{"gene":"IFT88","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2000,"finding":"IFT88 (Chlamydomonas) / Tg737 (mouse) is required for assembly of cilia and flagella; Chlamydomonas insertional mutants lacking IFT88 have no flagella, and Tg737 mutant mice have shorter primary cilia in the kidney, demonstrating IFT88 is an essential IFT particle subunit for ciliary assembly in both unicellular and mammalian contexts.","method":"Insertional mutagenesis in Chlamydomonas; mouse mutant analysis with electron microscopy; cDNA cloning and sequence comparison","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and structural analysis across two organisms, replicated by multiple labs subsequently","pmids":["11062270"],"is_preprint":false},{"year":2001,"finding":"C. elegans OSM-5 (IFT88 ortholog) localizes to the cilium base and axoneme and undergoes intraflagellar transport particle movement within cilia, as shown by OSM-5::GFP time-lapse imaging; osm-5 mutants have ciliary defects consistent with a ciliogenic role.","method":"Transgenic GFP fusion rescue of osm-5 mutants; time-lapse live imaging; immunofluorescence; DAF-19 transcription factor regulation confirmed by expression analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — live imaging of IFT particle movement with functional rescue, independently consistent with Chlamydomonas data","pmids":["11290289"],"is_preprint":false},{"year":2002,"finding":"IFT88/Tg737 protein localizes to photoreceptor connecting cilia, and loss-of-function mutation in Tg737/IFT88 causes abnormal outer segment development and retinal degeneration, demonstrating that IFT is required for photoreceptor outer segment assembly and maintenance.","method":"Immunolocalization of IFT particle proteins in photoreceptors; analysis of Tg737 mutant mouse retinal phenotype by electron microscopy and histology","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiment combined with KO phenotypic analysis in two orthogonal readouts","pmids":["11916979"],"is_preprint":false},{"year":1996,"finding":"Transgenic re-expression of wild-type Tg737 cDNA in Tg737 mutant mice restores normal renal function and normal basolateral EGFr localization in collecting duct epithelium, directly confirming Tg737 as the causative gene for collecting duct cyst formation.","method":"Transgenic rescue experiment; renal function tests; immunohistochemistry for EGFr localization","journal":"Kidney international","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct transgenic rescue with functional readout, definitive causal assignment","pmids":["8887283"],"is_preprint":false},{"year":2007,"finding":"IFT88/polaris localizes to the centrosome throughout the cell cycle in a microtubule- and dynein-independent manner, mediated by its TPR motifs. Overexpression prevents G1-S transition and induces apoptosis; RNAi depletion promotes cell-cycle progression to S, G2, and M phases. IFT88 interacts with Che-1, an Rb-binding protein that inhibits Rb growth-suppressing function.","method":"Immunofluorescence/fractionation for centrosomal localization; RNAi knockdown and overexpression with cell-cycle FACS analysis; Co-IP for IFT88–Che-1 interaction; TPR domain deletion mutagenesis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, mutagenesis, RNAi, OE) in single lab","pmids":["17264151"],"is_preprint":false},{"year":2011,"finding":"In mitosis, IFT88 localizes to spindle poles and is part of a dynein1-driven complex that transports peripheral microtubule clusters containing microtubule-nucleating proteins to spindle poles to ensure proper astral microtubule array formation and spindle orientation. IFT88 depletion causes mitotic defects in human cells, Tg737(orpk) kidney cells, and zebrafish embryos.","method":"RNAi depletion in human cells; analysis of Tg737(orpk) mouse mutant kidney cells; zebrafish embryo knockdown; live-cell imaging of spindle dynamics; Co-IP for dynein1 complex","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple model systems, Co-IP for complex membership, live-cell imaging with functional spindle readout","pmids":["21441926"],"is_preprint":false},{"year":2010,"finding":"IFT88 directly interacts with IFT52 and IFT46 within IFT complex B, and these three proteins can form a ternary complex. The IFT52–IFT88 interaction was confirmed by chemical cross-linking.","method":"Yeast two-hybrid; bacterial coexpression pulldown; chemical cross-linking; in vivo electroporation rescue of ift46 mutant","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of binary and ternary complexes confirmed by two orthogonal biochemical methods","pmids":["20435895"],"is_preprint":false},{"year":2018,"finding":"IFT70 interacts with the IFT52–IFT88 dimer within IFT-B; deletion of the first TPR repeat or the terminal α36 helix of IFT70 abolishes its interaction with the IFT52–IFT88 dimer and abrogates ciliogenesis rescue in IFT70 knockout cells.","method":"IFT70A/B double knockout cells; exogenous expression rescue; deletion mutagenesis of IFT70; Co-IP/pulldown to map IFT70–IFT52–IFT88 interaction","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with functional rescue and biochemical interaction mapping in KO cells","pmids":["29654116"],"is_preprint":false},{"year":2013,"finding":"In maternal+zygotic ift88 mutant zebrafish embryos (which never form cilia), planar cell polarity (PCP) is established normally, demonstrating cilia are not required for PCP. However, IFT88 plays a cilia-independent role in controlling oriented cell divisions during gastrulation and neurulation.","method":"Generation of maternal+zygotic IFT88 zebrafish mutants; PCP marker analysis; division orientation measurements","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis using complete maternal+zygotic loss, two orthogonal phenotypic readouts","pmids":["24095732"],"is_preprint":false},{"year":2015,"finding":"Loss of Ift88 impairs cell migration independently of cilia; Ift88-depleted MDCK cells show defective leading-edge polarization and fewer microtubules at the leading edge, without affecting MT dynamics or nucleation.","method":"siRNA knockdown in MDCK cells; wound-healing/migration assays; confocal microscopy of MT organization; cilia-deficient controls","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean KD with defined cellular phenotype, single lab, single primary method for MT analysis","pmids":["26465598"],"is_preprint":false},{"year":2017,"finding":"DGKδ (an ER-resident lipid kinase) interacts with IFT88 and triggers release of IFT88-containing COPII-coated vesicles from ER exit sites (ERES), facilitating delivery of ciliary cargo toward the primary cilium. RNAi of DGKδ impairs IFT88 vesicle release and Hedgehog signaling.","method":"Co-IP of IFT88 with DGKδ; association with COPII vesicles by co-localization; RNAi and knockout strategies; Shh signaling reporter assays in vitro and in vivo","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional rescue, two methods, single lab","pmids":["28706295"],"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 to facilitate k-fiber re-anchoring into the spindle and proper chromosome alignment.","method":"MT laser ablation followed by IFT88 localization; Co-IP of IFT88 with NuMA; nocodazole washout with IFT88 depletion; chromosome alignment assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus laser ablation functional assay, single lab with two orthogonal approaches","pmids":["31312011"],"is_preprint":false},{"year":2011,"finding":"IFT88 localizes to the trans-Golgi network of spermatids and is present in proacrosomal vesicles, along acrosome membranes, and the head-tail coupling apparatus. Loss of IFT88 causes abnormal spermatid head shaping, tail absence, and blockade of GMAP210-stained vesicle and mitochondrial progression through the manchette.","method":"Immunocytochemistry in wild-type and Ift88 mutant spermatids; Brefeldin-A and nocodazole disruption of Golgi/microtubules","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with functional KO phenotype, two orthogonal approaches (IHC + pharmacological disruption)","pmids":["21337470"],"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, IFT20, and IFT88 form a complex; in Meig1 KO mice, IFT88 and IFT20 are absent from the manchette and drift to lighter sucrose gradient fractions, while MEIG1 localization is unchanged in conditional Ift20 KO mice, placing MEIG1 upstream of IFT88 manchette targeting.","method":"Co-IP from mouse testis; Meig1 KO mouse analysis by immunofluorescence; sucrose gradient sedimentation; conditional Ift20 KO","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus KO localization analysis in two genetic backgrounds, single lab","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. Blocking XIAP-mediated IFT88 degradation ablates TGF-β-induced HSC activation and liver fibrosis. Ift88-KO mice are more susceptible to carbon