{"gene":"KIF3A","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":1994,"finding":"KIF3A (FLA10/KHP1) encodes a kinesin-homologous protein required for intraflagellar transport (IFT) and flagellar assembly/maintenance in Chlamydomonas; temperature-sensitive inactivation of FLA10 abolishes both bidirectional IFT particle movement and bead motility on the flagellar membrane, and KHP1 protein immunolocalizes to the region between outer doublet microtubules and the flagellar membrane.","method":"Temperature-sensitive mutant analysis, immunolocalization, light microscopy of IFT particles, electron microscopy of flagellar rafts","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent papers (PMID 8522608, 8027176) using loss-of-function, rescue transformation, and direct protein localization, replicated across labs","pmids":["8522608","8027176"],"is_preprint":false},{"year":1994,"finding":"KIF3A is a microtubule plus end-directed (anterograde) motor in neurons; recombinant KIF3A heavy chain demonstrates plus end-directed microtubule motility in vitro, native KIF3A associates with membrane organelle fractions, and KIF3A accumulates with anterogradely moving organelles after nerve ligation.","method":"In vitro microtubule gliding assay with baculovirus-expressed KIF3A, nerve ligation accumulation assay, subcellular fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstituted motor activity plus independent nerve ligation assay, replicated in follow-up work","pmids":["7515068"],"is_preprint":false},{"year":1995,"finding":"KIF3A forms a heterodimer with KIF3B; recombinant KIF3A/B complex (~50 nm rod with two globular heads and a single globular tail) demonstrates plus end-directed microtubule sliding activity in vitro; the complex associates with membrane fractions other than synaptic vesicles and with membranous organelles.","method":"Baculovirus reconstitution, immunoprecipitation, in vitro microtubule sliding assay, electron microscopy, subcellular fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted heterodimer in vitro with microtubule sliding assay plus structural EM characterization","pmids":["7559760"],"is_preprint":false},{"year":1996,"finding":"KAP3 (kinesin superfamily-associated protein 3) binds to the tail domain of KIF3A/B in a globular region; reconstitution in Sf9 cells shows KAP3 is a globular protein that binds KIF3A/B tail without affecting KIF3A/B motor activity; KAP3 associates with the membrane-bound form of KIF3A/B and may regulate membrane organelle binding.","method":"Baculovirus-Sf9 reconstitution, immunoprecipitation, fractional immunoprecipitation, EM","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted complex in Sf9 cells with domain-level characterization, single lab with multiple orthogonal methods","pmids":["8710890"],"is_preprint":false},{"year":1996,"finding":"FLA10/KHP1 activity is required specifically for inner dynein arms (but not outer dynein arms) to reach the distal portion of the flagellar axoneme; rescue experiments in dikaryons at non-permissive temperature for fla10 show inner dynein arm assembly is blocked while outer dynein arm rescue proceeds normally.","method":"Dikaryon rescue assay with immunofluorescence using inner and outer dynein arm markers at permissive and non-permissive temperatures","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean epistasis via dikaryon rescue with temperature-sensitive allele, two distinct cargo markers tested, rigorous controls","pmids":["8609169"],"is_preprint":false},{"year":1996,"finding":"FLA10/KHP1 localizes to basal bodies and the proximal portion of flagella in interphase, moves in punctate structures to the tip of developing axonemes during flagellar regeneration, and associates with centrioles and the mitotic spindle during cell division; a C-to-A transversion at amino acid 329 in the motor domain causes the fla10-1 temperature-sensitive phenotype.","method":"Immunofluorescence throughout cell cycle, mutant sequencing, flagellar regeneration assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct immunolocalization at multiple cell cycle stages, mutation identified in motor domain, replicated across labs","pmids":["8907700"],"is_preprint":false},{"year":1998,"finding":"KIF3A forms a novel neuronal heteromeric kinesin with KIF3C (but not KIF3B); KIF3C associates with KIF3A by immunoprecipitation and co-fractionates with a distinct population of membrane vesicles in neurons.","method":"Immunoprecipitation, sucrose density gradient fractionation, subcellular fractionation","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — reciprocal co-IP showing KIF3C-KIF3A interaction, but limited functional follow-up in this paper","pmids":["9487132"],"is_preprint":false},{"year":1998,"finding":"KAP3 (SMAP) binds to HCAP (human XCAP-E condensin subunit) and both KAP3 and HCAP are present in nuclear fractions; SMAP is extracted as a ternary complex with HCAP and KIF3B from the nuclear fraction in the presence of Mg-ATP, suggesting KAP3 serves as a linker between chromosomal condensin and KIF3A/B in the nucleus.","method":"Subcellular fractionation, immunoprecipitation from nuclear fraction, yeast two-hybrid","journal":"The Journal of biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single co-IP from nuclear fraction, functional significance not directly tested","pmids":["9506951"],"is_preprint":false},{"year":1999,"finding":"KIF3A localizes to two distinct sites in vertebrate photoreceptors: the basal body of the connecting cilium axoneme and the presynaptic ribbon; immunoelectron microscopy shows KIF3A at the ribbon matrix and on docked vesicles, suggesting dual functions within a single cell type.","method":"Immunoelectron microscopy, subcellular fractionation (detergent-extractable and resistant fractions)","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunoEM with two fractionation approaches, single lab","pmids":["9920666"],"is_preprint":false},{"year":1999,"finding":"KIF3A is essential for embryonic cilia formation at the node; KIF3A knockout mice die at ~10 dpc with randomized left-right asymmetry, and the earliest detectable abnormality is loss of nodal cilia at E7.5 prior to asymmetric gene expression, demonstrating kinesin-based transport for ciliary morphogenesis is conserved from Chlamydomonas to mammals.","method":"Knockout mouse generation, scanning electron microscopy of embryonic node, whole-mount in situ hybridization of L-R markers","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with SEM and in situ validation, replicated across two independent labs (PMID 10220415 and 10330409)","pmids":["10220415","10330409"],"is_preprint":false},{"year":1999,"finding":"KIF3A forms a heterotrimeric KIF3 complex with KIF3B (or KIF3C) and KAP3; the complex is ubiquitously expressed but predominantly in neural tissues.","method":"Immunoprecipitation from mouse brain, co-purification","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunoprecipitation confirming trimeric complex, replicated from prior work","pmids":["10330409"],"is_preprint":false},{"year":2000,"finding":"GADD34 interacts with the tail domain of KIF3A; this interaction was identified by yeast two-hybrid screening and confirmed by in vivo two-hybrid analysis in NIH3T3 cells.","method":"Yeast two-hybrid, in vivo two-hybrid assay in mammalian cells","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, yeast two-hybrid only with in vivo confirmation but no functional follow-up","pmids":["10631107"],"is_preprint":false},{"year":2002,"finding":"The neck-hinge region of KIF3A (residues 356-416) contains a predicted coiled-coil (residues 356-377) that folds autonomously in solution; electrostatic attractions between oppositely charged unstructured regions drive specificity of heterodimerization of the KIF3A coiled-coil, without affecting stability relative to the most stable homodimer.","method":"Circular dichroism spectroscopy, redox disulfide exchange experiments, urea denaturation studies of synthetic peptide analogs","journal":"Journal of structural biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — biophysical reconstitution with multiple analogs and mutagenesis-equivalent approaches, single lab","pmids":["12064947"],"is_preprint":false},{"year":2003,"finding":"Kidney-specific inactivation of KIF3A abolishes primary cilia on renal tubular epithelial cells and produces polycystic kidney disease; cyst epithelial cells show increased proliferation and apoptosis, apical mislocalization of EGF receptor, increased β-catenin and c-Myc expression, and inhibition of p21CIP1.","method":"Conditional knockout (Cre-lox) in kidney epithelia, histology, immunofluorescence, Western blot","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific conditional knockout with detailed molecular phenotyping, multiple orthogonal readouts","pmids":["12672950"],"is_preprint":false},{"year":2006,"finding":"Loss of KIF3A in rod photoreceptors (via synchronous Cre-mediated excision) causes ectopic accumulation of opsin before photoreceptor degeneration, with normal cilium and disc membrane formation initially; this establishes opsin as a primary KIF3A-dependent cargo in photoreceptor cells.","method":"Conditional knockout (RHO-Cre;Kif3a-flox), Western blot time course, immunofluorescence, histology","journal":"Investigative ophthalmology & visual science","confidence":"High","confidence_rationale":"Tier 2 / Strong — synchronous excision allowing precise temporal dissection, multiple timepoints, clean identification of ectopic opsin as primary lesion","pmids":["17065525"],"is_preprint":false},{"year":2007,"finding":"Kif3a