{"gene":"ARHGAP5","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":1995,"finding":"p190-B (ARHGAP5) was cloned and shown to contain an N-terminal GTPase domain and a C-terminal Rho GAP domain. A recombinant Rho GAP domain polypeptide demonstrated GAP activity for RhoA, Rac1, and CDC42Hs in vitro. p190-B localizes diffusely in the cytoplasm and in fibrillar patterns co-localizing with the α5β1 integrin receptor for fibronectin. Adhesion of fibronectin-coated latex beads recruited significant amounts of p190-B and Rho to the plasma membrane beneath the bead binding site, establishing an integrin-dependent membrane recruitment mechanism.","method":"Recombinant protein GAP activity assay (in vitro), immunoprecipitation, immunofluorescence, fibronectin bead adhesion assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro GAP activity reconstitution with defined substrates, complemented by multiple orthogonal localization methods (immunofluorescence, bead adhesion assay)","pmids":["8537347"],"is_preprint":false},{"year":1998,"finding":"The mouse p190-B (Arhgap5/Gfi2) gene encodes a protein with ~97% amino acid identity to human p190-B, with a domain architecture comprising an N-terminal GTPase domain, a middle domain of unknown function, and a C-terminal Rho GAP domain distributed across multiple exons. The gene maps to mouse chromosome 12, syntenic with the human 14q locus.","method":"cDNA cloning, genomic sequencing, Northern blot, multilocus genetic cross mapping","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genomic organization and domain architecture defined by sequencing; species synteny confirmed by genetic mapping; no functional assay in this paper","pmids":["9838117"],"is_preprint":false},{"year":2000,"finding":"Transient transfection of a p190-B expression construct into MCF-10A human mammary epithelial cells disrupted the actin cytoskeleton, indicating that p190-B modulates Rho-regulated signaling pathways that influence cell migration and invasion.","method":"Transient transfection, actin cytoskeleton staining (immunofluorescence)","journal":"Cell growth & differentiation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — overexpression with defined morphological readout in a single cell line, supported by in situ hybridization expression data","pmids":["10939588"],"is_preprint":false},{"year":2003,"finding":"p190-B haploinsufficiency in mice caused decreased ductal outgrowth due to reduced proliferation in cap cells of terminal end buds, phenocopying IGF-I receptor null mammary epithelium. p190-B-deficient epithelial transplants failed to produce outgrowths in cleared fat pads, confirming a cell-autonomous role. Decreased expression of IRS-1 and IRS-2 was observed in TEBs of p190-B heterozygous mice, placing p190-B upstream of IGF signaling.","method":"p190-B knockout/heterozygous mouse model, mammary transplantation, proliferation assays, Western blot for IRS-1/2","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function in vivo with defined cellular phenotype, transplantation rescue experiment, and molecular pathway (IRS-1/2) identified","pmids":["12637587"],"is_preprint":false},{"year":2006,"finding":"Tetracycline-inducible overexpression of p190-B in the developing mammary gland caused abnormal terminal end buds with aberrant budding, thickened stroma, increased branching, delayed ductal elongation, and hyperplastic lesions during pregnancy. Overexpression altered IGF pathway signaling and caused discontinuous myoepithelial cell layer and macrophage infiltration, demonstrating that precise control of p190-B activity is required for normal branching morphogenesis.","method":"Inducible transgenic mouse overexpression, histology, immunostaining, signaling analysis","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function in vivo with multiple orthogonal phenotypic readouts and molecular correlates; complements loss-of-function data from a separate study","pmids":["16469769"],"is_preprint":false},{"year":2007,"finding":"p190-B-deficient embryos displayed defects in embryonic mammary bud development (smaller buds, fewer cells, impaired mesenchymal proliferation). These phenotypes overlapped with IRS-1/2 double knockout embryos, placing p190-B upstream of IGF-IRS signaling in epithelial-mesenchymal interactions required for mammary bud morphogenesis.","method":"p190-B knockout mouse model, IRS-1/2 double knockout, IGF-1R knockout, embryonic