{"gene":"MAPK8IP3","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1999,"finding":"JIP3/JSAP1 (mouse) was identified as a scaffold protein that directly binds JNK3 (and JNK1/JNK2), SEK1 MAPKK, and MEKK1 MAPKKK via distinct regions, assembles them into a signaling complex, and facilitates JNK3 activation in cultured COS-7 cells; deletion of the JNK- or MEKK1-binding regions reduced JNK3 activation.","method":"Yeast two-hybrid screen, co-immunoprecipitation in COS-7 cells, in vitro binding assay, deletion mutant analysis, kinase activation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro binding plus cell-based co-IP plus mutagenesis, independently replicated across multiple subsequent studies","pmids":["10523642"],"is_preprint":false},{"year":2000,"finding":"JIP3 (mouse SYD/JSAP1) was shown to bind kinesin-I via the tetratricopeptide repeat (TPR) domain of kinesin light chain (KLC) with Kd ~200 nM, and GFP-tagged mammalian SYD localizes to tubulovesicular structures that co-stain for kinesin-I and a secretory pathway marker; co-immunoprecipitation confirmed the complex forms in vivo in mouse brain.","method":"Yeast two-hybrid, in vitro binding/affinity measurement, co-immunoprecipitation, GFP live-cell imaging","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Kd measured in vitro, co-IP in vivo, subcellular localization, replicated by multiple subsequent studies","pmids":["11106729"],"is_preprint":false},{"year":2000,"finding":"JIP3 is expressed predominantly in the brain (lower levels in heart) and accumulates in growth cones of developing neurites, establishing its neuronal subcellular localization.","method":"Immunofluorescence, Northern/Western blot","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 3 / Strong — localization established by immunofluorescence in multiple papers but without direct functional consequence shown in this paper alone","pmids":["10629060"],"is_preprint":false},{"year":2002,"finding":"ASK1 phosphorylates JIP3/JSAP1 in vitro and in vivo; this phosphorylation enhances interactions of JSAP1 with SEK1/MKK4, MKK7, and JNK3, and is required for JSAP1 to recruit and activate JNK in response to H2O2, establishing a phosphorylation-dependent scaffolding mechanism.","method":"In vitro kinase assay, co-immunoprecipitation, H2O2 stimulation assay, mutational analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro phosphorylation assay plus in vivo co-IP plus functional rescue, single lab with multiple orthogonal methods","pmids":["12189133"],"is_preprint":false},{"year":2000,"finding":"Alternative splicing of the JSAP1 gene generates four isoforms (JSAP1a–d); the JNK-binding domain maps to aa 201–217 (exon 6); isoforms JSAP1c and JSAP1d, which contain an extra 31-aa sequence, show lower binding affinity for JNKs (especially JNK3), suggesting they may attenuate scaffolding activity.","method":"cDNA cloning, exon-intron mapping, co-immunoprecipitation binding assay","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — domain mapping by co-IP and deletion analysis, single lab","pmids":["11024282"],"is_preprint":false},{"year":2003,"finding":"Germline Jip3 knockout mice die at birth and display severe defects in telencephalic commissure (corpus callosum) morphogenesis; the phenotype is partly attributable to reduced RhoA/ROCK signaling, placing JIP3 upstream of RhoA-ROCK in brain commissure development.","method":"Targeted gene disruption (knockout mice), histological analysis, signaling pathway assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined morphological and signaling phenotype, replicated by independent lab (PMID 15572149)","pmids":["12897243"],"is_preprint":false},{"year":2005,"finding":"JSAP1/JIP3 forms a complex with focal adhesion kinase (FAK) and mediates FAK/p130Cas-dependent JNK activation in response to fibronectin; JSAP1 co-localizes with JNK and phospho-FAK at the leading edge and stimulates cell migration in a JNK-binding-domain-dependent manner.","method":"Co-immunoprecipitation, co-expression/transfection, immunofluorescence co-localization, migration assay, dominant-negative constructs","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal co-IP, functional rescue, localization, single lab","pmids":["16141199"],"is_preprint":false},{"year":2005,"finding":"Transgenic expression of JIP1 partially rescued the corpus callosum and anterior commissure axon guidance defects of jsap1-/- mice, and JIP3-null brains showed reduced phospho-FAK and phospho-JNK distribution, linking JIP3 to FAK and JNK signaling in commissure axon guidance in vivo.","method":"Transgenic rescue in knockout mice, Western blot/immunohistochemistry","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic rescue experiment, single lab, limited mechanistic depth","pmids":["15572149"],"is_preprint":false},{"year":2008,"finding":"ROCK1 was identified as an upstream activator of JIP3; upon UVB stress in keratinocytes, ROCK1 binds JIP3 and phosphorylates it, which is required for JNK recruitment to JIP3 and subsequent JNK activation and apoptosis.","method":"Tandem affinity purification, co-IP, phosphorylation assay, ROCK1 inhibition, ROCK1+/- mice","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — TAP identification, kinase assay, in vivo mouse validation, multiple orthogonal methods","pmids":["19036714"],"is_preprint":false},{"year":2010,"finding":"JIP3 restriction of axon branching in cerebellar granule neurons is mediated by GSK3β: JIP3 knockdown reduces GSK3β levels, and GSK3β knockdown phenocopies JIP3 knockdown; GSK3β phosphorylates doublecortin (DCX) at Ser327 to restrict axon branching downstream of JIP3.","method":"shRNA knockdown, in utero electroporation, kinase assay (GSK3β phosphorylation of DCX), cerebellar slice and in vivo rat models","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — epistasis by double knockdown, in vitro kinase assay, in vivo electroporation, multiple orthogonal methods","pmids":["21159948"],"is_preprint":false},{"year":2010,"finding":"ARF6 GTP-bound form interacts with JIP3 (via the LZII region), and JIP3 acts as a downstream effector of ARF6 to regulate neurite morphogenesis in cortical neurons; overexpression of an ARF6 dominant-negative mutant unable to bind JIP3, or JIP3 knockdown, both stimulate neurite elongation and branching.","method":"Pull-down/co-IP, dominant-negative ARF6 mutant, JIP3 knockdown, neurite morphology assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — protein interaction plus functional knockdown, single lab","pmids":["20493856"],"is_preprint":false},{"year":2011,"finding":"Sunday Driver (JIP3/syd) interacts directly with kinesin heavy chain (KHC) via a domain independent of KLC; syd activates KHC for transport in an in vitro motility assay, increasing both KHC velocity and run length; syd mutants that bind KHC but not KLC are still transported to axons and dendrites.","method":"In vitro binding/pull-down, in vitro single-molecule motility assay, neuronal transport assay with separation-of-function mutants","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution motility assay with mutagenesis, neuronal validation; replicated by PMID 25944905","pmids":["21750526"],"is_preprint":false},{"year":2011,"finding":"C. elegans UNC-16/JIP3 binds dynein light intermediate (DLI) chain and links kinesin-1 to dynein; both kinesin-1 and UNC-16 are required for localization of DLI-1 at microtubule plus-ends; retrograde transport of APL-1 depends on kinesin-1, UNC-16, and dynein, demonstrating that kinesin-1/UNC-16 mediates anterograde transport of dynein for subsequent retrograde cargo transport.","method":"Co-IP, genetic loss-of-function, live imaging in C. elegans","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP plus genetic epistasis plus in vivo imaging, replicated by multiple JIP3-dynein interaction studies","pmids":["21307258"],"is_preprint":false},{"year":2011,"finding":"JIP3 binds directly to TrkB via a 12 aa juxtamembrane domain and links TrkB to kinesin-1, selectively driving TrkB anterograde transport in axons (but not dendrites) of hippocampal neurons; JIP3-mediated TrkB axonal transport enhances BDNF-induced Erk activation and axonal filopodia formation.","method":"Co-IP, deletion mutant binding assay, live axonal