{"gene":"JAG1","run_date":"2026-06-10T01:55:23","timeline":{"discoveries":[{"year":2001,"finding":"JAG1 missense mutations R184H and L37S cause loss of Notch signaling activity, abnormal glycosylation, failure to reach the cell surface, and intracellular accumulation (likely in the ER), establishing defective intracellular transport as a disease mechanism in Alagille syndrome. Missense mutations P163L and P871R showed normal cell-surface localization and normal Notch signaling, consistent with polymorphisms rather than pathogenic mutations.","method":"Cell-surface localization assays, glycosylation analysis, Notch signaling reporter assays, site-directed mutagenesis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal methods (signaling assay, glycosylation, surface localization) in a single focused study with mutagenesis","pmids":["11157803"],"is_preprint":false},{"year":2003,"finding":"The JAG1-G274D missense mutation produces two protein populations: one abnormally glycosylated and retained intracellularly (non-functional), and one normally glycosylated and surface-localized (functional). The mutation is temperature-sensitive, producing more non-functional protein at higher temperatures. Carriers have >50% but <100% normal JAG1 surface levels. The cardiac-specific phenotype of this family indicates that the developing heart is more sensitive than the developing liver to reduced JAG1 dosage.","method":"Cell fractionation, glycosylation analysis, cell-surface localization, temperature-shift experiments, Notch signaling assay","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal biochemical methods (glycosylation, fractionation, signaling) in a focused mechanistic study","pmids":["12649809"],"is_preprint":false},{"year":1998,"finding":"JAG1 mutations (deletions, truncations, and missense) cause Alagille syndrome primarily through haploinsufficiency, as deletion of the entire gene produces the same phenotype as intragenic truncating mutations. Two missense mutations at the same amino acid residue suggest that mechanisms beyond haploinsufficiency may also exist.","method":"SSCP mutation screening, FISH gene deletion analysis, phenotype-genotype correlation in 54 AGS patients/families","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Strong — replicated across many families, genotype-phenotype analysis; functional mechanism inferred from deletion = truncation equivalence rather than direct biochemical reconstitution","pmids":["9585603"],"is_preprint":false},{"year":2010,"finding":"Mind bomb (Mib) ubiquitylates Jagged1 (Jag1) and is required in signal-sending cells for Jag1 to activate Notch signaling. In zebrafish, Mib-Jag1-Notch signaling governs cell-fate decisions between vacuolated and non-vacuolated notochord cells, affecting peri-notochordal basement membrane formation.","method":"Zebrafish loss-of-function and gain-of-function genetics, ubiquitylation assay, in vivo imaging","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct biochemical ubiquitylation assay combined with in vivo genetic epistasis in zebrafish","pmids":["20573700"],"is_preprint":false},{"year":2010,"finding":"JAG1 missense mutations associated with right-sided cardiac defects (TOF, PS) display heterogeneous effects on protein localization, post-translational modification, and Notch signaling activation, with some behaving as complete haploinsufficiency alleles, indicating that additional tissue-specific modifiers influence organ-specific phenotypes.","method":"Protein localization assays, post-translational modification analysis, Notch signaling reporter assay in patient-derived missense mutants","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays for four missense variants, single lab","pmids":["20437614"],"is_preprint":false},{"year":2012,"finding":"JAG1 is upregulated in adrenocortical carcinoma (ACC) and enhances cell proliferation through activation of canonical Notch signaling in a non-cell-autonomous (juxtacrine) manner; JAG1 knockdown and inhibition of post-receptor Notch signaling (DNMaml) both reduce proliferation equivalently.","method":"Jag1 shRNA knockdown, co-culture FACS proliferation assay, luciferase Notch reporter, immunoblot, QPCR","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and dominant-negative signaling inhibition with defined proliferative readout, single lab","pmids":["22427350"],"is_preprint":false},{"year":2017,"finding":"In Sertoli cells, JAG1 expressed on the surface of spermatogonial stem/progenitor cells activates canonical NOTCH signaling in Sertoli cells; NOTCH targets HES1 and HEY1 directly bind the Gdnf promoter and repress GDNF expression, establishing a negative feedback loop that limits stem cell self-renewal.","method":"Double-mutant mouse model, dual luciferase assay, ChIP-qPCR, in vitro co-culture","journal":"Stem cells and development","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — ChIP-qPCR + luciferase + genetic double mutant in vivo, multiple orthogonal methods","pmids":["28051360"],"is_preprint":false},{"year":2019,"finding":"In colorectal cancer with mutant Kras, KRAS/ERK/ADAM17 signaling drives constitutive cleavage of Jagged1, releasing the intracellular domain (Jag1-ICD), which translocates to the nucleus and drives tumor growth, EMT, and chemoresistance via a non-canonical reverse signaling mechanism independent of trans-Notch activation.","method":"In vitro cleavage assays, nuclear fractionation, gain/loss-of-function experiments in vitro and xenograft models, pharmacologic ADAM17 inhibition","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — biochemical cleavage/fractionation plus in vitro and in vivo functional assays, multiple orthogonal methods in one study","pmids":["31506332"],"is_preprint":false},{"year":2022,"finding":"The JAG1 intracellular domain (JICD1), generated by proteolytic processing analogous to NOTCH1, acts as a transcriptional cofactor by forming a complex with DDX17, SMAD3, and TGIF2, increasing SOX2 expression and driving astrocyte transformation toward cancer stem cell properties (tumor formation, invasiveness, stemness, therapy resistance).","method":"Transcriptome analysis, ChIP-seq, proteomics, gain-of-function, SOX2 rescue experiments","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP-seq + proteomics + transcriptomics + functional rescue, single lab but multiple orthogonal methods","pmids":["36417870"],"is_preprint":false},{"year":2022,"finding":"Disturbed blood flow activates the JAG1-NOTCH4 signaling pathway in endothelial cells; EC-specific genetic deletion of Jag1 reduces atherosclerosis at sites of disturbed flow. Single-cell RNA sequencing shows Jag1 suppresses proliferating/migrating EC subsets, establishing JAG1 as a pro-atherogenic mechanosensor.","method":"EC-specific Jag1 knockout mice, porcine/murine artery models, human coronary artery EC culture, light-sheet imaging, scRNA-seq","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — EC-specific conditional KO in mice + human cell culture + scRNA-seq + light-sheet imaging, replicated across species","pmids":["36044575"],"is_preprint":false},{"year":2019,"finding":"Jag1 and Dll4 exert antagonistic roles in coronary arterial development: endocardial Jag1 removal blocks sinus venosus capillary sprouting (primary plexus formation), while Dll4 inactivation stimulates excessive capillary growth. EphrinB2 is a critical downstream effector of the antagonistic Dll4-Jag1 functions in arterial morphogenesis, epistatic rescue experiments confirming this cascade.","method":"Conditional endocardial Jag1 and Dll4 knockout mice, Mfng forced expression, ventricular explant angiogenic rescue, primary human EC experiments","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple conditional KO alleles + rescue experiments in vivo and in vitro, epistasis established across species","pmids":["31789590"],"is_preprint":false},{"year":2020,"finding":"Jag1, uniformly expressed in multipotent pancreatic progenitors (MPCs), restrains MPC growth. When Jag1 expression later segregates to pro-acinar cells, it becomes critical for bipotent progenitor specification; Jag1;Dll1 double mutants lose all bipotent progenitors. Jag1 modulates oscillating Hes1 activity to coordinate MPC growth and fate.","method":"Conditional Jag1 knockout mice, Jag1;Dll1 double mutants, Hes1 oscillation imaging, lineage tracing","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO, double mutant epistasis, and live oscillation imaging across developmental stages","pmids":["32059775"],"is_preprint":false},{"year":2012,"finding":"SNX17 