mammary bud analysis, proliferation assays","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis using multiple knockout models with defined phenotypic readouts, establishing pathway position","pmids":["17662267"],"is_preprint":false},{"year":2008,"finding":"ARHGAP5 (p190-B RhoGAP) is amplified at chromosomal region 14q12 in hepatocellular carcinoma cells. p190-B promotes cell spreading and migration by negatively regulating RhoA activity in Huh-7 hepatocellular carcinoma cells.","method":"High-density oligonucleotide microarray (copy number), RhoA activity assay, cell spreading and migration assays, RNAi knockdown","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RhoA activity assay directly measures GAP function in cells, combined with functional migration/spreading readouts; single lab","pmids":["18996642"],"is_preprint":false},{"year":2009,"finding":"Loss of p190-B RhoGAP in hematopoietic stem cells (HSCs) enhanced long-term engraftment during serial transplantation and maintained functional HSC-enriched cells. p190-B deficiency repressed upregulation of p16(Ink4a) in HSCs during transplantation, providing a mechanism for p190-B-mediated control of HSC self-renewal.","method":"p190-B knockout mouse, serial bone marrow transplantation, ex vivo culture, transcriptional analysis (p16Ink4a)","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo loss-of-function with serial transplantation, defined molecular mechanism (p16Ink4a repression), multiple functional readouts","pmids":["19713466"],"is_preprint":false},{"year":2013,"finding":"p190-B deletion in mice causes hematopoietic failure during ontogeny in a non-cell-autonomous manner. p190-B-/- mesenchymal stem cells (MSCs) are dysfunctional in supporting hematopoiesis due to impaired Wnt signaling, and p190-B loss alters MSC lineage fate specification to osteoblast and adipocyte lineages, disrupting the functional bone marrow niche.","method":"p190-B knockout mouse, MSC/bone marrow co-culture, Wnt signaling assay, colony-forming unit assays (CFU-F, CFU-adipocyte, CFU-osteoblast)","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple complementary functional assays, co-culture experiments, and Wnt signaling pathway placement in a defined knockout model","pmids":["23563238"],"is_preprint":false},{"year":2013,"finding":"miR-486-5p directly binds to the 3'-UTR of ARHGAP5 mRNA (validated by luciferase assay), reducing ARHGAP5 expression and thereby inhibiting lung cancer cell migration and invasion. Reduced ARHGAP5 expression phenocopied miR-486-5p overexpression.","method":"Luciferase reporter assay, qRT-PCR, Western blot, migration/invasion assays, in vivo metastasis model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR targeting validated by luciferase assay, functional rescue experiment, in vivo confirmation; single lab","pmids":["23474761"],"is_preprint":false},{"year":2015,"finding":"miR-744 directly interacts with the ARHGAP5 promoter and transcriptionally upregulates ARHGAP5 expression (rather than the typical miRNA mechanism of mRNA degradation). Reintroduction of ARHGAP5 mimicked miR-744-enhanced migration and invasion in NPC cells, while silencing ARHGAP5 abrogated miR-744-induced effects.","method":"Promoter luciferase assay, qRT-PCR, Western blot, migration/invasion assays, gain/loss-of-function","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter targeting validated by luciferase assay, functional rescue/abrogation experiments; single lab, non-canonical miRNA mechanism","pmids":["25961434"],"is_preprint":false},{"year":2016,"finding":"CD147 promotes hepatocellular carcinoma cell motility by upregulating p190-B RhoGAP at both mRNA and protein levels, leading to RhoA deactivation, reduced stress fiber and focal adhesion formation. Silencing p190-B blunted CD147's effect on cell movement, placing p190-B downstream of CD147 in a motility pathway.","method":"Wound-healing assay, RhoA biosensor (FRET-based), qRT-PCR, Western blot, immunofluorescence, siRNA knockdown","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RhoA biosensor directly measures GTPase activity in live cells; epistasis by siRNA knockdown; single lab","pmids":["27601938"],"is_preprint":false},{"year":2017,"finding":"A point mutation in p190B RhoGAP (ARHGAP5) in a patient with fatal systemic capillary leak syndrome impairs RhoB inactivation in dermal microvascular endothelial cells. TNF transiently activates RhoB in ECs coincident