{"gene":"JAG1","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":1997,"finding":"JAG1 was identified and cloned as the human homolog of rat Jagged1, localized to chromosome 20p12 within the Alagille syndrome critical region, and shown to encode a Notch ligand expressed during development.","method":"CpG island cloning, full-length cDNA cloning, expression analysis, physical mapping","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — original identification with structural and positional data, foundational paper","pmids":["9268641"],"is_preprint":false},{"year":1998,"finding":"Loss-of-function mutations (deletions, frameshifts, nonsense, splice-site, and missense) distributed across JAG1 cause Alagille syndrome, with haploinsufficiency established as the primary disease mechanism since total gene deletions phenocopy intragenic mutations.","method":"SSCP mutation screening, FISH for whole-gene deletions, genotype-phenotype correlation in 54 AGS probands","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — large patient cohort, multiple mutation classes tested, replicated across labs","pmids":["9585603"],"is_preprint":false},{"year":2001,"finding":"Missense mutations R184H and L37S in JAG1 cause defective intracellular transport: the mutant proteins are abnormally glycosylated, retained intracellularly (likely in the ER), fail to reach the cell surface, and lose Notch signaling activity; two other missense changes (P163L, P871R) retain normal glycosylation, surface localization, and signaling, indicating they are polymorphisms.","method":"Cell-surface expression assays, glycosylation analysis, Notch signaling reporter assays, immunofluorescence localization","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal functional assays (glycosylation, localization, signaling), mechanistic conclusions supported by mutagenesis","pmids":["11157803"],"is_preprint":false},{"year":2003,"finding":"The JAG1-G274D missense mutation produces two protein populations: one abnormally glycosylated and retained intracellularly, and one normally glycosylated that reaches the cell surface and signals to Notch; this leaky allele yields >50% but <100% surface JAG1, and the cardiac-specific phenotype demonstrates the developing heart is more sensitive than liver to reduced JAG1 dosage.","method":"Glycosylation analysis, cell-surface expression assays, Notch reporter assays, temperature-sensitivity experiments, genotype-phenotype analysis in 13-member family","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1-2 — multiple biochemical assays plus clinical correlation, mechanistic model validated in vitro and in vivo","pmids":["12649809"],"is_preprint":false},{"year":2010,"finding":"Mind bomb (Mib) ubiquitylates Jagged1 (Jag1) in signal-emitting cells and is essential for Jag1 to activate Notch signaling; in zebrafish, Mib-Jag1-Notch signaling controls cell-fate decisions between vacuolated and non-vacuolated notochord cells, affecting basement membrane formation and muscle pioneer patterning.","method":"Zebrafish loss- and gain-of-function genetics, ubiquitylation assays, live imaging","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in vivo, biochemical ubiquitylation assay, ortholog study consistent with mammalian JAG1 biology","pmids":["20573700"],"is_preprint":false},{"year":2010,"finding":"JAG1 missense mutations identified in tetralogy of Fallot and pulmonic stenosis patients display heterogeneous effects on protein localization, post-translational modification (glycosylation), and Notch signaling activation, with some acting through complete haploinsufficiency and others retaining partial function.","method":"Protein localization assays, glycosylation analysis, Notch signaling reporter assays in cell lines","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 2 — multiple functional assays on four missense mutants, mechanistically informative","pmids":["20437614"],"is_preprint":false},{"year":2011,"finding":"JAG1-induced Notch signaling directly transcriptionally activates urokinase plasminogen activator (uPA) in breast cancer cells via a CBF-1 binding site in the uPA promoter, linking JAG1-Notch to the plasminogen activator system and cancer progression.","method":"siRNA knockdown, microarray profiling, luciferase promoter mutational analysis, CBF-1 binding site identification","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — promoter mutagenesis identifies functional CBF-1 site, knockdown phenocopies uPA knockdown, multiple orthogonal methods","pmids":["21199807"],"is_preprint":false},{"year":2012,"finding":"JAG1-mediated Notch signaling is required for lens vesicle separation from the surface ectoderm during mouse lens development, demonstrated by AP2α-Cre-driven conditional deletion of Jag1 or Rbpj.","method":"Conditional knockout mouse, Cre-lox genetics, histological analysis","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with defined morphogenetic phenotype","pmids":["22275127"],"is_preprint":false},{"year":2012,"finding":"JAG1 is the primary upregulated Notch ligand in adrenocortical carcinoma (ACC) and enhances cell proliferation in a non-cell-autonomous manner through activation of canonical Notch signaling in adjacent cells, as demonstrated by JAG1 knockdown and dominant-negative MAML (DNMaml) inhibition.","method":"JAG1 knockdown (shRNA), co-culture FACS proliferation assay, Notch reporter (luciferase), DNMaml inhibition","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal approaches in cell culture plus clinical correlation","pmids":["22427350"],"is_preprint":false},{"year":2012,"finding":"SNX17, a sorting nexin, binds to Jag1 and promotes retromer-dependent recycling of Jag1 to the plasma membrane, thereby regulating Notch pathway activity and cell fate in zebrafish neurogenesis and pancreas development.","method":"Biochemical binding assays, zebrafish genetics, vesicular trafficking assays","journal":"Cell regeneration (London, England)","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding and recycling mechanism established in zebrafish ortholog model","pmids":["25408867"],"is_preprint":false},{"year":2014,"finding":"JAG1 mediates pro-proliferative signals in medulloblastoma via activation of NOTCH2 receptor and induction of HES1 expression.","method":"JAG1 knockdown, Notch reporter assays, expression profiling of MB tumor cohorts","journal":"Acta neuropathologica communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD with signaling readout, single lab","pmids":["24708907"],"is_preprint":false},{"year":2015,"finding":"HCMV infection downregulates Jag1 protein levels and alters its intracellular localization in neural progenitor cells through enhanced proteasomal degradation; viral tegument proteins pp71 and UL26 reduce both NICD1 and Jag1 protein levels, disrupting Notch signaling.","method":"Viral infection experiments, immunofluorescence localization, proteasome inhibitor rescue, transient expression of viral proteins","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2-3 — mechanistic dissection with localization and degradation assays, single lab","pmids":["25903338"],"is_preprint":false},{"year":2016,"finding":"JAG1-mediated Notch signaling regulates differentiation of basal stem/progenitor cells into secretory cells in the human airway epithelium; JAG1 overexpression increases secretory