{"gene":"IFT88","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2000,"finding":"IFT88 (Chlamydomonas) and its mouse homologue Tg737 are required for assembly of cilia and flagella; loss of IFT88 in Chlamydomonas results in complete absence of flagella, and Tg737 mutant mice have shorter primary cilia in kidney tubular cells, establishing IFT88 as an essential component of intraflagellar transport for ciliogenesis.","method":"Insertional mutant characterization in Chlamydomonas, mouse mutant analysis, electron microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — foundational genetic loss-of-function with clear ciliary phenotype, replicated across two organisms, highly cited","pmids":["11062270"],"is_preprint":false},{"year":2001,"finding":"The C. elegans IFT88 ortholog OSM-5 localizes to the cilium base and axoneme, undergoes intraflagellar transport as visualized by time-lapse imaging of OSM-5::GFP, and is required for ciliogenesis in sensory neurons; its expression is regulated by the RFX transcription factor DAF-19.","method":"Transgenic rescue, GFP fusion live imaging, immunofluorescence","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — direct live imaging of IFT particle movement, transgenic rescue, multiple methods","pmids":["11290289"],"is_preprint":false},{"year":2002,"finding":"IFT88/Tg737 is required for photoreceptor outer segment assembly and maintenance; IFT particle proteins localize to photoreceptor connecting cilia, and mice with Tg737/IFT88 mutation develop abnormal outer segment morphology and retinal degeneration.","method":"Mouse mutant analysis, immunolocalization, histology","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype plus direct localization, highly cited","pmids":["11916979"],"is_preprint":false},{"year":2007,"finding":"IFT88/polaris localizes to the centrosome throughout the cell cycle in a microtubule- and dynein-independent manner via its tetratricopeptide repeat (TPR) motifs; overexpression prevents G1-S transition and induces apoptosis, depletion by RNAi promotes cell-cycle progression, and IFT88 interacts with Che-1 (an Rb-binding protein), placing IFT88 in G1-S regulation in non-ciliated proliferating cells.","method":"Cell fractionation, RNAi knockdown, overexpression, Co-IP, cell cycle analysis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including Co-IP, localization, and functional cell-cycle readout in a single study","pmids":["17264151"],"is_preprint":false},{"year":2010,"finding":"IFT88, IFT52, and IFT46 directly interact with each other and form a ternary complex within the IFT-B core; interactions were established by yeast two-hybrid and bacterial coexpression/pulldown, and confirmed by chemical cross-linking.","method":"Yeast two-hybrid, bacterial coexpression pulldown, chemical cross-linking","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro reconstitution of protein interactions with multiple orthogonal methods","pmids":["20435895"],"is_preprint":false},{"year":2011,"finding":"IFT88 depletion induces mitotic spindle orientation defects; in mitosis IFT88 is part of a dynein1-driven complex that transports peripheral microtubule clusters containing microtubule-nucleating proteins to spindle poles, ensuring proper astral microtubule array formation and spindle orientation.","method":"siRNA knockdown in human cells, mouse mutant kidney cells, zebrafish embryos; live imaging; Co-IP","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple organisms, reciprocal Co-IP, defined mechanistic phenotype, highly cited","pmids":["21441926"],"is_preprint":false},{"year":2011,"finding":"IFT88 localizes to the trans-Golgi network of spermatids and participates in acrosome-acroplaxome complex, head-tail coupling apparatus, and spermatid tail biogenesis; loss of Ift88 causes abnormal head shaping and tail-less spermatids, and disruption of microtubules blocks progression of IFT88-stained proacrosomal vesicles to the acrosome.","method":"Immunocytochemistry, mouse mutant analysis (Ift88 mutant), Brefeldin-A and nocodazole treatment","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization with functional consequence in mutant, single lab","pmids":["21337470"],"is_preprint":false},{"year":2013,"finding":"IFT88 plays a cilia- and PCP-independent role in controlling oriented cell divisions during zebrafish gastrulation and neurulation; maternal+zygotic IFT88 mutant embryos lacking all cilia show oriented cell division defects without PCP phenotypes.","method":"Maternal+zygotic zebrafish mutant analysis, live imaging, cell division orientation measurements","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — rigorous genetic epistasis using MZ mutants with defined cellular phenotype","pmids":["24095732"],"is_preprint":false},{"year":2015,"finding":"IFT88 is required for cell migration independently of cilia; loss of Ift88 impairs polarization of migrating MDCK cells and reduces microtubule content at the leading edge, without affecting MT dynamics or nucleation.","method":"siRNA/shRNA knockdown, live cell imaging, fluorescence microscopy of migrating cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined cellular phenotype, single lab, cilia-independence established","pmids":["26465598"],"is_preprint":false},{"year":2015,"finding":"IFT88 regulates actin organization and cortical stiffness in chondrocytes; hypomorphic IFT88(orpk) cells show increased acto-myosin stress fibers, reduced cortical tension, slower actin cortex reformation after blebbing, and altered cell mechanical properties.","method":"Confocal microscopy, micropipette aspiration, live cell actin imaging with LifeACT-GFP","journal":"Osteoarthritis and cartilage","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional and mechanical measurements, single lab","pmids":["26493329"],"is_preprint":false},{"year":2017,"finding":"DGKδ (a diacylglycerol kinase resident in the ER) triggers release of IFT88-containing vesicles from ER exit sites (ERES) via interaction with IFT88; IFT88 associates with COPII-coated vesicles at ERES, and DGKδ is required for Shh signaling in vitro and in vivo.","method":"Co-IP, RNAi silencing, gene knockout, vesicle trafficking assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP interaction plus functional rescue, single lab","pmids":["28706295"],"is_preprint":false},{"year":2018,"finding":"IFT70 interacts with the IFT52-IFT88 dimer via its first TPR domain and terminal helix; deletion of either disrupts IFT70-IFT52-IFT88 interaction and abolishes ciliogenesis in IFT70-KO cells.","method":"Knockout cell lines, co-immunoprecipitation, deletion mutagenesis, ciliogenesis rescue assay","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of interaction domain combined with KO rescue and Co-IP","pmids":["29654116"],"is_preprint":false},{"year":2018,"finding":"TCTN2 depletion causes IFT88 to leak into the basal body lumen rather than entering the cilium, demonstrating that the transition zone gates IFT88 access to the ciliary