{"gene":"JUN","run_date":"2026-06-10T01:55:23","timeline":{"discoveries":[{"year":1988,"finding":"c-Jun dimerizes as a homodimer to bind the AP-1 DNA site in vitro, while c-Jun/c-Fos heterodimers bind the AP-1 element ~25-fold more efficiently than c-Jun homodimers, establishing the basis for differential DNA-binding affinity of AP-1 complexes.","method":"In vitro translation, gel retardation/EMSA, co-translation dimerization assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro reconstitution with multiple orthogonal binding assays; foundational and widely replicated","pmids":["3142692"],"is_preprint":false},{"year":1990,"finding":"c-Jun and the glucocorticoid receptor (GR) reciprocally repress each other's transcriptional activation through a mechanism independent of DNA binding, requiring the leucine zipper of c-Jun and the ligand-binding/DNA-binding domains of GR; bacterially expressed c-Jun disrupts GR-GRE complexes in gel retardation assays.","method":"Transient transfection reporter assay, mutant analysis, gel retardation with bacterially expressed proteins","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstitution with purified protein, mutant analysis, and reporter assays in one study; widely cited and replicated","pmids":["2169353"],"is_preprint":false},{"year":1991,"finding":"Two serine residues in the c-Jun N-terminal transactivation domain (within the A1 domain) are phosphorylated in response to mitogens, phorbol esters, and activated Ras by MAP kinases (pp54 and pp42/44), and this phosphorylation positively regulates c-Jun transactivation activity.","method":"In vitro kinase assay, phosphorylation site mapping, reporter transcription assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro kinase assay with site identification; independently replicated across labs","pmids":["1922387"],"is_preprint":false},{"year":1991,"finding":"c-Jun and MyoD physically interact in vivo and in vitro via the leucine zipper domain of c-Jun and the helix-loop-helix region of MyoD, resulting in mutual transcriptional repression; c-Jun inhibits MyoD-dependent myogenesis.","method":"Co-immunoprecipitation (in vivo), in vitro binding assay, transient transfection reporter assay, mutational analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reciprocal co-IP plus in vitro binding, mutational dissection, and functional reporter assay in one study","pmids":["1310896"],"is_preprint":false},{"year":1993,"finding":"c-Jun is essential for normal mouse hepatogenesis and fetal development; c-jun-null embryos die at mid-to-late gestation with impaired hepatogenesis and altered fetal liver erythropoiesis, establishing a required in vivo role for c-Jun in liver development.","method":"Targeted gene knockout in mice (homologous recombination), chimeric mouse analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — definitive loss-of-function genetic model with specific developmental phenotype; replicated in subsequent studies","pmids":["8371760"],"is_preprint":false},{"year":1994,"finding":"A subfamily of MAP kinases designated stress-activated protein kinases (SAPKs/p54s, later called JNKs) are identified as the principal c-Jun N-terminal kinases; they are activated by cellular stress and TNF-α (but not mitogens) and are more active than Erk1/2 in phosphorylating the c-Jun transactivation domain, defining a new stress/TNF-α signaling pathway regulating c-Jun.","method":"Molecular cloning, in vitro kinase assay with substrate specificity profiling, cell stimulation assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with substrate specificity, molecular cloning, multiple activation conditions; foundational paper replicated extensively","pmids":["8177321"],"is_preprint":false},{"year":1995,"finding":"The DNA-binding activity of c-Jun is regulated by the phosphorylation state of a cluster of Thr/Ser residues near its C-terminus; C-terminal dephosphorylation (activating DNA binding) is an indirect consequence of a separate N-terminal phosphorylation event, indicating intramolecular signal transduction within c-Jun.","method":"Phosphorylation site mutagenesis, DNA-binding assay, phorbol ester stimulation","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutational analysis and DNA-binding assays in a single study; mechanistically informative but single lab","pmids":["7744008"],"is_preprint":false},{"year":1996,"finding":"c-Jun is required for Ras-induced cellular transformation; c-jun null fibroblasts lack anchorage independence, loss of contact inhibition, and tumorigenicity in response to activated Ras, and these defects are rescued by re-expression of c-Jun, establishing c-Jun as an essential effector of Ras transformation.","method":"Genetic epistasis using c-jun null fibroblasts, ras transformation assay, soft agar/focus assay, nude mouse tumorigenicity","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — definitive loss-of-function with rescue, multiple transformation readouts; strong epistasis evidence","pmids":["8754851"],"is_preprint":false},{"year":1996,"finding":"c-Jun interacts with the DNA-binding domain/hinge region of the androgen receptor (AR), supporting AR-mediated transactivation in the absence of c-Jun DNA binding or c-Fos interaction; this interaction was demonstrated using a modified yeast two-hybrid system in COS cells.","method":"Transient transfection reporter assay, modified yeast two-hybrid in mammalian cells (Cos cells)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — protein interaction demonstrated by modified two-hybrid, functional reporter assay; single lab, limited orthogonal methods","pmids":["8798722"],"is_preprint":false},{"year":1996,"finding":"c-Jun is degraded via multi-ubiquitination, whereas the related family member JunD is not efficiently ubiquitinated and has a longer half-life; the N-terminal delta-domain of c-Jun contains the determinant for differential ubiquitination between c-Jun and JunD.","method":"In vivo ubiquitination assay, mutational analysis, pulse-chase protein stability assay","journal":"Biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay with mutational dissection; single lab","pmids":["8922589"],"is_preprint":false},{"year":1998,"finding":"JNK binds to c-Jun in vivo through multiple interaction regions: the c-Jun delta-region docking site is essential, and the C-terminal DNA-binding domain harbors an auxiliary interaction domain capable of independently binding JNK; JNK binding does not require its catalytic activity nor the phosphoacceptor sites in c-Jun, and activated JNK can phosphorylate c-Jun without necessarily dissociating from it.","method":"In vivo co-immunoprecipitation, in vitro binding with purified recombinant proteins, mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reciprocal in vivo co-IP plus in vitro reconstitution with purified proteins and systematic mutagenesis","pmids":["9837920"],"is_preprint":false},{"year":1998,"finding":"The retinoblastoma protein (Rb) binds c-Jun via the leucine zipper region of c-Jun and the B pocket plus C-terminal domain of Rb, and stimulates c-Jun transcriptional activity from an AP-1 consensus sequence; this complex forms in terminally differentiating keratinocytes and in early G1; HPV16 E7 (which binds both) inhibits Rb activation of c-Jun.","method":"Co-immunoprecipitation, transient transfection reporter assay, mutagenesis, cell-cycle synchronized cells","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus reporter assay plus mutagenesis; single lab","pmids":["9545246"],"is_preprint":false},{"year":1998,"finding":"In PC12 cells, ERK pathway activation leads to both increased c-Jun expression and phosphorylation (on Ser63/73); constitutively active c-Jun induces neuronal differentiation independently of upstream signals, while dominant-negative c-JunbZIP prevents MEK1-induced neurite outgrowth, establishing c-Jun as a downstream effector of ERK for neuronal differentiation.","method":"Constitutively active/dominant-negative expression, MEK1 activation, PC12 cell differentiation assay","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with specific morphological readout; single lab","pmids":["9687508"],"is_preprint":false},{"year":1999,"finding":"c-Jun promotes G1-to-S phase progression by directly controlling transcription of cyclin D1; this function is independent of Ser63/73 phosphorylation. Additionally, c-Jun protects cells from UV-induced apoptosis and cooperates with NF-κB against TNFα-induced apoptosis; anti-apoptotic function against UV requires Ser63/73 phosphorylation.","method":"c-Jun null fibroblasts, cyclin D1 reporter assay, serine-to-alanine phosphorylation mutants, apoptosis assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (null cells, mutagenesis, reporter, cell death assays); two distinct mechanisms dissected in one study","pmids":["9878062"],"is_preprint":false},{"year":1999,"finding":"c-Jun negatively regulates p53 transcription by directly binding to a variant AP-1 site in the p53 promoter; loss of c-Jun leads to elevated p53 and p21 expression and impaired G1-CDK/E2F activation; deletion of p53 rescues all proliferation defects of c-jun-null cells, establishing p53 repression as the rate-limiting function of c-Jun in fibroblast proliferation.","method":"c-Jun null fibroblasts, p53 promoter-reporter assay, ChIP/AP-1 site mutagenesis, p53 knockout epistasis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct promoter binding assay, mutagenesis, genetic epistasis (double knockout), multiple orthogonal approaches","pmids":["10072388"],"is_preprint":false},{"year":1999,"finding":"c-Jun null embryos show impaired hepatogenesis and extensive apoptosis in fetal liver; c-jun-/- fetal liver cells can reconstitute hematopoietic compartments in lethally irradiated recipients (no cell-autonomous hematopoietic defect); heart outflow tract malformations (truncus arteriosus-like) are also observed, identifying novel roles for c-Jun in hepatocyte survival and cardiac development.","method":"Targeted gene knockout, chimeric mouse reconstitution, apoptosis assays, developmental morphology","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with transplantation rescue experiment; multiple developmental phenotypes characterized","pmids":["10352021"],"is_preprint":false},{"year":2000,"finding":"SUMO-1 covalently modifies c-Jun predominantly at Lys-229; this modification negatively regulates c-Jun transcriptional activity (SUMO-1-deficient K229R mutant shows increased AP-1 transactivation). JNK