{"gene":"ARHGAP9","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2001,"finding":"ARHGAP9 encodes a Rho-GTPase activating protein with a GAP domain, SH3 domain, PH domain, and WW domain; recombinant protein shows substantial GAP activity toward Cdc42Hs and Rac1 in vitro, and less toward RhoA; exogenous expression in KG-1 hematopoietic cells represses adhesion to fibronectin and collagen IV","method":"In vitro GAP activity assay with recombinant protein; overexpression in human leukemia KG-1 cells with adhesion assay readout","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1-2 — original discovery paper with in vitro enzymatic assay plus functional cellular phenotype, foundational study","pmids":["11396949"],"is_preprint":false},{"year":2007,"finding":"The PH domain of ARHGAP9 binds phosphoinositides PI(4,5)P2, PI(3,4,5)P3, and PI(3,4)P2 through a non-canonical binding pocket; crystal structures of the ARHGAP9 PH domain in complex with Ins(1,3,4)P3, Ins(1,4,5)P3, and Ins(1,3,5)P3 reveal two adjacent phosphate positions accommodated through flipped conformations of the bound phospholipid; binding pocket mutations disrupt phosphoinositide binding in vitro","method":"X-ray crystallography (crystal structures of PH domain with inositol phosphate headgroups); in vitro phosphoinositide binding assays; mutagenesis of binding pocket residues","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structures at atomic resolution combined with mutagenesis and in vitro binding validation","pmids":["17339315"],"is_preprint":false},{"year":2007,"finding":"ARHGAP9 acts as a novel MAP kinase docking protein that interacts with Erk2 and p38alpha through complementarily charged residues in its WW domain and the CD domains of Erk2/p38alpha, sequestering MAP kinases in inactive states by displacing MAP kinase kinases; overexpression of wild-type ARHGAP9 suppresses EGFR-induced Erk and p38 activation and preserves actin stress fibres, while a WW-domain mutant defective in MAP kinase binding restores MAP kinase activation and causes stress fibre disruption","method":"Co-immunoprecipitation; overexpression of wild-type and WW-domain mutant ARHGAP9 in Swiss 3T3 fibroblasts; EGFR stimulation with MAP kinase activation readout; actin stress fibre imaging","journal":"Journal of molecular signaling","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal interaction mapping with domain mutants plus functional cellular phenotype, single lab","pmids":["17284314"],"is_preprint":false},{"year":2009,"finding":"ARHGAP9 functions as a RacGAP that negatively regulates cell migration, spreading, and adhesion; the naturally occurring Ala370Ser polymorphism (rs11544238) counteracts ARHGAP9-mediated reduction of cell migration, spreading, and adhesion, and is associated with coronary artery spasm","method":"In vitro GAP activity assay for Rac; cell migration, spreading, and adhesion assays comparing wild-type and Ala370Ser variant ARHGAP9","journal":"Journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — functional assays with both wild-type and variant protein establishing mechanistic consequence of polymorphism","pmids":["19911011"],"is_preprint":false},{"year":2018,"finding":"ARHGAP9 inhibits HCC cell migration and invasion through upregulation of the transcription factor FOXJ2, which directly binds the E-cadherin (CDH1) promoter and enhances its transcription; FOXJ2 knockdown attenuates ARHGAP9's anti-migratory effects; ChIP assay confirmed FOXJ2 binding to CDH1 promoter","method":"RNA-seq after ARHGAP9 overexpression; luciferase reporter assay for CDH1 promoter; ChIP assay; FOXJ2 knockdown rescue experiments; transwell migration/invasion assays; in vivo lung metastasis assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (ChIP, luciferase, rescue experiments, in vivo) in a single lab","pmids":["30206221"],"is_preprint":false},{"year":2022,"finding":"ARHGAP9 inhibits colorectal cancer cell proliferation, invasion, and EMT by suppressing activation of the PI3K/AKT/mTOR signaling pathway; knockdown of ARHGAP9 activates this pathway, and pharmacological blockade of