{"gene":"MAPK10","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1997,"finding":"JNK3 (encoded by Jnk3) is required for excitotoxic glutamate-receptor agonist (kainic acid)-induced hippocampal neuron apoptosis and seizure activity in mice; Jnk3 knockout mice show markedly reduced phosphorylation of c-Jun and AP-1 transcriptional activity following kainic acid treatment, placing JNK3 upstream of c-Jun/AP-1 in the excitotoxic apoptosis pathway.","method":"Jnk3 germline knockout mice, kainic acid excitotoxicity model, c-Jun phosphorylation and AP-1 reporter assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular phenotype and molecular endpoint (c-Jun phosphorylation, AP-1 activity), independently cited and foundational study","pmids":["9349820"],"is_preprint":false},{"year":1998,"finding":"Crystal structure of unphosphorylated JNK3 in complex with an ATP analog reveals a typical kinase fold with a well-ordered ATP-binding site; the unphosphorylated enzyme adopts an open conformation with misaligned catalytic residues and a phosphorylation lip that partially occludes the substrate-binding site, accounting for low basal activity.","method":"X-ray crystallography (crystal structure of JNK3 with ATP analog adenylyl imidodiphosphate)","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution crystal structure with functional interpretation of catalytic residue misalignment; first JNK structure, widely replicated structurally","pmids":["9739089"],"is_preprint":false},{"year":1995,"finding":"p493F12 (JNK3) autophosphorylates both threonine and tyrosine residues in vitro and is exclusively expressed in the nervous system, consistent with a MAP kinase family member.","method":"Autophosphorylation in vitro assay, cDNA molecular characterization, Northern blot / immunochemistry for tissue expression","journal":"Neuron","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro kinase autophosphorylation demonstrated in single foundational study; tissue expression by immunochemistry, single lab","pmids":["7826642"],"is_preprint":false},{"year":2000,"finding":"Beta-arrestin 2 directly binds JNK3 (identified by yeast two-hybrid and co-immunoprecipitation from mouse brain and COS-7 cells) and scaffolds the ASK1–MKK4–JNK3 signaling module; beta-arrestin 2 causes cytosolic retention of JNK3 and enhances ASK1-stimulated JNK3 phosphorylation. Angiotensin II receptor (AT1A) stimulation triggers co-localization of beta-arrestin 2 and active JNK3 to intracellular vesicles.","method":"Yeast two-hybrid screen, reciprocal co-immunoprecipitation from mouse brain and transfected COS-7 cells, confocal co-localization, JNK3 kinase phosphorylation assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP in native tissue and transfected cells plus functional phosphorylation assay and receptor stimulation; widely replicated finding","pmids":["11090355"],"is_preprint":false},{"year":2000,"finding":"Full activation of JNK3α1 requires both MKK4 and MKK7: MKK7 alone monophosphorylates Thr on JNK3α1 conferring ~250-fold increase in Vmax, while MKK4 alone produces no detectable phosphorylation or activity increase; bisphosphorylation by MKK4+MKK7 confers ~715-fold increase in Vmax. Threonine monophosphorylation by MKK7 is sufficient for measurable JNK3 activity.","method":"In vitro kinase reconstitution with purified MKK4, MKK7, and JNK3α1; mass spectrometry phosphorylation mapping; steady-state kinetics (kcat, Km)","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro phosphorylation with mass spectrometry and kinetic characterization; clear mechanistic resolution of MKK4 vs MKK7 contributions","pmids":["10715136"],"is_preprint":false},{"year":2001,"finding":"The RRSLHL motif in the C-terminal domain of beta-arrestin 2 is the JNK3 docking site; replacing these residues with the corresponding KP residues of beta-arrestin 1 abrogates both JNK3 binding and enhancement of JNK3 phosphorylation by MKK4. The specific step enhanced by beta-arrestin 2 scaffold activity is phosphorylation of JNK3 by MKK4.","method":"Chimeric beta-arrestin constructs, site-directed mutagenesis, co-immunoprecipitation, JNK3 phosphorylation assays in transfected cells","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis plus binding and functional phosphorylation assays, two orthogonal methods, mechanistically definitive","pmids":["11356842"],"is_preprint":false},{"year":2001,"finding":"JNK3 directly binds and phosphorylates SCG10 (a neuronal microtubule regulator) at Ser-62 and Ser-73 in vitro; this phosphorylation reduces SCG10's microtubule-destabilizing activity. Endogenous SCG10 undergoes increased phosphorylation in sympathetic neurons during NGF deprivation coincident with JNK3 activation.","method":"In vitro kinase assay with purified proteins, phosphorylation site mapping, microtubule destabilization assay, co-immunoprecipitation (tight/specific binding of SCG10 to JNK3), sympathetic neuron NGF deprivation model","journal":"FEBS Letters","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with site identification, functional consequence (reduced microtubule destabilization), and cell-based confirmation","pmids":["11718727"],"is_preprint":false},{"year":2001,"finding":"JNK3 is required for c-Jun phosphorylation and induction and subsequent apoptosis in sympathetic neurons deprived of NGF; oxidative stress following NGF deprivation is normal in JNK3-deficient neurons, placing JNK3 specifically in the c-Jun activation branch rather than upstream of ROS.","method":"Sympathetic neurons from Jnk3 knockout mice, NGF deprivation model, quantitative c-Jun phosphorylation, c-jun mRNA induction, apoptosis scoring","journal":"Journal of Neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined molecular readouts (c-Jun phosphorylation vs. oxidative stress), clean dissection of pathway; single lab but multiple orthogonal endpoints","pmids":["11461965"],"is_preprint":false},{"year":2002,"finding":"JNK3 phosphorylates c-Jun (N-terminal phosphorylation) and ATF-2 in PC12 cells, with differential substrate choice depending on context: UV/taxol-induced cell death is associated with ATF-2 phosphorylation, while NGF-induced differentiation is associated with c-Jun phosphorylation and increased neurite outgrowth.","method":"JNK3-p54 transfection in PC12 cells (JNK3-null background), kinase substrate phosphorylation assays, neurite length/number quantification, UV and taxol treatments","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in JNK3-null cells with two orthogonal substrate readouts and cellular phenotypes; single lab","pmids":["12401814"],"is_preprint":false},{"year":2002,"finding":"JNK3 (together with GSK-3β and ΔMEKKl) phosphorylates tau at multiple pathological epitopes including AT100 in COS-7 cells, and co-expression of these kinases leads to detergent-insoluble, Thioflavin-S-reactive short tau fibrils (oligomeric pretangle formation).","method":"Adenovirus-mediated co-expression of tau, ΔMEKK, JNK3, and GSK-3β in COS-7 cells; immunoblotting for tau phospho-epitopes; Thioflavin-S staining; detergent solubility fractionation","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based co-expression with multiple phospho-epitope and aggregation readouts; single lab","pmids":["12191990"],"is_preprint":false},{"year":2003,"finding":"Targeted deletion of Jnk3 reduces stress-induced JNK activity in the brain and protects against neuronal death after cerebral ischemia-hypoxia; downstream mechanism includes reduced induction of Bim and Fas and attenuated mitochondrial cytochrome c release.","method":"Jnk3 knockout mice, cerebral ischemia-hypoxia model, JNK activity assays, Bim/Fas expression, cytochrome c immunoblotting","journal":"Proceedings of the National Academy of Sciences of the USA","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined molecular mechanism (Bim/Fas induction, cytochrome c release); multiple orthogonal endpoints","pmids":["14657393"],"is_preprint":false},{"year":2003,"finding":"Crystal structures of JNK3 in complex with three classes of ATP-competitive inhibitors reveal the atomic interactions at the active site and provide structural basis for potency and selectivity over p38 and other MAP kinases.","method":"X-ray crystallography (four crystal structures of JNK3-inhibitor complexes)","journal":"Chemistry & Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple crystal structures with distinct inhibitor classes; direct structural mechanistic data","pmids":["12954329"],"is_preprint":false},{"year":1997,"finding":"JNK3 (as well as JNK1 and JNK2) phosphorylates mouse p53 at serine 34 in vitro and associates with p53 in vivo in 293T cells; a dominant-negative JNK1 mutant does not phosphorylate p53, confirming that kinase activity is required.","method":"In vitro kinase assay, dominant-negative mutant, co-immunoprecipitation from 293T cells","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro kinase assay and Co-IP in a single study; the finding is for all three JNK isoforms and not JNK3-specific alone","pmids":["9393873"],"is_preprint":false},{"year":2005,"finding":"JNK3 (but not JNK1 or JNK2) phosphorylates APP at Thr668 during neuronal differentiation in primary neurons, disrupting the AICD–Fe65 stabilizing interaction and downregulating AICD-mediated nuclear signaling. JNK3 thus physiologically limits APP signaling.","method":"Primary neuron cultures, JNK isoform-selective siRNA and genetic KO, APP Thr668 phosphorylation immunoblot, AICD-Fe65 co-immunoprecipitation, nuclear AICD localization assay","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — isoform-specific KO/knockdown plus direct substrate phosphorylation assay and interaction disruption; multiple orthogonal approaches","pmids":["15944381"],"is_preprint":false},{"year":2006,"finding":"All four arrestin subtypes (including rod, cone, arrestin-2, and arrestin-3) in their basal (inactive receptor-unbound) conformation bind JNK3 and Mdm2 and re-localize them from the nucleus to the cytoplasm in HEK293 cells. Arrestin mutants 'frozen' in the basal conformation are most efficacious, indicating that free arrestin is likely pre-loaded with JNK3 before receptor binding.","method":"GFP-JNK3 and GFP-Mdm2 nuclear exclusion assay in HEK293 cells, arrestin conformation mutants, co-expression and fluorescence microscopy","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — subcellular localization assay with defined functional consequence and conformational mutants; multiple arrestin variants tested; single lab","pmids":["16737965"],"is_preprint":false},{"year":2007,"finding":"After spinal cord injury, JNK3 phosphorylates Mcl-1 at Ser121 (a Pro-directed site), which displaces Pin1 from its stabilizing Thr163-Pro binding site on Mcl-1 and promotes Mcl-1 ubiquitination and degradation, thereby releasing cytochrome c and triggering oligodendrocyte apoptosis. JNK3-/- mice show reduced Mcl-1 degradation and reduced cytochrome c release, while Pin1-/- mice show the opposite.","method":"In vitro kinase assay (JNK3 phosphorylation of Mcl-1), co-immunoprecipitation (Pin1-Mcl-1), ubiquitination assay, JNK3-/- and Pin1-/- mice, cytochrome c release, oligodendrocyte apoptosis quantification","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase substrate identification, genetic KO with opposing phenotypes, multiple orthogonal biochemical endpoints; single lab but mechanistically rigorous","pmids":["17670986"],"is_preprint":false},{"year":2007,"finding":"MyD88-5 (a neuronal adaptor) co-immunoprecipitates with JNK3 and recruits JNK3 from the cytosol to mitochondria in vitro; MyD88-5 co-purifies with mitochondria and co-localizes with JNK3 in neurons. MyD88-5-deficient hippocampal neurons are protected from oxygen-glucose deprivation-induced death.","method":"Co-immunoprecipitation, subcellular fractionation and co-purification with mitochondria, MyD88-5/GFP BAC transgenic mice, MyD88-5 knockout neurons, oxygen-glucose deprivation model","journal":"The Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, subcellular fractionation with mitochondrial co-purification, and functional KO phenotype; multiple orthogonal methods","pmids":["17724133"],"is_preprint":false},{"year":2007,"finding":"JNK3 signaling in cerebral ischemia/reperfusion activates mitochondrial ceramide synthase via post-translational mechanisms, leading to ceramide accumulation in mitochondria that damages the respiratory chain; JNK3-deficient mice show abolished ceramide generation and respiratory chain damage following IR.","method":"Ceramide mass measurement, ceramide synthase activity assay, mitochondrial fractionation, JNK3-/- mice, cerebral ischemia/reperfusion model","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — enzymatic activity assay in mitochondria, genetic KO with defined biochemical endpoint; multiple methods in single study","pmids":["17609208"],"is_preprint":false},{"year":2009,"finding":"Pathogenic huntingtin (polyQ-Htt) activates JNK3 (not JNK1) in neurons; activated JNK3 phosphorylates a specific residue in the kinesin-1 motor domain (identified by mass spectrometry), reducing kinesin-1 binding to microtubules and thereby inhibiting fast axonal transport.","method":"Squid axoplasm FAT assay, cellular and mouse HD models, JNK3 siRNA, mass spectrometry identification of kinesin-1 phosphorylation site, kinesin-1 microtubule binding assay","journal":"Nature Neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — mass spectrometry substrate identification, mechanistic FAT assay in squid axoplasm, RNAi and genetic models; multiple orthogonal approaches","pmids":["19525941"],"is_preprint":false},{"year":2009,"finding":"SDF-1α activates JNK3 in endothelial cells via eNOS-dependent production of NO, which S-nitrosylates MKP7 and