{"gene":"ARHGAP18","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2011,"finding":"ARHGAP18 (MacGAP) functions as a GTPase-activating protein for RhoA: overexpression suppresses RhoA activity and disrupts stress fiber formation, while siRNA knockdown enhances stress fibers, induces cell rounding, and causes sustained RhoA activation upon cell attachment. ARHGAP18 localizes to the leading edge during cell spreading and migration and is required for cell polarization.","method":"siRNA knockdown, overexpression, immunofluorescence, RhoA activity assays, cell spreading/migration assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain/loss-of-function with multiple orthogonal readouts (RhoA activity, stress fibers, localization, migration); foundational mechanistic paper replicated by subsequent studies","pmids":["21865595"],"is_preprint":false},{"year":2013,"finding":"The Drosophila ARHGAP18 orthologue Conundrum (Conu) interacts with Moesin (ERM protein), which recruits Conu to the cell cortex to negatively regulate RhoA activity. Cortically localized Conu promotes cell proliferation in a RhoGAP activity-dependent manner, and this growth-promoting function also appears dependent on increased Rac activity.","method":"Co-immunoprecipitation, genetic epistasis, cortical localization assays, RhoA activity assays, cell proliferation assays in Drosophila","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction, cortical localization rescue, GAP-domain mutagenesis functional requirement; ortholog study with multiple orthogonal methods","pmids":["23468526"],"is_preprint":false},{"year":2014,"finding":"ARHGAP18 acts as a negative regulator of angiogenesis: loss of ARHGAP18 promotes endothelial cell hypersprouting in zebrafish and murine retinal vessel development. Endogenous ARHGAP18 acts specifically on RhoC (not other Rho isoforms) and relocalizes to angiogenic/destabilized EC junctions in a ROCK-dependent manner, suppressing tip cell behavior and stabilizing junctions at least partially through regulation of Dll4, Flk-1, and Flt-4.","method":"Zebrafish knockdown, murine retinal vessel analysis, siRNA in endothelial cells, ROCK inhibitor treatment, immunofluorescence localization, RhoC-specific activity assays","journal":"Small GTPases","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo (zebrafish + mouse) and in vitro loss-of-function with multiple orthogonal readouts; RhoC specificity established; replicated in two species","pmids":["25425145"],"is_preprint":false},{"year":2010,"finding":"SENEX (ARHGAP18) regulates stress-induced premature senescence (SIPS) in endothelial cells through the p16(INK4a)/retinoblastoma protein pathway; depletion by siRNA or high-dose H2O2 causes apoptosis, establishing SENEX as essential for EC survival. SENEX levels are regulated by H2O2-mediated stress but unchanged during replicative senescence.","method":"siRNA knockdown, H2O2-induced stress, SA-β-gal senescence assay, apoptosis assays, p16/Rb pathway analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple phenotypic readouts in single lab; pathway placement via p16/Rb; no reconstitution","pmids":["20664062"],"is_preprint":false},{"year":2017,"finding":"ARHGAP18 localizes to microtubules in endothelial cells (confirmed by structured illumination, GSD, and TIRF microscopy and biochemical fractionation). Depletion of ARHGAP18 (siRNA or knockout mouse ECs) destabilizes microtubules (reduced acetylated α-tubulin and glu-tubulin), impairs endothelin-1 secretion, and reduces neutrophil transmigration; this destabilization is rescued by ROCK or HDAC6 inhibition but not by a GAP-mutant ARHGAP18. Thrombin enhances the plasma membrane-bound fraction of ARHGAP18.","method":"SIM, GSD, TIRF microscopy, biochemical fractionation, siRNA, ARHGAP18-knockout mouse ECs, ROCK/HDAC6 inhibitors, GAP-mutant rescue experiments","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple super-resolution imaging methods plus biochemical confirmation, knockout mouse validation, GAP-mutant structure-function dissection; single lab with multiple orthogonal methods","pmids":["28251925"],"is_preprint":false},{"year":2017,"finding":"miR-200b directly controls ARHGAP18 levels in triple-negative breast cancer cells; enforced miR-200b expression reduces ARHGAP18, activates RhoA, enhances focal adhesions/stress fibers, and reduces migration and metastasis. Enforced ARHGAP18 re-expression where miR-200b is stably expressed reduces RhoA activity and rescues migration. ROCK inhibition reverses miR-200b's anti-migratory effect.","method":"miR-200b stable expression, ARHGAP18 deletion/overexpression, RhoA activity assays, ROCK inhibitor, in vivo metastasis assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistatic rescue experiments (ARHGAP18 OE rescues miR-200b), ROCK inhibitor phenocopy, in vivo metastasis; multiple orthogonal methods","pmids":["28619708"],"is_preprint":false},{"year":2017,"finding":"ARHGAP18 depletion in mesenchymal stem cells increases basal RhoA activity and actin stress fiber formation, suppresses adipogenesis, and enhances osteogenic commitment. ARHGAP18 provides tonic RhoA inhibition in static conditions but is not required for mechanical strain-mediated RhoA activation (which depends on LARG GEF).","method":"siRNA knockdown, RhoA activity assays, Oil-Red-O staining, alkaline phosphatase staining, qPCR of lineage markers","journal":"Bone","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined lineage phenotype and RhoA activity measurement; pathway placement vs. LARG; single lab","pmids":["29208526"],"is_preprint":false},{"year":2017,"finding":"ARHGAP18 protects against thoracic aortic aneurysm: Arhgap18-/- mice show a synthetic, proteolytic, and proinflammatory smooth muscle cell phenotype. ChIP studies revealed enrichment of H3K4me3 and depletion of H3K27me3 at MMP2 and TNF-α promoters in Arhgap18-deficient SMCs. TAA formation in Arhgap18-/- mice is associated with loss of Akt activation, and rapamycin (mTORC1 inhibitor) partially rescues the phenotype.","method":"Global Arhgap18 knockout mice, angiotensin II challenge, chromatin immunoprecipitation (ChIP), Western blotting for pAkt, rapamycin rescue","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockout with defined phenotype and ChIP-based epigenetic mechanism; pathway placement via Akt/mTORC1; single lab","pmids":["28701309"],"is_preprint":false},{"year":2019,"finding":"ARHGAP18 is required for endothelial cell alignment in the direction of laminar flow. Depletion