{"gene":"KIF7","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2009,"finding":"Kif7 is a cilia-associated protein that acts downstream of Smoothened (Smo) and upstream of Gli2/Gli3 transcription factors in mammalian Hedgehog signaling; in the absence of Shh it localizes to the base of the primary cilium, and Shh activation promotes trafficking of Kif7-eGFP to the cilium tip in a motor-domain-dependent manner.","method":"Genetic screen (reporter-based mutant allele), eGFP-tagged Kif7 live imaging in mouse embryo cells, motor domain mutant analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and live-imaging evidence, motor domain mutant, independently replicated across multiple labs in the same year","pmids":["19666503"],"is_preprint":false},{"year":2009,"finding":"Kif7 physically interacts with Gli transcription factors, controls their proteolysis and stability, and acts both positively and negatively in Hedgehog signaling, paralleling the role of Drosophila Costal2.","method":"Co-immunoprecipitation of Kif7 with Gli proteins; Kif7 knockout mice with Gli processing readouts","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct physical interaction by Co-IP plus in vivo knockout with defined molecular phenotype; replicated across multiple studies","pmids":["19549984"],"is_preprint":false},{"year":2009,"finding":"Kif7 accumulates at the distal tip of primary cilia in a Hedgehog-dependent manner and is required for efficient localization of Gli3 to cilia and for processing of Gli3 into its repressor form.","method":"Kif7 knockout mouse; immunofluorescence of Gli3 in cilia; immunoblot of Gli3 processing","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with multiple orthogonal readouts (localization, processing); replicated by other labs","pmids":["19592253"],"is_preprint":false},{"year":2011,"finding":"Kif7 promotes Hedgehog pathway activity by restricting the inhibitory function of Sufu: Kif7 plays a role in Sufu turnover and exclusion of Sufu-Gli complexes from the primary cilium; genetic rescue by halving Sufu dose restores normal pathway activity in Kif7-null chondrocytes.","method":"Conditional knockout mice; epistasis (Kif7-null × Sufu heterozygous cross); immunofluorescence of Sufu-Gli complexes in cilia","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis with rescue experiment plus localization assay","pmids":["21795282"],"is_preprint":false},{"year":2011,"finding":"KIF7 co-precipitates with nephrocystin-1 (NPHP1); knockdown of KIF7 causes defects in cilia formation, abnormal centrosomal duplication, and fragmentation of the Golgi network, linked to abnormal tubulin acetylation and microtubule dynamics.","method":"Co-immunoprecipitation of KIF7 with nephrocystin-1; siRNA knockdown in cell lines; immunofluorescence of cilia, centrosomes, and Golgi; tubulin acetylation assay","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus knockdown with multiple cellular phenotype readouts, single lab","pmids":["21633164"],"is_preprint":false},{"year":2011,"finding":"KIF7 mutations cause deregulation of GLI transcription factor targets and impaired GLI3 processing in human patient tissues, establishing KIF7 as a regulator of GLI3 processing in human primary cilia.","method":"Patient tissue analysis; immunoblot of GLI3 processing; sequencing of KIF7 in ciliopathy cohorts; in vivo genetic interaction (zebrafish knockdown epistasis)","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient tissue biochemistry plus in vivo genetic interaction studies, replicated across multiple patient cohorts","pmids":["21552264"],"is_preprint":false},{"year":2012,"finding":"Sufu restricts Gli2 activity through cytoplasmic sequestration; Kif7 possesses both Sufu-dependent functions (promoting dissociation of Sufu-Gli2 complex) and Sufu-independent repressive functions in Hh signaling in keratinocytes; simultaneous deletion of both Sufu and Kif7 in embryonic skin abolishes follicular fate.","method":"Conditional knockout mice (skin-specific); double-knockout epistasis; localization assays for Sufu-Gli2 complexes","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean in vivo genetic epistasis with double-mutant phenotype readouts and defined mechanistic distinction","pmids":["23034632"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of the human Kif7 motor domain was determined at high resolution, revealing structural features shared with and distinct from conventional kinesin.","method":"X-ray crystallography of recombinant human Kif7 motor domain","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure of recombinant protein, single study but direct structural determination","pmids":["22281744"],"is_preprint":false},{"year":2013,"finding":"Kif7 interacts with Gli1 and Gli2a in zebrafish, sequesters Gli proteins in cytoplasmic puncta, promotes Gli2a dissociation from Sufu, and mediates a Smoothened-dependent modification of full-length Gli2a; cytoplasmic Kif7 puncta disperse in response to Hh pathway activation. Drosophila Costal2 can substitute for Kif7 in zebrafish.","method":"Zinc finger nuclease-induced kif7 mutant alleles; co-immunoprecipitation of Kif7 with Gli1 and Gli2a; immunofluorescence of cytoplasmic Kif7 puncta; rescue with Drosophila Cos2","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — endogenous mutant alleles, Co-IP, localization, cross-species functional rescue, multiple methods in one study","pmids":["24339784"],"is_preprint":false},{"year":2014,"finding":"Kif7 localizes to the cilium tip where it binds the plus ends of growing microtubules, reduces the rate of microtubule growth, and increases the frequency of microtubule catastrophe; this activity limits cilium length and controls cilium architecture, creating a single cilium tip compartment where Gli-Sufu activity is regulated. Kif7 is not required for intraflagellar transport or trafficking of Hh pathway proteins into cilia.","method":"In vitro TIRF microscopy of purified recombinant Kif7 on growing microtubules; mouse Kif7 mutant analysis; live-cell imaging of cilia","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified protein in vitro reconstitution assay plus mutant mouse phenotype, multiple orthogonal methods, widely replicated","pmids":["24952464"],"is_preprint":false},{"year":2014,"finding":"Liprin-α1 (PPFIA1) and the protein phosphatase PP2A were identified as Kif7-interacting proteins by mass spectrometry; PPFIA1 and PP2A promote dephosphorylation of Kif7, triggering Kif7 localization to ciliary tips and promoting Gli transcriptional activity.","method":"Affinity purification–mass spectrometry (AP-MS) of Kif7; co-immunoprecipitation validation; phosphorylation assays; functional rescue experiments","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Moderate — AP-MS plus Co-IP validation plus phosphorylation assay plus functional consequence, single lab, multiple orthogonal methods","pmids":["25492966"],"is_preprint":false},{"year":2016,"finding":"UBR3, an