compartment.","method":"CRISPR/Cas9 knockout, super-resolution microscopy, quantitative localization analysis","journal":"Biophysical journal","confidence":"Medium","confidence_rationale":"Tier 2 — super-resolution imaging with quantitative spatial analysis, single lab","pmids":["29866362"],"is_preprint":false},{"year":2018,"finding":"IFT88 regulates LRP-1-mediated endocytosis of extracellular proteases in chondrocytes; hypomorphic IFT88 mutation disrupts LRP-1 concentration at the ciliary base, increases receptor shedding, and reduces protease clearance, elevating aggrecanase activity independently of Hedgehog signaling.","method":"Hypomorphic mutant chondrocyte line, immunofluorescence, protease activity assays, receptor shedding assay","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — KO/mutation with defined mechanistic pathway, single lab","pmids":["29920219"],"is_preprint":false},{"year":2019,"finding":"IFT88 concentrates at kinetochore fiber (k-fiber) minus-ends, interacts with NuMA, and is required for NuMA enrichment at newly generated k-fiber minus-ends after laser ablation; IFT88 depletion impairs k-fiber re-anchoring into spindles and chromosome alignment.","method":"MT laser ablation, siRNA depletion, Co-IP, nocodazole washout, immunofluorescence","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — Co-IP interaction, laser ablation functional assay, multiple mechanistic readouts","pmids":["31312011"],"is_preprint":false},{"year":2020,"finding":"WDR62 recruits CPAP to the basal body, which is required for subsequent recruitment of IFT88; WDR62 missense mutations (V66M, R439H) localize to the basal body but fail to recruit CPAP, resulting in IFT88 deficiency, ciliogenesis failure, and premature radial glia differentiation leading to microcephaly.","method":"CRISPR/Cas9 mouse models, immunofluorescence co-localization, loss-of-function analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis (WDR62→CPAP→IFT88) with defined developmental phenotype, single lab","pmids":["31816041"],"is_preprint":false},{"year":2020,"finding":"Loss of IFT88 in endothelial cells promotes endothelial-to-mesenchymal transition (EndMT), increases Sonic Hedgehog signaling effectors, and in vivo endothelial-specific Ift88 KO exacerbates bleomycin-induced pulmonary fibrosis.","method":"siRNA knockdown in ECs, endothelial-specific Ift88 KO mice, marker expression analysis, bleomycin fibrosis model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with defined fibrosis phenotype, mechanistic marker analysis, single lab","pmids":["32161282"],"is_preprint":false},{"year":2022,"finding":"MEIG1 is required for manchette localization of IFT88 and IFT20 in elongating spermatids; Co-IP from mouse testis confirms MEIG1-IFT88-IFT20 complex, and in Meig1 KO mice IFT88 is absent from the manchette and drifts to lighter sucrose gradient fractions, indicating MEIG1 stabilizes IFT88 in this compartment.","method":"Co-immunoprecipitation, Meig1 KO mouse, sucrose gradient sedimentation, immunofluorescence","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP combined with KO mouse and sedimentation assay, multiple orthogonal methods","pmids":["35257720"],"is_preprint":false},{"year":2024,"finding":"XIAP functions as an E3 ubiquitin ligase for IFT88; TGF-β enhances XIAP-mediated ubiquitination of IFT88, promoting its proteasomal degradation, cilia loss, and HSC activation leading to liver fibrosis. Blocking XIAP-mediated IFT88 degradation prevents TGF-β-induced HSC activation.","method":"Co-IP, ubiquitination assay, Ift88 KO mice, liver fibrosis model, proteasome inhibition","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — writer (XIAP) identified via Co-IP and ubiquitination assay, in vivo KO validation, multiple orthogonal methods","pmids":["38351372"],"is_preprint":false},{"year":2025,"finding":"UFL1-mediated UFMylation of IFT88 at lysine 572 antagonizes ubiquitination by PJA2 E3 ligase, preventing IFT88 proteasomal degradation; the K572R IFT88 mutant shows increased ubiquitination and reduced stability, and UFL1 KO mice have severe ciliary defects.","method":"Co-IP, site-directed mutagenesis, UFL1 KO mouse, proteasome inhibition, UFMylation assay","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1 — site-specific mutagenesis of modification site, identification of writer (UFL1) and eraser (PJA2), in vivo validation","pmids":["41272290"],"is_preprint":false},{"year":2025,"finding":"IFT88 inhibits TRPV4-mediated calcium influx in endplate chondrocytes under excessive mechanical stress; co-immunoprecipitation shows IFT88-TRPV4 interaction, and IFT88 negatively regulates its own transcription factor C/EBPα under abnormal stress. IFT88 overexpression in vivo maintains disc height and reduces endplate ossification.","method":"Co-immunoprecipitation, dual-luciferase assay, molecular docking, siRNA knockdown, in vivo AAV overexpression, flow cytometry","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP interaction with TRPV4, functional in vivo rescue, single lab","pmids":["40441296"],"is_preprint":false},{"year":2012,"finding":"Deletion of Ift88 from chondrocytes disrupts Hedgehog (Ihh) signaling and downregulates the Wnt antagonist Sfrp5 (a downstream Hh target), leading to increased Wnt/β-catenin signaling specifically in columnar growth plate cells.","method":"Conditional Ift88 knockout mice, gene expression profiling, pathway analysis, immunohistochemistry for nuclear β-catenin","journal":"Journal of orthopaedic research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis via conditional KO with pathway-level mechanistic readout, single lab","pmids":["23034798"],"is_preprint":false},{"year":2017,"finding":"Loss of Tg737 in liver stem cells results in nuclear β-catenin accumulation and activation of the Wnt/β-catenin pathway, promoting EMT via a Snail-HNF4α negative feedback circuit; XAV939 (β-catenin inhibitor) rescues the malignant transformation phenotype.","method":"shRNA knockdown, pathway inhibitor rescue, β-catenin nuclear localization, Western blot","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 — KD with pharmacological rescue establishing pathway position, single lab","pmids":["28536011"],"is_preprint":false},{"year":2019,"finding":"Ift88 is required in cranial neural crest cells for craniofacial/mandibular development partially through Sonic Hedgehog signaling; loss of Ift88 in mandibular mesenchyme downregulates Hh signaling, but Ift88 also affects chondrogenesis independently as Smo deletion shows distinct phenotype.","method":"Conditional Ift88 KO (Wnt1Cre), Smo conditional KO comparison, histology, in situ hybridization","journal":"Journal of anatomy","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis via parallel conditional KOs, single lab","pmids":["31657471"],"is_preprint":false},{"year":2017,"finding":"IFT88 loss in cranial neural crest-derived palatal mesenchyme abolishes primary cilia and downregulates Shh signaling, leading to bilateral cleft lip and