{"gene":"IFT43","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2011,"finding":"IFT43 is a subunit of the IFT complex A (IFT-A) machinery. A homozygous mutation in the initiation codon of IFT43 (C14ORF179) disrupts translation, producing a shorter protein from a downstream ATG. In patient fibroblasts, loss of IFT43 disrupts retrograde ciliary transport (from ciliary tip to base), causing IFT-B proteins to accumulate at the ciliary tip while anterograde transport remains functional.","method":"Western blot (translation effect), immunofluorescence of IFT proteins in ciliated fibroblast cell lines from Sensenbrenner syndrome patients","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal use of antibodies against IFT proteins in patient-derived cells, two orthogonal methods (western blot + ciliary immunofluorescence), with functional consequence (IFT-B tip accumulation) clearly demonstrated","pmids":["21378380"],"is_preprint":false},{"year":2011,"finding":"IFT43 directly interacts with IFT121 within the IFT-A complex. IFT43 and IFT121 form the 'peripheral' or 'satellite' subcomplex of IFT-A, distinct from the core IFT144/IFT140/IFT122 subcomplex. A significant fraction of cell-body IFT43 exists as a ~2S species not associated with the full IFT-A complex, suggesting it can exist independently.","method":"Yeast two-hybrid analysis, recombinant protein co-expression in E. coli (pulldown), sucrose density gradient centrifugation, antibody pulldowns, analysis of ift121 and ift122 mutants in Chlamydomonas reinhardtii","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (yeast 2-hybrid, recombinant protein pulldown, sucrose gradients, mutant analysis) in a single focused study; Chlamydomonas is an established ortholog system for IFT","pmids":["22170070"],"is_preprint":false},{"year":2016,"finding":"IFT43 is part of the peripheral subcomplex of IFT-A (together with IFT121/IFT139), distinct from the core subcomplex (IFT122/IFT140/IFT144). The peripheral subcomplex associates with the core via IFT121-IFT122 interaction. IFT139-knockout cells (peripheral subunit) accumulate IFT-A, IFT-B, and GPCRs (Smoothened, GPR161) at bulged ciliary tips, phenocopying IFT43 peripheral subcomplex disruption, while IFT144-KO (core) blocks ciliary entry of GPCRs.","method":"Visible immunoprecipitation (VIP) assay for protein-protein interactions, CRISPR/Cas9 knockout of IFT139 and IFT144 in hTERT-RPE1 cells, immunofluorescence of ciliary GPCRs","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstitution-level protein interaction assay (VIP) plus genetic KO with defined ciliary phenotype; distinct phenotypes between core and peripheral KO cells provide strong mechanistic resolution","pmids":["27932497"],"is_preprint":false},{"year":2013,"finding":"The small GTPase Rsg1 is required for appropriate cytoplasmic localization of the retrograde IFT-A protein IFT43 in multiciliated cells. Loss of Rsg1 impairs axonemal IFT dynamics and leads to mislocalization of IFT43.","method":"Loss-of-function (morpholino knockdown) in Xenopus multiciliated cells, live imaging of IFT dynamics, immunofluorescence for IFT43 localization","journal":"Cilia","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean loss-of-function with defined localization phenotype for IFT43, but single lab and single model organism","pmids":["24192041"],"is_preprint":false},{"year":2014,"finding":"IFT43 (tagged with OFP) moves as retrograde IFT particles in primary cilia of mouse renal epithelial (IMCD-3) cells at ~0.45 µm/s, the same velocity as anterograde IFT proteins (KIF3B, IFT20) and BBSome protein BBS8, indicating IFT43 is transported as part of the IFT machinery.","method":"Live fluorescence imaging of fluorescently tagged IFT43 (OFP::IFT43) in IMCD-3 cells; velocity measurements","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct live-imaging subcellular localization experiment with functional implication (transport velocity), single lab","pmids":["25243405"],"is_preprint":false},{"year":2017,"finding":"In Chlamydomonas, loss of IFT54 (an IFT-B component) causes accumulation of IFT-A component IFT43 (along with IFT-B component IFT46) at the flagellar tip in stunted flagella, indicating IFT54 functions in IFT turnaround at the flagellar tip and that IFT43 tip accumulation is a readout of defective retrograde IFT.","method":"Genetic complementation in Chlamydomonas ift54 mutants expressing CC domain alone; immunofluorescence/immunoblot for IFT43 in flagella","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic complementation with defined IFT43 accumulation phenotype, single lab, IFT43 is the