E3 ubiquitin ligase, poly-ubiquitinates Kif7 (mammalian homologue of Cos2), leading to its degradation; loss of UBR3 upregulates Kif7 protein levels and decreases Hh signaling in cultured cells.","method":"In vitro ubiquitination assay with mouse UBR3 and Kif7; Western blot of Kif7 levels upon UBR3 knockdown; Hh signaling readout","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro ubiquitination assay plus cellular knockdown with defined molecular phenotype, single lab","pmids":["27195754"],"is_preprint":false},{"year":2018,"finding":"KIF7 (and its Drosophila homologue Costal2) is immotile because it cannot release ADP in response to microtubule binding (defective mechanochemical coupling), enabling it to function as a microtubule-based tether of signaling complexes rather than a transporter.","method":"In vitro single-molecule motility assays; ATPase kinetics; ADP release assays; comparison of kinesin-4 family members","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro biochemical assays (ATPase, motility, ADP release) with mechanistic dissection, comparison across family members","pmids":["29351996"],"is_preprint":false},{"year":2019,"finding":"Decreased GLI3R signaling is fully responsible for acrocallosal syndrome features in Kif7-null mice (rescued by crossing with Gli3Δ699 mice producing only GLI3R); increased FGF8 signaling is responsible in part for corpus callosum defects associated with KIF7 depletion.","method":"Kif7-null × Gli3Δ699 genetic rescue experiment; crossing with FGF8 signaling modifiers; cortical patterning analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis with rescue experiment defining pathway hierarchy, multiple genetic cross combinations","pmids":["30445565"],"is_preprint":false},{"year":2021,"finding":"KIF7 is regulated by auto-inhibition mediated by an inhibitory coiled-coil (inhCC) segment; disease-associated mutations in the inhCC relieve auto-inhibition and result in strong microtubule binding. Uninhibited KIF7 binds along cytosolic and axonemal microtubules rather than preferentially at plus ends in cells. Localization to the cilium tip also requires the inhCC.","method":"Microtubule binding assays in cells; mutagenesis of inhCC; disease-associated mutant analysis; live-cell imaging","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus microtubule binding assay plus live-cell imaging with disease-associated alleles, multiple orthogonal methods","pmids":["34114033"],"is_preprint":false},{"year":2021,"finding":"KIF7's microtubule binding is not required for Hedgehog-induced increase in KIF7 or Gli localization at the cilium tip; instead, kinesin-2 KIF3A/KIF3B/KAP (intraflagellar transport) mediates translocation of KIF7 to the cilium tip in response to Hh pathway activation. The immotile behavior of KIF7 is required to prevent ciliary localization of Gli transcription factors in the absence of Hh signaling.","method":"KIF7 microtubule-binding and motility variants; acute inhibition of intraflagellar transport via engineered kinesin-2 motor; Gli localization assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — engineered acute transport inhibition plus KIF7 variant panel plus Gli localization, multiple orthogonal approaches in one study","pmids":["34705483"],"is_preprint":false},{"year":2021,"finding":"In enteric neural crest cells, Kif7 inhibits Gli2, which in turn positively regulates Ezh2 expression by inhibiting miR124-mediated suppression; Ezh2 controls differentiation of enteric neural crest cells. Neural-crest-specific Kif7 deficiency causes a marked reduction of enteric NOS+ inhibitory neurons and gut motility defects.","method":"Neural-crest-specific Kif7 conditional knockout mice; Gli2 deletion rescue; Ezh2 inhibition rescue; human ENCC differentiation assays","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout, genetic rescue by Gli2 deletion or Ezh2 inhibition, defined cellular phenotype, multiple orthogonal methods","pmids":["34644112"],"is_preprint":false},{"year":2017,"finding":"The KIF7 coiled-coil (CC) domain enhances LKB1 expression and phosphorylation at Ser428, which induces PTEN phosphorylation and consequently blocks AKT phosphorylation at Ser473, attenuating prostate cancer cell proliferation and migration. Downregulation of LKB1 abrogates the anti-tumor effects of KIF7-CC.","method":"Ectopic expression of KIF7-CC domain in prostate cancer cell lines; Western blot of LKB1, pLKB1, PTEN, pAKT; LKB1 siRNA rescue; xenograft in vivo studies","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain dissection (CC vs MD), epistasis via LKB1 knockdown, in vivo xenograft, single lab","pmids":["28903364"],"is_preprint":false},{"year":2013,"finding":"The ADPRT domain (residues 234-354) of Pseudomonas aeruginosa ExoS toxin binds to the N-terminal domain (residues 1-109) of KIF7, and silencing KIF7 expression causes cytotoxicity in human bronchial epithelial cells, suggesting ExoS can induce cytotoxicity by interacting with KIF7.","method":"Yeast two-hybrid screen; pull-down assay; KIF7 siRNA knockdown with cytotoxicity readout","journal":"Journal of infection and chemotherapy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid and single pull-down with partial domain constructs, single lab, indirect cytotoxicity readout","pmids":["24462444"],"is_preprint":false},{"year":2024,"finding":"KIF7 is critical for the temporal control of Gli2 transport by IFT machinery and for spatial control of Gli2 localization at the cilium tip; IFT transports GLI2 with anterograde bias during a restricted time window following Hh pathway activation, and KIF7 coordinates this process.","method":"Real-time single-particle imaging of GLI2 within cilia; KIF7 mutant analysis; IFT machinery perturbation","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single-molecule real-time imaging plus KIF7 mutant analysis, preprint not peer-reviewed, single lab","pmids":[],"is_preprint":true}],"current_model":"KIF7 is an immotile kinesin-4 family protein that localizes to the tip of the primary cilium (trafficked there by IFT/KIF3A-KIF3B-KAP upon Hedgehog activation) where it binds microtubule plus ends, reduces microtubule growth rate, increases catastrophe frequency, and organizes the ciliary tip compartment; its immotility arises from inability to release ADP upon microtubule binding; it is regulated by auto-inhibition via an inhibitory coiled-coil domain and by UBR3-mediated poly-ubiquitination and degradation; at the cilium tip it physically interacts with Gli transcription factors and Sufu to coordinate both positive (dissociation of Sufu-Gli complexes) and negative (Gli sequestration/repression) regulation of Hedgehog transcriptional output, with PPFIA1-PP2A-mediated dephosphorylation promoting its ciliary tip trafficking, and the Kif7–Gli–Ezh2 axis governing additional developmental processes such as enteric neural crest cell differentiation."