{"gene":"FARP2","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2005,"finding":"FARP2 (a FERM domain-containing RhoGEF) directly associates with plexin-A1 in the presence of neuropilin-1. Upon Sema3A binding to neuropilin-1, FARP2 dissociates from plexin-A1, leading to activation of FARP2's Rac GEF activity, Rnd1 recruitment to plexin-A1, and downregulation of R-Ras. Simultaneously, the FERM domain of FARP2 sequesters PIPKIγ661 from talin, inhibiting its kinase activity. These activities are required for Sema3A-mediated axonal repulsion and suppression of neuronal adhesion.","method":"Co-immunoprecipitation, pulldown assays, GEF activity assays, dominant-negative/overexpression studies in neuronal growth cone collapse and adhesion assays","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, biochemical GEF assay, multiple orthogonal functional readouts, strong citation record","pmids":["16286926"],"is_preprint":false},{"year":2010,"finding":"FARP2 is required for localized activation of GTP-bound Rac1 into podosome-ring-like structures in osteoclasts, and is relevant to integrin β3 activity during osteoclastogenesis. FARP2 deficiency results in reduced formation of multinucleated osteoclasts and resorption pits compared to wild-type controls.","method":"Live cell imaging, biochemical GEF/Rac1-GTP pulldown assays, siRNA knockdown, integrin activity assays, osteoclast differentiation and bone resorption pit assays","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (live imaging, biochemical assays, KD phenotype), clear mechanistic readouts","pmids":["20702777"],"is_preprint":false},{"year":2013,"finding":"Crystal structures of the catalytic DH domain and the DH-PH-PH domains of FARP2 reveal an autoinhibited conformation in which the GEF substrate-binding site is blocked collectively by the last helix of the DH domain and the two PH domains, stabilized by multiple inter-domain interactions and two structured inter-domain linkers. Cell-based activity assays confirmed suppression of FARP2 GEF activity by these autoinhibitory elements.","method":"X-ray crystallography, cell-based GEF activity assays, domain mutagenesis","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional validation by cell-based assays","pmids":["23375260"],"is_preprint":false},{"year":2019,"finding":"FARP2 is a substrate and binding partner of aPKCι. Binding is mediated by a FERM/FA domain–kinase domain interaction ('RIPR' motif-dependent), and aPKCι-dependent phosphorylation promotes detachment of FARP2 from aPKCι. FARP2 promotes GTP loading of Cdc42 and is required for efficient epithelial polarisation and tight junction formation. aPKCι acts in a positive feedback loop to drive localised FARP2 GEF activity.","method":"Co-immunoprecipitation, phosphorylation assays, Cdc42-GTP pulldown, siRNA knockdown with polarity/junction formation readouts, domain interaction mapping","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, biochemical GEF assay, KD phenotype with multiple cellular readouts","pmids":["30872454"],"is_preprint":false},{"year":2020,"finding":"The KRK motif in the PlxnA4 cytoplasmic domain, which binds FARP2, is required for Sema3A-mediated cortical neuron dendritic elaboration but dispensable for inhibitory axon guidance. FARP2 shows identical functional specificity to the KRK motif. Sema3A activates the small GTPase Rac1 downstream of PlxnA4/FARP2, and Rac1 activity is required for dendrite elaboration but not axon growth cone collapse. This defines a novel modular Sema3A–Nrp1/PlxnA4–FARP2–Rac1 pathway controlling dendritic morphogenesis.","method":"CRISPR/Cas9 knock-in mice (PlxnA4 KRK motif mutation), FARP2 knockout, Rac1 activity assays, cortical neuron morphology analysis (dendrite arborization and axon guidance assays)","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic epistasis with CRISPR knock-in, multiple orthogonal functional readouts, replicates and extends earlier mechanistic findings","pmids":["32499377"],"is_preprint":false},{"year":2009,"finding":"FARP2 is located in the 2q37.3 chromosomal region deleted in a patient with autism and 2q37 deletion syndrome. Expression analysis of lymphoblastoid cell lines demonstrated that FARP2 is considerably downregulated in the patient compared to family members, suggesting haploinsufficiency of FARP2 may contribute to neuropsychiatric and skeletal phenotypes.","method":"Array CGH, FISH, quantitative gene expression analysis in lymphoblastoid cell lines","journal":"American journal of medical genetics. Part A","confidence":"Low","confidence_rationale":"Tier 3 — expression analysis in patient cells, no direct mechanistic experiment on FARP2 protein function","pmids":["19365831"],"is_preprint":false},{"year":2008,"finding":"Bioinformatics and haplotype analysis narrowed a HDL-cholesterol QTL (Hdlq14) on mouse chromosome 1 to two candidate genes, Farp2 and Stk25. Sequencing revealed an amino acid polymorphism in a pleckstrin homology domain of Farp2 across inbred strains that associates with differences in HDL levels.","method":"QTL confirmation by