{"gene":"FUZ","run_date":"2026-06-09T23:54:44","timeline":{"discoveries":[{"year":2009,"finding":"Fuz is essential for membrane trafficking of cargo to basal bodies and to the apical tips of cilia, as well as for exocytosis in secretory cells; a Rab-related small GTPase was identified as a Fuz interaction partner also essential for ciliogenesis and secretion.","method":"In vivo mucociliary epithelium imaging, bioinformatics, co-immunoprecipitation/interaction partner identification, loss-of-function mouse mutant analysis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction partner identified, in vivo functional imaging in mucociliary epithelium, multiple orthogonal methods (imaging, genetics, binding partner ID), replicated across tissues","pmids":["19767740"],"is_preprint":false},{"year":2012,"finding":"Fuz is required for normal intraflagellar transport (IFT) dynamics in vertebrate cilia, specifically playing a role in retrograde IFT protein trafficking but not anterograde IFT, placing Fuz among known IFT effectors outside the core IFT machinery.","method":"In vivo IFT dynamics platform in Xenopus, live imaging of fluorescently tagged IFT components in Fuz loss-of-function","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo live imaging platform with direct quantification of IFT dynamics, directional specificity established, single lab but multiple IFT components analyzed","pmids":["22778277"],"is_preprint":false},{"year":2011,"finding":"Fuz loss-of-function in mice leads to down-regulation of Hedgehog signaling and up-regulation of canonical Wnt/β-catenin signaling in craniofacial tissues; Fuz expression itself is directly regulated by β-catenin/TCF binding to the Fuz promoter (demonstrated by chromatin immunoprecipitation).","method":"Fuz knockout mouse analysis, reporter assays, chromatin immunoprecipitation (ChIP) for β-catenin/TCF at Fuz promoter","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP provides direct evidence for transcriptional regulation, combined with reporter assays and in vivo KO phenotype; single lab","pmids":["21935430"],"is_preprint":false},{"year":2013,"finding":"In Fuz mutant mice, dysregulated Gli processing leads to excessive craniofacial Fgf8 gene expression; genetic reduction of Fgf8 ameliorates the maxillary phenotypes, establishing a Fuz → Gli processing → Fgf8 epistatic pathway in craniofacial development.","method":"Fuz mutant mouse genetic analysis, genetic epistasis (Fgf8 reduction in Fuz mutant background), gene expression analysis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis demonstrated by double-mutant rescue, mechanistic pathway (Fuz → Gli → Fgf8) established in vivo","pmids":["23806618"],"is_preprint":false},{"year":2010,"finding":"Fuz is required cell-autonomously for primary cilia formation in both epidermal and dermal cells; disruption of Fuz impairs Hedgehog signaling in skin, blocking hair follicle development, demonstrated by skin grafts and skin reconstitution assays.","method":"Fuz knockout mouse, skin grafts, skin reconstitution assays, primary cilia imaging","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reconstitution and graft assays establish cell-autonomy, multiple tissue contexts examined, single lab","pmids":["20962855"],"is_preprint":false},{"year":2018,"finding":"Overexpression of Fuz triggers neuronal apoptosis via a Dishevelled/Rac1 GTPase/MEKK1/JNK/caspase signaling axis; the transcriptional regulator YY1 binds the Fuz promoter and promotes its hypermethylation, repressing Fuz transcription, while YY1 sequestration by polyQ aggregates derepresses Fuz leading to neurodegeneration.","method":"Overexpression and loss-of-function in Drosophila neurodegeneration models and mammalian cells, signaling pathway analysis (Rac1/JNK/caspase), ChIP/promoter methylation analysis, co-immunoprecipitation of YY1 with Fuz promoter","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple model systems (Drosophila, cell culture), signaling axis defined by pathway inhibition, YY1–Fuz promoter interaction shown by ChIP; single lab","pmids":["30026307"],"is_preprint":false},{"year":2018,"finding":"FUZ interacts biochemically with BNIP3 protein; loss of FUZ decreases BNIP3 protein level without affecting BNIP3 mRNA, suggesting FUZ stabilizes BNIP3 protein post-translationally.","method":"Co-immunoprecipitation, siRNA knockdown, western blot vs. qRT-PCR comparison","journal":"Life sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP, single lab, no mutagenesis or mechanistic follow-up of the