cell differentiation while JAG1 knockdown decreases secretory cell gene expression without affecting ciliated cell differentiation.","method":"JAG1 overexpression and siRNA knockdown in human airway basal cells, air-liquid-interface culture, gene expression analysis","journal":"Stem cell reviews and reports","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional gain/loss-of-function with specific cell fate readout, single lab","pmids":["27216293"],"is_preprint":false},{"year":2017,"finding":"In Sertoli cells, JAG1 expressed on spermatogonial stem/progenitor cells activates Notch signaling, leading to HES1 and HEY1 transcriptional repressors binding the Gdnf promoter and directly downregulating GDNF expression, thereby creating a negative feedback on SSC 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 — ChIP directly shows HES1/HEY1 binding to Gdnf promoter, double-mutant confirms canonical pathway, multiple orthogonal methods","pmids":["28051360"],"is_preprint":false},{"year":2019,"finding":"In colorectal cancer with mutant KRAS, ADAM17 downstream of KRAS/ERK signaling cleaves JAG1 to generate a nuclear-targeted intracellular domain (Jag1-ICD) that acts as a transcriptional co-factor to promote EMT, tumor growth, and chemoresistance independent of canonical Notch activation.","method":"In vitro and in vivo tumor models, KRAS/ADAM17 inhibition, Jag1-ICD nuclear translocation assays, EMT/chemoresistance phenotypic assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — identifies KRAS→ADAM17→Jag1-ICD axis with in vitro and in vivo validation, noncanonical nuclear mechanism demonstrated","pmids":["31506332"],"is_preprint":false},{"year":2019,"finding":"In the developing coronary vasculature, JAG1 and DLL4 act as antagonistic Notch ligands: endocardial JAG1 removal blocks sinus venosus capillary sprouting, while forced DLL4 or Mfng expression blocks arterial differentiation; EphrinB2 is identified as a critical downstream effector of the Dll4-Jag1 antagonism in arterial morphogenesis.","method":"Conditional endocardial knockout mice, forced expression, ventricular explant angiogenic rescue, primary human endothelial cell assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — multiple conditional KO models, rescue experiments, epistasis establishing Dll4-Jag1-EphrinB2 cascade","pmids":["31789590"],"is_preprint":false},{"year":2019,"finding":"In the ovary, oocyte-expressed JAG1 is necessary for activation of Notch signaling in granulosa cells; oocyte ablation or oocyte-specific Jag1 deletion suppresses Notch reporter activity in granulosa cells, and recombinant JAG1 enhances Notch target gene expression in granulosa cells.","method":"Transgenic Notch reporter mice, germ cell ablation (busulfan), KitWv/Wv mice, oocyte-specific Jag1 conditional KO, recombinant JAG1 treatment","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic models plus recombinant ligand rescue, specific cell-to-cell signaling established","pmids":["31609444"],"is_preprint":false},{"year":2020,"finding":"In developing pancreas, JAG1 expressed in pro-acinar cells (PACs) is critical for specification of bipotent progenitors (BPs); Jag1 restrains MPC growth, and Jag1;Dll1 double mutants completely lose BPs, demonstrating that JAG1 modulates oscillating Dll1-Notch-Hes1 signaling to coordinate progenitor fate.","method":"Conditional knockout mice (Jag1, Dll1, double mutants), live imaging of Hes1 oscillations, lineage tracing","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — clean genetic epistasis with double mutant, live oscillation imaging, multiple progenitor fate readouts","pmids":["32059775"],"is_preprint":false},{"year":2022,"finding":"The JAG1 intracellular domain (JICD1), generated by proteolytic processing analogous to NICD formation, acts as a transcriptional cofactor by forming a complex with DDX17, SMAD3, and TGIF2, increasing SOX2 expression and inducing oncogenic transformation including tumor formation, invasiveness, stemness, and therapy resistance in astrocytes.","method":"ChIP-seq, transcriptome analysis, proteomics, co-IP, functional in vitro/in vivo tumor assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-seq, proteomics, and co-IP identify complex; functional oncogenic role validated in vitro and in vivo with 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, and single-cell RNA sequencing shows Jag1 suppresses EC subsets that proliferate and migrate, establishing JAG1-NOTCH4 as a mechanosensing pathway promoting atherosclerosis.","method":"EC-specific Jag1 conditional KO mice, porcine/murine artery models, light-sheet imaging, single-cell RNA sequencing","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with clear atherosclerosis phenotype, scRNA-seq mechanistic characterization, multiple model systems","pmids":["36044575"],"is_preprint":false},{"year":2022,"finding":"JAG1 and JAG2 undergo gamma-secretase complex (GSC)-dependent and glycogen synthase kinase 3-dependent post-translational modifications that generate a JAG1 C-terminal peptide and regulate full-length JAG2 abundance on the cell surface, creating distinct assemblies that regulate Notch signal strength and determine tracheobronchial stem/progenitor cell fate.","method":"GSC inhibitors, neutralizing peptides/antibodies, RNA-Seq, biochemical surface expression assays, air-liquid-interface cultures","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2-3 — biochemical characterization of PTMs plus functional cell fate outcomes, mechanism partially elucidated","pmids":["35819850"],"is_preprint":false},{"year":2023,"finding":"Jag1-mediated cis-inhibition of Notch receptors in multipotent pancreatic progenitors is essential for exiting the multipotent state, while Dll1-mediated trans-activation is required for adopting bipotent fate; a mathematical model incorporating cis- and trans-interactions recapitulates in vivo knockout phenotypes.","method":"Mathematical modeling validated against Notch pathway knockout mice, small molecule inhibitor studies, Hes1 oscillation measurements","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — model quantitatively validated against multiple genetic and pharmacological perturbations, mechanistic distinction of cis vs trans interactions","pmids":["36681690"],"is_preprint":false},{"year":2024,"finding":"Soluble, multivalent JAG1 displayed on DNA origami nanopatterns activates Notch signaling in neuroepithelial stem-like cells without requiring a pulling force, challenging the prevailing model that mechanical force is obligatory for Notch receptor activation.","method":"DNA origami nanopattern display, Notch signaling reporter assays in neuroepithelial cells, chimeric ligand controls ruling out confounds","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — molecularly precise reconstitution with multiple controls ruling out confounding factors, directly tests and challenges mechanistic model","pmids":["38238313"],"is_preprint":false},{"year":2024,"finding":"HOXA5 directly binds the JAG1 gene promoter and represses JAG1 transcription; loss of HOXA5 via DNA hypermethylation leads to JAG1 upregulation, consequent NOTCH pathway activation, and kidney fibrosis in mice and humans.","method":"ChIP (HOXA5 binding to JAG1 promoter), conditional Hoxa5 KO and knockin mice, DNA methyltransferase inhibitor 5-Aza, genome-wide methylation