PI3K/AKT/mTOR reverses the effects of ARHGAP9 knockdown","method":"Overexpression and knockdown in CRC cell lines; Western blot for PI3K/AKT/mTOR pathway components; PI3K inhibitor (LY294002) rescue; xenograft mouse model","journal":"Tissue & cell","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis established by pharmacological inhibitor rescue plus in vivo validation","pmids":["35679685"],"is_preprint":false},{"year":2023,"finding":"ARHGAP9 knockdown promotes lung adenocarcinoma metastasis by suppressing DKK2 expression, which activates the Wnt/β-catenin signaling pathway; overexpression of DKK2 in ARHGAP9-knockdown cells reverses the pro-metastatic phenotype and reduces Wnt/β-catenin activity","method":"RNA sequencing after ARHGAP9 knockdown; DKK2 overexpression rescue in ARHGAP9-knockdown cells; cell proliferation, migration, invasion assays; Wnt/β-catenin pathway reporter analysis","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — pathway placement by genetic epistasis with rescue experiment","pmids":["37454937"],"is_preprint":false},{"year":2022,"finding":"GATA5 transcription factor directly activates ARHGAP9 transcription by binding to the ARHGAP9 promoter; GATA5-induced ARHGAP9 upregulation inhibits lung adenocarcinoma cell proliferation, invasion, and migration; GATA5 silencing reverses the inhibitory effect of ARHGAP9 upregulation on malignant progression","method":"Luciferase reporter assay; ChIP assay for GATA5 binding to ARHGAP9 promoter; GATA5 knockdown and ARHGAP9 overexpression rescue experiments; CCK-8, EDU, transwell assays","journal":"Bioengineered","confidence":"Medium","confidence_rationale":"Tier 2 — direct transcriptional regulation confirmed by ChIP and luciferase with functional rescue","pmids":["35040754"],"is_preprint":false},{"year":2021,"finding":"SOX4 transcription factor directly binds the ARHGAP9 promoter and drives ARHGAP9 expression in AML cells; ARHGAP9 interference reduces AML cell viability, induces G1 cell cycle arrest, and promotes apoptosis with associated changes in cyclin D1, cyclin E1, CDK4, CDK6, Bcl-2, Bax, and caspase-3/9","method":"Luciferase reporter assay; ChIP assay confirming SOX4 binding to ARHGAP9 promoter; siRNA knockdown; flow cytometry for cell cycle and apoptosis; Western blot","journal":"Drug development research","confidence":"Medium","confidence_rationale":"Tier 2 — direct transcriptional regulation confirmed by ChIP and luciferase, functional downstream effects characterized","pmids":["34159626"],"is_preprint":false},{"year":2025,"finding":"Knockdown of ARHGAP9 significantly inhibits the proliferative capacity of vascular smooth muscle cells (VSMCs), implicating ARHGAP9 in VSMC biology relevant to abdominal aortic aneurysm","method":"In vitro ARHGAP9 knockdown in VSMCs with proliferation assay readout; machine learning-based identification from multiomics data","journal":"Human mutation","confidence":"Low","confidence_rationale":"Tier 3 — single functional experiment (KD + proliferation assay) with no pathway placement","pmids":["40995065"],"is_preprint":false}],"current_model":"ARHGAP9 is a multi-domain RhoGAP (containing GAP, SH3, PH, and WW domains) that inactivates Cdc42 and Rac1 (and to a lesser extent RhoA) by stimulating GTP hydrolysis; its PH domain uses a non-canonical binding pocket to engage PI(4,5)P2, PI(3,4,5)P3, and PI(3,4)P2; its WW domain sequesters Erk2 and p38alpha in inactive states, suppressing MAP kinase signaling; and it inhibits cell migration, invasion, and EMT downstream of RhoGTPase inactivation through pathways including FOXJ2/E-cadherin upregulation, PI3K/AKT/mTOR suppression, and DKK2-mediated inhibition of Wnt/β-catenin signaling, while its transcription is positively regulated by GATA5 and SOX4."