},"narrative":{"mechanistic_narrative":"KIF7 is an immotile kinesin-4 family protein that functions as the core ciliary regulator of mammalian Hedgehog signal transduction, acting downstream of Smoothened and upstream of Gli2/Gli3 transcription factors as the vertebrate counterpart of Drosophila Costal2 [PMID:19666503, PMID:19549984]. In unstimulated cells it resides at the base of the primary cilium, and Hedgehog activation drives its accumulation at the distal ciliary tip, where it is required for efficient Gli3 ciliary localization and processing into the GLI3 repressor form [PMID:19666503, PMID:19592253]. At the cilium tip KIF7 binds the plus ends of growing microtubules, slows microtubule growth and increases catastrophe frequency, thereby limiting cilium length and organizing a single tip compartment in which Gli–Sufu activity is controlled [PMID:24952464]. This regulatory output is bifunctional: KIF7 physically interacts with Gli proteins, sequesters them in cytoplasmic puncta, and both promotes dissociation of Sufu–Gli complexes (a positive, Sufu-dependent activity) and exerts Sufu-independent repressive functions, with halving Sufu dose genetically rescuing Kif7-null phenotypes [PMID:19549984, PMID:21795282, PMID:23034632, PMID:24339784]. Its immotility arises from a failure to release ADP upon microtubule binding, converting it from a transporter into a microtubule-based tether of signaling complexes; this immotile behavior prevents inappropriate ciliary Gli localization without Hedgehog input [PMID:29351996, PMID:34705483]. KIF7 activity is gated by auto-inhibition through an inhibitory coiled-coil whose disease-associated mutations relieve inhibition and cause aberrant microtubule binding [PMID:34114033], by PPFIA1/PP2A-mediated dephosphorylation that triggers ciliary tip trafficking [PMID:25492966], and by UBR3-mediated poly-ubiquitination and degradation [PMID:27195754]; trafficking to the tip itself is executed by the kinesin-2 KIF3A/KIF3B/KAP intraflagellar transport motor [PMID:34705483]. In mouse models, loss of KIF7 produces acrocallosal-syndrome features attributable to decreased GLI3R signaling, and KIF7 mutations deregulate GLI targets and impair GLI3 processing in human ciliopathy patients [PMID:21552264, PMID:30445565]. Beyond canonical Hedgehog control, KIF7 governs enteric neural crest cell differentiation via a Kif7–Gli2–Ezh2 axis [PMID:34644112].","teleology":[{"year":2009,"claim":"Established KIF7 as the missing vertebrate node of cilium-based Hedgehog transduction, placing it downstream of Smoothened and upstream of Gli transcription factors and linking it functionally to Drosophila Costal2.","evidence":"Genetic screen, eGFP-Kif7 live imaging with motor-domain mutants, Co-IP with Gli, and Kif7 knockout mice with Gli processing readouts","pmids":["19666503","19549984","19592253"],"confidence":"High","gaps":["Did not resolve how Hedgehog-dependent tip trafficking is mechanically achieved","Did not distinguish KIF7's positive from negative regulatory activities at the molecular level"]},{"year":2011,"claim":"Defined KIF7 as a regulator of Sufu, showing it restricts Sufu inhibitory function and excludes Sufu-Gli complexes from cilia, with genetic Sufu-dose rescue establishing a direct epistatic relationship.","evidence":"Conditional knockout mice and Kif7-null x Sufu-heterozygous epistasis cross with ciliary localization assays","pmids":["21795282"],"confidence":"High","gaps":["Mechanism of Sufu turnover by KIF7 not defined","Did not separate Sufu-dependent from Sufu-independent KIF7 functions"]},{"year":2011,"claim":"Connected KIF7 to human disease by showing patient mutations deregulate GLI targets and impair GLI3 processing, establishing clinical relevance for the ciliary Hedgehog role.","evidence":"Patient tissue GLI3 immunoblots, KIF7 sequencing in ciliopathy cohorts, and zebrafish knockdown epistasis","pmids":["21552264"],"confidence":"High","gaps":["Did not establish biochemical mechanism by which mutations disrupt processing"]},{"year":2011,"claim":"Implicated KIF7 in broader ciliogenesis and cytoskeletal homeostasis through interaction with nephrocystin-1 and effects on centrosomes, Golgi, and tubulin acetylation.","evidence":"Co-IP with NPHP1 and siRNA knockdown with cilia, centrosome, Golgi, and tubulin acetylation readouts","pmids":["21633164"],"confidence":"Medium","gaps":["Single lab without reciprocal validation","Relationship between NPHP1 interaction and Hedgehog functions unresolved"]},{"year":2012,"claim":"Dissected KIF7's dual nature into Sufu-dependent (Gli dissociation) and Sufu-independent repressive activities, and provided a crystal structure of the motor domain to ground its mechanism.","evidence":"Skin-specific conditional knockouts with Sufu/Kif7 double-mutant epistasis, plus X-ray crystallography of the recombinant human motor domain","pmids":["23034632","22281744"],"confidence":"High","gaps":["Structure did not explain immotility mechanistically","Molecular identity of the Sufu-independent repressive activity unresolved"]},{"year":2013,"claim":"Confirmed cross-species conservation by showing zebrafish Kif7 sequesters Gli in cytoplasmic puncta, mediates a Smoothened-dependent Gli2a modification, and can be functionally replaced by Drosophila Cos2.","evidence":"Zinc-finger-nuclease kif7 mutants, Co-IP with Gli1/Gli2a, puncta imaging, and Cos2 rescue","pmids":["24339784"],"confidence":"High","gaps":["Nature of the Smoothened-dependent Gli2a modification not identified"]},{"year":2014,"claim":"Revealed the biochemical core of KIF7's function: it binds microtubule plus ends to suppress growth and promote catastrophe, building the single ciliary tip compartment where Gli-Sufu is regulated, independent of intraflagellar transport.","evidence":"In vitro TIRF microscopy of purified KIF7 on growing microtubules plus mouse mutant and live-cell cilium imaging","pmids":["24952464"],"confidence":"High","gaps":["Did not explain how an immotile kinesin reaches the tip","Did not define the tip-localization signal"]},{"year":2014,"claim":"Identified post-translational control of KIF7 trafficking, showing PPFIA1/PP2A dephosphorylate KIF7 to trigger ciliary tip localization and Gli activity.","evidence":"AP-MS, Co-IP validation, phosphorylation assays, and functional rescue","pmids":["25492966"],"confidence":"High","gaps":["Kinase opposing this dephosphorylation not identified","Phosphosite mapping incomplete"]},{"year":2016,"claim":"Added degradative control, demonstrating that the E3 ligase UBR3 poly-ubiquitinates KIF7 to limit its abundance and tune Hedgehog output.","evidence":"In vitro ubiquitination assay and UBR3 knockdown with KIF7 protein and Hh readouts","pmids":["27195754"],"confidence":"Medium","gaps":["Single lab without in vivo confirmation","Ubiquitination sites and degradation context not mapped"]},{"year":2018,"claim":"Explained KIF7's defining immotility, showing it cannot release ADP upon microtubule binding and thus acts as