analysis","journal":"Kidney international","confidence":"High","confidence_rationale":"Tier 1-2 — direct ChIP evidence of HOXA5-JAG1 promoter binding, validated with conditional KO and knockin in vivo","pmids":["38521405"],"is_preprint":false},{"year":2009,"finding":"KSHV vFLIP induces JAG1 expression through an NF-κB-dependent mechanism in lymphatic endothelial cells, and JAG1-stimulated signaling through NOTCH4 suppresses cell-cycle genes in adjacent cells, promoting cellular quiescence.","method":"KSHV vFLIP/vGPCR expression, NF-κB inhibition, gene expression profiling, Notch signaling assays","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2-3 — NF-κB pathway mechanism defined with inhibitors and gene profiling, single lab","pmids":["19816565"],"is_preprint":false},{"year":2017,"finding":"In HTLV-1-transformed ATL cells, JAG1 overexpression is driven by the viral Tax protein and cellular factors miR-124a, STAT3, and NFATc1; blockade of JAG1 signaling dampens NOTCH1 downstream activity and limits ATL cell migration.","method":"shRNA knockdown, neutralizing antibodies, RT-PCR, FACS, immunohistochemistry, migration assays","journal":"Journal of hematology & oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 — multiple regulatory factors identified, KD phenotype defined, single lab","pmids":["30231940"],"is_preprint":false}],"current_model":"JAG1 is a transmembrane Notch pathway ligand that activates Notch receptors in neighboring cells (trans-activation) and can also undergo cis-inhibition of Notch in the same cell; its activity is regulated by ubiquitylation (by Mib), post-translational glycosylation, retromer-dependent endosomal recycling, and proteolytic processing to generate a nuclear-targeted intracellular domain (JICD1) that acts as a transcriptional cofactor with DDX17/SMAD3/TGIF2; JAG1 surface expression is required for canonical Notch signaling in diverse developmental contexts (heart, liver, pancreas, lens, airway, gonad, vasculature), haploinsufficiency causes Alagille syndrome, and context-dependent JAG1-Notch outputs are determined by ligand dosage, ligand competition with DLL4, mechanosensing (JAG1-NOTCH4 in endothelium), and transcriptional regulation of JAG1 itself by factors including HOXA5, NF-κB, GATA1, and multiple microRNAs."},"narrative":{"teleology":[{"year":1997,"claim":"Identification of JAG1 as a Notch ligand mapping to the Alagille syndrome critical region established the gene as a candidate for a major developmental disorder and anchored it within the Notch signaling framework.","evidence":"CpG island cloning and full-length cDNA characterization with chromosomal mapping to 20p12","pmids":["9268641"],"confidence":"High","gaps":["No functional signaling data at this stage","Causative role in Alagille syndrome not yet proven"]},{"year":1998,"claim":"Demonstration that diverse loss-of-function mutations — including whole-gene deletions — cause Alagille syndrome established haploinsufficiency as the disease mechanism, ruling out dominant-negative effects.","evidence":"SSCP screening and FISH on 54 AGS probands identifying deletions, frameshifts, nonsense, splice-site, and missense mutations","pmids":["9585603"],"confidence":"High","gaps":["Tissue-specific sensitivity to dosage not yet explored","Molecular basis of variable expressivity unknown"]},{"year":2001,"claim":"Functional dissection of disease-associated missense mutations revealed that defective glycosylation and ER retention prevent surface delivery of JAG1, directly linking protein trafficking to loss of Notch signaling activity.","evidence":"Cell-surface expression, glycosylation analysis, Notch reporter assays, and immunofluorescence on R184H and L37S mutants","pmids":["11157803"],"confidence":"High","gaps":["Chaperone/ERAD machinery handling misfolded JAG1 not identified","In vivo trafficking dynamics unresolved"]},{"year":2003,"claim":"Characterization of the leaky G274D allele showed that partial surface delivery produces an intermediate signaling output, and the cardiac-specific phenotype demonstrated the heart's heightened sensitivity to JAG1 dosage — establishing a tissue-specific threshold model.","evidence":"Glycosylation and surface expression assays combined with genotype–phenotype analysis in a 13-member family","pmids":["12649809"],"confidence":"High","gaps":["Molecular basis of tissue-specific dosage sensitivity unknown","Whether other organs have distinct thresholds untested"]},{"year":2010,"claim":"Identification of Mib-dependent ubiquitylation of Jag1 as a prerequisite for trans-activation of Notch resolved how the ligand's endocytic trafficking enables receptor activation in signal-receiving cells.","evidence":"Ubiquitylation assays and genetic epistasis in zebrafish notochord and muscle patterning","pmids":["20573700"],"confidence":"High","gaps":["Specific ubiquitin chain type and lysine sites on JAG1 not mapped","Whether other E3 ligases contribute to JAG1 regulation unresolved"]},{"year":2012,"claim":"Discovery that SNX17 binds Jag1 and promotes retromer-dependent recycling to the plasma membrane revealed a post-endocytic mechanism controlling the pool of signaling-competent JAG1 at the cell surface.","evidence":"Biochemical binding assays and vesicular trafficking assays in zebrafish neurogenesis and pancreas models","pmids":["25408867"],"confidence":"Medium","gaps":["Mammalian validation of SNX17-JAG1 recycling pathway not reported","Whether recycling modulates cis- vs. trans-signaling untested"]},{"year":2012,"claim":"Conditional Jag1 deletion in surface ectoderm demonstrated an essential role for JAG1-Notch signaling in lens vesicle separation, extending JAG1's known developmental functions to eye morphogenesis.","evidence":"AP2α-Cre conditional knockout mouse with histological analysis","pmids":["22275127"],"confidence":"High","gaps":["Downstream targets mediating lens separation not identified","Which Notch receptor is the relevant partner in this context unknown"]},{"year":2017,"claim":"ChIP-qPCR showing HES1/HEY1 binding to the Gdnf promoter downstream of JAG1-Notch signaling in Sertoli cells established a direct transcriptional mechanism by which spermatogonial stem cells create negative feedback on their own niche.","evidence":"Double-mutant mouse model, ChIP-qPCR, dual luciferase assay, and co-culture","pmids":["28051360"],"confidence":"High","gaps":["Whether additional JAG1-dependent targets regulate the niche untested","Quantitative relationship between JAG1 levels and GDNF output not determined"]},{"year":2019,"claim":"Genetic epistasis in coronary vasculature revealed that JAG1 and DLL4 act as antagonistic Notch ligands controlling arterial vs. capillary fate, with EphrinB2 identified as a critical downstream effector — establishing a ligand-competition model for vascular patterning.","evidence":"Multiple conditional endocardial KO mice, ventricular explant rescue, and primary human EC assays","pmids":["31789590"],"confidence":"High","gaps":["How differential receptor glycosylation (Fringe) tunes Jag1 vs. Dll4 preference in coronary ECs not fully defined"]},{"year":2019,"claim":"Discovery that KRAS-driven ADAM17 cleavage of JAG1 generates a nuclear-targeted intracellular domain (Jag1-ICD) that promotes EMT and chemoresistance independently of canonical Notch activation revealed a ligand-intrinsic signaling mode.","evidence":"In