intercross, combined cross data, haplotype analysis, sequencing of Farp2 coding sequence, expression analysis","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Low","confidence_rationale":"Tier 4 — genetic/bioinformatic association only, no direct mechanistic experiment on FARP2 protein","pmids":["18988887"],"is_preprint":false},{"year":2020,"finding":"Systematic RhoGEF/RhoGAP family-wide characterization identified FARP2 as a widely autoinhibited RhoGEF, confirming autoinhibition as a general mechanism enabling local regulation of Rho signalling; FARP2 localization and substrate specificity were catalogued in the context of integrin adhesion-regulated RAC1 signalling.","method":"Interactome mapping (AP-MS), localization screens, substrate specificity assays across RhoGEF family","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — systematic family-wide biochemical characterization, but FARP2-specific findings are part of a broader screen","pmids":["32203420"],"is_preprint":false}],"current_model":"FARP2 is a FERM domain-containing Dbl-family RhoGEF that is maintained in an autoinhibited conformation (DH domain blocked by the last DH helix and two PH domains) and is activated downstream of plexin-A1/neuropilin-1 upon Sema3A stimulation to promote Rac1 (and Cdc42) activation; in neurons it controls both axonal repulsion and dendritic morphogenesis via a PlxnA4-KRK-motif/FARP2/Rac1 module, in osteoclasts it drives podosome rearrangement and bone resorption through localised Rac1 activation and integrin β3 regulation, and in epithelial cells it participates in a positive-feedback loop with aPKCι to drive Cdc42-dependent polarity and tight junction formation."},"narrative":{"teleology":[{"year":2005,"claim":"The central question of how Sema3A receptor signalling engages a GEF was answered by showing that FARP2 directly binds plexin-A1/neuropilin-1 and, upon Sema3A stimulation, dissociates to activate Rac, recruit Rnd1 to plexin, and suppress R-Ras—establishing FARP2 as the signal-coupling GEF for axonal repulsion.","evidence":"Co-IP, pulldown, GEF activity assays, and functional growth-cone collapse/adhesion assays in neurons","pmids":["16286926"],"confidence":"High","gaps":["Structural basis for FARP2–plexin-A1 interaction and the release mechanism not determined","Whether FARP2 GEF activity toward Cdc42 versus Rac1 is context-dependent was not resolved","FARP2 FERM-domain sequestration of PIPKIγ661 not confirmed in vivo"]},{"year":2010,"claim":"Extending FARP2 function beyond neurons, its requirement for localized Rac1-GTP accumulation in osteoclast podosome rings and for integrin β3-dependent bone resorption established a general role in adhesion-coupled cytoskeletal remodelling.","evidence":"Live imaging, Rac1-GTP pulldowns, siRNA knockdown, and osteoclast differentiation/resorption pit assays","pmids":["20702777"],"confidence":"High","gaps":["Upstream signal activating FARP2 GEF release in osteoclasts not identified","Whether the autoinhibitory mechanism is identical to that in the plexin pathway was unknown"]},{"year":2013,"claim":"The structural basis of FARP2 autoinhibition was resolved: crystal structures revealed that the last DH helix and tandem PH domains cooperatively occlude the GTPase-binding surface, explaining how the enzyme stays silent until activated by upstream signals.","evidence":"X-ray crystallography of DH and DH-PH-PH domains with cell-based GEF assays and domain mutagenesis","pmids":["23375260"],"confidence":"High","gaps":["No structure of full-length FARP2 including the FERM domain","Mechanism by which upstream signals relieve autoinhibition (conformational change versus post-translational modification) not visualised"]},{"year":2019,"claim":"Discovery that aPKCι directly binds and phosphorylates FARP2 to promote its detachment and Cdc42-directed GEF activity revealed a second activation pathway operating in epithelial polarity and tight junction formation, independent of plexin signalling.","evidence":"Co-IP, phosphorylation assays, Cdc42-GTP pulldowns, siRNA knockdown with polarity and junction readouts, domain interaction mapping","pmids":["30872454"],"confidence":"High","gaps":["Identity of the phosphorylation site(s) and whether they directly relieve the DH-PH-PH autoinhibition not resolved","Whether aPKCι-FARP2 loop operates in non-epithelial contexts is unknown"]},{"year":2020,"claim":"Genetic epistasis in mice showed that the PlxnA4-KRK motif/FARP2/Rac1 module selectively controls dendritic elaboration but not axon guidance, demonstrating that FARP2 segregates distinct morphogenetic outputs of Sema3A signalling through the same receptor.","evidence":"CRISPR knock-in PlxnA4 mutant mice, FARP2 knockout mice, Rac1 activity assays, cortical neuron morphology analysis","pmids":["32499377"],"confidence":"High","gaps":["Molecular basis of how the KRK motif selectively recruits FARP2 versus other effectors not determined","Whether FARP2 contributes to dendrite morphogenesis in non-cortical neuron types is untested"]},{"year":2020,"claim":"Family-wide systematic characterisation confirmed