binds Jag1a and promotes retromer-dependent recycling of Jag1a to the plasma membrane in ligand-expressing cells, thereby maintaining Jag1a protein levels at the cell surface and enabling Notch signaling activation; inhibition of this pathway impairs neurogenesis and pancreas development in zebrafish.","method":"Co-IP, zebrafish knockdown, cell-surface protein assays, genetic epistasis in zebrafish","journal":"Cell regeneration","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP binding plus in vivo zebrafish functional assay, single lab","pmids":["25408867"],"is_preprint":false},{"year":2014,"finding":"JAG1 mediates pro-proliferative and pro-survival signaling in medulloblastoma via activation of NOTCH2 receptor and induction of HES1 expression; JAG1 knockdown reduces MB cell survival.","method":"shRNA knockdown, Notch signaling reporter, HES1 expression analysis in MB cell lines and primary tumor cohorts","journal":"Acta neuropathologica communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined signaling and proliferative readout, single lab","pmids":["24708907"],"is_preprint":false},{"year":2022,"finding":"In the tracheobronchial epithelium, JAG1 undergoes posttranslational processing by the γ-secretase complex (GSC) generating a C-terminal peptide, and GSC also regulates abundance of full-length JAG2 at the cell surface. These PTMs create distinct JAG1/JAG2 assemblies that regulate Notch signal strength and determine goblet vs. ciliated cell fate via a WNT-independent mechanism.","method":"GSC inhibitor treatment, neutralizing peptides/antibodies, biochemical fractionation, RNA-Seq, WNT agonist/antagonist studies in human air-liquid-interface cultures","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacologic perturbations + RNA-Seq, single lab","pmids":["35819850"],"is_preprint":false},{"year":2024,"finding":"HOXA5 directly binds the JAG1 gene promoter and represses its transcription; loss of HOXA5 via DNA methylation in kidney fibrosis de-represses JAG1, activating JAG1-NOTCH signaling and promoting fibrogenesis. Conditional Hoxa5 KO aggravates fibrosis; conditional Hoxa5 knockin suppresses it.","method":"ChIP (HOXA5 on Jag1 promoter), conditional KO and knockin mice, 5-Aza treatment, genome-wide methylation analysis","journal":"Kidney international","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct ChIP of transcription factor on JAG1 promoter + conditional KO and knockin in vivo + pharmacologic validation","pmids":["38521405"],"is_preprint":false},{"year":2022,"finding":"In T-ALL, leukemia-derived small extracellular vesicles activate PERK-eIF2a-ATF4 signaling in bone marrow endothelial cells; ATF4 directly upregulates JAG1 transcription (confirmed by ChIP), remodeling the vascular niche. EC-specific PERK deletion abolishes aberrant JAG1 upregulation, improves HSC maintenance, and improves leukemia survival.","method":"ChIP (ATF4 on JAG1), EC-specific PERK knockout mice, small extracellular vesicle characterization, transcriptomic analysis, xenograft models","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — ChIP mechanistic link + EC-specific conditional KO + SEV mechanistic studies + human T-ALL validation","pmids":["35401837"],"is_preprint":false},{"year":2024,"finding":"Soluble, multivalent Jag1 presented on DNA origami nanostructures activates Notch signaling in neuroepithelial stem-like cells without requiring a pulling force, demonstrating that prolonged multivalent Jag1 binding is sufficient for Notch activation in the absence of mechanical force.","method":"DNA origami nanopattern display of Jag1, Notch signaling reporter assays, chimeric ligand controls ruling out confounders","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — molecularly precise reconstitution with multiple chimeric controls, single lab but rigorous mechanistic design","pmids":["38238313"],"is_preprint":false},{"year":2019,"finding":"Oocyte-expressed JAG1 activates Notch signaling in ovarian granulosa cells: germ cell ablation or oocyte-specific Jag1 deletion suppresses Notch activation in granulosa cells, and recombinant JAG1 enhances Notch target gene expression in granulosa cells in vitro.","method":"Transgenic Notch reporter mice, busulfan germ cell ablation, KitWv/Wv mice, oocyte-specific Jag1 conditional KO, recombinant JAG1 treatment of granulosa cells","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (conditional KO, germ cell ablation, KitWv) plus recombinant protein rescue, all pointing to same conclusion","pmids":["31609444"],"is_preprint":false},{"year":2018,"finding":"In ATL cells, JAG1 overexpression is driven by the HTLV-1 viral protein Tax and cellular factors miR-124a, STAT3, and NFATc1. Blockade of JAG1 signaling by shRNA knockdown or neutralizing antibodies dampens Notch1 downstream signaling and limits cell migration of ATL cells.","method":"RT-PCR, FACS, IHC, shRNA knockdown, neutralizing antibodies, Notch signaling analysis","journal":"Journal of hematology & oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD plus neutralizing antibody with defined signaling and migration readout, single lab","pmids":["30231940"],"is_preprint":false},{"year":2014,"finding":"JAG1 membrane localization (but not cytoplasmic localization) in HCC is associated with extrahepatic metastasis and correlates with Notch1 membrane localization; JAG1 or Notch1 knockdown reduces osteopontin (OPN) expression in HCC cells, placing JAG1/Notch1/OPN in a functional cascade regulating metastasis.","method":"Tissue microarray localization (112 tumors), RNA interference of JAG1 and Notch1, OPN expression measurement","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — RNAi functional assay plus spatial localization in tissue array, single lab","pmids":["25176314"],"is_preprint":false},{"year":2021,"finding":"JAG1 in normal epidermal cells activates Notch1 in senescent cells and is required for their removal from the basal layer; JAG1 knockdown in normal cells or Notch signaling inhibition suppresses preferential removal of senescent cells from the basal layer in 3D reconstructed epidermis.","method":"3D reconstructed epidermis with mixed normal and UVB-senescent cells, JAG1 siRNA knockdown, Notch inhibitor treatment, FACS and microscopy","journal":"Experimental dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and pharmacologic inhibition in 3D model with defined cellular readout, single lab","pmids":["33891780"],"is_preprint":false},{"year":2022,"finding":"FAS receptor controls JAG1 expression and NOTCH pathway activity through ERK phosphorylation in OSCC cells; FAS ligand or recombinant JAG1 protein treatment increases NOTCH activity, and this is abolished by FAS receptor knockout. NOTCH1 intracellular domain rescues spheroid formation in FAS KO cells, placing FAS-ERK-JAG1-NOTCH1 in a linear cascade.","method":"FAS receptor knockout, cDNA microarray, phosphoprotein arrays, NOTCH1-ICD rescue, pharmacologic ERK inhibition, in vivo xenograft","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO + rescue experiment + pharmacologic confirmation, single lab","pmids":["35249111"],"is_preprint":false},{"year":2023,"finding":"Jag1-mediated cis-inhibition of Notch receptors in multipotent pancreatic progenitors is a cell-autonomous mechanism that drives exit from the multipotent state; a mathematical model validated against Jag1 and Dll1 KO mice and small molecule Notch inhibitors shows cis-interaction is required for MPC differentiation while trans-interaction is required for bipotent fate adoption.","method":"Mathematical modeling validated against conditional KO mice (Jag1, Dll1), small molecule Notch pathway inhibitors, comparison with published mutant phenotypes","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — computational model validated against multiple genetic KOs and pharmacological perturbations, single lab; model-based inference limits confidence","pmids":["36681690"],"is_preprint":false},{"year":2024,"finding":"IGF2BP3 (an m6A reader) binds and stabilizes Jag1 mRNA; IGF2BP3 knockout reduces m6A content and expression of Jag1 and downstream Hes1 in hepatic stellate cells, decreasing GPX4 and promoting HSC ferroptosis to reduce liver fibrosis.","method":"IGF2BP3 KO mice (HSC-specific), m6A multi-omics, Hes1/GPX4 measurement, ferroptosis assays","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with m6A profiling and functional ferroptosis readout, single lab","pmids":["39113232"],"is_preprint":false}],"current_model":"JAG1 is a transmembrane Notch pathway ligand that activates Notch receptors in adjacent cells (trans-activation) via a mechanism requiring endocytic recycling (SNX17/retromer) and ubiquitylation by Mind bomb; its intracellular domain (JICD1/Jag1-ICD) can also be proteolytically released by ADAM17/γ-secretase and act as a nuclear transcriptional cofactor (with DDX17/SMAD3/TGIF2) driving oncogenic transformation, while its surface localization, glycosylation, and signaling capacity are disrupted by disease-causing missense mutations that cause ER retention; JAG1 expression is transcriptionally repressed by HOXA5 and induced by ATF4, and its activity is modulated by posttranslational processing to generate distinct molecular assemblies that tune Notch signal strength and cell-fate outcomes in multiple tissues including pancreas, ovary, testis, heart, and endothelium."