readout rather than the subject of manipulation","pmids":["28417161"],"is_preprint":false},{"year":2017,"finding":"Mutations in IFT43 disrupt ciliogenesis in patient-derived cells and produce abnormalities in cartilage growth plate architecture (disordered chondrocyte proliferation and differentiation), contributing to altered endochondral ossification and mineralization. IFT43 is identified as a 'satellite' member of the retrograde IFT-A complex that directly interacts with IFT121.","method":"Whole-exome sequencing, histological analysis of cartilage growth plates in SRPS patients, ciliogenesis assay in patient-derived cells","journal":"Cilia","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — loss-of-function (patient mutations) with specific cellular phenotype (ciliogenesis defect) and tissue-level readout (growth plate), single study","pmids":["28400947"],"is_preprint":false},{"year":2017,"finding":"A homozygous missense mutation in IFT43 (c.100 G>A) causes recessive retinal degeneration. Mutant IFT43 expression in mIMCD3 and MDCK cells produces significantly shorter cilia compared to wild-type IFT43. IFT43 protein localizes to the tip of cilia in transfected cells and to photoreceptors in the retina.","method":"Heterologous expression of wild-type and mutant IFT43 in mIMCD3 and MDCK cells; immunostaining for subcellular localization; cilium length measurement; RT-PCR, western blot, immunohistochemistry","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional assay (cilia length) with wild-type vs. mutant comparison, localization data, multiple orthogonal methods, single lab","pmids":["28973684"],"is_preprint":false},{"year":2020,"finding":"Under simulated microgravity (SMG), the ratio of anterograde (IFT88) to retrograde (IFT43-labeled) IFT particle number increases and IFT particle size decreases in osteocyte cilia, demonstrating that IFT43-labeled retrograde particles can be quantified as a direct readout of retrograde IFT transport in living osteocytes.","method":"Live fluorescence imaging of OFP::IFT43 (retrograde) and GFP::IFT88 (anterograde) in osteocytes under simulated microgravity; particle counting and size measurement","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — IFT43 used as a retrograde transport marker; functional role of IFT43 itself not directly tested, single lab","pmids":["32828281"],"is_preprint":false},{"year":2025,"finding":"IFT43 physically interacts with the prostaglandin E receptor 4 (EP4) GPCR through EP4's third intracellular loop (IC3) and C-terminal region. IFT43 and Rab23 GTPase cooperate to regulate EP4 trafficking to primary cilia. siRNA knockdown of IFT43 impairs ciliary localization of EP4 in zebrafish and mammalian cells.","method":"High-content siRNA screening; co-immunoprecipitation between EP4 and IFT43; domain mapping by deletion constructs; immunofluorescence of EP4 in cilia after IFT43 knockdown in zebrafish and mammalian cells","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP for physical interaction, siRNA loss-of-function with specific ciliary trafficking phenotype, domain mapping, replicated in multiple cell systems","pmids":["41372612"],"is_preprint":false},{"year":2026,"finding":"Loss of Ift43 in mice causes mid-gestation lethality with severe craniofacial defects, exencephaly, and limb patterning defects. At the cellular level, Ift43 deficiency reduces cilia number and length, blocks Gli1 induction after Hedgehog pathway activation (SAG treatment), causes abnormal accumulation of Gli2 and Gli3 at ciliary tips before stimulation, and fails to suppress Gli repressor forms after activation. Ift43 overexpression increases basal Gli2 cleavage into repressor form. Smoothened relocalizes to cilia normally in Ift43 mutants.","method":"Conditional/constitutive mouse knockout (Ift43 null); immunofluorescence for Gli2, Gli3, Smoothened in cilia; Hedgehog pathway activation assay (SAG); Gli1 mRNA induction; Ift43 overexpression with Gli2 cleavage assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse KO with multiple orthogonal readouts (cilia morphology, Gli localization, pathway activation, repressor processing); preprint, not yet peer-reviewed","pmids":["41648367"],"is_preprint":true},{"year":2016,"finding":"Haploinsufficiency of IFT43 (due to a de novo 14q24.2q24.3 microdeletion) in patient-derived fibroblasts results in increased accumulation of IFT-B proteins at the ciliary tip, demonstrating defective retrograde ciliary transport even with partial IFT43 loss.","method":"Immunocytochemistry for IFT-B proteins in fibroblasts from a patient with a heterozygous IFT43 deletion; comparison