FARP2 autoinhibition as representative of a general RhoGEF regulatory principle and placed FARP2 within integrin adhesion-regulated Rac1 signalling networks.","evidence":"AP-MS interactome mapping, localization screens, substrate specificity assays across the RhoGEF family","pmids":["32203420"],"confidence":"Medium","gaps":["FARP2-specific interactors identified in the screen were not individually validated","Quantitative parameters of FARP2 catalytic efficiency versus other RhoGEFs not compared"]},{"year":null,"claim":"The mechanism by which upstream signals (plexin dissociation, aPKCι phosphorylation) relieve the structurally characterised DH-PH-PH autoinhibition remains unresolved, and a full-length structure incorporating the FERM domain is lacking.","evidence":"","pmids":[],"confidence":"High","gaps":["No full-length structure of FARP2","Activation mechanism connecting signal reception to relief of DH-PH-PH autoinhibition not visualised","In vivo genetic models for non-neuronal FARP2 functions (epithelial polarity, osteoclast biology) are limited"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,3,4,7]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,3]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,4,7]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[3]}],"complexes":[],"partners":["PLXNA1","PLXNA4","NRP1","PRKCL","RAC1","CDC42","ITGB3"],"other_free_text":[]},"mechanistic_narrative":"FARP2 is an autoinhibited, FERM domain-containing Dbl-family RhoGEF that couples extracellular semaphorin and integrin signals to localized Rac1 and Cdc42 activation, thereby controlling cytoskeletal remodelling in neurons, osteoclasts, and epithelial cells. Crystal structures show that its GEF activity is suppressed by an intramolecular mechanism in which the last DH helix and two tandem PH domains occlude the substrate-binding site, and release of this autoinhibition is triggered by signal-dependent dissociation from plexin-A receptors or phosphorylation by aPKCι [PMID:23375260, PMID:16286926, PMID:30872454]. In the nervous system, FARP2 operates downstream of Sema3A–Nrp1/PlxnA signalling: it dissociates from plexin-A1 upon ligand binding to activate Rac1 for growth-cone collapse, and a PlxnA4-KRK-motif/FARP2/Rac1 module selectively drives cortical dendritic elaboration [PMID:16286926, PMID:32499377]. In osteoclasts, FARP2 directs Rac1-GTP into podosome-ring structures to regulate integrin β3 activity, multinucleated osteoclast formation, and bone resorption, while in epithelial cells it participates in an aPKCι-dependent positive-feedback loop activating Cdc42 to establish apical-basal polarity and tight junctions [PMID:20702777, PMID:30872454]."},"prefetch_data":{"uniprot":{"accession":"O94887","full_name":"FERM, ARHGEF and pleckstrin domain-containing protein 2","aliases":["FERM domain-including RhoGEF","FIR","FERM, RhoGEF and pleckstrin domain-containing protein 2","Pleckstrin homology domain-containing family C member 3","PH domain-containing family C member 3"],"length_aa":1054,"mass_kda":119.9,"function":"Functions as a guanine nucleotide exchange factor that activates RAC1. May have relatively low activity. Plays a role in the response to class 3 semaphorins and remodeling of the actin cytoskeleton. Plays a role in TNFSF11-mediated osteoclast differentiation, especially in podosome rearrangement and reorganization of the actin cytoskeleton. Regulates the activation of ITGB3, integrin signaling and cell adhesion (By similarity)","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/O94887/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FARP2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CLNS1A","stoichiometry":0.2},{"gene":"PSPC1","stoichiometry":0.2},{"gene":"SRP9","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/FARP2","total_profiled":1310},"omim":[{"mim_id":"617586","title":"FERM, ARHGEF, AND PLECKSTRIN DOMAINS-CONTAINING PROTEIN 2; FARP2","url":"https://www.omim.org/entry/617586"},{"mim_id":"300628","title":"FERM DOMAIN-CONTAINING PROTEIN 7; FRMD7","url":"https://www.omim.org/entry/300628"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/FARP2"},"hgnc":{"alias_symbol":["KIAA0793","FIR","PLEKHC3","FRG"],"prev_symbol":[]},"alphafold":{"accession":"O94887","domains":[{"cath_id":"3.10.20.90","chopping":"45-122","consensus_level":"medium","plddt":88.3094,"start":45,"end":122},{"cath_id":"2.30.29.30","chopping":"233-328_341-347","consensus_level":"medium","plddt":86.479,"start":233,"end":347},{"cath_id":"1.20.900.10","chopping":"536-741","consensus_level":"high","plddt":93.4779,"start":536,"end":741},{"cath_id":"2.30.29.30","chopping":"752-857","consensus_level":"high","plddt":89.3089,"start":752,"end":857},{"cath_id":"2.30.29.30","chopping":"932-1026","consensus_level":"high","plddt":92.5536,"start":932,"end":1026}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O94887","model_url":"https://alphafold.ebi.ac.uk/files/AF-O94887-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O94887-F1-predicted_aligned_error_v6.png","plddt_mean":74.