of ARHGAP18 inhibits flow-induced alignment, disrupts junctions, activates NF-κB, and increases ICAM-1 while decreasing eNOS. ApoE-/-/Arhgap18-/- double-knockout mice on high-fat diet develop early atherosclerosis in normally atheroprotective regions.","method":"siRNA depletion, in vitro laminar flow, double-knockout mouse atherosclerosis model, NF-κB/ICAM-1/eNOS protein analysis","journal":"Journal of the American Heart Association","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo double-knockout model with defined lesion phenotype plus in vitro mechanistic data; single lab","pmids":["30630384"],"is_preprint":false},{"year":2020,"finding":"YAP is downstream of ARHGAP18 in endothelial cells: ARHGAP18 depletion decreases YAP expression yet causes its nuclear localization (activation), disrupts VE-Cadherin at junctions, and impairs flow-mediated alignment. ARHGAP18 overexpression upregulates YAP, promotes its phosphorylation, and decreases the YAP target Cyr61. YAP depletion itself also causes loss of alignment and NF-κB activation.","method":"siRNA knockdown, ARHGAP18 overexpression, confocal imaging of YAP nuclear localization, ARHGAP18-knockout mouse in vivo analysis, Cyr61/NF-κB target gene measurements","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway epistasis established in vitro and validated in vivo in knockout mice; multiple readouts; single lab","pmids":["32013974"],"is_preprint":false},{"year":2020,"finding":"PKN3 phosphorylates ARHGAP18 in vitro; PKN3-ARHGAP18 interaction is mediated via the N-terminal part of ARHGAP18 and is enhanced by ARHGAP18 phosphorylation. Phosphorylation by PKN3 enhances ARHGAP18's GAP domain activity, contributing to negative regulation of active RhoA.","method":"Phosphoproteomic screen with analog-sensitive PKN3, in vitro kinase assay, Co-immunoprecipitation, GAP domain activity assay","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay plus Co-IP plus GAP activity assay; multiple orthogonal methods; single lab","pmids":["33092266"],"is_preprint":false},{"year":2018,"finding":"IP3R3 silencing decreases ARHGAP18 expression, reduces RhoA activity, decreases Cdc42 expression, and reduces FAK Y861 phosphorylation in breast cancer cells, placing ARHGAP18 in an IP3R3/ARHGAP18/RhoA/mDia1/FAK pathway that coordinates cytoskeletal remodeling and cell morphology.","method":"siRNA knockdown of IP3R3, Western blot, RhoA activity assay, immunofluorescence","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pathway placement via knockdown with protein-level readouts; multiple markers measured; single lab","pmids":["29630900"],"is_preprint":false},{"year":2024,"finding":"ARHGAP18 is localized by binding active (phosphorylated) microvillar ezrin, and this interaction enhances ARHGAP18's RhoGAP activity. Loss of ARHGAP18 disrupts the boundary between microvilli and the terminal web, causing aberrant assembly of myosin-2 filaments inside microvilli, indicating that the ezrin-ARHGAP18 module acts as a negative autoregulatory feedback to locally reduce RhoA activity in microvilli.","method":"Localization studies in epithelial cells, Co-IP of ARHGAP18 with active ezrin, GAP activity assays, ARHGAP18 loss-of-function with myosin-2 filament distribution readout","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — interaction validated by Co-IP, GAP activity enhancement confirmed in vitro, loss-of-function with specific actin-structural phenotype; multiple orthogonal methods in single rigorous study","pmids":["38193818"],"is_preprint":false},{"year":2023,"finding":"Transcription factor GATA1 binds the ARHGAP18 promoter and drives ARHGAP18 expression in hepatocellular carcinoma cells, as confirmed by luciferase reporter assay and ChIP-qPCR. GATA1 overexpression rescues the anti-proliferative effects of ARHGAP18 silencing.","method":"Luciferase reporter assay, ChIP-qPCR, GATA1 overexpression rescue, gain/loss-of-function assays","journal":"Applied biochemistry and biotechnology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding confirmed by ChIP-qPCR and reporter assay with epistatic rescue; single lab","pmids":["37171759"],"is_preprint":false},{"year":2021,"finding":"ATG16L1 knockdown (impaired autophagy) causes accumulation of SQSTM1/p62 and ARHGAP18 protein, leading to decreased RhoA activity and reduced epithelial cell migration. Thiopurines mitigate this effect. ARHGAP18 protein accumulation in autophagy-impaired cells places ARHGAP18 as a substrate of the autophagic degradation machinery upstream of RhoA.","method":"ATG16L1/ATG5 siRNA knockdown, pharmacological autophagy inhibition, SQSTM1 knockdown, G-LISA RhoA activity, immunofluorescence, primary colonic tissue staining","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistatic knockdown series with multiple orthogonal readouts; validated in cell lines, organoids, and primary tissue; single lab","pmids":["33973626"],"is_preprint":false},{"year":2025,"finding":"ARHGAP18 forms a complex with Hippo pathway components YAP and Merlin (NF2) in human epithelial cells. CRISPR/Cas9 knockout of ARHGAP18 causes cytoskeletal alterations (loss of basal actin bundles) driven by both dysregulated RhoA signaling and aberrant nuclear localization of YAP, indicating spatiotemporal coordination between Rho GTPase and Hippo signaling at the cytoskeleton.","method":"Co-immunoprecipitation (ARHGAP18 with YAP and Merlin), CRISPR/Cas9 knockout, super-resolution STORM microscopy, YAP nuclear localization assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — Co-IP of complex with two Hippo components, CRISPR knockout with super-resolution structural phenotype; multiple orthogonal methods; single lab","pmids":["42126958"],"is_preprint":false},{"year":2025,"finding":"ERK inhibits Ezrin activity in the cell body by phosphorylating the C-terminal tail of the Ezrin-activating kinase LOK, thereby releasing Ezrin's ability to recruit and activate ARHGAP18. This ERK-LOK-Ezrin-ARHGAP18-RhoA signaling axis controls RhoA activity and contractile stress fiber assembly for cell migration.","method":"Phosphorylation mapping, LOK kinase assay, Ezrin activity measurements, ARHGAP18 recruitment assay, stress fiber and RhoA activity readouts","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — preprint with defined phosphorylation-dependent mechanism and pathway epistasis; single lab; not yet peer-reviewed","pmids":["bio_10.1101_2025.11.15.688645"],"is_preprint":true}],"current_model":"ARHGAP18 is a RhoGAP that primarily inactivates RhoA (and in specific vascular contexts, RhoC) by stimulating GTP hydrolysis; it is recruited to distinct subcellular compartments—leading edge, cell cortex, microtubules, and microvillar ezrin—where it locally fine-tunes RhoA activity to control actin cytoskeletal organization, stress fiber assembly, microvilli/terminal-web boundaries, cell migration and polarity, endothelial junctional stability and flow alignment, and mesenchymal stem cell lineage commitment; its GAP activity is enhanced by phosphorylation via PKN3 and by binding active ezrin, and it operates within a broader signaling network that includes YAP/Hippo and Merlin, p16/Rb senescence pathways, and the ERK-LOK-Ezrin axis upstream."