inactivates it, preventing MKP7 from dephosphorylating and inactivating JNK3; active JNK3 is critical for SDF-1α-induced endothelial cell migration.","method":"Co-immunoprecipitation, eNOS knockdown/inhibition, S-nitrosylation assay, MKP7 phosphatase activity assay, cell migration assay, JNK3 activity assay","journal":"Proceedings of the National Academy of Sciences of the USA","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical assays (S-nitrosylation, phosphatase activity, kinase activity) plus functional migration endpoint; single lab","pmids":["19307591"],"is_preprint":false},{"year":2011,"finding":"Arrestin-3 (β-arrestin 2) residue Val-343 is the key contributor to JNK3 activation, with Leu-278, Ser-280, His-350, Asp-351, His-352, and Ile-353 playing supporting roles. Both N- and C-terminal domains of arrestin-3 are involved, with the C-terminal domain more important. The strength of binding of ASK1 or JNK3 to arrestin does not correlate with the ability to promote JNK3 phosphorylation.","method":"Arrestin-2/3 chimeras and point mutants, co-immunoprecipitation, JNK3 phosphorylation assay in cells","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis of interaction residues with functional phosphorylation readout; single lab, two methods","pmids":["21715332"],"is_preprint":false},{"year":2011,"finding":"PrPC modulates GluR6/7-PSD-95-mediated JNK3 activation; in Prnp-null mice, kainate triggers enhanced GluR6-PSD-95 interaction and JNK3 pathway activation. Double Prnp/Jnk3 knockout mice are protected from kainate neurotoxicity, placing JNK3 downstream of the PrPC-GluR6/PSD-95 signaling axis.","method":"Prnp-/- and Jnk3-/- single and double knockout mice, kainic acid model, pharmacological JNK3 inhibition, AMPA/KA receptor antagonists, co-immunoprecipitation of GluR6-PSD-95","journal":"Molecular Biology of the Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double KO, pharmacological inhibition, and biochemical interaction data; multiple orthogonal approaches","pmids":["21757544"],"is_preprint":false},{"year":2012,"finding":"Aβ42 activates AMPK→mTOR inhibition→ER stress→JNK3 activation; activated JNK3 phosphorylates APP at T668, facilitating APP endocytosis and amyloidogenic processing, creating a feed-forward loop that perpetuates Aβ42 production. Deletion of JNK3 from FAD mice dramatically reduces Aβ42 levels and plaque load and improves cognition.","method":"JNK3-/- mice, FAD mouse model, pharmacological translation blockade, APP T668 phosphorylation immunoblot, Aβ42 ELISA, APP endocytosis assay, Morris water maze","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO in FAD model with defined substrate (APP T668), mechanistic pathway epistasis, multiple in vivo endpoints; single lab but highly comprehensive","pmids":["22958823"],"is_preprint":false},{"year":2012,"finding":"JNK2 and JNK3 are the isoforms activated in injured axons of retinal ganglion cells following axonal injury; combined deficiency of Jnk2 and Jnk3 provides robust long-term protection against axonal injury-induced RGC death and prevents JUN phosphorylation, demonstrating that JNK2/JNK3-JUN signaling is the major pathway triggering RGC death.","method":"Single and combined Jnk2/Jnk3 knockout mice, optic nerve crush axonal injury model, JUN phosphorylation immunostaining, RGC survival counting, BRN3B expression","journal":"Neurobiology of Disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with isoform-specific and double KO, multiple molecular and cellular endpoints; single lab but comprehensive","pmids":["22353563"],"is_preprint":false},{"year":2013,"finding":"Arrestin-3 directly interacts with MKK7 in addition to MKK4 and JNK3α2 (using purified proteins); binding of JNK3α2 to arrestin-3 promotes arrestin-3 interaction with MKK4 while reducing its binding to MKK7. The optimal arrestin-3 concentration for scaffolding MKK7-JNK3α2 is ~10-fold higher than for MKK4-JNK3α2, revealing a concentration-dependent scaffold mechanism.","method":"In vitro binding assays with purified proteins, co-immunoprecipitation in intact cells, JNK3α2 phosphorylation assay","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified proteins plus cell-based validation; two orthogonal methods; first demonstration that bound kinase regulates scaffold-upstream kinase interactions","pmids":["23960075"],"is_preprint":false},{"year":2013,"finding":"Truncated JNK3 proteins associated with intellectual disability patients, although capable of weak interaction with JNK scaffolds, cannot phosphorylate c-Jun in vitro. JNK3 interacts with PSD-95, SAP102, and SHANK3 (identified as novel partners), and JNK3 phosphorylates PSD-95 in vitro, whereas disease-associated truncated JNK3 does not. JNK3 and PSD-95 co-localize at synaptic sites in hippocampal neurons.","method":"In vitro kinase assay (c-Jun and PSD-95 substrates), co-immunoprecipitation for scaffold binding, yeast two-hybrid and immunoprecipitation for new binding partners, immunofluorescence in hippocampal neurons","journal":"Human Genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assays with wild-type vs. disease mutants, new substrate/partner identification, synaptic co-localization; multiple orthogonal methods","pmids":["23329067"],"is_preprint":false},{"year":2013,"finding":"JNK3 undergoes palmitoylation in response to excitotoxic NMDA stimulation or overexpression of the palmitoyl transferase zD17, causing association with the Golgi complex independently of kinase activity. Golgi-associated JNK3 binds the phosphatase Sac1, increasing Sac1 at the Golgi and depleting PI4P, thereby inhibiting post-Golgi secretory trafficking of AMPA receptor subunit GluR1.","method":"Palmitoylation assay, JNK3 kinase-dead and palmitoylation-deficient mutants, Golgi fractionation, Sac1 co-immunoprecipitation, PI4P immunostaining, GluR1 surface trafficking assay, peptide disruption experiments in primary neurons","journal":"Science Signaling","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple mutant constructs, lipid modification biochemistry, Golgi fractionation, PI4P quantification, and functional trafficking readout; mechanistically comprehensive","pmids":["23838184"],"is_preprint":false},{"year":2015,"finding":"EphrinB2 signaling represses JNK3 activity via STAT1; phosphotyrosine-EphrinB2 activates STAT1, which suppresses JNK3. In the absence of JNK3, hyaloid vessel physiological pruning is impaired, demonstrating that JNK3 activation causes endothelial cell death required for vessel pruning.","method":"Jnk3 knockout mice, EphrinB2 signaling constructs, STAT1 signaling assays, hyaloid vessel imaging, retinal vascular analysis","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined vascular phenotype; upstream signaling pathway delineated via epistasis; multiple methods","pmids":["25807892"],"is_preprint":false},{"year":2016,"finding":"A short 25-residue peptide from arrestin-3 (the JNK3-binding element) also binds MKK4, MKK7, and ASK1 and is sufficient to enhance JNK3 activity in cells. The homologous arrestin-2 peptide (differing in four positions) binds MKK4 but not MKK7 or JNK3 and cannot enhance JNK3 activation, identifying the minimal scaffold element.","method":"Binding assays with purified proteins and peptides, JNK3 phosphorylation assay in cells, comparison of arrestin-2 vs. arrestin-3 peptides","journal":"Scientific Reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — biochemical binding assays and functional cell assay; single lab; minimal scaffold identification","pmids":["26868142"],"is_preprint":false},{"year":2017,"finding":"KLF9 transcription factor suppresses axon growth through direct interaction with MAPK10/JNK3; JNK3 is required for KLF9's axon-growth-suppressive activity. Mutation of two JNK3-phosphorylation acceptor sites on KLF9 (Ser106 and Ser110), or disruption of the JNK3-binding domain of KLF9, abolishes neurite growth suppression in vitro and promotes axon regeneration in vivo.","method":"Co-immunoprecipitation (KLF9-JNK3 interaction), site-directed mutagenesis (Ser106/Ser110), shRNA knockdown, neurite outgrowth assay, optic nerve crush regeneration in rats","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding, substrate phosphorylation sites identified, mutagenesis, in vitro and in vivo functional endpoints; multiple orthogonal methods","pmids":["28871032"],"is_preprint":false},{"year":2018,"finding":"Arrestin-3 shows >15-fold higher affinity for inactive JNK3 than for active (phosphorylated) JNK3, with a shift in binding site upon JNK3 activation. Catalytic phosphorylation of JNK3 at Thr-221 by MKK7 is ~100-fold faster than phosphorylation of Tyr-223 by MKK4 (with or without arrestin-3). Release of activated JNK3 from the scaffold is essential for signal amplification, suggesting a 'conveyor belt' mechanism.","method":"Binding affinity measurements (phosphorylated vs. unphosphorylated JNK3), systems biochemistry modeling with Bayesian inference, in vitro phosphorylation kinetics","journal":"Proceedings of the National Academy of Sciences of the USA","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative binding measurements, kinetic characterization of phosphorylation rates, computational modeling; multiple orthogonal approaches; mechanistically definitive","pmids":["30591558"],"is_preprint":false},{"year":2019,"finding":"The β1 strand of arrestin-3 is the major interaction site with JNK3; C-lobe regions near the activation loop of JNK3 form the JNK3 interface with arrestin-3, and this interface is variable depending on ATP-binding status. C-terminal truncation of arrestin-3 (pre-activation) facilitates the arrestin-3/JNK3 interaction by exposing the buried β1 strand.","method":"Hydrogen/deuterium exchange mass spectrometry, 19F-NMR, tryptophan-induced Atto 655 fluorescence quenching, C-terminal truncation mutants","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Moderate — three orthogonal structural/biophysical methods (HDX-MS, NMR, fluorescence quenching) identifying interaction interfaces; single lab","pmids":["31080119"],"is_preprint":false},{"year":2022,"finding":"DLK (MAP3K) and JNK3 are coupled by palmitoylation: JNK3 catalyzes positive feedback phosphorylation of DLK that further activates DLK, locking the DLK-JNK3 module in a highly active state. Both DLK and JNK3 are endogenously palmitoylated, which targets them to the same axonal vesicles. JNK3 palmitoylation is essential for axonal retrograde prodegenerative signaling after optic nerve crush in vivo; JNK2 and JNK3 (but not JNK1) promote prodegenerative axon-to-soma signaling.","method":"Palmitoylation assays (acyl-RAC), in vitro DLK phosphorylation by JNK3, optic nerve crush in vivo, JNK isoform knockdown/KO, axonal retrograde signaling assays, vesicle co-localization","journal":"Science Signaling","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay, palmitoylation biochemistry, genetic isoform dissection, in vivo optic nerve model; multiple orthogonal methods","pmids":["35349303"],"is_preprint":false},{"year":2020,"finding":"DLK (Map3k12) associates with and activates JNK3 in pancreatic beta cells; Dlk overexpression increases JNK3 activity, and this DLK-JNK3 cascade stimulates expression of cyclins Ccnd1 and Ccnd2, which are required for postnatal beta-cell replication. Silencing of Dlk or Jnk3 in neonatal islet cells markedly reduces beta-cell replication and cyclin expression.","method":"Co-immunoprecipitation (DLK-JNK3 interaction), JNK3 kinase activity assay, Dlk/Jnk3 siRNA knockdown in neonatal islet cells, cyclin expression by RT-PCR/immunoblot, beta-cell replication quantification","journal":"Cellular and Molecular Life Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct Co-IP, kinase activity assay, loss-of-function with defined downstream targets (cyclin D1/D2); multiple orthogonal methods in same study","pmids":["32189007"],"is_preprint":false},{"year":2009,"finding":"JNK3 is protected from dephosphorylation/inactivation by MKP7 when MKP7 is associated with the beta-arrestin 2 scaffold; angiotensin II receptor stimulation causes rapid (within 5 min) dissociation of MKP7 from beta-arrestin 2, permitting JNK3 activation, followed by reassociation of MKP7 with beta-arrestin 2 on endocytic vesicles at 30-60 min.","method":"Co-immunoprecipitation (MKP7–beta-arrestin 2 interaction), JNK3 dephosphorylation assay, AT1aR stimulation time course, endosome localization assay","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical interaction and phosphatase activity assays with receptor stimulation time course; single lab","pmids":["15888437"],"is_preprint":false},{"year":2012,"finding":"In insulin-secreting cells, JNK3 (but not JNK1 or JNK2) knockdown decreases IRS2 protein expression and blocks Akt2 (but not Akt1) activation by insulin, via reduced FoxO3A activity (FoxO3A controls IRS2 expression). JNK3 silencing in these cells increases c-Jun levels. JNK3 thus maintains IRS2–Akt2 pro-survival signaling in beta cells.","method":"JNK3/JNK1/JNK2 isoform-specific siRNA in INS-1E cells, IRS2/Akt2 immunoblotting, FoxO3A activity assay, c-Jun quantification","journal":"PloS One","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific knockdown with defined molecular pathway endpoints; single lab","pmids":["22563476"],"is_preprint":false},{"year":2008,"finding":"Combined deficiency of Jnk2 and Jnk3 (but not either alone) completely abrogates apoptosis of dopamine neurons in the substantia nigra in a 6-hydroxydopamine model, with full protection of the cell soma but no protection of axons, demonstrating that JNK2/JNK3 together specifically mediate apoptotic somal death via distinct mechanisms from axon degeneration.","method":"Single and double Jnk2/Jnk3 knockout mice, intrastriatal 6-OHDA model, dopamine neuron