},"narrative":{"teleology":[{"year":2001,"claim":"The identification of ARHGAP9 as a multi-domain RhoGAP with preferential activity toward Cdc42 and Rac1 established its enzymatic function and first linked it to cell adhesion regulation in hematopoietic cells.","evidence":"In vitro GAP activity assay with recombinant protein and adhesion assays in KG-1 leukemia cells","pmids":["11396949"],"confidence":"High","gaps":["Mechanism by which GAP activity is regulated in cells was not addressed","Relative contribution of each domain to cellular adhesion phenotype not dissected"]},{"year":2007,"claim":"Structural determination of the PH domain–inositol phosphate complexes revealed a non-canonical phosphoinositide-binding pocket accommodating multiple lipid headgroups, explaining how ARHGAP9 could be recruited to diverse membrane microenvironments.","evidence":"X-ray crystallography of PH domain with Ins(1,3,4)P3, Ins(1,4,5)P3, and Ins(1,3,5)P3; mutagenesis and in vitro binding assays","pmids":["17339315"],"confidence":"High","gaps":["Whether PH domain lipid binding is required for GAP activity in cells was not tested","Physiological membrane context of PH domain engagement not established"]},{"year":2007,"claim":"Discovery that the WW domain of ARHGAP9 directly sequesters Erk2 and p38α away from their upstream kinases uncovered a GAP-independent signaling function, demonstrating that ARHGAP9 integrates Rho-GTPase and MAP kinase pathway regulation.","evidence":"Co-immunoprecipitation, overexpression of wild-type and WW-domain mutant ARHGAP9 in Swiss 3T3 fibroblasts with EGFR stimulation","pmids":["17284314"],"confidence":"Medium","gaps":["Endogenous interaction with MAP kinases not validated","Whether WW-mediated MAPK sequestration occurs in hematopoietic cells is unknown","Structural basis of WW–CD domain interaction not resolved"]},{"year":2009,"claim":"Characterization of the Ala370Ser polymorphism showed that a single residue change attenuates ARHGAP9's Rac-GAP activity and anti-migratory function, linking natural human genetic variation to altered ARHGAP9 activity.","evidence":"In vitro Rac-GAP assay and cell migration/spreading/adhesion assays comparing wild-type and A370S ARHGAP9","pmids":["19911011"],"confidence":"Medium","gaps":["Coronary artery spasm association is genetic correlation, not mechanistically explained","Whether A370S affects GAP domain structure or substrate access is unresolved"]},{"year":2018,"claim":"Identification of the FOXJ2–E-cadherin axis as a downstream effector of ARHGAP9 provided the first transcriptional pathway through which ARHGAP9's GAP activity suppresses cell invasion.","evidence":"RNA-seq, ChIP for FOXJ2 on CDH1 promoter, luciferase reporter, FOXJ2 knockdown rescue, and in vivo lung metastasis assay in HCC models","pmids":["30206221"],"confidence":"Medium","gaps":["How Rho-GTPase inactivation leads to FOXJ2 upregulation is not defined","Generality beyond hepatocellular carcinoma cells not established"]},{"year":2021,"claim":"Demonstration that SOX4 directly binds and activates the ARHGAP9 promoter in AML cells revealed a first transcriptional regulator of ARHGAP9 and linked its expression to hematopoietic cell proliferation and survival.","evidence":"ChIP assay, luciferase reporter for ARHGAP9 promoter, siRNA knockdown, flow cytometry for cell cycle and apoptosis in AML cells","pmids":["34159626"],"confidence":"Medium","gaps":["Whether SOX4 regulation of ARHGAP9 operates outside AML is unknown","Functional rescue by re-expression of ARHGAP9 after SOX4 knockdown not performed"]},{"year":2022,"claim":"Placing ARHGAP9 upstream of PI3K/AKT/mTOR suppression and identification of GATA5 as a second direct transcriptional activator extended the signaling framework to colorectal cancer and lung adenocarcinoma, respectively.","evidence":"PI3K inhibitor epistasis rescue in CRC cells with xenograft validation; ChIP and luciferase for GATA5 on ARHGAP9 promoter in LUAD cells","pmids":["35679685","35040754"],"confidence":"Medium","gaps":["Direct Rho-GTPase target mediating PI3K/AKT/mTOR suppression not identified","Whether GATA5 and SOX4 regulate ARHGAP9 in the same cell lineage is untested"]},{"year":2023,"claim":"Genetic epistasis experiments showed ARHGAP9 restrains Wnt/β-catenin signaling through DKK2 maintenance, adding a third downstream effector pathway.","evidence":"RNA-seq, DKK2 overexpression rescue in ARHGAP9-knockdown LUAD cells, Wnt reporter assays","pmids":["37454937"],"confidence":"Medium","gaps":["Mechanism linking Rho-GTPase inactivation to DKK2 transcriptional control is undefined","Whether DKK2 axis operates in non-cancer contexts is unknown"]},{"year":null,"claim":"The proximal signaling events connecting ARHGAP9's GAP activity to its diverse transcriptional effector pathways (FOXJ2, PI3K/AKT/mTOR, DKK2/Wnt) remain undefined, and the physiological integration of its GAP-dependent and WW-domain-mediated MAPK-sequestering functions has not been dissected in an endogenous setting.