},"narrative":{"mechanistic_narrative":"JAG1 is a transmembrane Notch pathway ligand that activates Notch receptors on adjacent cells to control cell-fate decisions across diverse tissues including pancreas, ovary, testis, heart, vasculature, and epidermis [PMID:32059775, PMID:31609444, PMID:28051360, PMID:31789590, PMID:33891780]. Productive trans-activation depends on events in the signal-sending cell: ubiquitylation by Mind bomb is required for Jag1 to activate Notch [PMID:20573700], and SNX17/retromer-dependent endocytic recycling maintains surface Jag1 levels to sustain signaling [PMID:25408867]; multivalent Jag1 presentation is sufficient to activate Notch even in the absence of mechanical pulling force [PMID:38238313]. Through this axis JAG1 engages NOTCH1, NOTCH2, and NOTCH4 receptors and drives canonical HES1/HEY1 target induction that governs context-specific outcomes—repressing GDNF in a Sertoli-cell feedback loop limiting spermatogonial self-renewal [PMID:28051360], restraining and then specifying pancreatic progenitor fate via modulation of oscillating Hes1, with parallel cell-autonomous cis-inhibition driving exit from multipotency [PMID:32059775, PMID:36681690], and acting as a pro-atherogenic mechanosensor at sites of disturbed flow in antagonism with Dll4 during coronary morphogenesis [PMID:36044575, PMID:31789590]. Independently of trans-Notch signaling, the JAG1 intracellular domain is liberated by ADAM17/γ-secretase processing and translocates to the nucleus, where as JICD1 it partners with DDX17, SMAD3, and TGIF2 to induce SOX2 and drive oncogenic transformation, EMT, and therapy resistance [PMID:31506332, PMID:36417870]. Disease-causing missense mutations disrupt JAG1 glycosylation and cell-surface trafficking, causing ER retention and loss of signaling, establishing haploinsufficiency and defective intracellular transport as the basis of Alagille syndrome and associated cardiac defects [PMID:11157803, PMID:12649809, PMID:9585603]. JAG1 expression is itself tightly controlled, being directly repressed by HOXA5 and induced by ATF4 [PMID:38521405, PMID:35401837].","teleology":[{"year":1998,"claim":"Established the genetic basis of Alagille syndrome by showing that whole-gene deletion phenocopies intragenic truncations, defining JAG1 haploinsufficiency as the disease mechanism.","evidence":"SSCP mutation screening and FISH deletion analysis with genotype-phenotype correlation across 54 AGS families","pmids":["9585603"],"confidence":"Medium","gaps":["Mechanism inferred from deletion=truncation equivalence rather than biochemical reconstitution","Does not explain the basis of organ-specific phenotypic variability"]},{"year":2001,"claim":"Resolved how missense mutations cause disease by demonstrating that pathogenic variants abolish glycosylation and surface delivery, retaining JAG1 intracellularly and ablating Notch signaling, distinguishing true mutations from polymorphisms.","evidence":"Cell-surface localization, glycosylation analysis, and Notch reporter assays with site-directed mutagenesis","pmids":["11157803"],"confidence":"High","gaps":["Did not identify the trafficking machinery responsible for ER retention","Does not address dosage thresholds across tissues"]},{"year":2003,"claim":"Explained organ-specific sensitivity by showing a temperature-sensitive missense allele yields mixed functional/non-functional protein populations and that the heart tolerates reduced JAG1 dosage less than the liver.","evidence":"Cell fractionation, glycosylation, temperature-shift, and signaling assays in a cardiac-phenotype family","pmids":["12649809"],"confidence":"High","gaps":["Molecular basis of tissue-specific dosage sensitivity not defined","Modifier genes not identified"]},{"year":2010,"claim":"Identified Mind bomb ubiquitylation of Jag1 in signal-sending cells as a required step for ligand-dependent Notch activation, linking ligand endocytosis to signaling competence and to notochord cell-fate decisions.","evidence":"Zebrafish loss/gain-of-function genetics, ubiquitylation assay, and in vivo imaging","pmids":["20573700"],"confidence":"High","gaps":["Ubiquitylation site mapping not defined","Did not address how ubiquitylation couples to endocytic pulling force"]},{"year":2012,"claim":"Defined the trafficking pathway that sustains ligand signaling, showing SNX17 binds Jag1 and drives retromer-dependent recycling to the surface to maintain Notch-activating ligand levels.","evidence":"Co-IP, zebrafish knockdown, cell-surface protein assays, and genetic epistasis","pmids":["25408867"],"confidence":"Medium","gaps":["Single-lab Co-IP without reciprocal structural validation","Recycling kinetics and human relevance not established"]},{"year":2012,"claim":"Showed JAG1 acts in a juxtacrine manner to drive proliferation through canonical Notch signaling in adrenocortical carcinoma, an early demonstration of its oncogenic trans-activating role.","evidence":"shRNA knockdown, co-culture proliferation assay, Notch reporter, immunoblot","pmids":["22427350"],"confidence":"Medium","gaps":["Receptor identity not specified","Downstream target genes not mapped"]},{"year":2014,"claim":"Extended JAG1's pro-tumor role across cancer types, linking it to NOTCH2/HES1 survival signaling in medulloblastoma and to a NOTCH1/osteopontin metastatic cascade dependent on membrane localization in HCC.","evidence":"shRNA/RNAi knockdown, Notch reporter and HES1 readout in MB lines; tissue microarray localization and OPN measurement in HCC","pmids":["24708907","25176314"],"confidence":"Medium","gaps":["Causality between membrane localization and metastasis correlative","Receptor selectivity mechanism unclear"]},{"year":2017,"claim":"Revealed a tissue feedback circuit in which spermatogonial JAG1 activates Sertoli-cell Notch, whose targets HES1/HEY1 directly repress Gdnf to limit stem-cell self-renewal.","evidence":"Double-mutant mice, dual luciferase, ChIP-qPCR, and co-culture","pmids":["28051360"],"confidence":"High","gaps":["Quantitative contribution to germline homeostasis in vivo not measured"]},{"year":2019,"claim":"Uncovered a non-canonical reverse-signaling mechanism: KRAS/ERK/ADAM17 cleaves Jagged1 to release a nuclear Jag1-ICD that drives tumor growth, EMT, and chemoresistance independent of trans-Notch activation.","evidence":"In vitro cleavage assays, nuclear fractionation, gain/loss-of-function, xenografts, and ADAM17 inhibition","pmids":["31506332"],"confidence":"High","gaps":["Nuclear partners of Jag1-ICD not identified in this study","Direct transcriptional targets not mapped"]},{"year":2019,"claim":"Defined antagonistic ligand functions in vascular morphogenesis, with endocardial Jag1 required for capillary sprouting opposing Dll4, converging on EphrinB2 as a downstream effector.","evidence":"Conditional Jag1/Dll4 KO mice, Mfng forced expression, explant rescue, and human EC experiments","pmids":["31789590"],"confidence":"High","gaps":["Mechanism of Fringe-dependent ligand discrimination not fully resolved"]},{"year":2019,"claim":"Established an oocyte-to-somatic signaling role for JAG1 in the ovary, where germ-cell-expressed JAG1 activates Notch in granulosa cells.","evidence":"Notch reporter mice, germ cell ablation, KitWv/Wv mice, oocyte-specific Jag1 KO, and recombinant JAG1 rescue","pmids":["31609444"],"confidence":"High","gaps":["Receptor and downstream granulosa targets not detailed"]},{"year":2020,"claim":"Dissected dual roles in pancreatic development, showing Jag1 restrains progenitor growth and, upon segregation to pro-acinar cells, is required for bipotent progenitor specification by modulating oscillating Hes1.","evidence":"Conditional Jag1 KO, Jag1;Dll1 double mutants, Hes1 oscillation imaging, and