with barrier leak, and p190B is required for RhoB inactivation and barrier recovery. siRNA knockdown of p190B in normal ECs replicated the patient-derived EC phenotype of impaired barrier recovery.","method":"Patient-derived endothelial cell culture, siRNA knockdown, transendothelial electrical resistance (TEER), permeability assay, RhoB activity measurement","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — human mutation validated by siRNA phenocopy in normal cells, direct RhoB activity measurement, and defined barrier function readout; mechanistically rigorous","pmids":["29097442"],"is_preprint":false},{"year":2017,"finding":"Loss of p190-B RhoGAP in HSPCs normalizes TGF-β1 levels and p38MAPK activity. p190-B loss promotes symmetric retention of multi-lineage capacity in single HSPCs, linking p190-B-RhoGTPase activity to a non-canonical TGF-β–p38MAPK signaling network that controls HSPC fate choice and self-renewal.","method":"p190-B knockout mouse, HSPC transplantation, single-cell culture, TGF-β1 ELISA, p38MAPK activity assay, asymmetric division analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (single-cell assays, signaling pathway measurements, in vivo transplantation), replicated across multiple experimental systems","pmids":["28176763"],"is_preprint":false},{"year":2018,"finding":"SIRT1 suppresses ARHGAP5 expression by physically associating with transcription factor c-JUN and deacetylating and inhibiting c-JUN's transcriptional activity, reducing ARHGAP5 promoter-driven transcription. ARHGAP5 knockdown inhibited GC cell migration and invasion, and ARHGAP5 was found to be in the SIRT1-mediated inhibition pathway.","method":"mRNA microarray, Co-immunoprecipitation (SIRT1-c-JUN interaction), deacetylation assay, ChIP, migration/invasion assays, in vivo metastasis model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and deacetylation assay establish mechanism; functional epistasis by ARHGAP5 knockdown rescue; single lab","pmids":["30250020"],"is_preprint":false},{"year":2019,"finding":"ANGPTL4 promotes blood-brain barrier disruption via the ARHGAP5/RhoA/MYL5 signaling cascade in brain microvascular endothelial cells infected with meningitic E. coli. ARHGAP5 acts as an intermediate between ANGPTL4 and RhoA activation, with downstream MYL5 negatively regulating barrier function.","method":"siRNA knockdown, recombinant ANGPTL4 treatment, permeability assay in vitro and in vivo, Western blot, RhoA activity assay","journal":"Pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RhoA activity assay and functional permeability measurements with pathway epistasis; single lab","pmids":["31766605"],"is_preprint":false},{"year":2020,"finding":"ARHGAP5 promotes colorectal cancer epithelial-mesenchymal transition by negatively regulating RhoA activity. CREB1 transcriptionally upregulates ARHGAP5 expression (established by ChIP), and decreased miR-137 contributes to ARHGAP5 mRNA stability. ARHGAP5 suppression reduces CRC cell metastasis in vitro and in xenograft models.","method":"ChIP assay, RNAi, RhoA activity assay, EMT markers, RNA-Seq, xenograft models, Western blot","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishes direct transcriptional regulation by CREB1; RhoA activity assay confirms GAP function; in vivo xenograft; single lab","pmids":["32483433"],"is_preprint":false},{"year":2022,"finding":"ADAR1 interacts with METTL3 and edits METTL3 mRNA to change its miR-532-5p binding site, leading to increased METTL3 protein, which then targets ARHGAP5 mRNA for m6A modification recognized by YTHDF1, promoting ARHGAP5 expression and breast cancer progression.","method":"Co-IP (ADAR1-METTL3), RNA editing sequencing, m6A-RIP, miRNA luciferase assay, in vivo tumor growth, knockdown/overexpression","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus m6A-RIP establish mechanistic chain; multiple orthogonal methods; single lab; ARHGAP5 role specifically as m6A target confirmed","pmids":["36077054"],"is_preprint":false},{"year":2022,"finding":"ARHGAP5 promotes ovarian cancer epithelial-mesenchymal transition by regulating Rho GTPase activities. The lncRNA ZFHX2-AS1 interacts with and attenuates DKC1 pseudouridine synthase activity, thereby reducing pseudouridylation of ARHGAP5 mRNA and decreasing its stability. Re-expression of ARHGAP5 partially reversed the tumor-suppressive effects of ZFHX2-AS1.","method":"RNA pulldown, DKC1 enzymatic activity assay, pseudouridylation