a tether rather than a transporter.","evidence":"In vitro single-molecule motility, ATPase kinetics, and ADP-release assays across kinesin-4 members","pmids":["29351996"],"confidence":"High","gaps":["Did not address how the immotile tether is delivered to the cilium tip"]},{"year":2019,"claim":"Defined the pathway hierarchy underlying KIF7 disease phenotypes, attributing acrocallosal-syndrome features to decreased GLI3R and corpus callosum defects partly to increased FGF8 signaling.","evidence":"Kif7-null x Gli3Δ699 genetic rescue and FGF8 modifier crosses with cortical patterning analysis","pmids":["30445565"],"confidence":"High","gaps":["Did not resolve cell-autonomous versus tissue-level contributions"]},{"year":2021,"claim":"Reconciled trafficking and microtubule binding by showing kinesin-2 IFT carries KIF7 to the tip while KIF7 microtubule binding is dispensable for tip accumulation, and that immotility prevents basal ciliary Gli localization.","evidence":"KIF7 microtubule-binding/motility variant panel, acute engineered IFT inhibition, and Gli localization assays","pmids":["34705483"],"confidence":"High","gaps":["How KIF7 cargo recognition by IFT is achieved not defined"]},{"year":2021,"claim":"Identified auto-inhibition via an inhibitory coiled-coil as the conformational switch governing microtubule binding and tip localization, with disease mutations relieving inhibition.","evidence":"inhCC mutagenesis, disease-allele analysis, microtubule-binding and live-cell imaging","pmids":["34114033"],"confidence":"High","gaps":["Signal that physiologically relieves auto-inhibition unresolved"]},{"year":2021,"claim":"Extended KIF7 function beyond canonical patterning to enteric neural crest differentiation through a Kif7-Gli2-Ezh2 axis, with KIF7 loss reducing inhibitory enteric neurons and impairing gut motility.","evidence":"Neural-crest-specific conditional knockout with Gli2-deletion and Ezh2-inhibition rescues and human ENCC differentiation assays","pmids":["34644112"],"confidence":"High","gaps":["miR124-Ezh2 regulatory detail downstream of Gli2 not fully mapped"]},{"year":2017,"claim":"Proposed a Hedgehog-independent tumor-suppressive role in which the KIF7 coiled-coil enhances LKB1 to engage PTEN and suppress AKT in prostate cancer cells.","evidence":"Ectopic KIF7-CC expression with LKB1/PTEN/AKT immunoblots, LKB1 siRNA rescue, and xenografts","pmids":["28903364"],"confidence":"Medium","gaps":["Single lab; relationship to ciliary KIF7 functions unclear","Direct LKB1-KIF7 interaction not established"]},{"year":2013,"claim":"Reported a host-pathogen interaction in which Pseudomonas ExoS binds KIF7's N-terminal domain, with KIF7 silencing causing cytotoxicity.","evidence":"Yeast two-hybrid, pull-down with partial domain constructs, and KIF7 siRNA cytotoxicity readout","pmids":["24462444"],"confidence":"Low","gaps":["Yeast two-hybrid and single pull-down without reciprocal validation","Cytotoxicity readout indirect","Physiological relevance uncertain"]},{"year":2024,"claim":"Began resolving the temporal logic of Gli2 transport, indicating KIF7 coordinates an anterograde-biased IFT window for GLI2 tip localization following Hedgehog activation.","evidence":"Real-time single-particle GLI2 imaging in cilia with KIF7 mutants and IFT perturbation (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Mechanism by which KIF7 sets the timing window undefined"]},{"year":null,"claim":"How the multiple regulatory layers (auto-inhibition, dephosphorylation, ubiquitination, IFT delivery) are integrated in time to switch KIF7 between repressive and activating modes during a single Hedgehog response remains unresolved.","evidence":"No single study in the timeline unifies these inputs into one kinetic model","pmids":[],"confidence":"Medium","gaps":["No integrated kinetic model of KIF7 mode-switching","Kinase counteracting PPFIA1/PP2A not identified","Physiological trigger relieving auto-inhibition unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[9,14,12]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[12]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,3,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,8]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,2,9]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[9,14]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,3]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[13,16]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,2,5]}],"complexes":[],"partners":["GLI2","GLI3","GLI1","SUFU","PPFIA1","UBR3","NPHP1","KIF3A"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q2M1P5","full_name":"Kinesin-like protein KIF7","aliases":[],"length_aa":1343,"mass_kda":150.6,"function":"Essential for hedgehog signaling regulation: acts both as a negative and positive regulator of sonic hedgehog (Shh) and Indian hedgehog (Ihh) pathways, acting downstream of SMO, through both SUFU-dependent and -independent mechanisms (PubMed:21633164). Involved in the regulation of microtubular dynamics. Required for proper organization of the ciliary tip and control of ciliary localization of SUFU-GLI2 complexes (By similarity). Required for localization of GLI3 to cilia in response to Shh. Negatively regulates Shh signaling by preventing inappropriate activation of the transcriptional activator GLI2 in the absence of ligand. Positively regulates Shh signaling by preventing the processing of the transcription factor GLI3 into its repressor form. In keratinocytes, promotes the dissociation of SUFU-GLI2 complexes, GLI2 nuclear translocation and Shh signaling activation (By similarity). Involved in the regulation of epidermal differentiation and chondrocyte development (By similarity)","subcellular_location":"Cell projection, cilium; Cytoplasm, cytoskeleton, cilium basal body","url":"https://www.uniprot.org/uniprotkb/Q2M1P5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KIF7","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000166813","cell_line_id":"CID001427","localizations":[{"compartment":"centrosome","grade":3},{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"P4HA2","stoichiometry":10.0},{"gene":"RBM14","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001427","total_profiled":1310},"omim":[{"mim_id":"616546","title":"SHORT-RIB THORACIC DYSPLASIA 14 WITH POLYDACTYLY; SRTD14","url":"https://www.omim.org/entry/616546"},{"mim_id":"614464","title":"JOUBERT SYNDROME 15; JBTS15","url":"https://www.omim.org/entry/614464"},{"mim_id":"614120","title":"HYDROLETHALUS SYNDROME 2; HLS2","url":"https://www.omim.org/entry/614120"},{"mim_id":"611254","title":"KINESIN FAMILY MEMBER 7; KIF7","url":"https://www.omim.org/entry/611254"},{"mim_id":"611253","title":"KINESIN FAMILY MEMBER 27; KIF27","url":"https://www.omim.org/entry/611253"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Primary cilium","reliability":"Supported"},{"location":"Primary cilium tip","reliability":"Supported"},{"location":"Nucleoli fibrillar center","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/KIF7"},"hgnc":{"alias_symbol":["JBTS12"],"prev_symbol":[]},"alphafold":{"accession":"Q2M1P5","domains":[{"cath_id":"3.40.850.10","chopping":"13-360","consensus_level":"high","plddt":86.132,"start":13,"end":360},{"cath_id":"1.10.287,1.10.287","chopping":"697-885","consensus_level":"medium","plddt":80.1363,"start":697,"end":885},{"cath_id":"1.10.287,1.10.287","chopping":"920-1090","consensus_level":"medium","plddt":83.2487,"start":920,"end":1090},{"cath_id":"1.10.287","chopping":"413-429_438-452","consensus_level":"medium","plddt":86.9112,"start":413,"end":452}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q2M1P5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q2M1P5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q2M1P5-F1-predicted_aligned_error_v6.png","plddt_mean":67.