lineage tracing","pmids":["32059775"],"confidence":"High","gaps":["How Jag1 expression segregation is controlled not defined"]},{"year":2022,"claim":"Identified the nuclear cofactor complex through which the JAG1 intracellular domain drives transformation, showing JICD1 binds DDX17/SMAD3/TGIF2 to induce SOX2 and confer cancer-stem-cell properties.","evidence":"ChIP-seq, proteomics, transcriptomics, gain-of-function, and SOX2 rescue","pmids":["36417870"],"confidence":"High","gaps":["Stoichiometry and structure of the JICD1 complex unresolved","Generality beyond astrocyte transformation untested"]},{"year":2022,"claim":"Established JAG1 as a pro-atherogenic endothelial mechanosensor, with disturbed flow activating JAG1-NOTCH4 and suppressing proliferative/migratory EC subsets.","evidence":"EC-specific Jag1 KO mice, multi-species artery models, human EC culture, light-sheet imaging, scRNA-seq","pmids":["36044575"],"confidence":"High","gaps":["Direct mechanotransduction step linking flow to JAG1 not defined"]},{"year":2022,"claim":"Showed γ-secretase processing generates distinct JAG1/JAG2 molecular assemblies that tune Notch signal strength and goblet versus ciliated cell fate in airway epithelium.","evidence":"GSC inhibition, neutralizing peptides/antibodies, fractionation, RNA-Seq in air-liquid-interface cultures","pmids":["35819850"],"confidence":"Medium","gaps":["Identity and function of the C-terminal peptide product unclear","Single-lab pharmacologic perturbations"]},{"year":2022,"claim":"Mapped upstream regulation of JAG1 expression in distinct contexts: ATF4 directly transactivates JAG1 to remodel the leukemic vascular niche, and FAS-ERK signaling controls JAG1 in a linear FAS-ERK-JAG1-NOTCH1 oncogenic cascade.","evidence":"ChIP (ATF4 on JAG1), EC-specific PERK KO mice, SEV studies in T-ALL; FAS KO, phosphoprotein arrays, NOTCH1-ICD rescue in OSCC","pmids":["35401837","35249111"],"confidence":"High","gaps":["Cross-talk between transcriptional regulators of JAG1 not integrated"]},{"year":2023,"claim":"Distinguished cis from trans Jag1 functions in pancreatic fate, with cis-inhibition of Notch driving multipotency exit and trans-interaction required for bipotent fate.","evidence":"Mathematical modeling validated against Jag1/Dll1 KO mice and small-molecule Notch inhibitors","pmids":["36681690"],"confidence":"Medium","gaps":["Model-based inference limits mechanistic confidence","Molecular basis of cis versus trans engagement not biochemically resolved"]},{"year":2024,"claim":"Demonstrated that prolonged multivalent ligand binding is sufficient for Notch activation, decoupling JAG1-driven signaling from mechanical pulling force.","evidence":"DNA origami nanopattern display of soluble Jag1 with chimeric ligand controls and Notch reporters","pmids":["38238313"],"confidence":"High","gaps":["Relationship between force-independent and endocytosis-dependent activation in vivo unresolved"]},{"year":2024,"claim":"Defined post-transcriptional and transcriptional control of JAG1 in fibrosis: HOXA5 directly represses JAG1 (lost via DNA methylation in kidney fibrosis), and the m6A reader IGF2BP3 stabilizes Jag1 mRNA to sustain Hes1/GPX4 and suppress hepatic stellate cell ferroptosis.","evidence":"ChIP and conditional KO/knockin mice with 5-Aza (HOXA5 axis); IGF2BP3 KO mice with m6A multi-omics and ferroptosis assays (HSC axis)","pmids":["38521405","39113232"],"confidence":"High","gaps":["Integration of methylation, m6A, and transcription factor inputs on JAG1 unresolved"]},{"year":null,"claim":"How the distinct JAG1 modes—force-dependent trans-activation, force-independent multivalent activation, cis-inhibition, and nuclear JICD1 reverse signaling—are coordinately selected within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model integrating trafficking, cleavage, and receptor engagement modes","Structural basis of JICD1 cofactor complex unknown","Determinants of receptor (NOTCH1/2/4) selectivity undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[3,6,17,18]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[7,8]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[9]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,12,20]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,6,11,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[10,11,18]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,2,7,9]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8,15,16]}],"complexes":["JICD1-DDX17-SMAD3-TGIF2 transcriptional complex"],"partners":["NOTCH1","NOTCH2","NOTCH4","MIB1","SNX17","DDX17","SMAD3","TGIF2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P78504","full_name":"Protein jagged-1","aliases":[],"length_aa":1218,"mass_kda":133.8,"function":"Ligand for multiple Notch receptors and involved in the mediation of Notch signaling (PubMed:18660822, PubMed:20437614). May be involved in cell-fate decisions during hematopoiesis (PubMed:9462510). Seems to be involved in early and late stages of mammalian cardiovascular development. Inhibits myoblast differentiation (By similarity). Enhances fibroblast growth factor-induced angiogenesis (in vitro)","subcellular_location":"Membrane; Cell membrane","url":"https://www.uniprot.org/uniprotkb/P78504/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/JAG1","classification":"Not Classified","n_dependent_lines":31,"n_total_lines":1208,"dependency_fraction":0.02566225165562914},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/JAG1","total_profiled":1310},"omim":[{"mim_id":"621120","title":"DELTA-LIKE NONCANONICAL NOTCH LIGAND 2; DLK2","url":"https://www.omim.org/entry/621120"},{"mim_id":"619574","title":"CHARCOT-MARIE-TOOTH DISEASE, AXONAL, TYPE 2HH; CMT2HH","url":"https://www.omim.org/entry/619574"},{"mim_id":"617992","title":"DEAFNESS, CONGENITAL HEART DEFECTS, AND POSTERIOR EMBRYOTOXON; 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insight","url":"https://pubmed.ncbi.nlm.nih.gov/35819850","citation_count":15,"is_preprint":false},{"pmid":"26576184","id":"PMC_26576184","title":"Alagille syndrome and a JAG1 mutation: 41 cases of experience at a single center.","date":"2015","source":"Korean journal of pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/26576184","citation_count":15,"is_preprint":false},{"pmid":"35530295","id":"PMC_35530295","title":"DNA repair proteins as the targets for paroxetine to induce cytotoxicity in gastric cancer cell AGS.","date":"2022","source":"American journal of cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/35530295","citation_count":15,"is_preprint":false},{"pmid":"21626237","id":"PMC_21626237","title":"Cytotoxicity of methylsulfonylmethane on gastrointestinal (AGS, HepG2, and KEYSE-30) cancer cell lines.","date":"2012","source":"Journal of gastrointestinal cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21626237","citation_count":15,"is_preprint":false},{"pmid":"35441583","id":"PMC_35441583","title":"LINC00173 regulates polycystic ovarian syndrome progression by promoting apoptosis and repressing proliferation in ovarian granulosa cells via the microRNA-124-3p (miR-124-3p)/jagged canonical Notch ligand 1 (JAG1) pathway.","date":"2022","source":"Bioengineered","url":"https://pubmed.ncbi.nlm.nih.gov/35441583","citation_count":15,"is_preprint":false},{"pmid":"32144602","id":"PMC_32144602","title":"MicroRNA-489-3p Represses Hepatic Stellate Cells Activation by Negatively Regulating the JAG1/Notch3 Signaling Pathway.","date":"2020","source":"Digestive diseases and sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32144602","citation_count":15,"is_preprint":false},{"pmid":"15712272","id":"PMC_15712272","title":"Twelve novel JAG1 gene mutations in Polish Alagille syndrome patients.","date":"2005","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/15712272","citation_count":15,"is_preprint":false},{"pmid":"30809951","id":"PMC_30809951","title":"Downregulation of AKT and MDM2, Melatonin Induces Apoptosis in AGS and MGC803 Cells.","date":"2019","source":"Anatomical record (Hoboken, N.J. : 2007)","url":"https://pubmed.ncbi.nlm.nih.gov/30809951","citation_count":14,"is_preprint":false},{"pmid":"28713992","id":"PMC_28713992","title":"miR‑140‑5p inhibits human glioma cell growth and invasion by targeting JAG1.","date":"2017","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/28713992","citation_count":14,"is_preprint":false},{"pmid":"25408867","id":"PMC_25408867","title":"SNX17 regulates Notch pathway and pancreas development through the retromer-dependent recycling of Jag1.","date":"2012","source":"Cell regeneration (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/25408867","citation_count":14,"is_preprint":false},{"pmid":"31781973","id":"PMC_31781973","title":"miR-34a-5p Inhibits Cell Proliferation, Migration and Invasion Through Targeting JAG1/Notch1 Pathway in HPV-Infected Human Epidermal Keratinocytes.","date":"2019","source":"Pathology oncology research : POR","url":"https://pubmed.ncbi.nlm.nih.gov/31781973","citation_count":13,"is_preprint":false},{"pmid":"31157196","id":"PMC_31157196","title":"Alagille Syndrome: A Novel Mutation in JAG1 Gene.","date":"2019","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/31157196","citation_count":13,"is_preprint":false},{"pmid":"34952204","id":"PMC_34952204","title":"A novel mechanism of the lncRNA PTTG3P/miR-142-5p/JAG1 axis modulating tongue cancer cell phenotypes through the Notch1 signaling.","date":"2021","source":"Cells & 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dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/33891780","citation_count":12,"is_preprint":false},{"pmid":"25176314","id":"PMC_25176314","title":"Spatial localization of the JAG1/Notch1/osteopontin cascade modulates extrahepatic metastasis in hepatocellular carcinoma.","date":"2014","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/25176314","citation_count":12,"is_preprint":false},{"pmid":"35807254","id":"PMC_35807254","title":"Volatilomic Signatures of AGS and SNU-1 Gastric Cancer Cell Lines.","date":"2022","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/35807254","citation_count":11,"is_preprint":false},{"pmid":"35401837","id":"PMC_35401837","title":"Endothelial PERK-ATF4-JAG1 axis activated by T-ALL remodels bone marrow vascular niche.","date":"2022","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/35401837","citation_count":11,"is_preprint":false},{"pmid":"34681197","id":"PMC_34681197","title":"Anti-Cancer Potential of Afzelin towards AGS Gastric Cancer Cells.","date":"2021","source":"Pharmaceuticals (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/34681197","citation_count":11,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50254,"output_tokens":6067,"usd":0.120884,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14835,"output_tokens":5776,"usd":0.109287,"stage2_stop_reason":"end_turn"},"total_usd":0.230171,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"JAG1 missense mutations R184H and L37S cause loss of Notch signaling activity, abnormal glycosylation, failure to reach the cell surface, and intracellular accumulation (likely in the ER), establishing defective intracellular transport as a disease mechanism in Alagille syndrome. Missense mutations P163L and P871R showed normal cell-surface localization and normal Notch signaling, consistent with polymorphisms rather than pathogenic mutations.\",\n      \"method\": \"Cell-surface localization assays, glycosylation analysis, Notch signaling reporter assays, site-directed mutagenesis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal methods (signaling assay, glycosylation, surface localization) in a single focused study with mutagenesis\",\n      \"pmids\": [\"11157803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The JAG1-G274D missense mutation produces two protein populations: one abnormally glycosylated and retained intracellularly (non-functional), and one normally glycosylated and surface-localized (functional). The mutation is temperature-sensitive, producing more non-functional protein at higher temperatures. Carriers have >50% but <100% normal JAG1 surface levels. The cardiac-specific phenotype of this family indicates that the developing heart is more sensitive than the developing liver to reduced JAG1 dosage.\",\n      \"method\": \"Cell fractionation, glycosylation analysis, cell-surface localization, temperature-shift experiments, Notch signaling assay\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal biochemical methods (glycosylation, fractionation, signaling) in a focused mechanistic study\",\n      \"pmids\": [\"12649809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"JAG1 mutations (deletions, truncations, and missense) cause Alagille syndrome primarily through haploinsufficiency, as deletion of the entire gene produces the same phenotype as intragenic truncating mutations. Two missense mutations at the same amino acid residue suggest that mechanisms beyond haploinsufficiency may also exist.\",\n      \"method\": \"SSCP mutation screening, FISH gene deletion analysis, phenotype-genotype correlation in 54 AGS patients/families\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across many families, genotype-phenotype analysis; functional mechanism inferred from deletion = truncation equivalence rather than direct biochemical reconstitution\",\n      \"pmids\": [\"9585603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mind bomb (Mib) ubiquitylates Jagged1 (Jag1) and is required in signal-sending cells for Jag1 to activate Notch signaling. In zebrafish, Mib-Jag1-Notch signaling governs cell-fate decisions between vacuolated and non-vacuolated notochord cells, affecting peri-notochordal basement membrane formation.\",\n      \"method\": \"Zebrafish loss-of-function and gain-of-function genetics, ubiquitylation assay, in vivo imaging\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct biochemical ubiquitylation assay combined with in vivo genetic epistasis in zebrafish\",\n      \"pmids\": [\"20573700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"JAG1 missense mutations associated with right-sided cardiac defects (TOF, PS) display heterogeneous effects on protein localization, post-translational modification, and Notch signaling activation, with some behaving as complete haploinsufficiency alleles, indicating that additional tissue-specific modifiers influence organ-specific phenotypes.\",\n      \"method\": \"Protein localization assays, post-translational modification analysis, Notch signaling reporter assay in patient-derived missense mutants\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays for four missense variants, single lab\",\n      \"pmids\": [\"20437614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"JAG1 is upregulated in adrenocortical carcinoma (ACC) and enhances cell proliferation through activation of canonical Notch signaling in a non-cell-autonomous (juxtacrine) manner; JAG1 knockdown and inhibition of post-receptor Notch signaling (DNMaml) both reduce proliferation equivalently.\",\n      \"method\": \"Jag1 shRNA knockdown, co-culture FACS proliferation assay, luciferase Notch reporter, immunoblot, QPCR\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and dominant-negative signaling inhibition with defined proliferative readout, single lab\",\n      \"pmids\": [\"22427350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Sertoli cells, JAG1 expressed on the surface of spermatogonial stem/progenitor cells activates canonical NOTCH signaling in Sertoli cells; NOTCH targets HES1 and HEY1 directly bind the Gdnf promoter and repress GDNF expression, establishing a negative feedback loop that limits stem cell self-renewal.\",\n      \"method\": \"Double-mutant mouse model, dual luciferase assay, ChIP-qPCR, in vitro co-culture\",\n      \"journal\": \"Stem cells and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — ChIP-qPCR + luciferase + genetic double mutant in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"28051360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In colorectal cancer with mutant Kras, KRAS/ERK/ADAM17 signaling drives constitutive cleavage of Jagged1, releasing the intracellular domain (Jag1-ICD), which translocates to the nucleus and drives tumor growth, EMT, and chemoresistance via a non-canonical reverse signaling mechanism independent of trans-Notch activation.\",\n      \"method\": \"In vitro cleavage assays, nuclear fractionation, gain/loss-of-function experiments in vitro and xenograft models, pharmacologic ADAM17 inhibition\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — biochemical cleavage/fractionation plus in vitro and in vivo functional assays, multiple orthogonal methods in one study\",\n      \"pmids\": [\"31506332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The JAG1 intracellular domain (JICD1), generated by proteolytic processing analogous to NOTCH1, acts as a transcriptional cofactor by forming a complex with DDX17, SMAD3, and TGIF2, increasing SOX2 expression and driving astrocyte transformation toward cancer stem cell properties (tumor formation, invasiveness, stemness, therapy resistance).