tetrachloride-induced liver fibrosis.","method":"Mechanistic studies identifying XIAP as E3 ligase; ubiquitination assays; Ift88 KO mouse + CCl4 fibrosis model; rescue experiments blocking XIAP","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay plus in vivo KO with functional fibrosis readout, single lab","pmids":["38351372"],"is_preprint":false},{"year":2025,"finding":"UFL1 UFMylates IFT88 at lysine 572; this UFMylation antagonizes ubiquitination of IFT88 by PJA2 E3 ligase, preventing proteasomal degradation. A K572R mutant of IFT88 shows increased ubiquitination and reduced stability; UFL1 genetic ablation in mice causes severe ciliary defects in multiple tissues.","method":"UFMylation site mapping (K572); site-directed mutagenesis (K572R); ubiquitination assays; UFL1 KO mouse phenotyping; identification of PJA2 as the competing E3 ligase","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1 / Moderate — PTM site mapping with mutagenesis, competing ligase identification, and in vivo KO phenotype in a single rigorous study","pmids":["41272290"],"is_preprint":false},{"year":2018,"finding":"Disruption of IFT88 (hypomorphic mutation) redistributes LRP-1 receptor away from the ciliary base hot spot, increases LRP-1 shedding, and reduces the rate of extracellular protease (aggrecanase) clearance from chondrocytes, demonstrating an IFT88-dependent, Hedgehog-independent role in LRP-1-mediated endocytosis.","method":"IFT88(orpk) hypomorphic chondrocyte cell line; aggrecanase activity assay; confocal imaging of LRP-1 distribution; protease clearance assay","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional assay with hypomorphic mutant cells, single lab, multiple readouts","pmids":["29920219"],"is_preprint":false},{"year":2018,"finding":"TCTN2 depletion causes leakage of IFT88 from the ciliary axoneme toward the basal body lumen; super-resolution microscopy shows IFT88 lumen occupancy also occurs in RPGRIP1L-depleted and cytochalasin D-treated cells, indicating the transition zone gates IFT88 compartmentalization.","method":"CRISPR/Cas9 TCTN2 KO; super-resolution (STORM/SIM) and widefield microscopy; quantitative localization analysis; siRPGRIP1L and cytochalasin D perturbations","journal":"Biophysical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — super-resolution imaging with multiple genetic/pharmacological perturbations, single lab","pmids":["29866362"],"is_preprint":false},{"year":2012,"finding":"Deletion of Ift88 in chondrocytes disrupts Hedgehog (Ihh) signaling, downregulates Sfrp5 (an extracellular Wnt antagonist that is a downstream Hh target), and leads to increased nuclear β-catenin and Wnt/β-catenin signaling specifically in growth plate columnar cells.","method":"Conditional Ift88 KO in chondrocytes; gene expression profiling; pathway analysis; in situ hybridization for Axin2, Lef1; immunohistochemistry for nuclear β-catenin; Shh treatment of rib chondrocytes","journal":"Journal of orthopaedic research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with pathway analysis and functional follow-up, single lab","pmids":["23034798"],"is_preprint":false},{"year":2017,"finding":"Loss of Ift88 in cranial neural crest cells (Wnt1-Cre;Ift88fl/fl mice) eliminates primary cilia from palatal mesenchyme, decreases neural crest cell proliferation, and downregulates Shh signaling in the palatal mesenchyme, leading to bilateral cleft lip and palate. Palatal mesenchyme-specific loss (Osr2KI-Cre;Ift88fl/fl) produces isolated cleft palate.","method":"Conditional KO mice (Wnt1-Cre and Osr2KI-Cre); immunofluorescence for cilia; Shh pathway analysis; cell proliferation assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two tissue-specific conditional KO lines with pathway and cellular phenotypic readouts, single lab","pmids":["28069795"],"is_preprint":false},{"year":2021,"finding":"IFT88 deficiency in proximal tubular cells suppresses cisplatin-induced autophagy; autophagy activator Tat-beclin 1 partially rescues IFT88-associated cell death; re-expression of IFT88 partially restores autophagy in knockdown cells. Proximal tubule-specific IFT88 KO mice exhibit more severe AKI than wild-type upon cisplatin treatment.","method":"Proximal tubule-specific IFT88 KO mice; siRNA knockdown in HK-2 cells; autophagy flux assays; pharmacological autophagy activator rescue; IFT88 re-expression","journal":"American journal of physiology. Renal physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO plus cell rescue experiments with multiple autophagy readouts, single lab","pmids":["34251272"],"is_preprint":false},{"year":2021,"finding":"IFT88 knockdown in fibroblasts causes significant upregulation of ECM genes (Fn1, Col1a1, Ctgf), reduces conduction velocity in cardiomyocyte monolayers, and increases conduction block, demonstrating that ciliary IFT88 in fibroblasts regulates ECM deposition and thereby cardiac electrophysiology.","method":"siRNA knockdown of Ift88 in neonatal rat fibroblasts; CM-FB co-culture; electrical mapping; gene expression analysis","journal":"Frontiers in physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean KD with defined cellular phenotype, single lab, co-culture model","pmids":["36467697"],"is_preprint":false},{"year":2020,"finding":"WDR62 mutant proteins (V66M, R439H) localize to the basal body but fail to recruit CPAP; as a consequence, IFT88 recruitment is deficient, leading to impaired ciliogenesis and premature radial glia differentiation, placing CPAP upstream of IFT88 in the ciliogenesis pathway.","method":"CRISPR/Cas9 WDR62 mutant mice; immunofluorescence for CPAP and IFT88 at basal body; ciliogenesis and radial glia differentiation assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via CRISPR mutant mice, direct localization imaging, multiple orthogonal readouts, single lab","pmids":["31816041"],"is_preprint":false},{"year":2021,"finding":"Ift88, but not Kif3a (Kinesin-2 subunit), is required for establishment of the periciliary membrane compartment (PCMC) in MDCK cells and in C. elegans (osm-5 mutants lack PCMC while osm-3/kinesin-2 mutants form PCMC normally), revealing an IFT-B1-independent, cilium-independent function of IFT88 in PCMC organization.","method":"Ift88 KD in MDCK cells; C. elegans osm-5 and osm-3 mutant analysis; Kif3a KD comparison; fluorescent exclusion assay for PCMC; split IFT-B1 mutants","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — comparative genetic analysis in two model systems (mammalian + C. elegans), single lab","pmids":["34753064"],"is_preprint":false},{"year":1995,"finding":"The human hTg737 gene encodes a protein containing tetratricopeptide repeat (TPR) motifs, is 95% identical to the mouse Tg737 protein, and maps to chromosome 13q12.1. It is broadly expressed including in kidney and liver.","method":"cDNA cloning and sequencing; chromosome mapping (FISH/hybrid panels); Northern blot expression analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — structural characterization and mapping, replicated by independent sequence analysis paper","pmids":["7633404"],"is_preprint":false},{"year":2025,"finding":"Loss of primary cilia specifically in brown adipose tissue (BAT; Ucp1-Cre;Ift88 fl/fl) causes neonatal lethality from thermogenesis failure despite preserved UCP1 expression; the mechanism involves IFT88-dependent suppression of HMGCS2 downregulation and ROS production, impairing ketogenesis required for non-shivering thermogenesis. Neonatal lethality is rescued by thermoneutral housing or β-hydroxybutyrate supplementation.","method":"BAT-specific Ift88 conditional KO mice; metabolic assays (ketone body levels, ROS); qPCR for Hmgcs2; rescue by thermoneutral housing and β-HB supplementation","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with molecular mechanism (HMGCS2/ketogenesis) and pharmacological rescue, single lab, preprint","pmids":["bio_10.1101_2025.11.12.687971"],"is_preprint":true},{"year":2025,"finding":"IFT88 is required for formation of tubular membrane intermediates (C-shaped and toroidal) during early ciliogenesis at the mother centriole; absence of IFT88 blocks progression through these membrane trafficking steps upstream of axoneme growth.","method":"3D volume EM (isotropic ultrastructure imaging) of IFT88-depleted cells; quantitative analysis of ciliogenesis membrane intermediates","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single structural imaging approach in preprint, no biochemical or mutagenesis follow-up reported for IFT88 specifically","pmids":["bio_10.1101_2025.08.20.670930"],"is_preprint":true},{"year":2025,"finding":"IFT88 inhibits TRPV4-mediated calcium influx in endplate chondrocytes; mechanistic studies show IFT88 negatively regulates its own transcription factor C/EBPα under abnormal stress and reduces TRPV4 hyperactivation, thereby lowering intracellular calcium, oxidative stress, and Wnt pathway activation. In vivo IFT88 