palate; palatal mesenchyme-specific Ift88 deletion recapitulates isolated cleft palate.","method":"Wnt1-Cre and Osr2KI-Cre conditional Ift88 KO mice, cilia immunostaining, Shh pathway analysis, proliferation assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — two independent Cre drivers establishing cell-autonomous requirement, defined pathway placement","pmids":["28069795"],"is_preprint":false}],"current_model":"IFT88 is a core subunit of the IFT-B complex that directly interacts with IFT52 and IFT46 to form a ternary scaffold; it is transported bidirectionally along ciliary microtubules and is essential for ciliogenesis in virtually all ciliated cell types, where it mediates anterograde cargo delivery (including photoreceptor outer segment proteins and Hedgehog pathway components); outside the cilium, IFT88 associates with the centrosome via its TPR motifs, participates in dynein1-driven transport of microtubule-nucleating factors to spindle poles to orient cell division, concentrates at kinetochore fiber minus-ends to recruit NuMA, regulates cell migration by maintaining leading-edge microtubules, controls G1-S transition by interacting with the Rb-regulator Che-1, and is subject to post-translational regulation by XIAP-mediated ubiquitination (promoted by TGF-β) and UFL1-mediated UFMylation (which protects IFT88 from proteasomal degradation), collectively linking ciliary homeostasis to cell proliferation, fibrosis, and developmental signaling."},"narrative":{"teleology":[{"year":2000,"claim":"Establishing IFT88 as essential for ciliogenesis resolved the question of which IFT particle subunits are individually required for cilium assembly, showing that loss of a single IFT-B component abolishes flagella/cilia across species.","evidence":"Insertional mutagenesis in Chlamydomonas and Tg737 mutant mice with EM and light microscopy","pmids":["11062270"],"confidence":"High","gaps":["Mechanism by which IFT88 contributes to IFT particle integrity not defined","Mammalian null (not hypomorphic) phenotype not yet characterized"]},{"year":2001,"claim":"Direct visualization of IFT88 (OSM-5) undergoing bidirectional transport in living cilia demonstrated that IFT88 is a bona fide cargo of the IFT machinery, not merely a structural requirement.","evidence":"OSM-5::GFP time-lapse imaging in C. elegans sensory neurons with transgenic rescue","pmids":["11290289"],"confidence":"High","gaps":["Speed and processivity of IFT88-containing trains not quantified","Post-translational regulation of IFT88 transport not addressed"]},{"year":2002,"claim":"Demonstrating that IFT88 is required for photoreceptor outer segment assembly extended the ciliary requirement to a specialized sensory structure and linked IFT88 to retinal degeneration.","evidence":"Tg737 mutant mice, immunolocalization to connecting cilium, histological analysis of retinal degeneration","pmids":["11916979"],"confidence":"High","gaps":["Specific outer segment cargoes transported by IFT88 not identified","Whether phenotype is developmental versus maintenance not resolved"]},{"year":2007,"claim":"Discovery of IFT88's centrosomal localization and interaction with the Rb-regulator Che-1 revealed a cilia-independent role in G1–S cell-cycle control, fundamentally expanding IFT88 function beyond ciliogenesis.","evidence":"Cell fractionation, Co-IP of IFT88–Che-1, RNAi and overexpression cell-cycle assays in human cells","pmids":["17264151"],"confidence":"High","gaps":["Direct phosphorylation or modification linking IFT88 to Rb pathway not characterized","Whether Che-1 interaction is TPR-dependent not tested"]},{"year":2010,"claim":"Reconstitution of the IFT88–IFT52–IFT46 ternary complex defined the minimal interaction network within the IFT-B core, answering which subunits directly contact IFT88.","evidence":"Yeast two-hybrid, bacterial coexpression pulldown, and chemical cross-linking","pmids":["20435895"],"confidence":"High","gaps":["Structural basis of the ternary complex not determined at atomic resolution","How the ternary core integrates into the full IFT-B complex not shown"]},{"year":2011,"claim":"Identification of IFT88 in a dynein1-driven complex that delivers microtubule-nucleating factors to spindle poles established a direct mitotic mechanism explaining spindle orientation defects upon IFT88 loss.","evidence":"siRNA in human cells, mouse mutant kidney cells, zebrafish embryos; live imaging and Co-IP","pmids":["21441926"],"confidence":"High","gaps":["Identity of all cargo proteins in the IFT88–dynein1 spindle complex not exhaustive","Whether IFT88's ciliary and mitotic pools are independently regulated is unknown"]},{"year":2012,"claim":"Conditional deletion in chondrocytes revealed that IFT88-dependent cilia transduce Ihh signaling to restrain Wnt/β-catenin activity, placing IFT88 at a signaling crossroads between Hedgehog and Wnt pathways in skeletal development.","evidence":"Conditional Ift88 KO mice, gene expression profiling, nuclear β-catenin immunohistochemistry","pmids":["23034798"],"confidence":"Medium","gaps":["Whether IFT88 directly modulates Wnt pathway components or only indirectly via Hh is unclear","Single tissue context studied"]},{"year":2013,"claim":"Maternal-zygotic IFT88 mutant zebrafish lacking all cilia still displayed oriented cell division defects without PCP phenotypes, formally separating IFT88's mitotic role from both cilia and planar cell polarity.","evidence":"MZ mutant zebrafish, live imaging, division orientation quantification during gastrulation","pmids":["24095732"],"confidence":"High","gaps":["Molecular partners mediating the cilia-independent spindle orientation function in vivo not identified"]},{"year":2015,"claim":"IFT88 was shown to maintain leading-edge microtubule content during cell migration and to regulate actin cortex organization and cortical stiffness, extending its cytoskeletal roles beyond the mitotic spindle.","evidence":"siRNA/shRNA knockdown in migrating MDCK cells; LifeACT-GFP and micropipette aspiration in hypomorphic chondrocytes","pmids":["26465598","26493329"],"confidence":"Medium","gaps":["Mechanism by which IFT88 stabilizes leading-edge microtubules unresolved","Whether actin phenotype is direct or secondary to microtubule defects unknown"]},{"year":2017,"claim":"IFT88 loss in cranial neural crest cells was shown to abolish cilia and Shh signaling, causing cleft lip/palate and mandibular defects, demonstrating tissue-specific developmental consequences of IFT88-dependent Hedgehog transduction.","evidence":"Wnt1-Cre and Osr2KI-Cre conditional Ift88 KO mice, Shh pathway analysis, comparison with Smo KO","pmids":["28069795","31657471"],"confidence":"High","gaps":["Whether IFT88 has Hedgehog-independent roles in palatal mesenchyme not fully dissected"]},{"year":2018,"claim":"Mapping IFT70's interaction to the IFT52–IFT88 dimer and showing that TCTN2 gates IFT88 ciliary entry refined the architecture and spatial regulation of IFT-B at the transition zone.","evidence":"IFT70-KO rescue with