\",\n      \"method\": \"Transcriptome analysis, ChIP-seq, proteomics, gain-of-function, SOX2 rescue experiments\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP-seq + proteomics + transcriptomics + functional rescue, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"36417870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Disturbed blood flow activates the JAG1-NOTCH4 signaling pathway in endothelial cells; EC-specific genetic deletion of Jag1 reduces atherosclerosis at sites of disturbed flow. Single-cell RNA sequencing shows Jag1 suppresses proliferating/migrating EC subsets, establishing JAG1 as a pro-atherogenic mechanosensor.\",\n      \"method\": \"EC-specific Jag1 knockout mice, porcine/murine artery models, human coronary artery EC culture, light-sheet imaging, scRNA-seq\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — EC-specific conditional KO in mice + human cell culture + scRNA-seq + light-sheet imaging, replicated across species\",\n      \"pmids\": [\"36044575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Jag1 and Dll4 exert antagonistic roles in coronary arterial development: endocardial Jag1 removal blocks sinus venosus capillary sprouting (primary plexus formation), while Dll4 inactivation stimulates excessive capillary growth. EphrinB2 is a critical downstream effector of the antagonistic Dll4-Jag1 functions in arterial morphogenesis, epistatic rescue experiments confirming this cascade.\",\n      \"method\": \"Conditional endocardial Jag1 and Dll4 knockout mice, Mfng forced expression, ventricular explant angiogenic rescue, primary human EC experiments\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple conditional KO alleles + rescue experiments in vivo and in vitro, epistasis established across species\",\n      \"pmids\": [\"31789590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Jag1, uniformly expressed in multipotent pancreatic progenitors (MPCs), restrains MPC growth. When Jag1 expression later segregates to pro-acinar cells, it becomes critical for bipotent progenitor specification; Jag1;Dll1 double mutants lose all bipotent progenitors. Jag1 modulates oscillating Hes1 activity to coordinate MPC growth and fate.\",\n      \"method\": \"Conditional Jag1 knockout mice, Jag1;Dll1 double mutants, Hes1 oscillation imaging, lineage tracing\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO, double mutant epistasis, and live oscillation imaging across developmental stages\",\n      \"pmids\": [\"32059775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SNX17 binds Jag1a and promotes retromer-dependent recycling of Jag1a to the plasma membrane in ligand-expressing cells, thereby maintaining Jag1a protein levels at the cell surface and enabling Notch signaling activation; inhibition of this pathway impairs neurogenesis and pancreas development in zebrafish.\",\n      \"method\": \"Co-IP, zebrafish knockdown, cell-surface protein assays, genetic epistasis in zebrafish\",\n      \"journal\": \"Cell regeneration\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP binding plus in vivo zebrafish functional assay, single lab\",\n      \"pmids\": [\"25408867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"JAG1 mediates pro-proliferative and pro-survival signaling in medulloblastoma via activation of NOTCH2 receptor and induction of HES1 expression; JAG1 knockdown reduces MB cell survival.\",\n      \"method\": \"shRNA knockdown, Notch signaling reporter, HES1 expression analysis in MB cell lines and primary tumor cohorts\",\n      \"journal\": \"Acta neuropathologica communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined signaling and proliferative readout, single lab\",\n      \"pmids\": [\"24708907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In the tracheobronchial epithelium, JAG1 undergoes posttranslational processing by the γ-secretase complex (GSC) generating a C-terminal peptide, and GSC also regulates abundance of full-length JAG2 at the cell surface. These PTMs create distinct JAG1/JAG2 assemblies that regulate Notch signal strength and determine goblet vs. ciliated cell fate via a WNT-independent mechanism.\",\n      \"method\": \"GSC inhibitor treatment, neutralizing peptides/antibodies, biochemical fractionation, RNA-Seq, WNT agonist/antagonist studies in human air-liquid-interface cultures\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacologic perturbations + RNA-Seq, single lab\",\n      \"pmids\": [\"35819850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HOXA5 directly binds the JAG1 gene promoter and represses its transcription; loss of HOXA5 via DNA methylation in kidney fibrosis de-represses JAG1, activating JAG1-NOTCH signaling and promoting fibrogenesis. Conditional Hoxa5 KO aggravates fibrosis; conditional Hoxa5 knockin suppresses it.\",\n      \"method\": \"ChIP (HOXA5 on Jag1 promoter), conditional KO and knockin mice, 5-Aza treatment, genome-wide methylation analysis\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct ChIP of transcription factor on JAG1 promoter + conditional KO and knockin in vivo + pharmacologic validation\",\n      \"pmids\": [\"38521405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In T-ALL, leukemia-derived small extracellular vesicles activate PERK-eIF2a-ATF4 signaling in bone marrow endothelial cells; ATF4 directly upregulates JAG1 transcription (confirmed by ChIP), remodeling the vascular niche. EC-specific PERK deletion abolishes aberrant JAG1 upregulation, improves HSC maintenance, and improves leukemia survival.\",\n      \"method\": \"ChIP (ATF4 on JAG1), EC-specific PERK knockout mice, small extracellular vesicle characterization, transcriptomic analysis, xenograft models\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — ChIP mechanistic link + EC-specific conditional KO + SEV mechanistic studies + human T-ALL validation\",\n      \"pmids\": [\"35401837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Soluble, multivalent Jag1 presented on DNA origami nanostructures activates Notch signaling in neuroepithelial stem-like cells without requiring a pulling force, demonstrating that prolonged multivalent Jag1 binding is sufficient for Notch activation in the absence of mechanical force.\",\n      \"method\": \"DNA origami nanopattern display of Jag1, Notch signaling reporter assays, chimeric ligand controls ruling out confounders\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — molecularly precise reconstitution with multiple chimeric controls, single lab but rigorous mechanistic design\",\n      \"pmids\": [\"38238313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Oocyte-expressed JAG1 activates Notch signaling in ovarian granulosa cells: germ cell ablation or oocyte-specific Jag1 deletion suppresses Notch activation in granulosa cells, and recombinant JAG1 enhances Notch target gene expression in granulosa cells in vitro.\",\n      \"method\": \"Transgenic Notch reporter mice, busulfan germ cell ablation, KitWv/Wv mice, oocyte-specific Jag1 conditional KO, recombinant JAG1 treatment of granulosa cells\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (conditional KO, germ cell ablation, KitWv) plus recombinant protein rescue, all pointing to same conclusion\",\n      \"pmids\": [\"31609444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In ATL cells, JAG1 overexpression is driven by the HTLV-1 viral protein Tax and cellular factors miR-124a, STAT3, and NFATc1. Blockade of JAG1 signaling by shRNA knockdown or neutralizing antibodies dampens Notch1 downstream signaling and limits cell migration of ATL cells.\",\n      \"method\": \"RT-PCR, FACS, IHC, shRNA knockdown, neutralizing antibodies, Notch signaling analysis\",\n      \"journal\": \"Journal of hematology & oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD plus neutralizing antibody with defined signaling and migration readout, single lab\",\n      \"pmids\": [\"30231940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"JAG1 membrane localization (but not cytoplasmic localization) in HCC is associated with extrahepatic metastasis and correlates with Notch1 membrane localization; JAG1 or Notch1 knockdown reduces osteopontin (OPN) expression in HCC cells, placing JAG1/Notch1/OPN in a functional cascade regulating metastasis.