interaction","pmids":["29421438"],"is_preprint":false},{"year":2024,"finding":"Fuz is genetically epistatic to Gpr161 in Sonic hedgehog signaling during mouse neural tube development; FUZ protein biochemically interacts with GPR161 and regulates GPR161 ciliary localization, a process that may involve β-arrestin 2.","method":"Genetic epistasis analysis (double mutant mouse embryos), co-immunoprecipitation, ciliary trafficking assay","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis plus biochemical interaction plus ciliary localization assay; single lab, two orthogonal approaches","pmids":["39369306"],"is_preprint":false},{"year":2024,"finding":"FUZ protein encodes a subunit of the CPLANE complex; affinity-based LC-MS/MS on immunoprecipitated FUZ identified 289 FUZ-exclusive interactors and 159 co-interactors with GPR161, enriched for proteasomal catabolic processes and trafficking; FKBP8 was confirmed to interact exclusively with both FUZ and GPR161.","method":"Affinity-based liquid chromatography-tandem mass spectrometry (AP-LC-MS/MS) on immunoprecipitated FUZ and GPR161, co-immunoprecipitation validation of FKBP8","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — mass spectrometry interactome with Co-IP validation for FKBP8, but preprint, single lab, no functional follow-up","pmids":["41000683"],"is_preprint":true},{"year":2023,"finding":"FUZ, as a component of the CPLANE complex, is required for normal pituitary specification; in Fuz−/− mutants, Rathke's pouch forms but fails to express LHX3, undergoes apoptosis, and shows reduced SHH pathway activation, with downstream abnormal FGF8 and BMP4 patterning.","method":"Fuz knockout mouse histology, immunofluorescence for SHH pathway components and LHX3, FGF8/BMP4 expression analysis","journal":"Journal of anatomy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined cellular phenotype (LHX3 loss, apoptosis) and pathway readout (SHH, FGF8, BMP4); single lab","pmids":["37794731"],"is_preprint":false}],"current_model":"FUZ (CPLANE3) is a planar cell polarity effector and subunit of the CPLANE complex that functions primarily to enable ciliogenesis by trafficking membrane and IFT cargo to basal bodies and facilitating retrograde (but not anterograde) intraflagellar transport; through its essential role in primary cilia formation it regulates Sonic Hedgehog/Gli processing, canonical Wnt/β-catenin signaling, and FGF signaling during vertebrate embryonic development, and additionally can trigger neuronal apoptosis via a Dishevelled/Rac1/MEKK1/JNK/caspase axis, with its own transcription controlled by β-catenin/TCF and YY1-mediated promoter methylation."},"narrative":{"mechanistic_narrative":"FUZ (CPLANE3) is a planar cell polarity effector and CPLANE complex subunit that enables ciliogenesis by directing membrane and intraflagellar transport (IFT) cargo to basal bodies and the apical tips of cilia [PMID:19767740]. It acts cell-autonomously to build primary cilia and is required specifically for retrograde, but not anterograde, IFT dynamics, placing it among IFT effectors outside the core IFT machinery [PMID:22778277, PMID:20962855]. Through its role in cilium function, FUZ governs Sonic Hedgehog/Gli processing during vertebrate development: loss of Fuz dysregulates Gli processing, which drives excessive craniofacial Fgf8 expression in an epistatic Fuz → Gli → Fgf8 pathway, while concurrently down-regulating Hedgehog and up-regulating canonical Wnt/β-catenin signaling in craniofacial tissues [PMID:21935430, PMID:23806618]. The same ciliary/Hedgehog circuit is required for pituitary specification, where Fuz loss causes failure of LHX3 expression, apoptosis of Rathke's pouch, and reduced SHH activation with downstream FGF8/BMP4 mispatterning [PMID:37794731]. Mechanistically, FUZ binds GPR161 and regulates its ciliary localization, sitting genetically epistatic to Gpr161 in neural tube Hedgehog signaling [PMID:39369306]. FUZ transcription is itself controlled by β-catenin/TCF binding to its promoter [PMID:21935430]. Beyond ciliogenesis, overexpressed Fuz triggers neuronal apoptosis through a Dishevelled/Rac1/MEKK1/JNK/caspase axis, with YY1-mediated promoter hypermethylation normally repressing Fuz [PMID:30026307].","teleology":[{"year":2009,"claim":"Established the core cellular function of Fuz by showing it traffics cargo to basal bodies and ciliary tips and supports exocytosis, answering what molecular process underlies its requirement in ciliated/secretory cells.","evidence":"In vivo mucociliary epithelium imaging, co-IP partner identification (Rab-related