loss restrains canonical Wnt/β-catenin signaling through two mechanisms: (1) a ciliary mechanism shared with other ciliogenic gene mutations (Ift88, Ofd1) that normally restricts Wnt pathway activity, and (2) a non-ciliary mechanism specific to Kif3a loss, involving constitutive CKI-dependent phosphorylation of Dishevelled (Dvl); pharmacological inhibition of casein kinase I reverses constitutive Dvl phosphorylation and abrogates pathway hyper-responsiveness.","method":"Conditional knockout mouse embryos and primary fibroblasts, phosphorylation assays, CKI inhibitor treatment, genetic comparison of three ciliogenic mutations","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — three separate ciliogenic mutations compared, CKI inhibitor rescue, multiple cell types, single lab with multiple orthogonal approaches","pmids":["18084282"],"is_preprint":false},{"year":2010,"finding":"KIF3A and KIF3B kinesins regulate MT1-MMP-positive vesicle transport bidirectionally along microtubules in primary human macrophages; siRNA knockdown of KIF3A/KIF3B impairs MT1-MMP delivery to the cell surface, shedding of CD44 and syndecan-1, and ECM degradation at podosomes.","method":"siRNA knockdown, live-cell imaging of MT1-MMP vesicles, flow cytometry, ECM degradation assay","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging plus functional readouts in primary cells, single lab","pmids":["20505159"],"is_preprint":false},{"year":2011,"finding":"Kif3a regulates planar polarization of auditory hair cells through both ciliary mechanisms (kinocilium formation) and non-ciliary mechanisms; the non-ciliary function involves Kif3a-regulated localized cortical activity of PAK kinases, which controls basal body positioning along the apicobasal and planar polarity axes.","method":"Conditional knockout in inner ear, immunofluorescence of PAK activity/localization, basal body positioning analysis","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockout with PAK activity readout distinguishing ciliary vs. non-ciliary mechanisms, single lab","pmids":["21752934"],"is_preprint":false},{"year":2011,"finding":"RNF33/TRIM60 interacts with KIF3A and KIF3B via its RB and B30.2 domains binding to the respective C-terminal non-motor tail domains; this interaction is independent of the KAP3 adaptor, leaving the motor head section free for cargo binding.","method":"Yeast two-hybrid, co-immunoprecipitation, deletion mapping","journal":"Molecular and cellular biochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, yeast two-hybrid with co-IP confirmation, but no functional follow-up on cargo transport","pmids":["21909995"],"is_preprint":false},{"year":2012,"finding":"The Axin/TNKS2 complex interacts with KIF3A to form a ternary complex required for insulin-stimulated GLUT4 translocation to the plasma membrane; in the absence of insulin, Axin/TNKS2/KIF3A co-localize with GLUT4 on the trans-Golgi network; insulin suppresses TNKS ADP-ribosylase activity, stabilizing the complex via Akt; specific knockdown of each component attenuates GLUT4 translocation.","method":"Co-immunoprecipitation, siRNA knockdown, co-localization imaging, glucose uptake assays, TNKS2 knockout mice","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus genetic (KO mouse) and pharmacological (Akt inhibitor) epistasis, single lab","pmids":["22473005"],"is_preprint":false},{"year":2013,"finding":"KIF3A is required for spermatid elongation, sperm tail formation, and manchette function; depletion of KIF3A causes severe impairments in sperm tail formation and affects manchette organization and nuclear shaping; several novel interacting partners were identified including MNS1, which co-localizes with KIF3A in the manchette and principal piece.","method":"Conditional knockout, co-immunoprecipitation/interactor identification, immunofluorescence co-localization","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO phenotype plus interactor identification by co-IP, single lab","pmids":["23831641"],"is_preprint":false},{"year":2013,"finding":"Kif3a depletion in MDCK cells slows epithelial cell migration, dampens microtubule dynamics at the leading edge (microtubules fail to grow perpendicularly into the leading edge), retards lateral membrane specification, and completely prevents formation of 3D lumen-containing spheres in collagen; these are extra-ciliary functions.","method":"Tetracycline-inducible Kif3a knockdown, live-cell microtubule dynamics imaging, wound-healing migration assay, 3D collagen sphere assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inducible depletion with live imaging and multiple functional readouts, single lab","pmids":["23658710"],"is_preprint":false},{"year":2015,"finding":"KIF3A processivity is controlled by rear head gating rather than front head gating: rearward strain in the two-head-bound state does not alter nucleotide binding to the front head (no front-head gating), but the motor dissociates slowly from the low-affinity ADP state (rear head gating); the KIF3A/B heterodimer shows load-dependent properties intermediate between the two homodimers, attributable to motor domain properties rather than neck linkers or coiled-coil stalk.","method":"Stopped-flow and steady-state kinetics, single-molecule motility assays, optical trap with feedback control, multimotor assays, AMP-PNP trapping, neck-linker length mutants","journal":"The Journal of biological chemistry / Current biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — two independent papers (PMID 25657001, 25866395) using reconstituted motors with multiple biophysical methods including optical trapping and kinetics","pmids":["25657001","25866395"],"is_preprint":false},{"year":2015,"finding":"PKA and CaMKIIα phosphorylate the C-terminus of KIF3A to regulate activity-dependent loading of N-cadherin cargo; phosphorylation of the KIF3A C-terminal domain increases N-cadherin transport to dendritic spines, and this transport is enhanced during homeostatic synaptic upregulation (TTX treatment); mutagenesis of the phosphosites abrogates activity-dependent N-cadherin transport.","method":"Quantitative phosphoproteomics of KIF3A-bound vs. unbound cargo vesicles, site-directed mutagenesis, kinase inhibitors, live-cell N-cadherin transport imaging, TTX-induced homeostatic plasticity","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1 / Moderate — phosphoproteomics identifies sites, mutagenesis confirms function, live imaging of transport, kinase inhibitor validation; single lab with multiple orthogonal methods","pmids":["26335646"],"is_preprint":false},{"year":2015,"finding":"HSV-1 viral kinase US3 phosphorylates KIF3A predominantly at serine 687, both in vitro and in infected cells; this phosphorylation is required for US3-mediated downregulation of CD1d cell surface expression; ablation of the S687 phosphorylation site abolishes US3-mediated CD1d downregulation.","method":"Mass spectrometry of purified KIF3A, in vitro kinase assay, phosphosite mutagenesis (S687A), CD1d surface expression assay","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay, mass spectrometry site identification, phosphosite mutagenesis with functional rescue, single lab with multiple orthogonal methods","pmids":["25878107"],"is_preprint":false},{"year":2016,"finding":"KIF3A binds β-arrestin; in NSCLC cells KIF3A depletion allows β-arrestin to form a complex with DVL2 and Axin, thereby stabilizing β-catenin and activating Wnt signaling independently of primary cilia; pharmacological inhibition of ciliogenesis did not increase β-catenin activity, confirming a non-ciliary mechanism.","method":"siRNA knockdown, co-immunoprecipitation of KIF3A-β-arrestin, β-catenin reporter assays, pharmacological ciliogenesis inhibition","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of KIF3A-β-arrestin interaction plus pharmacological and genetic dissection of ciliary vs. non-ciliary pathway, single lab","pmids":["27596264"],"is_preprint":false},{"year":2022,"finding":"KIF3A and KIF13A coordinate to transport the same MT1-MMP-containing vesicles from the trans-Golgi to endosomes, while KIF13A alone transports vesicles from endosomes to the plasma membrane; knockdown of KIF3A and KIF13A inhibits MT1-MMP-dependent collagen degradation and cancer cell invasion.","method":"siRNA knockdown, live-cell imaging of MT1-MMP vesicles, collagen degradation assay, invasion assay","journal":"Matrix biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging plus functional knockdown assays distinguishing KIF3A and KIF13A roles in sequential transport steps, single lab","pmids":["35122963"],"is_preprint":false},{"year":2024,"finding":"KIF3A directly binds Disabled-1 (Dab1) via the cargo-binding domain (CBD) at its C-terminus; the PTB domain-containing region of Dab1 is essential for KIF3A binding; this interaction is specific to KIF3A (not KIF3B, KIF5B, KIF17, or KAP3); KIF3A dominant-negative expression reduces ApoER2 cell surface expression, suggesting KIF3A transports ApoER2 to the cell surface.","method":"Yeast two-hybrid screen, GST pulldown, co-immunoprecipitation in HEK-293T cells, immunofluorescence co-localization, dominant-negative expression assay for ApoER2 surface expression","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by GST pulldown and reciprocal co-IP with functional readout, single lab","pmids":["38919020"],"is_preprint":false},{"year":2024,"finding":"KIF3A tail domain phosphorylation is dispensable for ciliogenesis in mammalian mouse embryonic fibroblasts; a library of phosphomimetic mutants covering all predicted phosphosites in the KIF3A tail domain