling signaling to shear stress to maintain junctional integrity and suppress proliferation through calcium signaling.\",\n      \"evidence\": \"Shear stress assays, siRNA knockdown, calcium rescue, adult endothelial Notch1-knockout atherosclerosis mouse model\",\n      \"pmids\": [\"29158473\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The force-transducing element of NOTCH1 not structurally defined\", \"Link between flow sensing and proteolytic activation unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Expanded NOTCH1 partner biology to cytoskeletal and adhesion contexts, identifying keratin 8/18 as stabilizers in colonocytes and MEGF10 as a disease-relevant ICD partner.\",\n      \"evidence\": \"PLA and reciprocal Co-IP with knockout/rescue (K8/K18); reciprocal Co-IP with pathogenic MEGF10 mutation disruption\",\n      \"pmids\": [\"28475172\", \"28498977\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How keratins stabilize Notch1 protein not mechanistically resolved\", \"MEGF10-Notch1 interaction interface not mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed activated endothelial NOTCH1 (N1ICD) is pro-metastatic, inducing senescence, chemokines and VCAM1 to drive tumor-cell adhesion and intravasation.\",\n      \"evidence\": \"Conditional N1ICD EC expression, Notch1-blocking antibody, VCAM1 blockade, ovarian carcinoma and lung colonization mouse models\",\n      \"pmids\": [\"28238683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional targets driving SASP not fully enumerated\", \"Context distinguishing protective vs pro-metastatic EC Notch1 unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined tissue-specific transcriptional outputs of NOTCH1 in tumor and fibroblast contexts, including MYC transactivation in CLL and IL-6-dependent angiogenic suppression in fibroblasts.\",\n      \"evidence\": \"ICN1 detection and ChIP/reporter on B-cell MYC elements in primary CLL; FSP-1-Cre;ROSA-NICD1 wound-healing mice with IL-6 validation; CRISPR Notch1 ablation radiosensitizing GBM\",\n      \"pmids\": [\"28314854\", \"33109684\", \"29152141\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Opposing growth effects across cell types mechanistically unreconciled\", \"Direct vs indirect target status of IL-6 not fully resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established acetylation as a positive NICD stability switch and phosphorylation by c-Src as a negative one, coupling kinase signaling to transcriptional output.\",\n      \"evidence\": \"Acetylation assays and SIRT1 gain/loss with in vivo cardiac regeneration; Co-IP, in vitro kinase assay and mutagenesis with reporter (Src)\",\n      \"pmids\": [\"29186476\", \"30341382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetylated lysines on N1ICD not enumerated\", \"Crosstalk between Src phosphorylation and FBW7/Cbl pathways untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended NOTCH1 regulation to cell-cycle and B-cell signaling kinases, identifying PLK1 control at G2/M and DNA damage and a BTK-NICD axis transmitting BCR signals in CLL.\",\n      \"evidence\": \"Kinase screen plus Co-IP and cell-cycle analysis (PLK1); PLA and qRT-PCR of targets in CLL patient samples with ibrutinib (BTK)\",\n      \"pmids\": [\"31597699\", \"31578228\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PLK1 directly phosphorylates Notch1 not established\", \"BTK-NICD interaction interface and direct phosphorylation not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined the glycosylation logic of NOTCH1 ligand selectivity and trafficking, mapping specific O-fucose sites required for Fringe-mediated DLL1 potentiation; and identified a PAK1-Notch1 axis controlling crypt homeostasis.\",\n      \"evidence\": \"Cell-based signaling/binding assays with mass spectrometry and EGF O-fucose site mutants; Co-IP and co-localization in organoids with PAK1/Notch1 perturbation and double-KO mice\",\n      \"pmids\": [\"32820046\", \"33189893\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Fringe-modified ligand discrimination not solved\", \"How PAK1 binding restrains Notch1 activation unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined transcriptional and physiological consequences of endothelial NOTCH1, repressing VE-cadherin via SNAI1/ERG and cooperating with pericyte NOTCH3 to stabilize vasculature.\",\n      \"evidence\": \"VE-cadherin promoter dissection with TF knockdown and transgenic NICD1 mice (albuminuria); vascular co-culture with NOTCH1/NOTCH3 siRNA and DLL4 ligand identification; Dll4-neutralization PH model\",\n      \"pmids\": [\"33435713\", \"34878922\", \"34739767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Threshold distinguishing protective vs barrier-disrupting Notch1 unclear\", \"Reconciliation of junction stabilization with VE-cadherin repression incomplete\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established a stabilizing feed-forward loop (RFC4 protecting NICD1 from CDK8/FBXW7 degradation) and cell-type-specific pathological roles in podocytes, fibrosis, and bone.\",\n      \"evidence\": \"Reciprocal Co-IP and degradation assays with target validation in NSCLC; podocyte-specific Notch1 conditional KO diabetic mice; \\u03b1SMACreERT2 NICD1 fracture model with anti-NRR1 antibody\",\n      \"pmids\": [\"33976158\", \"26293507\", \"32141629\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of RFC4 loop beyond NSCLC untested\", \"Compensatory Notch2 upregulation complicates Notch1-specific interpretation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Used engineered and genetic systems to causally dissect NOTCH1's role in cardiomyocyte fate and proliferation and in ligand-independent oncogenic activation.\",\n      \"evidence\": \"CRISPR NOTCH1 KO in human iPSC-cardiomyocytes with scRNA-seq and electrophysiology; optogenetic optoNotch ligand-independent N1ICD control in breast cancer cells\",\n      \"pmids\": [\"36583388\", \"35585598\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effector genes driving ventricular vs atrial fate choice incompletely mapped\", \"optoNotch in vivo relevance untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined ubiquitin-pathway control of NICD by the USP10 deubiquitinase (disruptable by the microprotein N1DARP) and SIRT1-driven deacetylation/degradation, and a fate-controlling role in alveolar epithelium.\",\n      \"evidence\": \"Co-IP, ubiquitination assays and stapled-peptide functional studies in pancreatic cancer (N1DARP/USP10); PLA and in vivo heart-failure model (SIRT1); in vivo and ex vivo IPF lung slices with Notch inhibition\",\n      \"pmids\": [\"37714834\", \"38017499\", \"36047984\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous role of N1DARP microprotein beyond cancer unclear\", \"JAK/STAT linkage in AEC2s remains putative\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse post-translational regulators (acetylation, multiple ubiquitin ligases/DUBs, tyrosine kinases) are integrated to set NICD dose and duration in a given cell type, and what determines NOTCH1's context-dependent oncogenic versus tumor-suppressive output, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified quantitative model of competing NICD stabilizers and degraders\", \"Determinants of tissue-specific protective vs pathogenic Notch1 outcomes undefined\", \"Structural basis of mechanosensing and ligand-dependent cleavage not resolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [16, 25, 39, 5]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 15, 13]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 9, 15]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 10, 22]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 15, 18]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [28, 42, 18]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 6, 7, 5, 2]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [21, 36, 40, 23]}\n    ],\n    \"complexes\": [\n      \"NICD-RBPJk-MAML transcriptional activation complex\"\n    ],\n    \"partners\": [\n      \"RBPJ\",\n      \"MAML\",\n      \"USP10\",\n      \"FBXW7\",\n      \"RFC4\",\n      \"SIRT1\",\n      \"DDR1\",\n      \"BTK\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}