transport imaging, BDNF signaling assay","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct binding domain mapped, transport imaging, functional signaling readout, single lab with multiple orthogonal methods","pmids":["21775604"],"is_preprint":false},{"year":2013,"finding":"C. elegans UNC-16/JIP3 acts as an organelle gatekeeper at the axon initial segment (AIS): loss of UNC-16 causes up to 10-fold accumulation of Golgi, endosomes, and lysosomes (but not ER) in axons; UNC-16 is concentrated at the AIS and inhibits organelle escape past the AIS rather than promoting anterograde transport.","method":"Electron microscopy, quantitative live imaging of tagged organelles, time-lapse microscopy in C. elegans","journal":"Genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — EM plus quantitative live imaging plus regional analysis, single lab with multiple orthogonal methods; functionally places JIP3 at AIS as gatekeeper","pmids":["23633144"],"is_preprint":false},{"year":2013,"finding":"JIP3 promotes axon elongation in hippocampal neurons via kinesin-dependent transport to axon tips and JNK-dependent modulation of cofilin and actin dynamics; deletion mutants lacking the kinesin-binding or JNK-binding domain abolish the elongation effect.","method":"Gain/loss-of-function, deletion mutants, in utero electroporation, immunofluorescence of cofilin phosphorylation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple deletion mutants and in vivo electroporation, single lab","pmids":["23576431"],"is_preprint":false},{"year":2014,"finding":"Drosophila Syd/JIP3 specifically regulates kinesin- and dynein-dependent cortical pulling of myonuclei without affecting motor activity near the nucleus; Syd mediates kinesin-dependent localization of dynein to muscle ends, and JNK signaling acts upstream of Syd to promote this cortical dynein localization.","method":"Drosophila genetics (loss-of-function), live imaging, epistasis analysis, rescue with mammalian JIP3","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis, rescue with mammalian JIP3 confirming conservation, single lab","pmids":["25522254"],"is_preprint":false},{"year":2015,"finding":"JIP3 binding to KHC (not KLC) activates tetrameric kinesin-1 motility and is essential for axon elongation in hippocampal neurons and axon regeneration in sensory neurons; approximately four JIP3 molecules bind per KHC dimer; JIP3 binding to KLC engages kinesin-1 with microtubules.","method":"In vitro motility assay (single-molecule), stoichiometry analysis, hippocampal/sensory neuron culture with separation-of-function mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution motility assay with mutagenesis plus neuronal functional validation, single lab","pmids":["25944905"],"is_preprint":false},{"year":2015,"finding":"JSAP1/JIP3 and JLP regulate kinesin-1-dependent axonal transport with functional redundancy; JSAP1/JLP binding to kinesin-1 heavy chain is required for kinesin-1/microtubule interactions; defective kinesin-1 transport in Jsap1/Jlp double-KO neurons leads to intra-axonal Ca2+ rise, JNK hyperactivation, and neuronal death via calpain and c-Jun activation.","method":"Double conditional knockout mice, primary neuron culture, gene rescue, calcium imaging, JNK inhibition, calpain inhibition","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic double KO with rescue, mechanistic dissection of death pathway, single lab with multiple orthogonal methods","pmids":["25571974"],"is_preprint":false},{"year":2015,"finding":"ARF6 together with JIP3 and JIP4 regulate MT1-MMP endosome positioning and exocytosis in breast cancer cells; JIP3/JIP4 are recruited by WASH on MT1-MMP endosomes where they recruit dynein-dynactin and kinesin-1; plasma membrane ARF6 coordinates dynein/dynactin-kinesin-1 tug-of-war leading to endosome tubulation and MT1-MMP exocytosis.","method":"siRNA silencing, live-cell imaging, co-IP, co-localization, invasion assay","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP, live imaging, functional silencing, single lab","pmids":["26504170"],"is_preprint":false},{"year":2017,"finding":"JIP3 knockout mouse neurons accumulate lysosomes within focal axonal swellings that contain high levels of BACE1 and presenilin-2, leading to elevated Aβ peptide; JIP3 haploinsufficiency worsens amyloid plaque pathology in an AD mouse model, establishing JIP3 as a critical regulator of axonal lysosome transport and amyloidogenic APP processing.","method":"JIP3 knockout primary neuron culture, mouse AD model with haploinsufficiency, immunofluorescence, Aβ ELISA, western blot","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO neurons plus in vivo mouse model with quantitative Aβ readout, replicated in human iPSC neurons (PMID 33788575)","pmids":["28784610"],"is_preprint":false},{"year":2017,"finding":"JIP1 and JIP3 cooperate to relieve kinesin-1 autoinhibition for TrkB anterograde axonal transport: JIP1 binds KHC and KLC while JIP3 binds KLC; their combined binding is essential for TrkB transport and BDNF-induced retrograde signaling.","method":"JIP1 knockout mice, sciatic nerve ligation, live imaging in microfluidic chambers, microtubule-binding assay","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mice, live imaging, biochemical microtubule assay, single lab","pmids":["28638935"],"is_preprint":false},{"year":2017,"finding":"UNC-16/JIP3 is present on Golgi and is required for polarized distribution of synaptic vesicle proteins (SVPs) in neurons; UNC-16 acts through LRK-1/LRRK2, which regulates Golgi localization of AP-1 μ-subunit; UNC-16 and LRK-1 together via AP-3 regulate SVP transport carrier composition at the Golgi.","method":"C. elegans genetics, immunofluorescence, co-IP, fluorescent reporter imaging","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — genetic epistasis, co-IP, imaging, single lab","pmids":["29145394"],"is_preprint":false},{"year":2019,"finding":"JSAP1/JIP3 and JLP are required for ARF6 localization to the midbody during cytokinesis; they form a tripartite complex with active ARF6 and kinesin-1 heavy chain; JSAP1/JLP mutants unable to bind active ARF6 or KHC fail to rescue ARF6 midbody localization, and double-KO delays cytokinesis.","method":"Knockout mouse embryonic fibroblasts, co-IP, rescue with mutants, live imaging","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO rescue with structure-function mutants, co-IP, single lab","pmids":["25130574"],"is_preprint":false},{"year":2019,"finding":"JIP3 (together with dynein) is required for macropinosome formation and inward movement in HT1080 cells; microtubule depolymerization or JIP3 depletion blocks commitment to macropinosome formation, and ARF6 (a JIP3-interacting protein) is also required.","method":"siRNA silencing, live-cell imaging, microtubule depolymerization, co-IP","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional silencing with imaging, single lab","pmids":["30969891"],"is_preprint":false},{"year":2019,"finding":"The N-terminal RH1 domain of JIP3 binds dynein light intermediate chain (DLIC); the RH1-LZI tandem forms a high-affinity homodimer with elongated alpha-helical structure; kinesin-1 KHC binding site overlaps with the RH1 domain; the RH1 domain of JIP3 also interacts with myosin 5A in vitro, suggesting JIP3 is a potential myosin 5A adaptor.","method":"Biophysical/structural (homology modelling, SAXS), pull-down assay for myosin 5A interaction, bioinformatic analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1–3 / Moderate — structural characterization with in vitro binding validation, single lab; myosin interaction is only in vitro","pmids":["31690808"],"is_preprint":false},{"year":2021,"finding":"Loss of JIP3 in human iPSC-derived neurons causes axonal lysosome accumulation and elevated Aβ42; JIP4 has an overlapping role with JIP3 in axonal lysosome transport, shown by double knockdown experiments.","method":"iPSC-derived neuron model, JIP3/JIP4 KO, lysosome imaging, Aβ42 measurement","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human iPSC model with quantitative imaging and biochemical readouts, single lab","pmids":["33788575"],"is_preprint":false},{"year":2022,"finding":"Human dynein light intermediate chain (DLIC) binds the N-terminal RH1 domain of JIP3 (and