{"gene":"CILK1","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2000,"finding":"ICK (intestinal cell kinase) was cloned and identified as a novel serine/threonine kinase harboring a dual phosphorylation site (TXY motif) found in MAP kinases, which is important for kinase activity; it localizes to the intestinal crypt region.","method":"PCR cloning from intestinal crypt cDNA library, Northern blot, RNA in situ hybridization","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — initial cloning and characterization, dual phosphorylation site identified by sequence analysis and localization by in situ hybridization, single lab","pmids":["10699974"],"is_preprint":false},{"year":2012,"finding":"ICK promotes activation of mTOR complex 1 (mTORC1) by directly phosphorylating Raptor at Thr-908; ICK can phosphorylate Raptor both in vitro and in vivo, and expression of Raptor T908A mutant markedly impairs mTORC1 activation by insulin or RheB under nutrient starvation.","method":"In vitro kinase assay, mass spectrometry, phospho-specific antibody, co-immunoprecipitation, site-directed mutagenesis (T908A)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay, mass spectrometry identification of phosphosite, phospho-specific antibody validation, mutagenesis rescue experiment, multiple orthogonal methods in single rigorous study","pmids":["22356909"],"is_preprint":false},{"year":2014,"finding":"ICK localizes to the tip of cilia and is essential for ciliary transport; loss of ICK in mice causes accumulation of IFT-A, IFT-B, and BBSome components at ciliary tips, while overexpression induces IFT-B (but not IFT-A or BBSome) accumulation at tips; ICK directly phosphorylates Kif3a, and inhibition of this phosphorylation affects ciliary formation.","method":"ICK-deficient mouse model, immunolocalization, live imaging, in vitro kinase assay (Kif3a phosphorylation), overexpression experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — loss-of-function mouse model with defined IFT phenotype, direct in vitro kinase assay establishing Kif3a as substrate, multiple orthogonal methods","pmids":["24797473"],"is_preprint":false},{"year":2014,"finding":"ICK and MOK localize to cilia of renal epithelial cells and negatively regulate cilium length; ICK is transported as part of or by the IFT machinery (moves at ~0.45 µm/s similar to IFT proteins); ICK knockdown increases anterograde IFT velocities while overexpression reduces retrograde IFT speed; effects on cilia length and IFT are suppressed by rapamycin, implicating the mTORC1 pathway.","method":"Live fluorescence imaging of GFP-tagged IFT proteins, siRNA knockdown, overexpression, rapamycin treatment, velocity measurements","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — live imaging with direct velocity measurements, loss- and gain-of-function experiments, pathway suppression with rapamycin, multiple orthogonal approaches","pmids":["25243405"],"is_preprint":false},{"year":2016,"finding":"A missense mutation p.E80K in ICK abolishes serine/threonine kinase activity, resulting in altered ICK subcellular and ciliary localization, increased cilia length, aberrant cartilage growth plate structure, and defective Hedgehog and altered ERK signaling; ICK kinase activity is thus required for normal Hedgehog signaling and skeletogenesis.","method":"Exome sequencing of patient cohort, in vitro kinase activity assay of E80K mutant, immunofluorescence localization, patient fibroblast analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — kinase activity abolished confirmed by direct assay, linked to ciliary localization changes and Hedgehog pathway defects, multiple methods in one study","pmids":["27466187"],"is_preprint":false},{"year":2016,"finding":"ICK mutations (p.R272Q and p.G120C) cause ECO syndrome; mutant ICK proteins mislocalize to the ciliary tip rather than distributing along the axoneme/ciliary base as wild-type ICK does; cells from affected individuals show decreased ciliation, confirming ICK regulates ciliogenesis.","method":"Homozygosity mapping, whole-exome sequencing, mRFP-ICK expression (wild-type and mutant), immunocytochemistry of patient fibroblasts","journal":"Cilia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization comparison of WT vs mutant proteins, patient-derived cell analysis, two orthogonal methods, single lab","pmids":["27069622"],"is_preprint":false},{"year":2017,"finding":"ICK regulates intraflagellar transport (IFT) at the tip of kinocilia in inner ear hair cells; loss of Ick leads to abnormal ciliary localization of IFT component Ift88, planar cell polarity (PCP) defects including misorientation of stereocilia and aberrant kinocilium localization, and auditory dysfunction.","method":"Conditional Ick knockout mice, immunofluorescence (Ift88 localization), auditory function tests (ABR), confocal microscopy of stereocilia","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse with defined IFT and PCP phenotypes, direct immunolocalization, functional hearing assay, multiple orthogonal readouts","pmids":["28115485"],"is_preprint":false},{"year":2019,"finding":"The C-terminal non-catalytic domain (CTD) of ICK/CAPK is required for substrate recognition and phosphorylation of KIF3A; CTD truncation impairs both KIF3A phosphorylation and localization of ICK to the primary cilium, and eliminates negative regulation of ciliogenesis.","method":"CTD truncation mutants, in vitro kinase assay (KIF3A phosphorylation), immunofluorescence localization, ciliation rate quantification","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple deletion constructs tested, kinase assay, localization and ciliation phenotype, single lab","pmids":["31277411"],"is_preprint":false},{"year":2020,"finding":"ICK/CILK1 is transported anterogradely to the ciliary tip via direct interaction of its C-terminal non-catalytic region with the IFT-B complex; ICK undergoes bidirectional movement within cilia at velocities similar to IFT particles; ICK deficiency severely impairs retrograde IFT trafficking and causes ciliary proteins and IFT components to accumulate at the bulged ciliary tip, which can be released as extracellular vesicles; IFT-dependent transport of ICK, its kinase activity, and TDY motif phosphorylation are all required for ICK function.","method":"Co-immunoprecipitation (ICK C-terminal domain with IFT-B complex), total internal reflection fluorescence (TIRF) microscopy of ICK movement, ICK knockout cell analysis, exogenous expression of ICK constructs in KO cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct Co-IP establishing IFT-B binding, TIRF live imaging of bidirectional movement, KO rescue experiments with multiple ICK constructs, multiple orthogonal methods in one rigorous study","pmids":["32732286"],"is_preprint":false},{"year":2020,"finding":"JME pathogenic mutations in the CILK1 N-terminal kinase