},"narrative":{"mechanistic_narrative":"ARHGAP18 (also called MacGAP or SENEX) is a Rho GTPase-activating protein that locally restrains RhoA activity to govern actin cytoskeletal organization, cell polarity and migration [PMID:21865595]. It stimulates GTP hydrolysis on RhoA, so that its overexpression suppresses stress fibers and its loss drives sustained RhoA activation, stress fiber accumulation and cell rounding, while the protein itself concentrates at the leading edge to enable polarized spreading and migration [PMID:21865595]; in the vascular endothelium it acts selectively on RhoC to restrain tip-cell behavior and stabilize junctions during angiogenesis [PMID:25425145]. Its activity is gated by recruitment to discrete subcellular sites and by post-translational input: binding to active (phosphorylated) ezrin/Moesin recruits ARHGAP18 to the cell cortex and microvilli and enhances its GAP activity, forming a negative-feedback module that defines the microvilli/terminal-web boundary and limits myosin-2 assembly [PMID:23468526, PMID:38193818], and phosphorylation by PKN3 likewise augments GAP-domain activity [PMID:33092266]. Through this RhoA control ARHGAP18 maintains endothelial junctional integrity, NF-κB restraint and alignment under laminar flow, coordinating with the Hippo effector YAP and with Merlin, with which it forms a complex at the cytoskeleton [PMID:30630384, PMID:32013974, PMID:42126958]. It also tunes cell-fate and proliferative decisions, providing tonic RhoA inhibition that biases mesenchymal stem cells toward adipogenesis over osteogenesis [PMID:29208526], and its abundance is set by transcriptional (GATA1), microRNA (miR-200b) and autophagic-degradation inputs [PMID:37171759, PMID:28619708, PMID:33973626]. Loss-of-function in mice produces a proinflammatory smooth-muscle phenotype predisposing to thoracic aortic aneurysm and early atherosclerosis, underscoring its protective vascular role [PMID:28701309, PMID:30630384].","teleology":[{"year":2010,"claim":"Established the first functional context for the gene (SENEX) by linking it to endothelial stress responses and survival before its enzymatic identity was clear.","evidence":"siRNA depletion with H2O2 stress, senescence and apoptosis assays, p16/Rb pathway analysis in endothelial cells","pmids":["20664062"],"confidence":"Medium","gaps":["No GAP activity or RhoA link established at this stage","Mechanism connecting SENEX to p16/Rb not resolved","Single lab, no reconstitution"]},{"year":2011,"claim":"Defined ARHGAP18 as a bona fide RhoA-inactivating GAP that controls stress fibers, polarity and migration, answering what the protein does biochemically.","evidence":"Reciprocal siRNA/overexpression with RhoA activity assays, stress fiber imaging, leading-edge localization and migration assays","pmids":["21865595"],"confidence":"High","gaps":["Mechanism of leading-edge recruitment unknown","Selectivity among Rho isoforms not yet tested","Upstream regulators undefined"]},{"year":2013,"claim":"Identified ERM-protein binding (Moesin) as the means by which the GAP is recruited to the cortex, connecting localization to function.","evidence":"Co-IP, cortical localization rescue, GAP-domain mutagenesis and proliferation assays in Drosophila Conundrum orthologue","pmids":["23468526"],"confidence":"High","gaps":["Conservation of the ERM-recruitment mechanism in mammals not yet shown","Rac-dependence of growth effect mechanistically unclear"]},{"year":2014,"claim":"Showed isoform-selective substrate use, with endogenous ARHGAP18 acting on RhoC to restrain angiogenic sprouting in vivo.","evidence":"Zebrafish/mouse retinal vessel loss-of-function, RhoC-specific activity assays, ROCK-dependent junctional relocalization","pmids":["25425145"],"confidence":"High","gaps":["Basis for RhoC vs RhoA selectivity unresolved","Direct mechanism linking GAP activity to Dll4/Flk-1/Flt-4 not established"]},{"year":2017,"claim":"Expanded localization and regulation: ARHGAP18 stabilizes microtubules via GAP activity, is controlled by miR-200b in cancer, and provides tonic RhoA inhibition that directs MSC lineage choice.","evidence":"Super-resolution imaging plus knockout-EC microtubule analysis; miR-200b stable expression with metastasis assays; MSC differentiation and RhoA assays","pmids":["28251925","28619708","29208526"],"confidence":"High","gaps":["How GAP activity feeds into microtubule acetylation mechanistically unclear","Direct miR-200b targeting versus indirect effects partially resolved","Lineage phenotypes single-lab"]},{"year":2017,"claim":"Demonstrated an in vivo protective vascular role, linking ARHGAP18 loss to aneurysm-prone smooth muscle phenotypes and epigenetic dysregulation.","evidence":"Global Arhgap18 knockout mice with angiotensin II challenge, ChIP at MMP2/TNF-α promoters, pAkt analysis and rapamycin rescue","pmids":["28701309"],"confidence":"Medium","gaps":["Connection between GAP activity and chromatin marks not mechanistically explained","Akt/mTORC1 link correlative"]},{"year":2018,"claim":"Placed ARHGAP18 within an IP3R3-driven cytoskeletal signaling cascade in breast cancer cells.","evidence":"IP3R3 siRNA knockdown with RhoA activity, FAK phosphorylation and morphology readouts","pmids":["29630900"],"confidence":"Medium","gaps":["Directness of IP3R3-to-ARHGAP18 regulation untested","Single-lab pathway placement"]},{"year":2019,"claim":"Connected ARHGAP18 to mechanotransduction, showing it is required for endothelial alignment to laminar flow and protection from atherosclerosis.","evidence":"siRNA with in vitro laminar flow; ApoE/Arhgap18 double-knockout atherosclerosis model; NF-κB/ICAM-1/eNOS readouts","pmids":["30630384"],"confidence":"Medium","gaps":["Mechanism coupling flow sensing to ARHGAP18 activity unresolved","Single-lab in vivo