JIP4 and RILP); a point mutation in RH1 abrogates DLIC binding without disrupting KHC binding; in C. elegans, JIP3 that cannot bind DLIC causes prominent endo-lysosomal organelle accumulation at neurite tips; rescuing kinesin light chain binding (leucine zipper mutation) rescues this phenotype, establishing that JIP3-bound dynein is required for organelle clearance and that RH1 is a dual motor-binding hub.","method":"Co-IP/pull-down (human proteins), separation-of-function point mutations, C. elegans in vivo imaging, genetic rescue","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — separation-of-function mutagenesis, in vitro binding, in vivo C. elegans phenotypic rescue, multiple orthogonal methods","pmids":["35829703"],"is_preprint":false},{"year":2022,"finding":"JIP3 depletion in human neurons causes dynamic focal lysosome accumulations accompanied by disruption of the axonal periodic scaffold (spectrin, F-actin, myosin II) throughout affected axons and local microtubule disorganization at lysosome-filled swellings, linking JIP3-dependent lysosome transport to axonal cytoskeleton maintenance.","method":"JIP3 KO iPSC neurons, super-resolution/structured illumination microscopy, cytoskeletal marker imaging","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO human neurons with multiple cytoskeletal markers, single lab","pmids":["35013510"],"is_preprint":false},{"year":2022,"finding":"DCX negatively regulates dynein-mediated retrograde transport by reducing dynein association with microtubules and disrupting dynein motor complex composition; JIP3 binds dynein and dynactin to form an active motor complex with two dyneins per complex; DCX competes with the second dynein binding, reducing velocity.","method":"Purified component reconstitution, single-molecule motility assay, Dcx KO mouse neurons, co-IP","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified components plus mutagenesis plus KO neurons, multiple orthogonal methods","pmids":["36476638"],"is_preprint":false},{"year":2022,"finding":"Loss of MAPK8IP3/JIP3 in human iPSC-derived neurons (i3Neurons) impairs bulk endocytic uptake without affecting lysosomal proteolytic activity in cell bodies, indicating JIP3 regulates endocytosis in neurons.","method":"MAPK8IP3 KO iPSC-derived neurons, endocytosis assay, lysosome activity assay","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — human iPSC KO model with functional assays, single lab","pmids":["35711470"],"is_preprint":false},{"year":2023,"finding":"JIP3 and JIP4 are activating adaptors for dynein on autophagosomes and lysosomes; GTP-bound ARF6 promotes formation of the JIP3/4-dynein-dynactin complex; RAB10 coordinates opposing dynein and kinesin motor activities on autophagosomes; knockdown or overexpression of RAB10 stalls transport.","method":"Lysate-based single-molecule motility assay, live-cell imaging in primary neurons, siRNA knockdown, ARF6/RAB10 GTPase mutants","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — single-molecule motility reconstitution plus live neuronal imaging plus GTPase epistasis, single lab","pmids":["37909920"],"is_preprint":false},{"year":2025,"finding":"The disease-associated R578C missense mutation in JIP3 is a toxic gain-of-function that alters JIP3's interactome, disrupts axonal transport of late endosomes, increases JNK signaling leading to apoptosis, and disrupts dopamine receptor 1 (but not DR2) signaling; ~80% reduction of mutant JIP3 by antisense oligonucleotides was tolerated in vitro.","method":"Patient iPSC/cell lines, interactome MS, late endosome transport imaging, JNK activity assay, dopamine receptor signaling assay, ASO treatment","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cellular assays in disease-relevant context, single lab, no independent replication yet","pmids":["40111412"],"is_preprint":false}],"current_model":"JIP3/MAPK8IP3 is a neuronally enriched scaffold protein that simultaneously organizes JNK-pathway signaling (by directly binding and co-activating MEKK1, SEK1/MKK4/MKK7, and JNK via distinct domains, a process regulated by phosphorylation by ASK1 and ROCK1) and serves as a bidirectional motor adaptor (binding kinesin-1 KHC and KLC to activate anterograde transport, and binding dynein DLIC via its RH1 domain to drive retrograde transport), thereby controlling axonal transport of lysosomes, late endosomes, autophagosomes, and TrkB receptors; loss of JIP3 causes focal axonal lysosome accumulations that amplify amyloidogenic APP processing, disrupt the axonal cytoskeleton, and ultimately lead to neurodegeneration, while disease-associated gain-of-function variants additionally perturb the motor interactome and dopaminergic signaling."},"narrative":{"mechanistic_narrative":"MAPK8IP3 (JIP3/JSAP1) is a neuronally enriched scaffold protein that couples JNK-pathway signaling to microtubule-based intracellular transport [PMID:10523642, PMID:21750526]. As a signaling scaffold, it directly binds and assembles the JNK kinase cascade — MEKK1, SEK1/MKK4 and MKK7, and JNK3 — into an activatable complex, with phosphorylation by ASK1 and ROCK1 enhancing kinase recruitment and JNK activation in response to oxidative and stress stimuli [PMID:10523642, PMID:12189133, PMID:19036714]. In parallel, JIP3 functions as a bidirectional motor adaptor: it binds kinesin-1 through both kinesin light chain and, independently, kinesin heavy chain to activate anterograde motility and engage microtubules [PMID:11106729, PMID:21750526, PMID:25944905], while its N-terminal RH1 domain binds dynein light intermediate chain to form an activating dynein-dynactin complex for retrograde transport, making RH1 a dual motor-binding hub whose kinesin and dynein sites overlap [PMID:31690808, PMID:35829703, PMID:36476638, PMID:37909920]. Through these motor interactions — coordinated by GTP-bound ARF6 and RAB10 — JIP3 controls axonal transport and positioning of lysosomes, late endosomes, autophagosomes, and the TrkB receptor [PMID:21775604, PMID:23633144, PMID:35829703, PMID:37909920]. JIP3 is required for neuronal development and survival, restricting axon branching via GSK3β–doublecortin signaling and driving axon elongation through kinesin- and JNK-dependent cytoskeletal remodeling [PMID:21159948, PMID:23576431], and germline loss is perinatally lethal with telencephalic commissure defects [PMID:12897243]. Loss of JIP3 produces focal axonal lysosome accumulations enriched in BACE1 and presenilin-2 that amplify amyloidogenic APP processing and elevate Aβ, disrupt the axonal periodic cytoskeleton, and lead to neurodegeneration [PMID:28784610, PMID:33788575, PMID:35013510]; the disease-associated R578C gain-of-function variant remodels the JIP3 interactome, impairs late-endosome transport, hyperactivates JNK-driven apoptosis, and perturbs dopamine receptor 1 signaling [PMID:40111412].","teleology":[{"year":1999,"claim":"Established JIP3 as a JNK-pathway scaffold, answering how upstream and downstream JNK cascade kinases are organized into a productive signaling module.","evidence":"Yeast two-hybrid, co-IP in COS-7 cells, and deletion mutants showing direct binding to JNK3, SEK1, and MEKK1 with module-dependent JNK3 activation","pmids":["10523642"],"confidence":"High","gaps":["Did not establish stimulus-specific or tissue-specific regulation of complex assembly","No structural basis for the simultaneous binding of three kinases"]},{"year":2000,"claim":"Linked the JNK scaffold to motor transport by showing JIP3 binds kinesin-1 light chain, establishing it as a candidate kinesin cargo adaptor in brain.","evidence":"Yeast two-hybrid, in vitro Kd measurement (~200 nM to KLC TPR), brain co-IP, and GFP imaging on tubulovesicular structures; neuronal expression and growth-cone localization shown in parallel","pmids":["11106729","10629060"],"confidence":"High","gaps":["Did not determine which cargoes are transported","Did not distinguish adaptor role from a regulatory role on the motor"]},{"year":2002,"claim":"Resolved how scaffolding activity is controlled, showing ASK1 phosphorylation of JIP3 is required to recruit and activate JNK upon oxidative stress.","evidence":"In vitro kinase assay, co-IP, H2O2 stimulation, and mutational analysis; ROCK1 later identified as a second activating kinase via