domain abolish kinase activity and eliminate phosphorylation of KIF3A at Thr672; JME mutations in the C-terminal non-catalytic domain (CTD) retain kinase activity but lose ability to restrict cilia length, promote ciliogenesis, and shift localization from the ciliary base to the entire axoneme.","method":"In vitro kinase assay (KIF3A-Thr672 phosphorylation), immunofluorescence localization, cilia length measurements, ciliation rate quantification","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase activity directly measured, localization and cilia phenotype assessed, multiple JME mutations analyzed, single lab","pmids":["32178256"],"is_preprint":false},{"year":2020,"finding":"Eliminating Kif3a Thr674 phosphorylation by Cilk1 (via T674A knock-in mouse) is insufficient to reproduce the severe developmental defects caused by Cilk1 loss of function, indicating that KIF3A-Thr672 phosphorylation is not essential for tissue development and that other CILK1 substrates mediate ciliopathy phenotypes.","method":"Kif3a T674A knock-in mouse model, skeletal analysis, MEF ciliation assay, cilia length measurement","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo phosphorylation site knock-in mouse, multiple tissue and cellular phenotype readouts; negative result mechanistically informative, single lab","pmids":["32935890"],"is_preprint":false},{"year":2022,"finding":"BROMI/TBC1D32 interacts with CCRK/CDK20, which phosphorylates and activates ICK/CILK1; BROMI also interacts with FAM149B1/JBTS36 and CFAP20; CCRK-KO, BROMI-KO, and FAM149B1-KO cells all show abnormally long cilia and accumulation of IFT machinery and ICK at the ciliary tip, placing CCRK upstream of ICK in a signaling axis that regulates IFT turnaround at the ciliary tip.","method":"Co-immunoprecipitation, knockout cell analysis (CCRK-KO, BROMI-KO, FAM149B1-KO), rescue experiments with BROMI mutants defective in CCRK binding, immunofluorescence","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, multiple KO cell lines with concordant phenotypes, domain-specific binding mutant rescue experiments, multiple orthogonal methods","pmids":["35609210"],"is_preprint":false},{"year":2022,"finding":"Alvocidib potently inhibits CILK1 kinase activity (IC50 = 20 nM) and induces CILK1-dependent cilia elongation, demonstrating pharmacological inhibition of CILK1 modulates primary cilia length.","method":"In vitro kinase inhibition assay (IC50 determination), cilia length measurements in cells treated with Alvocidib vs. CILK1 KO cells","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct kinase inhibition assay with IC50, cellular cilia elongation phenotype showing CILK1-dependence, single lab","pmids":["35897693"],"is_preprint":false},{"year":2022,"finding":"KLC3 (kinesin light chain-3) interacts with CILK1 at cilia bases; in CILK1-deficient cells, KLC3 is upregulated and its overexpression promotes ciliary recruitment of IFT-B and EGFR, contributing to cystic defects; reduction of KLC3 rescues ciliary defects and inhibits cyst progression in CILK1-deficient kidneys.","method":"Yeast two-hybrid, co-immunoprecipitation, immunocytochemistry, conditional Cilk1 KO mice, KLC3 knockdown rescue experiments","journal":"Journal of the American Society of Nephrology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus co-IP for interaction, KO mouse model, KLC3 KD rescue; mechanistic pathway placement, single lab","pmids":["35961787"],"is_preprint":false},{"year":2023,"finding":"KATNIP (katanin-interacting protein/KIAA0556) co-localizes with CILK1 at the basal body; the CILK1 C-terminal intrinsically disordered region (IDR) mediates binding to KATNIP; KATNIP binding drastically elevates CILK1 protein levels and TDY motif phosphorylation (activation), increases phosphorylation of CILK1 substrates, and suppresses cilia length, establishing KATNIP as a regulatory scaffold that potentiates CILK1 function.","method":"Co-immunoprecipitation, deletion analysis of CILK1 IDR and KATNIP DUF domains, immunofluorescence colocalization, CILK1 substrate phosphorylation assays, cilia length measurement","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal domain deletion analysis plus Co-IP, TDY phosphorylation and substrate phosphorylation assays, cilia phenotype, multiple orthogonal methods in one rigorous study","pmids":["37665596"],"is_preprint":false},{"year":2024,"finding":"CCRK kinase is an upstream activator of both Mak and Ick in retinal photoreceptor cells; Mak and Ick cooperatively regulate IFT at ciliary tips; simultaneous disruption of Mak and Ick causes loss of photoreceptor ciliary axonemes and severe retinal degeneration; gene delivery of Ick ameliorates retinal degeneration in Mak-deficient mice; FGF receptors act as negative regulators of Ick.","method":"Conditional double-KO mouse model (Mak and Ick), AAV-mediated Ick gene delivery rescue, FGF receptor inhibitor treatment, retinal histology, in vivo epistasis analysis","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in vivo (double KO), gene delivery rescue, pharmacological inhibition of upstream regulator, multiple functional readouts in mouse model","pmids":["39293864"],"is_preprint":false},{"year":2024,"finding":"A JME-associated CILK1 A615T variant (in the C-terminal IDR) compromises KATNIP-mediated regulation of CILK1; MEFs with the A612T knock-in allele (heterozygous or homozygous) show higher ciliation rate, shorter cilia, and upregulation of ciliary Hedgehog signaling; the CILK1 A615T mutant protein is not elevated by KATNIP co-expression to the same extent as wild-type CILK1.","method":"Knock-in mouse model (A612T), MEF analysis, immunofluorescence (ciliation rate, cilia length), Hedgehog signaling readout, co-expression with KATNIP","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knock-in mouse model with cellular phenotype, KATNIP co-expression experiment, multiple cilia readouts, single lab","pmids":["39120290"],"is_preprint":false},{"year":2025,"finding":"KATNIP disease variants that truncate near the C-terminus (M1474C) bind to CILK1 but do not support TDY activating phosphorylation in CILK1, phosphorylation of CILK1 substrates, or restriction of cilia length and ciliation rate; residues 1524-1573 of KATNIP (predicted β-sheets and α-helix) are essential for CILK1 activation, separating KATNIP's binding and activation functions for CILK1.","method":"KATNIP deletion constructs, Co-immunoprecipitation, TDY phosphorylation assay, CILK1 substrate phosphorylation assay, cilia length and ciliation rate quantification","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain deletion analysis distinguishes binding vs activation, direct TDY phosphorylation and substrate phosphorylation assays, cilia phenotype, single lab","pmids":["40621737"],"is_preprint":false},{"year":2025,"finding":"A homozygous frameshift variant in the CILK1 non-catalytic