deletion mutants, Co-IP; TCTN2 KO super-resolution imaging","pmids":["29654116","29866362"],"confidence":"High","gaps":["Atomic-resolution structure of the IFT70–IFT52–IFT88 sub-complex not yet available","How the transition zone physically gates IFT88 is mechanistically unresolved"]},{"year":2019,"claim":"IFT88's localization at kinetochore-fiber minus-ends and its interaction with NuMA revealed a mechanism for k-fiber re-anchoring during mitosis, explaining chromosome alignment defects upon IFT88 depletion.","evidence":"Laser ablation of k-fibers, siRNA, Co-IP of IFT88–NuMA, immunofluorescence","pmids":["31312011"],"confidence":"High","gaps":["Whether IFT88 is transported along k-fibers or associates statically is unknown","Structural basis of IFT88–NuMA interaction not defined"]},{"year":2022,"claim":"MEIG1 was identified as a spermatid-specific adaptor that recruits IFT88 to the manchette, establishing a tissue-specific IFT88 localization mechanism required for spermiogenesis.","evidence":"Co-IP from mouse testis, Meig1 KO, sucrose gradient sedimentation, immunofluorescence","pmids":["35257720"],"confidence":"High","gaps":["Whether MEIG1 directly binds IFT88 or acts via IFT20 not resolved","Cargo transported by manchette-associated IFT88 not identified"]},{"year":2024,"claim":"Identification of XIAP as an E3 ubiquitin ligase for IFT88, enhanced by TGF-β, established a post-translational degradation axis linking ciliary loss to hepatic stellate cell activation and liver fibrosis.","evidence":"Co-IP, ubiquitination assays, Ift88 KO mice, liver fibrosis model, proteasome inhibition","pmids":["38351372"],"confidence":"High","gaps":["Specific lysine residues ubiquitinated by XIAP not mapped","Whether XIAP-mediated degradation operates in other fibrotic tissues is untested"]},{"year":2025,"claim":"Discovery that UFL1-mediated UFMylation at K572 competes with PJA2-mediated ubiquitination to stabilize IFT88 revealed a dual post-translational switch controlling IFT88 protein levels and ciliary homeostasis.","evidence":"Site-directed K572R mutagenesis, UFL1 KO mice, UFMylation and ubiquitination assays","pmids":["41272290"],"confidence":"High","gaps":["Whether UFMylation regulates IFT88 in specific tissues/cell types is unexplored","Upstream signals triggering UFMylation versus ubiquitination not characterized"]},{"year":null,"claim":"A high-resolution structural model of full-length IFT88 within the intact IFT-B train, the signaling inputs that toggle between UFMylation and ubiquitination, and the mechanism by which IFT88 is partitioned between ciliary and non-ciliary pools remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No atomic structure of IFT88 in the context of the full IFT train","Signals controlling UFMylation/ubiquitination balance unknown","Partitioning mechanism between ciliary and centrosomal/mitotic pools undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,4,11]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[5,8,14]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,2,12]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[3,5,15]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[5,14]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[6]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,2,11,12]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,5,7,14]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[21,22,24]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[15,23,24]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[18,19]}],"complexes":["IFT-B complex","IFT88-IFT52-IFT46 ternary complex"],"partners":["IFT52","IFT46","IFT70","NUMA","CHE-1","XIAP","UFL1","MEIG1"],"other_free_text":[]},"mechanistic_narrative":"IFT88 is a TPR-repeat-containing core subunit of the IFT-B complex that is essential for ciliogenesis across metazoans and functions in multiple cilia-independent processes including mitotic spindle orientation, cell-cycle control, and cell migration. Within the IFT-B complex, IFT88 forms a ternary scaffold with IFT52 and IFT46, undergoes bidirectional intraflagellar transport along the axoneme, and its entry into the ciliary compartment is gated by the transition zone component TCTN2 [PMID:20435895, PMID:11290289, PMID:29866362]. Outside the cilium, IFT88 localizes to the centrosome via its TPR motifs, participates in dynein1-driven transport of microtubule-nucleating factors to spindle poles, concentrates at kinetochore-fiber minus-ends to recruit NuMA for proper chromosome alignment, interacts with the Rb-regulator Che-1 to restrain G1–S progression, and maintains leading-edge microtubules during cell migration [PMID:17264151, PMID:21441926, PMID:31312011, PMID:26465598]. IFT88 protein stability is regulated by competing post-translational modifications: XIAP-mediated ubiquitination (enhanced by TGF-β) targets IFT88 for proteasomal degradation promoting cilia loss and fibrosis, whereas UFL1-mediated UFMylation at Lys572 antagonizes ubiquitination by PJA2 and stabilizes IFT88 [PMID:38351372, PMID:41272290]."},"prefetch_data":{"uniprot":{"accession":"Q13099","full_name":"Intraflagellar transport protein 88 homolog","aliases":["Recessive polycystic kidney disease protein Tg737 homolog","Tetratricopeptide repeat protein 10","TPR repeat protein 10"],"length_aa":824,"mass_kda":93.2,"function":"Positively regulates primary cilium biogenesis (PubMed:17604723). Also involved in autophagy since it is required for trafficking of ATG16L and the expansion of the autophagic compartment","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole; Cell projection, cilium; Cytoplasm, cytoskeleton, cilium basal body; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm; Cell projection, cilium, flagellum; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q13099/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/IFT88","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HSPB11","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/IFT88","total_profiled":1310},"omim":[{"mim_id":"621180","title":"CRANIOECTODERMAL DYSPLASIA 5; 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imaging","date":"2025-08-21","source":"bioRxiv","url":"https://doi.org/10.1101/2025.08.20.670930","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.28.635267","title":"Cholangiocytes’ Primary Cilia Regulate DNA Damage Response and Repair","date":"2025-01-31","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.28.635267","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.12.27.630506","title":"Phototropin localization and interactions regulates photophysiological  processes in<i>Chlamydomonas reinhardtii</i>","date":"2024-12-27","source":"bioRxiv","url":"https://doi.org/10.1101/2024.12.27.630506","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.03.01.640937","title":"MEST inhibits ciliary sphingomyelin synthesis to promote tendon stem/progenitor cells osteochondrogenesis in traumatic heterotopic 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study","date":"2024-10-02","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.02.616263","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":44336,"output_tokens":5517,"usd":0.107882},"stage2":{"model":"claude-opus-4-6","input_tokens":9155,"output_tokens":3754,"usd":0.209437},"total_usd":0.317319,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"IFT88 (Chlamydomonas) and its mouse homologue Tg737 are required for assembly of cilia and flagella; loss of IFT88 in Chlamydomonas results in complete absence of flagella, and Tg737 mutant mice have shorter primary cilia in kidney tubular cells, establishing IFT88 as an essential component of intraflagellar transport for ciliogenesis.