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FARP2","jax_strain_url":"https://www.jax.org/strain/search?query=FARP2"},"sequence":{"accession":"O94887","fasta_url":"https://rest.uniprot.org/uniprotkb/O94887.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O94887/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O94887"}},"corpus_meta":[{"pmid":"16286926","id":"PMC_16286926","title":"FARP2 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Sema3A binding to neuropilin-1 induces dissociation of FARP2 from plexin-A1, resulting in activation of FARP2's Rac GEF activity, Rnd1 recruitment to plexin-A1, and downregulation of R-Ras, thereby triggering downstream signals for Sema3A-mediated axonal repulsion.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, GEF activity assays, dominant-negative and overexpression approaches in neuronal cells\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, biochemical GEF assays, and functional axon repulsion readout; highly cited foundational paper with multiple orthogonal methods\",\n      \"pmids\": [\"16286926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The FERM domain of FARP2 sequesters phosphatidylinositol phosphate kinase type I isoform PIPKIγ661 from talin, thereby inhibiting its kinase activity and suppressing neuronal adhesion downstream of Sema3A.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, pulldown with FERM domain\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase inhibition assay plus Co-IP with domain mapping; part of same rigorous multi-method study\",\n      \"pmids\": [\"16286926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FARP2 is required for localized activation of GTP-bound Rac1 into podosome-ring-like structures in osteoclasts; FARP2 deficiency reduces multinucleated osteoclast formation, podosome rearrangement, and bone resorption pit formation, and FARP2 is relevant to integrin β3 activity during osteoclastogenesis.\",\n      \"method\": \"Live cell imaging, biochemical GTP-Rac1 pulldown assays, FARP2 knockout/knockdown with phenotypic readouts (osteoclast formation, resorption pits, integrin β3 activity)\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotypes plus biochemical Rac1 activation assay; multiple orthogonal methods in one study\",\n      \"pmids\": [\"20702777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structures of the FARP2 catalytic DH domain and DH-PH-PH domains reveal an autoinhibited conformation in which the GEF substrate-binding site is blocked collectively by the last helix of the DH domain and the two PH domains; cell-based activity assays confirm suppression of GEF activity by these autoinhibitory elements.\",\n      \"method\": \"X-ray crystallography, cell-based GEF activity assays, domain mutagenesis\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with cell-based functional validation of autoinhibitory mechanism\",\n      \"pmids\": [\"23375260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FARP2 is identified as a 'RIPR' motif-dependent partner and substrate of aPKCι; binding is conferred by a FERM/FA domain–kinase domain interaction, and detachment is promoted by aPKCι-dependent phosphorylation; FARP2 promotes GTP loading of Cdc42, and aPKCι-mediated phosphorylation of FARP2 drives a positive feedback loop controlling epithelial polarization and tight junction formation.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation assays, RNAi knockdown with junction/polarity readouts, Cdc42 GTP-loading assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, kinase substrate assay, KD phenotype with polarity readout, and GTPase activation assay; multiple orthogonal methods\",\n      \"pmids\": [\"30872454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FARP2 binds to the KRK motif in the PlexinA4 cytoplasmic domain and specifically mediates Sema3A-Nrp1/PlxnA4 signaling for cortical neuron dendritic elaboration via Rac1 activation, while being dispensable for inhibitory axon guidance (growth cone collapse); this defines a modular PlxnA4/FARP2/Rac1 pathway specific to dendritic morphogenesis.\",\n      \"method\": \"CRISPR/Cas9 knock-in mice (KRK motif mutation), FARP2 knockout, Rac1 dominant-negative/constitutively-active, cortical neuron morphology quantification, growth cone collapse assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic epistasis using CRISPR knock-in plus KO, with distinct cellular phenotype readouts for dendrites vs. axons; strong mechanistic placement\",\n      \"pmids\": [\"32499377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Farp2 is a candidate gene for the HDL cholesterol QTL Hdlq14 on mouse chromosome 1; sequencing revealed an amino acid polymorphism in the pleckstrin homology domain of FARP2 associated with differences in HDL levels across inbred strains.