TAP and ROCK1+/- mice","pmids":["12189133","19036714"],"confidence":"High","gaps":["Phosphosite identity and stoichiometry not fully mapped","Interplay between ASK1 and ROCK1 inputs not resolved"]},{"year":2003,"claim":"Defined an in vivo developmental requirement, showing JIP3 is essential for telencephalic commissure formation upstream of RhoA-ROCK signaling.","evidence":"Germline Jip3 knockout mice with perinatal lethality and corpus callosum defects; JIP1 transgenic rescue and reduced phospho-FAK/phospho-JNK shown by an independent lab","pmids":["12897243","15572149"],"confidence":"High","gaps":["Did not separate scaffolding from transport contributions to the phenotype","Cell-autonomous versus non-autonomous requirement unresolved"]},{"year":2011,"claim":"Demonstrated JIP3 actively activates kinesin-1 and bridges kinesin to dynein, redefining it from passive adaptor to motor regulator and bidirectional transport coordinator.","evidence":"In vitro single-molecule motility assays showing KHC-dependent activation, separation-of-function mutants, plus C. elegans co-IP and genetics showing UNC-16 links kinesin-1 to dynein DLIC for retrograde cargo transport","pmids":["21750526","21307258"],"confidence":"High","gaps":["Structural basis of KHC activation not defined at this stage","How directionality is switched between motors unresolved"]},{"year":2013,"claim":"Established JIP3 as an organelle gatekeeper and a positive driver of process outgrowth, clarifying its dual roles in restricting organelle escape and promoting axon elongation.","evidence":"C. elegans EM and quantitative live imaging showing AIS-localized UNC-16 inhibits organelle escape; hippocampal neuron deletion mutants showing kinesin- and JNK-dependent axon elongation via cofilin/actin","pmids":["23633144","23576431"],"confidence":"High","gaps":["Mechanism distinguishing gatekeeping from transport not fully resolved","Did not identify the full cargo set retained at the AIS"]},{"year":2011,"claim":"Identified specific receptor cargo, showing JIP3 binds TrkB and selectively drives its axonal anterograde transport to support BDNF signaling.","evidence":"Co-IP, juxtamembrane domain mapping, live axonal transport imaging, and BDNF/Erk signaling readouts in hippocampal neurons; JIP1/JIP3 cooperativity in relieving kinesin-1 autoinhibition shown later","pmids":["21775604","28638935"],"confidence":"High","gaps":["Selectivity for axons over dendrites mechanistically unexplained","Other receptor cargoes not surveyed"]},{"year":2017,"claim":"Connected JIP3 transport function to neurodegenerative pathology, showing loss causes axonal lysosome accumulation that amplifies amyloidogenic APP processing.","evidence":"JIP3 knockout primary neurons and an AD mouse model with haploinsufficiency, showing BACE1/PS2-laden focal swellings and elevated Aβ; replicated in human iPSC neurons with JIP4 overlap","pmids":["28784610","33788575"],"confidence":"High","gaps":["Causal chain from lysosome stalling to Aβ generation not fully dissected","Contribution of JIP4 redundancy to disease threshold unclear"]},{"year":2019,"claim":"Provided structural identity to the dual motor hub, localizing dynein DLIC and kinesin KHC binding to an overlapping N-terminal RH1 domain.","evidence":"Homology modeling/SAXS of the RH1-LZI tandem homodimer and pull-down assays; human DLIC binding and separation-of-function RH1 point mutations with C. elegans rescue established RH1 as a dual motor-binding hub","pmids":["31690808","35829703"],"confidence":"High","gaps":["High-resolution structure of motor-bound RH1 not determined","Functional significance of the in vitro myosin 5A interaction in cells unresolved"]},{"year":2023,"claim":"Defined how directional transport is regulated by small GTPases, showing JIP3 activates dynein on autophagosomes/lysosomes under ARF6 and RAB10 control.","evidence":"Lysate-based single-molecule motility assays, live neuronal imaging, and ARF6/RAB10 GTPase mutants; DCX shown by reconstitution to compete with the second dynein and slow JIP3-dynein-dynactin transport","pmids":["37909920","36476638"],"confidence":"High","gaps":["How RAB10 toggles between opposing motors mechanistically unresolved","Cargo-specific GTPase code not fully mapped"]},{"year":2022,"claim":"Linked JIP3-dependent lysosome transport to axonal integrity, showing depletion disrupts the periodic spectrin/actin scaffold and local microtubules.","evidence":"JIP3 KO iPSC neurons with super-resolution imaging of cytoskeletal markers at lysosome-filled swellings","pmids":["35013510"],"confidence":"Medium","gaps":["Whether cytoskeletal disruption is cause or consequence of lysosome accumulation unresolved","Single lab, single model system"]},{"year":2025,"claim":"Established a disease mechanism for a pathogenic variant, showing R578C is a toxic gain-of-function that remodels the interactome and dysregulates transport, JNK, and dopamine signaling.","evidence":"Patient iPSC/cell lines with interactome MS, late-endosome transport imaging, JNK and dopamine receptor signaling assays, and ASO knockdown","pmids":["40111412"],"confidence":"Medium","gaps":["No independent replication of the gain-of-function mechanism","In vivo correlate of dopamine receptor 1 dysregulation not established"]},{"year":null,"claim":"How JIP3 integrates its scaffolding (JNK), gatekeeping, and bidirectional motor functions into a single regulated switch on individual cargoes remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of a JIP3-cargo-dual-motor assembly in a defined state","Mechanism coordinating JNK signaling output with transport activity unknown","Cargo-specific rules governing anterograde vs retrograde commitment undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,11,17,27,31]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,11,17,25,27,29,31]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[11,17,29,31]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[11,28]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,13,14,31]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[20,27,28,31]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[14,22]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,3]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[11,13,14,27,31]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,17,19,31]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,8]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,9,15]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[20,32]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[31]}],"complexes":["JNK signaling module (MEKK1-SEK1/MKK4/MKK7-JNK)","dynein-dynactin transport complex","kinesin-1 (KHC/KLC)"],"partners":["KLC","KHC","DLIC","ARF6","JNK3","MKK4","TRKB","RAB10"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UPT6","full_name":"C-Jun-amino-terminal kinase-interacting protein 3","aliases":["JNK MAP kinase scaffold protein 3","Mitogen-activated protein kinase 8-interacting protein 3"],"length_aa":1336,"mass_kda":147.5,"function":"The JNK-interacting protein (JIP) group of scaffold proteins selectively mediates JNK signaling by aggregating specific components of the MAPK cascade to form a functional JNK signaling module (PubMed:12189133). May function as a regulator of vesicle transport, through interactions with the JNK-signaling components and motor proteins (By similarity). Promotes neuronal axon elongation in a kinesin- and JNK-dependent manner. Activates cofilin at axon tips via local activation of JNK, thereby regulating filopodial dynamics and enhancing axon elongation. Its binding to kinesin heavy chains (KHC), promotes kinesin-1 motility along microtubules and is essential for axon elongation and regeneration. Regulates cortical neuronal migration by mediating NTRK2/TRKB anterograde axonal transport during brain development (By similarity). Acts as an adapter that bridges the interaction between NTRK2/TRKB and KLC1 and drives NTRK2/TRKB axonal but not dendritic anterograde transport, which is essential for subsequent BDNF-triggered signaling and filopodia formation (PubMed:21775604)","subcellular_location":"Cytoplasm; Golgi apparatus; Cytoplasmic vesicle; Cell projection, growth cone; Cell projection, axon; Cell projection, dendrite; Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/Q9UPT6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MAPK8IP3","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MAPK8IP3","total_profiled":1310},"omim":[{"mim_id":"618443","title":"NEURODEVELOPMENTAL DISORDER WITH OR WITHOUT VARIABLE BRAIN ABNORMALITIES; 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deletion of the JNK- or MEKK1-binding regions reduced JNK3 activation.