activation reduces SUMO-1 modification of c-Jun; loss of the JNK phosphorylation sites Ser63/Ser73 greatly enhances SUMO-1 conjugation, linking JNK phosphorylation to decreased SUMO-1 modification.","method":"In vitro and in vivo SUMOylation assay, site-directed mutagenesis (K229R, S63A/S73A), AP-1 reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro and in vivo SUMOylation with mutagenesis and functional reporter assay; rigorous mechanistic dissection","pmids":["10788439"],"is_preprint":false},{"year":2000,"finding":"c-Jun promotes cellular survival by negatively regulating PTEN expression: c-Jun binds a variant AP-1 site in the PTEN promoter to suppress PTEN transcription, leading to Akt pathway activation; c-jun-/- fibroblasts show elevated PTEN and are sensitive to nutrient deprivation; siRNA knockdown of PTEN rescues death from c-Jun deficiency.","method":"Inducible c-Jun expression, AP-1 reporter on PTEN promoter, ChIP, siRNA knockdown epistasis, c-jun null cells","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP, promoter reporter, siRNA epistasis, null cell rescue; multiple methods in one study","pmids":["16676006"],"is_preprint":false},{"year":2001,"finding":"Stable expression of a non-phosphorylatable dominant negative c-Jun(S63A,S73A) inhibits AP-1-driven transcription and increases sensitivity to DNA-damaging agents (associated with enhanced apoptosis) but does not affect sensitivity to non-DNA-damaging cytotoxic agents, demonstrating a selective protective role for phospho-c-Jun in DNA damage responses.","method":"Stable expression of dominant-negative phosphorylation mutant, AP-1 reporter assay, cytotoxicity assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation-site mutant with functional readout; single lab, single method per condition","pmids":["11352915"],"is_preprint":false},{"year":2002,"finding":"c-Jun directly interacts with the oncoprotein Ski and enhances Ski association with Smad2 under basal conditions, maintaining repression of Smad2-responsive genes; TGF-β signaling induces dissociation of the c-Jun/Ski complex, relieving active repression; JNK pathway activation suppresses TGF-β-induced dissociation of c-Jun from Ski.","method":"Co-immunoprecipitation, reporter assay, TGF-β stimulation, JNK pathway manipulation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP showing ternary complex plus reporter assay; single lab","pmids":["12034730"],"is_preprint":false},{"year":2002,"finding":"Menin inhibits JNK-mediated phosphorylation of c-Jun (and ERK-mediated phosphorylation of JunD/Elk-1) without affecting JNK1 or ERK2 activation itself, indicating that Menin acts downstream of MAPKs to uncouple kinase activation from nuclear substrate phosphorylation; distinct N-terminal Menin domains mediate inhibition of ERK vs. JNK pathways.","method":"In vitro kinase assay, overexpression of Menin, deletion mutagenesis of Menin","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay plus domain mapping; single lab","pmids":["12226747"],"is_preprint":false},{"year":2003,"finding":"c-Jun is required for epidermal leading edge organization and wound healing; conditional deletion of c-Jun in keratinocytes prevents EGFR activation at wound edges; c-Jun controls an EGFR autocrine loop by transcriptionally regulating HB-EGF, and conditioned medium or HB-EGF rescues migration defects.","method":"Conditional knockout (epidermis-specific), scratch migration assay, EGFR activation assay, conditioned medium rescue","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with mechanistic rescue; two companion papers (PMIDs 12791271 and 12791272) both establish same pathway","pmids":["12791271","12791272"],"is_preprint":false},{"year":2003,"finding":"ATF2 and c-Jun physically associate; dimerization of c-Jun with ATF2 in the nucleus prevents nuclear export of ATF2 (which contains a leucine-zipper nuclear export signal), promoting transcriptional activation of the c-jun promoter; c-Jun-dependent nuclear retention of ATF2 occurs during RA-induced differentiation and UV-induced cell death.","method":"Subcellular fractionation, live-cell imaging, FRAP-like localization assays, co-immunoprecipitation, promoter reporter assay, NES/NLS mutagenesis","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional consequence, Co-IP, reporter assay; single lab","pmids":["16511568"],"is_preprint":false},{"year":2003,"finding":"ATF3 physically associates with c-Jun and significantly enhances c-Jun-mediated neurite sprouting in neuronal-like cell lines; co-expression of both factors beyond the additive effect of either alone suggests cooperation through direct protein–protein interaction.","method":"Co-expression/transfection, neurite sprouting assay, co-immunoprecipitation (physical association inferred)","journal":"Brain research. Molecular brain research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, indirect evidence of interaction (abstract states 'most likely mediated by a physical association'); neurite assay functional readout","pmids":["14667575"],"is_preprint":false},{"year":2004,"finding":"c-Jun contributes to p73 induction by cisplatin: c-Jun transcriptionally activates p73 and increases p73 protein stability by preventing proteasome-mediated degradation, potentiating p73 transcriptional activity and apoptosis; c-jun-/- cells are resistant to cisplatin-induced apoptosis and show defective p73 induction; re-expression of c-Jun restores sensitivity.","method":"c-Jun null cells, ectopic c-Jun expression, p73 half-life/pulse-chase, proteasome inhibitor assay, apoptosis assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — null cells plus rescue, protein stability assay; single lab","pmids":["15302867"],"is_preprint":false},{"year":2007,"finding":"Methylation-controlled J protein (MCJ), a Golgi-localized cochaperone, is required for c-Jun degradation; loss of MCJ leads to elevated c-Jun protein levels and c-Jun-mediated transcriptional induction of the ABCB1 drug transporter, conferring drug resistance.","method":"siRNA knockdown of MCJ, c-Jun protein stability assay, AP-1 reporter, ABCB1 expression analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — knockdown with mechanistic follow-up; single lab, limited direct interaction evidence shown in abstract","pmids":["17283040"],"is_preprint":false},{"year":2008,"finding":"c-Jun negatively regulates the myelinating Schwann cell phenotype: at physiological levels c-Jun inhibits myelin gene activation by Krox-20/EGF, drives myelinating cells back to an immature state after nerve injury, and shows cross-antagonism with Krox-20; enforced c-Jun expression inhibits myelination in co-cultures.","method":"Conditional transgenic overexpression, co-culture myelination assay, nerve transection in vivo, reporter assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo and in vitro gain-of-function with defined myelination readouts; replicated in subsequent studies","pmids":["18490512"],"is_preprint":false},{"year":2008,"finding":"c-Jun depletion inhibits 28S and 18S rRNA accumulation and causes partial translocation of RNA helicase DDX21 from the nucleolus to the nucleoplasm; c-Jun directly interacts with DDX21, and exogenous c-Jun rescues DDX21 nucleolar localization and rRNA binding, revealing a non-transcriptional, nucleolar role for c-Jun in rRNA processing.","method":"siRNA knockdown, rRNA processing assay, co-immunoprecipitation (c-Jun–DDX21 interaction), subcellular fractionation/immunofluorescence, rescue by exogenous c-Jun","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockdown + rescue + Co-IP + localization with functional rRNA processing readout; multiple orthogonal methods","pmids":["18180292"],"is_preprint":false},{"year":2010,"finding":"Mkp1 (a MAPK phosphatase) is a direct c-Jun target gene in sympathetic neurons: c-Jun and ATF2 bind two conserved ATF sites in the Mkp1 promoter (demonstrated by ChIP and in vitro binding); Mkp1 overexpression inhibits JNK-mediated c-Jun phosphorylation and protects neurons from apoptosis; Mkp1 knockdown accelerates death, establishing a negative feedback loop.","method":"ChIP, in vitro promoter binding, microinjection/overexpression, Mkp1 knockout mice, sympathetic neuron apoptosis assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP, in vitro binding, genetic knockout, and gain/loss-of-function all in one study","pmids":["20702711"],"is_preprint":false},{"year":2012,"finding":"c-Jun in Schwann cells directly regulates GDNF and Artemin (ligands for the Ret receptor) as novel target genes; after nerve injury, Schwann cell-specific c-Jun deletion impairs axonal regeneration and causes motoneuron death; administration of recombinant GDNF and Artemin substantially rescues regeneration defects, and neuron-specific Ret deletion recapitulates regeneration (but not survival) defects.","method":"Schwann cell-conditional c-Jun knockout, neurotrophic factor ChIP/target gene analysis, recombinant protein rescue, neuron-specific Ret knockout epistasis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO plus rescue with recombinant proteins plus genetic epistasis with Ret KO; multiple orthogonal approaches","pmids":["22753894"],"is_preprint":false},{"year":2012,"finding":"c-Jun activation in Schwann cells is a global regulator of Wallerian degeneration: c-Jun governs trophic factor expression, adhesion molecule expression, regeneration track formation, myelin clearance, and activates a repair/dedifferentiation program; c-Jun-deficient Schwann cells form a dysfunctional repair cell leading to failure of functional recovery and neuronal death.","method":"Schwann cell-conditional c-Jun knockout, nerve crush/transection injury models, functional recovery assays, gene expression analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional loss-of-function with comprehensive phenotypic analysis in multiple injury paradigms","pmids":["22920255"],"is_preprint":false},{"year":2013,"finding":"c-Jun is required for joint specification during skeletal development: c-Jun is specifically expressed in joint interzones, conditionally deleting c-Jun from limb bud mesenchyme severely impairs initiation and differentiation of all limb joints, and c-Jun directly regulates Wnt9a and Wnt16 expression in the joint interzone.","method":"Conditional knockout (limb-specific), transgenic reporter (enhancer-driven), in silico promoter screen, chromatin/functional analysis of Wnt target genes","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with specific