model"]},{"year":2020,"claim":"Linked Rho GTPase control to Hippo signaling (YAP) and identified PKN3 as an activating kinase, defining upstream and downstream nodes.","evidence":"ARHGAP18 gain/loss with YAP localization and Cyr61 measurements in ECs; phosphoproteomic/in vitro kinase and GAP assays with PKN3","pmids":["32013974","33092266"],"confidence":"Medium","gaps":["Direction of YAP regulation (expression vs localization) partially paradoxical","PKN3 phosphosites and their in vivo relevance not mapped"]},{"year":2021,"claim":"Identified autophagic degradation as a route controlling ARHGAP18 abundance and downstream RhoA-dependent migration.","evidence":"ATG16L1/ATG5 and SQSTM1 knockdown, G-LISA RhoA activity, organoid and primary colonic tissue analysis","pmids":["33973626"],"confidence":"Medium","gaps":["Whether ARHGAP18 is a direct autophagy substrate not established","Recognition/adaptor mechanism unknown"]},{"year":2023,"claim":"Established GATA1 as a direct transcriptional driver of ARHGAP18 in hepatocellular carcinoma.","evidence":"Luciferase reporter, ChIP-qPCR and GATA1 overexpression rescue of ARHGAP18-silencing phenotypes","pmids":["37171759"],"confidence":"Medium","gaps":["Generality beyond HCC untested","Downstream RhoA link in this context not measured"]},{"year":2024,"claim":"Resolved the recruitment-and-activation logic at microvilli: active ezrin both localizes ARHGAP18 and boosts its GAP activity to define the microvilli/terminal-web boundary.","evidence":"Co-IP with active ezrin, in vitro GAP activity enhancement, loss-of-function with myosin-2 filament distribution readout in epithelial cells","pmids":["38193818"],"confidence":"High","gaps":["Structural basis of ezrin-mediated GAP enhancement undefined","How feedback is set spatially within a microvillus unclear"]},{"year":2025,"claim":"Showed ARHGAP18 physically integrates Rho and Hippo signaling by complexing with YAP and Merlin to organize the actin cytoskeleton.","evidence":"Co-IP of ARHGAP18 with YAP and Merlin, CRISPR knockout, STORM imaging and YAP localization in epithelial cells","pmids":["42126958"],"confidence":"High","gaps":["Stoichiometry and architecture of the complex unknown","Whether complex formation depends on GAP activity untested"]},{"year":2025,"claim":"Positioned ARHGAP18 as the effector terminus of an ERK-LOK-Ezrin axis linking MAPK signaling to RhoA-dependent contractility.","evidence":"Phosphorylation mapping, LOK kinase and ezrin activity assays, ARHGAP18 recruitment and stress fiber readouts (preprint)","pmids":["bio_10.1101_2025.11.15.688645"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","In vivo relevance of the ERK-LOK-Ezrin-ARHGAP18 axis untested"]},{"year":null,"claim":"It remains unresolved how ARHGAP18 achieves context-dependent selectivity between RhoA and RhoC and how its multiple recruitment cues (ezrin, microtubules, junctions, leading edge) are coordinated within a single cell.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of GAP-substrate selectivity","No unified scheme integrating the distinct localization signals","No structure of the ezrin- or PKN3-activated state"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2,10,12]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,4,12]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,9,15]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,6]}],"complexes":[],"partners":["EZR","MSN","PKN3","YAP1","NF2","RHOA","RHOC","LOK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N392","full_name":"Rho GTPase-activating protein 18","aliases":["MacGAP","Rho-type GTPase-activating protein 18"],"length_aa":663,"mass_kda":75.0,"function":"Rho GTPase activating protein that suppresses F-actin polymerization by inhibiting Rho. Rho GTPase activating proteins act by converting Rho-type GTPases to an inactive GDP-bound state (PubMed:21865595). Plays a key role in tissue tension and 3D tissue shape by regulating cortical actomyosin network formation. Acts downstream of YAP1 and inhibits actin polymerization, which in turn reduces nuclear localization of YAP1 (PubMed:25778702). Regulates cell shape, spreading, and migration (PubMed:21865595)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q8N392/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ARHGAP18","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"TFRC","stoichiometry":0.2},{"gene":"BAG4","stoichiometry":0.2},{"gene":"HIP1","stoichiometry":0.2},{"gene":"GAK","stoichiometry":0.2},{"gene":"EPS15","stoichiometry":0.2},{"gene":"CLTA","stoichiometry":0.2},{"gene":"DDX6","stoichiometry":0.2},{"gene":"CLTB","stoichiometry":0.2},{"gene":"GOLGA2","stoichiometry":0.2},{"gene":"SEC16A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ARHGAP18","total_profiled":1310},"omim":[{"mim_id":"613351","title":"RHO GTPase-ACTIVATING PROTEIN 18; ARHGAP18","url":"https://www.omim.org/entry/613351"},{"mim_id":"606608","title":"YES1-ASSOCIATED TRANSCRIPTIONAL REGULATOR; YAP1","url":"https://www.omim.org/entry/606608"},{"mim_id":"309845","title":"MOESIN; MSN","url":"https://www.omim.org/entry/309845"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Nuclear speckles","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ARHGAP18"},"hgnc":{"alias_symbol":["MacGAP","bA307O14.2","SENEX"],"prev_symbol":[]},"alphafold":{"accession":"Q8N392","domains":[{"cath_id":"1.10.555.10","chopping":"327-525","consensus_level":"high","plddt":91.1139,"start":327,"end":525},{"cath_id":"3.10.20.90","chopping":"577-663","consensus_level":"medium","plddt":86.3891,"start":577,"end":663}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N392","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N392-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N392-F1-predicted_aligned_error_v6.png","plddt_mean":74.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ARHGAP18","jax_strain_url":"https://www.jax.org/strain/search?query=ARHGAP18"},"sequence":{"accession":"Q8N392","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N392.