rescued ciliogenesis normally in Kif3a-/-;Kif3b-/- MEFs, contrasting with the previously proposed requirement for phosphorylation in IFT regulation.","method":"Kif3a-/-;Kif3b-/- MEF ciliogenesis rescue assay with library of phosphomimetic KIF3A tail mutants","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis of all predicted phosphosites in clean double-KO rescue assay, single lab; this is a negative finding that contradicts prior reports","pmids":["38405607"],"is_preprint":false},{"year":2024,"finding":"KIF3A (within the KIF3A/KIF3B/KAP3 heterotrimer) is autoinhibited via a conserved beta-hairpin motif in the kinesin-2 tail domain that sequesters motor domains away from microtubules through molecular mimicry; KAP3 binds via a multipartite interface with KIF3A and KIF3B and provides a platform for cargo adaptor engagement that occludes the beta-hairpin, thereby activating motility; the APC cargo adaptor engages this platform to relieve autoinhibition.","method":"Cryo-EM structural determination, single-molecule motility assays, cell biological assays, mutagenesis of beta-hairpin motif","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure plus single-molecule assays and mutagenesis in one study; preprint but comprehensive mechanistic data","pmids":[],"is_preprint":true},{"year":2025,"finding":"High-resolution cryo-EM structures of the KIF3A/KIF3B/KAP3 complex bound to APC cargo reveal a 'Hitchdock domain' in the KIF3 tail that mediates interactions with both KAP3 adaptor and APC cargo; KIF3A helical regions within the Hitchdock domain mediate specific cargo binding, while the beta-hairpin region and KIF3B provide structural support; mutagenesis and molecular dynamics simulations confirm the domain's functional importance.","method":"Cryo-EM structure determination, site-directed mutagenesis, molecular dynamics simulations","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution cryo-EM structure with mutagenesis and MD validation; preprint","pmids":[],"is_preprint":true},{"year":2024,"finding":"KIF3A associates with KIFC1 to regulate expression and polar localization of NuMA and γ-tubulin during mouse oocyte meiosis; KIF3A depletion activates the spindle assembly checkpoint leading to metaphase I arrest; KIF3A also reduces microtubule stability through altered deacetylation by HDAC6; KIF3A is required for proper organelle (mitochondria, Golgi, ER) distribution in oocytes.","method":"KIF3A depletion (siRNA/morpholino), LC-MS interactome analysis, immunofluorescence, spindle assembly checkpoint markers, HDAC6 activity assay, mRNA rescue","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — depletion plus mRNA rescue with LC-MS interactome and multiple functional readouts, single lab","pmids":["38587639"],"is_preprint":false}],"current_model":"KIF3A is the motor subunit of the heterotrimeric kinesin-2 complex (KIF3A/KIF3B/KAP3) that drives anterograde, plus end-directed transport of membrane organelles, ciliary/flagellar components (via intraflagellar transport), and specific cargoes including opsin, N-cadherin, MT1-MMP vesicles, GLUT4, CD1d, and ApoER2 along microtubules; its motor activity is regulated by autoinhibition through a beta-hairpin motif in the tail domain that is relieved upon KAP3 and cargo adaptor (e.g., APC) binding, and by phosphorylation of the C-terminal tail domain by PKA and CaMKIIα for activity-dependent cargo loading; additionally, KIF3A exerts non-ciliary signaling functions by restraining canonical Wnt/β-catenin signaling through sequestration of β-arrestin and by promoting CKI-dependent Dishevelled phosphorylation, while its role in ciliogenesis is essential for hedgehog signal transduction and establishment of left-right asymmetry."},"narrative":{"mechanistic_narrative":"KIF3A is the motor subunit of the heterotrimeric kinesin-2 complex that drives microtubule plus end-directed (anterograde) transport of membrane organelles and ciliary cargo [PMID:7515068, PMID:7559760]. It functions as a plus end-directed motor both as a recombinant heavy chain and as a heterodimer with KIF3B that forms a ~50 nm rod with two motor heads and a single tail, which associates with membranous organelles [PMID:7515068, PMID:7559760]; addition of the non-motor adaptor KAP3 to the KIF3A/B tail produces the heterotrimeric KIF3 complex and couples the motor to membrane cargo without altering intrinsic motor activity [PMID:8710890, PMID:10330409], and KIF3A can substitute KIF3C for KIF3B to form distinct neuronal motors [PMID:9487132]. The motor is held inactive by an autoinhibitory beta-hairpin motif in the kinesin-2 tail that mimics microtubule binding; KAP3 binding provides a multipartite cargo-adaptor platform — engaged through a tail 'Hitchdock domain' — that occludes the beta-hairpin and is relieved by adaptors such as APC to license motility. Mechanistically the heterodimer is processive through rear-head gating, with load-dependent properties intermediate between the homodimers and set by the motor domains [PMID:25657001, PMID:25866395]. Functionally, KIF3A is the ancestral intraflagellar transport motor required for flagellar/ciliary assembly from Chlamydomonas to mammals: it localizes between axonemal doublets and the ciliary membrane, drives IFT particle movement, and is needed for inner dynein arm delivery to the distal axoneme [PMID:8522608, PMID:8027176, PMID:8609169, PMID:10220415, PMID:10330409]; loss of KIF3A ablates nodal cilia and randomizes left-right asymmetry, and kidney-specific loss removes primary cilia and produces polycystic kidney disease with elevated beta-catenin and c-Myc [PMID:10220415, PMID:10330409, PMID:12672950]. As a transport motor it delivers specific cargoes including opsin in photoreceptors [PMID:17065525], N-cadherin to dendritic spines under activity-dependent control [PMID:26335646], MT1-MMP vesicles for matrix degradation and invasion [PMID:20505159, PMID:35122963], GLUT4 with the Axin/TNKS2 complex during insulin signaling [PMID:22473005], and ApoER2 via direct binding to Dab1 [PMID:38919020]. Beyond cilia, KIF3A restrains canonical Wnt/beta-catenin signaling through a non-ciliary mechanism involving constitutive CKI-dependent Dishevelled phosphorylation and sequestration of beta-arrestin from a DVL2/Axin complex [PMID:18084282, PMID:27596264]. The KIF3A C-terminal tail is a phosphoregulatory hub: PKA and CaMKIIalpha phosphorylation regulates cargo loading [PMID:26335646] and HSV-1 kinase US3 phosphorylates Ser687 to downregulate CD1d [PMID:25878107], although systematic phosphomimetic analysis shows tail phosphorylation is dispensable for ciliogenesis itself [PMID:38405607]. KIF3A additionally contributes to epithelial migration and lumen morphogenesis [PMID:23658710] and to spindle and organelle organization in oocyte meiosis [PMID:38587639].","teleology":[{"year":1994,"claim":"Established the founding function of KIF3A as the motor required for intraflagellar transport and flagellar assembly, defining its ancestral role before any vertebrate work.","evidence":"Temperature-sensitive FLA10/KHP1 mutant analysis with IFT particle imaging and immunolocalization in Chlamydomonas","pmids":["8522608","8027176"],"confidence":"High","gaps":["Did not define the molecular cargo carried by IFT","Motor directionality not directly demonstrated in this organism"]},{"year":1994,"claim":"Defined KIF3A as a plus end-directed (anterograde) microtubule motor associated with membrane organelles, settling its directionality and transport role.","evidence":"In vitro microtubule gliding with baculovirus-expressed KIF3A, nerve ligation accumulation, and fractionation in neurons","pmids":["7515068"],"confidence":"High","gaps":["Functional cargo identity unresolved","Subunit composition of the native motor not yet established"]},{"year":1995,"claim":"Showed KIF3A operates as a heterodimer with KIF3B, establishing the obligate two-headed motor architecture.","evidence":"Baculovirus reconstitution, IP, in vitro sliding assay and EM of the recombinant KIF3A/B rod","pmids":["7559760"],"confidence":"High","gaps":["Did not identify the cargo-coupling adaptor","Regulation of motor activity not addressed"]},{"year":1996,"claim":"Identified KAP3 as the third subunit binding the KIF3A/B tail, completing the heterotrimer and implicating it in membrane organelle coupling.","evidence":"Sf9 reconstitution, fractional IP, and EM domain mapping","pmids":["8710890"],"confidence":"High","gaps":["How KAP3 selects specific cargo not defined","Mechanism of activity regulation by KAP3 not resolved"]},{"year":1996,"claim":"Refined the IFT role by showing FLA10/KHP1 is specifically required to deliver inner (not outer) dynein arms to the distal axoneme, and localized the motor through the cell cycle.","evidence":"Dikaryon rescue epistasis with dynein arm markers; immunolocalization and motor-domain mutation sequencing in Chlamydomonas","pmids":["8609169","8907700"],"confidence":"High","gaps":["Cargo selectivity mechanism for dynein arms unknown","Mitotic spindle association function not functionally tested"]},{"year":1998,"claim":"Expanded the motor repertoire by showing KIF3A can pair with KIF3C to form a distinct neuronal motor on a separate vesicle population.","evidence":"Reciprocal co-IP and sucrose gradient fractionation in neurons","pmids":["9487132"],"confidence":"Medium","gaps":["Distinct cargo of the KIF3A/C motor not identified","Functional difference from KIF3A/B not established"]},{"year":1998,"claim":"Proposed a nuclear, condensin-linked role for the complex via KAP3-HCAP interaction.","evidence":"Yeast two-hybrid and nuclear-fraction