developmental phenotype plus direct target gene regulation established","pmids":["23475960"],"is_preprint":false},{"year":2015,"finding":"c-Jun acts as a barrier to iPSC reprogramming: c-Jun activates mesenchymal-related genes and broadly suppresses pluripotency genes, blocking the obligatory mesenchymal-to-epithelial transition during reprogramming; shRNA inhibition, dominant-negative c-Jun, or Jdp2 expression enhances reprogramming and can replace Oct4 among Yamanaka factors.","method":"shRNA knockdown, dominant-negative expression, iPSC reprogramming assay, gene expression profiling","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with mechanistic gene expression analysis; single lab","pmids":["26098572"],"is_preprint":false},{"year":2016,"finding":"O-GlcNAcylation of c-Jun at Ser73 stabilizes c-Jun protein, promotes its nuclear accumulation and transcriptional activity, and enables c-Jun to directly bind the PSAT1 and CBS promoters to upregulate GSH synthesis, thereby antagonizing ferroptosis; O-GlcNAc-deficient c-Jun(S73A) mutant fails to rescue GSH synthesis or inhibit ferroptosis.","method":"OGT inhibitor/activator treatment, c-Jun-WT vs S73A mutant overexpression, ChIP on PSAT1/CBS promoters, GSH measurement, ferroptosis assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis, ChIP, and metabolite measurement; single lab","pmids":["31394193"],"is_preprint":false},{"year":2016,"finding":"USP6 deubiquitinase interacts with c-Jun, antagonizes its ubiquitination (dependent on USP6 enzyme activity), and thereby stabilizes c-Jun protein and upregulates AP-1 signaling; USP6 overexpression promotes cell invasion.","method":"DUB library screen, co-immunoprecipitation, ubiquitination assay, AP-1 reporter, invasion assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus ubiquitination assay plus functional readout; identified via screening but mechanistically validated","pmids":["29061731"],"is_preprint":false},{"year":2016,"finding":"PRR7, a synaptic component, accumulates in hippocampal neuron nuclei following NMDAR activity and inhibits ubiquitination of c-Jun by E3 ligase SCF(FBW7), increasing c-Jun-dependent transcriptional activity and promoting neuronal death; PRR7 knockdown attenuates NMDAR-mediated excitotoxicity in a c-Jun-dependent manner.","method":"Synaptonuclear trafficking assay, co-immunoprecipitation (PRR7–FBW7–c-Jun), ubiquitination assay, c-Jun reporter, siRNA knockdown, excitotoxicity assay","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, and functional epistasis; single lab","pmids":["27458189"],"is_preprint":false},{"year":2019,"finding":"KDM4B histone demethylase physically interacts with c-Jun on the promoters of IL-8, MMP1, and ITGAV via its demethylation activity, acting as a coactivator of c-Jun; depletion of KDM4B decreases integrin αV expression and cell migration.","method":"Co-immunoprecipitation, ChIP on target promoters, KDM4B knockdown, migration assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP and ChIP demonstrating physical interaction on chromatin; single lab","pmids":["30683841"],"is_preprint":false},{"year":2022,"finding":"Lactate interacts with c-Jun protein to protect it from FBW7 ubiquitin-ligase-mediated degradation in myeloid cells; this was identified by LC-MS followed by CRISPR-Cas9-mediated gene disruption, positioning lactate as an intracellular sensor ligand for c-Jun stability and c-Jun as a sensor of intracellular lactate in MDSC differentiation.","method":"LC-MS metabolite–protein interaction screen, CRISPR-Cas9 gene disruption, co-immunoprecipitation, ubiquitination assay","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — LC-MS interaction screen plus CRISPR functional validation and ubiquitination assay; single lab","pmids":["35263597"],"is_preprint":false}],"current_model":"c-Jun is a bZIP transcription factor that functions as a homodimer or heterodimer (most potently with c-Fos) binding AP-1 DNA elements; its activity is positively regulated by JNK/SAPK-mediated phosphorylation of N-terminal Ser63/Ser73 (stimulated by stress, TNF-α, and growth factors) and negatively regulated by C-terminal phosphorylation (blocking DNA binding), SUMO-1 conjugation at Lys229, and ubiquitin-proteasome degradation (opposed by deubiquitinase USP6 and inhibited by PRR7/FBW7 axis); it directly represses p53 and PTEN transcription to promote cell cycle progression and survival, transcriptionally activates GDNF/Artemin and Wnt9a/Wnt16 for nerve regeneration and joint development, controls Schwann cell dedifferentiation/repair after injury, and engages in protein–protein interactions with GR, AR, MyoD, Rb, ATF2, DDX21, Ski, and KDM4B to modulate transcriptional programs across multiple cell types."},"narrative":{"mechanistic_narrative":"c-Jun is a bZIP transcription factor that binds AP-1 DNA elements as a homodimer or, with ~25-fold higher affinity, as a heterodimer with c-Fos, providing the combinatorial basis for AP-1 target selection [PMID:3142692]. Its transactivation is switched on by N-terminal phosphorylation of two serines (Ser63/Ser73) in the transactivation domain: MAP kinases respond to mitogens, phorbol esters, and Ras [PMID:1922387], while a dedicated subfamily of stress-activated kinases (SAPK/JNK) responds to cellular stress and TNF-α and docks on c-Jun's delta-region and an auxiliary site in the DNA-binding domain [PMID:8177321, PMID:9837920]. DNA binding is reciprocally controlled by the phosphorylation state of a C-terminal Thr/Ser cluster, coupling intramolecular signal transduction to activity [PMID:7744008]. c-Jun protein levels are set by competing post-translational inputs: multi-ubiquitination targets it for degradation (a determinant residing in the N-terminal delta-domain), SUMO-1 conjugation at Lys229 dampens activity in a manner relieved by JNK phosphorylation, and stability is further tuned by the deubiquitinase USP6, the FBW7/PRR7 axis, O-GlcNAcylation at Ser73, and intracellular lactate sensing [PMID:8922589, PMID:10788439, PMID:29061731, PMID:27458189, PMID:31394193, PMID:35263597]. Through these activities c-Jun drives proliferation and survival by directly repressing the p53 and PTEN promoters and activating cyclin D1, and it is an essential effector of Ras-induced transformation [PMID:10072388, PMID:16676006, PMID:9878062, PMID:8754851]. Genetically, c-Jun is required for fetal hepatogenesis, hepatocyte survival, and cardiac outflow tract development [PMID:8371760, PMID:10352021], for keratinocyte wound healing via an HB-EGF/EGFR autocrine loop [PMID:12791271, PMID:12791272], for joint specification through direct control of Wnt9a/Wnt16 [PMID:23475960], and for Schwann cell dedifferentiation and the repair program of Wallerian degeneration, where it activates GDNF and Artemin to support axonal regeneration [PMID:18490512, PMID:22920255, PMID:22753894]. c-Jun additionally modulates transcriptional programs through direct protein interactions with nuclear receptors (GR, AR), MyoD, Rb, ATF2, Ski, and the chromatin modifier KDM4B [PMID:2169353, PMID:8798722, PMID:1310896, PMID:9545246, PMID:16511568, PMID:12034730, PMID:30683841], and has a non-transcriptional nucleolar role in rRNA processing via interaction with DDX21 [PMID:18180292].","teleology":[{"year":1988,"claim":"Established the molecular basis of AP-1 DNA recognition by defining c-Jun's homo- versus heterodimeric binding modes.","evidence":"In vitro translation with gel retardation and co-translation dimerization assays","pmids":["3142692"],"confidence":"High","gaps":["Did not address in vivo target selection","No structural detail on the dimer interface beyond the leucine zipper requirement"]},{"year":1990,"claim":"Showed c-Jun activity is integrated with nuclear receptor signaling through DNA-binding-independent mutual repression with the glucocorticoid receptor.","evidence":"Reporter assays, mutant analysis, and gel retardation with bacterially expressed proteins","pmids":["2169353"],"confidence":"High","gaps":["Did not resolve whether repression is via direct contact or competition for cofactors","Physiological contexts of crosstalk not defined"]},{"year":1991,"claim":"Identified the activating N-terminal serine phosphorylation that links mitogen/Ras signaling to c-Jun transactivation, and a parallel protein-interaction repression of MyoD-driven myogenesis.","evidence":"In vitro kinase assays with site mapping, reporter assays, and co-IP/in vitro binding with mutagenesis","pmids":["1922387","1310896"],"confidence":"High","gaps":["The principal physiological N-terminal kinase was not yet identified","Mechanism of MyoD repression downstream of binding not fully defined"]},{"year":1994,"claim":"Defined the JNK/SAPK pathway as the dedicated stress/TNF-α route to c-Jun, distinguishing it from mitogen-activated ERKs.","evidence":"Molecular cloning with in vitro kinase substrate specificity profiling and cell stimulation","pmids":["8177321"],"confidence":"High","gaps":["Upstream kinase cascade not fully mapped","Substrate scope beyond c-Jun not delineated here"]},{"year":1995,"claim":"Revealed intramolecular regulation: C-terminal dephosphorylation activates DNA binding as an indirect consequence of N-terminal phosphorylation.","evidence":"Phosphorylation-site mutagenesis with DNA-binding assays under phorbol ester stimulation","pmids":["7744008"],"confidence":"Medium","gaps":["Phosphatase responsible for C-terminal dephosphorylation not identified","Single-lab mechanistic inference"]},{"year":1996,"claim":"Placed c-Jun as an essential effector of Ras transformation and clarified its differential turnover relative to JunD.","evidence":"c-jun null fibroblast transformation assays with rescue; in vivo ubiquitination and pulse-chase with delta-domain mutants; modified two-hybrid for AR interaction","pmids":["8754851","8922589","8798722"],"confidence":"High","gaps":["E3 ligase responsible for c-Jun ubiquitination not identified at this stage","AR interaction shown by a single interaction method"]},{"year":1998,"claim":"Mapped JNK docking on c-Jun and identified Rb and the ERK pathway as positive regulators of c-Jun-dependent transcription and neuronal differentiation.","evidence":"Reciprocal co-IP and in vitro binding with purified proteins; cell-cycle synchronized co-IP/reporter; PC12 gain/loss-of-function differentiation assays","pmids":["9837920","9545246","9687508"],"confidence":"High","gaps":["Functional consequence of the auxiliary JNK-binding site uncertain","Rb activation of c-Jun