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N392/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N392"}},"corpus_meta":[{"pmid":"21865595","id":"PMC_21865595","title":"ARHGAP18, a GTPase-activating protein for RhoA, controls cell shape, spreading, and motility.","date":"2011","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/21865595","citation_count":89,"is_preprint":false},{"pmid":"28619708","id":"PMC_28619708","title":"ARHGAP18 Downregulation by miR-200b Suppresses Metastasis of Triple-Negative Breast Cancer by Enhancing Activation of RhoA.","date":"2017","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/28619708","citation_count":73,"is_preprint":false},{"pmid":"28701309","id":"PMC_28701309","title":"ARHGAP18 Protects Against Thoracic Aortic Aneurysm Formation by Mitigating the Synthetic and Proinflammatory Smooth Muscle Cell Phenotype.","date":"2017","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/28701309","citation_count":51,"is_preprint":false},{"pmid":"20664062","id":"PMC_20664062","title":"Stress-induced premature senescence mediated by a novel gene, SENEX, results in an anti-inflammatory phenotype in endothelial cells.","date":"2010","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/20664062","citation_count":50,"is_preprint":false},{"pmid":"23468526","id":"PMC_23468526","title":"Conundrum, an ARHGAP18 orthologue, regulates RhoA and proliferation through interactions with Moesin.","date":"2013","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/23468526","citation_count":35,"is_preprint":false},{"pmid":"38343199","id":"PMC_38343199","title":"Bioinspired Selenium-Nitrogen Exchange (SeNEx) Click Chemistry Suitable for Nanomole-Scale Medicinal Chemistry and Bioconjugation.","date":"2024","source":"Angewandte Chemie (International ed. in English)","url":"https://pubmed.ncbi.nlm.nih.gov/38343199","citation_count":35,"is_preprint":false},{"pmid":"25425145","id":"PMC_25425145","title":"ARHGAP18: an endogenous inhibitor of angiogenesis, limiting tip formation and stabilizing junctions.","date":"2014","source":"Small GTPases","url":"https://pubmed.ncbi.nlm.nih.gov/25425145","citation_count":35,"is_preprint":false},{"pmid":"29208526","id":"PMC_29208526","title":"LARG GEF and ARHGAP18 orchestrate RhoA activity to control mesenchymal stem cell lineage.","date":"2017","source":"Bone","url":"https://pubmed.ncbi.nlm.nih.gov/29208526","citation_count":27,"is_preprint":false},{"pmid":"29630900","id":"PMC_29630900","title":"IP3R3 silencing induced actin cytoskeletal reorganization through ARHGAP18/RhoA/mDia1/FAK pathway in breast cancer cell lines.","date":"2018","source":"Biochimica et biophysica acta. 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ARHGAP18 localizes to the leading edge during cell spreading and migration and is required for cell polarization.\",\n      \"method\": \"siRNA knockdown, overexpression, immunofluorescence, RhoA activity assays, cell spreading/migration assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain/loss-of-function with multiple orthogonal readouts (RhoA activity, stress fibers, localization, migration); foundational mechanistic paper replicated by subsequent studies\",\n      \"pmids\": [\"21865595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The Drosophila ARHGAP18 orthologue Conundrum (Conu) interacts with Moesin (ERM protein), which recruits Conu to the cell cortex to negatively regulate RhoA activity. Cortically localized Conu promotes cell proliferation in a RhoGAP activity-dependent manner, and this growth-promoting function also appears dependent on increased Rac activity.\",\n      \"method\": \"Co-immunoprecipitation, genetic epistasis, cortical localization assays, RhoA activity assays, cell proliferation assays in Drosophila\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction, cortical localization rescue, GAP-domain mutagenesis functional requirement; ortholog study with multiple orthogonal methods\",\n      \"pmids\": [\"23468526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ARHGAP18 acts as a negative regulator of angiogenesis: loss of ARHGAP18 promotes endothelial cell hypersprouting in zebrafish and murine retinal vessel development. Endogenous ARHGAP18 acts specifically on RhoC (not other Rho isoforms) and relocalizes to angiogenic/destabilized EC junctions in a ROCK-dependent manner, suppressing tip cell behavior and stabilizing junctions at least partially through regulation of Dll4, Flk-1, and Flt-4.\",\n      \"method\": \"Zebrafish knockdown, murine retinal vessel analysis, siRNA in endothelial cells, ROCK inhibitor treatment, immunofluorescence localization, RhoC-specific activity assays\",\n      \"journal\": \"Small GTPases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo (zebrafish + mouse) and in vitro loss-of-function with multiple orthogonal readouts; RhoC specificity established; replicated in two species\",\n      \"pmids\": [\"25425145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SENEX (ARHGAP18) regulates stress-induced premature senescence (SIPS) in endothelial cells through the p16(INK4a)/retinoblastoma protein pathway; depletion by siRNA or high-dose H2O2 causes apoptosis, establishing SENEX as essential for EC survival. SENEX levels are regulated by H2O2-mediated stress but unchanged during replicative senescence.\",\n      \"method\": \"siRNA knockdown, H2O2-induced stress, SA-β-gal senescence assay, apoptosis assays, p16/Rb pathway analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple phenotypic readouts in single lab; pathway placement via p16/Rb; no reconstitution\",\n      \"pmids\": [\"20664062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ARHGAP18 localizes to microtubules in endothelial cells (confirmed by structured illumination, GSD, and TIRF microscopy and biochemical fractionation). Depletion of ARHGAP18 (siRNA or knockout mouse ECs) destabilizes microtubules (reduced acetylated α-tubulin and glu-tubulin), impairs endothelin-1 secretion, and reduces neutrophil transmigration; this destabilization is rescued by ROCK or HDAC6 inhibition but not by a GAP-mutant ARHGAP18. Thrombin enhances the plasma membrane-bound fraction of ARHGAP18.\",\n      \"method\": \"SIM, GSD, TIRF microscopy, biochemical fractionation, siRNA, ARHGAP18-knockout mouse ECs, ROCK/HDAC6 inhibitors, GAP-mutant rescue experiments\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple super-resolution imaging methods plus biochemical confirmation, knockout mouse validation, GAP-mutant structure-function dissection; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"28251925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"miR-200b directly controls ARHGAP18 levels in triple-negative breast cancer cells; enforced miR-200b expression reduces ARHGAP18, activates RhoA, enhances focal adhesions/stress fibers, and reduces migration and metastasis. Enforced ARHGAP18 re-expression where miR-200b is stably expressed reduces RhoA activity and rescues migration. ROCK inhibition reverses miR-200b's anti-migratory effect.