C-terminal domain causes cranioectodermal dysplasia; patient-derived cells show reduced cilia number, increased cilia length, and disrupted IFT component localization; the CILK1 variant protein retains correct ciliary localization; reintroduction of wild-type CILK1 rescues the majority of ciliary defects.","method":"Patient-derived cell analysis, C. elegans model, immunofluorescence (cilia number/length, IFT localization), rescue by CILK1 re-expression","journal":"European journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient cell functional analysis, model organism confirmation, rescue by re-expression, single lab","pmids":["40615527"],"is_preprint":false},{"year":2024,"finding":"In C. elegans, absence of DYF-5 (CILK1 homolog) causes accumulation of IFT components at the ciliary tip, loss of restriction of kinesin-II to the proximal ciliary segment, reduced IFT train frequency (especially retrograde trains), and impaired retrograde transport leading to depletion of IFT components at the ciliary base and impeded anterograde train assembly; DYF-5/CILK1 thus regulates IFT train turnaround at the ciliary tip.","method":"Fluorescence imaging and single-molecule tracking in live C. elegans phasmid cilia, IFT velocity and frequency measurements in dyf-5 null mutants","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single-molecule live imaging with quantitative measurements in loss-of-function model, consistent with mammalian CILK1 data; preprint, single lab","pmids":["bio_10.1101_2024.09.11.612404"],"is_preprint":true}],"current_model":"CILK1 (ICK) is a conserved serine/threonine MAP kinase-like kinase that localizes to the ciliary tip via anterograde IFT-B-mediated transport, where its kinase activity (activated by upstream CCRK phosphorylation of the TDY motif and potentiated by the scaffold protein KATNIP) is required to regulate IFT train turnaround—promoting retrograde transport and preventing accumulation of IFT-A, IFT-B, and BBSome components at the tip; it phosphorylates substrates including KIF3A and Raptor (activating mTORC1), controls cilia length and ciliogenesis through its C-terminal intrinsically disordered region, and is essential for Hedgehog signaling, planar cell polarity, and normal development, with loss-of-function mutations causing multiple ciliopathies."},"narrative":{"mechanistic_narrative":"CILK1 (ICK) is a conserved serine/threonine kinase of the MAP kinase-like family that localizes to the tip of cilia and governs intraflagellar transport (IFT) train turnaround during ciliogenesis [PMID:24797473, PMID:25243405]. It is delivered anterogradely to the ciliary tip through direct binding of its C-terminal non-catalytic region to the IFT-B complex, moving bidirectionally at IFT-particle velocities; loss of CILK1 impairs retrograde IFT and causes IFT-A, IFT-B, and BBSome components to accumulate at a bulged ciliary tip, with kinase activity, TDY-motif phosphorylation, and IFT-dependent transport all required for function [PMID:24797473, PMID:32732286]. CILK1 directly phosphorylates KIF3A (at Thr672/Thr674), but ablating this single site is insufficient to reproduce CILK1-loss developmental defects, indicating additional substrates mediate ciliopathy phenotypes [PMID:24797473, PMID:32178256, PMID:32935890]; it also phosphorylates Raptor at Thr908 to activate mTORC1, and its control of cilia length acts through the mTORC1 pathway [PMID:22356909, PMID:25243405]. CILK1 activity is set by an upstream CCRK/CDK20 axis—scaffolded by BROMI/TBC1D32—that phosphorylates and activates the kinase, and is further potentiated by KATNIP, which binds the CILK1 C-terminal intrinsically disordered region to elevate CILK1 protein levels, TDY-motif phosphorylation, substrate phosphorylation, and cilia-length restriction [PMID:35609210, PMID:37665596, PMID:40621737]. Through these activities CILK1 is essential for Hedgehog signaling, planar cell polarity, and skeletal and sensory development [PMID:27466187, PMID:28115485, PMID:39120290]. Loss-of-function and C-terminal variants of CILK1 cause multiple human ciliopathies, including a skeletal/Hedgehog disorder, ECO syndrome, juvenile myoclonic epilepsy, and cranioectodermal dysplasia [PMID:27466187, PMID:27069622, PMID:32178256, PMID:40615527].","teleology":[{"year":2000,"claim":"Established CILK1/ICK as a distinct serine/threonine kinase carrying a MAP-kinase-type dual-phosphorylation (TXY) activation motif, defining the molecular class of the enzyme before any cellular role was known.","evidence":"PCR cloning from intestinal crypt cDNA, Northern blot, in situ hybridization","pmids":["10699974"],"confidence":"Medium","gaps":["No substrate or pathway identified","Ciliary role not yet recognized","Activation mechanism of the TXY/TDY motif unresolved"]},{"year":2012,"claim":"Identified the first direct substrate, showing CILK1 phosphorylates Raptor at Thr908 to enable mTORC1 activation, linking the kinase to nutrient/growth signaling.","evidence":"In vitro kinase assay, mass spectrometry, phospho-specific antibody, T908A mutagenesis rescue","pmids":["22356909"],"confidence":"High","gaps":["Connection between mTORC1 regulation and cilia not yet drawn","Physiological context of Raptor phosphorylation in vivo unclear"]},{"year":2014,"claim":"Defined CILK1's core cellular role: it localizes to the ciliary tip, is required for IFT, and phosphorylates KIF3A, with loss causing accumulation of IFT-A, IFT-B, and BBSome at tips—and showed its ciliary effects involve the mTORC1 pathway.","evidence":"ICK-deficient mouse, immunolocalization, live imaging, in vitro KIF3A kinase assay; separate live IFT velocity imaging with rapamycin suppression","pmids":["24797473","25243405"],"confidence":"High","gaps":["Mechanism of tip recruitment not yet defined","Whether KIF3A phosphorylation is the relevant in vivo substrate untested","How mTORC1 and IFT control intersect mechanistically unclear"]},{"year":2016,"claim":"Connected CILK1 kinase activity to human disease and developmental signaling, showing kinase-dead mutations alter ciliary localization, lengthen cilia, and disrupt Hedgehog signaling and skeletogenesis, and that distinct mutations cause ECO syndrome with ciliogenesis defects.","evidence":"Exome sequencing of patients, in vitro kinase assays of E80K, patient fibroblast localization; homozygosity mapping and WT/mutant mRFP-ICK localization for ECO syndrome","pmids":["27466187","27069622"],"confidence":"High","gaps":["Hedgehog defect downstream effectors not identified","Relationship between localization shift and signaling loss not mechanistically resolved"]},{"year":2017,"claim":"Extended CILK1's IFT-regulatory role to sensory tissue and planar cell polarity, showing kinocilia of hair cells require Ick for correct IFT88 localization, stereocilia orientation, and hearing.","evidence":"Conditional Ick knockout mice, IFT88 