assay, in vitro and in vivo functional assays, ARHGAP5 rescue experiments, Rho GTPase activity assays","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — enzymatic activity assay for DKC1 pseudouridylation, RNA pulldown interaction, and functional rescue; single lab","pmids":["39368791"],"is_preprint":false},{"year":2022,"finding":"miR-486-5p directly targets the 3'-UTR of ARHGAP5 mRNA (validated by luciferase reporter assay in HTR8/SVneo trophoblast cells), reducing ARHGAP5 expression and suppressing trophoblast cell migration and invasion. ARHGAP5 siRNA knockdown phenocopied miR-486-5p overexpression.","method":"Luciferase reporter assay (ARHGAP5 3'-UTR), RT-qPCR, Western blot, wound healing assay, invasion assay, siRNA","journal":"Placenta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR targeting confirmed by luciferase assay, functional phenocopy by siRNA; independent replication of miR-486-5p/ARHGAP5 mechanism in different cell type","pmids":["35477045"],"is_preprint":false},{"year":2022,"finding":"ARHGAP5 missense variants in the RhoGAP domain identified in IHH patients; arhgap5 zebrafish mutants did not display significant GnRH3-GFP+ neuronal area abnormalities, providing a negative result for a developmental role of ARHGAP5 orthologs in GnRH neuronal development in zebrafish.","method":"Exome sequencing, in vitro GAP activity assay (for ARHGAP35 variant), zebrafish gnrh3:egfp modeling","journal":"Genetics in medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — zebrafish arhgap5 mutant gave negative result (no GnRH phenotype); GAP activity assay was performed for ARHGAP35 variant, not ARHGAP5; limited mechanistic conclusion for ARHGAP5","pmids":["36178483"],"is_preprint":false},{"year":2024,"finding":"DEC1 directly regulates ARHGAP5 transcription in extravillous trophoblasts (EVTs); DEC1 inhibits trophoblast invasion by directly regulating ARHGAP5 transcription. BaA suppresses DEC1 (by promoting abnormal methylation), leading to altered ARHGAP5 expression and impaired trophoblast invasion.","method":"RNA-seq, ChIP (DEC1 on ARHGAP5 promoter), siRNA knockdown, overexpression, mouse miscarriage model","journal":"Journal of hazardous materials","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishes direct transcriptional regulation of ARHGAP5 by DEC1; functional invasion assays and in vivo mouse model; single lab","pmids":["39191013"],"is_preprint":false},{"year":2025,"finding":"CRISPR/Cas9 knockout of p190B (ARHGAP5) in endometrial cancer cells causes actin remodeling with formation of Cross-Linked Actin Networks (CLANs) dependent on the Rho/ROCK pathway, phenocopying p190A (ARHGAP35) knockout. Double knockout of both p190A and p190B is synthetically lethal in endometrial cancer cells, revealing functional redundancy and a synthetic lethal vulnerability.","method":"CRISPR/Cas9 knockout, actin cytoskeleton imaging, ROCK inhibitor treatment, proteomic analysis, synthetic lethality assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR knockout with defined actin phenotype and Rho/ROCK pathway dependence; synthetic lethality confirmed by double-KO; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2025.10.16.682927"],"is_preprint":true},{"year":2025,"finding":"N-cadherin maintains hepatic polarity by facilitating RhoA inactivation through the p120-catenin family member ARVCF and its partner p190B/ARHGAP5. This places p190B downstream of N-cadherin/ARVCF and upstream of RhoA in the control of bile canaliculi formation.","method":"Live imaging, FRAP, genetic rescue, RhoA activity assay, co-immunoprecipitation (ARVCF-p190B interaction)","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishes ARVCF-p190B interaction; RhoA activity assay confirms functional output; pathway epistasis established; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2025.10.06.680681"],"is_preprint":true}],"current_model":"ARHGAP5 (p190-B RhoGAP) is a dual-domain protein with an N-terminal GTPase domain and a C-terminal Rho GAP domain that directly inactivates RhoA, Rac1, and CDC42 in vitro; it is recruited to the plasma membrane downstream of integrin engagement and N-cadherin/ARVCF signaling, where it suppresses RhoA activity to regulate actin cytoskeleton organization, cell migration/invasion, mammary ductal morphogenesis (through crosstalk with IGF-IRS signaling), hematopoietic stem cell self-renewal (via a p190-B–ROS–TGF-β–p38MAPK network), and endothelial barrier function (through RhoB inactivation); its expression is transcriptionally controlled by CREB1 and c-JUN (deacetylated by SIRT1), post-transcriptionally regulated by multiple miRNAs targeting its 3'-UTR, and its mRNA is subject to m6A modification by METTL3 and pseudouridylation by DKC1, with loss of p190-B activity linked to diseases ranging from systemic capillary leak syndrome to cancer metastasis."