co-IP","pmids":["9506951"],"confidence":"Low","gaps":["Functional significance not directly tested","Single co-IP from nuclear fraction without reciprocal in vivo validation"]},{"year":1999,"claim":"Demonstrated that the Chlamydomonas IFT function is conserved in mammals and essential for embryonic ciliogenesis and left-right asymmetry.","evidence":"Kif3a knockout mice with node SEM and in situ hybridization of L-R markers; brain IP confirming the heterotrimer","pmids":["10220415","10330409"],"confidence":"High","gaps":["Cargo transported into nodal cilia not identified","Mechanism linking cilia to asymmetric gene expression not resolved here"]},{"year":1999,"claim":"Revealed dual subcellular roles of KIF3A within a single cell type by localizing it to both the photoreceptor connecting cilium and the presynaptic ribbon.","evidence":"ImmunoEM and fractionation in vertebrate photoreceptors","pmids":["9920666"],"confidence":"Medium","gaps":["Synaptic ribbon function of KIF3A not functionally tested","Cargo at the ribbon unidentified"]},{"year":2002,"claim":"Explained heterodimerization specificity at the biophysical level, showing electrostatic complementarity of unstructured neck-hinge regions drives selective pairing.","evidence":"CD spectroscopy, redox exchange, and urea denaturation of KIF3A coiled-coil peptide analogs","pmids":["12064947"],"confidence":"Medium","gaps":["Behavior of full-length proteins not tested","Relevance to motor regulation not addressed"]},{"year":2003,"claim":"Linked KIF3A-dependent ciliogenesis to disease and downstream signaling by showing renal cilium loss causes polycystic kidney disease with altered beta-catenin signaling.","evidence":"Kidney-specific conditional knockout with histology and molecular phenotyping","pmids":["12672950"],"confidence":"High","gaps":["Whether signaling changes are cilium-dependent or independent not separated here","Direct cargo underlying cyst phenotype unknown"]},{"year":2006,"claim":"Identified opsin as a primary KIF3A-dependent transport cargo, distinguishing a transport defect from structural cilium failure.","evidence":"Synchronous RHO-Cre conditional knockout with Western time course and immunofluorescence","pmids":["17065525"],"confidence":"High","gaps":["Adaptor coupling opsin to KIF3A not defined","Other photoreceptor cargoes not enumerated"]},{"year":2007,"claim":"Distinguished ciliary from non-ciliary regulation of Wnt signaling, showing KIF3A restrains the pathway in part through CKI-dependent Dishevelled phosphorylation independent of cilia.","evidence":"Conditional KO embryos/fibroblasts, phosphorylation assays, CKI inhibitor rescue, comparison of three ciliogenic mutations","pmids":["18084282"],"confidence":"High","gaps":["Molecular intermediary linking KIF3A to CKI activity unknown","Whether motor activity is required for the non-ciliary effect untested"]},{"year":2010,"claim":"Extended cargo range to MT1-MMP vesicles, connecting KIF3A to surface protease delivery and ECM degradation in macrophages.","evidence":"siRNA knockdown, live vesicle imaging, flow cytometry, ECM degradation assay","pmids":["20505159"],"confidence":"Medium","gaps":["Direct cargo adaptor not identified","Single cell type tested"]},{"year":2011,"claim":"Showed KIF3A controls planar polarity through both cilia and a non-ciliary route involving cortical PAK activity and basal body positioning.","evidence":"Inner-ear conditional knockout with PAK activity/localization and basal body analysis","pmids":["21752934"],"confidence":"Medium","gaps":["How KIF3A regulates cortical PAK not defined","Direct vs. indirect effect on basal body unresolved"]},{"year":2011,"claim":"Added RNF33/TRIM60 as a tail-binding partner engaging KIF3A independently of KAP3.","evidence":"Yeast two-hybrid, co-IP, deletion mapping","pmids":["21909995"],"confidence":"Low","gaps":["No functional follow-up on cargo transport","Single lab without reciprocal in vivo validation"]},{"year":2012,"claim":"Placed KIF3A in insulin-regulated GLUT4 trafficking via an Axin/TNKS2 ternary complex.","evidence":"Reciprocal co-IP, siRNA knockdown, co-localization, glucose uptake, and TNKS2 knockout mice","pmids":["22473005"],"confidence":"Medium","gaps":["Direct GLUT4-KIF3A contact not demonstrated","Single lab"]},{"year":2013,"claim":"Established extra-ciliary roles in spermatid morphogenesis and in epithelial migration, microtubule dynamics, and lumen formation.","evidence":"Conditional KO with interactor co-IP in sperm; inducible knockdown with live MT imaging, migration and 3D collagen assays in MDCK","pmids":["23831641","23658710"],"confidence":"Medium","gaps":["Mechanism linking KIF3A to leading-edge MT dynamics unknown","MNS1 interaction function not dissected"]},{"year":2015,"claim":"Resolved the motility mechanism, showing KIF3A processivity is governed by rear-head gating and that heterodimer load behavior derives from the motor domains.","evidence":"Stopped-flow kinetics, single-molecule and optical-trap assays, neck-linker mutants on reconstituted motors","pmids":["25657001","25866395"],"confidence":"High","gaps":["Did not address tail autoinhibition in this regulation","In vivo relevance of gating differences not tested"]},{"year":2015,"claim":"Defined the KIF3A C-terminal tail as a phosphoregulatory hub controlling cargo loading and exploited by a viral kinase.","evidence":"Phosphoproteomics, phosphosite mutagenesis, kinase inhibitors and live transport imaging for N-cadherin; MS, in vitro kinase and S687A mutagenesis for US3/CD1d","pmids":["26335646","25878107"],"confidence":"High","gaps":["How phosphorylation structurally alters cargo loading not resolved","Generality of phospho-control across cargoes unknown"]},{"year":2016,"claim":"Defined the molecular basis of non-ciliary Wnt restraint, showing KIF3A sequesters beta-arrestin from a DVL2/Axin complex to limit beta-catenin stabilization.","evidence":"siRNA knockdown, KIF3A-beta-arrestin co-IP, beta-catenin reporter, pharmacological ciliogenesis inhibition in NSCLC cells","pmids":["27596264"],"confidence":"Medium","gaps":["Direct beta-arrestin binding interface not mapped","Relationship to the CKI/Dvl mechanism not integrated"]},{"year":2022,"claim":"Refined MT1-MMP trafficking into sequential steps, with KIF3A and KIF13A handling Golgi-to-endosome transport relevant to cancer invasion.","evidence":"siRNA knockdown, live vesicle imaging, collagen degradation and invasion assays","pmids":["35122963"],"confidence":"Medium","gaps":["Switching mechanism between the two motors unknown","Adaptor coupling KIF3A to these vesicles undefined"]},{"year":2024,"claim":"Identified Dab1 as a direct, KIF3A-specific cargo adaptor linking the motor to ApoER2 surface delivery.","evidence":"Yeast two-hybrid, GST pulldown, co-IP, co-localization and dominant-negative ApoER2 surface assay","pmids":["38919020"],"confidence":"Medium","gaps":["In vivo requirement not tested","Single lab"]},{"year":2024,"claim":"Challenged the requirement of tail phosphorylation for ciliogenesis, showing phosphomimetic tail mutants rescue cilia in double-knockout cells.","evidence":"Phosphomimetic mutant library rescue in Kif3a-/-;Kif3b-/- MEFs","pmids":["38405607"],"confidence":"Medium","gaps":["Does not exclude phospho-control of non-ciliary cargo loading","Single lab negative finding"]},{"year":2024,"claim":"Added a meiotic role, implicating KIF3A in spindle pole protein localization, microtubule stability via HDAC6, and organelle distribution in oocytes.","evidence":"Depletion with mRNA rescue, LC-MS interactome, SAC markers, HDAC6 activity assay","pmids":["38587639"],"confidence":"Medium","gaps":["Direct vs. indirect effect on NuMA/gamma-tubulin unresolved","Single lab"]},{"year":2025,"claim":"Provided the structural mechanism of autoinhibition and cargo-mediated activation, 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to the region between outer doublet microtubules and the flagellar membrane.\",\n      \"method\": \"Temperature-sensitive mutant analysis, immunolocalization, light microscopy of IFT particles, electron microscopy of flagellar rafts\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent papers (PMID 8522608, 8027176) using loss-of-function, rescue transformation, and direct protein localization, replicated across labs\",\n      \"pmids\": [\"8522608\", \"8027176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"KIF3A is a microtubule plus end-directed (anterograde) motor in neurons; recombinant KIF3A heavy chain demonstrates plus end-directed microtubule motility in vitro, native KIF3A associates with membrane organelle fractions, and KIF3A accumulates with anterogradely moving organelles after nerve ligation.\",\n      \"method\": \"In vitro microtubule gliding assay with baculovirus-expressed KIF3A, nerve ligation accumulation assay, subcellular fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstituted motor activity plus independent nerve ligation assay, replicated in follow-up work\",\n      \"pmids\": [\"7515068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"KIF3A forms a heterodimer with KIF3B; recombinant KIF3A/B complex (~50 nm rod with two globular heads and a single globular tail) demonstrates plus end-directed microtubule sliding activity in vitro; the complex associates with membrane fractions other than synaptic vesicles and with membranous organelles.