vitro and in vivo CRC models with KRAS/ADAM17 inhibition and Jag1-ICD nuclear translocation assays","pmids":["31506332"],"confidence":"High","gaps":["Direct transcriptional targets of Jag1-ICD in CRC not genome-wide mapped","Structural basis of nuclear import undefined"]},{"year":2022,"claim":"ChIP-seq and proteomics defined the JICD1–DDX17–SMAD3–TGIF2 complex as a transcriptional unit driving SOX2 expression and oncogenic transformation, providing the first genome-wide map of JICD1 chromatin occupancy.","evidence":"ChIP-seq, transcriptomics, proteomics, co-IP, and in vitro/in vivo tumor assays in astrocytes","pmids":["36417870"],"confidence":"High","gaps":["Whether JICD1 complex composition varies across cell types unknown","Structural basis of DDX17–JICD1 interaction unresolved"]},{"year":2022,"claim":"Demonstration that JAG1-NOTCH4 signaling is activated by disturbed blood flow and promotes atherosclerosis established JAG1 as a mechanosensing effector in endothelial cells.","evidence":"EC-specific Jag1 conditional KO mice, porcine/murine artery models, light-sheet imaging, and single-cell RNA-seq","pmids":["36044575"],"confidence":"High","gaps":["Mechanosensor upstream of JAG1 induction by disturbed flow not identified","Whether NOTCH4 is the sole receptor in this context not genetically tested"]},{"year":2023,"claim":"Mathematical modeling validated against multiple knockout phenotypes formally distinguished JAG1-mediated cis-inhibition from DLL1-mediated trans-activation in pancreatic progenitors, showing that cis-inhibition drives exit from multipotency.","evidence":"Quantitative model benchmarked against Notch pathway conditional KO mice, inhibitor studies, and Hes1 oscillation measurements","pmids":["36681690"],"confidence":"High","gaps":["Biochemical parameters of cis vs. trans binding affinities in pancreatic cells not directly measured","Whether cis-inhibition operates similarly in non-pancreatic tissues not tested"]},{"year":2024,"claim":"Reconstitution of Notch activation by soluble multivalent JAG1 on DNA origami without pulling force challenged the obligate mechanical-force model, suggesting that ligand clustering alone can suffice for receptor activation.","evidence":"DNA origami nanopattern display with Notch reporter assays in neuroepithelial stem-like cells and chimeric ligand controls","pmids":["38238313"],"confidence":"High","gaps":["Whether force-independent activation occurs in vivo or is an in vitro phenomenon","Threshold valency and spacing requirements not fully defined"]},{"year":2024,"claim":"HOXA5 was shown to directly repress JAG1 transcription, and epigenetic silencing of HOXA5 derepresses JAG1 to promote kidney fibrosis, revealing an upstream transcriptional checkpoint on JAG1 expression.","evidence":"ChIP of HOXA5 at the JAG1 promoter, conditional Hoxa5 KO/knockin mice, and 5-Aza treatment with genome-wide methylation analysis","pmids":["38521405"],"confidence":"High","gaps":["Whether HOXA5 regulates JAG1 in non-renal tissues unknown","Other transcription factors cooperating at the JAG1 promoter not mapped genome-wide"]},{"year":null,"claim":"Key unresolved questions include the structural basis of cis- vs. trans-engagement of Notch receptors by JAG1, the full spectrum of JICD1 nuclear targets and complex partners across cell types, the identity of the mechanosensor upstream of flow-induced JAG1, and whether force-independent Notch activation by multivalent JAG1 occurs in physiological settings.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal structure of JAG1–Notch cis-complex","JICD1 target genes mapped only in astrocytes and CRC","In vivo relevance of force-independent activation untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,4,6,8,13,16]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[21,17]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[14,18]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,3,9,20]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2,3]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[14,18]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,6,8,13,15,16,19,22]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[7,15,17,21]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,5,14,18]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[18,23]}],"complexes":["JICD1-DDX17-SMAD3-TGIF2"],"partners":["NOTCH1","NOTCH2","NOTCH4","MIB1","SNX17","DDX17","SMAD3","TGIF2"],"other_free_text":[]},"mechanistic_narrative":"JAG1 is a transmembrane ligand of the Notch signaling pathway that controls cell-fate decisions across diverse developmental and homeostatic contexts by activating Notch receptors on neighboring cells (trans-activation) and inhibiting Notch receptors within the same cell (cis-inhibition). Surface presentation of JAG1 is essential for signaling and is regulated by glycosylation-dependent ER quality control, Mind bomb (Mib)-mediated ubiquitylation, SNX17/retromer-dependent endosomal recycling, and gamma-secretase/GSK3-dependent proteolytic processing [PMID:11157803, PMID:20573700, PMID:25408867, PMID:35819850]. Beyond canonical Notch activation, proteolytic cleavage of JAG1 generates a nuclear-targeted intracellular domain (JICD1) that forms a transcriptional cofactor complex with DDX17, SMAD3, and TGIF2 to drive SOX2 expression and oncogenic transformation [PMID:36417870, PMID:31506332]. Haploinsufficiency of JAG1 causes Alagille syndrome, and the developing heart is especially sensitive to reduced JAG1 dosage [PMID:9585603, PMID:12649809]."},"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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accelerate angiogenesis in vitro through Notch/JAG1/VEGF signaling.","date":"2023","source":"Tissue & cell","url":"https://pubmed.ncbi.nlm.nih.gov/37595532","citation_count":16,"is_preprint":false},{"pmid":"34067294","id":"PMC_34067294","title":"Circulating PTGS2, JAG1, GUCY2C and PGF mRNA in Peripheral Blood and Serum as Potential Biomarkers for Patients with Metastatic Colon Cancer.","date":"2021","source":"Journal of clinical medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34067294","citation_count":16,"is_preprint":false},{"pmid":"35819850","id":"PMC_35819850","title":"Assemblies of JAG1 and JAG2 determine tracheobronchial cell fate in mucosecretory lung disease.","date":"2022","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/35819850","citation_count":15,"is_preprint":false},{"pmid":"36681690","id":"PMC_36681690","title":"Jag1-Notch cis-interaction determines cell fate segregation in pancreatic development.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/36681690","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":"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":"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":"32475994","id":"PMC_32475994","title":"Ag@S-nitrosothiol core-shell nanoparticles for chemo and photothermal synergistic tumor targeted therapy.","date":"2020","source":"Journal of materials chemistry. 