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KIF7","jax_strain_url":"https://www.jax.org/strain/search?query=KIF7"},"sequence":{"accession":"Q2M1P5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q2M1P5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q2M1P5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q2M1P5"}},"corpus_meta":[{"pmid":"24952464","id":"PMC_24952464","title":"The 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in the absence of Shh it localizes to the base of the primary cilium, and Shh activation promotes trafficking of Kif7-eGFP to the cilium tip in a motor-domain-dependent manner.\",\n      \"method\": \"Genetic screen (reporter-based mutant allele), eGFP-tagged Kif7 live imaging in mouse embryo cells, motor domain mutant analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and live-imaging evidence, motor domain mutant, independently replicated across multiple labs in the same year\",\n      \"pmids\": [\"19666503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Kif7 physically interacts with Gli transcription factors, controls their proteolysis and stability, and acts both positively and negatively in Hedgehog signaling, paralleling the role of Drosophila Costal2.\",\n      \"method\": \"Co-immunoprecipitation of Kif7 with Gli proteins; Kif7 knockout mice with Gli processing readouts\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct physical interaction by Co-IP plus in vivo knockout with defined molecular phenotype; replicated across multiple studies\",\n      \"pmids\": [\"19549984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Kif7 accumulates at the distal tip of primary cilia in a Hedgehog-dependent manner and is required for efficient localization of Gli3 to cilia and for processing of Gli3 into its repressor form.\",\n      \"method\": \"Kif7 knockout mouse; immunofluorescence of Gli3 in cilia; immunoblot of Gli3 processing\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with multiple orthogonal readouts (localization, processing); replicated by other labs\",\n      \"pmids\": [\"19592253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Kif7 promotes Hedgehog pathway activity by restricting the inhibitory function of Sufu: Kif7 plays a role in Sufu turnover and exclusion of Sufu-Gli complexes from the primary cilium; genetic rescue by halving Sufu dose restores normal pathway activity in Kif7-null chondrocytes.\",\n      \"method\": \"Conditional knockout mice; epistasis (Kif7-null × Sufu heterozygous cross); immunofluorescence of Sufu-Gli complexes in cilia\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis with rescue experiment plus localization assay\",\n      \"pmids\": [\"21795282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"KIF7 co-precipitates with nephrocystin-1 (NPHP1); knockdown of KIF7 causes defects in cilia formation, abnormal centrosomal duplication, and fragmentation of the Golgi network, linked to abnormal tubulin acetylation and microtubule dynamics.\",\n      \"method\": \"Co-immunoprecipitation of KIF7 with nephrocystin-1; siRNA knockdown in cell lines; immunofluorescence of cilia, centrosomes, and Golgi; tubulin acetylation assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus knockdown with multiple cellular phenotype readouts, single lab\",\n      \"pmids\": [\"21633164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"KIF7 mutations cause deregulation of GLI transcription factor targets and impaired GLI3 processing in human patient tissues, establishing KIF7 as a regulator of GLI3 processing in human primary cilia.\",\n      \"method\": \"Patient tissue analysis; immunoblot of GLI3 processing; sequencing of KIF7 in ciliopathy cohorts; in vivo genetic interaction (zebrafish knockdown epistasis)\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient tissue biochemistry plus in vivo genetic interaction studies, replicated across multiple patient cohorts\",\n      \"pmids\": [\"21552264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sufu restricts Gli2 activity through cytoplasmic sequestration; Kif7 possesses both Sufu-dependent functions (promoting dissociation of Sufu-Gli2 complex) and Sufu-independent repressive functions in Hh signaling in keratinocytes; simultaneous deletion of both Sufu and Kif7 in embryonic skin abolishes follicular fate.\",\n      \"method\": \"Conditional knockout mice (skin-specific); double-knockout epistasis; localization assays for Sufu-Gli2 complexes\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean in vivo genetic epistasis with double-mutant phenotype readouts and defined mechanistic distinction\",\n      \"pmids\": [\"23034632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of the human Kif7 motor domain was determined at high resolution, revealing structural features shared with and distinct from conventional kinesin.\",\n      \"method\": \"X-ray crystallography of recombinant human Kif7 motor domain\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure of recombinant protein, single study but direct structural determination\",\n      \"pmids\": [\"22281744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Kif7 interacts with Gli1 and Gli2a in zebrafish, sequesters Gli proteins in cytoplasmic puncta, promotes Gli2a dissociation from Sufu, and mediates a Smoothened-dependent modification of full-length Gli2a; cytoplasmic Kif7 puncta disperse in response to Hh pathway activation. Drosophila Costal2 can substitute for Kif7 in zebrafish.\",\n      \"method\": \"Zinc finger nuclease-induced kif7 mutant alleles; co-immunoprecipitation of Kif7 with Gli1 and Gli2a; immunofluorescence of cytoplasmic Kif7 puncta; rescue with Drosophila Cos2\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — endogenous mutant alleles, Co-IP, localization, cross-species functional rescue, multiple methods in one study\",\n      \"pmids\": [\"24339784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Kif7 localizes to the cilium tip where it binds the plus ends of growing microtubules, reduces the rate of microtubule growth, and increases the frequency of microtubule catastrophe; this activity limits cilium length and controls cilium architecture, creating a single cilium tip compartment where Gli-Sufu activity is regulated. Kif7 is not required for intraflagellar transport or trafficking of Hh pathway proteins into cilia.