\",\n      \"method\": \"miR-200b stable expression, ARHGAP18 deletion/overexpression, RhoA activity assays, ROCK inhibitor, in vivo metastasis assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistatic rescue experiments (ARHGAP18 OE rescues miR-200b), ROCK inhibitor phenocopy, in vivo metastasis; multiple orthogonal methods\",\n      \"pmids\": [\"28619708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ARHGAP18 depletion in mesenchymal stem cells increases basal RhoA activity and actin stress fiber formation, suppresses adipogenesis, and enhances osteogenic commitment. ARHGAP18 provides tonic RhoA inhibition in static conditions but is not required for mechanical strain-mediated RhoA activation (which depends on LARG GEF).\",\n      \"method\": \"siRNA knockdown, RhoA activity assays, Oil-Red-O staining, alkaline phosphatase staining, qPCR of lineage markers\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined lineage phenotype and RhoA activity measurement; pathway placement vs. LARG; single lab\",\n      \"pmids\": [\"29208526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ARHGAP18 protects against thoracic aortic aneurysm: Arhgap18-/- mice show a synthetic, proteolytic, and proinflammatory smooth muscle cell phenotype. ChIP studies revealed enrichment of H3K4me3 and depletion of H3K27me3 at MMP2 and TNF-α promoters in Arhgap18-deficient SMCs. TAA formation in Arhgap18-/- mice is associated with loss of Akt activation, and rapamycin (mTORC1 inhibitor) partially rescues the phenotype.\",\n      \"method\": \"Global Arhgap18 knockout mice, angiotensin II challenge, chromatin immunoprecipitation (ChIP), Western blotting for pAkt, rapamycin rescue\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout with defined phenotype and ChIP-based epigenetic mechanism; pathway placement via Akt/mTORC1; single lab\",\n      \"pmids\": [\"28701309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ARHGAP18 is required for endothelial cell alignment in the direction of laminar flow. Depletion of ARHGAP18 inhibits flow-induced alignment, disrupts junctions, activates NF-κB, and increases ICAM-1 while decreasing eNOS. ApoE-/-/Arhgap18-/- double-knockout mice on high-fat diet develop early atherosclerosis in normally atheroprotective regions.\",\n      \"method\": \"siRNA depletion, in vitro laminar flow, double-knockout mouse atherosclerosis model, NF-κB/ICAM-1/eNOS protein analysis\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo double-knockout model with defined lesion phenotype plus in vitro mechanistic data; single lab\",\n      \"pmids\": [\"30630384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"YAP is downstream of ARHGAP18 in endothelial cells: ARHGAP18 depletion decreases YAP expression yet causes its nuclear localization (activation), disrupts VE-Cadherin at junctions, and impairs flow-mediated alignment. ARHGAP18 overexpression upregulates YAP, promotes its phosphorylation, and decreases the YAP target Cyr61. YAP depletion itself also causes loss of alignment and NF-κB activation.\",\n      \"method\": \"siRNA knockdown, ARHGAP18 overexpression, confocal imaging of YAP nuclear localization, ARHGAP18-knockout mouse in vivo analysis, Cyr61/NF-κB target gene measurements\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway epistasis established in vitro and validated in vivo in knockout mice; multiple readouts; single lab\",\n      \"pmids\": [\"32013974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PKN3 phosphorylates ARHGAP18 in vitro; PKN3-ARHGAP18 interaction is mediated via the N-terminal part of ARHGAP18 and is enhanced by ARHGAP18 phosphorylation. Phosphorylation by PKN3 enhances ARHGAP18's GAP domain activity, contributing to negative regulation of active RhoA.\",\n      \"method\": \"Phosphoproteomic screen with analog-sensitive PKN3, in vitro kinase assay, Co-immunoprecipitation, GAP domain activity assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay plus Co-IP plus GAP activity assay; multiple orthogonal methods; single lab\",\n      \"pmids\": [\"33092266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IP3R3 silencing decreases ARHGAP18 expression, reduces RhoA activity, decreases Cdc42 expression, and reduces FAK Y861 phosphorylation in breast cancer cells, placing ARHGAP18 in an IP3R3/ARHGAP18/RhoA/mDia1/FAK pathway that coordinates cytoskeletal remodeling and cell morphology.\",\n      \"method\": \"siRNA knockdown of IP3R3, Western blot, RhoA activity assay, immunofluorescence\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pathway placement via knockdown with protein-level readouts; multiple markers measured; single lab\",\n      \"pmids\": [\"29630900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ARHGAP18 is localized by binding active (phosphorylated) microvillar ezrin, and this interaction enhances ARHGAP18's RhoGAP activity. Loss of ARHGAP18 disrupts the boundary between microvilli and the terminal web, causing aberrant assembly of myosin-2 filaments inside microvilli, indicating that the ezrin-ARHGAP18 module acts as a negative autoregulatory feedback to locally reduce RhoA activity in microvilli.\",\n      \"method\": \"Localization studies in epithelial cells, Co-IP of ARHGAP18 with active ezrin, GAP activity assays, ARHGAP18 loss-of-function with myosin-2 filament distribution readout\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — interaction validated by Co-IP, GAP activity enhancement confirmed in vitro, loss-of-function with specific actin-structural phenotype; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"38193818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Transcription factor GATA1 binds the ARHGAP18 promoter and drives ARHGAP18 expression in hepatocellular carcinoma cells, as confirmed by luciferase reporter assay and ChIP-qPCR. GATA1 overexpression rescues the anti-proliferative effects of ARHGAP18 silencing.\",\n      \"method\": \"Luciferase reporter assay, ChIP-qPCR, GATA1 overexpression rescue, gain/loss-of-function assays\",\n      \"journal\": \"Applied biochemistry and biotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding confirmed by ChIP-qPCR and reporter assay with epistatic rescue; single lab\",\n      \"pmids\": [\"37171759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ATG16L1 knockdown (impaired autophagy) causes accumulation of SQSTM1/p62 and ARHGAP18 protein, leading to decreased RhoA activity and reduced epithelial cell migration. Thiopurines mitigate this effect. ARHGAP18 protein accumulation in autophagy-impaired cells places ARHGAP18 as a substrate of the autophagic degradation machinery upstream of RhoA.