GTPase), and loss-of-function mouse analysis","pmids":["19767740"],"confidence":"High","gaps":["Identity and direct biochemical role of the Rab-related GTPase partner not fully defined","Does not resolve which step of trafficking FUZ acts at molecularly"]},{"year":2010,"claim":"Showed Fuz is required cell-autonomously for primary cilia formation and that its loss blocks Hedgehog-dependent hair follicle development, linking the ciliary defect to a tissue phenotype.","evidence":"Fuz knockout mouse with skin grafts and skin reconstitution assays plus cilia imaging","pmids":["20962855"],"confidence":"Medium","gaps":["Mechanism by which cilia loss impairs Hedgehog not detailed at molecular level","Single lab"]},{"year":2011,"claim":"Connected Fuz to opposing signaling outputs (Hedgehog down, Wnt/β-catenin up) and revealed a feedback loop in which β-catenin/TCF directly regulates Fuz transcription.","evidence":"Fuz knockout mouse phenotyping, reporter assays, and ChIP for β-catenin/TCF at the Fuz promoter","pmids":["21935430"],"confidence":"Medium","gaps":["Whether Wnt up-regulation is a direct consequence or secondary to cilia loss is unresolved","Single lab"]},{"year":2012,"claim":"Resolved the directional specificity of Fuz in IFT, showing it is needed for retrograde but not anterograde transport, refining its placement as a non-core IFT effector.","evidence":"In vivo Xenopus IFT dynamics platform with live imaging of tagged IFT components in Fuz LOF","pmids":["22778277"],"confidence":"High","gaps":["Molecular mechanism linking FUZ to the retrograde IFT machinery not defined","Whether FUZ binds IFT components directly is unknown"]},{"year":2013,"claim":"Defined an epistatic developmental pathway (Fuz → Gli processing → Fgf8) by showing genetic reduction of Fgf8 rescues craniofacial defects in Fuz mutants.","evidence":"Fuz mutant mouse genetics with double-mutant Fgf8 reduction and gene expression analysis","pmids":["23806618"],"confidence":"High","gaps":["Biochemical step at which Gli processing fails is not specified","Other Gli targets beyond Fgf8 not mapped"]},{"year":2018,"claim":"Uncovered a non-ciliary pro-apoptotic role: Fuz overexpression drives neuronal death via a Dishevelled/Rac1/MEKK1/JNK/caspase axis, with YY1-mediated promoter methylation normally repressing Fuz.","evidence":"Drosophila neurodegeneration models and mammalian cells, pathway inhibition, ChIP/promoter methylation, YY1–promoter co-IP","pmids":["30026307"],"confidence":"Medium","gaps":["Relationship between this apoptotic activity and the ciliary function unclear","Direct molecular link from FUZ to Dishevelled not established","Single lab"]},{"year":2018,"claim":"Reported a candidate post-translational role in stabilizing BNIP3 protein, raising a possible FUZ function beyond ciliogenesis.","evidence":"Co-IP, siRNA knockdown, western blot vs qRT-PCR comparison","pmids":["29421438"],"confidence":"Low","gaps":["Single Co-IP without reciprocal validation or mutagenesis","Mechanism of stabilization unknown","Functional consequence not tested"]},{"year":2023,"claim":"Extended FUZ/CPLANE requirement to pituitary organogenesis, showing Fuz loss causes Rathke's pouch apoptosis, LHX3 failure, and reduced SHH with FGF8/BMP4 mispatterning.","evidence":"Fuz knockout mouse histology and immunofluorescence for SHH components, LHX3, FGF8, BMP4","pmids":["37794731"],"confidence":"Medium","gaps":["Whether the defect is purely cilia-dependent not isolated","Single lab"]},{"year":2024,"claim":"Identified GPR161 as a FUZ partner and Hedgehog-pathway substrate of FUZ function, showing FUZ regulates GPR161 ciliary localization and is genetically epistatic to Gpr161.","evidence":"Double-mutant mouse epistasis, co-IP, and ciliary trafficking assay","pmids":["39369306"],"confidence":"Medium","gaps":["Role of β-arrestin 2 not confirmed","Direct vs indirect nature of GPR161 trafficking regulation unresolved","Single lab"]},{"year":2024,"claim":"Mapped a FUZ interactome enriched for proteasomal/catabolic and trafficking processes, confirming FUZ as a CPLANE subunit and identifying FKBP8 as a shared FUZ/GPR161 partner.","evidence":"AP-LC-MS/MS on immunoprecipitated FUZ and GPR161 with Co-IP validation of FKBP8 (preprint)","pmids":["41000683"],"confidence":"Low","gaps":["Preprint, single lab, no functional follow-up","Bulk interactors not individually validated","Significance of proteasomal enrichment untested"]},{"year":null,"claim":"How FUZ molecularly couples to the retrograde IFT machinery and to GPR161 trafficking, and how its ciliary role