studied in limited cell types"]},{"year":1999,"claim":"Defined the core proliferative/survival outputs of c-Jun: cyclin D1 activation, direct p53 promoter repression as the rate-limiting proliferation function, and anti-apoptotic protection.","evidence":"c-jun null fibroblasts, promoter-reporter assays, AP-1 site mutagenesis, S63A/S73A mutants, and p53 knockout epistasis; fetal liver knockout phenotyping with hematopoietic reconstitution","pmids":["9878062","10072388","10352021"],"confidence":"High","gaps":["Phosphorylation-independent cyclin D1 control mechanism not fully resolved","Tissue specificity of p53 repression not broadly tested"]},{"year":2000,"claim":"Identified SUMO-1 at Lys229 as a negative regulator antagonized by JNK phosphorylation, and PTEN repression as a survival mechanism activating Akt.","evidence":"In vitro/in vivo SUMOylation with K229R and S63A/S73A mutants and AP-1 reporters; PTEN promoter ChIP/reporter with siRNA epistasis in null cells","pmids":["10788439","16676006"],"confidence":"High","gaps":["SUMO E3 ligase and dynamics in vivo not defined","Crosstalk between SUMO and ubiquitin pathways on c-Jun not resolved"]},{"year":2001,"claim":"Demonstrated phospho-c-Jun confers selective protection against DNA-damaging agents.","evidence":"Stable dominant-negative S63A/S73A expression with AP-1 reporter and cytotoxicity assays","pmids":["11352915"],"confidence":"Medium","gaps":["Target genes mediating DNA-damage protection not identified","Single-lab correlative apoptosis readout"]},{"year":2002,"claim":"Extended c-Jun's regulatory network to TGF-β (via Ski/Smad2 repression) and revealed Menin as a downstream uncoupler of MAPK activation from c-Jun phosphorylation.","evidence":"Co-IP of c-Jun/Ski/Smad2 ternary complex with reporter and TGF-β/JNK manipulation; in vitro kinase assays with Menin domain mapping","pmids":["12034730","12226747"],"confidence":"Medium","gaps":["Direct versus indirect nature of Menin's inhibition unresolved","Ski complex dynamics shown in single lab"]},{"year":2003,"claim":"Established c-Jun's roles in epidermal wound healing via an HB-EGF/EGFR autocrine loop and in mutual nuclear retention with ATF2.","evidence":"Epidermis-conditional knockout with migration and EGFR assays and HB-EGF rescue; subcellular fractionation/imaging with NES/NLS mutagenesis and co-IP; ATF3 co-expression neurite assay","pmids":["12791271","12791272","16511568","14667575"],"confidence":"High","gaps":["ATF2 nuclear-retention mechanism studied in limited contexts","ATF3–c-Jun physical interaction only inferred"]},{"year":2004,"claim":"Showed c-Jun potentiates chemotherapy-induced apoptosis by transcriptionally inducing and stabilizing p73.","evidence":"c-jun null cells with rescue, p73 half-life/pulse-chase, proteasome inhibition, and apoptosis assays","pmids":["15302867"],"confidence":"Medium","gaps":["Mechanism of p73 protein stabilization by c-Jun not defined","Single-lab observation"]},{"year":2008,"claim":"Defined c-Jun as a negative regulator of Schwann cell myelination and identified a non-transcriptional nucleolar role in rRNA processing via DDX21.","evidence":"Conditional/transgenic Schwann cell overexpression with co-culture and nerve-transection assays; siRNA knockdown with rescue, co-IP, localization, and rRNA processing readout","pmids":["18490512","18180292"],"confidence":"High","gaps":["Molecular basis of c-Jun's nucleolar function beyond DDX21 binding unclear","Cross-antagonism with Krox-20 mechanism not fully resolved"]},{"year":2010,"claim":"Established a JNK–c-Jun–Mkp1 negative feedback loop controlling neuronal apoptosis.","evidence":"ChIP and in vitro promoter binding, microinjection/overexpression, Mkp1 knockout mice, and sympathetic neuron apoptosis assays","pmids":["20702711"],"confidence":"High","gaps":["Generality of the feedback loop beyond sympathetic neurons not tested"]},{"year":2012,"claim":"Defined c-Jun as the master regulator of the Schwann cell repair program in Wallerian degeneration, directly activating GDNF and Artemin to drive axonal regeneration.","evidence":"Schwann cell-conditional knockout, target gene ChIP, recombinant GDNF/Artemin rescue, Ret knockout epistasis, and injury/recovery models","pmids":["22753894","22920255"],"confidence":"High","gaps":["Full transcriptional repertoire of the repair program not enumerated","Separation of regeneration versus survival outputs incompletely defined"]},{"year":2013,"claim":"Identified c-Jun as required for limb joint specification through direct regulation of Wnt9a and Wnt16.","evidence":"Limb-conditional knockout, enhancer reporters, promoter screen, and chromatin/functional analysis of Wnt genes","pmids":["23475960"],"confidence":"High","gaps":["Upstream signals positioning c-Jun in the joint interzone not defined"]},{"year":2015,"claim":"Revealed c-Jun as a barrier to iPSC reprogramming by enforcing mesenchymal identity and suppressing pluripotency genes.","evidence":"shRNA knockdown, dominant-negative expression, reprogramming assays, and expression profiling","pmids":["26098572"],"confidence":"Medium","gaps":["Direct target genes mediating the MET block not fully defined","Single-lab functional study"]},{"year":2016,"claim":"Connected c-Jun stability and activity to metabolic and redox state via O-GlcNAcylation, USP6 deubiquitination, and the PRR7/FBW7 axis.","evidence":"OGT modulation with S73A mutant, PSAT1/CBS ChIP and ferroptosis assays; DUB screen with co-IP/ubiquitination; synaptonuclear trafficking with PRR7–FBW7–c-Jun co-IP and excitotoxicity assays","pmids":["31394193","29061731","27458189"],"confidence":"Medium","gaps":["Interplay among the multiple stability inputs not integrated","Each axis validated in a single lab/cell context"]},{"year":2019,"claim":"Identified KDM4B as a chromatin-associated coactivator of c-Jun on pro-migratory target promoters.","evidence":"Co-IP, ChIP on IL-8/MMP1/ITGAV promoters, KDM4B knockdown, and migration assays","pmids":["30683841"],"confidence":"Medium","gaps":["Whether demethylase catalytic activity is strictly required for coactivation not fully resolved","Single-lab study"]},{"year":2022,"claim":"Established lactate as an intracellular ligand that protects c-Jun from FBW7-mediated degradation, making c-Jun a metabolic sensor in myeloid differentiation.","evidence":"LC-MS metabolite–protein interaction screen, CRISPR disruption, co-IP, and ubiquitination assays","pmids":["35263597"],"confidence":"Medium","gaps":["Lactate-binding site on c-Jun not mapped","Single-lab/single-system observation"]},{"year":null,"claim":"How the multiple, sometimes opposing post-translational inputs (phosphorylation, SUMOylation, ubiquitination, O-GlcNAcylation, metabolite binding) are integrated to set c-Jun activity and stability in a given cell context remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified quantitative model of c-Jun regulatory inputs","Structural basis for metabolite (lactate) sensing unknown","Context-specific E3 ligase usage not systematically mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,13,14,17,31,29]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,14,17]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[22,16]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[27]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,5,10]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,14,17,31,29]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[13,14]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,21,31,30]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[13,15,24,28,33]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[7]}],"complexes":["AP-1"],"partners":["FOS","JNK","GR","AR","MYOD","RB1","ATF2","DDX21"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P05412","full_name":"Transcription factor Jun","aliases":["Activator protein 1","AP1","Proto-oncogene c-Jun","Transcription factor AP-1 subunit Jun","V-jun avian sarcoma virus 17 oncogene homolog","p39"],"length_aa":331,"mass_kda":35.7,"function":"Transcription factor that recognizes and binds to the AP-1 consensus motif 5'-TGA[GC]TCA-3' (PubMed:10995748, PubMed:22083952). Heterodimerizes with proteins of the FOS family to form an AP-1 transcription complex, thereby enhancing its DNA binding activity to the AP-1 consensus sequence 5'-TGA[GC]TCA-3' and enhancing its transcriptional activity (By similarity). Together with FOSB, plays a role in activation-induced cell death of T cells by binding to the AP-1 promoter site of FASLG/CD95L, and inducing its transcription in response to activation of the TCR/CD3 signaling pathway (PubMed:12618758). Promotes activity of NR5A1 when phosphorylated by HIPK3 leading to increased steroidogenic gene expression upon cAMP signaling pathway stimulation (PubMed:17210646). Involved in activated KRAS-mediated transcriptional activation of USP28 in colorectal cancer (CRC) cells (PubMed:24623306). Binds to the USP28 promoter in colorectal cancer (CRC) cells (PubMed:24623306) (Microbial infection) Upon Epstein-Barr virus (EBV) infection, binds to viral BZLF1 Z promoter and activates viral BZLF1 expression","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P05412/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/JUN","classification":"Not Classified","n_dependent_lines":247,"n_total_lines":1208,"dependency_fraction":0.20447019867549668},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000177606","cell_line_id":"CID001657","localizations":[{"compartment":"nucleoplasm","grade":3},{"compartment":"chromatin","grade":2}],"interactors":[{"gene":"ATF2","stoichiometry":10.0},{"gene":"ATF7","stoichiometry":10.0},{"gene":"ATF3","stoichiometry":4.0},{"gene":"BATF3","stoichiometry":4.0},{"gene":"CREB5","stoichiometry":4.0},{"gene":"C14ORF119","stoichiometry":0.2},{"gene":"CFAP298","stoichiometry":0.2},{"gene":"NUCB2;NUCB2","stoichiometry":0.2},{"gene":"JDP2","stoichiometry":0.2},{"gene":"FOSB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001657","total_profiled":1310},"omim":[{"mim_id":"621353","title":"GLUTAMINE INSUFFICIENCY REGULATOR OF GLUTAMINASE LONG NONCODING RNA; GIRGL","url":"https://www.omim.org/entry/621353"},{"mim_id":"621303","title":"ARKADIA/RNF111 N-TERMINAL-LIKE PKA SIGNALING REGULATOR 2N; ARK2N","url":"https://www.omim.org/entry/621303"},{"mim_id":"620770","title":"MITOREGULIN; MTLN","url":"https://www.omim.org/entry/620770"},{"mim_id":"620691","title":"BUD13 HOMOLOG; BUD13","url":"https://www.omim.org/entry/620691"},{"mim_id":"620474","title":"ADIPOGENESIS-ASSOCIATED MTH938 DOMAIN-CONTAINING PROTEIN; AAMDC","url":"https://www.omim.org/entry/620474"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/JUN"},"hgnc":{"alias_symbol":["c-Jun","AP-1"],"prev_symbol":[]},"alphafold":{"accession":"P05412","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P05412","model_url":"https://alphafold.ebi.ac.uk/files/AF-P05412-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P05412-F1-predicted_aligned_error_v6.png","plddt_mean":61.