counting, axon degeneration assessment","journal":"Journal of Neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous genetic epistasis with double KO, clear dissection of soma vs. axon degeneration pathways","pmids":["19014392"],"is_preprint":false},{"year":2016,"finding":"A novel zebrafish mapk10 (ortholog of MAPK10/JNK3) loss-of-function mutation reduces enteric neuron numbers, and introduction of mapk10 mutations into ret heterozygous zebrafish enhances the enteric nervous system deficit, supporting MAPK10 as a Hirschsprung disease susceptibility/modifier locus.","method":"Zebrafish mapk10 loss-of-function mutants, genetic epistasis with ret heterozygotes, live imaging of ENS progenitor migration, neuron counting","journal":"PLoS Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in zebrafish model organism; loss-of-function with defined cellular phenotype (ENS neuron number) and modifier interaction","pmids":["27902697"],"is_preprint":false},{"year":2017,"finding":"AICD (APP intracellular domain) interacts with the JNK3 gene locus and upregulates JNK3 expression after optic nerve axotomy (demonstrated by ChIP and luciferase reporter assay); JNK3 upregulation contributes to retinal ganglion cell death. APP knockout reduces ONA-induced JNK3 and pJNK expression, and gamma-secretase inhibitors similarly reduce JNK3 expression and protect RGCs.","method":"Microarray/pathway analysis, chromatin immunoprecipitation (AICD at JNK3 locus), luciferase reporter assay, APP KO mice, gamma-secretase inhibitor treatment, JNK3 immunoblot, RGC survival counting","journal":"Cell Death and Differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay for transcriptional regulation, genetic KO with molecular and cellular endpoints; multiple orthogonal methods","pmids":["29238071"],"is_preprint":false}],"current_model":"MAPK10/JNK3 is a neuronally enriched serine/threonine MAP kinase that is activated by dual phosphorylation (Thr-221 primarily by MKK7, Tyr-223 by MKK4) and is scaffolded by beta-arrestin 2/arrestin-3 (via the ASK1–MKK4/7–JNK3 module) to phosphorylate substrates including c-Jun, ATF-2, p53 (Ser34), APP (Thr668), kinesin-1, Mcl-1 (Ser121), SCG10 (Ser62/73), PSD-95, and KLF9 (Ser106/110); it mediates excitotoxic, ischemic, and stress-induced neuronal apoptosis (via c-Jun/AP-1, Bim/Fas, cytochrome c release, and ceramide synthase activation), inhibits secretory trafficking at the Golgi via palmitoylation-dependent Sac1 binding and PI4P depletion, drives prodegenerative axon-to-soma signaling through a positive feedback loop with DLK kinase (also requiring palmitoylation), suppresses axon regeneration by phosphorylating KLF9, and in non-neuronal contexts (pancreatic beta cells) promotes postnatal cell proliferation via a DLK–JNK3–cyclin D1/D2 axis and protects beta cells from cytokine-induced apoptosis through IRS2–Akt2 signaling maintenance."},"narrative":{"mechanistic_narrative":"MAPK10/JNK3 is a neuronally enriched stress-activated MAP kinase that serves as a central effector of neuronal apoptosis and degeneration, acting upstream of c-Jun/AP-1 transcriptional activation in excitotoxic and trophic-deprivation death pathways [PMID:9349820, PMID:11461965]. It is fully activated by dual phosphorylation: MKK7 catalyzes the rate-limiting Thr-221 monophosphorylation (~100-fold faster than MKK4-mediated Tyr-223 phosphorylation) sufficient for measurable activity, while bisphosphorylation by MKK4 plus MKK7 maximizes catalysis [PMID:10715136, PMID:30591558], a configuration rationalized by structures showing the unphosphorylated enzyme adopts an open, catalytically misaligned conformation [PMID:9739089]. Arrestin-3/beta-arrestin 2 scaffolds the ASK1–MKK4/7–JNK3 module through a defined C-terminal element, preferentially binding inactive JNK3 and releasing it upon activation in a 'conveyor belt' amplification mechanism that drives receptor-coupled signaling and cytosolic retention [PMID:11090355, PMID:21715332, PMID:23960075, PMID:30591558]. JNK3 phosphorylates a broad neuronal substrate set—c-Jun and ATF-2 [PMID:12401814], p53 at Ser34 [PMID:9393873], APP at Thr668 [PMID:15944381], SCG10 at Ser62/73 [PMID:11718727], kinesin-1 [PMID:19525941], Mcl-1 at Ser121 [PMID:17670986], PSD-95 [PMID:23329067], and KLF9 at Ser106/110 [PMID:28871032]—coupling it to apoptosis (Bim/Fas induction and cytochrome c release [PMID:14657393], mitochondrial ceramide synthase activation [PMID:17609208]), impaired axonal transport [PMID:19525941], synaptic signaling [PMID:23329067], and suppression of axon regeneration [PMID:28871032]. Through a feed-forward loop, JNK3 phosphorylation of APP-T668 promotes amyloidogenic processing in Alzheimer models [PMID:22958823], while AICD transcriptionally upregulates the JNK3 locus after axonal injury [PMID:29238071]. Beyond canonical kinase signaling, palmitoylation directs JNK3 to the Golgi where it binds the phosphatase Sac1 to deplete PI4P and inhibit secretory trafficking [PMID:23838184], and couples it to DLK on axonal vesicles in a positive-feedback module driving retrograde prodegenerative signaling [PMID:35349303]. In non-neuronal contexts JNK3 acts through a DLK–JNK3–cyclin D axis to promote postnatal beta-cell replication and maintains IRS2–Akt2 pro-survival signaling [PMID:32189007, PMID:22563476]. A zebrafish loss-of-function study links mapk10 to enteric nervous system development as a Hirschsprung disease modifier [PMID:27902697], and truncated JNK3 variants that cannot phosphorylate c-Jun or PSD-95 are associated with intellectual disability [PMID:23329067].","teleology":[{"year":1995,"claim":"Established JNK3 as a nervous-system-restricted MAP kinase capable of dual Thr/Tyr autophosphorylation, defining it as a distinct neuronal stress kinase.","evidence":"in vitro autophosphorylation, cDNA characterization, and tissue expression by Northern/immunochemistry","pmids":["7826642"],"confidence":"Medium","gaps":["No upstream activators or physiological substrates identified","Function in vivo not addressed"]},{"year":1997,"claim":"Demonstrated that JNK3 is genetically required for excitotoxic neuronal apoptosis, placing it upstream of c-Jun/AP-1 in the death pathway and establishing its disease relevance.","evidence":"Jnk3 germline knockout mice in a kainic acid excitotoxicity model with c-Jun phosphorylation and AP-1 reporter readouts","pmids":["9349820"],"confidence":"High","gaps":["Direct substrate phosphorylation by JNK3 not shown biochemically","Mechanism of JNK3 activation not addressed"]},{"year":1997,"claim":"Showed JNK3 can phosphorylate p53 at Ser34 and associate with it, expanding the candidate substrate repertoire toward apoptotic regulators.","evidence":"in vitro kinase assay, dominant-negative mutant, and Co-IP in 293T cells","pmids":["9393873"],"confidence":"Medium","gaps":["Finding shared across JNK1/2/3, not JNK3-specific","In vivo relevance of p53-Ser34 phosphorylation by JNK3 untested"]},{"year":1998,"claim":"Provided the structural basis for JNK3's low basal activity and ATP-binding architecture, explaining why dual phosphorylation is required for activation.","evidence":"X-ray crystallography of unphosphorylated JNK3 with an ATP analog","pmids":["9739089"],"confidence":"High","gaps":["No structure of the activated/bisphosphorylated enzyme","Substrate-bound conformation not resolved"]},{"year":2000,"claim":"Defined the dual-kinase activation logic, showing MKK7 monophosphorylation of Thr is sufficient for activity while MKK4+MKK7 bisphosphorylation maximizes catalysis.","evidence":"in vitro reconstitution with purified MKK4/MKK7/JNK3, mass spectrometry site mapping, and steady-state kinetics","pmids":["10715136"],"confidence":"High","gaps":["Cellular regulation of MKK4 vs MKK7 input not addressed","Role of scaffolds in vivo not established here"]},{"year":2000,"claim":"Identified beta-arrestin 2 as a direct JNK3 scaffold linking GPCR signaling to the ASK1–MKK4–JNK3 module and controlling JNK3 subcellular localization.","evidence":"yeast two-hybrid, reciprocal Co-IP from brain and COS-7 cells, confocal co-localization, and kinase assays with AT1A receptor stimulation","pmids":["11090355"],"confidence":"High","gaps":["Scaffold-binding residues not yet mapped","Quantitative effect on activation kinetics unresolved"]},{"year":2001,"claim":"Mapped the arrestin-3 RRSLHL docking motif and showed it enhances the specific MKK4→JNK3 phosphorylation step, defining the scaffold mechanism at residue resolution.","evidence":"arrestin chimeras, site-directed mutagenesis, Co-IP, and JNK3 phosphorylation assays","pmids":["11356842"],"confidence":"High","gaps":["MKK7 contribution to the scaffold not addressed here","In vivo requirement of the motif untested"]},{"year":2001,"claim":"Identified SCG10 as a direct neuronal substrate phosphorylated at Ser62/73, linking JNK3 to microtubule dynamics during trophic deprivation.","evidence":"in vitro kinase assay with site mapping, microtubule destabilization assay, Co-IP, and NGF-deprivation neuron model","pmids":["11718727"],"confidence":"High","gaps":["Functional consequence for axon morphology in vivo not shown","JNK3 isoform specificity for SCG10 not tested"]},{"year":2001,"claim":"Placed JNK3 specifically in the c-Jun activation branch of NGF-deprivation apoptosis, distinct from ROS generation.","evidence":"sympathetic neurons from Jnk3 KO mice with c-Jun phosphorylation, c-jun mRNA, oxidative stress, and apoptosis readouts","pmids":["11461965"],"confidence":"High","gaps":["Direct JNK3-c-Jun phosphorylation in these neurons not isolated from other JNKs","Mechanism upstream of JNK3 activation unaddressed"]},{"year":2002,"claim":"Showed context-dependent substrate choice (ATF-2 in death vs c-Jun in differentiation), indicating JNK3 outputs depend on stimulus.","evidence":"JNK3 gain-of-function in JNK3-null PC12 cells with substrate phosphorylation and neurite outgrowth readouts","pmids":["12401814"],"confidence":"Medium","gaps":["Molecular basis for substrate selectivity not defined","Single overexpression system"]},{"year":2002,"claim":"Implicated JNK3 in pathological tau phosphorylation and aggregation, connecting it to neurodegenerative proteinopathy.","evidence":"adenoviral co-expression of tau, MEKK, JNK3, GSK-3beta in COS-7 with phospho-epitope immunoblot, Thioflavin-S, and solubility assays","pmids":["12191990"],"confidence":"Medium","gaps":["JNK3-specific contribution vs co-expressed kinases not isolated","No neuronal or in vivo validation"]},{"year":2003,"claim":"Defined the mitochondrial apoptotic effector arm of JNK3 in ischemia, via Bim/Fas induction and cytochrome c release.","evidence":"Jnk3 KO mice in cerebral ischemia-hypoxia model with JNK activity, Bim/Fas, and cytochrome c readouts","pmids":["14657393"],"confidence":"High","gaps":["Direct JNK3 substrates linking to Bim/Fas not identified","Transcriptional vs post-translational control unresolved"]},{"year":2003,"claim":"Provided atomic-level basis for selective ATP-competitive JNK3 inhibition over related MAP kinases.","evidence":"X-ray crystallography of four JNK3-inhibitor complexes","pmids":["12954329"],"confidence":"High","gaps":["No allosteric or substrate-site inhibition explored","Cellular efficacy not assessed in this work"]},{"year":2005,"claim":"Identified APP-Thr668 as a JNK3-isoform-specific substrate that physiologically limits APP/AICD nuclear signaling.","evidence":"primary neurons with isoform-selective siRNA/KO, APP-T668 immunoblot, AICD-Fe65 Co-IP, and nuclear localization assays","pmids":["15944381"],"confidence":"High","gaps":["In vivo consequence for APP processing not addressed here","Upstream activator of JNK3 in differentiation unknown"]},{"year":2005,"claim":"Revealed dynamic scaffold-coupled phosphatase control, with MKP7 dissociation from beta-arrestin 2 enabling transient JNK3 activation after receptor stimulation.","evidence":"Co-IP of MKP7–beta-arrestin 2, JNK3 dephosphorylation assays, and AT1aR stimulation time course","pmids":["15888437"],"confidence":"Medium","gaps":["Signal triggering MKP7 dissociation not defined","Single-lab biochemistry without in vivo confirmation"]},{"year":2006,"claim":"Showed that basal (receptor-unbound) arrestins pre-load JNK3 and exclude it from the nucleus, implying scaffold engagement precedes receptor activation.","evidence":"GFP-JNK3 nuclear exclusion assay in HEK293 with arrestin conformation mutants","pmids":["16737965"],"confidence":"Medium","gaps":["Physiological relevance of nuclear exclusion to JNK3 signaling unclear","Overexpression-based localization readout"]},{"year":2007,"claim":"Defined the MyD88-5 adaptor as the route targeting JNK3 to mitochondria in ischemic death.","evidence":"reciprocal Co-IP, mitochondrial co-purification, MyD88-5 KO neurons, and oxygen-glucose deprivation model","pmids":["17724133"],"confidence":"High","gaps":["JNK3 mitochondrial substrates not identified","Relationship to arrestin scaffolding unaddressed"]},{"year":2007,"claim":"Identified Mcl-1 Ser121 as a JNK3 substrate whose phosphorylation displaces Pin1 to promote Mcl-1 degradation and oligodendrocyte apoptosis after spinal cord injury.","evidence":"in vitro kinase assay, Pin1-Mcl-1 Co-IP, ubiquitination assay, and JNK3-/- vs Pin1-/- mice with cytochrome c readouts","pmids":["17670986"],"confidence":"High","gaps":["Direct in vivo demonstration of Mcl-1 Ser121 phosphorylation by JNK3 limited","Generality across cell types untested"]},{"year":2007,"claim":"Linked JNK3 to mitochondrial ceramide synthase activation as a lipid-based mechanism of respiratory chain damage in ischemia/reperfusion.","evidence":"ceramide mass and synthase activity assays, mitochondrial fractionation, and JNK3-/- mice in IR model","pmids":["17609208"],"confidence":"High","gaps":["Molecular