{"gene":"IFT43","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2011,"finding":"IFT43 is a subunit of the IFT complex A (IFT-A) peripheral subcomplex involved in retrograde ciliary transport. A homozygous mutation in the IFT43 initiation codon (C14ORF179) disrupts translation, producing a shorter protein from a downstream ATG, and causes accumulation of IFT complex B proteins at the ciliary tip due to failed retrograde transport from the ciliary tip to its base, while anterograde transport remains functional.","method":"Western blot (mutation effect on translation), immunofluorescence of ciliated fibroblasts from Sensenbrenner syndrome patients showing IFT-B accumulation at ciliary tip","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (western blot, immunofluorescence) in patient-derived fibroblasts with clear mechanistic readout, corroborated by parallel findings in WDR35/IFT121 patient cells","pmids":["21378380"],"is_preprint":false},{"year":2011,"finding":"IFT43 directly interacts with IFT121 within the IFT-A complex. IFT43 associates with the full 16S IFT-A complex in both cell bodies and flagella, but a significant fraction of cell body IFT43 exists as a smaller ~2S species not associated with the IFT-A complex. A core subcomplex of IFT144/IFT140/IFT122 (12S) exists independently, placing IFT43 and IFT121 as peripheral/satellite components.","method":"Sucrose density gradient centrifugation, antibody pulldowns, yeast two-hybrid, heterologous recombinant protein co-expression in E. coli, analysis of ift121 and ift122 mutants (Chlamydomonas reinhardtii ortholog)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in E. coli, yeast two-hybrid, and genetic mutant analysis provide multiple orthogonal lines of evidence for direct IFT43-IFT121 interaction and IFT-A complex organization","pmids":["22170070"],"is_preprint":false},{"year":2016,"finding":"IFT43 is part of the peripheral IFT-A subcomplex (with IFT121/IFT139), distinct from the core subcomplex (IFT122/IFT140/IFT144) that associates with TULP3. The peripheral subcomplex, with IFT139 most distally located, is essential for retrograde trafficking of IFT-A, IFT-B, and G protein-coupled receptors (GPCRs) including Smoothened and GPR161 from the ciliary tip.","method":"Visible immunoprecipitation (VIP) assay to detect protein-protein interactions; IFT139-KO and IFT144-KO cell analysis by immunofluorescence showing distinct phenotypes in GPCR and IFT complex localization","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — novel VIP assay for protein interactions combined with defined KO cell phenotypes showing distinct roles of core vs peripheral subunits; mechanistically rigorous","pmids":["27932497"],"is_preprint":false},{"year":2014,"finding":"IFT43 moves bidirectionally within cilia at ~0.45 µm/s in both anterograde and retrograde directions in mouse renal epithelial (IMCD-3) cells, consistent with being transported by the IFT machinery. Live imaging of GFP-tagged IFT43 demonstrated these dynamics, and knockdown of ICK kinase increased anterograde IFT velocities while overexpression reduced retrograde speed, suggesting ICK regulates IFT dynamics through the mTORC1 pathway.","method":"Live imaging of fluorescently tagged IFT43 (GFP-IFT43) in IMCD-3 cells; ICK/MOK knockdown and overexpression experiments; rapamycin treatment","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — direct live imaging of IFT43 movement with functional perturbation, but single lab study","pmids":["25243405"],"is_preprint":false},{"year":2017,"finding":"IFT43 mutations cause short rib polydactyly syndrome (SRPS) by disrupting ciliogenesis and cartilage growth plate architecture, leading to altered endochondral ossification. IFT43 is essential for ciliogenesis, and its loss disrupts the orderly proliferation and differentiation of growth plate chondrocytes. The phenotypic similarity with IFT121 (WDR35) mutations confirms that IFT43 and its direct interactor IFT121 operate in the same pathway.","method":"Patient mutation analysis, histological analysis of growth plate architecture, ciliary immunofluorescence in patient-derived cells, genetic epistasis with IFT121 mutations","journal":"Cilia","confidence":"Medium","confidence_rationale":"Tier 2 — patient-derived cell imaging plus histological phenotype, epistasis with IFT121 confirms pathway position, single lab","pmids":["28400947"],"is_preprint":false},{"year":2017,"finding":"A homozygous