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letters","url":"https://pubmed.ncbi.nlm.nih.gov/29731896","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":"37087470","id":"PMC_37087470","title":"Efficacy and safety of baricitinib in Japanese patients with autoinflammatory type I interferonopathies (NNS/CANDLE, SAVI, And AGS).","date":"2023","source":"Pediatric rheumatology online journal","url":"https://pubmed.ncbi.nlm.nih.gov/37087470","citation_count":13,"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":13,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48419,"output_tokens":5827,"usd":0.116331},"stage2":{"model":"claude-opus-4-6","input_tokens":9443,"output_tokens":3575,"usd":0.204885},"total_usd":0.321216,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"JAG1 was identified and cloned as the human homolog of rat Jagged1, localized to chromosome 20p12 within the Alagille syndrome critical region, and shown to encode a Notch ligand expressed during development.\",\n      \"method\": \"CpG island cloning, full-length cDNA cloning, expression analysis, physical mapping\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — original identification with structural and positional data, foundational paper\",\n      \"pmids\": [\"9268641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Loss-of-function mutations (deletions, frameshifts, nonsense, splice-site, and missense) distributed across JAG1 cause Alagille syndrome, with haploinsufficiency established as the primary disease mechanism since total gene deletions phenocopy intragenic mutations.\",\n      \"method\": \"SSCP mutation screening, FISH for whole-gene deletions, genotype-phenotype correlation in 54 AGS probands\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large patient cohort, multiple mutation classes tested, replicated across labs\",\n      \"pmids\": [\"9585603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Missense mutations R184H and L37S in JAG1 cause defective intracellular transport: the mutant proteins are abnormally glycosylated, retained intracellularly (likely in the ER), fail to reach the cell surface, and lose Notch signaling activity; two other missense changes (P163L, P871R) retain normal glycosylation, surface localization, and signaling, indicating they are polymorphisms.\",\n      \"method\": \"Cell-surface expression assays, glycosylation analysis, Notch signaling reporter assays, immunofluorescence localization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal functional assays (glycosylation, localization, signaling), mechanistic conclusions supported by 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, and one normally glycosylated that reaches the cell surface and signals to Notch; this leaky allele yields >50% but <100% surface JAG1, and the cardiac-specific phenotype demonstrates the developing heart is more sensitive than liver to reduced JAG1 dosage.\",\n      \"method\": \"Glycosylation analysis, cell-surface expression assays, Notch reporter assays, temperature-sensitivity experiments, genotype-phenotype analysis in 13-member family\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple biochemical assays plus clinical correlation, mechanistic model validated in vitro and in vivo\",\n      \"pmids\": [\"12649809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mind bomb (Mib) ubiquitylates Jagged1 (Jag1) in signal-emitting cells and is essential for Jag1 to activate Notch signaling; in zebrafish, Mib-Jag1-Notch signaling controls cell-fate decisions between vacuolated and non-vacuolated notochord cells, affecting basement membrane formation and muscle pioneer patterning.\",\n      \"method\": \"Zebrafish loss- and gain-of-function genetics, ubiquitylation assays, live imaging\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in vivo, biochemical ubiquitylation assay, ortholog study consistent with mammalian JAG1 biology\",\n      \"pmids\": [\"20573700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"JAG1 missense mutations identified in tetralogy of Fallot and pulmonic stenosis patients display heterogeneous effects on protein localization, post-translational modification (glycosylation), and Notch signaling activation, with some acting through complete haploinsufficiency and others retaining partial function.\",\n      \"method\": \"Protein localization assays, glycosylation analysis, Notch signaling reporter assays in cell lines\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays on four missense mutants, mechanistically informative\",\n      \"pmids\": [\"20437614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"JAG1-induced Notch signaling directly transcriptionally activates urokinase plasminogen activator (uPA) in breast cancer cells via a CBF-1 binding site in the uPA promoter, linking JAG1-Notch to the plasminogen activator system and cancer progression.\",\n      \"method\": \"siRNA knockdown, microarray profiling, luciferase promoter mutational analysis, CBF-1 binding site identification\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — promoter mutagenesis identifies functional CBF-1 site, knockdown phenocopies uPA knockdown, multiple orthogonal methods\",\n      \"pmids\": [\"21199807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"JAG1-mediated Notch signaling is required for lens vesicle separation from the surface ectoderm during mouse lens development, demonstrated by AP2α-Cre-driven conditional deletion of Jag1 or Rbpj.\",\n      \"method\": \"Conditional knockout mouse, Cre-lox genetics, histological analysis\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with defined morphogenetic phenotype\",\n      \"pmids\": [\"22275127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"JAG1 is the primary upregulated Notch ligand in adrenocortical carcinoma (ACC) and enhances cell proliferation in a non-cell-autonomous manner through activation of canonical Notch signaling in adjacent cells, as demonstrated by JAG1 knockdown and dominant-negative MAML (DNMaml) inhibition.\",\n      \"method\": \"JAG1 knockdown (shRNA), co-culture FACS proliferation assay, Notch reporter (luciferase), DNMaml inhibition\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches in cell culture plus clinical correlation\",\n      \"pmids\": [\"22427350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SNX17, a sorting nexin, binds to Jag1 and promotes retromer-dependent recycling of Jag1 to the plasma membrane, thereby regulating Notch pathway activity and cell fate in zebrafish neurogenesis and pancreas development.\",\n      \"method\": \"Biochemical binding assays, zebrafish genetics, vesicular trafficking assays\",\n      \"journal\": \"Cell regeneration (London, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding and recycling mechanism established in zebrafish ortholog model\",\n      \"pmids\": [\"25408867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"JAG1 mediates pro-proliferative signals in medulloblastoma via activation of NOTCH2 receptor and induction of HES1 expression.\",\n      \"method\": \"JAG1 knockdown, Notch reporter assays, expression profiling of MB tumor cohorts\",\n      \"journal\": \"Acta neuropathologica communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD with signaling readout, single lab\",\n      \"pmids\": [\"24708907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HCMV infection downregulates Jag1 protein levels and alters its intracellular localization in neural progenitor cells through enhanced proteasomal degradation; viral tegument proteins pp71 and UL26 reduce both NICD1 and Jag1 protein levels, disrupting Notch signaling.