target of JNK3 controlling ceramide synthase unknown","Post-translational mechanism not defined"]},{"year":2009,"claim":"Established a polyQ-huntingtin–JNK3–kinesin-1 axis that impairs fast axonal transport, mechanistically connecting JNK3 to Huntington disease.","evidence":"squid axoplasm FAT assay, HD models, JNK3 siRNA, MS substrate site identification, and kinesin-microtubule binding assay","pmids":["19525941"],"confidence":"High","gaps":["Kinesin-1 phospho-site consequence in mammalian neurons in vivo not shown","Activation route of JNK3 by polyQ-Htt undefined"]},{"year":2009,"claim":"Uncovered a non-neuronal endothelial role: SDF-1alpha activates JNK3 via NO-dependent S-nitrosylation/inactivation of MKP7, driving cell migration.","evidence":"Co-IP, eNOS knockdown, S-nitrosylation and phosphatase assays, and migration assays","pmids":["19307591"],"confidence":"High","gaps":["JNK3 substrates driving migration not identified","In vivo endothelial relevance not tested here"]},{"year":2011,"claim":"Mapped arrestin-3 residues (notably Val-343) required for JNK3 activation, showing scaffold catalysis is uncoupled from binding strength.","evidence":"arrestin chimeras/point mutants, Co-IP, and JNK3 phosphorylation assays","pmids":["21715332"],"confidence":"Medium","gaps":["Structural basis of catalysis-vs-binding decoupling unresolved","In vivo significance of these residues untested"]},{"year":2011,"claim":"Placed JNK3 downstream of a PrPC–GluR6/7–PSD-95 signaling axis in excitotoxicity using genetic epistasis.","evidence":"Prnp/Jnk3 single and double KO mice, kainate model, pharmacological inhibition, and GluR6-PSD-95 Co-IP","pmids":["21757544"],"confidence":"High","gaps":["Direct biochemical link from PSD-95 complex to JNK3 activation not defined","Receptor-proximal activation step unmapped"]},{"year":2012,"claim":"Defined a feed-forward Abeta42→JNK3→APP-T668 loop perpetuating amyloidogenesis, with JNK3 deletion reducing plaque load and improving cognition.","evidence":"JNK3-/- in FAD mice, translation blockade, APP-T668 immunoblot, Abeta42 ELISA, endocytosis assay, and behavioral testing","pmids":["22958823"],"confidence":"High","gaps":["Direct in vivo demonstration of JNK3 catalysis on APP-T668 within the loop limited","Contribution of other JNKs not fully excluded"]},{"year":2012,"claim":"Revealed a JNK3-specific pro-survival role in beta cells via maintenance of IRS2–Akt2 signaling through FoxO3A.","evidence":"isoform-specific siRNA in INS-1E cells with IRS2/Akt2 immunoblot, FoxO3A activity, and c-Jun readouts","pmids":["22563476"],"confidence":"Medium","gaps":["In vivo beta-cell survival role untested","Direct JNK3 substrates in this pathway not identified"]},{"year":2012,"claim":"Established JNK2/JNK3-JUN as the major axonal-injury death pathway in retinal ganglion cells via genetic epistasis.","evidence":"single and combined Jnk2/Jnk3 KO mice, optic nerve crush, JUN phosphorylation, and RGC survival counting","pmids":["22353563"],"confidence":"High","gaps":["Distinct contributions of JNK2 vs JNK3 not resolved","Direct JUN phosphorylation by JNK3 not isolated"]},{"year":2013,"claim":"Discovered a palmitoylation-driven, kinase-activity-independent Golgi function whereby JNK3 binds Sac1 to deplete PI4P and inhibit secretory trafficking of GluR1.","evidence":"palmitoylation assays, kinase-dead and palmitoylation-deficient mutants, Golgi fractionation, Sac1 Co-IP, PI4P imaging, and GluR1 trafficking assays","pmids":["23838184"],"confidence":"High","gaps":["In vivo significance of Golgi trafficking inhibition not established","Identity of the JNK3 palmitoyltransferase in vivo unconfirmed"]},{"year":2013,"claim":"Linked truncating JNK3 variants to intellectual disability and identified PSD-95/SAP102/SHANK3 as synaptic partners plus PSD-95 as a substrate.","evidence":"in vitro kinase assays (c-Jun, PSD-95) comparing wild-type vs disease mutants, Co-IP, Y2H, and synaptic immunofluorescence","pmids":["23329067"],"confidence":"High","gaps":["Causality of variants via family/rescue not fully established","Functional consequence of PSD-95 phosphorylation in vivo untested"]},{"year":2013,"claim":"Showed arrestin-3 directly binds MKK7 in addition to MKK4 and JNK3, with concentration-dependent and ligand-state-dependent scaffold assembly.","evidence":"in vitro binding with purified proteins, cell Co-IP, and JNK3 phosphorylation assays","pmids":["23960075"],"confidence":"High","gaps":["In vivo relevance of concentration-dependent scaffolding unknown","ASK1 incorporation kinetics not addressed"]},{"year":2015,"claim":"Defined a physiological developmental role: EphrinB2-STAT1 represses JNK3 to control endothelial death during hyaloid vessel pruning.","evidence":"Jnk3 KO mice, EphrinB2/STAT1 signaling constructs, and vascular imaging","pmids":["25807892"],"confidence":"High","gaps":["Direct JNK3 substrates in endothelial apoptosis not identified","Molecular link from STAT1 to JNK3 repression unmapped"]},{"year":2016,"claim":"Identified a minimal 25-residue arrestin-3 element sufficient to bind MKK4/7 and ASK1 and enhance JNK3 activation, distinguishing it from arrestin-2.","evidence":"peptide binding assays with purified proteins and cellular JNK3 phosphorylation assays","pmids":["26868142"],"confidence":"Medium","gaps":["Structural mechanism of peptide-mediated catalysis unresolved","Single-lab validation"]},{"year":2016,"claim":"Linked mapk10 to enteric nervous system development as a Hirschsprung disease modifier through interaction with ret.","evidence":"zebrafish mapk10 loss-of-function mutants with ret epistasis and ENS neuron imaging/counting","pmids":["27902697"],"confidence":"Medium","gaps":["Mammalian/human ENS role not confirmed","Molecular pathway connecting MAPK10 to RET undefined"]},{"year":2017,"claim":"Defined JNK3 as a required effector of KLF9-mediated axon-growth suppression via phosphorylation at Ser106/110, with site mutation promoting regeneration.","evidence":"KLF9-JNK3 Co-IP, Ser106/110 mutagenesis, shRNA, neurite assays, and optic nerve crush regeneration in rats","pmids":["28871032"],"confidence":"High","gaps":["Mechanism by which phospho-KLF9 suppresses transcription not detailed","Upstream JNK3 activation in this context unmapped"]},{"year":2017,"claim":"Established transcriptional autoregulation: AICD binds the JNK3 locus to upregulate its expression after axotomy, contributing to RGC death.","evidence":"ChIP at JNK3 locus, luciferase reporter, APP KO mice, gamma-secretase inhibitors, and RGC survival assays","pmids":["29238071"],"confidence":"High","gaps":["Direct transcription-factor partners of AICD at the locus unresolved","Generalizability beyond optic nerve injury untested"]},{"year":2018,"claim":"Quantified the activation/release logic of the arrestin-3 scaffold, showing preferential binding of inactive JNK3, faster Thr-221 than Tyr-223 phosphorylation, and a 'conveyor belt' amplification requiring product release.","evidence":"binding affinity measurements, in vitro phosphorylation kinetics, and Bayesian systems-biochemistry modeling","pmids":["30591558"],"confidence":"High","gaps":["In vivo validation of the conveyor-belt model lacking","Regulation of release rate by physiological cues unknown"]},{"year":2019,"claim":"Mapped the arrestin-3/JNK3 interface at structural resolution, identifying the arrestin-3 beta1 strand and ATP-status-dependent JNK3 C-lobe contacts.","evidence":"HDX-MS, 19F-NMR, fluorescence quenching, and C-terminal truncation mutants","pmids":["31080119"],"confidence":"High","gaps":["No full co-complex crystal/cryo-EM structure","Single-lab biophysical characterization"]},{"year":2020,"claim":"Defined a non-neuronal proliferative role via a DLK–JNK3–cyclin D1/D2 axis required for postnatal beta-cell replication.","evidence":"DLK-JNK3 Co-IP, kinase activity assays, Dlk/Jnk3 siRNA in neonatal islets, cyclin expression, and replication quantification","pmids":["32189007"],"confidence":"High","gaps":["Direct JNK3 substrate driving cyclin induction not identified","In vivo genetic confirmation in beta cells limited"]},{"year":2022,"claim":"Revealed a palmitoylation-dependent DLK-JNK3 positive-feedback module on axonal vesicles that drives retrograde prodegenerative signaling after injury.","evidence":"acyl-RAC palmitoylation assays, in vitro DLK phosphorylation by JNK3, isoform KO/knockdown, vesicle co-localization, and in vivo optic nerve crush","pmids":["35349303"],"confidence":"High","gaps":["DLK phospho-site phosphorylated by JNK3 not mapped","Palmitoyltransferase responsible in vivo unconfirmed"]},{"year":null,"claim":"How JNK3's distinct subcellular pools (arrestin-cytosolic, mitochondrial, Golgi, axonal-vesicular) are coordinated to select among its many substrates and dictate apoptotic versus trafficking versus proliferative outputs remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unified model coupling localization to substrate choice","Substrates linking JNK3 to mitochondrial ceramide synthase and Bim/Fas induction unidentified","Human disease causality (intellectual disability, Hirschsprung) rests on partial genetic evidence"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,6,13,15,18,29]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[4,6,8,15,29]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,8]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,14]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[16,17]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[26]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[3,32]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,10,15,36]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4,30]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[18,22,25,37]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,8]}],"complexes":["ASK1–MKK4/7–JNK3 arrestin-3 scaffold module","DLK–JNK3 module"],"partners":["ARRB2","MAP2K7","MAP2K4","MAP3K12","DLG4","SCG10","KLF9","MYD88"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P53779","full_name":"Mitogen-activated protein kinase 10","aliases":["MAP kinase p49 3F12","Stress-activated protein kinase 1b","SAPK1b","Stress-activated protein kinase JNK3","c-Jun N-terminal kinase 3"],"length_aa":464,"mass_kda":52.6,"function":"Serine/threonine-protein kinase involved in various processes such as neuronal proliferation, differentiation, migration and programmed cell death. Extracellular stimuli such as pro-inflammatory cytokines or physical stress stimulate the stress-activated protein kinase/c-Jun N-terminal kinase (SAP/JNK) signaling pathway. In this cascade, two dual specificity kinases MAP2K4/MKK4 and MAP2K7/MKK7 phosphorylate and activate MAPK10/JNK3. In turn, MAPK10/JNK3 phosphorylates a number of transcription factors, primarily components of AP-1 such as JUN and ATF2 and thus regulates AP-1 transcriptional activity. Plays regulatory roles in the signaling pathways during neuronal apoptosis. Phosphorylates the neuronal microtubule regulator STMN2. Acts in the regulation of the amyloid-beta precursor protein/APP signaling during neuronal differentiation by phosphorylating APP. Also participates in neurite growth in spiral ganglion neurons. Phosphorylates the CLOCK-BMAL1 heterodimer and plays a role in the photic regulation of the circadian clock (PubMed:22441692). Phosphorylates JUND and this phosphorylation is inhibited in the presence of MEN1 (PubMed:22327296)","subcellular_location":"Cytoplasm; Membrane; Nucleus; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/P53779/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MAPK10","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MAPK10","total_profiled":1310},"omim":[{"mim_id":"618065","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 1D; PCH1D","url":"https://www.omim.org/entry/618065"},{"mim_id":"616786","title":"MITOGEN-ACTIVATED PROTEIN KINASE-BINDING PROTEIN 1; MAPKBP1","url":"https://www.omim.org/entry/616786"},{"mim_id":"607218","title":"INTERFERON REGULATORY FACTOR 5; IRF5","url":"https://www.omim.org/entry/607218"},{"mim_id":"607175","title":"DUAL-SPECIFICITY PHOSPHATASE 16; DUSP16","url":"https://www.omim.org/entry/607175"},{"mim_id":"605431","title":"MITOGEN-ACTIVATED PROTEIN KINASE 8-INTERACTING PROTEIN 3; MAPK8IP3","url":"https://www.omim.org/entry/605431"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":73.7}],"url":"https://www.proteinatlas.org/search/MAPK10"},"hgnc":{"alias_symbol":["JNK3","p493F12","p54bSAPK"],"prev_symbol":["PRKM10"]},"alphafold":{"accession":"P53779","domains":[{"cath_id":"3.30.200.20","chopping":"47-148","consensus_level":"medium","plddt":93.0544,"start":47,"end":148},{"cath_id":"1.10.510.10","chopping":"151-211_225-371","consensus_level":"medium","plddt":94.1891,"start":151,"end":371}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P53779","model_url":"https://alphafold.ebi.ac.uk/files/AF-P53779-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P53779-F1-predicted_aligned_error_v6.png","plddt_mean":79.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MAPK10","jax_strain_url":"https://www.jax.org/strain/search?query=MAPK10"},"sequence":{"accession":"P53779","fasta_url":"https://rest.uniprot.org/uniprotkb/P53779.