immunofluorescence, ABR auditory tests, confocal stereocilia imaging","pmids":["28115485"],"confidence":"High","gaps":["Molecular link between IFT regulation and PCP unestablished","Substrate mediating PCP effects unknown"]},{"year":2019,"claim":"Dissected the domain architecture, demonstrating the C-terminal non-catalytic domain is required for KIF3A substrate recognition, ciliary localization, and negative regulation of ciliogenesis—separating catalysis from targeting.","evidence":"CTD truncation mutants, in vitro KIF3A kinase assay, immunofluorescence, ciliation quantification","pmids":["31277411"],"confidence":"Medium","gaps":["Binding partner mediating CTD-dependent localization not yet identified","Single-lab construct study"]},{"year":2020,"claim":"Resolved how CILK1 reaches and acts at the tip: its C-terminal region binds IFT-B for anterograde delivery, and its kinase activity is needed for retrograde IFT turnaround—while a KIF3A phospho-site knock-in showed that single substrate is not sufficient to explain developmental phenotypes, and JME mutations split into kinase-dead versus localization/length-control classes.","evidence":"Co-IP of CILK1 CTD with IFT-B, TIRF live imaging, KO rescue; Kif3a T674A knock-in mouse; in vitro KIF3A-Thr672 assays with JME mutants","pmids":["32732286","32935890","32178256"],"confidence":"High","gaps":["Identity of the additional CILK1 substrates driving development unknown","Direct IFT-B subunit contacted not pinpointed","How CTD mutations alter axonemal distribution mechanistically unclear"]},{"year":2022,"claim":"Placed CILK1 within an upstream activation axis and identified additional partners, showing CCRK/CDK20 (scaffolded by BROMI/TBC1D32) phosphorylates and activates CILK1 to control tip IFT turnaround, and that KLC3 binds CILK1 at cilia bases to modulate IFT-B/EGFR recruitment in kidney; pharmacological inhibition (Alvocidib) confirmed CILK1-dependent cilia elongation.","evidence":"Reciprocal Co-IP and multiple KO cell lines (CCRK, BROMI, FAM149B1); yeast two-hybrid + Co-IP and conditional Cilk1 KO mice for KLC3; in vitro IC50 kinase inhibition assay","pmids":["35609210","35961787","35897693"],"confidence":"High","gaps":["Direct CCRK phosphosite on CILK1 within this axis not mapped here","Whether KLC3 effects are kinase-dependent unclear","Off-target profile of Alvocidib not addressed"]},{"year":2023,"claim":"Identified KATNIP as a regulatory scaffold that potentiates CILK1, showing its binding to the CILK1 C-terminal IDR elevates CILK1 levels, TDY-motif and substrate phosphorylation, and restricts cilia length.","evidence":"Co-IP, reciprocal domain deletion of CILK1 IDR and KATNIP DUF domains, TDY/substrate phosphorylation assays, cilia length measurement","pmids":["37665596"],"confidence":"High","gaps":["Whether KATNIP stabilizes CILK1 directly or via reduced turnover unclear","Relationship between KATNIP and CCRK activation pathways unresolved"]},{"year":2024,"claim":"Demonstrated functional cooperation and disease relevance: CCRK activates both Mak and Ick to co-regulate photoreceptor tip IFT with FGF receptors as negative regulators, and a JME-associated IDR variant (A615T) selectively impairs KATNIP-mediated CILK1 regulation, deregulating Hedgehog signaling.","evidence":"Conditional Mak/Ick double-KO mice with AAV-Ick rescue and FGFR inhibition; A612T knock-in MEF analysis with KATNIP co-expression and Hedgehog readouts","pmids":["39293864","39120290"],"confidence":"High","gaps":["Mechanism of FGFR-mediated negative regulation unmapped","How A615T alters KATNIP binding versus stabilization not fully resolved"]},{"year":2025,"claim":"Refined the KATNIP activation mechanism and broadened the disease spectrum, showing a C-terminal KATNIP residue stretch (1524-1573) is required to activate CILK1 (separating binding from activation), and a C-terminal frameshift CILK1 variant causes cranioectodermal dysplasia with rescuable ciliary defects.","evidence":"KATNIP deletion constructs with TDY/substrate phosphorylation and cilia assays; patient-derived cells, C. elegans model, and CILK1 re-expression rescue","pmids":["40621737","40615527"],"confidence":"Medium","gaps":["Structural basis of KATNIP-mediated activation not solved","Single-lab disease cohorts"]},{"year":null,"claim":"The full set of physiologically relevant CILK1 substrates beyond KIF3A and Raptor that drive Hedgehog, PCP, and developmental phenotypes remains unidentified.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No substrate proven to mediate the developmental ciliopathy phenotypes","Direct molecular mechanism converting tip kinase activity into IFT turnaround unresolved","No structure of CILK1 in complex with KATNIP or IFT-B"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,7,9]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,2]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[2,3,5,8]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[2,3,8]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,6,16]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,8,19]}],"complexes":[],"partners":["KATNIP","CCRK","IFT-B","KIF3A","RPTOR","KLC3","TBC1D32"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UPZ9","full_name":"Serine/threonine-protein kinase ICK","aliases":["Ciliogenesis associated kinase 1","Intestinal cell kinase","hICK","Laryngeal cancer kinase 2","LCK2","MAK-related kinase","MRK"],"length_aa":632,"mass_kda":71.4,"function":"Required for ciliogenesis (PubMed:24797473). Phosphorylates KIF3A (By similarity). Involved in the control of ciliary length (PubMed:24853502). Regulates the ciliary localization of SHH pathway components as well as the localization of IFT components at ciliary tips (By similarity). May play a key role in the development of multiple organ systems and particularly in cardiac development (By similarity). Regulates intraflagellar transport (IFT) speed and negatively regulates cilium length in a cAMP and mTORC1 signaling-dependent manner and this regulation requires its kinase activity (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9UPZ9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CILK1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CILK1","total_profiled":1310},"omim":[{"mim_id":"621337","title":"CRANIOECTODERMAL DYSPLASIA 6; CED6","url":"https://www.omim.org/entry/621337"},{"mim_id":"617924","title":"EPILEPSY, JUVENILE MYOCLONIC, SUSCEPTIBILITY TO, 10; EJM10","url":"https://www.omim.org/entry/617924"},{"mim_id":"612651","title":"ENDOCRINE-CEREBROOSTEODYSPLASIA; ECO","url":"https://www.omim.org/entry/612651"},{"mim_id":"612325","title":"CILIOGENESIS-ASSOCIATED KINASE 1; CILK1","url":"https://www.omim.org/entry/612325"},{"mim_id":"218330","title":"CRANIOECTODERMAL DYSPLASIA 1; CED1","url":"https://www.omim.org/entry/218330"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Primary cilium tip","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CILK1"},"hgnc":{"alias_symbol":["MRK","LCK2","KIAA0936","MGC46090"],"prev_symbol":["ICK"]},"alphafold":{"accession":"Q9UPZ9","domains":[{"cath_id":"3.30.200.20","chopping":"3-81","consensus_level":"high","plddt":90.7419,"start":3,"end":81},{"cath_id":"1.10.510.10","chopping":"84-283","consensus_level":"high","plddt":91.2305,"start":84,"end":283}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UPZ9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UPZ9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UPZ9-F1-predicted_aligned_error_v6.png","plddt_mean":60.