\",\n      \"method\": \"Baculovirus reconstitution, immunoprecipitation, in vitro microtubule sliding assay, electron microscopy, subcellular fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted heterodimer in vitro with microtubule sliding assay plus structural EM characterization\",\n      \"pmids\": [\"7559760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"KAP3 (kinesin superfamily-associated protein 3) binds to the tail domain of KIF3A/B in a globular region; reconstitution in Sf9 cells shows KAP3 is a globular protein that binds KIF3A/B tail without affecting KIF3A/B motor activity; KAP3 associates with the membrane-bound form of KIF3A/B and may regulate membrane organelle binding.\",\n      \"method\": \"Baculovirus-Sf9 reconstitution, immunoprecipitation, fractional immunoprecipitation, EM\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted complex in Sf9 cells with domain-level characterization, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"8710890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"FLA10/KHP1 activity is required specifically for inner dynein arms (but not outer dynein arms) to reach the distal portion of the flagellar axoneme; rescue experiments in dikaryons at non-permissive temperature for fla10 show inner dynein arm assembly is blocked while outer dynein arm rescue proceeds normally.\",\n      \"method\": \"Dikaryon rescue assay with immunofluorescence using inner and outer dynein arm markers at permissive and non-permissive temperatures\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean epistasis via dikaryon rescue with temperature-sensitive allele, two distinct cargo markers tested, rigorous controls\",\n      \"pmids\": [\"8609169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"FLA10/KHP1 localizes to basal bodies and the proximal portion of flagella in interphase, moves in punctate structures to the tip of developing axonemes during flagellar regeneration, and associates with centrioles and the mitotic spindle during cell division; a C-to-A transversion at amino acid 329 in the motor domain causes the fla10-1 temperature-sensitive phenotype.\",\n      \"method\": \"Immunofluorescence throughout cell cycle, mutant sequencing, flagellar regeneration assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct immunolocalization at multiple cell cycle stages, mutation identified in motor domain, replicated across labs\",\n      \"pmids\": [\"8907700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"KIF3A forms a novel neuronal heteromeric kinesin with KIF3C (but not KIF3B); KIF3C associates with KIF3A by immunoprecipitation and co-fractionates with a distinct population of membrane vesicles in neurons.\",\n      \"method\": \"Immunoprecipitation, sucrose density gradient fractionation, subcellular fractionation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — reciprocal co-IP showing KIF3C-KIF3A interaction, but limited functional follow-up in this paper\",\n      \"pmids\": [\"9487132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"KAP3 (SMAP) binds to HCAP (human XCAP-E condensin subunit) and both KAP3 and HCAP are present in nuclear fractions; SMAP is extracted as a ternary complex with HCAP and KIF3B from the nuclear fraction in the presence of Mg-ATP, suggesting KAP3 serves as a linker between chromosomal condensin and KIF3A/B in the nucleus.\",\n      \"method\": \"Subcellular fractionation, immunoprecipitation from nuclear fraction, yeast two-hybrid\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single co-IP from nuclear fraction, functional significance not directly tested\",\n      \"pmids\": [\"9506951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"KIF3A localizes to two distinct sites in vertebrate photoreceptors: the basal body of the connecting cilium axoneme and the presynaptic ribbon; immunoelectron microscopy shows KIF3A at the ribbon matrix and on docked vesicles, suggesting dual functions within a single cell type.\",\n      \"method\": \"Immunoelectron microscopy, subcellular fractionation (detergent-extractable and resistant fractions)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunoEM with two fractionation approaches, single lab\",\n      \"pmids\": [\"9920666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"KIF3A is essential for embryonic cilia formation at the node; KIF3A knockout mice die at ~10 dpc with randomized left-right asymmetry, and the earliest detectable abnormality is loss of nodal cilia at E7.5 prior to asymmetric gene expression, demonstrating kinesin-based transport for ciliary morphogenesis is conserved from Chlamydomonas to mammals.\",\n      \"method\": \"Knockout mouse generation, scanning electron microscopy of embryonic node, whole-mount in situ hybridization of L-R markers\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with SEM and in situ validation, replicated across two independent labs (PMID 10220415 and 10330409)\",\n      \"pmids\": [\"10220415\", \"10330409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"KIF3A forms a heterotrimeric KIF3 complex with KIF3B (or KIF3C) and KAP3; the complex is ubiquitously expressed but predominantly in neural tissues.\",\n      \"method\": \"Immunoprecipitation from mouse brain, co-purification\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunoprecipitation confirming trimeric complex, replicated from prior work\",\n      \"pmids\": [\"10330409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GADD34 interacts with the tail domain of KIF3A; this interaction was identified by yeast two-hybrid screening and confirmed by in vivo two-hybrid analysis in NIH3T3 cells.\",\n      \"method\": \"Yeast two-hybrid, in vivo two-hybrid assay in mammalian cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, yeast two-hybrid only with in vivo confirmation but no functional follow-up\",\n      \"pmids\": [\"10631107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The neck-hinge region of KIF3A (residues 356-416) contains a predicted coiled-coil (residues 356-377) that folds autonomously in solution; electrostatic attractions between oppositely charged unstructured regions drive specificity of heterodimerization of the KIF3A coiled-coil, without affecting stability relative to the most stable homodimer.\",\n      \"method\": \"Circular dichroism spectroscopy, redox disulfide exchange experiments, urea denaturation studies of synthetic peptide analogs\",\n      \"journal\": \"Journal of structural biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biophysical reconstitution with multiple analogs and mutagenesis-equivalent approaches, single lab\",\n      \"pmids\": [\"12064947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Kidney-specific inactivation of KIF3A abolishes primary cilia on renal tubular epithelial cells and produces polycystic kidney disease; cyst epithelial cells show increased proliferation and apoptosis, apical mislocalization of EGF receptor, increased β-catenin and c-Myc expression, and inhibition of p21CIP1.\",\n      \"method\": \"Conditional knockout (Cre-lox) in kidney epithelia, histology, immunofluorescence, Western blot\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific conditional knockout with detailed molecular phenotyping, multiple orthogonal readouts\",\n      \"pmids\": [\"12672950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Loss of KIF3A in rod photoreceptors (via synchronous Cre-mediated excision) causes ectopic accumulation of opsin before photoreceptor degeneration, with normal cilium and disc membrane formation initially; this establishes opsin as a primary KIF3A-dependent cargo in photoreceptor cells.\",\n      \"method\": \"Conditional knockout (RHO-Cre;Kif3a-flox), Western blot time course, immunofluorescence, histology\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — synchronous excision allowing precise temporal dissection, multiple timepoints, clean identification of ectopic opsin as primary lesion\",\n      \"pmids\": [\"17065525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Kif3a loss restrains canonical Wnt/β-catenin signaling through two mechanisms: (1) a ciliary mechanism shared with other ciliogenic gene mutations (Ift88, Ofd1) that normally restricts Wnt pathway activity, and (2) a non-ciliary mechanism specific to Kif3a loss, involving constitutive CKI-dependent phosphorylation of Dishevelled (Dvl); pharmacological inhibition of casein kinase I reverses constitutive Dvl phosphorylation and abrogates pathway hyper-responsiveness.\",\n      \"method\": \"Conditional knockout mouse embryos and primary fibroblasts, phosphorylation assays, CKI inhibitor treatment, genetic comparison of three ciliogenic mutations\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three separate ciliogenic mutations compared, CKI inhibitor rescue, multiple cell types, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"18084282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KIF3A and KIF3B kinesins regulate MT1-MMP-positive vesicle transport bidirectionally along microtubules in primary human macrophages; siRNA knockdown of KIF3A/KIF3B impairs MT1-MMP delivery to the cell surface, shedding of CD44 and syndecan-1, and ECM degradation at podosomes.\",\n      \"method\": \"siRNA knockdown, live-cell imaging of MT1-MMP vesicles, flow cytometry, ECM degradation assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging plus functional readouts in primary cells, single lab\",\n      \"pmids\": [\"20505159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Kif3a regulates planar polarization of auditory hair cells through both ciliary mechanisms (kinocilium formation) and non-ciliary mechanisms; the non-ciliary function involves Kif3a-regulated localized cortical activity of PAK kinases, which controls basal body positioning along the apicobasal and planar polarity axes.