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P53779/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P53779"}},"corpus_meta":[{"pmid":"9349820","id":"PMC_9349820","title":"Absence 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Arrestin-3/JNK3 Interaction.","date":"2019","source":"Structure (London, England : 1993)","url":"https://pubmed.ncbi.nlm.nih.gov/31080119","citation_count":19,"is_preprint":false},{"pmid":"32189007","id":"PMC_32189007","title":"The Map3k12 (Dlk)/JNK3 signaling pathway is required for pancreatic beta-cell proliferation during postnatal development.","date":"2020","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/32189007","citation_count":19,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50254,"output_tokens":10860,"usd":0.156831,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":21385,"output_tokens":10030,"usd":0.178838,"stage2_stop_reason":"end_turn"},"total_usd":0.335669,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"JNK3 (encoded by Jnk3) is required for excitotoxic glutamate-receptor agonist (kainic acid)-induced hippocampal neuron apoptosis and seizure activity in mice; Jnk3 knockout mice show markedly reduced phosphorylation of c-Jun and AP-1 transcriptional activity following kainic acid treatment, placing JNK3 upstream of c-Jun/AP-1 in the excitotoxic apoptosis pathway.\",\n      \"method\": \"Jnk3 germline knockout mice, kainic acid excitotoxicity model, c-Jun phosphorylation and AP-1 reporter assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular phenotype and molecular endpoint (c-Jun phosphorylation, AP-1 activity), independently cited and foundational study\",\n      \"pmids\": [\"9349820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Crystal structure of unphosphorylated JNK3 in complex with an ATP analog reveals a typical kinase fold with a well-ordered ATP-binding site; the unphosphorylated enzyme adopts an open conformation with misaligned catalytic residues and a phosphorylation lip that partially occludes the substrate-binding site, accounting for low basal activity.\",\n      \"method\": \"X-ray crystallography (crystal structure of JNK3 with ATP analog adenylyl imidodiphosphate)\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution crystal structure with functional interpretation of catalytic residue misalignment; first JNK structure, widely replicated structurally\",\n      \"pmids\": [\"9739089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"p493F12 (JNK3) autophosphorylates both threonine and tyrosine residues in vitro and is exclusively expressed in the nervous system, consistent with a MAP kinase family member.\",\n      \"method\": \"Autophosphorylation in vitro assay, cDNA molecular characterization, Northern blot / immunochemistry for tissue expression\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro kinase autophosphorylation demonstrated in single foundational study; tissue expression by immunochemistry, single lab\",\n      \"pmids\": [\"7826642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Beta-arrestin 2 directly binds JNK3 (identified by yeast two-hybrid and co-immunoprecipitation from mouse brain and COS-7 cells) and scaffolds the ASK1–MKK4–JNK3 signaling module; beta-arrestin 2 causes cytosolic retention of JNK3 and enhances ASK1-stimulated JNK3 phosphorylation. Angiotensin II receptor (AT1A) stimulation triggers co-localization of beta-arrestin 2 and active JNK3 to intracellular vesicles.\",\n      \"method\": \"Yeast two-hybrid screen, reciprocal co-immunoprecipitation from mouse brain and transfected COS-7 cells, confocal co-localization, JNK3 kinase phosphorylation assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP in native tissue and transfected cells plus functional phosphorylation assay and receptor stimulation; widely replicated finding\",\n      \"pmids\": [\"11090355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Full activation of JNK3α1 requires both MKK4 and MKK7: MKK7 alone monophosphorylates Thr on JNK3α1 conferring ~250-fold increase in Vmax, while MKK4 alone produces no detectable phosphorylation or activity increase; bisphosphorylation by MKK4+MKK7 confers ~715-fold increase in Vmax. Threonine monophosphorylation by MKK7 is sufficient for measurable JNK3 activity.\",\n      \"method\": \"In vitro kinase reconstitution with purified MKK4, MKK7, and JNK3α1; mass spectrometry phosphorylation mapping; steady-state kinetics (kcat, Km)\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro phosphorylation with mass spectrometry and kinetic characterization; clear mechanistic resolution of MKK4 vs MKK7 contributions\",\n      \"pmids\": [\"10715136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The RRSLHL motif in the C-terminal domain of beta-arrestin 2 is the JNK3 docking site; replacing these residues with the corresponding KP residues of beta-arrestin 1 abrogates both JNK3 binding and enhancement of JNK3 phosphorylation by MKK4. The specific step enhanced by beta-arrestin 2 scaffold activity is phosphorylation of JNK3 by MKK4.\",\n      \"method\": \"Chimeric beta-arrestin constructs, site-directed mutagenesis, co-immunoprecipitation, JNK3 phosphorylation assays in transfected cells\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis plus binding and functional phosphorylation assays, two orthogonal methods, mechanistically definitive\",\n      \"pmids\": [\"11356842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"JNK3 directly binds and phosphorylates SCG10 (a neuronal microtubule regulator) at Ser-62 and Ser-73 in vitro; this phosphorylation reduces SCG10's microtubule-destabilizing activity. Endogenous SCG10 undergoes increased phosphorylation in sympathetic neurons during NGF deprivation coincident with JNK3 activation.\",\n      \"method\": \"In vitro kinase assay with purified proteins, phosphorylation site mapping, microtubule destabilization assay, co-immunoprecipitation (tight/specific binding of SCG10 to JNK3), sympathetic neuron NGF deprivation model\",\n      \"journal\": \"FEBS Letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with site identification, functional consequence (reduced microtubule destabilization), and cell-based confirmation\",\n      \"pmids\": [\"11718727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"JNK3 is required for c-Jun phosphorylation and induction and subsequent apoptosis in sympathetic neurons deprived of NGF; oxidative stress following NGF deprivation is normal in JNK3-deficient neurons, placing JNK3 specifically in the c-Jun activation branch rather than upstream of ROS.\",\n      \"method\": \"Sympathetic neurons from Jnk3 knockout mice, NGF deprivation model, quantitative c-Jun phosphorylation, c-jun mRNA induction, apoptosis scoring\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined molecular readouts (c-Jun phosphorylation vs. oxidative stress), clean dissection of pathway; single lab but multiple orthogonal endpoints\",\n      \"pmids\": [\"11461965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"JNK3 phosphorylates c-Jun (N-terminal phosphorylation) and ATF-2 in PC12 cells, with differential substrate choice depending on context: UV/taxol-induced cell death is associated with ATF-2 phosphorylation, while NGF-induced differentiation is associated with c-Jun phosphorylation and increased neurite outgrowth.\",\n      \"method\": \"JNK3-p54 transfection in PC12 cells (JNK3-null background), kinase substrate phosphorylation assays, neurite length/number quantification, UV and taxol treatments\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in JNK3-null cells with two orthogonal substrate readouts and cellular phenotypes; single lab\",\n      \"pmids\": [\"12401814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"JNK3 (together with GSK-3β and ΔMEKKl) phosphorylates tau at multiple pathological epitopes including AT100 in COS-7 cells, and co-expression of these kinases leads to detergent-insoluble, Thioflavin-S-reactive short tau fibrils (oligomeric pretangle formation).\",\n      \"method\": \"Adenovirus-mediated co-expression of tau, ΔMEKK, JNK3, and GSK-3β in COS-7 cells; immunoblotting for tau phospho-epitopes; Thioflavin-S staining; detergent solubility fractionation\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based co-expression with multiple phospho-epitope and aggregation readouts; single lab\",\n      \"pmids\": [\"12191990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Targeted deletion of Jnk3 reduces stress-induced JNK activity in the brain and protects against neuronal death after cerebral ischemia-hypoxia; downstream mechanism includes reduced induction of Bim and Fas and attenuated mitochondrial cytochrome c release.\",\n      \"method\": \"Jnk3 knockout mice, cerebral ischemia-hypoxia model, JNK activity assays, Bim/Fas expression, cytochrome c immunoblotting\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the USA\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined molecular mechanism (Bim/Fas induction, cytochrome c release); multiple orthogonal endpoints\",\n      \"pmids\": [\"14657393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Crystal structures of JNK3 in complex with three classes of ATP-competitive inhibitors reveal the atomic interactions at the active site and provide structural basis for potency and selectivity over p38 and other MAP kinases.\",\n      \"method\": \"X-ray crystallography (four crystal structures of JNK3-inhibitor complexes)\",\n      \"journal\": \"Chemistry & Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple crystal structures with distinct inhibitor classes; direct structural mechanistic data\",\n      \"pmids\": [\"12954329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"JNK3 (as well as JNK1 and JNK2) phosphorylates mouse p53 at serine 34 in vitro and associates with p53 in vivo in 293T cells; a dominant-negative JNK1 mutant does not phosphorylate p53, confirming that kinase activity is required.\",\n      \"method\": \"In vitro kinase assay, dominant-negative mutant, co-immunoprecipitation from 293T cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro kinase assay and Co-IP in a single study; the finding is for all three JNK isoforms and not JNK3-specific alone\",\n      \"pmids\": [\"9393873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"JNK3 (but not JNK1 or JNK2) phosphorylates APP at Thr668 during neuronal differentiation in primary neurons, disrupting the AICD–Fe65 stabilizing interaction and downregulating AICD-mediated nuclear signaling. JNK3 thus physiologically limits APP signaling.\",\n      \"method\": \"Primary neuron cultures, JNK isoform-selective siRNA and genetic KO, APP Thr668 phosphorylation immunoblot, AICD-Fe65 co-immunoprecipitation, nuclear AICD localization assay\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific KO/knockdown plus direct substrate phosphorylation assay and interaction disruption; multiple orthogonal approaches\",\n      \"pmids\": [\"15944381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"All four arrestin subtypes (including rod, cone, arrestin-2, and arrestin-3) in their basal (inactive receptor-unbound) conformation bind JNK3 and Mdm2 and re-localize them from the nucleus to the cytoplasm in HEK293 cells. Arrestin mutants 'frozen' in the basal conformation are most efficacious, indicating that free arrestin is likely pre-loaded with JNK3 before receptor binding.\",\n      \"method\": \"GFP-JNK3 and GFP-Mdm2 nuclear exclusion assay in HEK293 cells, arrestin conformation mutants, co-expression and fluorescence microscopy\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — subcellular localization assay with defined functional consequence and conformational mutants; multiple arrestin variants tested; single lab\",\n      \"pmids\": [\"16737965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"After spinal cord injury, JNK3 phosphorylates Mcl-1 at Ser121 (a Pro-directed site), which displaces Pin1 from its stabilizing Thr163-Pro binding site on Mcl-1 and promotes Mcl-1 ubiquitination and degradation, thereby releasing cytochrome c and triggering oligodendrocyte apoptosis. JNK3-/- mice show reduced Mcl-1 degradation and reduced cytochrome c release, while Pin1-/- mice show the opposite.\",\n      \"method\": \"In vitro kinase assay (JNK3 phosphorylation of Mcl-1), co-immunoprecipitation (Pin1-Mcl-1), ubiquitination assay, JNK3-/- and Pin1-/- mice, cytochrome c release, oligodendrocyte apoptosis quantification\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase substrate identification, genetic KO with opposing phenotypes, multiple orthogonal biochemical endpoints; single lab but mechanistically rigorous\",\n      \"pmids\": [\"17670986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MyD88-5 (a neuronal adaptor) co-immunoprecipitates with JNK3 and recruits JNK3 from the cytosol to mitochondria in vitro; MyD88-5 co-purifies with mitochondria and co-localizes with JNK3 in neurons. MyD88-5-deficient hippocampal neurons are protected from oxygen-glucose deprivation-induced death.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation and co-purification with mitochondria, MyD88-5/GFP BAC transgenic mice, MyD88-5 knockout neurons, oxygen-glucose deprivation model\",\n      \"journal\": \"The Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, subcellular fractionation with mitochondrial co-purification, and functional KO phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"17724133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"JNK3 signaling in cerebral ischemia/reperfusion activates mitochondrial ceramide synthase via post-translational mechanisms, leading to ceramide accumulation in mitochondria that damages the respiratory chain; JNK3-deficient mice show abolished ceramide generation and respiratory chain damage following IR.\",\n      \"method\": \"Ceramide mass measurement, ceramide synthase activity assay, mitochondrial fractionation, JNK3-/- mice, cerebral ischemia/reperfusion model\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzymatic activity assay in mitochondria, genetic KO with defined biochemical endpoint; multiple methods in single study\",\n      \"pmids\": [\"17609208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Pathogenic huntingtin (polyQ-Htt) activates JNK3 (not JNK1) in neurons; activated JNK3 phosphorylates a specific residue in the kinesin-1 motor domain (identified by mass spectrometry), reducing kinesin-1 binding to microtubules and thereby inhibiting fast axonal transport.