to control cells","journal":"American journal of medical genetics. Part A","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient, single immunofluorescence method, haploinsufficiency context complicates interpretation","pmids":["26892345"],"is_preprint":false}],"current_model":"IFT43 is the smallest subunit of the peripheral subcomplex (with IFT121/IFT139) of the IFT-A complex, where it directly binds IFT121; it is essential for retrograde ciliary transport (tip-to-base), and its loss causes IFT-B protein accumulation at ciliary tips, reduced cilia number and length, impaired ciliary entry and trafficking of GPCRs (including EP4, Smoothened, GPR161) via physical interaction with cargo receptors and cooperation with Rab23, and disrupted Hedgehog signal transduction by preventing proper Gli2/Gli3 processing and ciliary exit, thereby linking IFT-A retrograde transport to Gli activator/repressor balance."},"narrative":{"mechanistic_narrative":"IFT43 is a small subunit of the intraflagellar transport complex A (IFT-A) that is essential for retrograde ciliary transport from the ciliary tip back to the base [PMID:21378380]. Within IFT-A it directly binds IFT121 and, together with IFT139, forms a 'peripheral' or 'satellite' subcomplex that associates with the IFT122/IFT140/IFT144 core via an IFT121–IFT122 interaction; a fraction of cellular IFT43 also exists independently of the assembled complex [PMID:22170070, PMID:27932497]. Consistent with its role in the transport machinery, IFT43 moves as retrograde IFT particles within cilia at the same velocity as the anterograde machinery [PMID:25243405], and its loss causes abnormal accumulation of IFT-B proteins at the ciliary tip while anterograde transport persists [PMID:21378380]. Disruption of IFT43 reduces cilia number and length and impairs ciliogenesis [PMID:28973684, PMID:41648367], and it regulates the ciliary trafficking of GPCR cargo: IFT43 physically binds the EP4 receptor through its third intracellular loop and C-terminus and cooperates with the GTPase Rab23 to deliver EP4 to cilia [PMID:41372612]. IFT43 is required for Hedgehog signal transduction, where its loss blocks Gli1 induction, causes Gli2/Gli3 to accumulate at ciliary tips, and prevents proper resolution of Gli activator and repressor forms [PMID:41648367]. Mutations in IFT43 cause human ciliopathies including Sensenbrenner syndrome [PMID:21378380], short-rib polydactyly syndrome with growth-plate abnormalities [PMID:28400947], and recessive retinal degeneration [PMID:28973684].","teleology":[{"year":2011,"claim":"Established that IFT43 is a component of the IFT-A machinery specifically required for retrograde, not anterograde, ciliary transport, defining its core cellular function.","evidence":"Western blot of a translation-disrupting mutation and ciliary immunofluorescence of IFT proteins in Sensenbrenner syndrome patient fibroblasts","pmids":["21378380"],"confidence":"High","gaps":["Did not resolve IFT43's position or binding partners within IFT-A","Mechanism of retrograde turnaround not addressed"]},{"year":2011,"claim":"Defined IFT43's molecular placement by showing it directly binds IFT121 and exists partly as a free pool, indicating a distinct peripheral arm of IFT-A.","evidence":"Yeast two-hybrid, recombinant pulldown, sucrose gradients and mutant analysis in Chlamydomonas","pmids":["22170070"],"confidence":"High","gaps":["Function of the free ~2S IFT43 pool unknown","How the peripheral arm engages the core not resolved in this study"]},{"year":2016,"claim":"Resolved IFT-A architecture, placing IFT43 in a peripheral subcomplex (IFT43/IFT121/IFT139) that attaches to the core via IFT121-IFT122, and linked peripheral disruption to GPCR mistrafficking.","evidence":"Visible immunoprecipitation interaction mapping and CRISPR knockout of IFT139 vs IFT144 in hTERT-RPE1 cells with ciliary GPCR imaging","pmids":["27932497"],"confidence":"High","gaps":["IFT43 itself was inferred from IFT139-KO phenocopy rather than directly knocked out here","Mechanism coupling peripheral arm to retrograde motor unresolved"]},{"year":2013,"claim":"Identified an upstream regulator, showing the small GTPase Rsg1 controls cytoplasmic localization of IFT43 in multiciliated cells.","evidence":"Morpholino knockdown and live IFT imaging in Xenopus multiciliated cells","pmids":["24192041"],"confidence":"Medium","gaps":["Direct Rsg1-IFT43 interaction not demonstrated","Single model organism and single lab"]},{"year":2014,"claim":"Demonstrated IFT43 is physically conveyed as retrograde IFT cargo by measuring its transport velocity in cilia.","evidence":"Live