\",\n      \"method\": \"Viral infection experiments, immunofluorescence localization, proteasome inhibitor rescue, transient expression of viral proteins\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — mechanistic dissection with localization and degradation assays, single lab\",\n      \"pmids\": [\"25903338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"JAG1-mediated Notch signaling regulates differentiation of basal stem/progenitor cells into secretory cells in the human airway epithelium; JAG1 overexpression increases secretory cell differentiation while JAG1 knockdown decreases secretory cell gene expression without affecting ciliated cell differentiation.\",\n      \"method\": \"JAG1 overexpression and siRNA knockdown in human airway basal cells, air-liquid-interface culture, gene expression analysis\",\n      \"journal\": \"Stem cell reviews and reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional gain/loss-of-function with specific cell fate readout, single lab\",\n      \"pmids\": [\"27216293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Sertoli cells, JAG1 expressed on spermatogonial stem/progenitor cells activates Notch signaling, leading to HES1 and HEY1 transcriptional repressors binding the Gdnf promoter and directly downregulating GDNF expression, thereby creating a negative feedback on SSC 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 — ChIP directly shows HES1/HEY1 binding to Gdnf promoter, double-mutant confirms canonical pathway, multiple orthogonal methods\",\n      \"pmids\": [\"28051360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In colorectal cancer with mutant KRAS, ADAM17 downstream of KRAS/ERK signaling cleaves JAG1 to generate a nuclear-targeted intracellular domain (Jag1-ICD) that acts as a transcriptional co-factor to promote EMT, tumor growth, and chemoresistance independent of canonical Notch activation.\",\n      \"method\": \"In vitro and in vivo tumor models, KRAS/ADAM17 inhibition, Jag1-ICD nuclear translocation assays, EMT/chemoresistance phenotypic assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — identifies KRAS→ADAM17→Jag1-ICD axis with in vitro and in vivo validation, noncanonical nuclear mechanism demonstrated\",\n      \"pmids\": [\"31506332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In the developing coronary vasculature, JAG1 and DLL4 act as antagonistic Notch ligands: endocardial JAG1 removal blocks sinus venosus capillary sprouting, while forced DLL4 or Mfng expression blocks arterial differentiation; EphrinB2 is identified as a critical downstream effector of the Dll4-Jag1 antagonism in arterial morphogenesis.\",\n      \"method\": \"Conditional endocardial knockout mice, forced expression, ventricular explant angiogenic rescue, primary human endothelial cell assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple conditional KO models, rescue experiments, epistasis establishing Dll4-Jag1-EphrinB2 cascade\",\n      \"pmids\": [\"31789590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In the ovary, oocyte-expressed JAG1 is necessary for activation of Notch signaling in granulosa cells; oocyte ablation or oocyte-specific Jag1 deletion suppresses Notch reporter activity in granulosa cells, and recombinant JAG1 enhances Notch target gene expression in granulosa cells.\",\n      \"method\": \"Transgenic Notch reporter mice, germ cell ablation (busulfan), KitWv/Wv mice, oocyte-specific Jag1 conditional KO, recombinant JAG1 treatment\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models plus recombinant ligand rescue, specific cell-to-cell signaling established\",\n      \"pmids\": [\"31609444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In developing pancreas, JAG1 expressed in pro-acinar cells (PACs) is critical for specification of bipotent progenitors (BPs); Jag1 restrains MPC growth, and Jag1;Dll1 double mutants completely lose BPs, demonstrating that JAG1 modulates oscillating Dll1-Notch-Hes1 signaling to coordinate progenitor fate.\",\n      \"method\": \"Conditional knockout mice (Jag1, Dll1, double mutants), live imaging of Hes1 oscillations, lineage tracing\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic epistasis with double mutant, live oscillation imaging, multiple progenitor fate readouts\",\n      \"pmids\": [\"32059775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The JAG1 intracellular domain (JICD1), generated by proteolytic processing analogous to NICD formation, acts as a transcriptional cofactor by forming a complex with DDX17, SMAD3, and TGIF2, increasing SOX2 expression and inducing oncogenic transformation including tumor formation, invasiveness, stemness, and therapy resistance in astrocytes.\",\n      \"method\": \"ChIP-seq, transcriptome analysis, proteomics, co-IP, functional in vitro/in vivo tumor assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq, proteomics, and co-IP identify complex; functional oncogenic role validated in vitro and in vivo with 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, and single-cell RNA sequencing shows Jag1 suppresses EC subsets that proliferate and migrate, establishing JAG1-NOTCH4 as a mechanosensing pathway promoting atherosclerosis.\",\n      \"method\": \"EC-specific Jag1 conditional KO mice, porcine/murine artery models, light-sheet imaging, single-cell RNA sequencing\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with clear atherosclerosis phenotype, scRNA-seq mechanistic characterization, multiple model systems\",\n      \"pmids\": [\"36044575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"JAG1 and JAG2 undergo gamma-secretase complex (GSC)-dependent and glycogen synthase kinase 3-dependent post-translational modifications that generate a JAG1 C-terminal peptide and regulate full-length JAG2 abundance on the cell surface, creating distinct assemblies that regulate Notch signal strength and determine tracheobronchial stem/progenitor cell fate.\",\n      \"method\": \"GSC inhibitors, neutralizing peptides/antibodies, RNA-Seq, biochemical surface expression assays, air-liquid-interface cultures\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — biochemical characterization of PTMs plus functional cell fate outcomes, mechanism partially elucidated\",\n      \"pmids\": [\"35819850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Jag1-mediated cis-inhibition of Notch receptors in multipotent pancreatic progenitors is essential for exiting the multipotent state, while Dll1-mediated trans-activation is required for adopting bipotent fate; a mathematical model incorporating cis- and trans-interactions recapitulates in vivo knockout phenotypes.\",\n      \"method\": \"Mathematical modeling validated against Notch pathway knockout mice, small molecule inhibitor studies, Hes1 oscillation measurements\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — model quantitatively validated against multiple genetic and pharmacological perturbations, mechanistic distinction of cis vs trans interactions\",\n      \"pmids\": [\"36681690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Soluble, multivalent JAG1 displayed on DNA origami nanopatterns activates Notch signaling in neuroepithelial stem-like cells without requiring a pulling force, challenging the prevailing model that mechanical force is obligatory for Notch receptor activation.