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No endogenous loss-of-function study has simultaneously assessed GAP-dependent and WW-domain-dependent signaling","Structural basis for how GAP activity is regulated by PH-domain membrane recruitment in cells is lacking","Role in normal hematopoiesis versus leukemia not genetically resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,3]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[1]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[2]}],"localization":[],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,3,5,6]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,4]}],"complexes":[],"partners":["CDC42","RAC1","MAPK1","MAPK14","FOXJ2","GATA5","SOX4","DKK2"],"other_free_text":[]},"mechanistic_narrative":"ARHGAP9 is a multi-domain Rho-GTPase activating protein that inactivates Cdc42 and Rac1 (and weakly RhoA) to suppress cell adhesion, migration, invasion, and epithelial-mesenchymal transition. Its GAP domain catalyzes GTP hydrolysis on Rho-family GTPases, while its PH domain engages PI(4,5)P2, PI(3,4,5)P3, and PI(3,4)P2 through a structurally characterized non-canonical binding pocket, and its WW domain sequesters Erk2 and p38α MAP kinases in inactive conformations, thereby dampening MAPK signaling independently of GAP activity [PMID:11396949, PMID:17339315, PMID:17284314]. Downstream of RhoGTPase inactivation, ARHGAP9 restrains cell migration and invasion through multiple effector axes including FOXJ2-dependent E-cadherin upregulation, suppression of PI3K/AKT/mTOR signaling, and DKK2-mediated inhibition of Wnt/β-catenin signaling [PMID:30206221, PMID:35679685, PMID:37454937]. Its transcription is directly activated by the transcription factors GATA5 and SOX4, linking its expression to lineage-specific programs in lung and hematopoietic cells [PMID:35040754, PMID:34159626]."},"prefetch_data":{"uniprot":{"accession":"Q9BRR9","full_name":"Rho GTPase-activating protein 9","aliases":["Rho-type GTPase-activating protein 9"],"length_aa":750,"mass_kda":83.3,"function":"GTPase activator for the Rho-type GTPases by converting them to an inactive GDP-bound state. Has a substantial GAP activity toward CDC42 and RAC1 and less toward RHOA. Has a role in regulating adhesion of hematopoietic cells to the extracellular matrix. Binds phosphoinositides, and has the highest affinity for phosphatidylinositol 3,4,5-trisphosphate, followed by phosphatidylinositol 3,4-bisphosphate and phosphatidylinositol 4,5-bisphosphate","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q9BRR9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ARHGAP9","classification":"Not Classified","n_dependent_lines":69,"n_total_lines":1208,"dependency_fraction":0.057119205298013245},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ARHGAP9","total_profiled":1310},"omim":[{"mim_id":"610578","title":"RHO GTPase-ACTIVATING PROTEIN 15; ARHGAP15","url":"https://www.omim.org/entry/610578"},{"mim_id":"610577","title":"RHO GTPase-ACTIVATING PROTEIN 12; ARHGAP12","url":"https://www.omim.org/entry/610577"},{"mim_id":"610576","title":"RHO GTPase-ACTIVATING PROTEIN 9; ARHGAP9","url":"https://www.omim.org/entry/610576"},{"mim_id":"606039","title":"HYDROXYCARBOXYLIC ACID RECEPTOR 3; HCAR3","url":"https://www.omim.org/entry/606039"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cell Junctions","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":113.0},{"tissue":"lymphoid tissue","ntpm":96.5}],"url":"https://www.proteinatlas.org/search/ARHGAP9"},"hgnc":{"alias_symbol":["MGC1295","10C"],"prev_symbol":[]},"alphafold":{"accession":"Q9BRR9","domains":[{"cath_id":"2.30.30.40","chopping":"27-87","consensus_level":"medium","plddt":87.4954,"start":27,"end":87},{"cath_id":"2.30.29.30","chopping":"326-365_378-445","consensus_level":"high","plddt":83.742,"start":326,"end":445},{"cath_id":"1.10.555.10","chopping":"545-749","consensus_level":"high","plddt":86.7101,"start":545,"end":749}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BRR9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BRR9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BRR9-F1-predicted_aligned_error_v6.png","plddt_mean":66.