missense mutation in IFT43 (c.100 G>A) causes non-syndromic recessive retinal degeneration. IFT43 localizes to the photoreceptors and to the tip of cilia in transfected mIMCD3 and MDCK cells. Expression of mutant IFT43 results in significantly shorter cilia compared to wild-type IFT43, demonstrating a role for IFT43 in maintaining normal cilia length.","method":"RT-PCR, western blot, immunohistochemistry in retina and transfected cell lines (mIMCD3, MDCK); cilia length measurement comparing wild-type vs mutant IFT43 expressing cells","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct subcellular localization combined with functional cilia length phenotype from mutant overexpression in two cell lines","pmids":["28973684"],"is_preprint":false},{"year":2013,"finding":"The small GTPase Rsg1 (a binding partner of the planar cell polarity effector Fuz) is required for appropriate cytoplasmic localization of the retrograde IFT-A protein IFT43 in Xenopus multiciliated cells. Loss of Rsg1 impairs axonemal IFT dynamics and disrupts apical trafficking of basal bodies.","method":"Loss-of-function (morpholino knockdown) in Xenopus multiciliated cells; live imaging of IFT dynamics; immunofluorescence for IFT43 cytoplasmic localization","journal":"Cilia","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization imaging with functional consequence in a well-established model system, single lab","pmids":["24192041"],"is_preprint":false},{"year":2017,"finding":"In Chlamydomonas, loss of IFT54 (IFT-B component) causes accumulation of IFT-A component IFT43 (along with IFT-B component IFT46) at the flagellar tip in cells expressing only the CC domain of IFT54, indicating that IFT54 functions in IFT turnaround at the flagellar tip and that IFT43 accumulation is a readout of failed retrograde transport initiation.","method":"Chlamydomonas ift54 mutant rescue experiments with domain-deletion constructs; immunofluorescence showing IFT43 accumulation at flagellar tip","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 — genetic rescue with domain mutants in Chlamydomonas ortholog system; IFT43 accumulation used as functional readout of retrograde transport failure","pmids":["28417161"],"is_preprint":false},{"year":2025,"finding":"IFT43 physically interacts with the GPCR prostaglandin E receptor 4 (EP4) through EP4's third intracellular (IC3) loop and C-terminal (CT) region. IFT43 functions as a crucial regulator of EP4 ciliary trafficking in zebrafish and mammalian cells. High-content siRNA screening identified IFT43 alongside Rab23 GTPase as regulators of EP4 entry into primary cilia.","method":"High-content siRNA screen; co-immunoprecipitation (physical interaction between EP4 and IFT43); CRISPR C-to-G base editing (CGBE1) of EP4 LPG ciliary localization motif; immunofluorescence in zebrafish embryos, mouse tissues, and human cells","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP demonstrates physical interaction, siRNA screen plus CRISPR editing provide functional validation, single recent study","pmids":["41372612"],"is_preprint":false},{"year":2016,"finding":"Haploinsufficiency of IFT43 (via a de novo 14q24.2q24.3 microdeletion) leads to increased accumulation of IFT-B proteins at the ciliary tip in patient-derived fibroblasts compared to controls, demonstrating defective retrograde ciliary transport even with loss of one allele.","method":"Immunocytochemistry in patient-derived fibroblasts showing IFT-B protein distribution; array CGH for deletion mapping; Sanger and exome sequencing of second allele","journal":"American journal of medical genetics. Part A","confidence":"Low","confidence_rationale":"Tier 3 — single immunofluorescence experiment in patient-derived cells, no complementation or rescue","pmids":["26892345"],"is_preprint":false},{"year":2020,"finding":"Under simulated microgravity (SMG), the ratio of anterograde (IFT88) to retrograde (IFT43) IFT particle numbers and protein expression increases in osteocytes, and anterograde IFT particle size decreases, indicating that SMG disrupts the balanced operating state of IFT and shifts the anterograde/retrograde balance, correlating with cilia shortening.","method":"Live imaging with GFP::IFT88 (anterograde) and OFP::IFT43 (retrograde) tagged proteins in osteocytes under simulated microgravity; particle counting and size measurement; western blot for protein expression","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 — IFT43-OFP used