\",\n      \"method\": \"Squid axoplasm FAT assay, cellular and mouse HD models, JNK3 siRNA, mass spectrometry identification of kinesin-1 phosphorylation site, kinesin-1 microtubule binding assay\",\n      \"journal\": \"Nature Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mass spectrometry substrate identification, mechanistic FAT assay in squid axoplasm, RNAi and genetic models; multiple orthogonal approaches\",\n      \"pmids\": [\"19525941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SDF-1α activates JNK3 in endothelial cells via eNOS-dependent production of NO, which S-nitrosylates MKP7 and inactivates it, preventing MKP7 from dephosphorylating and inactivating JNK3; active JNK3 is critical for SDF-1α-induced endothelial cell migration.\",\n      \"method\": \"Co-immunoprecipitation, eNOS knockdown/inhibition, S-nitrosylation assay, MKP7 phosphatase activity assay, cell migration assay, JNK3 activity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the USA\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical assays (S-nitrosylation, phosphatase activity, kinase activity) plus functional migration endpoint; single lab\",\n      \"pmids\": [\"19307591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Arrestin-3 (β-arrestin 2) residue Val-343 is the key contributor to JNK3 activation, with Leu-278, Ser-280, His-350, Asp-351, His-352, and Ile-353 playing supporting roles. Both N- and C-terminal domains of arrestin-3 are involved, with the C-terminal domain more important. The strength of binding of ASK1 or JNK3 to arrestin does not correlate with the ability to promote JNK3 phosphorylation.\",\n      \"method\": \"Arrestin-2/3 chimeras and point mutants, co-immunoprecipitation, JNK3 phosphorylation assay in cells\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis of interaction residues with functional phosphorylation readout; single lab, two methods\",\n      \"pmids\": [\"21715332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PrPC modulates GluR6/7-PSD-95-mediated JNK3 activation; in Prnp-null mice, kainate triggers enhanced GluR6-PSD-95 interaction and JNK3 pathway activation. Double Prnp/Jnk3 knockout mice are protected from kainate neurotoxicity, placing JNK3 downstream of the PrPC-GluR6/PSD-95 signaling axis.\",\n      \"method\": \"Prnp-/- and Jnk3-/- single and double knockout mice, kainic acid model, pharmacological JNK3 inhibition, AMPA/KA receptor antagonists, co-immunoprecipitation of GluR6-PSD-95\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double KO, pharmacological inhibition, and biochemical interaction data; multiple orthogonal approaches\",\n      \"pmids\": [\"21757544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Aβ42 activates AMPK→mTOR inhibition→ER stress→JNK3 activation; activated JNK3 phosphorylates APP at T668, facilitating APP endocytosis and amyloidogenic processing, creating a feed-forward loop that perpetuates Aβ42 production. Deletion of JNK3 from FAD mice dramatically reduces Aβ42 levels and plaque load and improves cognition.\",\n      \"method\": \"JNK3-/- mice, FAD mouse model, pharmacological translation blockade, APP T668 phosphorylation immunoblot, Aβ42 ELISA, APP endocytosis assay, Morris water maze\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO in FAD model with defined substrate (APP T668), mechanistic pathway epistasis, multiple in vivo endpoints; single lab but highly comprehensive\",\n      \"pmids\": [\"22958823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"JNK2 and JNK3 are the isoforms activated in injured axons of retinal ganglion cells following axonal injury; combined deficiency of Jnk2 and Jnk3 provides robust long-term protection against axonal injury-induced RGC death and prevents JUN phosphorylation, demonstrating that JNK2/JNK3-JUN signaling is the major pathway triggering RGC death.\",\n      \"method\": \"Single and combined Jnk2/Jnk3 knockout mice, optic nerve crush axonal injury model, JUN phosphorylation immunostaining, RGC survival counting, BRN3B expression\",\n      \"journal\": \"Neurobiology of Disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with isoform-specific and double KO, multiple molecular and cellular endpoints; single lab but comprehensive\",\n      \"pmids\": [\"22353563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Arrestin-3 directly interacts with MKK7 in addition to MKK4 and JNK3α2 (using purified proteins); binding of JNK3α2 to arrestin-3 promotes arrestin-3 interaction with MKK4 while reducing its binding to MKK7. The optimal arrestin-3 concentration for scaffolding MKK7-JNK3α2 is ~10-fold higher than for MKK4-JNK3α2, revealing a concentration-dependent scaffold mechanism.\",\n      \"method\": \"In vitro binding assays with purified proteins, co-immunoprecipitation in intact cells, JNK3α2 phosphorylation assay\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified proteins plus cell-based validation; two orthogonal methods; first demonstration that bound kinase regulates scaffold-upstream kinase interactions\",\n      \"pmids\": [\"23960075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Truncated JNK3 proteins associated with intellectual disability patients, although capable of weak interaction with JNK scaffolds, cannot phosphorylate c-Jun in vitro. JNK3 interacts with PSD-95, SAP102, and SHANK3 (identified as novel partners), and JNK3 phosphorylates PSD-95 in vitro, whereas disease-associated truncated JNK3 does not. JNK3 and PSD-95 co-localize at synaptic sites in hippocampal neurons.\",\n      \"method\": \"In vitro kinase assay (c-Jun and PSD-95 substrates), co-immunoprecipitation for scaffold binding, yeast two-hybrid and immunoprecipitation for new binding partners, immunofluorescence in hippocampal neurons\",\n      \"journal\": \"Human Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assays with wild-type vs. disease mutants, new substrate/partner identification, synaptic co-localization; multiple orthogonal methods\",\n      \"pmids\": [\"23329067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"JNK3 undergoes palmitoylation in response to excitotoxic NMDA stimulation or overexpression of the palmitoyl transferase zD17, causing association with the Golgi complex independently of kinase activity. Golgi-associated JNK3 binds the phosphatase Sac1, increasing Sac1 at the Golgi and depleting PI4P, thereby inhibiting post-Golgi secretory trafficking of AMPA receptor subunit GluR1.\",\n      \"method\": \"Palmitoylation assay, JNK3 kinase-dead and palmitoylation-deficient mutants, Golgi fractionation, Sac1 co-immunoprecipitation, PI4P immunostaining, GluR1 surface trafficking assay, peptide disruption experiments in primary neurons\",\n      \"journal\": \"Science Signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple mutant constructs, lipid modification biochemistry, Golgi fractionation, PI4P quantification, and functional trafficking readout; mechanistically comprehensive\",\n      \"pmids\": [\"23838184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"EphrinB2 signaling represses JNK3 activity via STAT1; phosphotyrosine-EphrinB2 activates STAT1, which suppresses JNK3. In the absence of JNK3, hyaloid vessel physiological pruning is impaired, demonstrating that JNK3 activation causes endothelial cell death required for vessel pruning.\",\n      \"method\": \"Jnk3 knockout mice, EphrinB2 signaling constructs, STAT1 signaling assays, hyaloid vessel imaging, retinal vascular analysis\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined vascular phenotype; upstream signaling pathway delineated via epistasis; multiple methods\",\n      \"pmids\": [\"25807892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A short 25-residue peptide from arrestin-3 (the JNK3-binding element) also binds MKK4, MKK7, and ASK1 and is sufficient to enhance JNK3 activity in cells. The homologous arrestin-2 peptide (differing in four positions) binds MKK4 but not MKK7 or JNK3 and cannot enhance JNK3 activation, identifying the minimal scaffold element.\",\n      \"method\": \"Binding assays with purified proteins and peptides, JNK3 phosphorylation assay in cells, comparison of arrestin-2 vs. arrestin-3 peptides\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical binding assays and functional cell assay; single lab; minimal scaffold identification\",\n      \"pmids\": [\"26868142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KLF9 transcription factor suppresses axon growth through direct interaction with MAPK10/JNK3; JNK3 is required for KLF9's axon-growth-suppressive activity. Mutation of two JNK3-phosphorylation acceptor sites on KLF9 (Ser106 and Ser110), or disruption of the JNK3-binding domain of KLF9, abolishes neurite growth suppression in vitro and promotes axon regeneration in vivo.\",\n      \"method\": \"Co-immunoprecipitation (KLF9-JNK3 interaction), site-directed mutagenesis (Ser106/Ser110), shRNA knockdown, neurite outgrowth assay, optic nerve crush regeneration in rats\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding, substrate phosphorylation sites identified, mutagenesis, in vitro and in vivo functional endpoints; multiple orthogonal methods\",\n      \"pmids\": [\"28871032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Arrestin-3 shows >15-fold higher affinity for inactive JNK3 than for active (phosphorylated) JNK3, with a shift in binding site upon JNK3 activation. Catalytic phosphorylation of JNK3 at Thr-221 by MKK7 is ~100-fold faster than phosphorylation of Tyr-223 by MKK4 (with or without arrestin-3). Release of activated JNK3 from the scaffold is essential for signal amplification, suggesting a 'conveyor belt' mechanism.\",\n      \"method\": \"Binding affinity measurements (phosphorylated vs. unphosphorylated JNK3), systems biochemistry modeling with Bayesian inference, in vitro phosphorylation kinetics\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the USA\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative binding measurements, kinetic characterization of phosphorylation rates, computational modeling; multiple orthogonal approaches; mechanistically definitive\",\n      \"pmids\": [\"30591558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The β1 strand of arrestin-3 is the major interaction site with JNK3; C-lobe regions near the activation loop of JNK3 form the JNK3 interface with arrestin-3, and this interface is variable depending on ATP-binding status. C-terminal truncation of arrestin-3 (pre-activation) facilitates the arrestin-3/JNK3 interaction by exposing the buried β1 strand.\",\n      \"method\": \"Hydrogen/deuterium exchange mass spectrometry, 19F-NMR, tryptophan-induced Atto 655 fluorescence quenching, C-terminal truncation mutants\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — three orthogonal structural/biophysical methods (HDX-MS, NMR, fluorescence quenching) identifying interaction interfaces; single lab\",\n      \"pmids\": [\"31080119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DLK (MAP3K) and JNK3 are coupled by palmitoylation: JNK3 catalyzes positive feedback phosphorylation of DLK that further activates DLK, locking the DLK-JNK3 module in a highly active state. Both DLK and JNK3 are endogenously palmitoylated, which targets them to the same axonal vesicles. JNK3 palmitoylation is essential for axonal retrograde prodegenerative signaling after optic nerve crush in vivo; JNK2 and JNK3 (but not JNK1) promote prodegenerative axon-to-soma signaling.\",\n      \"method\": \"Palmitoylation assays (acyl-RAC), in vitro DLK phosphorylation by JNK3, optic nerve crush in vivo, JNK isoform knockdown/KO, axonal retrograde signaling assays, vesicle co-localization\",\n      \"journal\": \"Science Signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay, palmitoylation biochemistry, genetic isoform dissection, in vivo optic nerve model; multiple orthogonal methods\",\n      \"pmids\": [\"35349303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DLK (Map3k12) associates with and activates JNK3 in pancreatic beta cells; Dlk overexpression increases JNK3 activity, and this DLK-JNK3 cascade stimulates expression of cyclins Ccnd1 and Ccnd2, which are required for postnatal beta-cell replication. Silencing of Dlk or Jnk3 in neonatal islet cells markedly reduces beta-cell replication and cyclin expression.\",\n      \"method\": \"Co-immunoprecipitation (DLK-JNK3 interaction), JNK3 kinase activity assay, Dlk/Jnk3 siRNA knockdown in neonatal islet cells, cyclin expression by RT-PCR/immunoblot, beta-cell replication quantification\",\n      \"journal\": \"Cellular and Molecular Life Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct Co-IP, kinase activity assay, loss-of-function with defined downstream targets (cyclin D1/D2); multiple orthogonal methods in same study\",\n      \"pmids\": [\"32189007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"JNK3 is protected from dephosphorylation/inactivation by MKP7 when MKP7 is associated with the beta-arrestin 2 scaffold; angiotensin II receptor stimulation causes rapid (within 5 min) dissociation of MKP7 from beta-arrestin 2, permitting JNK3 activation, followed by reassociation of MKP7 with beta-arrestin 2 on endocytic vesicles at 30-60 min.