\",\n      \"method\": \"Bioinformatics haplotype analysis, cross-strain sequencing, expression analysis, QTL confirmation intercross\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — genetic association and sequence analysis only; no direct biochemical mechanism established for FARP2 in HDL metabolism\",\n      \"pmids\": [\"18988887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FARP2 is downregulated at the mRNA level in a patient with 2q37.3 deletion syndrome (autism and brachymetaphalangy), suggesting haploinsufficiency of FARP2 may contribute to the neuropsychiatric and skeletal phenotypes of this syndrome.\",\n      \"method\": \"Array CGH, FISH, expression analysis by RT-PCR in lymphoblastoid cell lines\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3-4 — expression analysis in patient cell lines; no direct functional mechanism demonstrated\",\n      \"pmids\": [\"19365831\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FARP2 is a FERM domain-containing Dbl-family RhoGEF that is maintained in an autoinhibited conformation (DH domain blocked by its two PH domains) and is activated downstream of semaphorin/plexin receptor complexes and aPKCι to catalyze GTP loading of Rac1 and Cdc42, thereby controlling axonal repulsion, dendritic morphogenesis, osteoclast podosome rearrangement, and epithelial polarity.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"FARP2 (a FERM domain-containing RhoGEF) directly associates with plexin-A1 in the presence of neuropilin-1. Upon Sema3A binding to neuropilin-1, FARP2 dissociates from plexin-A1, leading to activation of FARP2's Rac GEF activity, Rnd1 recruitment to plexin-A1, and downregulation of R-Ras. Simultaneously, the FERM domain of FARP2 sequesters PIPKIγ661 from talin, inhibiting its kinase activity. These activities are required for Sema3A-mediated axonal repulsion and suppression of neuronal adhesion.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, GEF activity assays, dominant-negative/overexpression studies in neuronal growth cone collapse and adhesion assays\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, biochemical GEF assay, multiple orthogonal functional readouts, strong citation record\",\n      \"pmids\": [\"16286926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FARP2 is required for localized activation of GTP-bound Rac1 into podosome-ring-like structures in osteoclasts, and is relevant to integrin β3 activity during osteoclastogenesis. FARP2 deficiency results in reduced formation of multinucleated osteoclasts and resorption pits compared to wild-type controls.\",\n      \"method\": \"Live cell imaging, biochemical GEF/Rac1-GTP pulldown assays, siRNA knockdown, integrin activity assays, osteoclast differentiation and bone resorption pit assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (live imaging, biochemical assays, KD phenotype), clear mechanistic readouts\",\n      \"pmids\": [\"20702777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structures of the catalytic DH domain and the DH-PH-PH domains of FARP2 reveal an autoinhibited conformation in which the GEF substrate-binding site is blocked collectively by the last helix of the DH domain and the two PH domains, stabilized by multiple inter-domain interactions and two structured inter-domain linkers. Cell-based activity assays confirmed suppression of FARP2 GEF activity by these autoinhibitory elements.\",\n      \"method\": \"X-ray crystallography, cell-based GEF activity assays, domain mutagenesis\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional validation by cell-based assays\",\n      \"pmids\": [\"23375260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FARP2 is a substrate and binding partner of aPKCι. Binding is mediated by a FERM/FA domain–kinase domain interaction ('RIPR' motif-dependent), and aPKCι-dependent phosphorylation promotes detachment of FARP2 from aPKCι. FARP2 promotes GTP loading of Cdc42 and is required for efficient epithelial polarisation and tight junction formation. aPKCι acts in a positive feedback loop to drive localised FARP2 GEF activity.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation assays, Cdc42-GTP pulldown, siRNA knockdown with polarity/junction formation readouts, domain interaction mapping\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, biochemical GEF assay, KD phenotype with multiple cellular readouts\",\n      \"pmids\": [\"30872454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The KRK motif in the PlxnA4 cytoplasmic domain, which binds FARP2, is required for Sema3A-mediated cortical neuron dendritic elaboration but dispensable for inhibitory axon guidance. FARP2 shows identical functional specificity to the KRK motif. Sema3A activates the small GTPase Rac1 downstream of PlxnA4/FARP2, and Rac1 activity is required for dendrite elaboration but not axon growth cone collapse. This defines a novel modular Sema3A–Nrp1/PlxnA4–FARP2–Rac1 pathway controlling dendritic morphogenesis.