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=JUN","jax_strain_url":"https://www.jax.org/strain/search?query=JUN"},"sequence":{"accession":"P05412","fasta_url":"https://rest.uniprot.org/uniprotkb/P05412.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P05412/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P05412"}},"corpus_meta":[{"pmid":"8177321","id":"PMC_8177321","title":"The stress-activated protein kinase subfamily of c-Jun 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\"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro reconstitution with multiple orthogonal binding assays; foundational and widely replicated\",\n      \"pmids\": [\"3142692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"c-Jun and the glucocorticoid receptor (GR) reciprocally repress each other's transcriptional activation through a mechanism independent of DNA binding, requiring the leucine zipper of c-Jun and the ligand-binding/DNA-binding domains of GR; bacterially expressed c-Jun disrupts GR-GRE complexes in gel retardation assays.\",\n      \"method\": \"Transient transfection reporter assay, mutant analysis, gel retardation with bacterially expressed proteins\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstitution with purified protein, mutant analysis, and reporter assays in one study; widely cited and replicated\",\n      \"pmids\": [\"2169353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Two serine residues in the c-Jun N-terminal transactivation domain (within the A1 domain) are phosphorylated in response to mitogens, phorbol esters, and activated Ras by MAP kinases (pp54 and pp42/44), and this phosphorylation positively regulates c-Jun transactivation activity.\",\n      \"method\": \"In vitro kinase assay, phosphorylation site mapping, reporter transcription assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro kinase assay with site identification; independently replicated across labs\",\n      \"pmids\": [\"1922387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"c-Jun and MyoD physically interact in vivo and in vitro via the leucine zipper domain of c-Jun and the helix-loop-helix region of MyoD, resulting in mutual transcriptional repression; c-Jun inhibits MyoD-dependent myogenesis.\",\n      \"method\": \"Co-immunoprecipitation (in vivo), in vitro binding assay, transient transfection reporter assay, mutational analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reciprocal co-IP plus in vitro binding, mutational dissection, and functional reporter assay in one study\",\n      \"pmids\": [\"1310896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"c-Jun is essential for normal mouse hepatogenesis and fetal development; c-jun-null embryos die at mid-to-late gestation with impaired hepatogenesis and altered fetal liver erythropoiesis, establishing a required in vivo role for c-Jun in liver development.\",\n      \"method\": \"Targeted gene knockout in mice (homologous recombination), chimeric mouse analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — definitive loss-of-function genetic model with specific developmental phenotype; replicated in subsequent studies\",\n      \"pmids\": [\"8371760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"A subfamily of MAP kinases designated stress-activated protein kinases (SAPKs/p54s, later called JNKs) are identified as the principal c-Jun N-terminal kinases; they are activated by cellular stress and TNF-α (but not mitogens) and are more active than Erk1/2 in phosphorylating the c-Jun transactivation domain, defining a new stress/TNF-α signaling pathway regulating c-Jun.\",\n      \"method\": \"Molecular cloning, in vitro kinase assay with substrate specificity profiling, cell stimulation assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with substrate specificity, molecular cloning, multiple activation conditions; foundational paper replicated extensively\",\n      \"pmids\": [\"8177321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The DNA-binding activity of c-Jun is regulated by the phosphorylation state of a cluster of Thr/Ser residues near its C-terminus; C-terminal dephosphorylation (activating DNA binding) is an indirect consequence of a separate N-terminal phosphorylation event, indicating intramolecular signal transduction within c-Jun.\",\n      \"method\": \"Phosphorylation site mutagenesis, DNA-binding assay, phorbol ester stimulation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutational analysis and DNA-binding assays in a single study; mechanistically informative but single lab\",\n      \"pmids\": [\"7744008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"c-Jun is required for Ras-induced cellular transformation; c-jun null fibroblasts lack anchorage independence, loss of contact inhibition, and tumorigenicity in response to activated Ras, and these defects are rescued by re-expression of c-Jun, establishing c-Jun as an essential effector of Ras transformation.\",\n      \"method\": \"Genetic epistasis using c-jun null fibroblasts, ras transformation assay, soft agar/focus assay, nude mouse tumorigenicity\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — definitive loss-of-function with rescue, multiple transformation readouts; strong epistasis evidence\",\n      \"pmids\": [\"8754851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"c-Jun interacts with the DNA-binding domain/hinge region of the androgen receptor (AR), supporting AR-mediated transactivation in the absence of c-Jun DNA binding or c-Fos interaction; this interaction was demonstrated using a modified yeast two-hybrid system in COS cells.\",\n      \"method\": \"Transient transfection reporter assay, modified yeast two-hybrid in mammalian cells (Cos cells)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — protein interaction demonstrated by modified two-hybrid, functional reporter assay; single lab, limited orthogonal methods\",\n      \"pmids\": [\"8798722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"c-Jun is degraded via multi-ubiquitination, whereas the related family member JunD is not efficiently ubiquitinated and has a longer half-life; the N-terminal delta-domain of c-Jun contains the determinant for differential ubiquitination between c-Jun and JunD.\",\n      \"method\": \"In vivo ubiquitination assay, mutational analysis, pulse-chase protein stability assay\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay with mutational dissection; single lab\",\n      \"pmids\": [\"8922589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"JNK binds to c-Jun in vivo through multiple interaction regions: the c-Jun delta-region docking site is essential, and the C-terminal DNA-binding domain harbors an auxiliary interaction domain capable of independently binding JNK; JNK binding does not require its catalytic activity nor the phosphoacceptor sites in c-Jun, and activated JNK can phosphorylate c-Jun without necessarily dissociating from it.\",\n      \"method\": \"In vivo co-immunoprecipitation, in vitro binding with purified recombinant proteins, mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reciprocal in vivo co-IP plus in vitro reconstitution with purified proteins and systematic mutagenesis\",\n      \"pmids\": [\"9837920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The retinoblastoma protein (Rb) binds c-Jun via the leucine zipper region of c-Jun and the B pocket plus C-terminal domain of Rb, and stimulates c-Jun transcriptional activity from an AP-1 consensus sequence; this complex forms in terminally differentiating keratinocytes and in early G1; HPV16 E7 (which binds both) inhibits Rb activation of c-Jun.\",\n      \"method\": \"Co-immunoprecipitation, transient transfection reporter assay, mutagenesis, cell-cycle synchronized cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus reporter assay plus mutagenesis; single lab\",\n      \"pmids\": [\"9545246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In PC12 cells, ERK pathway activation leads to both increased c-Jun expression and phosphorylation (on Ser63/73); constitutively active c-Jun induces neuronal differentiation independently of upstream signals, while dominant-negative c-JunbZIP prevents MEK1-induced neurite outgrowth, establishing c-Jun as a downstream effector of ERK for neuronal differentiation.\",\n      \"method\": \"Constitutively active/dominant-negative expression, MEK1 activation, PC12 cell differentiation assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with specific morphological readout; single lab\",\n      \"pmids\": [\"9687508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"c-Jun promotes G1-to-S phase progression by directly controlling transcription of cyclin D1; this function is independent of Ser63/73 phosphorylation. Additionally, c-Jun protects cells from UV-induced apoptosis and cooperates with NF-κB against TNFα-induced apoptosis; anti-apoptotic function against UV requires Ser63/73 phosphorylation.\",\n      \"method\": \"c-Jun null fibroblasts, cyclin D1 reporter assay, serine-to-alanine phosphorylation mutants, apoptosis assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (null cells, mutagenesis, reporter, cell death assays); two distinct mechanisms dissected in one study\",\n      \"pmids\": [\"9878062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"c-Jun negatively regulates p53 transcription by directly binding to a variant AP-1 site in the p53 promoter; loss of c-Jun leads to elevated p53 and p21 expression and impaired G1-CDK/E2F activation; deletion of p53 rescues all proliferation defects of c-jun-null cells, establishing p53 repression as the rate-limiting function of c-Jun in fibroblast proliferation.