relates to its proposed non-ciliary apoptotic and protein-stabilization activities, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of FUZ within CPLANE","Direct substrate/cargo binding mechanism undefined","Reconciliation of ciliary vs apoptotic functions absent"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,7]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,3,7]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,4,9]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1]}],"complexes":["CPLANE complex"],"partners":["GPR161","FKBP8","BNIP3","YY1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BT04","full_name":"Protein fuzzy homolog","aliases":[],"length_aa":418,"mass_kda":45.7,"function":"Probable planar cell polarity effector involved in cilium biogenesis. May regulate protein and membrane transport to the cilium. Proposed to function as core component of the CPLANE (ciliogenesis and planar polarity effectors) complex involved in the recruitment of peripheral IFT-A proteins to basal bodies. May regulate the morphogenesis of hair follicles which depends on functional primary cilia. Binds phosphatidylinositol 3-phosphate with highest affinity, followed by phosphatidylinositol 4-phosphate and phosphatidylinositol 5-phosphate (By similarity)","subcellular_location":"Cytoplasm; Cytoplasm, cytoskeleton; Cytoplasm, cytoskeleton, cilium basal body","url":"https://www.uniprot.org/uniprotkb/Q9BT04/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FUZ","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":[],"url":"https://opencell.sf.czbiohub.org/search/FUZ","total_profiled":1310},"omim":[{"mim_id":"613580","title":"WD REPEAT-CONTAINING PLANAR CELL POLARITY EFFECTOR; WDPCP","url":"https://www.omim.org/entry/613580"},{"mim_id":"610622","title":"FUZZY PLANAR CELL POLARITY PROTEIN; FUZ","url":"https://www.omim.org/entry/610622"},{"mim_id":"610621","title":"INTURNED PLANAR CELL POLARITY PROTEIN; INTU","url":"https://www.omim.org/entry/610621"},{"mim_id":"182940","title":"NEURAL TUBE DEFECTS, SUSCEPTIBILITY TO; NTD","url":"https://www.omim.org/entry/182940"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":76.2}],"url":"https://www.proteinatlas.org/search/FUZ"},"hgnc":{"alias_symbol":["FLJ22688","Fy","CPLANE3"],"prev_symbol":[]},"alphafold":{"accession":"Q9BT04","domains":[{"cath_id":"3.30.450.70","chopping":"8-140","consensus_level":"high","plddt":92.0431,"start":8,"end":140},{"cath_id":"3.30.450.30","chopping":"157-283","consensus_level":"high","plddt":92.3676,"start":157,"end":283},{"cath_id":"3.30.450","chopping":"295-342_361-416","consensus_level":"high","plddt":86.9941,"start":295,"end":416}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BT04","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BT04-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BT04-F1-predicted_aligned_error_v6.png","plddt_mean":87.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FUZ","jax_strain_url":"https://www.jax.org/strain/search?query=FUZ"},"sequence":{"accession":"Q9BT04","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BT04.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BT04/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BT04"}},"corpus_meta":[{"pmid":"19767740","id":"PMC_19767740","title":"The planar cell polarity effector Fuz is essential for targeted membrane trafficking, ciliogenesis and mouse embryonic development.","date":"2009","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/19767740","citation_count":195,"is_preprint":false},{"pmid":"23806618","id":"PMC_23806618","title":"Fuz mutant mice reveal shared mechanisms between ciliopathies and FGF-related syndromes.","date":"2013","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/23806618","citation_count":78,"is_preprint":false},{"pmid":"21935430","id":"PMC_21935430","title":"Fuz regulates craniofacial development through tissue specific responses to signaling factors.