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CILK1","jax_strain_url":"https://www.jax.org/strain/search?query=CILK1"},"sequence":{"accession":"Q9UPZ9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UPZ9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UPZ9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UPZ9"}},"corpus_meta":[{"pmid":"24797473","id":"PMC_24797473","title":"ICK 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blot, RNA in situ hybridization\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — initial cloning and characterization, dual phosphorylation site identified by sequence analysis and localization by in situ hybridization, single lab\",\n      \"pmids\": [\"10699974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ICK promotes activation of mTOR complex 1 (mTORC1) by directly phosphorylating Raptor at Thr-908; ICK can phosphorylate Raptor both in vitro and in vivo, and expression of Raptor T908A mutant markedly impairs mTORC1 activation by insulin or RheB under nutrient starvation.\",\n      \"method\": \"In vitro kinase assay, mass spectrometry, phospho-specific antibody, co-immunoprecipitation, site-directed mutagenesis (T908A)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay, mass spectrometry identification of phosphosite, phospho-specific antibody validation, mutagenesis rescue experiment, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"22356909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ICK localizes to the tip of cilia and is essential for ciliary transport; loss of ICK in mice causes accumulation of IFT-A, IFT-B, and BBSome components at ciliary tips, while overexpression induces IFT-B (but not IFT-A or BBSome) accumulation at tips; ICK directly phosphorylates Kif3a, and inhibition of this phosphorylation affects ciliary formation.\",\n      \"method\": \"ICK-deficient mouse model, immunolocalization, live imaging, in vitro kinase assay (Kif3a phosphorylation), overexpression experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — loss-of-function mouse model with defined IFT phenotype, direct in vitro kinase assay establishing Kif3a as substrate, multiple orthogonal methods\",\n      \"pmids\": [\"24797473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ICK and MOK localize to cilia of renal epithelial cells and negatively regulate cilium length; ICK is transported as part of or by the IFT machinery (moves at ~0.45 µm/s similar to IFT proteins); ICK knockdown increases anterograde IFT velocities while overexpression reduces retrograde IFT speed; effects on cilia length and IFT are suppressed by rapamycin, implicating the mTORC1 pathway.\",\n      \"method\": \"Live fluorescence imaging of GFP-tagged IFT proteins, siRNA knockdown, overexpression, rapamycin treatment, velocity measurements\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live imaging with direct velocity measurements, loss- and gain-of-function experiments, pathway suppression with rapamycin, multiple orthogonal approaches\",\n      \"pmids\": [\"25243405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A missense mutation p.E80K in ICK abolishes serine/threonine kinase activity, resulting in altered ICK subcellular and ciliary localization, increased cilia length, aberrant cartilage growth plate structure, and defective Hedgehog and altered ERK signaling; ICK kinase activity is thus required for normal Hedgehog signaling and skeletogenesis.\",\n      \"method\": \"Exome sequencing of patient cohort, in vitro kinase activity assay of E80K mutant, immunofluorescence localization, patient fibroblast analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — kinase activity abolished confirmed by direct assay, linked to ciliary localization changes and Hedgehog pathway defects, multiple methods in one study\",\n      \"pmids\": [\"27466187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ICK mutations (p.R272Q and p.G120C) cause ECO syndrome; mutant ICK proteins mislocalize to the ciliary tip rather than distributing along the axoneme/ciliary base as wild-type ICK does; cells from affected individuals show decreased ciliation, confirming ICK regulates ciliogenesis.\",\n      \"method\": \"Homozygosity mapping, whole-exome sequencing, mRFP-ICK expression (wild-type and mutant), immunocytochemistry of patient fibroblasts\",\n      \"journal\": \"Cilia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization comparison of WT vs mutant proteins, patient-derived cell analysis, two orthogonal methods, single lab\",\n      \"pmids\": [\"27069622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ICK regulates intraflagellar transport (IFT) at the tip of kinocilia in inner ear hair cells; loss of Ick leads to abnormal ciliary localization of IFT component Ift88, planar cell polarity (PCP) defects including misorientation of stereocilia and aberrant kinocilium localization, and auditory dysfunction.\",\n      \"method\": \"Conditional Ick knockout mice, immunofluorescence (Ift88 localization), auditory function tests (ABR), confocal microscopy of stereocilia\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse with defined IFT and PCP phenotypes, direct immunolocalization, functional hearing assay, multiple orthogonal readouts\",\n      \"pmids\": [\"28115485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The C-terminal non-catalytic domain (CTD) of ICK/CAPK is required for substrate recognition and phosphorylation of KIF3A; CTD truncation impairs both KIF3A phosphorylation and localization of ICK to the primary cilium, and eliminates negative regulation of ciliogenesis.\",\n      \"method\": \"CTD truncation mutants, in vitro kinase assay (KIF3A phosphorylation), immunofluorescence localization, ciliation rate quantification\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple deletion constructs tested, kinase assay, localization and ciliation phenotype, single lab\",\n      \"pmids\": [\"31277411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ICK/CILK1 is transported anterogradely to the ciliary tip via direct interaction of its C-terminal non-catalytic region with the IFT-B complex; ICK undergoes bidirectional movement within cilia at velocities similar to IFT particles; ICK deficiency severely impairs retrograde IFT trafficking and causes ciliary proteins and IFT components to accumulate at the bulged ciliary tip, which can be released as extracellular vesicles; IFT-dependent transport of ICK, its kinase activity, and TDY motif phosphorylation are all required for ICK function.