overexpression maintains disc height and reduces endplate ossification.","method":"Molecular docking; co-immunoprecipitation; dual-luciferase assays; flow cytometry (calcium/ROS); rat tail crush model; IFT88 overexpression in vivo","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical methods plus in vivo functional rescue, single lab","pmids":["40441296"],"is_preprint":false}],"current_model":"IFT88 is a TPR-repeat-containing subunit of IFT complex B that directly binds IFT52 and IFT46 to form the core IFT-B scaffold; it is transported bidirectionally along ciliary/flagellar microtubules and is essential for assembly and maintenance of primary cilia and flagella across eukaryotes. Beyond its canonical ciliary role, IFT88 is stabilized by UFL1-mediated UFMylation at K572 (which antagonizes PJA2-driven ubiquitination and proteasomal degradation) and is targeted for degradation by XIAP in response to TGF-β. In non-ciliated and dividing cells, IFT88 associates with centrosomes via its TPR motifs, interacts with the Rb-binding protein Che-1 to regulate G1-S transition, participates in a dynein1-driven complex that delivers microtubule-nucleating factors to spindle poles for astral microtubule formation and spindle orientation, and concentrates at k-fiber minus-ends where it recruits NuMA for k-fiber re-anchoring. IFT88 also has cilia-independent roles in cell migration (leading-edge MT organization) and oriented cell division during zebrafish gastrulation, and in spermatids it is recruited to the manchette by MEIG1 to support intramanchette transport for flagellum biogenesis."},"narrative":{"mechanistic_narrative":"IFT88 is an essential, evolutionarily conserved subunit of intraflagellar transport (IFT) complex B that drives assembly and maintenance of cilia and flagella across eukaryotes, from Chlamydomonas and C. elegans to mammalian kidney and photoreceptors [PMID:11062270, PMID:11290289, PMID:11916979]. Within IFT-B it is a TPR-motif protein that directly binds IFT52 and IFT46 to form a core ternary scaffold, which in turn docks IFT70 via the IFT52–IFT88 dimer—an interaction required for ciliogenesis [PMID:20435895, PMID:29654116]. IFT88 undergoes bidirectional IFT particle movement within the axoneme [PMID:11290289], and its ciliary compartmentalization is gated by the transition zone [PMID:29866362]. Cargo delivery toward the cilium depends on DGKδ-triggered release of IFT88-containing COPII vesicles from ER exit sites, supporting Hedgehog signaling [PMID:28706295], and IFT88 recruitment to the basal body lies downstream of CPAP/WDR62 [PMID:31816041]. Through ciliary Hedgehog signaling, IFT88 governs developmental programs including chondrocyte growth-plate signaling and Wnt/β-catenin balance [PMID:23034798] and cranial neural crest proliferation during palatogenesis, where its loss causes cleft lip and palate [PMID:28069795]. Transgenic re-expression of Tg737/IFT88 rescues collecting-duct cystic kidney disease in mutant mice, establishing it as the causative gene [PMID:8887283]. Beyond cilia, IFT88 has multiple non-ciliary roles: it localizes to centrosomes via its TPR motifs and interacts with the Rb-binding protein Che-1 to restrain the G1–S transition [PMID:17264151]; it participates in a dynein1-driven complex that delivers microtubule-nucleating factors to spindle poles for astral microtubule formation and spindle orientation [PMID:21441926]; it concentrates at k-fiber minus-ends to recruit NuMA for k-fiber re-anchoring [PMID:31312011]; and it organizes leading-edge microtubules for cell migration and oriented cell division during gastrulation independently of cilia [PMID:24095732, PMID:26465598]. In spermatids, MEIG1 recruits IFT88 (with IFT20) to the manchette to support intramanchette transport for flagellum biogenesis [PMID:21337470, PMID:35257720]. IFT88 abundance is controlled by competing post-translational modifications: UFL1-mediated UFMylation at K572 antagonizes PJA2-driven ubiquitination and proteasomal degradation [PMID:41272290], while XIAP ubiquitinates IFT88 in response to TGF-β to promote its degradation during fibrogenesis [PMID:38351372].","teleology":[{"year":2000,"claim":"Established the foundational role of IFT88 as an essential IFT particle subunit required for ciliary and flagellar assembly, answering whether this protein is causally needed to build cilia.","evidence":"Insertional mutagenesis in Chlamydomonas and Tg737 mutant mouse analysis with EM","pmids":["11062270"],"confidence":"High","gaps":["Did not resolve where IFT88 sits within the IFT particle architecture","Mechanism of transport not directly visualized"]},{"year":2001,"claim":"Demonstrated that the IFT88 ortholog physically moves as part of IFT particles along the axoneme, linking the gene's loss-of-function phenotype to active transport behavior.","evidence":"GFP-fusion rescue and time-lapse live imaging in C. elegans osm-5 mutants","pmids":["11290289"],"confidence":"High","gaps":["Motor and cargo specificity not defined","Direct binding partners within IFT-B not identified"]},{"year":2002,"claim":"Extended IFT88's ciliary requirement to specialized sensory cilia by showing it is needed for photoreceptor outer segment assembly and maintenance.","evidence":"Immunolocalization in connecting cilia plus Tg737 mutant retinal phenotyping","pmids":["11916979"],"confidence":"High","gaps":["Specific cargoes transported in photoreceptors not identified"]},{"year":1996,"claim":"Provided definitive causal proof that Tg737/IFT88 is the gene responsible for cystic kidney disease by rescuing the phenotype with wild-type cDNA.","evidence":"Transgenic rescue with renal function and EGFr localization readouts","pmids":["8887283"],"confidence":"High","gaps":["Molecular mechanism linking ciliary defect to cystogenesis not established"]},{"year":2010,"claim":"Defined the molecular architecture by which IFT88 integrates into IFT-B, showing it directly binds IFT52 and IFT46 to form a core ternary scaffold.","evidence":"Yeast two-hybrid, bacterial co-expression pulldown, chemical cross-linking, and in vivo rescue","pmids":["20435895"],"confidence":"High","gaps":["Full IFT-B stoichiometry and structure not resolved","How the scaffold couples to motors unaddressed"]},{"year":2007,"claim":"Revealed an unexpected cilia-independent role at the centrosome and in cell-cycle control, showing IFT88 restrains G1–S transition via Che-1.","evidence":"Centrosomal fractionation, RNAi/overexpression with cell-cycle FACS, Co-IP, and TPR-deletion mutagenesis","pmids":["17264151"],"confidence":"High","gaps":["Mechanism by which Che-1 binding modulates Rb not detailed","Single-lab observation of cell-cycle phenotype"]},{"year":2011,"claim":"Identified a mitotic function in which IFT88 acts within a dynein1-driven complex delivering microtubule-nucleating factors to spindle poles for spindle orientation.","evidence":"RNAi across human cells, mouse Tg737(orpk) cells, and zebrafish embryos with live imaging and Co-IP","pmids":["21441926"],"confidence":"High","gaps":["Direct nucleating cargo identity not fully defined","How IFT88 selects mitotic vs ciliary roles unknown"]},{"year":2011,"claim":"Showed IFT88 functions in spermatid manchette-associated vesicle and organelle transport during flagellum biogenesis, broadening its trafficking role.","evidence":"Immunocytochemistry in wild-type/Ift88 mutant spermatids with BFA and nocodazole disruption","pmids":["21337470"],"confidence":"Medium","gaps":["Upstream targeting machinery to the manchette not yet identified at this stage","Direct cargo-binding mechanism not shown"]},{"year":2012,"claim":"Connected ciliary IFT88 to developmental signaling crosstalk, showing its loss disrupts Hedgehog and de-represses Wnt/β-catenin in growth-plate chondrocytes.","evidence":"Conditional Ift88 KO in chondrocytes with expression profiling, in situ hybridization, and Shh treatment","pmids":["23034798"],"confidence":"Medium","gaps":["Direct molecular step linking IFT88 to Sfrp5 not defined","Single-lab pathway analysis"]},{"year":2013,"claim":"Used complete maternal+zygotic loss to dissociate cilia from IFT88's role in oriented cell division, establishing a genuinely cilia-independent developmental function.","evidence":"Maternal+zygotic ift88 zebrafish mutants with PCP marker and division-orientation analysis","pmids":["24095732"],"confidence":"High","gaps":["Molecular effector for oriented division not identified","Relationship to spindle-pole role not connected"]},{"year":2015,"claim":"Defined a cilia-independent cytoskeletal role in cell migration, showing IFT88 organizes leading-edge microtubules without altering MT dynamics or nucleation.","evidence":"siRNA in MDCK cells with wound-healing assays and confocal MT imaging","pmids":["26465598"],"confidence":"Medium","gaps":["Direct MT-organizing partners not identified","Single primary method for MT