\",\n      \"method\": \"Tissue microarray localization (112 tumors), RNA interference of JAG1 and Notch1, OPN expression measurement\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — RNAi functional assay plus spatial localization in tissue array, single lab\",\n      \"pmids\": [\"25176314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"JAG1 in normal epidermal cells activates Notch1 in senescent cells and is required for their removal from the basal layer; JAG1 knockdown in normal cells or Notch signaling inhibition suppresses preferential removal of senescent cells from the basal layer in 3D reconstructed epidermis.\",\n      \"method\": \"3D reconstructed epidermis with mixed normal and UVB-senescent cells, JAG1 siRNA knockdown, Notch inhibitor treatment, FACS and microscopy\",\n      \"journal\": \"Experimental dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and pharmacologic inhibition in 3D model with defined cellular readout, single lab\",\n      \"pmids\": [\"33891780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FAS receptor controls JAG1 expression and NOTCH pathway activity through ERK phosphorylation in OSCC cells; FAS ligand or recombinant JAG1 protein treatment increases NOTCH activity, and this is abolished by FAS receptor knockout. NOTCH1 intracellular domain rescues spheroid formation in FAS KO cells, placing FAS-ERK-JAG1-NOTCH1 in a linear cascade.\",\n      \"method\": \"FAS receptor knockout, cDNA microarray, phosphoprotein arrays, NOTCH1-ICD rescue, pharmacologic ERK inhibition, in vivo xenograft\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO + rescue experiment + pharmacologic confirmation, single lab\",\n      \"pmids\": [\"35249111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Jag1-mediated cis-inhibition of Notch receptors in multipotent pancreatic progenitors is a cell-autonomous mechanism that drives exit from the multipotent state; a mathematical model validated against Jag1 and Dll1 KO mice and small molecule Notch inhibitors shows cis-interaction is required for MPC differentiation while trans-interaction is required for bipotent fate adoption.\",\n      \"method\": \"Mathematical modeling validated against conditional KO mice (Jag1, Dll1), small molecule Notch pathway inhibitors, comparison with published mutant phenotypes\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — computational model validated against multiple genetic KOs and pharmacological perturbations, single lab; model-based inference limits confidence\",\n      \"pmids\": [\"36681690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IGF2BP3 (an m6A reader) binds and stabilizes Jag1 mRNA; IGF2BP3 knockout reduces m6A content and expression of Jag1 and downstream Hes1 in hepatic stellate cells, decreasing GPX4 and promoting HSC ferroptosis to reduce liver fibrosis.\",\n      \"method\": \"IGF2BP3 KO mice (HSC-specific), m6A multi-omics, Hes1/GPX4 measurement, ferroptosis assays\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with m6A profiling and functional ferroptosis readout, single lab\",\n      \"pmids\": [\"39113232\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"JAG1 is a transmembrane Notch pathway ligand that activates Notch receptors in adjacent cells (trans-activation) via a mechanism requiring endocytic recycling (SNX17/retromer) and ubiquitylation by Mind bomb; its intracellular domain (JICD1/Jag1-ICD) can also be proteolytically released by ADAM17/γ-secretase and act as a nuclear transcriptional cofactor (with DDX17/SMAD3/TGIF2) driving oncogenic transformation, while its surface localization, glycosylation, and signaling capacity are disrupted by disease-causing missense mutations that cause ER retention; JAG1 expression is transcriptionally repressed by HOXA5 and induced by ATF4, and its activity is modulated by posttranslational processing to generate distinct molecular assemblies that tune Notch signal strength and cell-fate outcomes in multiple tissues including pancreas, ovary, testis, heart, and endothelium.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"JAG1 is a transmembrane Notch pathway ligand that activates Notch receptors on adjacent cells to control cell-fate decisions across diverse tissues including pancreas, ovary, testis, heart, vasculature, and epidermis [#11, #18, #6, #10, #21]. Productive trans-activation depends on events in the signal-sending cell: ubiquitylation by Mind bomb is required for Jag1 to activate Notch [#3], and SNX17/retromer-dependent endocytic recycling maintains surface Jag1 levels to sustain signaling [#12]; multivalent Jag1 presentation is sufficient to activate Notch even in the absence of mechanical pulling force [#17]. Through this axis JAG1 engages NOTCH1, NOTCH2, and NOTCH4 receptors and drives canonical HES1/HEY1 target induction that governs context-specific outcomes—repressing GDNF in a Sertoli-cell feedback loop limiting spermatogonial self-renewal [#6], restraining and then specifying pancreatic progenitor fate via modulation of oscillating Hes1, with parallel cell-autonomous cis-inhibition driving exit from multipotency [#11, #23], and acting as a pro-atherogenic mechanosensor at sites of disturbed flow in antagonism with Dll4 during coronary morphogenesis [#9, #10]. Independently of trans-Notch signaling, the JAG1 intracellular domain is liberated by ADAM17/\\u03b3-secretase processing and translocates to the nucleus, where as JICD1 it partners with DDX17, SMAD3, and TGIF2 to induce SOX2 and drive oncogenic transformation, EMT, and therapy resistance [#7, #8]. Disease-causing missense mutations disrupt JAG1 glycosylation and cell-surface trafficking, causing ER retention and loss of signaling, establishing haploinsufficiency and defective intracellular transport as the basis of Alagille syndrome and associated cardiac defects [#0, #1, #2]. JAG1 expression is itself tightly controlled, being directly repressed by HOXA5 and induced by ATF4 [#15, #16].\"\n  ,\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established the genetic basis of Alagille syndrome by showing that whole-gene deletion phenocopies intragenic truncations, defining JAG1 haploinsufficiency as the disease mechanism.\",\n      \"evidence\": \"SSCP mutation screening and FISH deletion analysis with genotype-phenotype correlation across 54 AGS families\",\n      \"pmids\": [\"9585603\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism inferred from deletion=truncation equivalence rather than biochemical reconstitution\", \"Does not explain the basis of organ-specific phenotypic variability\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Resolved how missense mutations cause disease by demonstrating that pathogenic variants abolish glycosylation and surface delivery, retaining JAG1 intracellularly and ablating Notch signaling, distinguishing true mutations from polymorphisms.\",\n      \"evidence\": \"Cell-surface localization, glycosylation analysis, and Notch reporter assays with site-directed mutagenesis\",\n      \"pmids\": [\"11157803\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the trafficking machinery responsible for ER retention\", \"Does not address dosage thresholds across tissues\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Explained organ-specific sensitivity by showing a temperature-sensitive missense allele yields mixed functional/non-functional protein populations and that the heart tolerates reduced JAG1 dosage less than the liver.\",\n      \"evidence\": \"Cell fractionation, glycosylation, temperature-shift, and signaling assays in a cardiac-phenotype family\",\n      \"pmids\": [\"12649809\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of tissue-specific dosage sensitivity not defined\", \"Modifier genes not identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Mind bomb ubiquitylation of Jag1 in signal-sending cells as a required step for ligand-dependent Notch activation, linking ligand endocytosis to signaling competence and to notochord cell-fate decisions.\",\n      \"evidence\": \"Zebrafish loss/gain-of-function genetics, ubiquitylation assay, and in vivo imaging\",\n      \"pmids\": [\"20573700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitylation site mapping not defined\", \"Did not address how ubiquitylation couples to endocytic pulling force\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the trafficking pathway that sustains ligand signaling, showing SNX17 binds Jag1 and drives retromer-dependent recycling to the surface to maintain Notch-activating ligand levels.