fluorescence imaging of OFP::IFT43 in mouse IMCD-3 cells with velocity quantification","pmids":["25243405"],"confidence":"Medium","gaps":["Does not establish what drives IFT43 turnaround at the tip","Single lab"]},{"year":2017,"claim":"Used IFT43 tip accumulation as a readout to show the IFT-B protein IFT54 mediates tip turnaround, contextualizing IFT43 within the retrograde handoff.","evidence":"Genetic complementation in Chlamydomonas ift54 mutants with IFT43 immunofluorescence/immunoblot","pmids":["28417161"],"confidence":"Medium","gaps":["IFT43 is the readout, not the manipulated subject","Direct IFT43-IFT54 relationship not tested"]},{"year":2017,"claim":"Linked IFT43 dysfunction to specific human ciliopathies, connecting its ciliogenesis role to skeletal and retinal disease.","evidence":"Exome sequencing, growth-plate histology and ciliogenesis assays in SRPS patient cells; mutant IFT43 expression and cilium-length assays in mIMCD3/MDCK cells for retinal degeneration","pmids":["28400947","28973684"],"confidence":"Medium","gaps":["Molecular basis of the cilia-shortening phenotype not defined","Tissue-specific requirements not dissected"]},{"year":2025,"claim":"Defined a direct cargo-handling role, showing IFT43 binds the EP4 GPCR and cooperates with Rab23 to traffic it into cilia.","evidence":"siRNA screen, reciprocal co-IP and domain mapping with EP4, and ciliary EP4 imaging in zebrafish and mammalian cells","pmids":["41372612"],"confidence":"Medium","gaps":["Whether IFT43-EP4 binding is direct or complex-mediated not fully resolved","Mechanism of Rab23 cooperation unknown"]},{"year":2026,"claim":"Established the in vivo requirement of IFT43 for development and Hedgehog signaling via control of ciliary Gli2/Gli3 dynamics and activator/repressor balance.","evidence":"Mouse Ift43 knockout with Gli2/Gli3/Smoothened ciliary imaging, SAG-induced Gli1 induction, and Gli2 cleavage assays (preprint)","pmids":["41648367"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Direct IFT43-Gli interaction not shown","How retrograde transport mechanistically governs Gli processing unresolved"]},{"year":null,"claim":"It remains unresolved how IFT43, as the peripheral arm of IFT-A, mechanistically couples retrograde transport to selective GPCR cargo loading and to Gli processing.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of IFT43 within an assembled retrograde train","Direct cargo-recognition mechanism for GPCRs beyond EP4 not defined","Link between transport defect and Gli activator/repressor balance not mechanistically resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,9]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,4,7]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,3]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[4]}],"complexes":["IFT-A complex","IFT-A peripheral subcomplex (IFT43/IFT121/IFT139)"],"partners":["IFT121","IFT139","EP4","RAB23"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96FT9","full_name":"Intraflagellar transport protein 43 homolog","aliases":[],"length_aa":208,"mass_kda":23.5,"function":"As a component of IFT complex A (IFT-A), a complex required for retrograde ciliary transport and entry into cilia of G protein-coupled receptors (GPCRs), it is involved in ciliogenesis (PubMed:28400947, PubMed:28973684). Involved in retrograde ciliary transport along microtubules from the ciliary tip to the base (PubMed:21378380)","subcellular_location":"Cytoplasm, cytoskeleton; Cell projection, cilium","url":"https://www.uniprot.org/uniprotkb/Q96FT9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/IFT43","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/IFT43","total_profiled":1310},"omim":[{"mim_id":"617871","title":"RETINITIS PIGMENTOSA 81; RP81","url":"https://www.omim.org/entry/617871"},{"mim_id":"617866","title":"SHORT-RIB THORACIC DYSPLASIA 18 WITH POLYDACTYLY; SRTD18","url":"https://www.omim.org/entry/617866"},{"mim_id":"614378","title":"CRANIOECTODERMAL DYSPLASIA 4; CED4","url":"https://www.omim.org/entry/614378"},{"mim_id":"614099","title":"CRANIOECTODERMAL DYSPLASIA 3; CED3","url":"https://www.omim.org/entry/614099"},{"mim_id":"614091","title":"SHORT-RIB THORACIC DYSPLASIA 7 WITH OR WITHOUT POLYDACTYLY; SRTD7","url":"https://www.omim.org/entry/614091"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Microtubules","reliability":"Supported"},{"location":"Primary cilium","reliability":"Supported"},{"location":"Principal piece","reliability":"Supported"},{"location":"End piece","reliability":"Supported"},{"location":"Cytokinetic bridge","reliability":"Additional"},{"location":"Mitotic spindle","reliability":"Additional"},{"location":"Centriolar satellite","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"},{"location":"Perinuclear theca","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/IFT43"},"hgnc":{"alias_symbol":["FLJ32173","MGC16028"],"prev_symbol":["C14orf179"]},"alphafold":{"accession":"Q96FT9","domains":[{"cath_id":"-","chopping":"129-167","consensus_level":"medium","plddt":78.2482,"start":129,"end":167}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96FT9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96FT9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96FT9-F1-predicted_aligned_error_v6.png","plddt_mean":63.