\",\n      \"method\": \"In vitro TIRF microscopy of purified recombinant Kif7 on growing microtubules; mouse Kif7 mutant analysis; live-cell imaging of cilia\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified protein in vitro reconstitution assay plus mutant mouse phenotype, multiple orthogonal methods, widely replicated\",\n      \"pmids\": [\"24952464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Liprin-α1 (PPFIA1) and the protein phosphatase PP2A were identified as Kif7-interacting proteins by mass spectrometry; PPFIA1 and PP2A promote dephosphorylation of Kif7, triggering Kif7 localization to ciliary tips and promoting Gli transcriptional activity.\",\n      \"method\": \"Affinity purification–mass spectrometry (AP-MS) of Kif7; co-immunoprecipitation validation; phosphorylation assays; functional rescue experiments\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — AP-MS plus Co-IP validation plus phosphorylation assay plus functional consequence, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"25492966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"UBR3, an E3 ubiquitin ligase, poly-ubiquitinates Kif7 (mammalian homologue of Cos2), leading to its degradation; loss of UBR3 upregulates Kif7 protein levels and decreases Hh signaling in cultured cells.\",\n      \"method\": \"In vitro ubiquitination assay with mouse UBR3 and Kif7; Western blot of Kif7 levels upon UBR3 knockdown; Hh signaling readout\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro ubiquitination assay plus cellular knockdown with defined molecular phenotype, single lab\",\n      \"pmids\": [\"27195754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"KIF7 (and its Drosophila homologue Costal2) is immotile because it cannot release ADP in response to microtubule binding (defective mechanochemical coupling), enabling it to function as a microtubule-based tether of signaling complexes rather than a transporter.\",\n      \"method\": \"In vitro single-molecule motility assays; ATPase kinetics; ADP release assays; comparison of kinesin-4 family members\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro biochemical assays (ATPase, motility, ADP release) with mechanistic dissection, comparison across family members\",\n      \"pmids\": [\"29351996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Decreased GLI3R signaling is fully responsible for acrocallosal syndrome features in Kif7-null mice (rescued by crossing with Gli3Δ699 mice producing only GLI3R); increased FGF8 signaling is responsible in part for corpus callosum defects associated with KIF7 depletion.\",\n      \"method\": \"Kif7-null × Gli3Δ699 genetic rescue experiment; crossing with FGF8 signaling modifiers; cortical patterning analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis with rescue experiment defining pathway hierarchy, multiple genetic cross combinations\",\n      \"pmids\": [\"30445565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KIF7 is regulated by auto-inhibition mediated by an inhibitory coiled-coil (inhCC) segment; disease-associated mutations in the inhCC relieve auto-inhibition and result in strong microtubule binding. Uninhibited KIF7 binds along cytosolic and axonemal microtubules rather than preferentially at plus ends in cells. Localization to the cilium tip also requires the inhCC.\",\n      \"method\": \"Microtubule binding assays in cells; mutagenesis of inhCC; disease-associated mutant analysis; live-cell imaging\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus microtubule binding assay plus live-cell imaging with disease-associated alleles, multiple orthogonal methods\",\n      \"pmids\": [\"34114033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KIF7's microtubule binding is not required for Hedgehog-induced increase in KIF7 or Gli localization at the cilium tip; instead, kinesin-2 KIF3A/KIF3B/KAP (intraflagellar transport) mediates translocation of KIF7 to the cilium tip in response to Hh pathway activation. The immotile behavior of KIF7 is required to prevent ciliary localization of Gli transcription factors in the absence of Hh signaling.\",\n      \"method\": \"KIF7 microtubule-binding and motility variants; acute inhibition of intraflagellar transport via engineered kinesin-2 motor; Gli localization assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — engineered acute transport inhibition plus KIF7 variant panel plus Gli localization, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"34705483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In enteric neural crest cells, Kif7 inhibits Gli2, which in turn positively regulates Ezh2 expression by inhibiting miR124-mediated suppression; Ezh2 controls differentiation of enteric neural crest cells. Neural-crest-specific Kif7 deficiency causes a marked reduction of enteric NOS+ inhibitory neurons and gut motility defects.\",\n      \"method\": \"Neural-crest-specific Kif7 conditional knockout mice; Gli2 deletion rescue; Ezh2 inhibition rescue; human ENCC differentiation assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout, genetic rescue by Gli2 deletion or Ezh2 inhibition, defined cellular phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"34644112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The KIF7 coiled-coil (CC) domain enhances LKB1 expression and phosphorylation at Ser428, which induces PTEN phosphorylation and consequently blocks AKT phosphorylation at Ser473, attenuating prostate cancer cell proliferation and migration. Downregulation of LKB1 abrogates the anti-tumor effects of KIF7-CC.\",\n      \"method\": \"Ectopic expression of KIF7-CC domain in prostate cancer cell lines; Western blot of LKB1, pLKB1, PTEN, pAKT; LKB1 siRNA rescue; xenograft in vivo studies\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain dissection (CC vs MD), epistasis via LKB1 knockdown, in vivo xenograft, single lab\",\n      \"pmids\": [\"28903364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The ADPRT domain (residues 234-354) of Pseudomonas aeruginosa ExoS toxin binds to the N-terminal domain (residues 1-109) of KIF7, and silencing KIF7 expression causes cytotoxicity in human bronchial epithelial cells, suggesting ExoS can induce cytotoxicity by interacting with KIF7.\",\n      \"method\": \"Yeast two-hybrid screen; pull-down assay; KIF7 siRNA knockdown with cytotoxicity readout\",\n      \"journal\": \"Journal of infection and chemotherapy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid and single pull-down with partial domain constructs, single lab, indirect cytotoxicity readout\",\n      \"pmids\": [\"24462444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KIF7 is critical for the temporal control of Gli2 transport by IFT machinery and for spatial control of Gli2 localization at the cilium tip; IFT transports GLI2 with anterograde bias during a restricted time window following Hh pathway activation, and KIF7 coordinates this process.