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21935430","citation_count":53,"is_preprint":false},{"pmid":"22778277","id":"PMC_22778277","title":"Control of vertebrate intraflagellar transport by the planar cell polarity effector Fuz.","date":"2012","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/22778277","citation_count":52,"is_preprint":false},{"pmid":"20962855","id":"PMC_20962855","title":"Fuz controls the morphogenesis and differentiation of hair follicles through the formation of primary cilia.","date":"2010","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/20962855","citation_count":33,"is_preprint":false},{"pmid":"30026307","id":"PMC_30026307","title":"Planar cell polarity gene Fuz triggers apoptosis in neurodegenerative disease models.","date":"2018","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/30026307","citation_count":23,"is_preprint":false},{"pmid":"33658400","id":"PMC_33658400","title":"Pan-cancer investigation reveals mechanistic insights of planar cell polarity gene Fuz in carcinogenesis.","date":"2021","source":"Aging","url":"https://pubmed.ncbi.nlm.nih.gov/33658400","citation_count":13,"is_preprint":false},{"pmid":"37794731","id":"PMC_37794731","title":"The Fuzzy planar cell polarity protein (FUZ), necessary for primary cilium formation, is essential for pituitary development.","date":"2023","source":"Journal of anatomy","url":"https://pubmed.ncbi.nlm.nih.gov/37794731","citation_count":8,"is_preprint":false},{"pmid":"29421438","id":"PMC_29421438","title":"In vitro study of FUZ as a novel potential therapeutic target in non-small-cell lung cancer.","date":"2018","source":"Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/29421438","citation_count":7,"is_preprint":false},{"pmid":"35711836","id":"PMC_35711836","title":"Fuzzy Planar Cell Polarity Gene (FUZ) Promtes Cell Glycolysis, Migration, and Invasion in Non-small Cell Lung Cancer via the Phosphoinositide 3-Kinase/Protein Kinase B Pathway.","date":"2022","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/35711836","citation_count":5,"is_preprint":false},{"pmid":"39369306","id":"PMC_39369306","title":"Linkage between Fuz and Gpr161 genes regulates sonic hedgehog signaling during mouse neural tube development.","date":"2024","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/39369306","citation_count":2,"is_preprint":false},{"pmid":"38501709","id":"PMC_38501709","title":"Disruption of Fuz in mouse embryos generates hypoplastic hindbrain development and reduced cranial nerve ganglia.","date":"2024","source":"Developmental dynamics : an official publication of the American Association of Anatomists","url":"https://pubmed.ncbi.nlm.nih.gov/38501709","citation_count":1,"is_preprint":false},{"pmid":"38260275","id":"PMC_38260275","title":"The novel linkage between Fuz and Gpr161 genes regulates sonic hedgehog signaling during mouse embryonic development.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/38260275","citation_count":1,"is_preprint":false},{"pmid":"41000683","id":"PMC_41000683","title":"Identification of novel interacting proteins of FUZ and GPR161.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/41000683","citation_count":0,"is_preprint":false},{"pmid":"37577618","id":"PMC_37577618","title":"Disruption of Fuz in mouse embryos generates hypoplastic hindbrain development and reduced cranial nerve ganglia.","date":"2023","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/37577618","citation_count":0,"is_preprint":false},{"pmid":"41952398","id":"PMC_41952398","title":"Phenotypic Expansion and Molecular Implications in Recessive FUZ-Related Ciliopathy.","date":"2026","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/41952398","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":9295,"output_tokens":2507,"usd":0.032745,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9727,"output_tokens":3461,"usd":0.06758,"stage2_stop_reason":"end_turn"},"total_usd":0.100325,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"Fuz is essential for membrane trafficking of cargo to basal bodies and to the apical tips of cilia, as well as for exocytosis in secretory cells; a Rab-related small GTPase was identified as a Fuz interaction partner also essential for ciliogenesis and secretion.\",\n      \"method\": \"In vivo mucociliary epithelium imaging, bioinformatics, co-immunoprecipitation/interaction partner identification, loss-of-function mouse mutant analysis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction partner identified, in vivo functional imaging in mucociliary epithelium, multiple orthogonal methods (imaging, genetics, binding partner ID), replicated across tissues\",\n      \"pmids\": [\"19767740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Fuz is required for normal intraflagellar transport (IFT) dynamics in vertebrate cilia, specifically playing a role in retrograde IFT protein trafficking but not anterograde IFT, placing Fuz among known IFT effectors outside the core IFT machinery.