\",\n      \"method\": \"ATG16L1/ATG5 siRNA knockdown, pharmacological autophagy inhibition, SQSTM1 knockdown, G-LISA RhoA activity, immunofluorescence, primary colonic tissue staining\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic knockdown series with multiple orthogonal readouts; validated in cell lines, organoids, and primary tissue; single lab\",\n      \"pmids\": [\"33973626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ARHGAP18 forms a complex with Hippo pathway components YAP and Merlin (NF2) in human epithelial cells. CRISPR/Cas9 knockout of ARHGAP18 causes cytoskeletal alterations (loss of basal actin bundles) driven by both dysregulated RhoA signaling and aberrant nuclear localization of YAP, indicating spatiotemporal coordination between Rho GTPase and Hippo signaling at the cytoskeleton.\",\n      \"method\": \"Co-immunoprecipitation (ARHGAP18 with YAP and Merlin), CRISPR/Cas9 knockout, super-resolution STORM microscopy, YAP nuclear localization assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — Co-IP of complex with two Hippo components, CRISPR knockout with super-resolution structural phenotype; multiple orthogonal methods; single lab\",\n      \"pmids\": [\"42126958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ERK inhibits Ezrin activity in the cell body by phosphorylating the C-terminal tail of the Ezrin-activating kinase LOK, thereby releasing Ezrin's ability to recruit and activate ARHGAP18. This ERK-LOK-Ezrin-ARHGAP18-RhoA signaling axis controls RhoA activity and contractile stress fiber assembly for cell migration.\",\n      \"method\": \"Phosphorylation mapping, LOK kinase assay, Ezrin activity measurements, ARHGAP18 recruitment assay, stress fiber and RhoA activity readouts\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — preprint with defined phosphorylation-dependent mechanism and pathway epistasis; single lab; not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.11.15.688645\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"ARHGAP18 is a RhoGAP that primarily inactivates RhoA (and in specific vascular contexts, RhoC) by stimulating GTP hydrolysis; it is recruited to distinct subcellular compartments—leading edge, cell cortex, microtubules, and microvillar ezrin—where it locally fine-tunes RhoA activity to control actin cytoskeletal organization, stress fiber assembly, microvilli/terminal-web boundaries, cell migration and polarity, endothelial junctional stability and flow alignment, and mesenchymal stem cell lineage commitment; its GAP activity is enhanced by phosphorylation via PKN3 and by binding active ezrin, and it operates within a broader signaling network that includes YAP/Hippo and Merlin, p16/Rb senescence pathways, and the ERK-LOK-Ezrin axis upstream.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ARHGAP18 (also called MacGAP or SENEX) is a Rho GTPase-activating protein that locally restrains RhoA activity to govern actin cytoskeletal organization, cell polarity and migration [#0]. It stimulates GTP hydrolysis on RhoA, so that its overexpression suppresses stress fibers and its loss drives sustained RhoA activation, stress fiber accumulation and cell rounding, while the protein itself concentrates at the leading edge to enable polarized spreading and migration [#0]; in the vascular endothelium it acts selectively on RhoC to restrain tip-cell behavior and stabilize junctions during angiogenesis [#2]. Its activity is gated by recruitment to discrete subcellular sites and by post-translational input: binding to active (phosphorylated) ezrin/Moesin recruits ARHGAP18 to the cell cortex and microvilli and enhances its GAP activity, forming a negative-feedback module that defines the microvilli/terminal-web boundary and limits myosin-2 assembly [#1, #12], and phosphorylation by PKN3 likewise augments GAP-domain activity [#10]. Through this RhoA control ARHGAP18 maintains endothelial junctional integrity, NF-\\u03baB restraint and alignment under laminar flow, coordinating with the Hippo effector YAP and with Merlin, with which it forms a complex at the cytoskeleton [#8, #9, #15]. It also tunes cell-fate and proliferative decisions, providing tonic RhoA inhibition that biases mesenchymal stem cells toward adipogenesis over osteogenesis [#6], and its abundance is set by transcriptional (GATA1), microRNA (miR-200b) and autophagic-degradation inputs [#13, #5, #14]. Loss-of-function in mice produces a proinflammatory smooth-muscle phenotype predisposing to thoracic aortic aneurysm and early atherosclerosis, underscoring its protective vascular role [#7, #8].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Established the first functional context for the gene (SENEX) by linking it to endothelial stress responses and survival before its enzymatic identity was clear.\",\n      \"evidence\": \"siRNA depletion with H2O2 stress, senescence and apoptosis assays, p16/Rb pathway analysis in endothelial cells\",\n      \"pmids\": [\"20664062\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No GAP activity or RhoA link established at this stage\", \"Mechanism connecting SENEX to p16/Rb not resolved\", \"Single lab, no reconstitution\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined ARHGAP18 as a bona fide RhoA-inactivating GAP that controls stress fibers, polarity and migration, answering what the protein does biochemically.\",\n      \"evidence\": \"Reciprocal siRNA/overexpression with RhoA activity assays, stress fiber imaging, leading-edge localization and migration assays\",\n      \"pmids\": [\"21865595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of leading-edge recruitment unknown\", \"Selectivity among Rho isoforms not yet tested\", \"Upstream regulators undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified ERM-protein binding (Moesin) as the means by which the GAP is recruited to the cortex, connecting localization to function.\",\n      \"evidence\": \"Co-IP, cortical localization rescue, GAP-domain mutagenesis and proliferation assays in Drosophila Conundrum orthologue\",\n      \"pmids\": [\"23468526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conservation of the ERM-recruitment mechanism in mammals not yet shown\", \"Rac-dependence of growth effect mechanistically unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed isoform-selective substrate use, with endogenous ARHGAP18 acting on RhoC to restrain angiogenic sprouting in vivo.