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=IFT43","jax_strain_url":"https://www.jax.org/strain/search?query=IFT43"},"sequence":{"accession":"Q96FT9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96FT9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96FT9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96FT9"}},"corpus_meta":[{"pmid":"22791528","id":"PMC_22791528","title":"Ciliary disorder of the skeleton.","date":"2012","source":"American journal of medical genetics. 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A homozygous mutation in the initiation codon of IFT43 (C14ORF179) disrupts translation, producing a shorter protein from a downstream ATG. In patient fibroblasts, loss of IFT43 disrupts retrograde ciliary transport (from ciliary tip to base), causing IFT-B proteins to accumulate at the ciliary tip while anterograde transport remains functional.\",\n      \"method\": \"Western blot (translation effect), immunofluorescence of IFT proteins in ciliated fibroblast cell lines from Sensenbrenner syndrome patients\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal use of antibodies against IFT proteins in patient-derived cells, two orthogonal methods (western blot + ciliary immunofluorescence), with functional consequence (IFT-B tip accumulation) clearly demonstrated\",\n      \"pmids\": [\"21378380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IFT43 directly interacts with IFT121 within the IFT-A complex. IFT43 and IFT121 form the 'peripheral' or 'satellite' subcomplex of IFT-A, distinct from the core IFT144/IFT140/IFT122 subcomplex. A significant fraction of cell-body IFT43 exists as a ~2S species not associated with the full IFT-A complex, suggesting it can exist independently.\",\n      \"method\": \"Yeast two-hybrid analysis, recombinant protein co-expression in E. coli (pulldown), sucrose density gradient centrifugation, antibody pulldowns, analysis of ift121 and ift122 mutants in Chlamydomonas reinhardtii\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (yeast 2-hybrid, recombinant protein pulldown, sucrose gradients, mutant analysis) in a single focused study; Chlamydomonas is an established ortholog system for IFT\",\n      \"pmids\": [\"22170070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"IFT43 is part of the peripheral subcomplex of IFT-A (together with IFT121/IFT139), distinct from the core subcomplex (IFT122/IFT140/IFT144). The peripheral subcomplex associates with the core via IFT121-IFT122 interaction. IFT139-knockout cells (peripheral subunit) accumulate IFT-A, IFT-B, and GPCRs (Smoothened, GPR161) at bulged ciliary tips, phenocopying IFT43 peripheral subcomplex disruption, while IFT144-KO (core) blocks ciliary entry of GPCRs.\",\n      \"method\": \"Visible immunoprecipitation (VIP) assay for protein-protein interactions, CRISPR/Cas9 knockout of IFT139 and IFT144 in hTERT-RPE1 cells, immunofluorescence of ciliary GPCRs\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstitution-level protein interaction assay (VIP) plus genetic KO with defined ciliary phenotype; distinct phenotypes between core and peripheral KO cells provide strong mechanistic resolution\",\n      \"pmids\": [\"27932497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The small GTPase Rsg1 is required for appropriate cytoplasmic localization of the retrograde IFT-A protein IFT43 in multiciliated cells. Loss of Rsg1 impairs axonemal IFT dynamics and leads to mislocalization of IFT43.\",\n      \"method\": \"Loss-of-function (morpholino knockdown) in Xenopus multiciliated cells, live imaging of IFT dynamics, immunofluorescence for IFT43 localization\",\n      \"journal\": \"Cilia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean loss-of-function with defined localization phenotype for IFT43, but single lab and single model organism\",\n      \"pmids\": [\"24192041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"IFT43 (tagged with OFP) moves as retrograde IFT particles in primary cilia of mouse renal epithelial (IMCD-3) cells at ~0.45 µm/s, the same velocity as anterograde IFT proteins (KIF3B, IFT20) and BBSome protein BBS8, indicating IFT43 is transported as part of the IFT machinery.