\",\n      \"method\": \"CRISPR/Cas9 knock-in mice (PlxnA4 KRK motif mutation), FARP2 knockout, Rac1 activity assays, cortical neuron morphology analysis (dendrite arborization and axon guidance assays)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic epistasis with CRISPR knock-in, multiple orthogonal functional readouts, replicates and extends earlier mechanistic findings\",\n      \"pmids\": [\"32499377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FARP2 is located in the 2q37.3 chromosomal region deleted in a patient with autism and 2q37 deletion syndrome. Expression analysis of lymphoblastoid cell lines demonstrated that FARP2 is considerably downregulated in the patient compared to family members, suggesting haploinsufficiency of FARP2 may contribute to neuropsychiatric and skeletal phenotypes.\",\n      \"method\": \"Array CGH, FISH, quantitative gene expression analysis in lymphoblastoid cell lines\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — expression analysis in patient cells, no direct mechanistic experiment on FARP2 protein function\",\n      \"pmids\": [\"19365831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Bioinformatics and haplotype analysis narrowed a HDL-cholesterol QTL (Hdlq14) on mouse chromosome 1 to two candidate genes, Farp2 and Stk25. Sequencing revealed an amino acid polymorphism in a pleckstrin homology domain of Farp2 across inbred strains that associates with differences in HDL levels.\",\n      \"method\": \"QTL confirmation by intercross, combined cross data, haplotype analysis, sequencing of Farp2 coding sequence, expression analysis\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — genetic/bioinformatic association only, no direct mechanistic experiment on FARP2 protein\",\n      \"pmids\": [\"18988887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Systematic RhoGEF/RhoGAP family-wide characterization identified FARP2 as a widely autoinhibited RhoGEF, confirming autoinhibition as a general mechanism enabling local regulation of Rho signalling; FARP2 localization and substrate specificity were catalogued in the context of integrin adhesion-regulated RAC1 signalling.\",\n      \"method\": \"Interactome mapping (AP-MS), localization screens, substrate specificity assays across RhoGEF family\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic family-wide biochemical characterization, but FARP2-specific findings are part of a broader screen\",\n      \"pmids\": [\"32203420\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FARP2 is a FERM domain-containing Dbl-family RhoGEF that is maintained in an autoinhibited conformation (DH domain blocked by the last DH helix and two PH domains) and is activated downstream of plexin-A1/neuropilin-1 upon Sema3A stimulation to promote Rac1 (and Cdc42) activation; in neurons it controls both axonal repulsion and dendritic morphogenesis via a PlxnA4-KRK-motif/FARP2/Rac1 module, in osteoclasts it drives podosome rearrangement and bone resorption through localised Rac1 activation and integrin β3 regulation, and in epithelial cells it participates in a positive-feedback loop with aPKCι to drive Cdc42-dependent polarity and tight junction formation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FARP2 is a FERM domain-containing Dbl-family RhoGEF that catalyzes GTP loading of Rac1 and Cdc42 to control semaphorin-dependent neuronal morphogenesis, osteoclast podosome dynamics, and epithelial cell polarity. In the resting state, FARP2 adopts an autoinhibited conformation in which the DH domain catalytic site is occluded by its tandem PH domains; relief of autoinhibition occurs upon ligand-triggered dissociation from plexin receptors (PlexinA1/A4) or phosphorylation by aPKCι, enabling Rac1 or Cdc42 activation that drives cytoskeletal remodeling [PMID:16286926, PMID:23375260, PMID:30872454]. FARP2 binds PlexinA4 via a KRK motif to selectively promote Rac1-dependent dendritic elaboration in cortical neurons without affecting growth cone collapse, establishing pathway-specific roles downstream of Sema3A [PMID:32499377]. Beyond its GEF activity, the FERM domain of FARP2 sequesters PIPKIγ661 from talin to suppress integrin-mediated adhesion, and FARP2 deficiency impairs osteoclast multinucleation, podosome rearrangement, and bone resorption [PMID:16286926, PMID:20702777].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing FARP2 as the signal relay between the Sema3A/neuropilin-1/plexin-A1 receptor complex and Rac1 activation resolved how semaphorin signaling engages Rho-family GTPases for axonal repulsion, and revealed a dual mechanism: GEF-dependent Rac1 activation plus FERM domain-mediated sequestration of PIPKIγ661 to suppress adhesion.\",\n      \"evidence\": \"Co-immunoprecipitation, pulldown assays, in vitro GEF and kinase assays, and functional axon repulsion readouts in neuronal cells\",\n      \"pmids\": [\"16286926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The precise stoichiometry and kinetics of FARP2 dissociation from plexin-A1 upon Sema3A binding are unresolved\",\n        \"Whether the GEF function and FERM-mediated PIPKIγ sequestration are independently regulated was not addressed\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstration that FARP2 is required for localized Rac1 activation, podosome ring formation, and bone resorption in osteoclasts expanded its functional scope beyond neurons to bone biology and integrin β3-dependent processes.