\",\n      \"method\": \"c-Jun null fibroblasts, p53 promoter-reporter assay, ChIP/AP-1 site mutagenesis, p53 knockout epistasis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct promoter binding assay, mutagenesis, genetic epistasis (double knockout), multiple orthogonal approaches\",\n      \"pmids\": [\"10072388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"c-Jun null embryos show impaired hepatogenesis and extensive apoptosis in fetal liver; c-jun-/- fetal liver cells can reconstitute hematopoietic compartments in lethally irradiated recipients (no cell-autonomous hematopoietic defect); heart outflow tract malformations (truncus arteriosus-like) are also observed, identifying novel roles for c-Jun in hepatocyte survival and cardiac development.\",\n      \"method\": \"Targeted gene knockout, chimeric mouse reconstitution, apoptosis assays, developmental morphology\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with transplantation rescue experiment; multiple developmental phenotypes characterized\",\n      \"pmids\": [\"10352021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SUMO-1 covalently modifies c-Jun predominantly at Lys-229; this modification negatively regulates c-Jun transcriptional activity (SUMO-1-deficient K229R mutant shows increased AP-1 transactivation). JNK activation reduces SUMO-1 modification of c-Jun; loss of the JNK phosphorylation sites Ser63/Ser73 greatly enhances SUMO-1 conjugation, linking JNK phosphorylation to decreased SUMO-1 modification.\",\n      \"method\": \"In vitro and in vivo SUMOylation assay, site-directed mutagenesis (K229R, S63A/S73A), AP-1 reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro and in vivo SUMOylation with mutagenesis and functional reporter assay; rigorous mechanistic dissection\",\n      \"pmids\": [\"10788439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"c-Jun promotes cellular survival by negatively regulating PTEN expression: c-Jun binds a variant AP-1 site in the PTEN promoter to suppress PTEN transcription, leading to Akt pathway activation; c-jun-/- fibroblasts show elevated PTEN and are sensitive to nutrient deprivation; siRNA knockdown of PTEN rescues death from c-Jun deficiency.\",\n      \"method\": \"Inducible c-Jun expression, AP-1 reporter on PTEN promoter, ChIP, siRNA knockdown epistasis, c-jun null cells\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP, promoter reporter, siRNA epistasis, null cell rescue; multiple methods in one study\",\n      \"pmids\": [\"16676006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Stable expression of a non-phosphorylatable dominant negative c-Jun(S63A,S73A) inhibits AP-1-driven transcription and increases sensitivity to DNA-damaging agents (associated with enhanced apoptosis) but does not affect sensitivity to non-DNA-damaging cytotoxic agents, demonstrating a selective protective role for phospho-c-Jun in DNA damage responses.\",\n      \"method\": \"Stable expression of dominant-negative phosphorylation mutant, AP-1 reporter assay, cytotoxicity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation-site mutant with functional readout; single lab, single method per condition\",\n      \"pmids\": [\"11352915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"c-Jun directly interacts with the oncoprotein Ski and enhances Ski association with Smad2 under basal conditions, maintaining repression of Smad2-responsive genes; TGF-β signaling induces dissociation of the c-Jun/Ski complex, relieving active repression; JNK pathway activation suppresses TGF-β-induced dissociation of c-Jun from Ski.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, TGF-β stimulation, JNK pathway manipulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP showing ternary complex plus reporter assay; single lab\",\n      \"pmids\": [\"12034730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Menin inhibits JNK-mediated phosphorylation of c-Jun (and ERK-mediated phosphorylation of JunD/Elk-1) without affecting JNK1 or ERK2 activation itself, indicating that Menin acts downstream of MAPKs to uncouple kinase activation from nuclear substrate phosphorylation; distinct N-terminal Menin domains mediate inhibition of ERK vs. JNK pathways.\",\n      \"method\": \"In vitro kinase assay, overexpression of Menin, deletion mutagenesis of Menin\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay plus domain mapping; single lab\",\n      \"pmids\": [\"12226747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"c-Jun is required for epidermal leading edge organization and wound healing; conditional deletion of c-Jun in keratinocytes prevents EGFR activation at wound edges; c-Jun controls an EGFR autocrine loop by transcriptionally regulating HB-EGF, and conditioned medium or HB-EGF rescues migration defects.\",\n      \"method\": \"Conditional knockout (epidermis-specific), scratch migration assay, EGFR activation assay, conditioned medium rescue\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with mechanistic rescue; two companion papers (PMIDs 12791271 and 12791272) both establish same pathway\",\n      \"pmids\": [\"12791271\", \"12791272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ATF2 and c-Jun physically associate; dimerization of c-Jun with ATF2 in the nucleus prevents nuclear export of ATF2 (which contains a leucine-zipper nuclear export signal), promoting transcriptional activation of the c-jun promoter; c-Jun-dependent nuclear retention of ATF2 occurs during RA-induced differentiation and UV-induced cell death.\",\n      \"method\": \"Subcellular fractionation, live-cell imaging, FRAP-like localization assays, co-immunoprecipitation, promoter reporter assay, NES/NLS mutagenesis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional consequence, Co-IP, reporter assay; single lab\",\n      \"pmids\": [\"16511568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ATF3 physically associates with c-Jun and significantly enhances c-Jun-mediated neurite sprouting in neuronal-like cell lines; co-expression of both factors beyond the additive effect of either alone suggests cooperation through direct protein–protein interaction.\",\n      \"method\": \"Co-expression/transfection, neurite sprouting assay, co-immunoprecipitation (physical association inferred)\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, indirect evidence of interaction (abstract states 'most likely mediated by a physical association'); neurite assay functional readout\",\n      \"pmids\": [\"14667575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"c-Jun contributes to p73 induction by cisplatin: c-Jun transcriptionally activates p73 and increases p73 protein stability by preventing proteasome-mediated degradation, potentiating p73 transcriptional activity and apoptosis; c-jun-/- cells are resistant to cisplatin-induced apoptosis and show defective p73 induction; re-expression of c-Jun restores sensitivity.\",\n      \"method\": \"c-Jun null cells, ectopic c-Jun expression, p73 half-life/pulse-chase, proteasome inhibitor assay, apoptosis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — null cells plus rescue, protein stability assay; single lab\",\n      \"pmids\": [\"15302867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Methylation-controlled J protein (MCJ), a Golgi-localized cochaperone, is required for c-Jun degradation; loss of MCJ leads to elevated c-Jun protein levels and c-Jun-mediated transcriptional induction of the ABCB1 drug transporter, conferring drug resistance.\",\n      \"method\": \"siRNA knockdown of MCJ, c-Jun protein stability assay, AP-1 reporter, ABCB1 expression analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — knockdown with mechanistic follow-up; single lab, limited direct interaction evidence shown in abstract\",\n      \"pmids\": [\"17283040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"c-Jun negatively regulates the myelinating Schwann cell phenotype: at physiological levels c-Jun inhibits myelin gene activation by Krox-20/EGF, drives myelinating cells back to an immature state after nerve injury, and shows cross-antagonism with Krox-20; enforced c-Jun expression inhibits myelination in co-cultures.\",\n      \"method\": \"Conditional transgenic overexpression, co-culture myelination assay, nerve transection in vivo, reporter assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo and in vitro gain-of-function with defined myelination readouts; replicated in subsequent studies\",\n      \"pmids\": [\"18490512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"c-Jun depletion inhibits 28S and 18S rRNA accumulation and causes partial translocation of RNA helicase DDX21 from the nucleolus to the nucleoplasm; c-Jun directly interacts with DDX21, and exogenous c-Jun rescues DDX21 nucleolar localization and rRNA binding, revealing a non-transcriptional, nucleolar role for c-Jun in rRNA processing.\",\n      \"method\": \"siRNA knockdown, rRNA processing assay, co-immunoprecipitation (c-Jun–DDX21 interaction), subcellular fractionation/immunofluorescence, rescue by exogenous c-Jun\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockdown + rescue + Co-IP + localization with functional rRNA processing readout; multiple orthogonal methods\",\n      \"pmids\": [\"18180292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mkp1 (a MAPK phosphatase) is a direct c-Jun target gene in sympathetic neurons: c-Jun and ATF2 bind two conserved ATF sites in the Mkp1 promoter (demonstrated by ChIP and in vitro binding); Mkp1 overexpression inhibits JNK-mediated c-Jun phosphorylation and protects neurons from apoptosis; Mkp1 knockdown accelerates death, establishing a negative feedback loop.\",\n      \"method\": \"ChIP, in vitro promoter binding, microinjection/overexpression, Mkp1 knockout mice, sympathetic neuron apoptosis assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP, in vitro binding, genetic knockout, and gain/loss-of-function all in one study\",\n      \"pmids\": [\"20702711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"c-Jun in Schwann cells directly regulates GDNF and Artemin (ligands for the Ret receptor) as novel target genes; after nerve injury, Schwann cell-specific c-Jun deletion impairs axonal regeneration and causes motoneuron death; administration of recombinant GDNF and Artemin substantially rescues regeneration defects, and neuron-specific Ret deletion recapitulates regeneration (but not survival) defects.