as retrograde transport marker; correlative rather than mechanistic for IFT43 itself","pmids":["32828281"],"is_preprint":false},{"year":2026,"finding":"Loss of Ift43 in mice causes mid-gestation lethality with severe craniofacial, neural tube, abdominal wall, and limb patterning defects. At the cellular level, Ift43 deficiency reduces cilia number and length, blocks Gli1 induction by Hedgehog pathway activation, causes abnormal accumulation of Gli2 and Gli3 at ciliary tips before stimulation, and fails to suppress Gli repressor forms after activation. Conversely, Ift43 overexpression increases basal Gli2 cleavage, revealing a role for Ift43 in regulating Gli processing and setting the balance between Gli activator and repressor forms downstream of Smoothened (which still relocalizes to cilia normally).","method":"Mouse Ift43 knockout (loss-of-function), immunofluorescence for Gli2/Gli3/Smoothened ciliary localization, Gli1 reporter induction by SAG agonist, Ift43 overexpression Gli2 cleavage assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal readouts (KO phenotype, GPCR localization, Gli processing gain- and loss-of-function) in mouse model; preprint not yet peer-reviewed","pmids":["41648367"],"is_preprint":true}],"current_model":"IFT43 is a peripheral subunit of the IFT-A complex (forming a subcomplex with IFT121/IFT139) that mediates retrograde ciliary transport—moving cargoes including GPCRs (Smoothened, GPR161, EP4) and Gli transcription factors from the ciliary tip to the base via physical interaction with IFT121 and cargo receptors—while also regulating Gli2/Gli3 processing to balance Hedgehog pathway activator and repressor output; loss of IFT43 disrupts ciliogenesis, causes IFT-B and Gli accumulation at ciliary tips, and results in skeletal ciliopathies (Sensenbrenner syndrome, SRPS) and retinal degeneration."},"narrative":{"teleology":[{"year":2011,"claim":"Establishing IFT43 as an IFT-A subunit required for retrograde ciliary transport resolved its molecular identity and linked it to a specific ciliary trafficking step: patient cells carrying a homozygous IFT43 initiation-codon mutation showed IFT-B accumulation at the ciliary tip with intact anterograde transport, defining IFT43 as a retrograde-specific factor and implicating it in Sensenbrenner syndrome.","evidence":"Western blot for truncated protein expression; immunofluorescence of IFT-B distribution in patient-derived Sensenbrenner syndrome fibroblasts","pmids":["21378380"],"confidence":"High","gaps":["No direct rescue/complementation experiment to confirm causality of the IFT43 mutation alone","Molecular mechanism by which IFT43 contributes to retrograde motor engagement unknown"]},{"year":2011,"claim":"Determining that IFT43 directly binds IFT121 and exists as both a free cytoplasmic pool and a complex-associated pool defined IFT43's position as a peripheral/satellite component of IFT-A rather than part of the stable core.","evidence":"Yeast two-hybrid, recombinant co-expression in E. coli, sucrose gradient sedimentation, and analysis of Chlamydomonas ift121/ift122 mutants","pmids":["22170070"],"confidence":"High","gaps":["Structural basis of IFT43–IFT121 interaction unresolved","Function of the free cytoplasmic IFT43 pool unknown"]},{"year":2013,"claim":"Showing that Rsg1 GTPase controls the cytoplasmic localization of IFT43 in multiciliated cells linked planar cell polarity effector pathways to retrograde IFT-A positioning, addressing how IFT43 reaches its site of action.","evidence":"Morpholino knockdown of Rsg1 in Xenopus multiciliated cells; immunofluorescence for IFT43 localization and live IFT imaging","pmids":["24192041"],"confidence":"Medium","gaps":["Whether Rsg1 acts directly on IFT43 or indirectly through IFT121/IFT139 not distinguished","Not validated in mammalian systems"]},{"year":2014,"claim":"Live imaging of GFP-IFT43 revealed its bidirectional transport at ~0.45 µm/s in mammalian cilia and demonstrated that ICK kinase modulates IFT velocities, establishing that IFT43 undergoes regulated active transport rather than passive diffusion.","evidence":"Live imaging of GFP-IFT43 in IMCD-3 cells; ICK knockdown/overexpression and rapamycin treatment","pmids":["25243405"],"confidence":"Medium","gaps":["Whether ICK acts directly on IFT43 or on the motor machinery not resolved","Single cell line used"]},{"year":2016,"claim":"Mapping the IFT-A peripheral subcomplex (IFT43/IFT121/IFT139) as functionally distinct