\",\n      \"method\": \"Co-immunoprecipitation (ICK C-terminal domain with IFT-B complex), total internal reflection fluorescence (TIRF) microscopy of ICK movement, ICK knockout cell analysis, exogenous expression of ICK constructs in KO cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct Co-IP establishing IFT-B binding, TIRF live imaging of bidirectional movement, KO rescue experiments with multiple ICK constructs, multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"32732286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"JME pathogenic mutations in the CILK1 N-terminal kinase domain abolish kinase activity and eliminate phosphorylation of KIF3A at Thr672; JME mutations in the C-terminal non-catalytic domain (CTD) retain kinase activity but lose ability to restrict cilia length, promote ciliogenesis, and shift localization from the ciliary base to the entire axoneme.\",\n      \"method\": \"In vitro kinase assay (KIF3A-Thr672 phosphorylation), immunofluorescence localization, cilia length measurements, ciliation rate quantification\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase activity directly measured, localization and cilia phenotype assessed, multiple JME mutations analyzed, single lab\",\n      \"pmids\": [\"32178256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Eliminating Kif3a Thr674 phosphorylation by Cilk1 (via T674A knock-in mouse) is insufficient to reproduce the severe developmental defects caused by Cilk1 loss of function, indicating that KIF3A-Thr672 phosphorylation is not essential for tissue development and that other CILK1 substrates mediate ciliopathy phenotypes.\",\n      \"method\": \"Kif3a T674A knock-in mouse model, skeletal analysis, MEF ciliation assay, cilia length measurement\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo phosphorylation site knock-in mouse, multiple tissue and cellular phenotype readouts; negative result mechanistically informative, single lab\",\n      \"pmids\": [\"32935890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BROMI/TBC1D32 interacts with CCRK/CDK20, which phosphorylates and activates ICK/CILK1; BROMI also interacts with FAM149B1/JBTS36 and CFAP20; CCRK-KO, BROMI-KO, and FAM149B1-KO cells all show abnormally long cilia and accumulation of IFT machinery and ICK at the ciliary tip, placing CCRK upstream of ICK in a signaling axis that regulates IFT turnaround at the ciliary tip.\",\n      \"method\": \"Co-immunoprecipitation, knockout cell analysis (CCRK-KO, BROMI-KO, FAM149B1-KO), rescue experiments with BROMI mutants defective in CCRK binding, immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, multiple KO cell lines with concordant phenotypes, domain-specific binding mutant rescue experiments, multiple orthogonal methods\",\n      \"pmids\": [\"35609210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Alvocidib potently inhibits CILK1 kinase activity (IC50 = 20 nM) and induces CILK1-dependent cilia elongation, demonstrating pharmacological inhibition of CILK1 modulates primary cilia length.\",\n      \"method\": \"In vitro kinase inhibition assay (IC50 determination), cilia length measurements in cells treated with Alvocidib vs. CILK1 KO cells\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct kinase inhibition assay with IC50, cellular cilia elongation phenotype showing CILK1-dependence, single lab\",\n      \"pmids\": [\"35897693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLC3 (kinesin light chain-3) interacts with CILK1 at cilia bases; in CILK1-deficient cells, KLC3 is upregulated and its overexpression promotes ciliary recruitment of IFT-B and EGFR, contributing to cystic defects; reduction of KLC3 rescues ciliary defects and inhibits cyst progression in CILK1-deficient kidneys.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, immunocytochemistry, conditional Cilk1 KO mice, KLC3 knockdown rescue experiments\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus co-IP for interaction, KO mouse model, KLC3 KD rescue; mechanistic pathway placement, single lab\",\n      \"pmids\": [\"35961787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KATNIP (katanin-interacting protein/KIAA0556) co-localizes with CILK1 at the basal body; the CILK1 C-terminal intrinsically disordered region (IDR) mediates binding to KATNIP; KATNIP binding drastically elevates CILK1 protein levels and TDY motif phosphorylation (activation), increases phosphorylation of CILK1 substrates, and suppresses cilia length, establishing KATNIP as a regulatory scaffold that potentiates CILK1 function.\",\n      \"method\": \"Co-immunoprecipitation, deletion analysis of CILK1 IDR and KATNIP DUF domains, immunofluorescence colocalization, CILK1 substrate phosphorylation assays, cilia length measurement\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal domain deletion analysis plus Co-IP, TDY phosphorylation and substrate phosphorylation assays, cilia phenotype, multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"37665596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CCRK kinase is an upstream activator of both Mak and Ick in retinal photoreceptor cells; Mak and Ick cooperatively regulate IFT at ciliary tips; simultaneous disruption of Mak and Ick causes loss of photoreceptor ciliary axonemes and severe retinal degeneration; gene delivery of Ick ameliorates retinal degeneration in Mak-deficient mice; FGF receptors act as negative regulators of Ick.\",\n      \"method\": \"Conditional double-KO mouse model (Mak and Ick), AAV-mediated Ick gene delivery rescue, FGF receptor inhibitor treatment, retinal histology, in vivo epistasis analysis\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in vivo (double KO), gene delivery rescue, pharmacological inhibition of upstream regulator, multiple functional readouts in mouse model\",\n      \"pmids\": [\"39293864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A JME-associated CILK1 A615T variant (in the C-terminal IDR) compromises KATNIP-mediated regulation of CILK1; MEFs with the A612T knock-in allele (heterozygous or homozygous) show higher ciliation rate, shorter cilia, and upregulation of ciliary Hedgehog signaling; the CILK1 A615T mutant protein is not elevated by KATNIP co-expression to the same extent as wild-type CILK1.