\",\n      \"evidence\": \"Zebrafish/mouse retinal vessel loss-of-function, RhoC-specific activity assays, ROCK-dependent junctional relocalization\",\n      \"pmids\": [\"25425145\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis for RhoC vs RhoA selectivity unresolved\", \"Direct mechanism linking GAP activity to Dll4/Flk-1/Flt-4 not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Expanded localization and regulation: ARHGAP18 stabilizes microtubules via GAP activity, is controlled by miR-200b in cancer, and provides tonic RhoA inhibition that directs MSC lineage choice.\",\n      \"evidence\": \"Super-resolution imaging plus knockout-EC microtubule analysis; miR-200b stable expression with metastasis assays; MSC differentiation and RhoA assays\",\n      \"pmids\": [\"28251925\", \"28619708\", \"29208526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GAP activity feeds into microtubule acetylation mechanistically unclear\", \"Direct miR-200b targeting versus indirect effects partially resolved\", \"Lineage phenotypes single-lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated an in vivo protective vascular role, linking ARHGAP18 loss to aneurysm-prone smooth muscle phenotypes and epigenetic dysregulation.\",\n      \"evidence\": \"Global Arhgap18 knockout mice with angiotensin II challenge, ChIP at MMP2/TNF-\\u03b1 promoters, pAkt analysis and rapamycin rescue\",\n      \"pmids\": [\"28701309\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Connection between GAP activity and chromatin marks not mechanistically explained\", \"Akt/mTORC1 link correlative\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed ARHGAP18 within an IP3R3-driven cytoskeletal signaling cascade in breast cancer cells.\",\n      \"evidence\": \"IP3R3 siRNA knockdown with RhoA activity, FAK phosphorylation and morphology readouts\",\n      \"pmids\": [\"29630900\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Directness of IP3R3-to-ARHGAP18 regulation untested\", \"Single-lab pathway placement\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected ARHGAP18 to mechanotransduction, showing it is required for endothelial alignment to laminar flow and protection from atherosclerosis.\",\n      \"evidence\": \"siRNA with in vitro laminar flow; ApoE/Arhgap18 double-knockout atherosclerosis model; NF-\\u03baB/ICAM-1/eNOS readouts\",\n      \"pmids\": [\"30630384\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling flow sensing to ARHGAP18 activity unresolved\", \"Single-lab in vivo model\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked Rho GTPase control to Hippo signaling (YAP) and identified PKN3 as an activating kinase, defining upstream and downstream nodes.\",\n      \"evidence\": \"ARHGAP18 gain/loss with YAP localization and Cyr61 measurements in ECs; phosphoproteomic/in vitro kinase and GAP assays with PKN3\",\n      \"pmids\": [\"32013974\", \"33092266\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direction of YAP regulation (expression vs localization) partially paradoxical\", \"PKN3 phosphosites and their in vivo relevance not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified autophagic degradation as a route controlling ARHGAP18 abundance and downstream RhoA-dependent migration.\",\n      \"evidence\": \"ATG16L1/ATG5 and SQSTM1 knockdown, G-LISA RhoA activity, organoid and primary colonic tissue analysis\",\n      \"pmids\": [\"33973626\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ARHGAP18 is a direct autophagy substrate not established\", \"Recognition/adaptor mechanism unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established GATA1 as a direct transcriptional driver of ARHGAP18 in hepatocellular carcinoma.\",\n      \"evidence\": \"Luciferase reporter, ChIP-qPCR and GATA1 overexpression rescue of ARHGAP18-silencing phenotypes\",\n      \"pmids\": [\"37171759\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality beyond HCC untested\", \"Downstream RhoA link in this context not measured\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the recruitment-and-activation logic at microvilli: active ezrin both localizes ARHGAP18 and boosts its GAP activity to define the microvilli/terminal-web boundary.\",\n      \"evidence\": \"Co-IP with active ezrin, in vitro GAP activity enhancement, loss-of-function with myosin-2 filament distribution readout in epithelial cells\",\n      \"pmids\": [\"38193818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ezrin-mediated GAP enhancement undefined\", \"How feedback is set spatially within a microvillus unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed ARHGAP18 physically integrates Rho and Hippo signaling by complexing with YAP and Merlin to organize the actin cytoskeleton.\",\n      \"evidence\": \"Co-IP of ARHGAP18 with YAP and Merlin, CRISPR knockout, STORM imaging and YAP localization in epithelial cells\",\n      \"pmids\": [\"42126958\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and architecture of the complex unknown\", \"Whether complex formation depends on GAP activity untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Positioned ARHGAP18 as the effector terminus of an ERK-LOK-Ezrin axis linking MAPK signaling to RhoA-dependent contractility.\",\n      \"evidence\": \"Phosphorylation mapping, LOK kinase and ezrin activity assays, ARHGAP18 recruitment and stress fiber readouts (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.11.15.688645\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"In vivo relevance of the ERK-LOK-Ezrin-ARHGAP18 axis untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how ARHGAP18 achieves context-dependent selectivity between RhoA and RhoC and how its multiple recruitment cues (ezrin, microtubules, junctions, leading edge) are coordinated within a single cell.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of GAP-substrate selectivity\", \"No unified scheme integrating the distinct localization signals\", \"No structure of the ezrin- or PKN3-activated state\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2, 10, 12]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 4, 12]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 9, 15]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"EZR\", \"MSN\", \"PKN3\", \"YAP1\", \"NF2\", \"RHOA\", \"RHOC\", \"LOK\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}