from the core (IFT122/IFT140/IFT144) showed that the peripheral subcomplex is specifically required for retrograde trafficking of GPCRs (Smoothened, GPR161) and IFT particles, whereas the core mediates TULP3-dependent cargo import.","evidence":"VIP assay for subcomplex interactions; IFT139-KO and IFT144-KO cell immunofluorescence phenotype comparison","pmids":["27932497"],"confidence":"High","gaps":["Direct contribution of IFT43 versus IFT139 versus IFT121 within the peripheral subcomplex not individually dissected","No structural resolution of the peripheral subcomplex"]},{"year":2017,"claim":"Demonstrating that IFT43 mutations cause SRPS with disrupted growth plate architecture and that IFT43 localizes to photoreceptors where its mutation causes retinal degeneration expanded the disease spectrum beyond Sensenbrenner syndrome and confirmed IFT43's essential role in ciliogenesis across tissue contexts.","evidence":"Patient mutation analysis, growth plate histology, and cilia length quantification in cells expressing mutant versus wild-type IFT43","pmids":["28400947","28973684"],"confidence":"Medium","gaps":["Rescue experiments not performed for the retinal degeneration allele","Tissue-specific functions of IFT43 versus general ciliogenesis defect not distinguished"]},{"year":2025,"claim":"Identifying EP4 as a direct physical interactor of IFT43 through its IC3 loop and C-terminal region demonstrated that IFT43 functions not only as a general retrograde transport component but also as a cargo-specific adaptor for GPCR ciliary trafficking.","evidence":"Co-immunoprecipitation of EP4–IFT43 complex; high-content siRNA screen; CRISPR base editing of EP4 ciliary localization motif in zebrafish and mammalian cells","pmids":["41372612"],"confidence":"Medium","gaps":["Whether IFT43 mediates EP4 import, export, or both not fully resolved","Reciprocal IP or in vitro reconstitution of direct binding not shown","Stoichiometry and competition with other GPCR cargoes unknown"]},{"year":null,"claim":"The mechanism by which IFT43 regulates Gli2/Gli3 processing and sets the activator/repressor balance downstream of Smoothened remains incompletely defined, as does the structural basis for IFT43's interactions within the peripheral subcomplex and with GPCR cargoes.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of IFT43 or the IFT43/IFT121 interface","Mechanism coupling IFT43 to Gli processing machinery unknown","Whether IFT43's free cytoplasmic pool has a cilium-independent function is untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,8]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,3,5,7]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,6]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,2,8]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,8,11]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,4,5]}],"complexes":["IFT-A complex","IFT-A peripheral subcomplex (IFT43/IFT121/IFT139)"],"partners":["WDR35","IFT139","EP4","RSG1"],"other_free_text":[]},"mechanistic_narrative":"IFT43 is a peripheral subunit of the intraflagellar transport complex A (IFT-A) that mediates retrograde ciliary transport, the movement of protein cargoes from the ciliary tip back to the cell body. Within IFT-A, IFT43 directly binds IFT121 and forms a peripheral subcomplex with IFT121 and IFT139 that is distinct from the IFT122/IFT140/IFT144 core; this peripheral subcomplex is essential for retrograde trafficking of IFT-B particles and G protein-coupled receptors including Smoothened, GPR161, and EP4, and for regulating Gli2/Gli3 processing that balances Hedgehog pathway activator and repressor output [PMID:22170070, PMID:27932497, PMID:41372612, PMID:41648367]. Loss-of-function mutations in IFT43 cause IFT-B accumulation at ciliary tips, shortened cilia, and defective ciliogenesis, and are causative for Sensenbrenner syndrome (cranioectodermal dysplasia), short-rib polydactyly syndrome, and non-syndromic retinal degeneration [PMID:21378380, PMID:28400947, PMID:28973684]. IFT43 moves bidirectionally within cilia and its cytoplasmic localization depends on the small GTPase Rsg1, linking planar cell polarity signaling to IFT-A positioning [PMID:25243405, PMID:24192041]."},"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 IFT43 initiation codon (C14ORF179) disrupts translation, producing a shorter protein from a downstream ATG, and causes accumulation of IFT complex B proteins at the ciliary tip due to failed retrograde transport from the ciliary tip to its base, while anterograde transport remains functional.