analysis"]},{"year":2017,"claim":"Resolved a step in ciliary cargo delivery, showing DGKδ triggers release of IFT88-containing COPII vesicles from ER exit sites to feed Hedgehog signaling.","evidence":"Co-IP of IFT88 with DGKδ, COPII co-localization, and Shh reporter assays with RNAi","pmids":["28706295"],"confidence":"Medium","gaps":["Direct vs indirect IFT88–DGKδ interaction not fully resolved","Vesicle docking machinery downstream not defined"]},{"year":2017,"claim":"Demonstrated a tissue-level developmental requirement, showing neural-crest IFT88 loss eliminates cilia, lowers Shh, and causes cleft lip and palate.","evidence":"Tissue-specific conditional KO mice (Wnt1-Cre, Osr2KI-Cre) with cilia, Shh, and proliferation readouts","pmids":["28069795"],"confidence":"Medium","gaps":["Direct molecular target of Shh dysregulation not pinpointed","Single-lab study"]},{"year":2018,"claim":"Placed IFT88 downstream of the transition zone, showing transition-zone integrity gates IFT88 compartmentalization within the cilium.","evidence":"CRISPR TCTN2 KO with super-resolution imaging and RPGRIP1L/cytochalasin D perturbations","pmids":["29866362"],"confidence":"Medium","gaps":["Molecular determinant of IFT88 gating not identified","Functional consequence of lumen leakage not measured"]},{"year":2018,"claim":"Showed a Hedgehog-independent role in receptor-mediated endocytosis, where IFT88 maintains LRP-1 ciliary-base distribution and protease clearance.","evidence":"IFT88(orpk) hypomorphic chondrocytes with aggrecanase, LRP-1 imaging, and clearance assays","pmids":["29920219"],"confidence":"Medium","gaps":["Mechanism connecting IFT88 to LRP-1 trafficking not defined","Single-cell-type evidence"]},{"year":2018,"claim":"Mapped the IFT-B docking hierarchy further by showing IFT70 binds the IFT52–IFT88 dimer in a manner required for ciliogenesis.","evidence":"IFT70 double-KO cells, deletion mutagenesis, and Co-IP interaction mapping with functional rescue","pmids":["29654116"],"confidence":"High","gaps":["Higher-order IFT-B assembly order not fully ordered","Structural detail of the interface not resolved"]},{"year":2019,"claim":"Refined IFT88's mitotic function, showing it concentrates at k-fiber minus-ends and recruits NuMA for k-fiber re-anchoring and chromosome alignment.","evidence":"Laser ablation with IFT88 localization, Co-IP with NuMA, and nocodazole washout under depletion","pmids":["31312011"],"confidence":"Medium","gaps":["Direct vs scaffolded IFT88–NuMA binding not separated","Relationship to the spindle-pole dynein complex not integrated"]},{"year":2020,"claim":"Placed IFT88 downstream of CPAP/WDR62 in the ciliogenesis pathway, showing WDR62-mutant failure to recruit CPAP impairs IFT88 basal-body recruitment.","evidence":"CRISPR WDR62-mutant mice with CPAP/IFT88 basal-body imaging and radial glia differentiation assays","pmids":["31816041"],"confidence":"Medium","gaps":["Direct molecular link between CPAP and IFT88 recruitment not defined"]},{"year":2021,"claim":"Identified a cilium-independent role in periciliary membrane compartment organization that distinguishes IFT88 from kinesin-2.","evidence":"Comparative Ift88/Kif3a knockdown in MDCK cells and osm-5/osm-3 C. elegans mutants with exclusion assay","pmids":["34753064"],"confidence":"Medium","gaps":["Molecular mechanism of PCMC organization unknown","Direct membrane partners not identified"]},{"year":2021,"claim":"Linked IFT88 to autophagy regulation in the kidney, showing its loss suppresses cisplatin-induced autophagy and worsens acute kidney injury.","evidence":"Proximal-tubule-specific KO mice and HK-2 knockdown with autophagy flux assays and rescue","pmids":["34251272"],"confidence":"Medium","gaps":["Direct molecular step linking IFT88 to autophagy machinery unknown","Cilia-dependence not separated"]},{"year":2021,"claim":"Connected fibroblast IFT88 to ECM regulation and downstream cardiac electrophysiology, broadening its physiological footprint.","evidence":"siRNA in neonatal rat fibroblasts with CM-FB co-culture, electrical mapping, and ECM gene analysis","pmids":["36467697"],"confidence":"Medium","gaps":["Signaling pathway linking IFT88 to ECM genes not defined","Single co-culture model"]},{"year":2022,"claim":"Identified the upstream recruiter for spermatid IFT88, showing MEIG1 directs IFT88/IFT20 to the manchette as a complex.","evidence":"Co-IP from testis, Meig1 and conditional Ift20 KO localization, and sucrose gradient sedimentation","pmids":["35257720"],"confidence":"Medium","gaps":["Direct vs indirect MEIG1–IFT88 interaction not resolved","How the complex engages microtubule motors unaddressed"]},{"year":2024,"claim":"Established degradative control of IFT88, showing XIAP ubiquitinates it under TGF-β to promote fibrogenesis.","evidence":"XIAP E3 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the Expression of PTEN and Tg737.","date":"2023","source":"Journal of healthcare engineering","url":"https://pubmed.ncbi.nlm.nih.gov/37829384","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.12.687971","title":"Primary Cilia Dysfunction in Brown Fat Results in Fatal Thermogenesis Failure in Neonatal Mice","date":"2025-11-13","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.12.687971","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.16.682843","title":"Loss of ciliary proteins IFT20 and IFT88 results in defective phagocytosis and metabolism in the RPE","date":"2025-10-17","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.16.682843","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.09.08.674930","title":"Functionally Essential and Structurally Diverse: Insights into the zebrafish Left-Right Organizer’s Cilia via Optogenetic IFT88 Perturbation and Volume Electron Microscopy","date":"2025-09-09","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.08.674930","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.10.681644","title":"Complement Factor H and its  <i>C. elegans</i>  homolog regulate IFT52/OSM-6 and CNG channel localization in sensory neurons","date":"2025-10-13","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.10.681644","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.02.25.636485","title":"Remodelling of supernumerary leaflet primordia leads to bicuspid aortic valve (BAV) caused by loss of primary cilia","date":"2025-02-25","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.25.636485","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.08.20.670930","title":"Characterization of membrane structures regulating primary ciliogenesis by quantitative isotropic ultrastructure 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ossification","date":"2025-03-01","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.01.640937","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.07.617069","title":"TAOK2 Drives Opposing Cilia Length Deficits in 16p11.2 Deletion and Duplication Carriers","date":"2024-10-07","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.07.617069","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.02.616263","title":"Early intermittent low-dose sclerostin antibody treatment promotes surface bone formation and reduces bone loss, but also decreases osteocyte apoptosis and mechanotransduction in ovariectomized rats: a pilot 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":46325,"output_tokens":7125,"usd":0.122925,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16171,"output_tokens":7303,"usd":0.131715,"stage2_stop_reason":"end_turn"},"total_usd":0.25464,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"IFT88 (Chlamydomonas) / Tg737 (mouse) is required for assembly of cilia and flagella; Chlamydomonas insertional mutants lacking IFT88 have no flagella, and Tg737 mutant mice have shorter primary cilia in the kidney, demonstrating IFT88 is an essential IFT particle subunit for ciliary assembly in both unicellular and mammalian contexts.\",\n      \"method\": \"Insertional mutagenesis in Chlamydomonas; mouse mutant analysis with electron microscopy; cDNA cloning and sequence comparison\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and structural analysis across two organisms, replicated by multiple labs subsequently\",\n      \"pmids\": [\"11062270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"C. elegans OSM-5 (IFT88 ortholog) localizes to the cilium base and axoneme and undergoes intraflagellar transport particle movement within cilia, as shown by OSM-5::GFP time-lapse imaging; osm-5 mutants have ciliary defects consistent with a ciliogenic role.\",\n      \"method\": \"Transgenic GFP fusion rescue of osm-5 mutants; time-lapse live imaging; immunofluorescence; DAF-19 transcription factor regulation confirmed by expression analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live imaging of IFT particle movement with functional rescue, independently consistent with Chlamydomonas data\",\n      \"pmids\": [\"11290289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"IFT88/Tg737 protein localizes to photoreceptor connecting cilia, and loss-of-function mutation in Tg737/IFT88 causes abnormal outer segment development and retinal degeneration, demonstrating that IFT is required for photoreceptor outer segment assembly and maintenance.