\",\n      \"method\": \"In vivo IFT dynamics platform in Xenopus, live imaging of fluorescently tagged IFT components in Fuz loss-of-function\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo live imaging platform with direct quantification of IFT dynamics, directional specificity established, single lab but multiple IFT components analyzed\",\n      \"pmids\": [\"22778277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Fuz loss-of-function in mice leads to down-regulation of Hedgehog signaling and up-regulation of canonical Wnt/β-catenin signaling in craniofacial tissues; Fuz expression itself is directly regulated by β-catenin/TCF binding to the Fuz promoter (demonstrated by chromatin immunoprecipitation).\",\n      \"method\": \"Fuz knockout mouse analysis, reporter assays, chromatin immunoprecipitation (ChIP) for β-catenin/TCF at Fuz promoter\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP provides direct evidence for transcriptional regulation, combined with reporter assays and in vivo KO phenotype; single lab\",\n      \"pmids\": [\"21935430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In Fuz mutant mice, dysregulated Gli processing leads to excessive craniofacial Fgf8 gene expression; genetic reduction of Fgf8 ameliorates the maxillary phenotypes, establishing a Fuz → Gli processing → Fgf8 epistatic pathway in craniofacial development.\",\n      \"method\": \"Fuz mutant mouse genetic analysis, genetic epistasis (Fgf8 reduction in Fuz mutant background), gene expression analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis demonstrated by double-mutant rescue, mechanistic pathway (Fuz → Gli → Fgf8) established in vivo\",\n      \"pmids\": [\"23806618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Fuz is required cell-autonomously for primary cilia formation in both epidermal and dermal cells; disruption of Fuz impairs Hedgehog signaling in skin, blocking hair follicle development, demonstrated by skin grafts and skin reconstitution assays.\",\n      \"method\": \"Fuz knockout mouse, skin grafts, skin reconstitution assays, primary cilia imaging\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reconstitution and graft assays establish cell-autonomy, multiple tissue contexts examined, single lab\",\n      \"pmids\": [\"20962855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Overexpression of Fuz triggers neuronal apoptosis via a Dishevelled/Rac1 GTPase/MEKK1/JNK/caspase signaling axis; the transcriptional regulator YY1 binds the Fuz promoter and promotes its hypermethylation, repressing Fuz transcription, while YY1 sequestration by polyQ aggregates derepresses Fuz leading to neurodegeneration.\",\n      \"method\": \"Overexpression and loss-of-function in Drosophila neurodegeneration models and mammalian cells, signaling pathway analysis (Rac1/JNK/caspase), ChIP/promoter methylation analysis, co-immunoprecipitation of YY1 with Fuz promoter\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple model systems (Drosophila, cell culture), signaling axis defined by pathway inhibition, YY1–Fuz promoter interaction shown by ChIP; single lab\",\n      \"pmids\": [\"30026307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FUZ interacts biochemically with BNIP3 protein; loss of FUZ decreases BNIP3 protein level without affecting BNIP3 mRNA, suggesting FUZ stabilizes BNIP3 protein post-translationally.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, western blot vs. qRT-PCR comparison\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP, single lab, no mutagenesis or mechanistic follow-up of the interaction\",\n      \"pmids\": [\"29421438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Fuz is genetically epistatic to Gpr161 in Sonic hedgehog signaling during mouse neural tube development; FUZ protein biochemically interacts with GPR161 and regulates GPR161 ciliary localization, a process that may involve β-arrestin 2.\",\n      \"method\": \"Genetic epistasis analysis (double mutant mouse embryos), co-immunoprecipitation, ciliary trafficking assay\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis plus biochemical interaction plus ciliary localization assay; single lab, two orthogonal approaches\",\n      \"pmids\": [\"39369306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FUZ protein encodes a subunit of the CPLANE complex; affinity-based LC-MS/MS on immunoprecipitated FUZ identified 289 FUZ-exclusive interactors and 159 co-interactors with GPR161, enriched for proteasomal catabolic processes and trafficking; FKBP8 was confirmed to interact exclusively with both FUZ and GPR161.