\",\n      \"evidence\": \"FARP2 knockout/knockdown osteoclasts with live imaging, GTP-Rac1 pulldown, and resorption pit assays\",\n      \"pmids\": [\"20702777\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The upstream signals that activate FARP2 GEF activity in osteoclasts (plexin-dependent or independent) are undefined\",\n        \"Whether autoinhibition relief in osteoclasts mirrors the plexin-dependent mechanism is untested\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Crystal structures of the DH and DH-PH-PH domains revealed that FARP2 is maintained in an autoinhibited state where both PH domains and the terminal DH helix collectively block substrate binding, explaining how the enzyme is kept silent until receptor-driven activation.\",\n      \"evidence\": \"X-ray crystallography of FARP2 catalytic domains combined with cell-based GEF activity assays and mutagenesis\",\n      \"pmids\": [\"23375260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The conformational transition from autoinhibited to active state has not been captured structurally\",\n        \"How plexin binding or phosphorylation events relieve the PH-domain block remains mechanistically unresolved\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of FARP2 as a RIPR motif-dependent substrate of aPKCι that catalyzes Cdc42 GTP loading established FARP2 in a positive feedback loop controlling epithelial polarity and tight junction assembly, independent of semaphorin signaling.\",\n      \"evidence\": \"Co-immunoprecipitation, phosphorylation assays, RNAi with polarity/junction readouts, and Cdc42 activation assay in epithelial cells\",\n      \"pmids\": [\"30872454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The specific phosphorylation sites on FARP2 that relieve autoinhibition are not mapped\",\n        \"Whether FARP2 activates Cdc42 versus Rac1 in a context-dependent manner or simultaneously is not resolved\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genetic dissection using KRK-motif knock-in and FARP2 knockout mice showed that FARP2 mediates a PlexinA4-specific Rac1 pathway for dendritic elaboration but is dispensable for growth cone collapse, demonstrating modular pathway-specific outputs from the same receptor.\",\n      \"evidence\": \"CRISPR/Cas9 knock-in mice, FARP2 KO, cortical neuron morphometry, and growth cone collapse assays\",\n      \"pmids\": [\"32499377\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How PlexinA4 versus PlexinA1 differentially deploy FARP2 for dendrite versus axon programs is mechanistically unclear\",\n        \"In vivo consequences of FARP2 loss on circuit-level connectivity and behavior remain uncharacterized\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis of autoinhibition relief upon receptor engagement or phosphorylation, the substrate selectivity switch between Rac1 and Cdc42, and whether FARP2 functions in additional non-neuronal tissues beyond osteoclasts and epithelia.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structure of the active or receptor-bound FARP2 conformer exists\",\n        \"The molecular determinants that specify Rac1 versus Cdc42 activation are undefined\",\n        \"Potential roles of FARP2 in immune cells, vasculature, or other integrin-dependent contexts have not been explored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 4, 5]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PLXNA1\",\n      \"PLXNA4\",\n      \"NRP1\",\n      \"PRKCI\",\n      \"RAC1\",\n      \"CDC42\",\n      \"PIPKIγ661\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"FARP2 is an autoinhibited, FERM domain-containing Dbl-family RhoGEF that couples extracellular semaphorin and integrin signals to localized Rac1 and Cdc42 activation, thereby controlling cytoskeletal remodelling in neurons, osteoclasts, and epithelial cells. Crystal structures show that its GEF activity is suppressed by an intramolecular mechanism in which the last DH helix and two tandem PH domains occlude the substrate-binding site, and release of this autoinhibition is triggered by signal-dependent dissociation from plexin-A receptors or phosphorylation by aPKCι [PMID:23375260, PMID:16286926, PMID:30872454]. In the nervous system, FARP2 operates downstream of Sema3A–Nrp1/PlxnA signalling: it dissociates from plexin-A1 upon ligand binding to activate Rac1 for growth-cone collapse, and a PlxnA4-KRK-motif/FARP2/Rac1 module selectively drives cortical dendritic elaboration [PMID:16286926, PMID:32499377]. In osteoclasts, FARP2 directs Rac1-GTP into podosome-ring structures to regulate integrin β3 activity, multinucleated osteoclast formation, and bone resorption, while in epithelial cells it participates in an aPKCι-dependent positive-feedback loop activating Cdc42 to establish apical-basal polarity and tight junctions [PMID:20702777, PMID:30872454].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"The central question of how Sema3A receptor signalling engages a GEF was answered by showing that FARP2 directly binds plexin-A1/neuropilin-1 and, upon Sema3A stimulation, dissociates to activate Rac, recruit Rnd1 to plexin, and suppress R-Ras—establishing FARP2 as the signal-coupling GEF for axonal repulsion.