\",\n      \"method\": \"Immunolocalization of IFT particle proteins in photoreceptors; analysis of Tg737 mutant mouse retinal phenotype by electron microscopy and histology\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiment combined with KO phenotypic analysis in two orthogonal readouts\",\n      \"pmids\": [\"11916979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Transgenic re-expression of wild-type Tg737 cDNA in Tg737 mutant mice restores normal renal function and normal basolateral EGFr localization in collecting duct epithelium, directly confirming Tg737 as the causative gene for collecting duct cyst formation.\",\n      \"method\": \"Transgenic rescue experiment; renal function tests; immunohistochemistry for EGFr localization\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct transgenic rescue with functional readout, definitive causal assignment\",\n      \"pmids\": [\"8887283\"],\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, mediated by its TPR motifs. Overexpression prevents G1-S transition and induces apoptosis; RNAi depletion promotes cell-cycle progression to S, G2, and M phases. IFT88 interacts with Che-1, an Rb-binding protein that inhibits Rb growth-suppressing function.\",\n      \"method\": \"Immunofluorescence/fractionation for centrosomal localization; RNAi knockdown and overexpression with cell-cycle FACS analysis; Co-IP for IFT88–Che-1 interaction; TPR domain deletion mutagenesis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, mutagenesis, RNAi, OE) in single lab\",\n      \"pmids\": [\"17264151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In mitosis, IFT88 localizes to spindle poles and is part of a dynein1-driven complex that transports peripheral microtubule clusters containing microtubule-nucleating proteins to spindle poles to ensure proper astral microtubule array formation and spindle orientation. IFT88 depletion causes mitotic defects in human cells, Tg737(orpk) kidney cells, and zebrafish embryos.\",\n      \"method\": \"RNAi depletion in human cells; analysis of Tg737(orpk) mouse mutant kidney cells; zebrafish embryo knockdown; live-cell imaging of spindle dynamics; Co-IP for dynein1 complex\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple model systems, Co-IP for complex membership, live-cell imaging with functional spindle readout\",\n      \"pmids\": [\"21441926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"IFT88 directly interacts with IFT52 and IFT46 within IFT complex B, and these three proteins can form a ternary complex. The IFT52–IFT88 interaction was confirmed by chemical cross-linking.\",\n      \"method\": \"Yeast two-hybrid; bacterial coexpression pulldown; chemical cross-linking; in vivo electroporation rescue of ift46 mutant\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of binary and ternary complexes confirmed by two orthogonal biochemical methods\",\n      \"pmids\": [\"20435895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IFT70 interacts with the IFT52–IFT88 dimer within IFT-B; deletion of the first TPR repeat or the terminal α36 helix of IFT70 abolishes its interaction with the IFT52–IFT88 dimer and abrogates ciliogenesis rescue in IFT70 knockout cells.\",\n      \"method\": \"IFT70A/B double knockout cells; exogenous expression rescue; deletion mutagenesis of IFT70; Co-IP/pulldown to map IFT70–IFT52–IFT88 interaction\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with functional rescue and biochemical interaction mapping in KO cells\",\n      \"pmids\": [\"29654116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In maternal+zygotic ift88 mutant zebrafish embryos (which never form cilia), planar cell polarity (PCP) is established normally, demonstrating cilia are not required for PCP. However, IFT88 plays a cilia-independent role in controlling oriented cell divisions during gastrulation and neurulation.\",\n      \"method\": \"Generation of maternal+zygotic IFT88 zebrafish mutants; PCP marker analysis; division orientation measurements\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis using complete maternal+zygotic loss, two orthogonal phenotypic readouts\",\n      \"pmids\": [\"24095732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss of Ift88 impairs cell migration independently of cilia; Ift88-depleted MDCK cells show defective leading-edge polarization and fewer microtubules at the leading edge, without affecting MT dynamics or nucleation.\",\n      \"method\": \"siRNA knockdown in MDCK cells; wound-healing/migration assays; confocal microscopy of MT organization; cilia-deficient controls\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean KD with defined cellular phenotype, single lab, single primary method for MT analysis\",\n      \"pmids\": [\"26465598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DGKδ (an ER-resident lipid kinase) interacts with IFT88 and triggers release of IFT88-containing COPII-coated vesicles from ER exit sites (ERES), facilitating delivery of ciliary cargo toward the primary cilium. RNAi of DGKδ impairs IFT88 vesicle release and Hedgehog signaling.\",\n      \"method\": \"Co-IP of IFT88 with DGKδ; association with COPII vesicles by co-localization; RNAi and knockout strategies; Shh signaling reporter assays in vitro and in vivo\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional rescue, two methods, single lab\",\n      \"pmids\": [\"28706295\"],\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 to facilitate k-fiber re-anchoring into the spindle and proper chromosome alignment.\",\n      \"method\": \"MT laser ablation followed by IFT88 localization; Co-IP of IFT88 with NuMA; nocodazole washout with IFT88 depletion; chromosome alignment assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus laser ablation functional assay, single lab with two orthogonal approaches\",\n      \"pmids\": [\"31312011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IFT88 localizes to the trans-Golgi network of spermatids and is present in proacrosomal vesicles, along acrosome membranes, and the head-tail coupling apparatus. Loss of IFT88 causes abnormal spermatid head shaping, tail absence, and blockade of GMAP210-stained vesicle and mitochondrial progression through the manchette.\",\n      \"method\": \"Immunocytochemistry in wild-type and Ift88 mutant spermatids; Brefeldin-A and nocodazole disruption of Golgi/microtubules\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with functional KO phenotype, two orthogonal approaches (IHC + pharmacological disruption)\",\n      \"pmids\": [\"21337470\"],\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, IFT20, and IFT88 form a complex; in Meig1 KO mice, IFT88 and IFT20 are absent from the manchette and drift to lighter sucrose gradient fractions, while MEIG1 localization is unchanged in conditional Ift20 KO mice, placing MEIG1 upstream of IFT88 manchette targeting.\",\n      \"method\": \"Co-IP from mouse testis; Meig1 KO mouse analysis by immunofluorescence; sucrose gradient sedimentation; conditional Ift20 KO\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus KO localization analysis in two genetic backgrounds, single lab\",\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. Blocking XIAP-mediated IFT88 degradation ablates TGF-β-induced HSC activation and liver fibrosis. Ift88-KO mice are more susceptible to carbon tetrachloride-induced liver fibrosis.\",\n      \"method\": \"Mechanistic studies identifying XIAP as E3 ligase; ubiquitination assays; Ift88 KO mouse + CCl4 fibrosis model; rescue experiments blocking XIAP\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay plus in vivo KO with functional fibrosis readout, single lab\",\n      \"pmids\": [\"38351372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"UFL1 UFMylates IFT88 at lysine 572; this UFMylation antagonizes ubiquitination of IFT88 by PJA2 E3 ligase, preventing proteasomal degradation. A K572R mutant of IFT88 shows increased ubiquitination and reduced stability; UFL1 genetic ablation in mice causes severe ciliary defects in multiple tissues.\",\n      \"method\": \"UFMylation site mapping (K572); site-directed mutagenesis (K572R); ubiquitination assays; UFL1 KO mouse phenotyping; identification of PJA2 as the competing E3 ligase\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — PTM site mapping with mutagenesis, competing ligase identification, and in vivo KO phenotype in a single rigorous study\",\n      \"pmids\": [\"41272290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Disruption of IFT88 (hypomorphic mutation) redistributes LRP-1 receptor away from the ciliary base hot spot, increases LRP-1 shedding, and reduces the rate of extracellular protease (aggrecanase) clearance from chondrocytes, demonstrating an IFT88-dependent, Hedgehog-independent role in LRP-1-mediated endocytosis.