\",\n      \"method\": \"Insertional mutant characterization in Chlamydomonas, mouse mutant analysis, electron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — foundational genetic loss-of-function with clear ciliary phenotype, replicated across two organisms, highly cited\",\n      \"pmids\": [\"11062270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The C. elegans IFT88 ortholog OSM-5 localizes to the cilium base and axoneme, undergoes intraflagellar transport as visualized by time-lapse imaging of OSM-5::GFP, and is required for ciliogenesis in sensory neurons; its expression is regulated by the RFX transcription factor DAF-19.\",\n      \"method\": \"Transgenic rescue, GFP fusion live imaging, immunofluorescence\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct live imaging of IFT particle movement, transgenic rescue, multiple methods\",\n      \"pmids\": [\"11290289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"IFT88/Tg737 is required for photoreceptor outer segment assembly and maintenance; IFT particle proteins localize to photoreceptor connecting cilia, and mice with Tg737/IFT88 mutation develop abnormal outer segment morphology and retinal degeneration.\",\n      \"method\": \"Mouse mutant analysis, immunolocalization, histology\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype plus direct localization, highly cited\",\n      \"pmids\": [\"11916979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"IFT88/polaris localizes to the centrosome throughout the cell cycle in a microtubule- and dynein-independent manner via its tetratricopeptide repeat (TPR) motifs; overexpression prevents G1-S transition and induces apoptosis, depletion by RNAi promotes cell-cycle progression, and IFT88 interacts with Che-1 (an Rb-binding protein), placing IFT88 in G1-S regulation in non-ciliated proliferating cells.\",\n      \"method\": \"Cell fractionation, RNAi knockdown, overexpression, Co-IP, cell cycle analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including Co-IP, localization, and functional cell-cycle readout in a single study\",\n      \"pmids\": [\"17264151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"IFT88, IFT52, and IFT46 directly interact with each other and form a ternary complex within the IFT-B core; interactions were established by yeast two-hybrid and bacterial coexpression/pulldown, and confirmed by chemical cross-linking.\",\n      \"method\": \"Yeast two-hybrid, bacterial coexpression pulldown, chemical cross-linking\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro reconstitution of protein interactions with multiple orthogonal methods\",\n      \"pmids\": [\"20435895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IFT88 depletion induces mitotic spindle orientation defects; in mitosis IFT88 is part of a dynein1-driven complex that transports peripheral microtubule clusters containing microtubule-nucleating proteins to spindle poles, ensuring proper astral microtubule array formation and spindle orientation.\",\n      \"method\": \"siRNA knockdown in human cells, mouse mutant kidney cells, zebrafish embryos; live imaging; Co-IP\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple organisms, reciprocal Co-IP, defined mechanistic phenotype, highly cited\",\n      \"pmids\": [\"21441926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IFT88 localizes to the trans-Golgi network of spermatids and participates in acrosome-acroplaxome complex, head-tail coupling apparatus, and spermatid tail biogenesis; loss of Ift88 causes abnormal head shaping and tail-less spermatids, and disruption of microtubules blocks progression of IFT88-stained proacrosomal vesicles to the acrosome.\",\n      \"method\": \"Immunocytochemistry, mouse mutant analysis (Ift88 mutant), Brefeldin-A and nocodazole treatment\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional consequence in mutant, single lab\",\n      \"pmids\": [\"21337470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"IFT88 plays a cilia- and PCP-independent role in controlling oriented cell divisions during zebrafish gastrulation and neurulation; maternal+zygotic IFT88 mutant embryos lacking all cilia show oriented cell division defects without PCP phenotypes.\",\n      \"method\": \"Maternal+zygotic zebrafish mutant analysis, live imaging, cell division orientation measurements\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — rigorous genetic epistasis using MZ mutants with defined cellular phenotype\",\n      \"pmids\": [\"24095732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IFT88 is required for cell migration independently of cilia; loss of Ift88 impairs polarization of migrating MDCK cells and reduces microtubule content at the leading edge, without affecting MT dynamics or nucleation.\",\n      \"method\": \"siRNA/shRNA knockdown, live cell imaging, fluorescence microscopy of migrating cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined cellular phenotype, single lab, cilia-independence established\",\n      \"pmids\": [\"26465598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IFT88 regulates actin organization and cortical stiffness in chondrocytes; hypomorphic IFT88(orpk) cells show increased acto-myosin stress fibers, reduced cortical tension, slower actin cortex reformation after blebbing, and altered cell mechanical properties.\",\n      \"method\": \"Confocal microscopy, micropipette aspiration, live cell actin imaging with LifeACT-GFP\",\n      \"journal\": \"Osteoarthritis and cartilage\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional and mechanical measurements, single lab\",\n      \"pmids\": [\"26493329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DGKδ (a diacylglycerol kinase resident in the ER) triggers release of IFT88-containing vesicles from ER exit sites (ERES) via interaction with IFT88; IFT88 associates with COPII-coated vesicles at ERES, and DGKδ is required for Shh signaling in vitro and in vivo.\",\n      \"method\": \"Co-IP, RNAi silencing, gene knockout, vesicle trafficking assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP interaction plus functional rescue, single lab\",\n      \"pmids\": [\"28706295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IFT70 interacts with the IFT52-IFT88 dimer via its first TPR domain and terminal helix; deletion of either disrupts IFT70-IFT52-IFT88 interaction and abolishes ciliogenesis in IFT70-KO cells.