\",\n      \"evidence\": \"Co-IP, pulldown, GEF activity assays, and functional growth-cone collapse/adhesion assays in neurons\",\n      \"pmids\": [\"16286926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for FARP2–plexin-A1 interaction and the release mechanism not determined\",\n        \"Whether FARP2 GEF activity toward Cdc42 versus Rac1 is context-dependent was not resolved\",\n        \"FARP2 FERM-domain sequestration of PIPKIγ661 not confirmed in vivo\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extending FARP2 function beyond neurons, its requirement for localized Rac1-GTP accumulation in osteoclast podosome rings and for integrin β3-dependent bone resorption established a general role in adhesion-coupled cytoskeletal remodelling.\",\n      \"evidence\": \"Live imaging, Rac1-GTP pulldowns, siRNA knockdown, and osteoclast differentiation/resorption pit assays\",\n      \"pmids\": [\"20702777\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Upstream signal activating FARP2 GEF release in osteoclasts not identified\",\n        \"Whether the autoinhibitory mechanism is identical to that in the plexin pathway was unknown\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The structural basis of FARP2 autoinhibition was resolved: crystal structures revealed that the last DH helix and tandem PH domains cooperatively occlude the GTPase-binding surface, explaining how the enzyme stays silent until activated by upstream signals.\",\n      \"evidence\": \"X-ray crystallography of DH and DH-PH-PH domains with cell-based GEF assays and domain mutagenesis\",\n      \"pmids\": [\"23375260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structure of full-length FARP2 including the FERM domain\",\n        \"Mechanism by which upstream signals relieve autoinhibition (conformational change versus post-translational modification) not visualised\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovery that aPKCι directly binds and phosphorylates FARP2 to promote its detachment and Cdc42-directed GEF activity revealed a second activation pathway operating in epithelial polarity and tight junction formation, independent of plexin signalling.\",\n      \"evidence\": \"Co-IP, phosphorylation assays, Cdc42-GTP pulldowns, siRNA knockdown with polarity and junction readouts, domain interaction mapping\",\n      \"pmids\": [\"30872454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the phosphorylation site(s) and whether they directly relieve the DH-PH-PH autoinhibition not resolved\",\n        \"Whether aPKCι-FARP2 loop operates in non-epithelial contexts is unknown\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genetic epistasis in mice showed that the PlxnA4-KRK motif/FARP2/Rac1 module selectively controls dendritic elaboration but not axon guidance, demonstrating that FARP2 segregates distinct morphogenetic outputs of Sema3A signalling through the same receptor.\",\n      \"evidence\": \"CRISPR knock-in PlxnA4 mutant mice, FARP2 knockout mice, Rac1 activity assays, cortical neuron morphology analysis\",\n      \"pmids\": [\"32499377\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular basis of how the KRK motif selectively recruits FARP2 versus other effectors not determined\",\n        \"Whether FARP2 contributes to dendrite morphogenesis in non-cortical neuron types is untested\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Family-wide systematic characterisation confirmed FARP2 autoinhibition as representative of a general RhoGEF regulatory principle and placed FARP2 within integrin adhesion-regulated Rac1 signalling networks.\",\n      \"evidence\": \"AP-MS interactome mapping, localization screens, substrate specificity assays across the RhoGEF family\",\n      \"pmids\": [\"32203420\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"FARP2-specific interactors identified in the screen were not individually validated\",\n        \"Quantitative parameters of FARP2 catalytic efficiency versus other RhoGEFs not compared\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The mechanism by which upstream signals (plexin dissociation, aPKCι phosphorylation) relieve the structurally characterised DH-PH-PH autoinhibition remains unresolved, and a full-length structure incorporating the FERM domain is lacking.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No full-length structure of FARP2\",\n        \"Activation mechanism connecting signal reception to relief of DH-PH-PH autoinhibition not visualised\",\n        \"In vivo genetic models for non-neuronal FARP2 functions (epithelial polarity, osteoclast biology) are limited\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 3, 4, 7]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 4, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PLXNA1\",\n      \"PLXNA4\",\n      \"NRP1\",\n      \"PRKCL\",\n      \"RAC1\",\n      \"CDC42\",\n      \"ITGB3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}