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ARHGAP9","jax_strain_url":"https://www.jax.org/strain/search?query=ARHGAP9"},"sequence":{"accession":"Q9BRR9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BRR9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BRR9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BRR9"}},"corpus_meta":[{"pmid":"17339315","id":"PMC_17339315","title":"Non-canonical 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recombinant protein shows substantial GAP activity toward Cdc42Hs and Rac1 in vitro, and less toward RhoA; exogenous expression in KG-1 hematopoietic cells represses adhesion to fibronectin and collagen IV\",\n      \"method\": \"In vitro GAP activity assay with recombinant protein; overexpression in human leukemia KG-1 cells with adhesion assay readout\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — original discovery paper with in vitro enzymatic assay plus functional cellular phenotype, foundational study\",\n      \"pmids\": [\"11396949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The PH domain of ARHGAP9 binds phosphoinositides PI(4,5)P2, PI(3,4,5)P3, and PI(3,4)P2 through a non-canonical binding pocket; crystal structures of the ARHGAP9 PH domain in complex with Ins(1,3,4)P3, Ins(1,4,5)P3, and Ins(1,3,5)P3 reveal two adjacent phosphate positions accommodated through flipped conformations of the bound phospholipid; binding pocket mutations disrupt phosphoinositide binding in vitro\",\n      \"method\": \"X-ray crystallography (crystal structures of PH domain with inositol phosphate headgroups); in vitro phosphoinositide binding assays; mutagenesis of binding pocket residues\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structures at atomic resolution combined with mutagenesis and in vitro binding validation\",\n      \"pmids\": [\"17339315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ARHGAP9 acts as a novel MAP kinase docking protein that interacts with Erk2 and p38alpha through complementarily charged residues in its WW domain and the CD domains of Erk2/p38alpha, sequestering MAP kinases in inactive states by displacing MAP kinase kinases; overexpression of wild-type ARHGAP9 suppresses EGFR-induced Erk and p38 activation and preserves actin stress fibres, while a WW-domain mutant defective in MAP kinase binding restores MAP kinase activation and causes stress fibre disruption\",\n      \"method\": \"Co-immunoprecipitation; overexpression of wild-type and WW-domain mutant ARHGAP9 in Swiss 3T3 fibroblasts; EGFR stimulation with MAP kinase activation readout; actin stress fibre imaging\",\n      \"journal\": \"Journal of molecular signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction mapping with domain mutants plus functional cellular phenotype, single lab\",\n      \"pmids\": [\"17284314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ARHGAP9 functions as a RacGAP that negatively regulates cell migration, spreading, and adhesion; the naturally occurring Ala370Ser polymorphism (rs11544238) counteracts ARHGAP9-mediated reduction of cell migration, spreading, and adhesion, and is associated with coronary artery spasm\",\n      \"method\": \"In vitro GAP activity assay for Rac; cell migration, spreading, and adhesion assays comparing wild-type and Ala370Ser variant ARHGAP9\",\n      \"journal\": \"Journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional assays with both wild-type and variant protein establishing mechanistic consequence of polymorphism\",\n      \"pmids\": [\"19911011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ARHGAP9 inhibits HCC cell migration and invasion through upregulation of the transcription factor FOXJ2, which directly binds the E-cadherin (CDH1) promoter and enhances its transcription; FOXJ2 knockdown attenuates ARHGAP9's anti-migratory effects; ChIP assay confirmed FOXJ2 binding to CDH1 promoter\",\n      \"method\": \"RNA-seq after ARHGAP9 overexpression; luciferase reporter assay for CDH1 promoter; ChIP assay; FOXJ2 knockdown rescue experiments; transwell migration/invasion assays; in vivo lung metastasis assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ChIP, luciferase, rescue experiments, in vivo) in a single lab\",\n      \"pmids\": [\"30206221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ARHGAP9 inhibits colorectal cancer cell proliferation, invasion, and EMT by suppressing activation of the PI3K/AKT/mTOR signaling pathway; knockdown of ARHGAP9 activates this pathway, and pharmacological blockade of PI3K/AKT/mTOR reverses the effects of ARHGAP9 knockdown\",\n      \"method\": \"Overexpression and knockdown in CRC cell lines; Western blot for PI3K/AKT/mTOR pathway components; PI3K inhibitor (LY294002) rescue; xenograft mouse model\",\n      \"journal\": \"Tissue & cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis established by pharmacological inhibitor rescue plus in vivo validation\",\n      \"pmids\": [\"35679685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ARHGAP9 knockdown promotes lung adenocarcinoma metastasis by suppressing DKK2 expression, which activates the Wnt/β-catenin signaling pathway; overexpression of DKK2 in ARHGAP9-knockdown cells reverses the pro-metastatic phenotype and reduces Wnt/β-catenin activity\",\n      \"method\": \"RNA sequencing after ARHGAP9 knockdown; DKK2 overexpression rescue in ARHGAP9-knockdown cells; cell proliferation, migration, invasion assays; Wnt/β-catenin pathway reporter analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pathway placement by genetic epistasis with rescue experiment\",\n      \"pmids\": [\"37454937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GATA5 transcription factor directly activates ARHGAP9 transcription by binding to the ARHGAP9 promoter; GATA5-induced ARHGAP9 upregulation inhibits lung adenocarcinoma cell proliferation, invasion, and migration; GATA5 silencing reverses the inhibitory effect of ARHGAP9 upregulation on malignant progression\",\n      \"method\": \"Luciferase reporter assay; ChIP assay for GATA5 binding to ARHGAP9 promoter; GATA5 knockdown and ARHGAP9 overexpression rescue experiments; CCK-8, EDU, transwell assays\",\n      \"journal\": \"Bioengineered\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct transcriptional regulation confirmed by ChIP and luciferase with functional rescue\",\n      \"pmids\": [\"35040754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SOX4 transcription factor directly binds the ARHGAP9 promoter and drives ARHGAP9 expression in AML cells; ARHGAP9 interference reduces AML cell viability, induces G1 cell cycle arrest, and promotes apoptosis with associated changes in cyclin D1, cyclin E1, CDK4, CDK6, Bcl-2, Bax, and caspase-3/9\",\n      \"method\": \"Luciferase reporter assay; ChIP assay confirming SOX4 binding to ARHGAP9 promoter; siRNA knockdown; flow cytometry for cell cycle and apoptosis; Western blot\",\n      \"journal\": \"Drug development research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct transcriptional regulation confirmed by ChIP and luciferase, functional downstream effects characterized\",\n      \"pmids\": [\"34159626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Knockdown of ARHGAP9 significantly inhibits the proliferative capacity of vascular smooth muscle cells (VSMCs), implicating ARHGAP9 in VSMC biology relevant to abdominal aortic aneurysm\",\n      \"method\": \"In vitro ARHGAP9 knockdown in VSMCs with proliferation assay readout; machine learning-based identification from multiomics data\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single functional