\",\n      \"method\": \"Knockout cell lines, co-immunoprecipitation, deletion mutagenesis, ciliogenesis rescue assay\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of interaction domain combined with KO rescue and Co-IP\",\n      \"pmids\": [\"29654116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TCTN2 depletion causes IFT88 to leak into the basal body lumen rather than entering the cilium, demonstrating that the transition zone gates IFT88 access to the ciliary compartment.\",\n      \"method\": \"CRISPR/Cas9 knockout, super-resolution microscopy, quantitative localization analysis\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — super-resolution imaging with quantitative spatial analysis, single lab\",\n      \"pmids\": [\"29866362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IFT88 regulates LRP-1-mediated endocytosis of extracellular proteases in chondrocytes; hypomorphic IFT88 mutation disrupts LRP-1 concentration at the ciliary base, increases receptor shedding, and reduces protease clearance, elevating aggrecanase activity independently of Hedgehog signaling.\",\n      \"method\": \"Hypomorphic mutant chondrocyte line, immunofluorescence, protease activity assays, receptor shedding assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO/mutation with defined mechanistic pathway, single lab\",\n      \"pmids\": [\"29920219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"IFT88 concentrates at kinetochore fiber (k-fiber) minus-ends, interacts with NuMA, and is required for NuMA enrichment at newly generated k-fiber minus-ends after laser ablation; IFT88 depletion impairs k-fiber re-anchoring into spindles and chromosome alignment.\",\n      \"method\": \"MT laser ablation, siRNA depletion, Co-IP, nocodazole washout, immunofluorescence\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP interaction, laser ablation functional assay, multiple mechanistic readouts\",\n      \"pmids\": [\"31312011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WDR62 recruits CPAP to the basal body, which is required for subsequent recruitment of IFT88; WDR62 missense mutations (V66M, R439H) localize to the basal body but fail to recruit CPAP, resulting in IFT88 deficiency, ciliogenesis failure, and premature radial glia differentiation leading to microcephaly.\",\n      \"method\": \"CRISPR/Cas9 mouse models, immunofluorescence co-localization, loss-of-function analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (WDR62→CPAP→IFT88) with defined developmental phenotype, single lab\",\n      \"pmids\": [\"31816041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Loss of IFT88 in endothelial cells promotes endothelial-to-mesenchymal transition (EndMT), increases Sonic Hedgehog signaling effectors, and in vivo endothelial-specific Ift88 KO exacerbates bleomycin-induced pulmonary fibrosis.\",\n      \"method\": \"siRNA knockdown in ECs, endothelial-specific Ift88 KO mice, marker expression analysis, bleomycin fibrosis model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined fibrosis phenotype, mechanistic marker analysis, single lab\",\n      \"pmids\": [\"32161282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MEIG1 is required for manchette localization of IFT88 and IFT20 in elongating spermatids; Co-IP from mouse testis confirms MEIG1-IFT88-IFT20 complex, and in Meig1 KO mice IFT88 is absent from the manchette and drifts to lighter sucrose gradient fractions, indicating MEIG1 stabilizes IFT88 in this compartment.\",\n      \"method\": \"Co-immunoprecipitation, Meig1 KO mouse, sucrose gradient sedimentation, immunofluorescence\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP combined with KO mouse and sedimentation assay, multiple orthogonal methods\",\n      \"pmids\": [\"35257720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"XIAP functions as an E3 ubiquitin ligase for IFT88; TGF-β enhances XIAP-mediated ubiquitination of IFT88, promoting its proteasomal degradation, cilia loss, and HSC activation leading to liver fibrosis. Blocking XIAP-mediated IFT88 degradation prevents TGF-β-induced HSC activation.\",\n      \"method\": \"Co-IP, ubiquitination assay, Ift88 KO mice, liver fibrosis model, proteasome inhibition\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — writer (XIAP) identified via Co-IP and ubiquitination assay, in vivo KO validation, multiple orthogonal methods\",\n      \"pmids\": [\"38351372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"UFL1-mediated UFMylation of IFT88 at lysine 572 antagonizes ubiquitination by PJA2 E3 ligase, preventing IFT88 proteasomal degradation; the K572R IFT88 mutant shows increased ubiquitination and reduced stability, and UFL1 KO mice have severe ciliary defects.\",\n      \"method\": \"Co-IP, site-directed mutagenesis, UFL1 KO mouse, proteasome inhibition, UFMylation assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — site-specific mutagenesis of modification site, identification of writer (UFL1) and eraser (PJA2), in vivo validation\",\n      \"pmids\": [\"41272290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IFT88 inhibits TRPV4-mediated calcium influx in endplate chondrocytes under excessive mechanical stress; co-immunoprecipitation shows IFT88-TRPV4 interaction, and IFT88 negatively regulates its own transcription factor C/EBPα under abnormal stress. IFT88 overexpression in vivo maintains disc height and reduces endplate ossification.\",\n      \"method\": \"Co-immunoprecipitation, dual-luciferase assay, molecular docking, siRNA knockdown, in vivo AAV overexpression, flow cytometry\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP interaction with TRPV4, functional in vivo rescue, single lab\",\n      \"pmids\": [\"40441296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Deletion of Ift88 from chondrocytes disrupts Hedgehog (Ihh) signaling and downregulates the Wnt antagonist Sfrp5 (a downstream Hh target), leading to increased Wnt/β-catenin signaling specifically in columnar growth plate cells.\",\n      \"method\": \"Conditional Ift88 knockout mice, gene expression profiling, pathway analysis, immunohistochemistry for nuclear β-catenin\",\n      \"journal\": \"Journal of orthopaedic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis via conditional KO with pathway-level mechanistic readout, single lab\",\n      \"pmids\": [\"23034798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Loss of Tg737 in liver stem cells results in nuclear β-catenin accumulation and activation of the Wnt/β-catenin pathway, promoting EMT via a Snail-HNF4α negative feedback circuit; XAV939 (β-catenin inhibitor) rescues the malignant transformation phenotype.