\",\n      \"method\": \"Schwann cell-conditional c-Jun knockout, neurotrophic factor ChIP/target gene analysis, recombinant protein rescue, neuron-specific Ret knockout epistasis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO plus rescue with recombinant proteins plus genetic epistasis with Ret KO; multiple orthogonal approaches\",\n      \"pmids\": [\"22753894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"c-Jun activation in Schwann cells is a global regulator of Wallerian degeneration: c-Jun governs trophic factor expression, adhesion molecule expression, regeneration track formation, myelin clearance, and activates a repair/dedifferentiation program; c-Jun-deficient Schwann cells form a dysfunctional repair cell leading to failure of functional recovery and neuronal death.\",\n      \"method\": \"Schwann cell-conditional c-Jun knockout, nerve crush/transection injury models, functional recovery assays, gene expression analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional loss-of-function with comprehensive phenotypic analysis in multiple injury paradigms\",\n      \"pmids\": [\"22920255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"c-Jun is required for joint specification during skeletal development: c-Jun is specifically expressed in joint interzones, conditionally deleting c-Jun from limb bud mesenchyme severely impairs initiation and differentiation of all limb joints, and c-Jun directly regulates Wnt9a and Wnt16 expression in the joint interzone.\",\n      \"method\": \"Conditional knockout (limb-specific), transgenic reporter (enhancer-driven), in silico promoter screen, chromatin/functional analysis of Wnt target genes\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with specific developmental phenotype plus direct target gene regulation established\",\n      \"pmids\": [\"23475960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"c-Jun acts as a barrier to iPSC reprogramming: c-Jun activates mesenchymal-related genes and broadly suppresses pluripotency genes, blocking the obligatory mesenchymal-to-epithelial transition during reprogramming; shRNA inhibition, dominant-negative c-Jun, or Jdp2 expression enhances reprogramming and can replace Oct4 among Yamanaka factors.\",\n      \"method\": \"shRNA knockdown, dominant-negative expression, iPSC reprogramming assay, gene expression profiling\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with mechanistic gene expression analysis; single lab\",\n      \"pmids\": [\"26098572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"O-GlcNAcylation of c-Jun at Ser73 stabilizes c-Jun protein, promotes its nuclear accumulation and transcriptional activity, and enables c-Jun to directly bind the PSAT1 and CBS promoters to upregulate GSH synthesis, thereby antagonizing ferroptosis; O-GlcNAc-deficient c-Jun(S73A) mutant fails to rescue GSH synthesis or inhibit ferroptosis.\",\n      \"method\": \"OGT inhibitor/activator treatment, c-Jun-WT vs S73A mutant overexpression, ChIP on PSAT1/CBS promoters, GSH measurement, ferroptosis assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis, ChIP, and metabolite measurement; single lab\",\n      \"pmids\": [\"31394193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"USP6 deubiquitinase interacts with c-Jun, antagonizes its ubiquitination (dependent on USP6 enzyme activity), and thereby stabilizes c-Jun protein and upregulates AP-1 signaling; USP6 overexpression promotes cell invasion.\",\n      \"method\": \"DUB library screen, co-immunoprecipitation, ubiquitination assay, AP-1 reporter, invasion assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus ubiquitination assay plus functional readout; identified via screening but mechanistically validated\",\n      \"pmids\": [\"29061731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PRR7, a synaptic component, accumulates in hippocampal neuron nuclei following NMDAR activity and inhibits ubiquitination of c-Jun by E3 ligase SCF(FBW7), increasing c-Jun-dependent transcriptional activity and promoting neuronal death; PRR7 knockdown attenuates NMDAR-mediated excitotoxicity in a c-Jun-dependent manner.\",\n      \"method\": \"Synaptonuclear trafficking assay, co-immunoprecipitation (PRR7–FBW7–c-Jun), ubiquitination assay, c-Jun reporter, siRNA knockdown, excitotoxicity assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, and functional epistasis; single lab\",\n      \"pmids\": [\"27458189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KDM4B histone demethylase physically interacts with c-Jun on the promoters of IL-8, MMP1, and ITGAV via its demethylation activity, acting as a coactivator of c-Jun; depletion of KDM4B decreases integrin αV expression and cell migration.\",\n      \"method\": \"Co-immunoprecipitation, ChIP on target promoters, KDM4B knockdown, migration assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP and ChIP demonstrating physical interaction on chromatin; single lab\",\n      \"pmids\": [\"30683841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Lactate interacts with c-Jun protein to protect it from FBW7 ubiquitin-ligase-mediated degradation in myeloid cells; this was identified by LC-MS followed by CRISPR-Cas9-mediated gene disruption, positioning lactate as an intracellular sensor ligand for c-Jun stability and c-Jun as a sensor of intracellular lactate in MDSC differentiation.\",\n      \"method\": \"LC-MS metabolite–protein interaction screen, CRISPR-Cas9 gene disruption, co-immunoprecipitation, ubiquitination assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — LC-MS interaction screen plus CRISPR functional validation and ubiquitination assay; single lab\",\n      \"pmids\": [\"35263597\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"c-Jun is a bZIP transcription factor that functions as a homodimer or heterodimer (most potently with c-Fos) binding AP-1 DNA elements; its activity is positively regulated by JNK/SAPK-mediated phosphorylation of N-terminal Ser63/Ser73 (stimulated by stress, TNF-α, and growth factors) and negatively regulated by C-terminal phosphorylation (blocking DNA binding), SUMO-1 conjugation at Lys229, and ubiquitin-proteasome degradation (opposed by deubiquitinase USP6 and inhibited by PRR7/FBW7 axis); it directly represses p53 and PTEN transcription to promote cell cycle progression and survival, transcriptionally activates GDNF/Artemin and Wnt9a/Wnt16 for nerve regeneration and joint development, controls Schwann cell dedifferentiation/repair after injury, and engages in protein–protein interactions with GR, AR, MyoD, Rb, ATF2, DDX21, Ski, and KDM4B to modulate transcriptional programs across multiple cell types.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"c-Jun is a bZIP transcription factor that binds AP-1 DNA elements as a homodimer or, with ~25-fold higher affinity, as a heterodimer with c-Fos, providing the combinatorial basis for AP-1 target selection [#0]. Its transactivation is switched on by N-terminal phosphorylation of two serines (Ser63/Ser73) in the transactivation domain: MAP kinases respond to mitogens, phorbol esters, and Ras [#2], while a dedicated subfamily of stress-activated kinases (SAPK/JNK) responds to cellular stress and TNF-\\u03b1 and docks on c-Jun's delta-region and an auxiliary site in the DNA-binding domain [#5, #10]. DNA binding is reciprocally controlled by the phosphorylation state of a C-terminal Thr/Ser cluster, coupling intramolecular signal transduction to activity [#6]. c-Jun protein levels are set by competing post-translational inputs: multi-ubiquitination targets it for degradation (a determinant residing in the N-terminal delta-domain), SUMO-1 conjugation at Lys229 dampens activity in a manner relieved by JNK phosphorylation, and stability is further tuned by the deubiquitinase USP6, the FBW7/PRR7 axis, O-GlcNAcylation at Ser73, and intracellular lactate sensing [#9, #16, #34, #35, #33, #37]. Through these activities c-Jun drives proliferation and survival by directly repressing the p53 and PTEN promoters and activating cyclin D1, and it is an essential effector of Ras-induced transformation [#14, #17, #13, #7]. Genetically, c-Jun is required for fetal hepatogenesis, hepatocyte survival, and cardiac outflow tract development [#4, #15], for keratinocyte wound healing via an HB-EGF/EGFR autocrine loop [#21], for joint specification through direct control of Wnt9a/Wnt16 [#31], and for Schwann cell dedifferentiation and the repair program of Wallerian degeneration, where it activates GDNF and Artemin to support axonal regeneration [#26, #30, #29]. c-Jun additionally modulates transcriptional programs through direct protein interactions with nuclear receptors (GR, AR), MyoD, Rb, ATF2, Ski, and the chromatin modifier KDM4B [#1, #8, #3, #11, #22, #19, #36], and has a non-transcriptional nucleolar role in rRNA processing via interaction with DDX21 [#27].\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"Established the molecular basis of AP-1 DNA recognition by defining c-Jun's homo- versus heterodimeric binding modes.\",\n      \"evidence\": \"In vitro translation with gel retardation and co-translation dimerization assays\",\n      \"pmids\": [\"3142692\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address in vivo target selection\", \"No structural detail on the dimer interface beyond the leucine zipper requirement\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Showed c-Jun activity is integrated with nuclear receptor signaling through DNA-binding-independent mutual repression with the glucocorticoid receptor.\",\n      \"evidence\": \"Reporter assays, mutant analysis, and gel retardation with bacterially expressed proteins\",\n      \"pmids\": [\"2169353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether repression is via direct contact or competition for cofactors\", \"Physiological contexts of crosstalk not defined\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Identified the activating N-terminal serine phosphorylation that links mitogen/Ras signaling to c-Jun transactivation, and a parallel protein-interaction repression of MyoD-driven myogenesis.\",\n      \"evidence\": \"In vitro kinase assays with site mapping, reporter assays, and co-IP/in vitro binding with mutagenesis\",\n      \"pmids\": [\"1922387\", \"1310896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The principal physiological N-terminal kinase was not yet identified\", \"Mechanism of MyoD repression downstream of binding not fully defined\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Defined the JNK/SAPK pathway as the dedicated stress/TNF-\\u03b1 route to c-Jun, distinguishing it from mitogen-activated ERKs.