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation in COS-7 cells, in vitro binding assay, deletion mutant analysis, kinase activation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro binding plus cell-based co-IP plus mutagenesis, independently replicated across multiple subsequent studies\",\n      \"pmids\": [\"10523642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"JIP3 (mouse SYD/JSAP1) was shown to bind kinesin-I via the tetratricopeptide repeat (TPR) domain of kinesin light chain (KLC) with Kd ~200 nM, and GFP-tagged mammalian SYD localizes to tubulovesicular structures that co-stain for kinesin-I and a secretory pathway marker; co-immunoprecipitation confirmed the complex forms in vivo in mouse brain.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding/affinity measurement, co-immunoprecipitation, GFP live-cell imaging\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Kd measured in vitro, co-IP in vivo, subcellular localization, replicated by multiple subsequent studies\",\n      \"pmids\": [\"11106729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"JIP3 is expressed predominantly in the brain (lower levels in heart) and accumulates in growth cones of developing neurites, establishing its neuronal subcellular localization.\",\n      \"method\": \"Immunofluorescence, Northern/Western blot\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Strong — localization established by immunofluorescence in multiple papers but without direct functional consequence shown in this paper alone\",\n      \"pmids\": [\"10629060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ASK1 phosphorylates JIP3/JSAP1 in vitro and in vivo; this phosphorylation enhances interactions of JSAP1 with SEK1/MKK4, MKK7, and JNK3, and is required for JSAP1 to recruit and activate JNK in response to H2O2, establishing a phosphorylation-dependent scaffolding mechanism.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, H2O2 stimulation assay, mutational analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro phosphorylation assay plus in vivo co-IP plus functional rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"12189133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Alternative splicing of the JSAP1 gene generates four isoforms (JSAP1a–d); the JNK-binding domain maps to aa 201–217 (exon 6); isoforms JSAP1c and JSAP1d, which contain an extra 31-aa sequence, show lower binding affinity for JNKs (especially JNK3), suggesting they may attenuate scaffolding activity.\",\n      \"method\": \"cDNA cloning, exon-intron mapping, co-immunoprecipitation binding assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — domain mapping by co-IP and deletion analysis, single lab\",\n      \"pmids\": [\"11024282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Germline Jip3 knockout mice die at birth and display severe defects in telencephalic commissure (corpus callosum) morphogenesis; the phenotype is partly attributable to reduced RhoA/ROCK signaling, placing JIP3 upstream of RhoA-ROCK in brain commissure development.\",\n      \"method\": \"Targeted gene disruption (knockout mice), histological analysis, signaling pathway assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined morphological and signaling phenotype, replicated by independent lab (PMID 15572149)\",\n      \"pmids\": [\"12897243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"JSAP1/JIP3 forms a complex with focal adhesion kinase (FAK) and mediates FAK/p130Cas-dependent JNK activation in response to fibronectin; JSAP1 co-localizes with JNK and phospho-FAK at the leading edge and stimulates cell migration in a JNK-binding-domain-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, co-expression/transfection, immunofluorescence co-localization, migration assay, dominant-negative constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal co-IP, functional rescue, localization, single lab\",\n      \"pmids\": [\"16141199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Transgenic expression of JIP1 partially rescued the corpus callosum and anterior commissure axon guidance defects of jsap1-/- mice, and JIP3-null brains showed reduced phospho-FAK and phospho-JNK distribution, linking JIP3 to FAK and JNK signaling in commissure axon guidance in vivo.\",\n      \"method\": \"Transgenic rescue in knockout mice, Western blot/immunohistochemistry\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic rescue experiment, single lab, limited mechanistic depth\",\n      \"pmids\": [\"15572149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ROCK1 was identified as an upstream activator of JIP3; upon UVB stress in keratinocytes, ROCK1 binds JIP3 and phosphorylates it, which is required for JNK recruitment to JIP3 and subsequent JNK activation and apoptosis.\",\n      \"method\": \"Tandem affinity purification, co-IP, phosphorylation assay, ROCK1 inhibition, ROCK1+/- mice\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — TAP identification, kinase assay, in vivo mouse validation, multiple orthogonal methods\",\n      \"pmids\": [\"19036714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"JIP3 restriction of axon branching in cerebellar granule neurons is mediated by GSK3β: JIP3 knockdown reduces GSK3β levels, and GSK3β knockdown phenocopies JIP3 knockdown; GSK3β phosphorylates doublecortin (DCX) at Ser327 to restrict axon branching downstream of JIP3.\",\n      \"method\": \"shRNA knockdown, in utero electroporation, kinase assay (GSK3β phosphorylation of DCX), cerebellar slice and in vivo rat models\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — epistasis by double knockdown, in vitro kinase assay, in vivo electroporation, multiple orthogonal methods\",\n      \"pmids\": [\"21159948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ARF6 GTP-bound form interacts with JIP3 (via the LZII region), and JIP3 acts as a downstream effector of ARF6 to regulate neurite morphogenesis in cortical neurons; overexpression of an ARF6 dominant-negative mutant unable to bind JIP3, or JIP3 knockdown, both stimulate neurite elongation and branching.\",\n      \"method\": \"Pull-down/co-IP, dominant-negative ARF6 mutant, JIP3 knockdown, neurite morphology assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — protein interaction plus functional knockdown, single lab\",\n      \"pmids\": [\"20493856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sunday Driver (JIP3/syd) interacts directly with kinesin heavy chain (KHC) via a domain independent of KLC; syd activates KHC for transport in an in vitro motility assay, increasing both KHC velocity and run length; syd mutants that bind KHC but not KLC are still transported to axons and dendrites.\",\n      \"method\": \"In vitro binding/pull-down, in vitro single-molecule motility assay, neuronal transport assay with separation-of-function mutants\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution motility assay with mutagenesis, neuronal validation; replicated by PMID 25944905\",\n      \"pmids\": [\"21750526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"C. elegans UNC-16/JIP3 binds dynein light intermediate (DLI) chain and links kinesin-1 to dynein; both kinesin-1 and UNC-16 are required for localization of DLI-1 at microtubule plus-ends; retrograde transport of APL-1 depends on kinesin-1, UNC-16, and dynein, demonstrating that kinesin-1/UNC-16 mediates anterograde transport of dynein for subsequent retrograde cargo transport.\",\n      \"method\": \"Co-IP, genetic loss-of-function, live imaging in C. elegans\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP plus genetic epistasis plus in vivo imaging, replicated by multiple JIP3-dynein interaction studies\",\n      \"pmids\": [\"21307258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"JIP3 binds directly to TrkB via a 12 aa juxtamembrane domain and links TrkB to kinesin-1, selectively driving TrkB anterograde transport in axons (but not dendrites) of hippocampal neurons; JIP3-mediated TrkB axonal transport enhances BDNF-induced Erk activation and axonal filopodia formation.