\",\n      \"method\": \"Live fluorescence imaging of fluorescently tagged IFT43 (OFP::IFT43) in IMCD-3 cells; velocity measurements\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct live-imaging subcellular localization experiment with functional implication (transport velocity), single lab\",\n      \"pmids\": [\"25243405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Chlamydomonas, loss of IFT54 (an IFT-B component) causes accumulation of IFT-A component IFT43 (along with IFT-B component IFT46) at the flagellar tip in stunted flagella, indicating IFT54 functions in IFT turnaround at the flagellar tip and that IFT43 tip accumulation is a readout of defective retrograde IFT.\",\n      \"method\": \"Genetic complementation in Chlamydomonas ift54 mutants expressing CC domain alone; immunofluorescence/immunoblot for IFT43 in flagella\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic complementation with defined IFT43 accumulation phenotype, single lab, IFT43 is the readout rather than the subject of manipulation\",\n      \"pmids\": [\"28417161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Mutations in IFT43 disrupt ciliogenesis in patient-derived cells and produce abnormalities in cartilage growth plate architecture (disordered chondrocyte proliferation and differentiation), contributing to altered endochondral ossification and mineralization. IFT43 is identified as a 'satellite' member of the retrograde IFT-A complex that directly interacts with IFT121.\",\n      \"method\": \"Whole-exome sequencing, histological analysis of cartilage growth plates in SRPS patients, ciliogenesis assay in patient-derived cells\",\n      \"journal\": \"Cilia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — loss-of-function (patient mutations) with specific cellular phenotype (ciliogenesis defect) and tissue-level readout (growth plate), single study\",\n      \"pmids\": [\"28400947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A homozygous missense mutation in IFT43 (c.100 G>A) causes recessive retinal degeneration. Mutant IFT43 expression in mIMCD3 and MDCK cells produces significantly shorter cilia compared to wild-type IFT43. IFT43 protein localizes to the tip of cilia in transfected cells and to photoreceptors in the retina.\",\n      \"method\": \"Heterologous expression of wild-type and mutant IFT43 in mIMCD3 and MDCK cells; immunostaining for subcellular localization; cilium length measurement; RT-PCR, western blot, immunohistochemistry\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional assay (cilia length) with wild-type vs. mutant comparison, localization data, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"28973684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Under simulated microgravity (SMG), the ratio of anterograde (IFT88) to retrograde (IFT43-labeled) IFT particle number increases and IFT particle size decreases in osteocyte cilia, demonstrating that IFT43-labeled retrograde particles can be quantified as a direct readout of retrograde IFT transport in living osteocytes.\",\n      \"method\": \"Live fluorescence imaging of OFP::IFT43 (retrograde) and GFP::IFT88 (anterograde) in osteocytes under simulated microgravity; particle counting and size measurement\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — IFT43 used as a retrograde transport marker; functional role of IFT43 itself not directly tested, single lab\",\n      \"pmids\": [\"32828281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IFT43 physically interacts with the prostaglandin E receptor 4 (EP4) GPCR through EP4's third intracellular loop (IC3) and C-terminal region. IFT43 and Rab23 GTPase cooperate to regulate EP4 trafficking to primary cilia. siRNA knockdown of IFT43 impairs ciliary localization of EP4 in zebrafish and mammalian cells.\",\n      \"method\": \"High-content siRNA screening; co-immunoprecipitation between EP4 and IFT43; domain mapping by deletion constructs; immunofluorescence of EP4 in cilia after IFT43 knockdown in zebrafish and mammalian cells\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP for physical interaction, siRNA loss-of-function with specific ciliary trafficking phenotype, domain mapping, replicated in multiple cell systems\",\n      \"pmids\": [\"41372612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Loss of Ift43 in mice causes mid-gestation lethality with severe craniofacial defects, exencephaly, and limb patterning defects. At the cellular level, Ift43 deficiency reduces cilia number and length, blocks Gli1 induction after Hedgehog pathway activation (SAG treatment), causes abnormal accumulation of Gli2 and Gli3 at ciliary tips before stimulation, and fails to suppress Gli repressor forms after activation. Ift43 overexpression increases basal Gli2 cleavage into repressor form. Smoothened relocalizes to cilia normally in Ift43 mutants.