\",\n      \"method\": \"IFT88(orpk) hypomorphic chondrocyte cell line; aggrecanase activity assay; confocal imaging of LRP-1 distribution; protease clearance assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional assay with hypomorphic mutant cells, single lab, multiple readouts\",\n      \"pmids\": [\"29920219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TCTN2 depletion causes leakage of IFT88 from the ciliary axoneme toward the basal body lumen; super-resolution microscopy shows IFT88 lumen occupancy also occurs in RPGRIP1L-depleted and cytochalasin D-treated cells, indicating the transition zone gates IFT88 compartmentalization.\",\n      \"method\": \"CRISPR/Cas9 TCTN2 KO; super-resolution (STORM/SIM) and widefield microscopy; quantitative localization analysis; siRPGRIP1L and cytochalasin D perturbations\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — super-resolution imaging with multiple genetic/pharmacological perturbations, single lab\",\n      \"pmids\": [\"29866362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Deletion of Ift88 in chondrocytes disrupts Hedgehog (Ihh) signaling, downregulates Sfrp5 (an extracellular Wnt antagonist that is a downstream Hh target), and leads to increased nuclear β-catenin and Wnt/β-catenin signaling specifically in growth plate columnar cells.\",\n      \"method\": \"Conditional Ift88 KO in chondrocytes; gene expression profiling; pathway analysis; in situ hybridization for Axin2, Lef1; immunohistochemistry for nuclear β-catenin; Shh treatment of rib chondrocytes\",\n      \"journal\": \"Journal of orthopaedic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with pathway analysis and functional follow-up, single lab\",\n      \"pmids\": [\"23034798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Loss of Ift88 in cranial neural crest cells (Wnt1-Cre;Ift88fl/fl mice) eliminates primary cilia from palatal mesenchyme, decreases neural crest cell proliferation, and downregulates Shh signaling in the palatal mesenchyme, leading to bilateral cleft lip and palate. Palatal mesenchyme-specific loss (Osr2KI-Cre;Ift88fl/fl) produces isolated cleft palate.\",\n      \"method\": \"Conditional KO mice (Wnt1-Cre and Osr2KI-Cre); immunofluorescence for cilia; Shh pathway analysis; cell proliferation assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two tissue-specific conditional KO lines with pathway and cellular phenotypic readouts, single lab\",\n      \"pmids\": [\"28069795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IFT88 deficiency in proximal tubular cells suppresses cisplatin-induced autophagy; autophagy activator Tat-beclin 1 partially rescues IFT88-associated cell death; re-expression of IFT88 partially restores autophagy in knockdown cells. Proximal tubule-specific IFT88 KO mice exhibit more severe AKI than wild-type upon cisplatin treatment.\",\n      \"method\": \"Proximal tubule-specific IFT88 KO mice; siRNA knockdown in HK-2 cells; autophagy flux assays; pharmacological autophagy activator rescue; IFT88 re-expression\",\n      \"journal\": \"American journal of physiology. Renal physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO plus cell rescue experiments with multiple autophagy readouts, single lab\",\n      \"pmids\": [\"34251272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IFT88 knockdown in fibroblasts causes significant upregulation of ECM genes (Fn1, Col1a1, Ctgf), reduces conduction velocity in cardiomyocyte monolayers, and increases conduction block, demonstrating that ciliary IFT88 in fibroblasts regulates ECM deposition and thereby cardiac electrophysiology.\",\n      \"method\": \"siRNA knockdown of Ift88 in neonatal rat fibroblasts; CM-FB co-culture; electrical mapping; gene expression analysis\",\n      \"journal\": \"Frontiers in physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean KD with defined cellular phenotype, single lab, co-culture model\",\n      \"pmids\": [\"36467697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WDR62 mutant proteins (V66M, R439H) localize to the basal body but fail to recruit CPAP; as a consequence, IFT88 recruitment is deficient, leading to impaired ciliogenesis and premature radial glia differentiation, placing CPAP upstream of IFT88 in the ciliogenesis pathway.\",\n      \"method\": \"CRISPR/Cas9 WDR62 mutant mice; immunofluorescence for CPAP and IFT88 at basal body; ciliogenesis and radial glia differentiation assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via CRISPR mutant mice, direct localization imaging, multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"31816041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Ift88, but not Kif3a (Kinesin-2 subunit), is required for establishment of the periciliary membrane compartment (PCMC) in MDCK cells and in C. elegans (osm-5 mutants lack PCMC while osm-3/kinesin-2 mutants form PCMC normally), revealing an IFT-B1-independent, cilium-independent function of IFT88 in PCMC organization.\",\n      \"method\": \"Ift88 KD in MDCK cells; C. elegans osm-5 and osm-3 mutant analysis; Kif3a KD comparison; fluorescent exclusion assay for PCMC; split IFT-B1 mutants\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — comparative genetic analysis in two model systems (mammalian + C. elegans), single lab\",\n      \"pmids\": [\"34753064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The human hTg737 gene encodes a protein containing tetratricopeptide repeat (TPR) motifs, is 95% identical to the mouse Tg737 protein, and maps to chromosome 13q12.1. It is broadly expressed including in kidney and liver.\",\n      \"method\": \"cDNA cloning and sequencing; chromosome mapping (FISH/hybrid panels); Northern blot expression analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — structural characterization and mapping, replicated by independent sequence analysis paper\",\n      \"pmids\": [\"7633404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Loss of primary cilia specifically in brown adipose tissue (BAT; Ucp1-Cre;Ift88 fl/fl) causes neonatal lethality from thermogenesis failure despite preserved UCP1 expression; the mechanism involves IFT88-dependent suppression of HMGCS2 downregulation and ROS production, impairing ketogenesis required for non-shivering thermogenesis. Neonatal lethality is rescued by thermoneutral housing or β-hydroxybutyrate supplementation.\",\n      \"method\": \"BAT-specific Ift88 conditional KO mice; metabolic assays (ketone body levels, ROS); qPCR for Hmgcs2; rescue by thermoneutral housing and β-HB supplementation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with molecular mechanism (HMGCS2/ketogenesis) and pharmacological rescue, single lab, preprint\",\n      \"pmids\": [\"bio_10.1101_2025.11.12.687971\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IFT88 is required for formation of tubular membrane intermediates (C-shaped and toroidal) during early ciliogenesis at the mother centriole; absence of IFT88 blocks progression through these membrane trafficking steps upstream of axoneme growth.\",\n      \"method\": \"3D volume EM (isotropic ultrastructure imaging) of IFT88-depleted cells; quantitative analysis of ciliogenesis membrane intermediates\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single structural imaging approach in preprint, no biochemical or mutagenesis follow-up reported for IFT88 specifically\",\n      \"pmids\": [\"bio_10.1101_2025.08.20.670930\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IFT88 inhibits TRPV4-mediated calcium influx in endplate chondrocytes; mechanistic studies show IFT88 negatively regulates its own transcription factor C/EBPα under abnormal stress and reduces TRPV4 hyperactivation, thereby lowering intracellular calcium, oxidative stress, and Wnt pathway activation. In vivo IFT88 overexpression maintains disc height and reduces endplate ossification.