\",\n      \"method\": \"shRNA knockdown, pathway inhibitor rescue, β-catenin nuclear localization, Western blot\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with pharmacological rescue establishing pathway position, single lab\",\n      \"pmids\": [\"28536011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Ift88 is required in cranial neural crest cells for craniofacial/mandibular development partially through Sonic Hedgehog signaling; loss of Ift88 in mandibular mesenchyme downregulates Hh signaling, but Ift88 also affects chondrogenesis independently as Smo deletion shows distinct phenotype.\",\n      \"method\": \"Conditional Ift88 KO (Wnt1Cre), Smo conditional KO comparison, histology, in situ hybridization\",\n      \"journal\": \"Journal of anatomy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis via parallel conditional KOs, single lab\",\n      \"pmids\": [\"31657471\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"IFT88 loss in cranial neural crest-derived palatal mesenchyme abolishes primary cilia and downregulates Shh signaling, leading to bilateral cleft lip and palate; palatal mesenchyme-specific Ift88 deletion recapitulates isolated cleft palate.\",\n      \"method\": \"Wnt1-Cre and Osr2KI-Cre conditional Ift88 KO mice, cilia immunostaining, Shh pathway analysis, proliferation assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two independent Cre drivers establishing cell-autonomous requirement, defined pathway placement\",\n      \"pmids\": [\"28069795\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IFT88 is a core subunit of the IFT-B complex that directly interacts with IFT52 and IFT46 to form a ternary scaffold; it is transported bidirectionally along ciliary microtubules and is essential for ciliogenesis in virtually all ciliated cell types, where it mediates anterograde cargo delivery (including photoreceptor outer segment proteins and Hedgehog pathway components); outside the cilium, IFT88 associates with the centrosome via its TPR motifs, participates in dynein1-driven transport of microtubule-nucleating factors to spindle poles to orient cell division, concentrates at kinetochore fiber minus-ends to recruit NuMA, regulates cell migration by maintaining leading-edge microtubules, controls G1-S transition by interacting with the Rb-regulator Che-1, and is subject to post-translational regulation by XIAP-mediated ubiquitination (promoted by TGF-β) and UFL1-mediated UFMylation (which protects IFT88 from proteasomal degradation), collectively linking ciliary homeostasis to cell proliferation, fibrosis, and developmental signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"IFT88 is a TPR-repeat-containing core subunit of the IFT-B complex that is essential for ciliogenesis across metazoans and functions in multiple cilia-independent processes including mitotic spindle orientation, cell-cycle control, and cell migration. Within the IFT-B complex, IFT88 forms a ternary scaffold with IFT52 and IFT46, undergoes bidirectional intraflagellar transport along the axoneme, and its entry into the ciliary compartment is gated by the transition zone component TCTN2 [PMID:20435895, PMID:11290289, PMID:29866362]. Outside the cilium, IFT88 localizes to the centrosome via its TPR motifs, participates in dynein1-driven transport of microtubule-nucleating factors to spindle poles, concentrates at kinetochore-fiber minus-ends to recruit NuMA for proper chromosome alignment, interacts with the Rb-regulator Che-1 to restrain G1–S progression, and maintains leading-edge microtubules during cell migration [PMID:17264151, PMID:21441926, PMID:31312011, PMID:26465598]. IFT88 protein stability is regulated by competing post-translational modifications: XIAP-mediated ubiquitination (enhanced by TGF-β) targets IFT88 for proteasomal degradation promoting cilia loss and fibrosis, whereas UFL1-mediated UFMylation at Lys572 antagonizes ubiquitination by PJA2 and stabilizes IFT88 [PMID:38351372, PMID:41272290].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing IFT88 as essential for ciliogenesis resolved the question of which IFT particle subunits are individually required for cilium assembly, showing that loss of a single IFT-B component abolishes flagella/cilia across species.\",\n      \"evidence\": \"Insertional mutagenesis in Chlamydomonas and Tg737 mutant mice with EM and light microscopy\",\n      \"pmids\": [\"11062270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which IFT88 contributes to IFT particle integrity not defined\", \"Mammalian null (not hypomorphic) phenotype not yet characterized\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Direct visualization of IFT88 (OSM-5) undergoing bidirectional transport in living cilia demonstrated that IFT88 is a bona fide cargo of the IFT machinery, not merely a structural requirement.\",\n      \"evidence\": \"OSM-5::GFP time-lapse imaging in C. elegans sensory neurons with transgenic rescue\",\n      \"pmids\": [\"11290289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Speed and processivity of IFT88-containing trains not quantified\", \"Post-translational regulation of IFT88 transport not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating that IFT88 is required for photoreceptor outer segment assembly extended the ciliary requirement to a specialized sensory structure and linked IFT88 to retinal degeneration.\",\n      \"evidence\": \"Tg737 mutant mice, immunolocalization to connecting cilium, histological analysis of retinal degeneration\",\n      \"pmids\": [\"11916979\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific outer segment cargoes transported by IFT88 not identified\", \"Whether phenotype is developmental versus maintenance not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery of IFT88's centrosomal localization and interaction with the Rb-regulator Che-1 revealed a cilia-independent role in G1–S cell-cycle control, fundamentally expanding IFT88 function beyond ciliogenesis.\",\n      \"evidence\": \"Cell fractionation, Co-IP of IFT88–Che-1, RNAi and overexpression cell-cycle assays in human cells\",\n      \"pmids\": [\"17264151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphorylation or modification linking IFT88 to Rb pathway not characterized\", \"Whether Che-1 interaction is TPR-dependent not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Reconstitution of the IFT88–IFT52–IFT46 ternary complex defined the minimal interaction network within the IFT-B core, answering which subunits directly contact IFT88.\",\n      \"evidence\": \"Yeast two-hybrid, bacterial coexpression pulldown, and chemical cross-linking\",\n      \"pmids\": [\"20435895\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the ternary complex not determined at atomic resolution\", \"How the ternary core integrates into the full IFT-B complex not shown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of IFT88 in a dynein1-driven complex that delivers microtubule-nucleating factors to spindle poles established a direct mitotic mechanism explaining spindle orientation defects upon IFT88 loss.