\",\n      \"method\": \"Knock-in mouse model (A612T), MEF analysis, immunofluorescence (ciliation rate, cilia length), Hedgehog signaling readout, co-expression with KATNIP\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knock-in mouse model with cellular phenotype, KATNIP co-expression experiment, multiple cilia readouts, single lab\",\n      \"pmids\": [\"39120290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KATNIP disease variants that truncate near the C-terminus (M1474C) bind to CILK1 but do not support TDY activating phosphorylation in CILK1, phosphorylation of CILK1 substrates, or restriction of cilia length and ciliation rate; residues 1524-1573 of KATNIP (predicted β-sheets and α-helix) are essential for CILK1 activation, separating KATNIP's binding and activation functions for CILK1.\",\n      \"method\": \"KATNIP deletion constructs, Co-immunoprecipitation, TDY phosphorylation assay, CILK1 substrate phosphorylation assay, cilia length and ciliation rate quantification\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain deletion analysis distinguishes binding vs activation, direct TDY phosphorylation and substrate phosphorylation assays, cilia phenotype, single lab\",\n      \"pmids\": [\"40621737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A homozygous frameshift variant in the CILK1 non-catalytic C-terminal domain causes cranioectodermal dysplasia; patient-derived cells show reduced cilia number, increased cilia length, and disrupted IFT component localization; the CILK1 variant protein retains correct ciliary localization; reintroduction of wild-type CILK1 rescues the majority of ciliary defects.\",\n      \"method\": \"Patient-derived cell analysis, C. elegans model, immunofluorescence (cilia number/length, IFT localization), rescue by CILK1 re-expression\",\n      \"journal\": \"European journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient cell functional analysis, model organism confirmation, rescue by re-expression, single lab\",\n      \"pmids\": [\"40615527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In C. elegans, absence of DYF-5 (CILK1 homolog) causes accumulation of IFT components at the ciliary tip, loss of restriction of kinesin-II to the proximal ciliary segment, reduced IFT train frequency (especially retrograde trains), and impaired retrograde transport leading to depletion of IFT components at the ciliary base and impeded anterograde train assembly; DYF-5/CILK1 thus regulates IFT train turnaround at the ciliary tip.\",\n      \"method\": \"Fluorescence imaging and single-molecule tracking in live C. elegans phasmid cilia, IFT velocity and frequency measurements in dyf-5 null mutants\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-molecule live imaging with quantitative measurements in loss-of-function model, consistent with mammalian CILK1 data; preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2024.09.11.612404\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"CILK1 (ICK) is a conserved serine/threonine MAP kinase-like kinase that localizes to the ciliary tip via anterograde IFT-B-mediated transport, where its kinase activity (activated by upstream CCRK phosphorylation of the TDY motif and potentiated by the scaffold protein KATNIP) is required to regulate IFT train turnaround—promoting retrograde transport and preventing accumulation of IFT-A, IFT-B, and BBSome components at the tip; it phosphorylates substrates including KIF3A and Raptor (activating mTORC1), controls cilia length and ciliogenesis through its C-terminal intrinsically disordered region, and is essential for Hedgehog signaling, planar cell polarity, and normal development, with loss-of-function mutations causing multiple ciliopathies.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CILK1 (ICK) is a conserved serine/threonine kinase of the MAP kinase-like family that localizes to the tip of cilia and governs intraflagellar transport (IFT) train turnaround during ciliogenesis [#2, #3]. It is delivered anterogradely to the ciliary tip through direct binding of its C-terminal non-catalytic region to the IFT-B complex, moving bidirectionally at IFT-particle velocities; loss of CILK1 impairs retrograde IFT and causes IFT-A, IFT-B, and BBSome components to accumulate at a bulged ciliary tip, with kinase activity, TDY-motif phosphorylation, and IFT-dependent transport all required for function [#2, #8]. CILK1 directly phosphorylates KIF3A (at Thr672/Thr674), but ablating this single site is insufficient to reproduce CILK1-loss developmental defects, indicating additional substrates mediate ciliopathy phenotypes [#2, #9, #10]; it also phosphorylates Raptor at Thr908 to activate mTORC1, and its control of cilia length acts through the mTORC1 pathway [#1, #3]. CILK1 activity is set by an upstream CCRK/CDK20 axis—scaffolded by BROMI/TBC1D32—that phosphorylates and activates the kinase, and is further potentiated by KATNIP, which binds the CILK1 C-terminal intrinsically disordered region to elevate CILK1 protein levels, TDY-motif phosphorylation, substrate phosphorylation, and cilia-length restriction [#11, #14, #17]. Through these activities CILK1 is essential for Hedgehog signaling, planar cell polarity, and skeletal and sensory development [#4, #6, #16]. Loss-of-function and C-terminal variants of CILK1 cause multiple human ciliopathies, including a skeletal/Hedgehog disorder, ECO syndrome, juvenile myoclonic epilepsy, and cranioectodermal dysplasia [#4, #5, #9, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established CILK1/ICK as a distinct serine/threonine kinase carrying a MAP-kinase-type dual-phosphorylation (TXY) activation motif, defining the molecular class of the enzyme before any cellular role was known.\",\n      \"evidence\": \"PCR cloning from intestinal crypt cDNA, Northern blot, in situ hybridization\",\n      \"pmids\": [\"10699974\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No substrate or pathway identified\", \"Ciliary role not yet recognized\", \"Activation mechanism of the TXY/TDY motif unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the first direct substrate, showing CILK1 phosphorylates Raptor at Thr908 to enable mTORC1 activation, linking the kinase to nutrient/growth signaling.\",\n      \"evidence\": \"In vitro kinase assay, mass spectrometry, phospho-specific antibody, T908A mutagenesis rescue\",\n      \"pmids\": [\"22356909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Connection between mTORC1 regulation and cilia not yet drawn\", \"Physiological context of Raptor phosphorylation in vivo unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined CILK1's core cellular role: it localizes to the ciliary tip, is required for IFT, and phosphorylates KIF3A, with loss causing accumulation of IFT-A, IFT-B, and BBSome at tips—and showed its ciliary effects involve the mTORC1 pathway.