},"narrative":{"mechanistic_narrative":"ARHGAP5 (p190-B RhoGAP) is a Rho-family GTPase-activating protein that inactivates RhoA, Rac1, and CDC42 to govern actin cytoskeleton organization, cell migration/invasion, and tissue morphogenesis [PMID:8537347, PMID:10939588]. The protein comprises an N-terminal GTPase domain and a C-terminal Rho GAP domain, the latter conferring GAP activity toward RhoA, Rac1, and CDC42 in vitro; it is recruited to the plasma membrane beneath sites of integrin (α5β1) engagement with fibronectin, coupling adhesion signaling to local Rho regulation [PMID:8537347]. Across multiple cell types ARHGAP5 acts as the effector that deactivates RhoA downstream of upstream receptors—including CD147 in hepatocellular carcinoma [PMID:27601938], ANGPTL4 in brain endothelium [PMID:31766605], and N-cadherin/ARVCF in hepatocytes [PMID:bio_10.1101_2025.10.06.680681]—to control cell spreading, motility, and epithelial-mesenchymal transition [PMID:18996642, PMID:32483433]. In vivo, p190-B operates upstream of IGF-IRS signaling to drive mammary ductal and embryonic bud morphogenesis, where both loss and overexpression disrupt terminal end bud development [PMID:12637587, PMID:16469769, PMID:17662267], and it restrains hematopoietic stem cell self-renewal through a TGF-β–p38MAPK–p16(Ink4a) network and supports the bone marrow niche via mesenchymal Wnt signaling [PMID:19713466, PMID:23563238, PMID:28176763]. In endothelium, p190-B is required for RhoB inactivation and barrier recovery; a patient point mutation impairing this function underlies fatal systemic capillary leak syndrome [PMID:29097442]. ARHGAP5 expression is transcriptionally activated by CREB1 [PMID:32483433], c-JUN (repressed by SIRT1-mediated deacetylation) [PMID:30250020], and DEC1 [PMID:39191013], and is post-transcriptionally tuned by miR-486-5p targeting its 3'-UTR [PMID:23474761, PMID:35477045], by m6A modification via METTL3/YTHDF1 [PMID:36077054], and by DKC1-dependent pseudouridylation [PMID:39368791]. p190-B is functionally redundant with the paralog p190-A (ARHGAP35), and their double knockout is synthetically lethal in endometrial cancer cells [PMID:bio_10.1101_2025.10.16.682927].","teleology":[{"year":1995,"claim":"Established that ARHGAP5 is a bifunctional GTPase/Rho-GAP protein with intrinsic GAP activity and that adhesion couples it to membrane Rho regulation, defining its core biochemical identity.","evidence":"Recombinant GAP activity assay on RhoA/Rac1/CDC42, immunofluorescence, and fibronectin bead adhesion in fibroblasts","pmids":["8537347"],"confidence":"High","gaps":["Function of the N-terminal GTPase domain and middle domain not resolved","Which GTPase is the physiological substrate in cells not established here"]},{"year":1998,"claim":"Defined the gene's exon structure, domain architecture, and cross-species conservation, enabling mouse genetic study of p190-B.","evidence":"cDNA/genomic sequencing and genetic cross mapping of mouse Arhgap5","pmids":["9838117"],"confidence":"Medium","gaps":["No functional assay performed","Role of the uncharacterized middle domain unknown"]},{"year":2000,"claim":"Connected p190-B activity to actin cytoskeleton remodeling in mammary epithelial cells, linking its biochemistry to cell shape and migration.","evidence":"Transient overexpression with actin staining in MCF-10A cells","pmids":["10939588"],"confidence":"Medium","gaps":["Overexpression-only readout","Specific GTPase mediating the actin phenotype not pinned down"]},{"year":2003,"claim":"Positioned p190-B upstream of IGF-IRS signaling in mammary ductal development through cell-autonomous loss-of-function genetics.","evidence":"p190-B knockout/heterozygous mice, mammary transplantation, IRS-1/2 Western blot","pmids":["12637587"],"confidence":"High","gaps":["Molecular link between RhoGAP activity and IRS expression unresolved","Whether the effect requires GAP catalytic function not tested"]},{"year":2006,"claim":"Showed that precise dosage of p190-B is required for normal branching morphogenesis, complementing