\",\n      \"method\": \"Real-time single-particle imaging of GLI2 within cilia; KIF7 mutant analysis; IFT machinery perturbation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-molecule real-time imaging plus KIF7 mutant analysis, preprint not peer-reviewed, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"KIF7 is an immotile kinesin-4 family protein that localizes to the tip of the primary cilium (trafficked there by IFT/KIF3A-KIF3B-KAP upon Hedgehog activation) where it binds microtubule plus ends, reduces microtubule growth rate, increases catastrophe frequency, and organizes the ciliary tip compartment; its immotility arises from inability to release ADP upon microtubule binding; it is regulated by auto-inhibition via an inhibitory coiled-coil domain and by UBR3-mediated poly-ubiquitination and degradation; at the cilium tip it physically interacts with Gli transcription factors and Sufu to coordinate both positive (dissociation of Sufu-Gli complexes) and negative (Gli sequestration/repression) regulation of Hedgehog transcriptional output, with PPFIA1-PP2A-mediated dephosphorylation promoting its ciliary tip trafficking, and the Kif7–Gli–Ezh2 axis governing additional developmental processes such as enteric neural crest cell differentiation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KIF7 is an immotile kinesin-4 family protein that functions as the core ciliary regulator of mammalian Hedgehog signal transduction, acting downstream of Smoothened and upstream of Gli2/Gli3 transcription factors as the vertebrate counterpart of Drosophila Costal2 [#0, #1]. In unstimulated cells it resides at the base of the primary cilium, and Hedgehog activation drives its accumulation at the distal ciliary tip, where it is required for efficient Gli3 ciliary localization and processing into the GLI3 repressor form [#0, #2]. At the cilium tip KIF7 binds the plus ends of growing microtubules, slows microtubule growth and increases catastrophe frequency, thereby limiting cilium length and organizing a single tip compartment in which Gli\\u2013Sufu activity is controlled [#9]. This regulatory output is bifunctional: KIF7 physically interacts with Gli proteins, sequesters them in cytoplasmic puncta, and both promotes dissociation of Sufu\\u2013Gli complexes (a positive, Sufu-dependent activity) and exerts Sufu-independent repressive functions, with halving Sufu dose genetically rescuing Kif7-null phenotypes [#1, #3, #6, #8]. Its immotility arises from a failure to release ADP upon microtubule binding, converting it from a transporter into a microtubule-based tether of signaling complexes; this immotile behavior prevents inappropriate ciliary Gli localization without Hedgehog input [#12, #15]. KIF7 activity is gated by auto-inhibition through an inhibitory coiled-coil whose disease-associated mutations relieve inhibition and cause aberrant microtubule binding [#14], by PPFIA1/PP2A-mediated dephosphorylation that triggers ciliary tip trafficking [#10], and by UBR3-mediated poly-ubiquitination and degradation [#11]; trafficking to the tip itself is executed by the kinesin-2 KIF3A/KIF3B/KAP intraflagellar transport motor [#15]. In mouse models, loss of KIF7 produces acrocallosal-syndrome features attributable to decreased GLI3R signaling, and KIF7 mutations deregulate GLI targets and impair GLI3 processing in human ciliopathy patients [#5, #13]. Beyond canonical Hedgehog control, KIF7 governs enteric neural crest cell differentiation via a Kif7\\u2013Gli2\\u2013Ezh2 axis [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established KIF7 as the missing vertebrate node of cilium-based Hedgehog transduction, placing it downstream of Smoothened and upstream of Gli transcription factors and linking it functionally to Drosophila Costal2.\",\n      \"evidence\": \"Genetic screen, eGFP-Kif7 live imaging with motor-domain mutants, Co-IP with Gli, and Kif7 knockout mice with Gli processing readouts\",\n      \"pmids\": [\"19666503\", \"19549984\", \"19592253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how Hedgehog-dependent tip trafficking is mechanically achieved\", \"Did not distinguish KIF7's positive from negative regulatory activities at the molecular level\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined KIF7 as a regulator of Sufu, showing it restricts Sufu inhibitory function and excludes Sufu-Gli complexes from cilia, with genetic Sufu-dose rescue establishing a direct epistatic relationship.\",\n      \"evidence\": \"Conditional knockout mice and Kif7-null x Sufu-heterozygous epistasis cross with ciliary localization assays\",\n      \"pmids\": [\"21795282\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Sufu turnover by KIF7 not defined\", \"Did not separate Sufu-dependent from Sufu-independent KIF7 functions\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected KIF7 to human disease by showing patient mutations deregulate GLI targets and impair GLI3 processing, establishing clinical relevance for the ciliary Hedgehog role.\",\n      \"evidence\": \"Patient tissue GLI3 immunoblots, KIF7 sequencing in ciliopathy cohorts, and zebrafish knockdown epistasis\",\n      \"pmids\": [\"21552264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish biochemical mechanism by which mutations disrupt processing\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Implicated KIF7 in broader ciliogenesis and cytoskeletal homeostasis through interaction with nephrocystin-1 and effects on centrosomes, Golgi, and tubulin acetylation.\",\n      \"evidence\": \"Co-IP with NPHP1 and siRNA knockdown with cilia, centrosome, Golgi, and tubulin acetylation readouts\",\n      \"pmids\": [\"21633164\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab without reciprocal validation\", \"Relationship between NPHP1 interaction and Hedgehog functions unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Dissected KIF7's dual nature into Sufu-dependent (Gli dissociation) and Sufu-independent repressive activities, and provided a crystal structure of the motor domain to ground its mechanism.\",\n      \"evidence\": \"Skin-specific conditional knockouts with Sufu/Kif7 double-mutant epistasis, plus X-ray crystallography of the recombinant human motor domain\",\n      \"pmids\": [\"23034632\", \"22281744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure did not explain immotility mechanistically\", \"Molecular identity of the Sufu-independent repressive activity unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Confirmed cross-species conservation by showing zebrafish Kif7 sequesters Gli in cytoplasmic puncta, mediates a Smoothened-dependent Gli2a modification, and can be functionally replaced by Drosophila Cos2.