\",\n      \"method\": \"Co-IP, deletion mutant binding assay, live axonal transport imaging, BDNF signaling assay\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct binding domain mapped, transport imaging, functional signaling readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21775604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"C. elegans UNC-16/JIP3 acts as an organelle gatekeeper at the axon initial segment (AIS): loss of UNC-16 causes up to 10-fold accumulation of Golgi, endosomes, and lysosomes (but not ER) in axons; UNC-16 is concentrated at the AIS and inhibits organelle escape past the AIS rather than promoting anterograde transport.\",\n      \"method\": \"Electron microscopy, quantitative live imaging of tagged organelles, time-lapse microscopy in C. elegans\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EM plus quantitative live imaging plus regional analysis, single lab with multiple orthogonal methods; functionally places JIP3 at AIS as gatekeeper\",\n      \"pmids\": [\"23633144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"JIP3 promotes axon elongation in hippocampal neurons via kinesin-dependent transport to axon tips and JNK-dependent modulation of cofilin and actin dynamics; deletion mutants lacking the kinesin-binding or JNK-binding domain abolish the elongation effect.\",\n      \"method\": \"Gain/loss-of-function, deletion mutants, in utero electroporation, immunofluorescence of cofilin phosphorylation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple deletion mutants and in vivo electroporation, single lab\",\n      \"pmids\": [\"23576431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Drosophila Syd/JIP3 specifically regulates kinesin- and dynein-dependent cortical pulling of myonuclei without affecting motor activity near the nucleus; Syd mediates kinesin-dependent localization of dynein to muscle ends, and JNK signaling acts upstream of Syd to promote this cortical dynein localization.\",\n      \"method\": \"Drosophila genetics (loss-of-function), live imaging, epistasis analysis, rescue with mammalian JIP3\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis, rescue with mammalian JIP3 confirming conservation, single lab\",\n      \"pmids\": [\"25522254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"JIP3 binding to KHC (not KLC) activates tetrameric kinesin-1 motility and is essential for axon elongation in hippocampal neurons and axon regeneration in sensory neurons; approximately four JIP3 molecules bind per KHC dimer; JIP3 binding to KLC engages kinesin-1 with microtubules.\",\n      \"method\": \"In vitro motility assay (single-molecule), stoichiometry analysis, hippocampal/sensory neuron culture with separation-of-function mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution motility assay with mutagenesis plus neuronal functional validation, single lab\",\n      \"pmids\": [\"25944905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"JSAP1/JIP3 and JLP regulate kinesin-1-dependent axonal transport with functional redundancy; JSAP1/JLP binding to kinesin-1 heavy chain is required for kinesin-1/microtubule interactions; defective kinesin-1 transport in Jsap1/Jlp double-KO neurons leads to intra-axonal Ca2+ rise, JNK hyperactivation, and neuronal death via calpain and c-Jun activation.\",\n      \"method\": \"Double conditional knockout mice, primary neuron culture, gene rescue, calcium imaging, JNK inhibition, calpain inhibition\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic double KO with rescue, mechanistic dissection of death pathway, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"25571974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ARF6 together with JIP3 and JIP4 regulate MT1-MMP endosome positioning and exocytosis in breast cancer cells; JIP3/JIP4 are recruited by WASH on MT1-MMP endosomes where they recruit dynein-dynactin and kinesin-1; plasma membrane ARF6 coordinates dynein/dynactin-kinesin-1 tug-of-war leading to endosome tubulation and MT1-MMP exocytosis.\",\n      \"method\": \"siRNA silencing, live-cell imaging, co-IP, co-localization, invasion assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP, live imaging, functional silencing, single lab\",\n      \"pmids\": [\"26504170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"JIP3 knockout mouse neurons accumulate lysosomes within focal axonal swellings that contain high levels of BACE1 and presenilin-2, leading to elevated Aβ peptide; JIP3 haploinsufficiency worsens amyloid plaque pathology in an AD mouse model, establishing JIP3 as a critical regulator of axonal lysosome transport and amyloidogenic APP processing.\",\n      \"method\": \"JIP3 knockout primary neuron culture, mouse AD model with haploinsufficiency, immunofluorescence, Aβ ELISA, western blot\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO neurons plus in vivo mouse model with quantitative Aβ readout, replicated in human iPSC neurons (PMID 33788575)\",\n      \"pmids\": [\"28784610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"JIP1 and JIP3 cooperate to relieve kinesin-1 autoinhibition for TrkB anterograde axonal transport: JIP1 binds KHC and KLC while JIP3 binds KLC; their combined binding is essential for TrkB transport and BDNF-induced retrograde signaling.\",\n      \"method\": \"JIP1 knockout mice, sciatic nerve ligation, live imaging in microfluidic chambers, microtubule-binding assay\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice, live imaging, biochemical microtubule assay, single lab\",\n      \"pmids\": [\"28638935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"UNC-16/JIP3 is present on Golgi and is required for polarized distribution of synaptic vesicle proteins (SVPs) in neurons; UNC-16 acts through LRK-1/LRRK2, which regulates Golgi localization of AP-1 μ-subunit; UNC-16 and LRK-1 together via AP-3 regulate SVP transport carrier composition at the Golgi.\",\n      \"method\": \"C. elegans genetics, immunofluorescence, co-IP, fluorescent reporter imaging\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — genetic epistasis, co-IP, imaging, single lab\",\n      \"pmids\": [\"29145394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"JSAP1/JIP3 and JLP are required for ARF6 localization to the midbody during cytokinesis; they form a tripartite complex with active ARF6 and kinesin-1 heavy chain; JSAP1/JLP mutants unable to bind active ARF6 or KHC fail to rescue ARF6 midbody localization, and double-KO delays cytokinesis.\",\n      \"method\": \"Knockout mouse embryonic fibroblasts, co-IP, rescue with mutants, live imaging\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO rescue with structure-function mutants, co-IP, single lab\",\n      \"pmids\": [\"25130574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"JIP3 (together with dynein) is required for macropinosome formation and inward movement in HT1080 cells; microtubule depolymerization or JIP3 depletion blocks commitment to macropinosome formation, and ARF6 (a JIP3-interacting protein) is also required.\",\n      \"method\": \"siRNA silencing, live-cell imaging, microtubule depolymerization, co-IP\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional silencing with imaging, single lab\",\n      \"pmids\": [\"30969891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The N-terminal RH1 domain of JIP3 binds dynein light intermediate chain (DLIC); the RH1-LZI tandem forms a high-affinity homodimer with elongated alpha-helical structure; kinesin-1 KHC binding site overlaps with the RH1 domain; the RH1 domain of JIP3 also interacts with myosin 5A in vitro, suggesting JIP3 is a potential myosin 5A adaptor.\",\n      \"method\": \"Biophysical/structural (homology modelling, SAXS), pull-down assay for myosin 5A interaction, bioinformatic analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–3 / Moderate — structural characterization with in vitro binding validation, single lab; myosin interaction is only in vitro\",\n      \"pmids\": [\"31690808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of JIP3 in human iPSC-derived neurons causes axonal lysosome accumulation and elevated Aβ42; JIP4 has an overlapping role with JIP3 in axonal lysosome transport, shown by double knockdown experiments.