\",\n      \"method\": \"Molecular docking; co-immunoprecipitation; dual-luciferase assays; flow cytometry (calcium/ROS); rat tail crush model; IFT88 overexpression in vivo\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical methods plus in vivo functional rescue, single lab\",\n      \"pmids\": [\"40441296\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IFT88 is a TPR-repeat-containing subunit of IFT complex B that directly binds IFT52 and IFT46 to form the core IFT-B scaffold; it is transported bidirectionally along ciliary/flagellar microtubules and is essential for assembly and maintenance of primary cilia and flagella across eukaryotes. Beyond its canonical ciliary role, IFT88 is stabilized by UFL1-mediated UFMylation at K572 (which antagonizes PJA2-driven ubiquitination and proteasomal degradation) and is targeted for degradation by XIAP in response to TGF-β. In non-ciliated and dividing cells, IFT88 associates with centrosomes via its TPR motifs, interacts with the Rb-binding protein Che-1 to regulate G1-S transition, participates in a dynein1-driven complex that delivers microtubule-nucleating factors to spindle poles for astral microtubule formation and spindle orientation, and concentrates at k-fiber minus-ends where it recruits NuMA for k-fiber re-anchoring. IFT88 also has cilia-independent roles in cell migration (leading-edge MT organization) and oriented cell division during zebrafish gastrulation, and in spermatids it is recruited to the manchette by MEIG1 to support intramanchette transport for flagellum biogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"IFT88 is an essential, evolutionarily conserved subunit of intraflagellar transport (IFT) complex B that drives assembly and maintenance of cilia and flagella across eukaryotes, from Chlamydomonas and C. elegans to mammalian kidney and photoreceptors [#0, #1, #2]. Within IFT-B it is a TPR-motif protein that directly binds IFT52 and IFT46 to form a core ternary scaffold, which in turn docks IFT70 via the IFT52\\u2013IFT88 dimer—an interaction required for ciliogenesis [#6, #7]. IFT88 undergoes bidirectional IFT particle movement within the axoneme [#1], and its ciliary compartmentalization is gated by the transition zone [#17]. Cargo delivery toward the cilium depends on DGK\\u03b4-triggered release of IFT88-containing COPII vesicles from ER exit sites, supporting Hedgehog signaling [#10], and IFT88 recruitment to the basal body lies downstream of CPAP/WDR62 [#22]. Through ciliary Hedgehog signaling, IFT88 governs developmental programs including chondrocyte growth-plate signaling and Wnt/\\u03b2-catenin balance [#18] and cranial neural crest proliferation during palatogenesis, where its loss causes cleft lip and palate [#19]. Transgenic re-expression of Tg737/IFT88 rescues collecting-duct cystic kidney disease in mutant mice, establishing it as the causative gene [#3]. Beyond cilia, IFT88 has multiple non-ciliary roles: it localizes to centrosomes via its TPR motifs and interacts with the Rb-binding protein Che-1 to restrain the G1\\u2013S transition [#4]; it participates in a dynein1-driven complex that delivers microtubule-nucleating factors to spindle poles for astral microtubule formation and spindle orientation [#5]; it concentrates at k-fiber minus-ends to recruit NuMA for k-fiber re-anchoring [#11]; and it organizes leading-edge microtubules for cell migration and oriented cell division during gastrulation independently of cilia [#8, #9]. In spermatids, MEIG1 recruits IFT88 (with IFT20) to the manchette to support intramanchette transport for flagellum biogenesis [#12, #13]. IFT88 abundance is controlled by competing post-translational modifications: UFL1-mediated UFMylation at K572 antagonizes PJA2-driven ubiquitination and proteasomal degradation [#15], while XIAP ubiquitinates IFT88 in response to TGF-\\u03b2 to promote its degradation during fibrogenesis [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the foundational role of IFT88 as an essential IFT particle subunit required for ciliary and flagellar assembly, answering whether this protein is causally needed to build cilia.\",\n      \"evidence\": \"Insertional mutagenesis in Chlamydomonas and Tg737 mutant mouse analysis with EM\",\n      \"pmids\": [\"11062270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve where IFT88 sits within the IFT particle architecture\", \"Mechanism of transport not directly visualized\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrated that the IFT88 ortholog physically moves as part of IFT particles along the axoneme, linking the gene's loss-of-function phenotype to active transport behavior.\",\n      \"evidence\": \"GFP-fusion rescue and time-lapse live imaging in C. elegans osm-5 mutants\",\n      \"pmids\": [\"11290289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Motor and cargo specificity not defined\", \"Direct binding partners within IFT-B not identified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extended IFT88's ciliary requirement to specialized sensory cilia by showing it is needed for photoreceptor outer segment assembly and maintenance.\",\n      \"evidence\": \"Immunolocalization in connecting cilia plus Tg737 mutant retinal phenotyping\",\n      \"pmids\": [\"11916979\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific cargoes transported in photoreceptors not identified\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Provided definitive causal proof that Tg737/IFT88 is the gene responsible for cystic kidney disease by rescuing the phenotype with wild-type cDNA.\",\n      \"evidence\": \"Transgenic rescue with renal function and EGFr localization readouts\",\n      \"pmids\": [\"8887283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking ciliary defect to cystogenesis not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the molecular architecture by which IFT88 integrates into IFT-B, showing it directly binds IFT52 and IFT46 to form a core ternary scaffold.\",\n      \"evidence\": \"Yeast two-hybrid, bacterial co-expression pulldown, chemical cross-linking, and in vivo rescue\",\n      \"pmids\": [\"20435895\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full IFT-B stoichiometry and structure not resolved\", \"How the scaffold couples to motors unaddressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed an unexpected cilia-independent role at the centrosome and in cell-cycle control, showing IFT88 restrains G1\\u2013S transition via Che-1.\",\n      \"evidence\": \"Centrosomal fractionation, RNAi/overexpression with cell-cycle FACS, Co-IP, and TPR-deletion mutagenesis\",\n      \"pmids\": [\"17264151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Che-1 binding modulates Rb not detailed\", \"Single-lab observation of cell-cycle phenotype\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified a mitotic function in which IFT88 acts within a dynein1-driven complex delivering microtubule-nucleating factors to spindle poles for spindle orientation.\",\n      \"evidence\": \"RNAi across human cells, mouse Tg737(orpk) cells, and zebrafish embryos with live imaging and Co-IP\",\n      \"pmids\": [\"21441926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct nucleating cargo identity not fully defined\", \"How IFT88 selects mitotic vs ciliary roles unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed IFT88 functions in spermatid manchette-associated vesicle and organelle transport during flagellum biogenesis, broadening its trafficking role.\",\n      \"evidence\": \"Immunocytochemistry in wild-type/Ift88 mutant spermatids with BFA and nocodazole disruption\",\n      \"pmids\": [\"21337470\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream targeting machinery to the manchette not yet identified at this stage\", \"Direct cargo-binding mechanism not shown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected ciliary IFT88 to developmental signaling crosstalk, showing its loss disrupts Hedgehog and de-represses Wnt/\\u03b2-catenin in growth-plate chondrocytes.\",\n      \"evidence\": \"Conditional Ift88 KO in chondrocytes with expression profiling, in situ hybridization, and Shh treatment\",\n      \"pmids\": [\"23034798\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular step linking IFT88 to Sfrp5 not defined\", \"Single-lab pathway analysis\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Used complete maternal+zygotic loss to dissociate cilia from IFT88's role in oriented cell division, establishing a genuinely cilia-independent developmental function.\",\n      \"evidence\": \"Maternal+zygotic ift88 zebrafish mutants with PCP marker and division-orientation analysis\",\n      \"pmids\": [\"24095732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular effector for oriented division not identified\", \"Relationship to spindle-pole role not connected\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined a cilia-independent cytoskeletal role in cell migration, showing IFT88 organizes leading-edge microtubules without altering MT dynamics or nucleation.\",\n      \"evidence\": \"siRNA in MDCK cells with wound-healing assays and confocal MT imaging\",\n      \"pmids\": [\"26465598\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct MT-organizing partners not identified\", \"Single primary method for MT analysis\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved a step in ciliary cargo delivery, showing DGK\\u03b4 triggers release of IFT88-containing COPII vesicles from ER exit sites to feed Hedgehog signaling.