\",\n      \"evidence\": \"Zinc-finger-nuclease kif7 mutants, Co-IP with Gli1/Gli2a, puncta imaging, and Cos2 rescue\",\n      \"pmids\": [\"24339784\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nature of the Smoothened-dependent Gli2a modification not identified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed the biochemical core of KIF7's function: it binds microtubule plus ends to suppress growth and promote catastrophe, building the single ciliary tip compartment where Gli-Sufu is regulated, independent of intraflagellar transport.\",\n      \"evidence\": \"In vitro TIRF microscopy of purified KIF7 on growing microtubules plus mouse mutant and live-cell cilium imaging\",\n      \"pmids\": [\"24952464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain how an immotile kinesin reaches the tip\", \"Did not define the tip-localization signal\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified post-translational control of KIF7 trafficking, showing PPFIA1/PP2A dephosphorylate KIF7 to trigger ciliary tip localization and Gli activity.\",\n      \"evidence\": \"AP-MS, Co-IP validation, phosphorylation assays, and functional rescue\",\n      \"pmids\": [\"25492966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase opposing this dephosphorylation not identified\", \"Phosphosite mapping incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Added degradative control, demonstrating that the E3 ligase UBR3 poly-ubiquitinates KIF7 to limit its abundance and tune Hedgehog output.\",\n      \"evidence\": \"In vitro ubiquitination assay and UBR3 knockdown with KIF7 protein and Hh readouts\",\n      \"pmids\": [\"27195754\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab without in vivo confirmation\", \"Ubiquitination sites and degradation context not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Explained KIF7's defining immotility, showing it cannot release ADP upon microtubule binding and thus acts as a tether rather than a transporter.\",\n      \"evidence\": \"In vitro single-molecule motility, ATPase kinetics, and ADP-release assays across kinesin-4 members\",\n      \"pmids\": [\"29351996\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address how the immotile tether is delivered to the cilium tip\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined the pathway hierarchy underlying KIF7 disease phenotypes, attributing acrocallosal-syndrome features to decreased GLI3R and corpus callosum defects partly to increased FGF8 signaling.\",\n      \"evidence\": \"Kif7-null x Gli3\\u0394699 genetic rescue and FGF8 modifier crosses with cortical patterning analysis\",\n      \"pmids\": [\"30445565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve cell-autonomous versus tissue-level contributions\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Reconciled trafficking and microtubule binding by showing kinesin-2 IFT carries KIF7 to the tip while KIF7 microtubule binding is dispensable for tip accumulation, and that immotility prevents basal ciliary Gli localization.\",\n      \"evidence\": \"KIF7 microtubule-binding/motility variant panel, acute engineered IFT inhibition, and Gli localization assays\",\n      \"pmids\": [\"34705483\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How KIF7 cargo recognition by IFT is achieved not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified auto-inhibition via an inhibitory coiled-coil as the conformational switch governing microtubule binding and tip localization, with disease mutations relieving inhibition.\",\n      \"evidence\": \"inhCC mutagenesis, disease-allele analysis, microtubule-binding and live-cell imaging\",\n      \"pmids\": [\"34114033\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal that physiologically relieves auto-inhibition unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended KIF7 function beyond canonical patterning to enteric neural crest differentiation through a Kif7-Gli2-Ezh2 axis, with KIF7 loss reducing inhibitory enteric neurons and impairing gut motility.\",\n      \"evidence\": \"Neural-crest-specific conditional knockout with Gli2-deletion and Ezh2-inhibition rescues and human ENCC differentiation assays\",\n      \"pmids\": [\"34644112\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"miR124-Ezh2 regulatory detail downstream of Gli2 not fully mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Proposed a Hedgehog-independent tumor-suppressive role in which the KIF7 coiled-coil enhances LKB1 to engage PTEN and suppress AKT in prostate cancer cells.\",\n      \"evidence\": \"Ectopic KIF7-CC expression with LKB1/PTEN/AKT immunoblots, LKB1 siRNA rescue, and xenografts\",\n      \"pmids\": [\"28903364\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; relationship to ciliary KIF7 functions unclear\", \"Direct LKB1-KIF7 interaction not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Reported a host-pathogen interaction in which Pseudomonas ExoS binds KIF7's N-terminal domain, with KIF7 silencing causing cytotoxicity.\",\n      \"evidence\": \"Yeast two-hybrid, pull-down with partial domain constructs, and KIF7 siRNA cytotoxicity readout\",\n      \"pmids\": [\"24462444\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Yeast two-hybrid and single pull-down without reciprocal validation\", \"Cytotoxicity readout indirect\", \"Physiological relevance uncertain\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Began resolving the temporal logic of Gli2 transport, indicating KIF7 coordinates an anterograde-biased IFT window for GLI2 tip localization following Hedgehog activation.\",\n      \"evidence\": \"Real-time single-particle GLI2 imaging in cilia with KIF7 mutants and IFT perturbation (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Mechanism by which KIF7 sets the timing window undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple regulatory layers (auto-inhibition, dephosphorylation, ubiquitination, IFT delivery) are integrated in time to switch KIF7 between repressive and activating modes during a single Hedgehog response remains unresolved.\",\n      \"evidence\": \"No single study in the timeline unifies these inputs into one kinetic model\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated kinetic model of KIF7 mode-switching\", \"Kinase counteracting PPFIA1/PP2A not identified\", \"Physiological trigger relieving auto-inhibition unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [9, 14, 12]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 3, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 2, 9]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [9, 14]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [13, 16]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GLI2\", \"GLI3\", \"GLI1\", \"SUFU\", \"PPFIA1\", \"UBR3\", \"NPHP1\", \"KIF3A\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}