\",\n      \"method\": \"iPSC-derived neuron model, JIP3/JIP4 KO, lysosome imaging, Aβ42 measurement\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human iPSC model with quantitative imaging and biochemical readouts, single lab\",\n      \"pmids\": [\"33788575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Human dynein light intermediate chain (DLIC) binds the N-terminal RH1 domain of JIP3 (and JIP4 and RILP); a point mutation in RH1 abrogates DLIC binding without disrupting KHC binding; in C. elegans, JIP3 that cannot bind DLIC causes prominent endo-lysosomal organelle accumulation at neurite tips; rescuing kinesin light chain binding (leucine zipper mutation) rescues this phenotype, establishing that JIP3-bound dynein is required for organelle clearance and that RH1 is a dual motor-binding hub.\",\n      \"method\": \"Co-IP/pull-down (human proteins), separation-of-function point mutations, C. elegans in vivo imaging, genetic rescue\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — separation-of-function mutagenesis, in vitro binding, in vivo C. elegans phenotypic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"35829703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"JIP3 depletion in human neurons causes dynamic focal lysosome accumulations accompanied by disruption of the axonal periodic scaffold (spectrin, F-actin, myosin II) throughout affected axons and local microtubule disorganization at lysosome-filled swellings, linking JIP3-dependent lysosome transport to axonal cytoskeleton maintenance.\",\n      \"method\": \"JIP3 KO iPSC neurons, super-resolution/structured illumination microscopy, cytoskeletal marker imaging\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO human neurons with multiple cytoskeletal markers, single lab\",\n      \"pmids\": [\"35013510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DCX negatively regulates dynein-mediated retrograde transport by reducing dynein association with microtubules and disrupting dynein motor complex composition; JIP3 binds dynein and dynactin to form an active motor complex with two dyneins per complex; DCX competes with the second dynein binding, reducing velocity.\",\n      \"method\": \"Purified component reconstitution, single-molecule motility assay, Dcx KO mouse neurons, co-IP\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified components plus mutagenesis plus KO neurons, multiple orthogonal methods\",\n      \"pmids\": [\"36476638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of MAPK8IP3/JIP3 in human iPSC-derived neurons (i3Neurons) impairs bulk endocytic uptake without affecting lysosomal proteolytic activity in cell bodies, indicating JIP3 regulates endocytosis in neurons.\",\n      \"method\": \"MAPK8IP3 KO iPSC-derived neurons, endocytosis assay, lysosome activity assay\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — human iPSC KO model with functional assays, single lab\",\n      \"pmids\": [\"35711470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"JIP3 and JIP4 are activating adaptors for dynein on autophagosomes and lysosomes; GTP-bound ARF6 promotes formation of the JIP3/4-dynein-dynactin complex; RAB10 coordinates opposing dynein and kinesin motor activities on autophagosomes; knockdown or overexpression of RAB10 stalls transport.\",\n      \"method\": \"Lysate-based single-molecule motility assay, live-cell imaging in primary neurons, siRNA knockdown, ARF6/RAB10 GTPase mutants\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — single-molecule motility reconstitution plus live neuronal imaging plus GTPase epistasis, single lab\",\n      \"pmids\": [\"37909920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The disease-associated R578C missense mutation in JIP3 is a toxic gain-of-function that alters JIP3's interactome, disrupts axonal transport of late endosomes, increases JNK signaling leading to apoptosis, and disrupts dopamine receptor 1 (but not DR2) signaling; ~80% reduction of mutant JIP3 by antisense oligonucleotides was tolerated in vitro.\",\n      \"method\": \"Patient iPSC/cell lines, interactome MS, late endosome transport imaging, JNK activity assay, dopamine receptor signaling assay, ASO treatment\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cellular assays in disease-relevant context, single lab, no independent replication yet\",\n      \"pmids\": [\"40111412\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"JIP3/MAPK8IP3 is a neuronally enriched scaffold protein that simultaneously organizes JNK-pathway signaling (by directly binding and co-activating MEKK1, SEK1/MKK4/MKK7, and JNK via distinct domains, a process regulated by phosphorylation by ASK1 and ROCK1) and serves as a bidirectional motor adaptor (binding kinesin-1 KHC and KLC to activate anterograde transport, and binding dynein DLIC via its RH1 domain to drive retrograde transport), thereby controlling axonal transport of lysosomes, late endosomes, autophagosomes, and TrkB receptors; loss of JIP3 causes focal axonal lysosome accumulations that amplify amyloidogenic APP processing, disrupt the axonal cytoskeleton, and ultimately lead to neurodegeneration, while disease-associated gain-of-function variants additionally perturb the motor interactome and dopaminergic signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MAPK8IP3 (JIP3/JSAP1) is a neuronally enriched scaffold protein that couples JNK-pathway signaling to microtubule-based intracellular transport [#0, #11]. As a signaling scaffold, it directly binds and assembles the JNK kinase cascade — MEKK1, SEK1/MKK4 and MKK7, and JNK3 — into an activatable complex, with phosphorylation by ASK1 and ROCK1 enhancing kinase recruitment and JNK activation in response to oxidative and stress stimuli [#0, #3, #8]. In parallel, JIP3 functions as a bidirectional motor adaptor: it binds kinesin-1 through both kinesin light chain and, independently, kinesin heavy chain to activate anterograde motility and engage microtubules [#1, #11, #17], while its N-terminal RH1 domain binds dynein light intermediate chain to form an activating dynein-dynactin complex for retrograde transport, making RH1 a dual motor-binding hub whose kinesin and dynein sites overlap [#25, #27, #29, #31]. Through these motor interactions — coordinated by GTP-bound ARF6 and RAB10 — JIP3 controls axonal transport and positioning of lysosomes, late endosomes, autophagosomes, and the TrkB receptor [#13, #14, #27, #31]. JIP3 is required for neuronal development and survival, restricting axon branching via GSK3β–doublecortin signaling and driving axon elongation through kinesin- and JNK-dependent cytoskeletal remodeling [#9, #15], and germline loss is perinatally lethal with telencephalic commissure defects [#5]. Loss of JIP3 produces focal axonal lysosome accumulations enriched in BACE1 and presenilin-2 that amplify amyloidogenic APP processing and elevate Aβ, disrupt the axonal periodic cytoskeleton, and lead to neurodegeneration [#20, #26, #28]; the disease-associated R578C gain-of-function variant remodels the JIP3 interactome, impairs late-endosome transport, hyperactivates JNK-driven apoptosis, and perturbs dopamine receptor 1 signaling [#32].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established JIP3 as a JNK-pathway scaffold, answering how upstream and downstream JNK cascade kinases are organized into a productive signaling module.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP in COS-7 cells, and deletion mutants showing direct binding to JNK3, SEK1, and MEKK1 with module-dependent JNK3 activation\",\n      \"pmids\": [\"10523642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish stimulus-specific or tissue-specific regulation of complex assembly\", \"No structural basis for the simultaneous binding of three kinases\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Linked the JNK scaffold to motor transport by showing JIP3 binds kinesin-1 light chain, establishing it as a candidate kinesin cargo adaptor in brain.