\",\n      \"method\": \"Co-immunoprecipitation (MKP7–beta-arrestin 2 interaction), JNK3 dephosphorylation assay, AT1aR stimulation time course, endosome localization assay\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical interaction and phosphatase activity assays with receptor stimulation time course; single lab\",\n      \"pmids\": [\"15888437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In insulin-secreting cells, JNK3 (but not JNK1 or JNK2) knockdown decreases IRS2 protein expression and blocks Akt2 (but not Akt1) activation by insulin, via reduced FoxO3A activity (FoxO3A controls IRS2 expression). JNK3 silencing in these cells increases c-Jun levels. JNK3 thus maintains IRS2–Akt2 pro-survival signaling in beta cells.\",\n      \"method\": \"JNK3/JNK1/JNK2 isoform-specific siRNA in INS-1E cells, IRS2/Akt2 immunoblotting, FoxO3A activity assay, c-Jun quantification\",\n      \"journal\": \"PloS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific knockdown with defined molecular pathway endpoints; single lab\",\n      \"pmids\": [\"22563476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Combined deficiency of Jnk2 and Jnk3 (but not either alone) completely abrogates apoptosis of dopamine neurons in the substantia nigra in a 6-hydroxydopamine model, with full protection of the cell soma but no protection of axons, demonstrating that JNK2/JNK3 together specifically mediate apoptotic somal death via distinct mechanisms from axon degeneration.\",\n      \"method\": \"Single and double Jnk2/Jnk3 knockout mice, intrastriatal 6-OHDA model, dopamine neuron counting, axon degeneration assessment\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous genetic epistasis with double KO, clear dissection of soma vs. axon degeneration pathways\",\n      \"pmids\": [\"19014392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A novel zebrafish mapk10 (ortholog of MAPK10/JNK3) loss-of-function mutation reduces enteric neuron numbers, and introduction of mapk10 mutations into ret heterozygous zebrafish enhances the enteric nervous system deficit, supporting MAPK10 as a Hirschsprung disease susceptibility/modifier locus.\",\n      \"method\": \"Zebrafish mapk10 loss-of-function mutants, genetic epistasis with ret heterozygotes, live imaging of ENS progenitor migration, neuron counting\",\n      \"journal\": \"PLoS Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in zebrafish model organism; loss-of-function with defined cellular phenotype (ENS neuron number) and modifier interaction\",\n      \"pmids\": [\"27902697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AICD (APP intracellular domain) interacts with the JNK3 gene locus and upregulates JNK3 expression after optic nerve axotomy (demonstrated by ChIP and luciferase reporter assay); JNK3 upregulation contributes to retinal ganglion cell death. APP knockout reduces ONA-induced JNK3 and pJNK expression, and gamma-secretase inhibitors similarly reduce JNK3 expression and protect RGCs.\",\n      \"method\": \"Microarray/pathway analysis, chromatin immunoprecipitation (AICD at JNK3 locus), luciferase reporter assay, APP KO mice, gamma-secretase inhibitor treatment, JNK3 immunoblot, RGC survival counting\",\n      \"journal\": \"Cell Death and Differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay for transcriptional regulation, genetic KO with molecular and cellular endpoints; multiple orthogonal methods\",\n      \"pmids\": [\"29238071\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MAPK10/JNK3 is a neuronally enriched serine/threonine MAP kinase that is activated by dual phosphorylation (Thr-221 primarily by MKK7, Tyr-223 by MKK4) and is scaffolded by beta-arrestin 2/arrestin-3 (via the ASK1–MKK4/7–JNK3 module) to phosphorylate substrates including c-Jun, ATF-2, p53 (Ser34), APP (Thr668), kinesin-1, Mcl-1 (Ser121), SCG10 (Ser62/73), PSD-95, and KLF9 (Ser106/110); it mediates excitotoxic, ischemic, and stress-induced neuronal apoptosis (via c-Jun/AP-1, Bim/Fas, cytochrome c release, and ceramide synthase activation), inhibits secretory trafficking at the Golgi via palmitoylation-dependent Sac1 binding and PI4P depletion, drives prodegenerative axon-to-soma signaling through a positive feedback loop with DLK kinase (also requiring palmitoylation), suppresses axon regeneration by phosphorylating KLF9, and in non-neuronal contexts (pancreatic beta cells) promotes postnatal cell proliferation via a DLK–JNK3–cyclin D1/D2 axis and protects beta cells from cytokine-induced apoptosis through IRS2–Akt2 signaling maintenance.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MAPK10/JNK3 is a neuronally enriched stress-activated MAP kinase that serves as a central effector of neuronal apoptosis and degeneration, acting upstream of c-Jun/AP-1 transcriptional activation in excitotoxic and trophic-deprivation death pathways [#0, #7]. It is fully activated by dual phosphorylation: MKK7 catalyzes the rate-limiting Thr-221 monophosphorylation (~100-fold faster than MKK4-mediated Tyr-223 phosphorylation) sufficient for measurable activity, while bisphosphorylation by MKK4 plus MKK7 maximizes catalysis [#4, #30], a configuration rationalized by structures showing the unphosphorylated enzyme adopts an open, catalytically misaligned conformation [#1]. Arrestin-3/beta-arrestin 2 scaffolds the ASK1–MKK4/7–JNK3 module through a defined C-terminal element, preferentially binding inactive JNK3 and releasing it upon activation in a 'conveyor belt' amplification mechanism that drives receptor-coupled signaling and cytosolic retention [#3, #20, #24, #30]. JNK3 phosphorylates a broad neuronal substrate set—c-Jun and ATF-2 [#8], p53 at Ser34 [#12], APP at Thr668 [#13], SCG10 at Ser62/73 [#6], kinesin-1 [#18], Mcl-1 at Ser121 [#15], PSD-95 [#25], and KLF9 at Ser106/110 [#29]—coupling it to apoptosis (Bim/Fas induction and cytochrome c release [#10], mitochondrial ceramide synthase activation [#17]), impaired axonal transport [#18], synaptic signaling [#25], and suppression of axon regeneration [#29]. Through a feed-forward loop, JNK3 phosphorylation of APP-T668 promotes amyloidogenic processing in Alzheimer models [#22], while AICD transcriptionally upregulates the JNK3 locus after axonal injury [#38]. Beyond canonical kinase signaling, palmitoylation directs JNK3 to the Golgi where it binds the phosphatase Sac1 to deplete PI4P and inhibit secretory trafficking [#26], and couples it to DLK on axonal vesicles in a positive-feedback module driving retrograde prodegenerative signaling [#32]. In non-neuronal contexts JNK3 acts through a DLK–JNK3–cyclin D axis to promote postnatal beta-cell replication and maintains IRS2–Akt2 pro-survival signaling [#33, #35]. A zebrafish loss-of-function study links mapk10 to enteric nervous system development as a Hirschsprung disease modifier [#37], and truncated JNK3 variants that cannot phosphorylate c-Jun or PSD-95 are associated with intellectual disability [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established JNK3 as a nervous-system-restricted MAP kinase capable of dual Thr/Tyr autophosphorylation, defining it as a distinct neuronal stress kinase.\",\n      \"evidence\": \"in vitro autophosphorylation, cDNA characterization, and tissue expression by Northern/immunochemistry\",\n      \"pmids\": [\"7826642\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No upstream activators or physiological substrates identified\", \"Function in vivo not addressed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstrated that JNK3 is genetically required for excitotoxic neuronal apoptosis, placing it upstream of c-Jun/AP-1 in the death pathway and establishing its disease relevance.\",\n      \"evidence\": \"Jnk3 germline knockout mice in a kainic acid excitotoxicity model with c-Jun phosphorylation and AP-1 reporter readouts\",\n      \"pmids\": [\"9349820\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct substrate phosphorylation by JNK3 not shown biochemically\", \"Mechanism of JNK3 activation not addressed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Showed JNK3 can phosphorylate p53 at Ser34 and associate with it, expanding the candidate substrate repertoire toward apoptotic regulators.\",\n      \"evidence\": \"in vitro kinase assay, dominant-negative mutant, and Co-IP in 293T cells\",\n      \"pmids\": [\"9393873\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Finding shared across JNK1/2/3, not JNK3-specific\", \"In vivo relevance of p53-Ser34 phosphorylation by JNK3 untested\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Provided the structural basis for JNK3's low basal activity and ATP-binding architecture, explaining why dual phosphorylation is required for activation.\",\n      \"evidence\": \"X-ray crystallography of unphosphorylated JNK3 with an ATP analog\",\n      \"pmids\": [\"9739089\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of the activated/bisphosphorylated enzyme\", \"Substrate-bound conformation not resolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined the dual-kinase activation logic, showing MKK7 monophosphorylation of Thr is sufficient for activity while MKK4+MKK7 bisphosphorylation maximizes catalysis.\",\n      \"evidence\": \"in vitro reconstitution with purified MKK4/MKK7/JNK3, mass spectrometry site mapping, and steady-state kinetics\",\n      \"pmids\": [\"10715136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular regulation of MKK4 vs MKK7 input not addressed\", \"Role of scaffolds in vivo not established here\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified beta-arrestin 2 as a direct JNK3 scaffold linking GPCR signaling to the ASK1–MKK4–JNK3 module and controlling JNK3 subcellular localization.\",\n      \"evidence\": \"yeast two-hybrid, reciprocal Co-IP from brain and COS-7 cells, confocal co-localization, and kinase assays with AT1A receptor stimulation\",\n      \"pmids\": [\"11090355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Scaffold-binding residues not yet mapped\", \"Quantitative effect on activation kinetics unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Mapped the arrestin-3 RRSLHL docking motif and showed it enhances the specific MKK4→JNK3 phosphorylation step, defining the scaffold mechanism at residue resolution.\",\n      \"evidence\": \"arrestin chimeras, site-directed mutagenesis, Co-IP, and JNK3 phosphorylation assays\",\n      \"pmids\": [\"11356842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MKK7 contribution to the scaffold not addressed here\", \"In vivo requirement of the motif untested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified SCG10 as a direct neuronal substrate phosphorylated at Ser62/73, linking JNK3 to microtubule dynamics during trophic deprivation.\",\n      \"evidence\": \"in vitro kinase assay with site mapping, microtubule destabilization assay, Co-IP, and NGF-deprivation neuron model\",\n      \"pmids\": [\"11718727\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence for axon morphology in vivo not shown\", \"JNK3 isoform specificity for SCG10 not tested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Placed JNK3 specifically in the c-Jun activation branch of NGF-deprivation apoptosis, distinct from ROS generation.\",\n      \"evidence\": \"sympathetic neurons from Jnk3 KO mice with c-Jun phosphorylation, c-jun mRNA, oxidative stress, and apoptosis readouts\",\n      \"pmids\": [\"11461965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct JNK3-c-Jun phosphorylation in these neurons not isolated from other JNKs\", \"Mechanism upstream of JNK3 activation unaddressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed context-dependent substrate choice (ATF-2 in death vs c-Jun in differentiation), indicating JNK3 outputs depend on stimulus.\",\n      \"evidence\": \"JNK3 gain-of-function in JNK3-null PC12 cells with substrate phosphorylation and neurite outgrowth readouts\",\n      \"pmids\": [\"12401814\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis for substrate selectivity not defined\", \"Single overexpression system\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Implicated JNK3 in pathological tau phosphorylation and aggregation, connecting it to neurodegenerative proteinopathy.\",\n      \"evidence\": \"adenoviral co-expression of tau, MEKK, JNK3, GSK-3beta in COS-7 with phospho-epitope immunoblot, Thioflavin-S, and solubility assays\",\n      \"pmids\": [\"12191990\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"JNK3-specific contribution vs co-expressed kinases not isolated\", \"No neuronal or in vivo validation\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined the mitochondrial apoptotic effector arm of JNK3 in ischemia, via Bim/Fas induction and cytochrome c release.\",\n      \"evidence\": \"Jnk3 KO mice in cerebral ischemia-hypoxia model with JNK activity, Bim/Fas, and cytochrome c readouts\",\n      \"pmids\": [\"14657393\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct JNK3 substrates linking to Bim/Fas not identified\", \"Transcriptional vs post-translational control unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Provided atomic-level basis for selective ATP-competitive JNK3 inhibition over related MAP kinases.\",\n      \"evidence\": \"X-ray crystallography of four JNK3-inhibitor complexes\",\n      \"pmids\": [\"12954329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No allosteric or substrate-site inhibition explored\", \"Cellular efficacy not assessed in this work\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified APP-Thr668 as a JNK3-isoform-specific substrate that physiologically limits APP/AICD nuclear signaling.\",\n      \"evidence\": \"primary neurons with isoform-selective siRNA/KO, APP-T668 immunoblot, AICD-Fe65 Co-IP, and nuclear localization assays\",\n      \"pmids\": [\"15944381\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo consequence for APP processing not addressed here\", \"Upstream activator of JNK3 in differentiation unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Revealed dynamic scaffold-coupled phosphatase control, with MKP7 dissociation from beta-arrestin 2 enabling transient JNK3 activation after receptor stimulation.