\",\n      \"method\": \"Conditional/constitutive mouse knockout (Ift43 null); immunofluorescence for Gli2, Gli3, Smoothened in cilia; Hedgehog pathway activation assay (SAG); Gli1 mRNA induction; Ift43 overexpression with Gli2 cleavage assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse KO with multiple orthogonal readouts (cilia morphology, Gli localization, pathway activation, repressor processing); preprint, not yet peer-reviewed\",\n      \"pmids\": [\"41648367\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Haploinsufficiency of IFT43 (due to a de novo 14q24.2q24.3 microdeletion) in patient-derived fibroblasts results in increased accumulation of IFT-B proteins at the ciliary tip, demonstrating defective retrograde ciliary transport even with partial IFT43 loss.\",\n      \"method\": \"Immunocytochemistry for IFT-B proteins in fibroblasts from a patient with a heterozygous IFT43 deletion; comparison to control cells\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient, single immunofluorescence method, haploinsufficiency context complicates interpretation\",\n      \"pmids\": [\"26892345\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IFT43 is the smallest subunit of the peripheral subcomplex (with IFT121/IFT139) of the IFT-A complex, where it directly binds IFT121; it is essential for retrograde ciliary transport (tip-to-base), and its loss causes IFT-B protein accumulation at ciliary tips, reduced cilia number and length, impaired ciliary entry and trafficking of GPCRs (including EP4, Smoothened, GPR161) via physical interaction with cargo receptors and cooperation with Rab23, and disrupted Hedgehog signal transduction by preventing proper Gli2/Gli3 processing and ciliary exit, thereby linking IFT-A retrograde transport to Gli activator/repressor balance.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"IFT43 is a small subunit of the intraflagellar transport complex A (IFT-A) that is essential for retrograde ciliary transport from the ciliary tip back to the base [#0]. Within IFT-A it directly binds IFT121 and, together with IFT139, forms a 'peripheral' or 'satellite' subcomplex that associates with the IFT122/IFT140/IFT144 core via an IFT121–IFT122 interaction; a fraction of cellular IFT43 also exists independently of the assembled complex [#1, #2]. Consistent with its role in the transport machinery, IFT43 moves as retrograde IFT particles within cilia at the same velocity as the anterograde machinery [#4], and its loss causes abnormal accumulation of IFT-B proteins at the ciliary tip while anterograde transport persists [#0]. Disruption of IFT43 reduces cilia number and length and impairs ciliogenesis [#7, #10], and it regulates the ciliary trafficking of GPCR cargo: IFT43 physically binds the EP4 receptor through its third intracellular loop and C-terminus and cooperates with the GTPase Rab23 to deliver EP4 to cilia [#9]. IFT43 is required for Hedgehog signal transduction, where its loss blocks Gli1 induction, causes Gli2/Gli3 to accumulate at ciliary tips, and prevents proper resolution of Gli activator and repressor forms [#10]. Mutations in IFT43 cause human ciliopathies including Sensenbrenner syndrome [#0], short-rib polydactyly syndrome with growth-plate abnormalities [#6], and recessive retinal degeneration [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that IFT43 is a component of the IFT-A machinery specifically required for retrograde, not anterograde, ciliary transport, defining its core cellular function.\",\n      \"evidence\": \"Western blot of a translation-disrupting mutation and ciliary immunofluorescence of IFT proteins in Sensenbrenner syndrome patient fibroblasts\",\n      \"pmids\": [\"21378380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve IFT43's position or binding partners within IFT-A\", \"Mechanism of retrograde turnaround not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined IFT43's molecular placement by showing it directly binds IFT121 and exists partly as a free pool, indicating a distinct peripheral arm of IFT-A.