\",\n      \"method\": \"Conditional knockout in inner ear, immunofluorescence of PAK activity/localization, basal body positioning analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockout with PAK activity readout distinguishing ciliary vs. non-ciliary mechanisms, single lab\",\n      \"pmids\": [\"21752934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RNF33/TRIM60 interacts with KIF3A and KIF3B via its RB and B30.2 domains binding to the respective C-terminal non-motor tail domains; this interaction is independent of the KAP3 adaptor, leaving the motor head section free for cargo binding.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, deletion mapping\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, yeast two-hybrid with co-IP confirmation, but no functional follow-up on cargo transport\",\n      \"pmids\": [\"21909995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The Axin/TNKS2 complex interacts with KIF3A to form a ternary complex required for insulin-stimulated GLUT4 translocation to the plasma membrane; in the absence of insulin, Axin/TNKS2/KIF3A co-localize with GLUT4 on the trans-Golgi network; insulin suppresses TNKS ADP-ribosylase activity, stabilizing the complex via Akt; specific knockdown of each component attenuates GLUT4 translocation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, co-localization imaging, glucose uptake assays, TNKS2 knockout mice\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus genetic (KO mouse) and pharmacological (Akt inhibitor) epistasis, single lab\",\n      \"pmids\": [\"22473005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"KIF3A is required for spermatid elongation, sperm tail formation, and manchette function; depletion of KIF3A causes severe impairments in sperm tail formation and affects manchette organization and nuclear shaping; several novel interacting partners were identified including MNS1, which co-localizes with KIF3A in the manchette and principal piece.\",\n      \"method\": \"Conditional knockout, co-immunoprecipitation/interactor identification, immunofluorescence co-localization\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO phenotype plus interactor identification by co-IP, single lab\",\n      \"pmids\": [\"23831641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Kif3a depletion in MDCK cells slows epithelial cell migration, dampens microtubule dynamics at the leading edge (microtubules fail to grow perpendicularly into the leading edge), retards lateral membrane specification, and completely prevents formation of 3D lumen-containing spheres in collagen; these are extra-ciliary functions.\",\n      \"method\": \"Tetracycline-inducible Kif3a knockdown, live-cell microtubule dynamics imaging, wound-healing migration assay, 3D collagen sphere assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible depletion with live imaging and multiple functional readouts, single lab\",\n      \"pmids\": [\"23658710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KIF3A processivity is controlled by rear head gating rather than front head gating: rearward strain in the two-head-bound state does not alter nucleotide binding to the front head (no front-head gating), but the motor dissociates slowly from the low-affinity ADP state (rear head gating); the KIF3A/B heterodimer shows load-dependent properties intermediate between the two homodimers, attributable to motor domain properties rather than neck linkers or coiled-coil stalk.\",\n      \"method\": \"Stopped-flow and steady-state kinetics, single-molecule motility assays, optical trap with feedback control, multimotor assays, AMP-PNP trapping, neck-linker length mutants\",\n      \"journal\": \"The Journal of biological chemistry / Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — two independent papers (PMID 25657001, 25866395) using reconstituted motors with multiple biophysical methods including optical trapping and kinetics\",\n      \"pmids\": [\"25657001\", \"25866395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PKA and CaMKIIα phosphorylate the C-terminus of KIF3A to regulate activity-dependent loading of N-cadherin cargo; phosphorylation of the KIF3A C-terminal domain increases N-cadherin transport to dendritic spines, and this transport is enhanced during homeostatic synaptic upregulation (TTX treatment); mutagenesis of the phosphosites abrogates activity-dependent N-cadherin transport.\",\n      \"method\": \"Quantitative phosphoproteomics of KIF3A-bound vs. unbound cargo vesicles, site-directed mutagenesis, kinase inhibitors, live-cell N-cadherin transport imaging, TTX-induced homeostatic plasticity\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — phosphoproteomics identifies sites, mutagenesis confirms function, live imaging of transport, kinase inhibitor validation; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"26335646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HSV-1 viral kinase US3 phosphorylates KIF3A predominantly at serine 687, both in vitro and in infected cells; this phosphorylation is required for US3-mediated downregulation of CD1d cell surface expression; ablation of the S687 phosphorylation site abolishes US3-mediated CD1d downregulation.\",\n      \"method\": \"Mass spectrometry of purified KIF3A, in vitro kinase assay, phosphosite mutagenesis (S687A), CD1d surface expression assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay, mass spectrometry site identification, phosphosite mutagenesis with functional rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"25878107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KIF3A binds β-arrestin; in NSCLC cells KIF3A depletion allows β-arrestin to form a complex with DVL2 and Axin, thereby stabilizing β-catenin and activating Wnt signaling independently of primary cilia; pharmacological inhibition of ciliogenesis did not increase β-catenin activity, confirming a non-ciliary mechanism.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation of KIF3A-β-arrestin, β-catenin reporter assays, pharmacological ciliogenesis inhibition\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of KIF3A-β-arrestin interaction plus pharmacological and genetic dissection of ciliary vs. non-ciliary pathway, single lab\",\n      \"pmids\": [\"27596264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KIF3A and KIF13A coordinate to transport the same MT1-MMP-containing vesicles from the trans-Golgi to endosomes, while KIF13A alone transports vesicles from endosomes to the plasma membrane; knockdown of KIF3A and KIF13A inhibits MT1-MMP-dependent collagen degradation and cancer cell invasion.\",\n      \"method\": \"siRNA knockdown, live-cell imaging of MT1-MMP vesicles, collagen degradation assay, invasion assay\",\n      \"journal\": \"Matrix biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging plus functional knockdown assays distinguishing KIF3A and KIF13A roles in sequential transport steps, single lab\",\n      \"pmids\": [\"35122963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KIF3A directly binds Disabled-1 (Dab1) via the cargo-binding domain (CBD) at its C-terminus; the PTB domain-containing region of Dab1 is essential for KIF3A binding; this interaction is specific to KIF3A (not KIF3B, KIF5B, KIF17, or KAP3); KIF3A dominant-negative expression reduces ApoER2 cell surface expression, suggesting KIF3A transports ApoER2 to the cell surface.\",\n      \"method\": \"Yeast two-hybrid screen, GST pulldown, co-immunoprecipitation in HEK-293T cells, immunofluorescence co-localization, dominant-negative expression assay for ApoER2 surface expression\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by GST pulldown and reciprocal co-IP with functional readout, single lab\",\n      \"pmids\": [\"38919020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KIF3A tail domain phosphorylation is dispensable for ciliogenesis in mammalian mouse embryonic fibroblasts; a library of phosphomimetic mutants covering all predicted phosphosites in the KIF3A tail domain rescued ciliogenesis normally in Kif3a-/-;Kif3b-/- MEFs, contrasting with the previously proposed requirement for phosphorylation in IFT regulation.\",\n      \"method\": \"Kif3a-/-;Kif3b-/- MEF ciliogenesis rescue assay with library of phosphomimetic KIF3A tail mutants\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis of all predicted phosphosites in clean double-KO rescue assay, single lab; this is a negative finding that contradicts prior reports\",\n      \"pmids\": [\"38405607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KIF3A (within the KIF3A/KIF3B/KAP3 heterotrimer) is autoinhibited via a conserved beta-hairpin motif in the kinesin-2 tail domain that sequesters motor domains away from microtubules through molecular mimicry; KAP3 binds via a multipartite interface with KIF3A and KIF3B and provides a platform for cargo adaptor engagement that occludes the beta-hairpin, thereby activating motility; the APC cargo adaptor engages this platform to relieve autoinhibition.\",\n      \"method\": \"Cryo-EM structural determination, single-molecule motility assays, cell biological assays, mutagenesis of beta-hairpin motif\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure plus single-molecule assays and mutagenesis in one study; preprint but comprehensive mechanistic data\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"High-resolution cryo-EM structures of the KIF3A/KIF3B/KAP3 complex bound to APC cargo reveal a 'Hitchdock domain' in the KIF3 tail that mediates interactions with both KAP3 adaptor and APC cargo; KIF3A helical regions within the Hitchdock domain mediate specific cargo binding, while the beta-hairpin region and KIF3B provide structural support; mutagenesis and molecular dynamics simulations confirm the domain's functional importance.