\",\n      \"evidence\": \"Co-IP of IFT88 with DGK\\u03b4, COPII co-localization, and Shh reporter assays with RNAi\",\n      \"pmids\": [\"28706295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect IFT88\\u2013DGK\\u03b4 interaction not fully resolved\", \"Vesicle docking machinery downstream not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated a tissue-level developmental requirement, showing neural-crest IFT88 loss eliminates cilia, lowers Shh, and causes cleft lip and palate.\",\n      \"evidence\": \"Tissue-specific conditional KO mice (Wnt1-Cre, Osr2KI-Cre) with cilia, Shh, and proliferation readouts\",\n      \"pmids\": [\"28069795\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular target of Shh dysregulation not pinpointed\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed IFT88 downstream of the transition zone, showing transition-zone integrity gates IFT88 compartmentalization within the cilium.\",\n      \"evidence\": \"CRISPR TCTN2 KO with super-resolution imaging and RPGRIP1L/cytochalasin D perturbations\",\n      \"pmids\": [\"29866362\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular determinant of IFT88 gating not identified\", \"Functional consequence of lumen leakage not measured\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed a Hedgehog-independent role in receptor-mediated endocytosis, where IFT88 maintains LRP-1 ciliary-base distribution and protease clearance.\",\n      \"evidence\": \"IFT88(orpk) hypomorphic chondrocytes with aggrecanase, LRP-1 imaging, and clearance assays\",\n      \"pmids\": [\"29920219\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting IFT88 to LRP-1 trafficking not defined\", \"Single-cell-type evidence\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mapped the IFT-B docking hierarchy further by showing IFT70 binds the IFT52\\u2013IFT88 dimer in a manner required for ciliogenesis.\",\n      \"evidence\": \"IFT70 double-KO cells, deletion mutagenesis, and Co-IP interaction mapping with functional rescue\",\n      \"pmids\": [\"29654116\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Higher-order IFT-B assembly order not fully ordered\", \"Structural detail of the interface not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Refined IFT88's mitotic function, showing it concentrates at k-fiber minus-ends and recruits NuMA for k-fiber re-anchoring and chromosome alignment.\",\n      \"evidence\": \"Laser ablation with IFT88 localization, Co-IP with NuMA, and nocodazole washout under depletion\",\n      \"pmids\": [\"31312011\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs scaffolded IFT88\\u2013NuMA binding not separated\", \"Relationship to the spindle-pole dynein complex not integrated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placed IFT88 downstream of CPAP/WDR62 in the ciliogenesis pathway, showing WDR62-mutant failure to recruit CPAP impairs IFT88 basal-body recruitment.\",\n      \"evidence\": \"CRISPR WDR62-mutant mice with CPAP/IFT88 basal-body imaging and radial glia differentiation assays\",\n      \"pmids\": [\"31816041\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between CPAP and IFT88 recruitment not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified a cilium-independent role in periciliary membrane compartment organization that distinguishes IFT88 from kinesin-2.\",\n      \"evidence\": \"Comparative Ift88/Kif3a knockdown in MDCK cells and osm-5/osm-3 C. elegans mutants with exclusion assay\",\n      \"pmids\": [\"34753064\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of PCMC organization unknown\", \"Direct membrane partners not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked IFT88 to autophagy regulation in the kidney, showing its loss suppresses cisplatin-induced autophagy and worsens acute kidney injury.\",\n      \"evidence\": \"Proximal-tubule-specific KO mice and HK-2 knockdown with autophagy flux assays and rescue\",\n      \"pmids\": [\"34251272\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular step linking IFT88 to autophagy machinery unknown\", \"Cilia-dependence not separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected fibroblast IFT88 to ECM regulation and downstream cardiac electrophysiology, broadening its physiological footprint.\",\n      \"evidence\": \"siRNA in neonatal rat fibroblasts with CM-FB co-culture, electrical mapping, and ECM gene analysis\",\n      \"pmids\": [\"36467697\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signaling pathway linking IFT88 to ECM genes not defined\", \"Single co-culture model\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified the upstream recruiter for spermatid IFT88, showing MEIG1 directs IFT88/IFT20 to the manchette as a complex.\",\n      \"evidence\": \"Co-IP from testis, Meig1 and conditional Ift20 KO localization, and sucrose gradient sedimentation\",\n      \"pmids\": [\"35257720\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect MEIG1\\u2013IFT88 interaction not resolved\", \"How the complex engages microtubule motors unaddressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established degradative control of IFT88, showing XIAP ubiquitinates it under TGF-\\u03b2 to promote fibrogenesis.\",\n      \"evidence\": \"XIAP E3 identification, ubiquitination assays, and Ift88 KO + CCl4 liver fibrosis model with rescue\",\n      \"pmids\": [\"38351372\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination site not mapped in this study\", \"Cilia-dependence of the fibrosis effect not separated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a stabilizing post-translational switch, showing UFL1-mediated UFMylation at K572 antagonizes PJA2 ubiquitination to protect IFT88 and sustain ciliogenesis.\",\n      \"evidence\": \"UFMylation site mapping, K572R mutagenesis, ubiquitination assays, competing-ligase identification, and UFL1 KO mouse phenotyping\",\n      \"pmids\": [\"41272290\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals controlling UFL1 vs PJA2 balance not defined\", \"Structural effect of K572 modification unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Linked ciliary IFT88 to brown-fat thermogenesis via ketogenesis, showing its loss impairs HMGCS2-dependent \\u03b2-hydroxybutyrate production.\",\n      \"evidence\": \"BAT-specific Ift88 KO mice with metabolic assays and \\u03b2-HB/thermoneutral rescue (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.11.12.687971\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signaling link from cilia to HMGCS2 not defined\", \"Preprint, single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated IFT88 in early ciliogenesis membrane remodeling, showing it is required for tubular membrane intermediate formation at the mother centriole.\",\n      \"evidence\": \"3D volume EM of IFT88-depleted cells with quantitative intermediate analysis (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.08.20.670930\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single structural imaging approach with no biochemical follow-up\", \"Direct role vs indirect consequence of IFT loss not separated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified an ion-channel regulatory role, showing IFT88 suppresses TRPV4-mediated calcium influx and autoregulates C/EBP\\u03b1 in endplate chondrocytes.\",\n      \"evidence\": \"Docking, Co-IP, dual-luciferase, flow cytometry, and rat tail crush model with IFT88 overexpression\",\n      \"pmids\": [\"40441296\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct IFT88\\u2013TRPV4 interaction mechanism not resolved\", \"Cilia-dependence not separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How IFT88 partitions among its ciliary, centrosomal, mitotic, migratory, and trafficking roles—and what molecular signals or modifications select between them—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying mechanism distinguishing ciliary vs non-ciliary pools\", \"Structural basis of IFT-B incorporation vs centrosomal/spindle binding not defined\", \"Regulation of PTM-driven stability across tissues not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [4, 5, 9, 11]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 6, 7, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 2, 17]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [4, 5, 22]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [5, 9, 11]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [10, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 2, 7]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 18, 19]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 5, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 18, 19]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [10, 12]}\n    ],\n    \"complexes\": [\"IFT complex B\"],\n    \"partners\": [\"IFT52\", \"IFT46\", \"IFT70\", \"CHE-1/AATF\", \"NuMA\", \"DGKD\", \"MEIG1\", \"IFT20\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}