\",\n      \"method\": \"DNA origami nanopattern display, Notch signaling reporter assays in neuroepithelial cells, chimeric ligand controls ruling out confounds\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — molecularly precise reconstitution with multiple controls ruling out confounding factors, directly tests and challenges mechanistic model\",\n      \"pmids\": [\"38238313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HOXA5 directly binds the JAG1 gene promoter and represses JAG1 transcription; loss of HOXA5 via DNA hypermethylation leads to JAG1 upregulation, consequent NOTCH pathway activation, and kidney fibrosis in mice and humans.\",\n      \"method\": \"ChIP (HOXA5 binding to JAG1 promoter), conditional Hoxa5 KO and knockin mice, DNA methyltransferase inhibitor 5-Aza, genome-wide methylation analysis\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct ChIP evidence of HOXA5-JAG1 promoter binding, validated with conditional KO and knockin in vivo\",\n      \"pmids\": [\"38521405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"KSHV vFLIP induces JAG1 expression through an NF-κB-dependent mechanism in lymphatic endothelial cells, and JAG1-stimulated signaling through NOTCH4 suppresses cell-cycle genes in adjacent cells, promoting cellular quiescence.\",\n      \"method\": \"KSHV vFLIP/vGPCR expression, NF-κB inhibition, gene expression profiling, Notch signaling assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — NF-κB pathway mechanism defined with inhibitors and gene profiling, single lab\",\n      \"pmids\": [\"19816565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In HTLV-1-transformed ATL cells, JAG1 overexpression is driven by the viral Tax protein and cellular factors miR-124a, STAT3, and NFATc1; blockade of JAG1 signaling dampens NOTCH1 downstream activity and limits ATL cell migration.\",\n      \"method\": \"shRNA knockdown, neutralizing antibodies, RT-PCR, FACS, immunohistochemistry, migration assays\",\n      \"journal\": \"Journal of hematology & oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — multiple regulatory factors identified, KD phenotype defined, single lab\",\n      \"pmids\": [\"30231940\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"JAG1 is a transmembrane Notch pathway ligand that activates Notch receptors in neighboring cells (trans-activation) and can also undergo cis-inhibition of Notch in the same cell; its activity is regulated by ubiquitylation (by Mib), post-translational glycosylation, retromer-dependent endosomal recycling, and proteolytic processing to generate a nuclear-targeted intracellular domain (JICD1) that acts as a transcriptional cofactor with DDX17/SMAD3/TGIF2; JAG1 surface expression is required for canonical Notch signaling in diverse developmental contexts (heart, liver, pancreas, lens, airway, gonad, vasculature), haploinsufficiency causes Alagille syndrome, and context-dependent JAG1-Notch outputs are determined by ligand dosage, ligand competition with DLL4, mechanosensing (JAG1-NOTCH4 in endothelium), and transcriptional regulation of JAG1 itself by factors including HOXA5, NF-κB, GATA1, and multiple microRNAs.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"JAG1 is a transmembrane ligand of the Notch signaling pathway that controls cell-fate decisions across diverse developmental and homeostatic contexts by activating Notch receptors on neighboring cells (trans-activation) and inhibiting Notch receptors within the same cell (cis-inhibition). Surface presentation of JAG1 is essential for signaling and is regulated by glycosylation-dependent ER quality control, Mind bomb (Mib)-mediated ubiquitylation, SNX17/retromer-dependent endosomal recycling, and gamma-secretase/GSK3-dependent proteolytic processing [PMID:11157803, PMID:20573700, PMID:25408867, PMID:35819850]. Beyond canonical Notch activation, proteolytic cleavage of JAG1 generates a nuclear-targeted intracellular domain (JICD1) that forms a transcriptional cofactor complex with DDX17, SMAD3, and TGIF2 to drive SOX2 expression and oncogenic transformation [PMID:36417870, PMID:31506332]. Haploinsufficiency of JAG1 causes Alagille syndrome, and the developing heart is especially sensitive to reduced JAG1 dosage [PMID:9585603, PMID:12649809].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of JAG1 as a Notch ligand mapping to the Alagille syndrome critical region established the gene as a candidate for a major developmental disorder and anchored it within the Notch signaling framework.\",\n      \"evidence\": \"CpG island cloning and full-length cDNA characterization with chromosomal mapping to 20p12\",\n      \"pmids\": [\"9268641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional signaling data at this stage\", \"Causative role in Alagille syndrome not yet proven\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstration that diverse loss-of-function mutations — including whole-gene deletions — cause Alagille syndrome established haploinsufficiency as the disease mechanism, ruling out dominant-negative effects.\",\n      \"evidence\": \"SSCP screening and FISH on 54 AGS probands identifying deletions, frameshifts, nonsense, splice-site, and missense mutations\",\n      \"pmids\": [\"9585603\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific sensitivity to dosage not yet explored\", \"Molecular basis of variable expressivity unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Functional dissection of disease-associated missense mutations revealed that defective glycosylation and ER retention prevent surface delivery of JAG1, directly linking protein trafficking to loss of Notch signaling activity.\",\n      \"evidence\": \"Cell-surface expression, glycosylation analysis, Notch reporter assays, and immunofluorescence on R184H and L37S mutants\",\n      \"pmids\": [\"11157803\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chaperone/ERAD machinery handling misfolded JAG1 not identified\", \"In vivo trafficking dynamics unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Characterization of the leaky G274D allele showed that partial surface delivery produces an intermediate signaling output, and the cardiac-specific phenotype demonstrated the heart's heightened sensitivity to JAG1 dosage — establishing a tissue-specific threshold model.\",\n      \"evidence\": \"Glycosylation and surface expression assays combined with genotype–phenotype analysis in a 13-member family\",\n      \"pmids\": [\"12649809\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of tissue-specific dosage sensitivity unknown\", \"Whether other organs have distinct thresholds untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of Mib-dependent ubiquitylation of Jag1 as a prerequisite for trans-activation of Notch resolved how the ligand's endocytic trafficking enables receptor activation in signal-receiving cells.\",\n      \"evidence\": \"Ubiquitylation assays and genetic epistasis in zebrafish notochord and muscle patterning\",\n      \"pmids\": [\"20573700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ubiquitin chain type and lysine sites on JAG1 not mapped\", \"Whether other E3 ligases contribute to JAG1 regulation unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that SNX17 binds Jag1 and promotes retromer-dependent recycling to the plasma membrane revealed a post-endocytic mechanism controlling the pool of signaling-competent JAG1 at the cell surface.