\",\n      \"evidence\": \"Co-IP of MKP7–beta-arrestin 2, JNK3 dephosphorylation assays, and AT1aR stimulation time course\",\n      \"pmids\": [\"15888437\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signal triggering MKP7 dissociation not defined\", \"Single-lab biochemistry without in vivo confirmation\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed that basal (receptor-unbound) arrestins pre-load JNK3 and exclude it from the nucleus, implying scaffold engagement precedes receptor activation.\",\n      \"evidence\": \"GFP-JNK3 nuclear exclusion assay in HEK293 with arrestin conformation mutants\",\n      \"pmids\": [\"16737965\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of nuclear exclusion to JNK3 signaling unclear\", \"Overexpression-based localization readout\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the MyD88-5 adaptor as the route targeting JNK3 to mitochondria in ischemic death.\",\n      \"evidence\": \"reciprocal Co-IP, mitochondrial co-purification, MyD88-5 KO neurons, and oxygen-glucose deprivation model\",\n      \"pmids\": [\"17724133\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"JNK3 mitochondrial substrates not identified\", \"Relationship to arrestin scaffolding unaddressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified Mcl-1 Ser121 as a JNK3 substrate whose phosphorylation displaces Pin1 to promote Mcl-1 degradation and oligodendrocyte apoptosis after spinal cord injury.\",\n      \"evidence\": \"in vitro kinase assay, Pin1-Mcl-1 Co-IP, ubiquitination assay, and JNK3-/- vs Pin1-/- mice with cytochrome c readouts\",\n      \"pmids\": [\"17670986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct in vivo demonstration of Mcl-1 Ser121 phosphorylation by JNK3 limited\", \"Generality across cell types untested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linked JNK3 to mitochondrial ceramide synthase activation as a lipid-based mechanism of respiratory chain damage in ischemia/reperfusion.\",\n      \"evidence\": \"ceramide mass and synthase activity assays, mitochondrial fractionation, and JNK3-/- mice in IR model\",\n      \"pmids\": [\"17609208\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of JNK3 controlling ceramide synthase unknown\", \"Post-translational mechanism not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established a polyQ-huntingtin–JNK3–kinesin-1 axis that impairs fast axonal transport, mechanistically connecting JNK3 to Huntington disease.\",\n      \"evidence\": \"squid axoplasm FAT assay, HD models, JNK3 siRNA, MS substrate site identification, and kinesin-microtubule binding assay\",\n      \"pmids\": [\"19525941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinesin-1 phospho-site consequence in mammalian neurons in vivo not shown\", \"Activation route of JNK3 by polyQ-Htt undefined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Uncovered a non-neuronal endothelial role: SDF-1alpha activates JNK3 via NO-dependent S-nitrosylation/inactivation of MKP7, driving cell migration.\",\n      \"evidence\": \"Co-IP, eNOS knockdown, S-nitrosylation and phosphatase assays, and migration assays\",\n      \"pmids\": [\"19307591\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"JNK3 substrates driving migration not identified\", \"In vivo endothelial relevance not tested here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mapped arrestin-3 residues (notably Val-343) required for JNK3 activation, showing scaffold catalysis is uncoupled from binding strength.\",\n      \"evidence\": \"arrestin chimeras/point mutants, Co-IP, and JNK3 phosphorylation assays\",\n      \"pmids\": [\"21715332\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of catalysis-vs-binding decoupling unresolved\", \"In vivo significance of these residues untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed JNK3 downstream of a PrPC–GluR6/7–PSD-95 signaling axis in excitotoxicity using genetic epistasis.\",\n      \"evidence\": \"Prnp/Jnk3 single and double KO mice, kainate model, pharmacological inhibition, and GluR6-PSD-95 Co-IP\",\n      \"pmids\": [\"21757544\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical link from PSD-95 complex to JNK3 activation not defined\", \"Receptor-proximal activation step unmapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined a feed-forward Abeta42→JNK3→APP-T668 loop perpetuating amyloidogenesis, with JNK3 deletion reducing plaque load and improving cognition.\",\n      \"evidence\": \"JNK3-/- in FAD mice, translation blockade, APP-T668 immunoblot, Abeta42 ELISA, endocytosis assay, and behavioral testing\",\n      \"pmids\": [\"22958823\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct in vivo demonstration of JNK3 catalysis on APP-T668 within the loop limited\", \"Contribution of other JNKs not fully excluded\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed a JNK3-specific pro-survival role in beta cells via maintenance of IRS2–Akt2 signaling through FoxO3A.\",\n      \"evidence\": \"isoform-specific siRNA in INS-1E cells with IRS2/Akt2 immunoblot, FoxO3A activity, and c-Jun readouts\",\n      \"pmids\": [\"22563476\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo beta-cell survival role untested\", \"Direct JNK3 substrates in this pathway not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established JNK2/JNK3-JUN as the major axonal-injury death pathway in retinal ganglion cells via genetic epistasis.\",\n      \"evidence\": \"single and combined Jnk2/Jnk3 KO mice, optic nerve crush, JUN phosphorylation, and RGC survival counting\",\n      \"pmids\": [\"22353563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Distinct contributions of JNK2 vs JNK3 not resolved\", \"Direct JUN phosphorylation by JNK3 not isolated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovered a palmitoylation-driven, kinase-activity-independent Golgi function whereby JNK3 binds Sac1 to deplete PI4P and inhibit secretory trafficking of GluR1.\",\n      \"evidence\": \"palmitoylation assays, kinase-dead and palmitoylation-deficient mutants, Golgi fractionation, Sac1 Co-IP, PI4P imaging, and GluR1 trafficking assays\",\n      \"pmids\": [\"23838184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo significance of Golgi trafficking inhibition not established\", \"Identity of the JNK3 palmitoyltransferase in vivo unconfirmed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked truncating JNK3 variants to intellectual disability and identified PSD-95/SAP102/SHANK3 as synaptic partners plus PSD-95 as a substrate.\",\n      \"evidence\": \"in vitro kinase assays (c-Jun, PSD-95) comparing wild-type vs disease mutants, Co-IP, Y2H, and synaptic immunofluorescence\",\n      \"pmids\": [\"23329067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causality of variants via family/rescue not fully established\", \"Functional consequence of PSD-95 phosphorylation in vivo untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed arrestin-3 directly binds MKK7 in addition to MKK4 and JNK3, with concentration-dependent and ligand-state-dependent scaffold assembly.\",\n      \"evidence\": \"in vitro binding with purified proteins, cell Co-IP, and JNK3 phosphorylation assays\",\n      \"pmids\": [\"23960075\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of concentration-dependent scaffolding unknown\", \"ASK1 incorporation kinetics not addressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined a physiological developmental role: EphrinB2-STAT1 represses JNK3 to control endothelial death during hyaloid vessel pruning.\",\n      \"evidence\": \"Jnk3 KO mice, EphrinB2/STAT1 signaling constructs, and vascular imaging\",\n      \"pmids\": [\"25807892\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct JNK3 substrates in endothelial apoptosis not identified\", \"Molecular link from STAT1 to JNK3 repression unmapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified a minimal 25-residue arrestin-3 element sufficient to bind MKK4/7 and ASK1 and enhance JNK3 activation, distinguishing it from arrestin-2.\",\n      \"evidence\": \"peptide binding assays with purified proteins and cellular JNK3 phosphorylation assays\",\n      \"pmids\": [\"26868142\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural mechanism of peptide-mediated catalysis unresolved\", \"Single-lab validation\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked mapk10 to enteric nervous system development as a Hirschsprung disease modifier through interaction with ret.\",\n      \"evidence\": \"zebrafish mapk10 loss-of-function mutants with ret epistasis and ENS neuron imaging/counting\",\n      \"pmids\": [\"27902697\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mammalian/human ENS role not confirmed\", \"Molecular pathway connecting MAPK10 to RET undefined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined JNK3 as a required effector of KLF9-mediated axon-growth suppression via phosphorylation at Ser106/110, with site mutation promoting regeneration.\",\n      \"evidence\": \"KLF9-JNK3 Co-IP, Ser106/110 mutagenesis, shRNA, neurite assays, and optic nerve crush regeneration in rats\",\n      \"pmids\": [\"28871032\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which phospho-KLF9 suppresses transcription not detailed\", \"Upstream JNK3 activation in this context unmapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established transcriptional autoregulation: AICD binds the JNK3 locus to upregulate its expression after axotomy, contributing to RGC death.\",\n      \"evidence\": \"ChIP at JNK3 locus, luciferase reporter, APP KO mice, gamma-secretase inhibitors, and RGC survival assays\",\n      \"pmids\": [\"29238071\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcription-factor partners of AICD at the locus unresolved\", \"Generalizability beyond optic nerve injury untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Quantified the activation/release logic of the arrestin-3 scaffold, showing preferential binding of inactive JNK3, faster Thr-221 than Tyr-223 phosphorylation, and a 'conveyor belt' amplification requiring product release.\",\n      \"evidence\": \"binding affinity measurements, in vitro phosphorylation kinetics, and Bayesian systems-biochemistry modeling\",\n      \"pmids\": [\"30591558\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo validation of the conveyor-belt model lacking\", \"Regulation of release rate by physiological cues unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapped the arrestin-3/JNK3 interface at structural resolution, identifying the arrestin-3 beta1 strand and ATP-status-dependent JNK3 C-lobe contacts.\",\n      \"evidence\": \"HDX-MS, 19F-NMR, fluorescence quenching, and C-terminal truncation mutants\",\n      \"pmids\": [\"31080119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full co-complex crystal/cryo-EM structure\", \"Single-lab biophysical characterization\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a non-neuronal proliferative role via a DLK–JNK3–cyclin D1/D2 axis required for postnatal beta-cell replication.\",\n      \"evidence\": \"DLK-JNK3 Co-IP, kinase activity assays, Dlk/Jnk3 siRNA in neonatal islets, cyclin expression, and replication quantification\",\n      \"pmids\": [\"32189007\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct JNK3 substrate driving cyclin induction not identified\", \"In vivo genetic confirmation in beta cells limited\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed a palmitoylation-dependent DLK-JNK3 positive-feedback module on axonal vesicles that drives retrograde prodegenerative signaling after injury.\",\n      \"evidence\": \"acyl-RAC palmitoylation assays, in vitro DLK phosphorylation by JNK3, isoform KO/knockdown, vesicle co-localization, and in vivo optic nerve crush\",\n      \"pmids\": [\"35349303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DLK phospho-site phosphorylated by JNK3 not mapped\", \"Palmitoyltransferase responsible in vivo unconfirmed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How JNK3's distinct subcellular pools (arrestin-cytosolic, mitochondrial, Golgi, axonal-vesicular) are coordinated to select among its many substrates and dictate apoptotic versus trafficking versus proliferative outputs remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model coupling localization to substrate choice\", \"Substrates linking JNK3 to mitochondrial ceramide synthase and Bim/Fas induction unidentified\", \"Human disease causality (intellectual disability, Hirschsprung) rests on partial genetic evidence\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 6, 13, 15, 18, 29]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [4, 6, 8, 15, 29]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 14]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [16, 17]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [26]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [3, 32]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 10, 15, 36]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4, 30]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [18, 22, 25, 37]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 8]}\n    ],\n    \"complexes\": [\n      \"ASK1–MKK4/7–JNK3 arrestin-3 scaffold module\",\n      \"DLK–JNK3 module\"\n    ],\n    \"partners\": [\n      \"ARRB2\",\n      \"MAP2K7\",\n      \"MAP2K4\",\n      \"MAP3K12\",\n      \"DLG4\",\n      \"SCG10\",\n      \"KLF9\",\n      \"MYD88\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}