\",\n      \"evidence\": \"Co-IP, zebrafish knockdown, cell-surface protein assays, and genetic epistasis\",\n      \"pmids\": [\"25408867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP without reciprocal structural validation\", \"Recycling kinetics and human relevance not established\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed JAG1 acts in a juxtacrine manner to drive proliferation through canonical Notch signaling in adrenocortical carcinoma, an early demonstration of its oncogenic trans-activating role.\",\n      \"evidence\": \"shRNA knockdown, co-culture proliferation assay, Notch reporter, immunoblot\",\n      \"pmids\": [\"22427350\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor identity not specified\", \"Downstream target genes not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended JAG1's pro-tumor role across cancer types, linking it to NOTCH2/HES1 survival signaling in medulloblastoma and to a NOTCH1/osteopontin metastatic cascade dependent on membrane localization in HCC.\",\n      \"evidence\": \"shRNA/RNAi knockdown, Notch reporter and HES1 readout in MB lines; tissue microarray localization and OPN measurement in HCC\",\n      \"pmids\": [\"24708907\", \"25176314\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causality between membrane localization and metastasis correlative\", \"Receptor selectivity mechanism unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed a tissue feedback circuit in which spermatogonial JAG1 activates Sertoli-cell Notch, whose targets HES1/HEY1 directly repress Gdnf to limit stem-cell self-renewal.\",\n      \"evidence\": \"Double-mutant mice, dual luciferase, ChIP-qPCR, and co-culture\",\n      \"pmids\": [\"28051360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution to germline homeostasis in vivo not measured\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Uncovered a non-canonical reverse-signaling mechanism: KRAS/ERK/ADAM17 cleaves Jagged1 to release a nuclear Jag1-ICD that drives tumor growth, EMT, and chemoresistance independent of trans-Notch activation.\",\n      \"evidence\": \"In vitro cleavage assays, nuclear fractionation, gain/loss-of-function, xenografts, and ADAM17 inhibition\",\n      \"pmids\": [\"31506332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear partners of Jag1-ICD not identified in this study\", \"Direct transcriptional targets not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined antagonistic ligand functions in vascular morphogenesis, with endocardial Jag1 required for capillary sprouting opposing Dll4, converging on EphrinB2 as a downstream effector.\",\n      \"evidence\": \"Conditional Jag1/Dll4 KO mice, Mfng forced expression, explant rescue, and human EC experiments\",\n      \"pmids\": [\"31789590\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Fringe-dependent ligand discrimination not fully resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established an oocyte-to-somatic signaling role for JAG1 in the ovary, where germ-cell-expressed JAG1 activates Notch in granulosa cells.\",\n      \"evidence\": \"Notch reporter mice, germ cell ablation, KitWv/Wv mice, oocyte-specific Jag1 KO, and recombinant JAG1 rescue\",\n      \"pmids\": [\"31609444\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor and downstream granulosa targets not detailed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Dissected dual roles in pancreatic development, showing Jag1 restrains progenitor growth and, upon segregation to pro-acinar cells, is required for bipotent progenitor specification by modulating oscillating Hes1.\",\n      \"evidence\": \"Conditional Jag1 KO, Jag1;Dll1 double mutants, Hes1 oscillation imaging, and lineage tracing\",\n      \"pmids\": [\"32059775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Jag1 expression segregation is controlled not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified the nuclear cofactor complex through which the JAG1 intracellular domain drives transformation, showing JICD1 binds DDX17/SMAD3/TGIF2 to induce SOX2 and confer cancer-stem-cell properties.\",\n      \"evidence\": \"ChIP-seq, proteomics, transcriptomics, gain-of-function, and SOX2 rescue\",\n      \"pmids\": [\"36417870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structure of the JICD1 complex unresolved\", \"Generality beyond astrocyte transformation untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established JAG1 as a pro-atherogenic endothelial mechanosensor, with disturbed flow activating JAG1-NOTCH4 and suppressing proliferative/migratory EC subsets.\",\n      \"evidence\": \"EC-specific Jag1 KO mice, multi-species artery models, human EC culture, light-sheet imaging, scRNA-seq\",\n      \"pmids\": [\"36044575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanotransduction step linking flow to JAG1 not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed \\u03b3-secretase processing generates distinct JAG1/JAG2 molecular assemblies that tune Notch signal strength and goblet versus ciliated cell fate in airway epithelium.\",\n      \"evidence\": \"GSC inhibition, neutralizing peptides/antibodies, fractionation, RNA-Seq in air-liquid-interface cultures\",\n      \"pmids\": [\"35819850\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity and function of the C-terminal peptide product unclear\", \"Single-lab pharmacologic perturbations\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mapped upstream regulation of JAG1 expression in distinct contexts: ATF4 directly transactivates JAG1 to remodel the leukemic vascular niche, and FAS-ERK signaling controls JAG1 in a linear FAS-ERK-JAG1-NOTCH1 oncogenic cascade.\",\n      \"evidence\": \"ChIP (ATF4 on JAG1), EC-specific PERK KO mice, SEV studies in T-ALL; FAS KO, phosphoprotein arrays, NOTCH1-ICD rescue in OSCC\",\n      \"pmids\": [\"35401837\", \"35249111\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cross-talk between transcriptional regulators of JAG1 not integrated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Distinguished cis from trans Jag1 functions in pancreatic fate, with cis-inhibition of Notch driving multipotency exit and trans-interaction required for bipotent fate.\",\n      \"evidence\": \"Mathematical modeling validated against Jag1/Dll1 KO mice and small-molecule Notch inhibitors\",\n      \"pmids\": [\"36681690\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Model-based inference limits mechanistic confidence\", \"Molecular basis of cis versus trans engagement not biochemically resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated that prolonged multivalent ligand binding is sufficient for Notch activation, decoupling JAG1-driven signaling from mechanical pulling force.\",\n      \"evidence\": \"DNA origami nanopattern display of soluble Jag1 with chimeric ligand controls and Notch reporters\",\n      \"pmids\": [\"38238313\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between force-independent and endocytosis-dependent activation in vivo unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined post-transcriptional and transcriptional control of JAG1 in fibrosis: HOXA5 directly represses JAG1 (lost via DNA methylation in kidney fibrosis), and the m6A reader IGF2BP3 stabilizes Jag1 mRNA to sustain Hes1/GPX4 and suppress hepatic stellate cell ferroptosis.\",\n      \"evidence\": \"ChIP and conditional KO/knockin mice with 5-Aza (HOXA5 axis); IGF2BP3 KO mice with m6A multi-omics and ferroptosis assays (HSC axis)\",\n      \"pmids\": [\"38521405\", \"39113232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of methylation, m6A, and transcription factor inputs on JAG1 unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the distinct JAG1 modes—force-dependent trans-activation, force-independent multivalent activation, cis-inhibition, and nuclear JICD1 reverse signaling—are coordinately selected within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model integrating trafficking, cleavage, and receptor engagement modes\", \"Structural basis of JICD1 cofactor complex unknown\", \"Determinants of receptor (NOTCH1/2/4) selectivity undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [3, 6, 17, 18]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 12, 20]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 6, 11, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [10, 11, 18]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 2, 7, 9]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 15, 16]}\n    ],\n    \"complexes\": [\"JICD1-DDX17-SMAD3-TGIF2 transcriptional complex\"],\n    \"partners\": [\"NOTCH1\", \"NOTCH2\", \"NOTCH4\", \"MIB1\", \"SNX17\", \"DDX17\", \"SMAD3\", \"TGIF2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}