\",\n      \"method\": \"Western blot (mutation effect on translation), immunofluorescence of ciliated fibroblasts from Sensenbrenner syndrome patients showing IFT-B accumulation at ciliary tip\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (western blot, immunofluorescence) in patient-derived fibroblasts with clear mechanistic readout, corroborated by parallel findings in WDR35/IFT121 patient cells\",\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 associates with the full 16S IFT-A complex in both cell bodies and flagella, but a significant fraction of cell body IFT43 exists as a smaller ~2S species not associated with the IFT-A complex. A core subcomplex of IFT144/IFT140/IFT122 (12S) exists independently, placing IFT43 and IFT121 as peripheral/satellite components.\",\n      \"method\": \"Sucrose density gradient centrifugation, antibody pulldowns, yeast two-hybrid, heterologous recombinant protein co-expression in E. coli, analysis of ift121 and ift122 mutants (Chlamydomonas reinhardtii ortholog)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in E. coli, yeast two-hybrid, and genetic mutant analysis provide multiple orthogonal lines of evidence for direct IFT43-IFT121 interaction and IFT-A complex organization\",\n      \"pmids\": [\"22170070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"IFT43 is part of the peripheral IFT-A subcomplex (with IFT121/IFT139), distinct from the core subcomplex (IFT122/IFT140/IFT144) that associates with TULP3. The peripheral subcomplex, with IFT139 most distally located, is essential for retrograde trafficking of IFT-A, IFT-B, and G protein-coupled receptors (GPCRs) including Smoothened and GPR161 from the ciliary tip.\",\n      \"method\": \"Visible immunoprecipitation (VIP) assay to detect protein-protein interactions; IFT139-KO and IFT144-KO cell analysis by immunofluorescence showing distinct phenotypes in GPCR and IFT complex localization\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — novel VIP assay for protein interactions combined with defined KO cell phenotypes showing distinct roles of core vs peripheral subunits; mechanistically rigorous\",\n      \"pmids\": [\"27932497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"IFT43 moves bidirectionally within cilia at ~0.45 µm/s in both anterograde and retrograde directions in mouse renal epithelial (IMCD-3) cells, consistent with being transported by the IFT machinery. Live imaging of GFP-tagged IFT43 demonstrated these dynamics, and knockdown of ICK kinase increased anterograde IFT velocities while overexpression reduced retrograde speed, suggesting ICK regulates IFT dynamics through the mTORC1 pathway.\",\n      \"method\": \"Live imaging of fluorescently tagged IFT43 (GFP-IFT43) in IMCD-3 cells; ICK/MOK knockdown and overexpression experiments; rapamycin treatment\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct live imaging of IFT43 movement with functional perturbation, but single lab study\",\n      \"pmids\": [\"25243405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"IFT43 mutations cause short rib polydactyly syndrome (SRPS) by disrupting ciliogenesis and cartilage growth plate architecture, leading to altered endochondral ossification. IFT43 is essential for ciliogenesis, and its loss disrupts the orderly proliferation and differentiation of growth plate chondrocytes. The phenotypic similarity with IFT121 (WDR35) mutations confirms that IFT43 and its direct interactor IFT121 operate in the same pathway.\",\n      \"method\": \"Patient mutation analysis, histological analysis of growth plate architecture, ciliary immunofluorescence in patient-derived cells, genetic epistasis with IFT121 mutations\",\n      \"journal\": \"Cilia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — patient-derived cell imaging plus histological phenotype, epistasis with IFT121 confirms pathway position, single lab\",\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 non-syndromic recessive retinal degeneration. IFT43 localizes to the photoreceptors and to the tip of cilia in transfected mIMCD3 and MDCK cells. Expression of mutant IFT43 results in significantly shorter cilia compared to wild-type IFT43, demonstrating a role for IFT43 in maintaining normal cilia length.