\",\n      \"evidence\": \"Molecular cloning with in vitro kinase substrate specificity profiling and cell stimulation\",\n      \"pmids\": [\"8177321\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream kinase cascade not fully mapped\", \"Substrate scope beyond c-Jun not delineated here\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Revealed intramolecular regulation: C-terminal dephosphorylation activates DNA binding as an indirect consequence of N-terminal phosphorylation.\",\n      \"evidence\": \"Phosphorylation-site mutagenesis with DNA-binding assays under phorbol ester stimulation\",\n      \"pmids\": [\"7744008\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphatase responsible for C-terminal dephosphorylation not identified\", \"Single-lab mechanistic inference\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Placed c-Jun as an essential effector of Ras transformation and clarified its differential turnover relative to JunD.\",\n      \"evidence\": \"c-jun null fibroblast transformation assays with rescue; in vivo ubiquitination and pulse-chase with delta-domain mutants; modified two-hybrid for AR interaction\",\n      \"pmids\": [\"8754851\", \"8922589\", \"8798722\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase responsible for c-Jun ubiquitination not identified at this stage\", \"AR interaction shown by a single interaction method\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Mapped JNK docking on c-Jun and identified Rb and the ERK pathway as positive regulators of c-Jun-dependent transcription and neuronal differentiation.\",\n      \"evidence\": \"Reciprocal co-IP and in vitro binding with purified proteins; cell-cycle synchronized co-IP/reporter; PC12 gain/loss-of-function differentiation assays\",\n      \"pmids\": [\"9837920\", \"9545246\", \"9687508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of the auxiliary JNK-binding site uncertain\", \"Rb activation of c-Jun studied in limited cell types\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined the core proliferative/survival outputs of c-Jun: cyclin D1 activation, direct p53 promoter repression as the rate-limiting proliferation function, and anti-apoptotic protection.\",\n      \"evidence\": \"c-jun null fibroblasts, promoter-reporter assays, AP-1 site mutagenesis, S63A/S73A mutants, and p53 knockout epistasis; fetal liver knockout phenotyping with hematopoietic reconstitution\",\n      \"pmids\": [\"9878062\", \"10072388\", \"10352021\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation-independent cyclin D1 control mechanism not fully resolved\", \"Tissue specificity of p53 repression not broadly tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified SUMO-1 at Lys229 as a negative regulator antagonized by JNK phosphorylation, and PTEN repression as a survival mechanism activating Akt.\",\n      \"evidence\": \"In vitro/in vivo SUMOylation with K229R and S63A/S73A mutants and AP-1 reporters; PTEN promoter ChIP/reporter with siRNA epistasis in null cells\",\n      \"pmids\": [\"10788439\", \"16676006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO E3 ligase and dynamics in vivo not defined\", \"Crosstalk between SUMO and ubiquitin pathways on c-Jun not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrated phospho-c-Jun confers selective protection against DNA-damaging agents.\",\n      \"evidence\": \"Stable dominant-negative S63A/S73A expression with AP-1 reporter and cytotoxicity assays\",\n      \"pmids\": [\"11352915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Target genes mediating DNA-damage protection not identified\", \"Single-lab correlative apoptosis readout\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extended c-Jun's regulatory network to TGF-\\u03b2 (via Ski/Smad2 repression) and revealed Menin as a downstream uncoupler of MAPK activation from c-Jun phosphorylation.\",\n      \"evidence\": \"Co-IP of c-Jun/Ski/Smad2 ternary complex with reporter and TGF-\\u03b2/JNK manipulation; in vitro kinase assays with Menin domain mapping\",\n      \"pmids\": [\"12034730\", \"12226747\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect nature of Menin's inhibition unresolved\", \"Ski complex dynamics shown in single lab\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Established c-Jun's roles in epidermal wound healing via an HB-EGF/EGFR autocrine loop and in mutual nuclear retention with ATF2.\",\n      \"evidence\": \"Epidermis-conditional knockout with migration and EGFR assays and HB-EGF rescue; subcellular fractionation/imaging with NES/NLS mutagenesis and co-IP; ATF3 co-expression neurite assay\",\n      \"pmids\": [\"12791271\", \"12791272\", \"16511568\", \"14667575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ATF2 nuclear-retention mechanism studied in limited contexts\", \"ATF3\\u2013c-Jun physical interaction only inferred\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed c-Jun potentiates chemotherapy-induced apoptosis by transcriptionally inducing and stabilizing p73.\",\n      \"evidence\": \"c-jun null cells with rescue, p73 half-life/pulse-chase, proteasome inhibition, and apoptosis assays\",\n      \"pmids\": [\"15302867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of p73 protein stabilization by c-Jun not defined\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined c-Jun as a negative regulator of Schwann cell myelination and identified a non-transcriptional nucleolar role in rRNA processing via DDX21.\",\n      \"evidence\": \"Conditional/transgenic Schwann cell overexpression with co-culture and nerve-transection assays; siRNA knockdown with rescue, co-IP, localization, and rRNA processing readout\",\n      \"pmids\": [\"18490512\", \"18180292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of c-Jun's nucleolar function beyond DDX21 binding unclear\", \"Cross-antagonism with Krox-20 mechanism not fully resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established a JNK\\u2013c-Jun\\u2013Mkp1 negative feedback loop controlling neuronal apoptosis.\",\n      \"evidence\": \"ChIP and in vitro promoter binding, microinjection/overexpression, Mkp1 knockout mice, and sympathetic neuron apoptosis assays\",\n      \"pmids\": [\"20702711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of the feedback loop beyond sympathetic neurons not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined c-Jun as the master regulator of the Schwann cell repair program in Wallerian degeneration, directly activating GDNF and Artemin to drive axonal regeneration.\",\n      \"evidence\": \"Schwann cell-conditional knockout, target gene ChIP, recombinant GDNF/Artemin rescue, Ret knockout epistasis, and injury/recovery models\",\n      \"pmids\": [\"22753894\", \"22920255\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full transcriptional repertoire of the repair program not enumerated\", \"Separation of regeneration versus survival outputs incompletely defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified c-Jun as required for limb joint specification through direct regulation of Wnt9a and Wnt16.\",\n      \"evidence\": \"Limb-conditional knockout, enhancer reporters, promoter screen, and chromatin/functional analysis of Wnt genes\",\n      \"pmids\": [\"23475960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals positioning c-Jun in the joint interzone not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed c-Jun as a barrier to iPSC reprogramming by enforcing mesenchymal identity and suppressing pluripotency genes.\",\n      \"evidence\": \"shRNA knockdown, dominant-negative expression, reprogramming assays, and expression profiling\",\n      \"pmids\": [\"26098572\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct target genes mediating the MET block not fully defined\", \"Single-lab functional study\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected c-Jun stability and activity to metabolic and redox state via O-GlcNAcylation, USP6 deubiquitination, and the PRR7/FBW7 axis.\",\n      \"evidence\": \"OGT modulation with S73A mutant, PSAT1/CBS ChIP and ferroptosis assays; DUB screen with co-IP/ubiquitination; synaptonuclear trafficking with PRR7\\u2013FBW7\\u2013c-Jun co-IP and excitotoxicity assays\",\n      \"pmids\": [\"31394193\", \"29061731\", \"27458189\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interplay among the multiple stability inputs not integrated\", \"Each axis validated in a single lab/cell context\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified KDM4B as a chromatin-associated coactivator of c-Jun on pro-migratory target promoters.\",\n      \"evidence\": \"Co-IP, ChIP on IL-8/MMP1/ITGAV promoters, KDM4B knockdown, and migration assays\",\n      \"pmids\": [\"30683841\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether demethylase catalytic activity is strictly required for coactivation not fully resolved\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established lactate as an intracellular ligand that protects c-Jun from FBW7-mediated degradation, making c-Jun a metabolic sensor in myeloid differentiation.\",\n      \"evidence\": \"LC-MS metabolite\\u2013protein interaction screen, CRISPR disruption, co-IP, and ubiquitination assays\",\n      \"pmids\": [\"35263597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Lactate-binding site on c-Jun not mapped\", \"Single-lab/single-system observation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple, sometimes opposing post-translational inputs (phosphorylation, SUMOylation, ubiquitination, O-GlcNAcylation, metabolite binding) are integrated to set c-Jun activity and stability in a given cell context remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified quantitative model of c-Jun regulatory inputs\", \"Structural basis for metabolite (lactate) sensing unknown\", \"Context-specific E3 ligase usage not systematically mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 13, 14, 17, 31, 29]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 14, 17]},\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [22, 16]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 5, 10]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 14, 17, 31, 29]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [13, 14]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 21, 31, 30]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [13, 15, 24, 28, 33]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [\"AP-1\"],\n    \"partners\": [\"FOS\", \"JNK\", \"GR\", \"AR\", \"MyoD\", \"RB1\", \"ATF2\", \"DDX21\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}