\",\n      \"evidence\": \"Biochemical binding assays and vesicular trafficking assays in zebrafish neurogenesis and pancreas models\",\n      \"pmids\": [\"25408867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mammalian validation of SNX17-JAG1 recycling pathway not reported\", \"Whether recycling modulates cis- vs. trans-signaling untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Conditional Jag1 deletion in surface ectoderm demonstrated an essential role for JAG1-Notch signaling in lens vesicle separation, extending JAG1's known developmental functions to eye morphogenesis.\",\n      \"evidence\": \"AP2α-Cre conditional knockout mouse with histological analysis\",\n      \"pmids\": [\"22275127\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream targets mediating lens separation not identified\", \"Which Notch receptor is the relevant partner in this context unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"ChIP-qPCR showing HES1/HEY1 binding to the Gdnf promoter downstream of JAG1-Notch signaling in Sertoli cells established a direct transcriptional mechanism by which spermatogonial stem cells create negative feedback on their own niche.\",\n      \"evidence\": \"Double-mutant mouse model, ChIP-qPCR, dual luciferase assay, and co-culture\",\n      \"pmids\": [\"28051360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional JAG1-dependent targets regulate the niche untested\", \"Quantitative relationship between JAG1 levels and GDNF output not determined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genetic epistasis in coronary vasculature revealed that JAG1 and DLL4 act as antagonistic Notch ligands controlling arterial vs. capillary fate, with EphrinB2 identified as a critical downstream effector — establishing a ligand-competition model for vascular patterning.\",\n      \"evidence\": \"Multiple conditional endocardial KO mice, ventricular explant rescue, and primary human EC assays\",\n      \"pmids\": [\"31789590\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How differential receptor glycosylation (Fringe) tunes Jag1 vs. Dll4 preference in coronary ECs not fully defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovery that KRAS-driven ADAM17 cleavage of JAG1 generates a nuclear-targeted intracellular domain (Jag1-ICD) that promotes EMT and chemoresistance independently of canonical Notch activation revealed a ligand-intrinsic signaling mode.\",\n      \"evidence\": \"In vitro and in vivo CRC models with KRAS/ADAM17 inhibition and Jag1-ICD nuclear translocation assays\",\n      \"pmids\": [\"31506332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets of Jag1-ICD in CRC not genome-wide mapped\", \"Structural basis of nuclear import undefined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"ChIP-seq and proteomics defined the JICD1–DDX17–SMAD3–TGIF2 complex as a transcriptional unit driving SOX2 expression and oncogenic transformation, providing the first genome-wide map of JICD1 chromatin occupancy.\",\n      \"evidence\": \"ChIP-seq, transcriptomics, proteomics, co-IP, and in vitro/in vivo tumor assays in astrocytes\",\n      \"pmids\": [\"36417870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether JICD1 complex composition varies across cell types unknown\", \"Structural basis of DDX17–JICD1 interaction unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstration that JAG1-NOTCH4 signaling is activated by disturbed blood flow and promotes atherosclerosis established JAG1 as a mechanosensing effector in endothelial cells.\",\n      \"evidence\": \"EC-specific Jag1 conditional KO mice, porcine/murine artery models, light-sheet imaging, and single-cell RNA-seq\",\n      \"pmids\": [\"36044575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanosensor upstream of JAG1 induction by disturbed flow not identified\", \"Whether NOTCH4 is the sole receptor in this context not genetically tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mathematical modeling validated against multiple knockout phenotypes formally distinguished JAG1-mediated cis-inhibition from DLL1-mediated trans-activation in pancreatic progenitors, showing that cis-inhibition drives exit from multipotency.\",\n      \"evidence\": \"Quantitative model benchmarked against Notch pathway conditional KO mice, inhibitor studies, and Hes1 oscillation measurements\",\n      \"pmids\": [\"36681690\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical parameters of cis vs. trans binding affinities in pancreatic cells not directly measured\", \"Whether cis-inhibition operates similarly in non-pancreatic tissues not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Reconstitution of Notch activation by soluble multivalent JAG1 on DNA origami without pulling force challenged the obligate mechanical-force model, suggesting that ligand clustering alone can suffice for receptor activation.\",\n      \"evidence\": \"DNA origami nanopattern display with Notch reporter assays in neuroepithelial stem-like cells and chimeric ligand controls\",\n      \"pmids\": [\"38238313\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether force-independent activation occurs in vivo or is an in vitro phenomenon\", \"Threshold valency and spacing requirements not fully defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"HOXA5 was shown to directly repress JAG1 transcription, and epigenetic silencing of HOXA5 derepresses JAG1 to promote kidney fibrosis, revealing an upstream transcriptional checkpoint on JAG1 expression.\",\n      \"evidence\": \"ChIP of HOXA5 at the JAG1 promoter, conditional Hoxa5 KO/knockin mice, and 5-Aza treatment with genome-wide methylation analysis\",\n      \"pmids\": [\"38521405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HOXA5 regulates JAG1 in non-renal tissues unknown\", \"Other transcription factors cooperating at the JAG1 promoter not mapped genome-wide\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of cis- vs. trans-engagement of Notch receptors by JAG1, the full spectrum of JICD1 nuclear targets and complex partners across cell types, the identity of the mechanosensor upstream of flow-induced JAG1, and whether force-independent Notch activation by multivalent JAG1 occurs in physiological settings.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal structure of JAG1–Notch cis-complex\", \"JICD1 target genes mapped only in astrocytes and CRC\", \"In vivo relevance of force-independent activation untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 4, 6, 8, 13, 16]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [21, 17]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [14, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 3, 9, 20]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [14, 18]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 6, 8, 13, 15, 16, 19, 22]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7, 15, 17, 21]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 5, 14, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [18, 23]}\n    ],\n    \"complexes\": [\n      \"JICD1-DDX17-SMAD3-TGIF2\"\n    ],\n    \"partners\": [\n      \"NOTCH1\",\n      \"NOTCH2\",\n      \"NOTCH4\",\n      \"MIB1\",\n      \"SNX17\",\n      \"DDX17\",\n      \"SMAD3\",\n      \"TGIF2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}