\",\n      \"method\": \"Affinity-based liquid chromatography-tandem mass spectrometry (AP-LC-MS/MS) on immunoprecipitated FUZ and GPR161, co-immunoprecipitation validation of FKBP8\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mass spectrometry interactome with Co-IP validation for FKBP8, but preprint, single lab, no functional follow-up\",\n      \"pmids\": [\"41000683\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FUZ, as a component of the CPLANE complex, is required for normal pituitary specification; in Fuz−/− mutants, Rathke's pouch forms but fails to express LHX3, undergoes apoptosis, and shows reduced SHH pathway activation, with downstream abnormal FGF8 and BMP4 patterning.\",\n      \"method\": \"Fuz knockout mouse histology, immunofluorescence for SHH pathway components and LHX3, FGF8/BMP4 expression analysis\",\n      \"journal\": \"Journal of anatomy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined cellular phenotype (LHX3 loss, apoptosis) and pathway readout (SHH, FGF8, BMP4); single lab\",\n      \"pmids\": [\"37794731\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FUZ (CPLANE3) is a planar cell polarity effector and subunit of the CPLANE complex that functions primarily to enable ciliogenesis by trafficking membrane and IFT cargo to basal bodies and facilitating retrograde (but not anterograde) intraflagellar transport; through its essential role in primary cilia formation it regulates Sonic Hedgehog/Gli processing, canonical Wnt/β-catenin signaling, and FGF signaling during vertebrate embryonic development, and additionally can trigger neuronal apoptosis via a Dishevelled/Rac1/MEKK1/JNK/caspase axis, with its own transcription controlled by β-catenin/TCF and YY1-mediated promoter methylation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FUZ (CPLANE3) is a planar cell polarity effector and CPLANE complex subunit that enables ciliogenesis by directing membrane and intraflagellar transport (IFT) cargo to basal bodies and the apical tips of cilia [#0]. It acts cell-autonomously to build primary cilia and is required specifically for retrograde, but not anterograde, IFT dynamics, placing it among IFT effectors outside the core IFT machinery [#1, #4]. Through its role in cilium function, FUZ governs Sonic Hedgehog/Gli processing during vertebrate development: loss of Fuz dysregulates Gli processing, which drives excessive craniofacial Fgf8 expression in an epistatic Fuz \\u2192 Gli \\u2192 Fgf8 pathway, while concurrently down-regulating Hedgehog and up-regulating canonical Wnt/\\u03b2-catenin signaling in craniofacial tissues [#2, #3]. The same ciliary/Hedgehog circuit is required for pituitary specification, where Fuz loss causes failure of LHX3 expression, apoptosis of Rathke's pouch, and reduced SHH activation with downstream FGF8/BMP4 mispatterning [#9]. Mechanistically, FUZ binds GPR161 and regulates its ciliary localization, sitting genetically epistatic to Gpr161 in neural tube Hedgehog signaling [#7]. FUZ transcription is itself controlled by \\u03b2-catenin/TCF binding to its promoter [#2]. Beyond ciliogenesis, overexpressed Fuz triggers neuronal apoptosis through a Dishevelled/Rac1/MEKK1/JNK/caspase axis, with YY1-mediated promoter hypermethylation normally repressing Fuz [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established the core cellular function of Fuz by showing it traffics cargo to basal bodies and ciliary tips and supports exocytosis, answering what molecular process underlies its requirement in ciliated/secretory cells.\",\n      \"evidence\": \"In vivo mucociliary epithelium imaging, co-IP partner identification (Rab-related GTPase), and loss-of-function mouse analysis\",\n      \"pmids\": [\"19767740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity and direct biochemical role of the Rab-related GTPase partner not fully defined\", \"Does not resolve which step of trafficking FUZ acts at molecularly\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed Fuz is required cell-autonomously for primary cilia formation and that its loss blocks Hedgehog-dependent hair follicle development, linking the ciliary defect to a tissue phenotype.\",\n      \"evidence\": \"Fuz knockout mouse with skin grafts and skin reconstitution assays plus cilia imaging\",\n      \"pmids\": [\"20962855\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which cilia loss impairs Hedgehog not detailed at molecular level\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected Fuz to opposing signaling outputs (Hedgehog down, Wnt/\\u03b2-catenin up) and revealed a feedback loop in which \\u03b2-catenin/TCF directly regulates Fuz transcription.