\",\n      \"method\": \"RT-PCR, western blot, immunohistochemistry in retina and transfected cell lines (mIMCD3, MDCK); cilia length measurement comparing wild-type vs mutant IFT43 expressing cells\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct subcellular localization combined with functional cilia length phenotype from mutant overexpression in two cell lines\",\n      \"pmids\": [\"28973684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The small GTPase Rsg1 (a binding partner of the planar cell polarity effector Fuz) is required for appropriate cytoplasmic localization of the retrograde IFT-A protein IFT43 in Xenopus multiciliated cells. Loss of Rsg1 impairs axonemal IFT dynamics and disrupts apical trafficking of basal bodies.\",\n      \"method\": \"Loss-of-function (morpholino knockdown) in Xenopus multiciliated cells; live imaging of IFT dynamics; immunofluorescence for IFT43 cytoplasmic localization\",\n      \"journal\": \"Cilia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization imaging with functional consequence in a well-established model system, single lab\",\n      \"pmids\": [\"24192041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Chlamydomonas, loss of IFT54 (IFT-B component) causes accumulation of IFT-A component IFT43 (along with IFT-B component IFT46) at the flagellar tip in cells expressing only the CC domain of IFT54, indicating that IFT54 functions in IFT turnaround at the flagellar tip and that IFT43 accumulation is a readout of failed retrograde transport initiation.\",\n      \"method\": \"Chlamydomonas ift54 mutant rescue experiments with domain-deletion constructs; immunofluorescence showing IFT43 accumulation at flagellar tip\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic rescue with domain mutants in Chlamydomonas ortholog system; IFT43 accumulation used as functional readout of retrograde transport failure\",\n      \"pmids\": [\"28417161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IFT43 physically interacts with the GPCR prostaglandin E receptor 4 (EP4) through EP4's third intracellular (IC3) loop and C-terminal (CT) region. IFT43 functions as a crucial regulator of EP4 ciliary trafficking in zebrafish and mammalian cells. High-content siRNA screening identified IFT43 alongside Rab23 GTPase as regulators of EP4 entry into primary cilia.\",\n      \"method\": \"High-content siRNA screen; co-immunoprecipitation (physical interaction between EP4 and IFT43); CRISPR C-to-G base editing (CGBE1) of EP4 LPG ciliary localization motif; immunofluorescence in zebrafish embryos, mouse tissues, and human cells\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP demonstrates physical interaction, siRNA screen plus CRISPR editing provide functional validation, single recent study\",\n      \"pmids\": [\"41372612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Haploinsufficiency of IFT43 (via a de novo 14q24.2q24.3 microdeletion) leads to increased accumulation of IFT-B proteins at the ciliary tip in patient-derived fibroblasts compared to controls, demonstrating defective retrograde ciliary transport even with loss of one allele.\",\n      \"method\": \"Immunocytochemistry in patient-derived fibroblasts showing IFT-B protein distribution; array CGH for deletion mapping; Sanger and exome sequencing of second allele\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single immunofluorescence experiment in patient-derived cells, no complementation or rescue\",\n      \"pmids\": [\"26892345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Under simulated microgravity (SMG), the ratio of anterograde (IFT88) to retrograde (IFT43) IFT particle numbers and protein expression increases in osteocytes, and anterograde IFT particle size decreases, indicating that SMG disrupts the balanced operating state of IFT and shifts the anterograde/retrograde balance, correlating with cilia shortening.\",\n      \"method\": \"Live imaging with GFP::IFT88 (anterograde) and OFP::IFT43 (retrograde) tagged proteins in osteocytes under simulated microgravity; particle counting and size measurement; western blot for protein expression\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — IFT43-OFP used as retrograde transport marker; correlative rather than mechanistic for IFT43 itself\",\n      \"pmids\": [\"32828281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Loss of Ift43 in mice causes mid-gestation lethality with severe craniofacial, neural tube, abdominal wall, and limb patterning defects. At the cellular level, Ift43 deficiency reduces cilia number and length, blocks Gli1 induction by Hedgehog pathway activation, causes abnormal accumulation of Gli2 and Gli3 at ciliary tips before stimulation, and fails to suppress Gli repressor forms after activation. Conversely, Ift43 overexpression increases basal Gli2 cleavage, revealing a role for Ift43 in regulating Gli processing and setting the balance between Gli activator and repressor forms downstream of Smoothened (which still relocalizes to cilia normally).