\",\n      \"evidence\": \"Yeast two-hybrid, recombinant pulldown, sucrose gradients and mutant analysis in Chlamydomonas\",\n      \"pmids\": [\"22170070\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of the free ~2S IFT43 pool unknown\", \"How the peripheral arm engages the core not resolved in this study\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved IFT-A architecture, placing IFT43 in a peripheral subcomplex (IFT43/IFT121/IFT139) that attaches to the core via IFT121-IFT122, and linked peripheral disruption to GPCR mistrafficking.\",\n      \"evidence\": \"Visible immunoprecipitation interaction mapping and CRISPR knockout of IFT139 vs IFT144 in hTERT-RPE1 cells with ciliary GPCR imaging\",\n      \"pmids\": [\"27932497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"IFT43 itself was inferred from IFT139-KO phenocopy rather than directly knocked out here\", \"Mechanism coupling peripheral arm to retrograde motor unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified an upstream regulator, showing the small GTPase Rsg1 controls cytoplasmic localization of IFT43 in multiciliated cells.\",\n      \"evidence\": \"Morpholino knockdown and live IFT imaging in Xenopus multiciliated cells\",\n      \"pmids\": [\"24192041\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct Rsg1-IFT43 interaction not demonstrated\", \"Single model organism and single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated IFT43 is physically conveyed as retrograde IFT cargo by measuring its transport velocity in cilia.\",\n      \"evidence\": \"Live fluorescence imaging of OFP::IFT43 in mouse IMCD-3 cells with velocity quantification\",\n      \"pmids\": [\"25243405\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish what drives IFT43 turnaround at the tip\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Used IFT43 tip accumulation as a readout to show the IFT-B protein IFT54 mediates tip turnaround, contextualizing IFT43 within the retrograde handoff.\",\n      \"evidence\": \"Genetic complementation in Chlamydomonas ift54 mutants with IFT43 immunofluorescence/immunoblot\",\n      \"pmids\": [\"28417161\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"IFT43 is the readout, not the manipulated subject\", \"Direct IFT43-IFT54 relationship not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linked IFT43 dysfunction to specific human ciliopathies, connecting its ciliogenesis role to skeletal and retinal disease.\",\n      \"evidence\": \"Exome sequencing, growth-plate histology and ciliogenesis assays in SRPS patient cells; mutant IFT43 expression and cilium-length assays in mIMCD3/MDCK cells for retinal degeneration\",\n      \"pmids\": [\"28400947\", \"28973684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the cilia-shortening phenotype not defined\", \"Tissue-specific requirements not dissected\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a direct cargo-handling role, showing IFT43 binds the EP4 GPCR and cooperates with Rab23 to traffic it into cilia.\",\n      \"evidence\": \"siRNA screen, reciprocal co-IP and domain mapping with EP4, and ciliary EP4 imaging in zebrafish and mammalian cells\",\n      \"pmids\": [\"41372612\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether IFT43-EP4 binding is direct or complex-mediated not fully resolved\", \"Mechanism of Rab23 cooperation unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established the in vivo requirement of IFT43 for development and Hedgehog signaling via control of ciliary Gli2/Gli3 dynamics and activator/repressor balance.\",\n      \"evidence\": \"Mouse Ift43 knockout with Gli2/Gli3/Smoothened ciliary imaging, SAG-induced Gli1 induction, and Gli2 cleavage assays (preprint)\",\n      \"pmids\": [\"41648367\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Direct IFT43-Gli interaction not shown\", \"How retrograde transport mechanistically governs Gli processing unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how IFT43, as the peripheral arm of IFT-A, mechanistically couples retrograde transport to selective GPCR cargo loading and to Gli processing.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of IFT43 within an assembled retrograde train\", \"Direct cargo-recognition mechanism for GPCRs beyond EP4 not defined\", \"Link between transport defect and Gli activator/repressor balance not mechanistically resolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 4, 7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [\"IFT-A complex\", \"IFT-A peripheral subcomplex (IFT43/IFT121/IFT139)\"],\n    \"partners\": [\"IFT121\", \"IFT139\", \"EP4\", \"Rab23\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}