\",\n      \"method\": \"Cryo-EM structure determination, site-directed mutagenesis, molecular dynamics simulations\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution cryo-EM structure with mutagenesis and MD validation; preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KIF3A associates with KIFC1 to regulate expression and polar localization of NuMA and γ-tubulin during mouse oocyte meiosis; KIF3A depletion activates the spindle assembly checkpoint leading to metaphase I arrest; KIF3A also reduces microtubule stability through altered deacetylation by HDAC6; KIF3A is required for proper organelle (mitochondria, Golgi, ER) distribution in oocytes.\",\n      \"method\": \"KIF3A depletion (siRNA/morpholino), LC-MS interactome analysis, immunofluorescence, spindle assembly checkpoint markers, HDAC6 activity assay, mRNA rescue\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — depletion plus mRNA rescue with LC-MS interactome and multiple functional readouts, single lab\",\n      \"pmids\": [\"38587639\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KIF3A is the motor subunit of the heterotrimeric kinesin-2 complex (KIF3A/KIF3B/KAP3) that drives anterograde, plus end-directed transport of membrane organelles, ciliary/flagellar components (via intraflagellar transport), and specific cargoes including opsin, N-cadherin, MT1-MMP vesicles, GLUT4, CD1d, and ApoER2 along microtubules; its motor activity is regulated by autoinhibition through a beta-hairpin motif in the tail domain that is relieved upon KAP3 and cargo adaptor (e.g., APC) binding, and by phosphorylation of the C-terminal tail domain by PKA and CaMKIIα for activity-dependent cargo loading; additionally, KIF3A exerts non-ciliary signaling functions by restraining canonical Wnt/β-catenin signaling through sequestration of β-arrestin and by promoting CKI-dependent Dishevelled phosphorylation, while its role in ciliogenesis is essential for hedgehog signal transduction and establishment of left-right asymmetry.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KIF3A is the motor subunit of the heterotrimeric kinesin-2 complex that drives microtubule plus end-directed (anterograde) transport of membrane organelles and ciliary cargo [#1, #2]. It functions as a plus end-directed motor both as a recombinant heavy chain and as a heterodimer with KIF3B that forms a ~50 nm rod with two motor heads and a single tail, which associates with membranous organelles [#1, #2]; addition of the non-motor adaptor KAP3 to the KIF3A/B tail produces the heterotrimeric KIF3 complex and couples the motor to membrane cargo without altering intrinsic motor activity [#3, #10], and KIF3A can substitute KIF3C for KIF3B to form distinct neuronal motors [#6]. The motor is held inactive by an autoinhibitory beta-hairpin motif in the kinesin-2 tail that mimics microtubule binding; KAP3 binding provides a multipartite cargo-adaptor platform — engaged through a tail 'Hitchdock domain' — that occludes the beta-hairpin and is relieved by adaptors such as APC to license motility [#29, #30]. Mechanistically the heterodimer is processive through rear-head gating, with load-dependent properties intermediate between the homodimers and set by the motor domains [#22]. Functionally, KIF3A is the ancestral intraflagellar transport motor required for flagellar/ciliary assembly from Chlamydomonas to mammals: it localizes between axonemal doublets and the ciliary membrane, drives IFT particle movement, and is needed for inner dynein arm delivery to the distal axoneme [#0, #4, #9]; loss of KIF3A ablates nodal cilia and randomizes left-right asymmetry, and kidney-specific loss removes primary cilia and produces polycystic kidney disease with elevated beta-catenin and c-Myc [#9, #13]. As a transport motor it delivers specific cargoes including opsin in photoreceptors [#14], N-cadherin to dendritic spines under activity-dependent control [#23], MT1-MMP vesicles for matrix degradation and invasion [#16, #26], GLUT4 with the Axin/TNKS2 complex during insulin signaling [#19], and ApoER2 via direct binding to Dab1 [#27]. Beyond cilia, KIF3A restrains canonical Wnt/beta-catenin signaling through a non-ciliary mechanism involving constitutive CKI-dependent Dishevelled phosphorylation and sequestration of beta-arrestin from a DVL2/Axin complex [#15, #25]. The KIF3A C-terminal tail is a phosphoregulatory hub: PKA and CaMKIIalpha phosphorylation regulates cargo loading [#23] and HSV-1 kinase US3 phosphorylates Ser687 to downregulate CD1d [#24], although systematic phosphomimetic analysis shows tail phosphorylation is dispensable for ciliogenesis itself [#28]. KIF3A additionally contributes to epithelial migration and lumen morphogenesis [#21] and to spindle and organelle organization in oocyte meiosis [#31].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established the founding function of KIF3A as the motor required for intraflagellar transport and flagellar assembly, defining its ancestral role before any vertebrate work.\",\n      \"evidence\": \"Temperature-sensitive FLA10/KHP1 mutant analysis with IFT particle imaging and immunolocalization in Chlamydomonas\",\n      \"pmids\": [\"8522608\", \"8027176\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular cargo carried by IFT\", \"Motor directionality not directly demonstrated in this organism\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Defined KIF3A as a plus end-directed (anterograde) microtubule motor associated with membrane organelles, settling its directionality and transport role.\",\n      \"evidence\": \"In vitro microtubule gliding with baculovirus-expressed KIF3A, nerve ligation accumulation, and fractionation in neurons\",\n      \"pmids\": [\"7515068\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional cargo identity unresolved\", \"Subunit composition of the native motor not yet established\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Showed KIF3A operates as a heterodimer with KIF3B, establishing the obligate two-headed motor architecture.\",\n      \"evidence\": \"Baculovirus reconstitution, IP, in vitro sliding assay and EM of the recombinant KIF3A/B rod\",\n      \"pmids\": [\"7559760\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the cargo-coupling adaptor\", \"Regulation of motor activity not addressed\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Identified KAP3 as the third subunit binding the KIF3A/B tail, completing the heterotrimer and implicating it in membrane organelle coupling.\",\n      \"evidence\": \"Sf9 reconstitution, fractional IP, and EM domain mapping\",\n      \"pmids\": [\"8710890\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How KAP3 selects specific cargo not defined\", \"Mechanism of activity regulation by KAP3 not resolved\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Refined the IFT role by showing FLA10/KHP1 is specifically required to deliver inner (not outer) dynein arms to the distal axoneme, and localized the motor through the cell cycle.\",\n      \"evidence\": \"Dikaryon rescue epistasis with dynein arm markers; immunolocalization and motor-domain mutation sequencing in Chlamydomonas\",\n      \"pmids\": [\"8609169\", \"8907700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo selectivity mechanism for dynein arms unknown\", \"Mitotic spindle association function not functionally tested\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Expanded the motor repertoire by showing KIF3A can pair with KIF3C to form a distinct neuronal motor on a separate vesicle population.\",\n      \"evidence\": \"Reciprocal co-IP and sucrose gradient fractionation in neurons\",\n      \"pmids\": [\"9487132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Distinct cargo of the KIF3A/C motor not identified\", \"Functional difference from KIF3A/B not established\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Proposed a nuclear, condensin-linked role for the complex via KAP3-HCAP interaction.\",\n      \"evidence\": \"Yeast two-hybrid and nuclear-fraction co-IP\",\n      \"pmids\": [\"9506951\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Functional significance not directly tested\", \"Single co-IP from nuclear fraction without reciprocal in vivo validation\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrated that the Chlamydomonas IFT function is conserved in mammals and essential for embryonic ciliogenesis and left-right asymmetry.\",\n      \"evidence\": \"Kif3a knockout mice with node SEM and in situ hybridization of L-R markers; brain IP confirming the heterotrimer\",\n      \"pmids\": [\"10220415\", \"10330409\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo transported into nodal cilia not identified\", \"Mechanism linking cilia to asymmetric gene expression not resolved here\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Revealed dual subcellular roles of KIF3A within a single cell type by localizing it to both the photoreceptor connecting cilium and the presynaptic ribbon.\",\n      \"evidence\": \"ImmunoEM and fractionation in vertebrate photoreceptors\",\n      \"pmids\": [\"9920666\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Synaptic ribbon function of KIF3A not functionally tested\", \"Cargo at the ribbon unidentified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Explained heterodimerization specificity at the biophysical level, showing electrostatic complementarity of unstructured neck-hinge regions drives selective pairing.