\",\n      \"evidence\": \"Fuz knockout mouse phenotyping, reporter assays, and ChIP for \\u03b2-catenin/TCF at the Fuz promoter\",\n      \"pmids\": [\"21935430\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Wnt up-regulation is a direct consequence or secondary to cilia loss is unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the directional specificity of Fuz in IFT, showing it is needed for retrograde but not anterograde transport, refining its placement as a non-core IFT effector.\",\n      \"evidence\": \"In vivo Xenopus IFT dynamics platform with live imaging of tagged IFT components in Fuz LOF\",\n      \"pmids\": [\"22778277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking FUZ to the retrograde IFT machinery not defined\", \"Whether FUZ binds IFT components directly is unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined an epistatic developmental pathway (Fuz \\u2192 Gli processing \\u2192 Fgf8) by showing genetic reduction of Fgf8 rescues craniofacial defects in Fuz mutants.\",\n      \"evidence\": \"Fuz mutant mouse genetics with double-mutant Fgf8 reduction and gene expression analysis\",\n      \"pmids\": [\"23806618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical step at which Gli processing fails is not specified\", \"Other Gli targets beyond Fgf8 not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Uncovered a non-ciliary pro-apoptotic role: Fuz overexpression drives neuronal death via a Dishevelled/Rac1/MEKK1/JNK/caspase axis, with YY1-mediated promoter methylation normally repressing Fuz.\",\n      \"evidence\": \"Drosophila neurodegeneration models and mammalian cells, pathway inhibition, ChIP/promoter methylation, YY1\\u2013promoter co-IP\",\n      \"pmids\": [\"30026307\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship between this apoptotic activity and the ciliary function unclear\", \"Direct molecular link from FUZ to Dishevelled not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reported a candidate post-translational role in stabilizing BNIP3 protein, raising a possible FUZ function beyond ciliogenesis.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, western blot vs qRT-PCR comparison\",\n      \"pmids\": [\"29421438\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation or mutagenesis\", \"Mechanism of stabilization unknown\", \"Functional consequence not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended FUZ/CPLANE requirement to pituitary organogenesis, showing Fuz loss causes Rathke's pouch apoptosis, LHX3 failure, and reduced SHH with FGF8/BMP4 mispatterning.\",\n      \"evidence\": \"Fuz knockout mouse histology and immunofluorescence for SHH components, LHX3, FGF8, BMP4\",\n      \"pmids\": [\"37794731\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the defect is purely cilia-dependent not isolated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified GPR161 as a FUZ partner and Hedgehog-pathway substrate of FUZ function, showing FUZ regulates GPR161 ciliary localization and is genetically epistatic to Gpr161.\",\n      \"evidence\": \"Double-mutant mouse epistasis, co-IP, and ciliary trafficking assay\",\n      \"pmids\": [\"39369306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Role of \\u03b2-arrestin 2 not confirmed\", \"Direct vs indirect nature of GPR161 trafficking regulation unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped a FUZ interactome enriched for proteasomal/catabolic and trafficking processes, confirming FUZ as a CPLANE subunit and identifying FKBP8 as a shared FUZ/GPR161 partner.\",\n      \"evidence\": \"AP-LC-MS/MS on immunoprecipitated FUZ and GPR161 with Co-IP validation of FKBP8 (preprint)\",\n      \"pmids\": [\"41000683\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint, single lab, no functional follow-up\", \"Bulk interactors not individually validated\", \"Significance of proteasomal enrichment untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How FUZ molecularly couples to the retrograde IFT machinery and to GPR161 trafficking, and how its ciliary role relates to its proposed non-ciliary apoptotic and protein-stabilization activities, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of FUZ within CPLANE\", \"Direct substrate/cargo binding mechanism undefined\", \"Reconciliation of ciliary vs apoptotic functions absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 4, 9]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [\"CPLANE complex\"],\n    \"partners\": [\"GPR161\", \"FKBP8\", \"BNIP3\", \"YY1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}