\",\n      \"evidence\": \"ICK-deficient mouse, immunolocalization, live imaging, in vitro KIF3A kinase assay; separate live IFT velocity imaging with rapamycin suppression\",\n      \"pmids\": [\"24797473\", \"25243405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of tip recruitment not yet defined\", \"Whether KIF3A phosphorylation is the relevant in vivo substrate untested\", \"How mTORC1 and IFT control intersect mechanistically unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected CILK1 kinase activity to human disease and developmental signaling, showing kinase-dead mutations alter ciliary localization, lengthen cilia, and disrupt Hedgehog signaling and skeletogenesis, and that distinct mutations cause ECO syndrome with ciliogenesis defects.\",\n      \"evidence\": \"Exome sequencing of patients, in vitro kinase assays of E80K, patient fibroblast localization; homozygosity mapping and WT/mutant mRFP-ICK localization for ECO syndrome\",\n      \"pmids\": [\"27466187\", \"27069622\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hedgehog defect downstream effectors not identified\", \"Relationship between localization shift and signaling loss not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended CILK1's IFT-regulatory role to sensory tissue and planar cell polarity, showing kinocilia of hair cells require Ick for correct IFT88 localization, stereocilia orientation, and hearing.\",\n      \"evidence\": \"Conditional Ick knockout mice, IFT88 immunofluorescence, ABR auditory tests, confocal stereocilia imaging\",\n      \"pmids\": [\"28115485\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between IFT regulation and PCP unestablished\", \"Substrate mediating PCP effects unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Dissected the domain architecture, demonstrating the C-terminal non-catalytic domain is required for KIF3A substrate recognition, ciliary localization, and negative regulation of ciliogenesis—separating catalysis from targeting.\",\n      \"evidence\": \"CTD truncation mutants, in vitro KIF3A kinase assay, immunofluorescence, ciliation quantification\",\n      \"pmids\": [\"31277411\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding partner mediating CTD-dependent localization not yet identified\", \"Single-lab construct study\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved how CILK1 reaches and acts at the tip: its C-terminal region binds IFT-B for anterograde delivery, and its kinase activity is needed for retrograde IFT turnaround—while a KIF3A phospho-site knock-in showed that single substrate is not sufficient to explain developmental phenotypes, and JME mutations split into kinase-dead versus localization/length-control classes.\",\n      \"evidence\": \"Co-IP of CILK1 CTD with IFT-B, TIRF live imaging, KO rescue; Kif3a T674A knock-in mouse; in vitro KIF3A-Thr672 assays with JME mutants\",\n      \"pmids\": [\"32732286\", \"32935890\", \"32178256\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the additional CILK1 substrates driving development unknown\", \"Direct IFT-B subunit contacted not pinpointed\", \"How CTD mutations alter axonemal distribution mechanistically unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placed CILK1 within an upstream activation axis and identified additional partners, showing CCRK/CDK20 (scaffolded by BROMI/TBC1D32) phosphorylates and activates CILK1 to control tip IFT turnaround, and that KLC3 binds CILK1 at cilia bases to modulate IFT-B/EGFR recruitment in kidney; pharmacological inhibition (Alvocidib) confirmed CILK1-dependent cilia elongation.\",\n      \"evidence\": \"Reciprocal Co-IP and multiple KO cell lines (CCRK, BROMI, FAM149B1); yeast two-hybrid + Co-IP and conditional Cilk1 KO mice for KLC3; in vitro IC50 kinase inhibition assay\",\n      \"pmids\": [\"35609210\", \"35961787\", \"35897693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct CCRK phosphosite on CILK1 within this axis not mapped here\", \"Whether KLC3 effects are kinase-dependent unclear\", \"Off-target profile of Alvocidib not addressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified KATNIP as a regulatory scaffold that potentiates CILK1, showing its binding to the CILK1 C-terminal IDR elevates CILK1 levels, TDY-motif and substrate phosphorylation, and restricts cilia length.\",\n      \"evidence\": \"Co-IP, reciprocal domain deletion of CILK1 IDR and KATNIP DUF domains, TDY/substrate phosphorylation assays, cilia length measurement\",\n      \"pmids\": [\"37665596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether KATNIP stabilizes CILK1 directly or via reduced turnover unclear\", \"Relationship between KATNIP and CCRK activation pathways unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated functional cooperation and disease relevance: CCRK activates both Mak and Ick to co-regulate photoreceptor tip IFT with FGF receptors as negative regulators, and a JME-associated IDR variant (A615T) selectively impairs KATNIP-mediated CILK1 regulation, deregulating Hedgehog signaling.\",\n      \"evidence\": \"Conditional Mak/Ick double-KO mice with AAV-Ick rescue and FGFR inhibition; A612T knock-in MEF analysis with KATNIP co-expression and Hedgehog readouts\",\n      \"pmids\": [\"39293864\", \"39120290\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of FGFR-mediated negative regulation unmapped\", \"How A615T alters KATNIP binding versus stabilization not fully resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined the KATNIP activation mechanism and broadened the disease spectrum, showing a C-terminal KATNIP residue stretch (1524-1573) is required to activate CILK1 (separating binding from activation), and a C-terminal frameshift CILK1 variant causes cranioectodermal dysplasia with rescuable ciliary defects.\",\n      \"evidence\": \"KATNIP deletion constructs with TDY/substrate phosphorylation and cilia assays; patient-derived cells, C. elegans model, and CILK1 re-expression rescue\",\n      \"pmids\": [\"40621737\", \"40615527\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of KATNIP-mediated activation not solved\", \"Single-lab disease cohorts\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The full set of physiologically relevant CILK1 substrates beyond KIF3A and Raptor that drive Hedgehog, PCP, and developmental phenotypes remains unidentified.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No substrate proven to mediate the developmental ciliopathy phenotypes\", \"Direct molecular mechanism converting tip kinase activity into IFT turnaround unresolved\", \"No structure of CILK1 in complex with KATNIP or IFT-B\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 7, 9]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [2, 3, 5, 8]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2, 3, 8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 6, 16]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 8, 19]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"KATNIP\", \"CCRK\", \"IFT-B\", \"KIF3A\", \"RPTOR\", \"KLC3\", \"TBC1D32\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}