\",\n      \"evidence\": \"CD spectroscopy, redox exchange, and urea denaturation of KIF3A coiled-coil peptide analogs\",\n      \"pmids\": [\"12064947\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Behavior of full-length proteins not tested\", \"Relevance to motor regulation not addressed\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Linked KIF3A-dependent ciliogenesis to disease and downstream signaling by showing renal cilium loss causes polycystic kidney disease with altered beta-catenin signaling.\",\n      \"evidence\": \"Kidney-specific conditional knockout with histology and molecular phenotyping\",\n      \"pmids\": [\"12672950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether signaling changes are cilium-dependent or independent not separated here\", \"Direct cargo underlying cyst phenotype unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified opsin as a primary KIF3A-dependent transport cargo, distinguishing a transport defect from structural cilium failure.\",\n      \"evidence\": \"Synchronous RHO-Cre conditional knockout with Western time course and immunofluorescence\",\n      \"pmids\": [\"17065525\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor coupling opsin to KIF3A not defined\", \"Other photoreceptor cargoes not enumerated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Distinguished ciliary from non-ciliary regulation of Wnt signaling, showing KIF3A restrains the pathway in part through CKI-dependent Dishevelled phosphorylation independent of cilia.\",\n      \"evidence\": \"Conditional KO embryos/fibroblasts, phosphorylation assays, CKI inhibitor rescue, comparison of three ciliogenic mutations\",\n      \"pmids\": [\"18084282\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular intermediary linking KIF3A to CKI activity unknown\", \"Whether motor activity is required for the non-ciliary effect untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended cargo range to MT1-MMP vesicles, connecting KIF3A to surface protease delivery and ECM degradation in macrophages.\",\n      \"evidence\": \"siRNA knockdown, live vesicle imaging, flow cytometry, ECM degradation assay\",\n      \"pmids\": [\"20505159\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct cargo adaptor not identified\", \"Single cell type tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed KIF3A controls planar polarity through both cilia and a non-ciliary route involving cortical PAK activity and basal body positioning.\",\n      \"evidence\": \"Inner-ear conditional knockout with PAK activity/localization and basal body analysis\",\n      \"pmids\": [\"21752934\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How KIF3A regulates cortical PAK not defined\", \"Direct vs. indirect effect on basal body unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Added RNF33/TRIM60 as a tail-binding partner engaging KIF3A independently of KAP3.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, deletion mapping\",\n      \"pmids\": [\"21909995\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No functional follow-up on cargo transport\", \"Single lab without reciprocal in vivo validation\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed KIF3A in insulin-regulated GLUT4 trafficking via an Axin/TNKS2 ternary complex.\",\n      \"evidence\": \"Reciprocal co-IP, siRNA knockdown, co-localization, glucose uptake, and TNKS2 knockout mice\",\n      \"pmids\": [\"22473005\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GLUT4-KIF3A contact not demonstrated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established extra-ciliary roles in spermatid morphogenesis and in epithelial migration, microtubule dynamics, and lumen formation.\",\n      \"evidence\": \"Conditional KO with interactor co-IP in sperm; inducible knockdown with live MT imaging, migration and 3D collagen assays in MDCK\",\n      \"pmids\": [\"23831641\", \"23658710\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking KIF3A to leading-edge MT dynamics unknown\", \"MNS1 interaction function not dissected\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved the motility mechanism, showing KIF3A processivity is governed by rear-head gating and that heterodimer load behavior derives from the motor domains.\",\n      \"evidence\": \"Stopped-flow kinetics, single-molecule and optical-trap assays, neck-linker mutants on reconstituted motors\",\n      \"pmids\": [\"25657001\", \"25866395\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address tail autoinhibition in this regulation\", \"In vivo relevance of gating differences not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the KIF3A C-terminal tail as a phosphoregulatory hub controlling cargo loading and exploited by a viral kinase.\",\n      \"evidence\": \"Phosphoproteomics, phosphosite mutagenesis, kinase inhibitors and live transport imaging for N-cadherin; MS, in vitro kinase and S687A mutagenesis for US3/CD1d\",\n      \"pmids\": [\"26335646\", \"25878107\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phosphorylation structurally alters cargo loading not resolved\", \"Generality of phospho-control across cargoes unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the molecular basis of non-ciliary Wnt restraint, showing KIF3A sequesters beta-arrestin from a DVL2/Axin complex to limit beta-catenin stabilization.\",\n      \"evidence\": \"siRNA knockdown, KIF3A-beta-arrestin co-IP, beta-catenin reporter, pharmacological ciliogenesis inhibition in NSCLC cells\",\n      \"pmids\": [\"27596264\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct beta-arrestin binding interface not mapped\", \"Relationship to the CKI/Dvl mechanism not integrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Refined MT1-MMP trafficking into sequential steps, with KIF3A and KIF13A handling Golgi-to-endosome transport relevant to cancer invasion.\",\n      \"evidence\": \"siRNA knockdown, live vesicle imaging, collagen degradation and invasion assays\",\n      \"pmids\": [\"35122963\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Switching mechanism between the two motors unknown\", \"Adaptor coupling KIF3A to these vesicles undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified Dab1 as a direct, KIF3A-specific cargo adaptor linking the motor to ApoER2 surface delivery.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown, co-IP, co-localization and dominant-negative ApoER2 surface assay\",\n      \"pmids\": [\"38919020\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo requirement not tested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Challenged the requirement of tail phosphorylation for ciliogenesis, showing phosphomimetic tail mutants rescue cilia in double-knockout cells.\",\n      \"evidence\": \"Phosphomimetic mutant library rescue in Kif3a-/-;Kif3b-/- MEFs\",\n      \"pmids\": [\"38405607\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not exclude phospho-control of non-ciliary cargo loading\", \"Single lab negative finding\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Added a meiotic role, implicating KIF3A in spindle pole protein localization, microtubule stability via HDAC6, and organelle distribution in oocytes.\",\n      \"evidence\": \"Depletion with mRNA rescue, LC-MS interactome, SAC markers, HDAC6 activity assay\",\n      \"pmids\": [\"38587639\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect effect on NuMA/gamma-tubulin unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided the structural mechanism of autoinhibition and cargo-mediated activation, defining a tail beta-hairpin that mimics microtubule binding and a KAP3/APC cargo platform that relieves it.\",\n      \"evidence\": \"Cryo-EM of the KIF3A/B/KAP3 complex with APC, single-molecule motility, mutagenesis and MD simulations (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Peer review pending (preprint)\", \"Whether all cargoes activate via the same Hitchdock platform unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How distinct cargo adaptors achieve selectivity and how phosphorylation, autoinhibition, and KAP3-mediated activation are coordinated across the many KIF3A cargoes and tissues remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Unified model linking tail phospho-state to autoinhibition release not established\", \"Cargo-specific adaptor codes incompletely mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [1, 2, 22]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 2, 22]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [22]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [23, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 8, 9, 13]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [5, 9, 31]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 2, 21]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2, 16, 19, 26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 4, 9, 13]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2, 16, 26]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [14, 19, 27]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [15, 25]}\n    ],\n    \"complexes\": [\n      \"kinesin-2 (KIF3A/KIF3B/KAP3)\",\n      \"KIF3A/KIF3C heterodimer\",\n      \"Axin/TNKS2/KIF3A complex\"\n    ],\n    \"partners\": [\n      \"KIF3B\",\n      \"KIF3C\",\n      \"KAP3\",\n      \"APC\",\n      \"Dab1\",\n      \"beta-arrestin\",\n      \"KIF13A\",\n      \"MNS1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}