experiment (KD + proliferation assay) with no pathway placement\",\n      \"pmids\": [\"40995065\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ARHGAP9 is a multi-domain RhoGAP (containing GAP, SH3, PH, and WW domains) that inactivates Cdc42 and Rac1 (and to a lesser extent RhoA) by stimulating GTP hydrolysis; its PH domain uses a non-canonical binding pocket to engage PI(4,5)P2, PI(3,4,5)P3, and PI(3,4)P2; its WW domain sequesters Erk2 and p38alpha in inactive states, suppressing MAP kinase signaling; and it inhibits cell migration, invasion, and EMT downstream of RhoGTPase inactivation through pathways including FOXJ2/E-cadherin upregulation, PI3K/AKT/mTOR suppression, and DKK2-mediated inhibition of Wnt/β-catenin signaling, while its transcription is positively regulated by GATA5 and SOX4.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ARHGAP9 is a multi-domain Rho-GTPase activating protein that inactivates Cdc42 and Rac1 (and weakly RhoA) to suppress cell adhesion, migration, invasion, and epithelial-mesenchymal transition. Its GAP domain catalyzes GTP hydrolysis on Rho-family GTPases, while its PH domain engages PI(4,5)P2, PI(3,4,5)P3, and PI(3,4)P2 through a structurally characterized non-canonical binding pocket, and its WW domain sequesters Erk2 and p38α MAP kinases in inactive conformations, thereby dampening MAPK signaling independently of GAP activity [PMID:11396949, PMID:17339315, PMID:17284314]. Downstream of RhoGTPase inactivation, ARHGAP9 restrains cell migration and invasion through multiple effector axes including FOXJ2-dependent E-cadherin upregulation, suppression of PI3K/AKT/mTOR signaling, and DKK2-mediated inhibition of Wnt/β-catenin signaling [PMID:30206221, PMID:35679685, PMID:37454937]. Its transcription is directly activated by the transcription factors GATA5 and SOX4, linking its expression to lineage-specific programs in lung and hematopoietic cells [PMID:35040754, PMID:34159626].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"The identification of ARHGAP9 as a multi-domain RhoGAP with preferential activity toward Cdc42 and Rac1 established its enzymatic function and first linked it to cell adhesion regulation in hematopoietic cells.\",\n      \"evidence\": \"In vitro GAP activity assay with recombinant protein and adhesion assays in KG-1 leukemia cells\",\n      \"pmids\": [\"11396949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which GAP activity is regulated in cells was not addressed\",\n        \"Relative contribution of each domain to cellular adhesion phenotype not dissected\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Structural determination of the PH domain–inositol phosphate complexes revealed a non-canonical phosphoinositide-binding pocket accommodating multiple lipid headgroups, explaining how ARHGAP9 could be recruited to diverse membrane microenvironments.\",\n      \"evidence\": \"X-ray crystallography of PH domain with Ins(1,3,4)P3, Ins(1,4,5)P3, and Ins(1,3,5)P3; mutagenesis and in vitro binding assays\",\n      \"pmids\": [\"17339315\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether PH domain lipid binding is required for GAP activity in cells was not tested\",\n        \"Physiological membrane context of PH domain engagement not established\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that the WW domain of ARHGAP9 directly sequesters Erk2 and p38α away from their upstream kinases uncovered a GAP-independent signaling function, demonstrating that ARHGAP9 integrates Rho-GTPase and MAP kinase pathway regulation.\",\n      \"evidence\": \"Co-immunoprecipitation, overexpression of wild-type and WW-domain mutant ARHGAP9 in Swiss 3T3 fibroblasts with EGFR stimulation\",\n      \"pmids\": [\"17284314\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Endogenous interaction with MAP kinases not validated\",\n        \"Whether WW-mediated MAPK sequestration occurs in hematopoietic cells is unknown\",\n        \"Structural basis of WW–CD domain interaction not resolved\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Characterization of the Ala370Ser polymorphism showed that a single residue change attenuates ARHGAP9's Rac-GAP activity and anti-migratory function, linking natural human genetic variation to altered ARHGAP9 activity.