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro Kd measurement (~200 nM to KLC TPR), brain co-IP, and GFP imaging on tubulovesicular structures; neuronal expression and growth-cone localization shown in parallel\",\n      \"pmids\": [\"11106729\", \"10629060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not determine which cargoes are transported\", \"Did not distinguish adaptor role from a regulatory role on the motor\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved how scaffolding activity is controlled, showing ASK1 phosphorylation of JIP3 is required to recruit and activate JNK upon oxidative stress.\",\n      \"evidence\": \"In vitro kinase assay, co-IP, H2O2 stimulation, and mutational analysis; ROCK1 later identified as a second activating kinase via TAP and ROCK1+/- mice\",\n      \"pmids\": [\"12189133\", \"19036714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphosite identity and stoichiometry not fully mapped\", \"Interplay between ASK1 and ROCK1 inputs not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined an in vivo developmental requirement, showing JIP3 is essential for telencephalic commissure formation upstream of RhoA-ROCK signaling.\",\n      \"evidence\": \"Germline Jip3 knockout mice with perinatal lethality and corpus callosum defects; JIP1 transgenic rescue and reduced phospho-FAK/phospho-JNK shown by an independent lab\",\n      \"pmids\": [\"12897243\", \"15572149\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate scaffolding from transport contributions to the phenotype\", \"Cell-autonomous versus non-autonomous requirement unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated JIP3 actively activates kinesin-1 and bridges kinesin to dynein, redefining it from passive adaptor to motor regulator and bidirectional transport coordinator.\",\n      \"evidence\": \"In vitro single-molecule motility assays showing KHC-dependent activation, separation-of-function mutants, plus C. elegans co-IP and genetics showing UNC-16 links kinesin-1 to dynein DLIC for retrograde cargo transport\",\n      \"pmids\": [\"21750526\", \"21307258\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of KHC activation not defined at this stage\", \"How directionality is switched between motors unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established JIP3 as an organelle gatekeeper and a positive driver of process outgrowth, clarifying its dual roles in restricting organelle escape and promoting axon elongation.\",\n      \"evidence\": \"C. elegans EM and quantitative live imaging showing AIS-localized UNC-16 inhibits organelle escape; hippocampal neuron deletion mutants showing kinesin- and JNK-dependent axon elongation via cofilin/actin\",\n      \"pmids\": [\"23633144\", \"23576431\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism distinguishing gatekeeping from transport not fully resolved\", \"Did not identify the full cargo set retained at the AIS\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified specific receptor cargo, showing JIP3 binds TrkB and selectively drives its axonal anterograde transport to support BDNF signaling.\",\n      \"evidence\": \"Co-IP, juxtamembrane domain mapping, live axonal transport imaging, and BDNF/Erk signaling readouts in hippocampal neurons; JIP1/JIP3 cooperativity in relieving kinesin-1 autoinhibition shown later\",\n      \"pmids\": [\"21775604\", \"28638935\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity for axons over dendrites mechanistically unexplained\", \"Other receptor cargoes not surveyed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected JIP3 transport function to neurodegenerative pathology, showing loss causes axonal lysosome accumulation that amplifies amyloidogenic APP processing.\",\n      \"evidence\": \"JIP3 knockout primary neurons and an AD mouse model with haploinsufficiency, showing BACE1/PS2-laden focal swellings and elevated Aβ; replicated in human iPSC neurons with JIP4 overlap\",\n      \"pmids\": [\"28784610\", \"33788575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal chain from lysosome stalling to Aβ generation not fully dissected\", \"Contribution of JIP4 redundancy to disease threshold unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided structural identity to the dual motor hub, localizing dynein DLIC and kinesin KHC binding to an overlapping N-terminal RH1 domain.\",\n      \"evidence\": \"Homology modeling/SAXS of the RH1-LZI tandem homodimer and pull-down assays; human DLIC binding and separation-of-function RH1 point mutations with C. elegans rescue established RH1 as a dual motor-binding hub\",\n      \"pmids\": [\"31690808\", \"35829703\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution structure of motor-bound RH1 not determined\", \"Functional significance of the in vitro myosin 5A interaction in cells unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined how directional transport is regulated by small GTPases, showing JIP3 activates dynein on autophagosomes/lysosomes under ARF6 and RAB10 control.\",\n      \"evidence\": \"Lysate-based single-molecule motility assays, live neuronal imaging, and ARF6/RAB10 GTPase mutants; DCX shown by reconstitution to compete with the second dynein and slow JIP3-dynein-dynactin transport\",\n      \"pmids\": [\"37909920\", \"36476638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RAB10 toggles between opposing motors mechanistically unresolved\", \"Cargo-specific GTPase code not fully mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked JIP3-dependent lysosome transport to axonal integrity, showing depletion disrupts the periodic spectrin/actin scaffold and local microtubules.\",\n      \"evidence\": \"JIP3 KO iPSC neurons with super-resolution imaging of cytoskeletal markers at lysosome-filled swellings\",\n      \"pmids\": [\"35013510\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether cytoskeletal disruption is cause or consequence of lysosome accumulation unresolved\", \"Single lab, single model system\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established a disease mechanism for a pathogenic variant, showing R578C is a toxic gain-of-function that remodels the interactome and dysregulates transport, JNK, and dopamine signaling.\",\n      \"evidence\": \"Patient iPSC/cell lines with interactome MS, late-endosome transport imaging, JNK and dopamine receptor signaling assays, and ASO knockdown\",\n      \"pmids\": [\"40111412\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No independent replication of the gain-of-function mechanism\", \"In vivo correlate of dopamine receptor 1 dysregulation not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How JIP3 integrates its scaffolding (JNK), gatekeeping, and bidirectional motor functions into a single regulated switch on individual cargoes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of a JIP3-cargo-dual-motor assembly in a defined state\", \"Mechanism coordinating JNK signaling output with transport activity unknown\", \"Cargo-specific rules governing anterograde vs retrograde commitment undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 11, 17, 27, 31]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 11, 17, 25, 27, 29, 31]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [11, 17, 29, 31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [11, 28]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 13, 14, 31]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [20, 27, 28, 31]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [14, 22]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [11, 13, 14, 27, 31]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 17, 19, 31]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 8]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 9, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [20, 32]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [31]}\n    ],\n    \"complexes\": [\"JNK signaling module (MEKK1-SEK1/MKK4/MKK7-JNK)\", \"dynein-dynactin transport complex\", \"kinesin-1 (KHC/KLC)\"],\n    \"partners\": [\"KLC\", \"KHC\", \"DLIC\", \"ARF6\", \"JNK3\", \"MKK4\", \"TrkB\", \"RAB10\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}