\",\n      \"method\": \"Mouse Ift43 knockout (loss-of-function), immunofluorescence for Gli2/Gli3/Smoothened ciliary localization, Gli1 reporter induction by SAG agonist, Ift43 overexpression Gli2 cleavage assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal readouts (KO phenotype, GPCR localization, Gli processing gain- and loss-of-function) in mouse model; preprint not yet peer-reviewed\",\n      \"pmids\": [\"41648367\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"IFT43 is a peripheral subunit of the IFT-A complex (forming a subcomplex with IFT121/IFT139) that mediates retrograde ciliary transport—moving cargoes including GPCRs (Smoothened, GPR161, EP4) and Gli transcription factors from the ciliary tip to the base via physical interaction with IFT121 and cargo receptors—while also regulating Gli2/Gli3 processing to balance Hedgehog pathway activator and repressor output; loss of IFT43 disrupts ciliogenesis, causes IFT-B and Gli accumulation at ciliary tips, and results in skeletal ciliopathies (Sensenbrenner syndrome, SRPS) and retinal degeneration.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"IFT43 is a peripheral subunit of the intraflagellar transport complex A (IFT-A) that mediates retrograde ciliary transport, the movement of protein cargoes from the ciliary tip back to the cell body. Within IFT-A, IFT43 directly binds IFT121 and forms a peripheral subcomplex with IFT121 and IFT139 that is distinct from the IFT122/IFT140/IFT144 core; this peripheral subcomplex is essential for retrograde trafficking of IFT-B particles and G protein-coupled receptors including Smoothened, GPR161, and EP4, and for regulating Gli2/Gli3 processing that balances Hedgehog pathway activator and repressor output [PMID:22170070, PMID:27932497, PMID:41372612, PMID:41648367]. Loss-of-function mutations in IFT43 cause IFT-B accumulation at ciliary tips, shortened cilia, and defective ciliogenesis, and are causative for Sensenbrenner syndrome (cranioectodermal dysplasia), short-rib polydactyly syndrome, and non-syndromic retinal degeneration [PMID:21378380, PMID:28400947, PMID:28973684]. IFT43 moves bidirectionally within cilia and its cytoplasmic localization depends on the small GTPase Rsg1, linking planar cell polarity signaling to IFT-A positioning [PMID:25243405, PMID:24192041].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Establishing IFT43 as an IFT-A subunit required for retrograde ciliary transport resolved its molecular identity and linked it to a specific ciliary trafficking step: patient cells carrying a homozygous IFT43 initiation-codon mutation showed IFT-B accumulation at the ciliary tip with intact anterograde transport, defining IFT43 as a retrograde-specific factor and implicating it in Sensenbrenner syndrome.\",\n      \"evidence\": \"Western blot for truncated protein expression; immunofluorescence of IFT-B distribution in patient-derived Sensenbrenner syndrome fibroblasts\",\n      \"pmids\": [\"21378380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No direct rescue/complementation experiment to confirm causality of the IFT43 mutation alone\", \"Molecular mechanism by which IFT43 contributes to retrograde motor engagement unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Determining that IFT43 directly binds IFT121 and exists as both a free cytoplasmic pool and a complex-associated pool defined IFT43's position as a peripheral/satellite component of IFT-A rather than part of the stable core.\",\n      \"evidence\": \"Yeast two-hybrid, recombinant co-expression in E. coli, sucrose gradient sedimentation, and analysis of Chlamydomonas ift121/ift122 mutants\",\n      \"pmids\": [\"22170070\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of IFT43–IFT121 interaction unresolved\", \"Function of the free cytoplasmic IFT43 pool unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showing that Rsg1 GTPase controls the cytoplasmic localization of IFT43 in multiciliated cells linked planar cell polarity effector pathways to retrograde IFT-A positioning, addressing how IFT43 reaches its site of action.