\",\n      \"evidence\": \"siRNA in human cells, mouse mutant kidney cells, zebrafish embryos; live imaging and Co-IP\",\n      \"pmids\": [\"21441926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of all cargo proteins in the IFT88–dynein1 spindle complex not exhaustive\", \"Whether IFT88's ciliary and mitotic pools are independently regulated is unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Conditional deletion in chondrocytes revealed that IFT88-dependent cilia transduce Ihh signaling to restrain Wnt/β-catenin activity, placing IFT88 at a signaling crossroads between Hedgehog and Wnt pathways in skeletal development.\",\n      \"evidence\": \"Conditional Ift88 KO mice, gene expression profiling, nuclear β-catenin immunohistochemistry\",\n      \"pmids\": [\"23034798\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether IFT88 directly modulates Wnt pathway components or only indirectly via Hh is unclear\", \"Single tissue context studied\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Maternal-zygotic IFT88 mutant zebrafish lacking all cilia still displayed oriented cell division defects without PCP phenotypes, formally separating IFT88's mitotic role from both cilia and planar cell polarity.\",\n      \"evidence\": \"MZ mutant zebrafish, live imaging, division orientation quantification during gastrulation\",\n      \"pmids\": [\"24095732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular partners mediating the cilia-independent spindle orientation function in vivo not identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"IFT88 was shown to maintain leading-edge microtubule content during cell migration and to regulate actin cortex organization and cortical stiffness, extending its cytoskeletal roles beyond the mitotic spindle.\",\n      \"evidence\": \"siRNA/shRNA knockdown in migrating MDCK cells; LifeACT-GFP and micropipette aspiration in hypomorphic chondrocytes\",\n      \"pmids\": [\"26465598\", \"26493329\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which IFT88 stabilizes leading-edge microtubules unresolved\", \"Whether actin phenotype is direct or secondary to microtubule defects unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"IFT88 loss in cranial neural crest cells was shown to abolish cilia and Shh signaling, causing cleft lip/palate and mandibular defects, demonstrating tissue-specific developmental consequences of IFT88-dependent Hedgehog transduction.\",\n      \"evidence\": \"Wnt1-Cre and Osr2KI-Cre conditional Ift88 KO mice, Shh pathway analysis, comparison with Smo KO\",\n      \"pmids\": [\"28069795\", \"31657471\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IFT88 has Hedgehog-independent roles in palatal mesenchyme not fully dissected\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mapping IFT70's interaction to the IFT52–IFT88 dimer and showing that TCTN2 gates IFT88 ciliary entry refined the architecture and spatial regulation of IFT-B at the transition zone.\",\n      \"evidence\": \"IFT70-KO rescue with deletion mutants, Co-IP; TCTN2 KO super-resolution imaging\",\n      \"pmids\": [\"29654116\", \"29866362\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of the IFT70–IFT52–IFT88 sub-complex not yet available\", \"How the transition zone physically gates IFT88 is mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"IFT88's localization at kinetochore-fiber minus-ends and its interaction with NuMA revealed a mechanism for k-fiber re-anchoring during mitosis, explaining chromosome alignment defects upon IFT88 depletion.\",\n      \"evidence\": \"Laser ablation of k-fibers, siRNA, Co-IP of IFT88–NuMA, immunofluorescence\",\n      \"pmids\": [\"31312011\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IFT88 is transported along k-fibers or associates statically is unknown\", \"Structural basis of IFT88–NuMA interaction not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"MEIG1 was identified as a spermatid-specific adaptor that recruits IFT88 to the manchette, establishing a tissue-specific IFT88 localization mechanism required for spermiogenesis.\",\n      \"evidence\": \"Co-IP from mouse testis, Meig1 KO, sucrose gradient sedimentation, immunofluorescence\",\n      \"pmids\": [\"35257720\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MEIG1 directly binds IFT88 or acts via IFT20 not resolved\", \"Cargo transported by manchette-associated IFT88 not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of XIAP as an E3 ubiquitin ligase for IFT88, enhanced by TGF-β, established a post-translational degradation axis linking ciliary loss to hepatic stellate cell activation and liver fibrosis.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, Ift88 KO mice, liver fibrosis model, proteasome inhibition\",\n      \"pmids\": [\"38351372\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific lysine residues ubiquitinated by XIAP not mapped\", \"Whether XIAP-mediated degradation operates in other fibrotic tissues is untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery that UFL1-mediated UFMylation at K572 competes with PJA2-mediated ubiquitination to stabilize IFT88 revealed a dual post-translational switch controlling IFT88 protein levels and ciliary homeostasis.\",\n      \"evidence\": \"Site-directed K572R mutagenesis, UFL1 KO mice, UFMylation and ubiquitination assays\",\n      \"pmids\": [\"41272290\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether UFMylation regulates IFT88 in specific tissues/cell types is unexplored\", \"Upstream signals triggering UFMylation versus ubiquitination not characterized\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structural model of full-length IFT88 within the intact IFT-B train, the signaling inputs that toggle between UFMylation and ubiquitination, and the mechanism by which IFT88 is partitioned between ciliary and non-ciliary pools remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No atomic structure of IFT88 in the context of the full IFT train\", \"Signals controlling UFMylation/ubiquitination balance unknown\", \"Partitioning mechanism between ciliary and centrosomal/mitotic pools undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 4, 11]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [5, 8, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 2, 12]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [3, 5, 15]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [5, 14]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 2, 11, 12]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 5, 7, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [21, 22, 24]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [15, 23, 24]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [18, 19]}\n    ],\n    \"complexes\": [\n      \"IFT-B complex\",\n      \"IFT88-IFT52-IFT46 ternary complex\"\n    ],\n    \"partners\": [\n      \"IFT52\",\n      \"IFT46\",\n      \"IFT70\",\n      \"NuMA\",\n      \"Che-1\",\n      \"XIAP\",\n      \"UFL1\",\n      \"MEIG1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}