\",\n      \"evidence\": \"In vitro Rac-GAP assay and cell migration/spreading/adhesion assays comparing wild-type and A370S ARHGAP9\",\n      \"pmids\": [\"19911011\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Coronary artery spasm association is genetic correlation, not mechanistically explained\",\n        \"Whether A370S affects GAP domain structure or substrate access is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of the FOXJ2–E-cadherin axis as a downstream effector of ARHGAP9 provided the first transcriptional pathway through which ARHGAP9's GAP activity suppresses cell invasion.\",\n      \"evidence\": \"RNA-seq, ChIP for FOXJ2 on CDH1 promoter, luciferase reporter, FOXJ2 knockdown rescue, and in vivo lung metastasis assay in HCC models\",\n      \"pmids\": [\"30206221\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"How Rho-GTPase inactivation leads to FOXJ2 upregulation is not defined\",\n        \"Generality beyond hepatocellular carcinoma cells not established\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstration that SOX4 directly binds and activates the ARHGAP9 promoter in AML cells revealed a first transcriptional regulator of ARHGAP9 and linked its expression to hematopoietic cell proliferation and survival.\",\n      \"evidence\": \"ChIP assay, luciferase reporter for ARHGAP9 promoter, siRNA knockdown, flow cytometry for cell cycle and apoptosis in AML cells\",\n      \"pmids\": [\"34159626\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether SOX4 regulation of ARHGAP9 operates outside AML is unknown\",\n        \"Functional rescue by re-expression of ARHGAP9 after SOX4 knockdown not performed\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placing ARHGAP9 upstream of PI3K/AKT/mTOR suppression and identification of GATA5 as a second direct transcriptional activator extended the signaling framework to colorectal cancer and lung adenocarcinoma, respectively.\",\n      \"evidence\": \"PI3K inhibitor epistasis rescue in CRC cells with xenograft validation; ChIP and luciferase for GATA5 on ARHGAP9 promoter in LUAD cells\",\n      \"pmids\": [\"35679685\", \"35040754\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct Rho-GTPase target mediating PI3K/AKT/mTOR suppression not identified\",\n        \"Whether GATA5 and SOX4 regulate ARHGAP9 in the same cell lineage is untested\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Genetic epistasis experiments showed ARHGAP9 restrains Wnt/β-catenin signaling through DKK2 maintenance, adding a third downstream effector pathway.\",\n      \"evidence\": \"RNA-seq, DKK2 overexpression rescue in ARHGAP9-knockdown LUAD cells, Wnt reporter assays\",\n      \"pmids\": [\"37454937\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking Rho-GTPase inactivation to DKK2 transcriptional control is undefined\",\n        \"Whether DKK2 axis operates in non-cancer contexts is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The proximal signaling events connecting ARHGAP9's GAP activity to its diverse transcriptional effector pathways (FOXJ2, PI3K/AKT/mTOR, DKK2/Wnt) remain undefined, and the physiological integration of its GAP-dependent and WW-domain-mediated MAPK-sequestering functions has not been dissected in an endogenous setting.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No endogenous loss-of-function study has simultaneously assessed GAP-dependent and WW-domain-dependent signaling\",\n        \"Structural basis for how GAP activity is regulated by PH-domain membrane recruitment in cells is lacking\",\n        \"Role in normal hematopoiesis versus leukemia not genetically resolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 3, 5, 6]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CDC42\",\n      \"RAC1\",\n      \"MAPK1\",\n      \"MAPK14\",\n      \"FOXJ2\",\n      \"GATA5\",\n      \"SOX4\",\n      \"DKK2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}