\",\n      \"evidence\": \"Morpholino knockdown of Rsg1 in Xenopus multiciliated cells; immunofluorescence for IFT43 localization and live IFT imaging\",\n      \"pmids\": [\"24192041\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Rsg1 acts directly on IFT43 or indirectly through IFT121/IFT139 not distinguished\", \"Not validated in mammalian systems\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Live imaging of GFP-IFT43 revealed its bidirectional transport at ~0.45 µm/s in mammalian cilia and demonstrated that ICK kinase modulates IFT velocities, establishing that IFT43 undergoes regulated active transport rather than passive diffusion.\",\n      \"evidence\": \"Live imaging of GFP-IFT43 in IMCD-3 cells; ICK knockdown/overexpression and rapamycin treatment\",\n      \"pmids\": [\"25243405\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ICK acts directly on IFT43 or on the motor machinery not resolved\", \"Single cell line used\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mapping the IFT-A peripheral subcomplex (IFT43/IFT121/IFT139) as functionally distinct from the core (IFT122/IFT140/IFT144) showed that the peripheral subcomplex is specifically required for retrograde trafficking of GPCRs (Smoothened, GPR161) and IFT particles, whereas the core mediates TULP3-dependent cargo import.\",\n      \"evidence\": \"VIP assay for subcomplex interactions; IFT139-KO and IFT144-KO cell immunofluorescence phenotype comparison\",\n      \"pmids\": [\"27932497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct contribution of IFT43 versus IFT139 versus IFT121 within the peripheral subcomplex not individually dissected\", \"No structural resolution of the peripheral subcomplex\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that IFT43 mutations cause SRPS with disrupted growth plate architecture and that IFT43 localizes to photoreceptors where its mutation causes retinal degeneration expanded the disease spectrum beyond Sensenbrenner syndrome and confirmed IFT43's essential role in ciliogenesis across tissue contexts.\",\n      \"evidence\": \"Patient mutation analysis, growth plate histology, and cilia length quantification in cells expressing mutant versus wild-type IFT43\",\n      \"pmids\": [\"28400947\", \"28973684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Rescue experiments not performed for the retinal degeneration allele\", \"Tissue-specific functions of IFT43 versus general ciliogenesis defect not distinguished\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identifying EP4 as a direct physical interactor of IFT43 through its IC3 loop and C-terminal region demonstrated that IFT43 functions not only as a general retrograde transport component but also as a cargo-specific adaptor for GPCR ciliary trafficking.\",\n      \"evidence\": \"Co-immunoprecipitation of EP4–IFT43 complex; high-content siRNA screen; CRISPR base editing of EP4 ciliary localization motif in zebrafish and mammalian cells\",\n      \"pmids\": [\"41372612\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether IFT43 mediates EP4 import, export, or both not fully resolved\", \"Reciprocal IP or in vitro reconstitution of direct binding not shown\", \"Stoichiometry and competition with other GPCR cargoes unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The mechanism by which IFT43 regulates Gli2/Gli3 processing and sets the activator/repressor balance downstream of Smoothened remains incompletely defined, as does the structural basis for IFT43's interactions within the peripheral subcomplex and with GPCR cargoes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of IFT43 or the IFT43/IFT121 interface\", \"Mechanism coupling IFT43 to Gli processing machinery unknown\", \"Whether IFT43's free cytoplasmic pool has a cilium-independent function is untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 3, 5, 7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 2, 8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 8, 11]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 4, 5]}\n    ],\n    \"complexes\": [\n      \"IFT-A complex\",\n      \"IFT-A peripheral subcomplex (IFT43/IFT121/IFT139)\"\n    ],\n    \"partners\": [\n      \"WDR35\",\n      \"IFT139\",\n      \"EP4\",\n      \"RSG1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}