loss-of-function with gain-of-function in vivo.","evidence":"Inducible transgenic overexpression, histology, IGF pathway signaling analysis","pmids":["16469769"],"confidence":"High","gaps":["Direct GTPase target driving morphogenesis defects not defined","Mechanism connecting p190-B to stromal/macrophage phenotypes unclear"]},{"year":2007,"claim":"Established genetic epistasis placing p190-B upstream of IGF-IRS in embryonic mammary bud epithelial-mesenchymal interactions.","evidence":"Multiple knockout models (p190-B, IRS-1/2, IGF-1R), embryonic bud and proliferation analysis","pmids":["17662267"],"confidence":"High","gaps":["Biochemical mechanism linking p190-B to IGF-IRS not resolved"]},{"year":2009,"claim":"Identified p190-B as a restraint on HSC self-renewal acting through p16(Ink4a), extending its role into stem cell biology.","evidence":"p190-B knockout mice, serial bone marrow transplantation, p16Ink4a transcriptional analysis","pmids":["19713466"],"confidence":"High","gaps":["Link from RhoGAP activity to p16Ink4a regulation not mechanistically defined"]},{"year":2013,"claim":"Revealed a non-cell-autonomous niche role: p190-B is required in mesenchymal stem cells for Wnt-dependent hematopoietic support and lineage fate.","evidence":"p190-B knockout mice, MSC/BM co-culture, Wnt assays, CFU lineage assays","pmids":["23563238"],"confidence":"High","gaps":["How p190-B/Rho activity intersects Wnt signaling not detailed"]},{"year":2013,"claim":"Demonstrated that p190-B negatively regulates RhoA to drive HCC cell spreading and migration, and that the gene is amplified at 14q12 in cancer.","evidence":"Copy-number microarray, RhoA activity assay, migration/spreading assays with RNAi in Huh-7 cells","pmids":["18996642"],"confidence":"Medium","gaps":["Single cell line","Upstream regulators of p190-B in HCC not addressed here"]},{"year":2017,"claim":"Showed p190-B controls HSPC fate choice and symmetric self-renewal via a non-canonical TGF-β–p38MAPK network, refining its stem cell mechanism.","evidence":"p190-B knockout mice, single-cell HSPC culture, TGF-β1 ELISA, p38MAPK activity, asymmetric division analysis","pmids":["28176763"],"confidence":"High","gaps":["Direct biochemical chain from RhoGTPase to TGF-β not established"]},{"year":2017,"claim":"Provided human genetic evidence that p190-B-mediated RhoB inactivation is required for endothelial barrier recovery, linking the gene to systemic capillary leak syndrome.","evidence":"Patient-derived endothelial cells, siRNA phenocopy, TEER/permeability assays, RhoB activity measurement","pmids":["29097442"],"confidence":"High","gaps":["How the point mutation alters GAP catalysis structurally not resolved","RhoB as substrate selectivity mechanism not defined"]},{"year":2016,"claim":"Placed p190-B downstream of CD147 in a RhoA-deactivating motility pathway in HCC.","evidence":"FRET RhoA biosensor, wound-healing, qRT-PCR/Western, siRNA epistasis","pmids":["27601938"],"confidence":"Medium","gaps":["Single lab","How CD147 upregulates p190-B transcription/protein unresolved"]},{"year":2018,"claim":"Identified the SIRT1–c-JUN axis as a transcriptional repressor of ARHGAP5, adding a layer of expression control relevant to gastric cancer invasion.","evidence":"Co-IP, deacetylation assay, ChIP, migration/invasion assays, in vivo metastasis","pmids":["30250020"],"confidence":"Medium","gaps":["Single lab","Direct c-JUN occupancy dynamics on ARHGAP5 promoter limited"]},{"year":2015,"claim":"Showed miR-744 non-canonically upregulates ARHGAP5 via promoter interaction to enhance migration/invasion, expanding post-transcriptional regulation.","evidence":"Promoter luciferase, qRT-PCR/Western, migration/invasion gain/loss in NPC cells","pmids":["25961434"],"confidence":"Medium","gaps":["Non-canonical mechanism single lab","Direct promoter binding mode not structurally defined"]},{"year":2013,"claim":"Established miR-486-5p as a direct 3'-UTR repressor of ARHGAP5 that suppresses lung cancer metastasis, later independently confirmed in trophoblasts.","evidence":"Luciferase 3'-UTR reporter, migration/invasion, in vivo metastasis (2013); replicated in HTR8/SVneo trophoblasts (2022)","pmids":["23474761","35477045"],"confidence":"Medium","gaps":["Broader miRNA regulatory network not mapped"]},{"year":2019,"claim":"Embedded ARHGAP5 in the ANGPTL4/RhoA/MYL5 cascade controlling blood-brain barrier disruption during bacterial meningitis.","evidence":"siRNA, recombinant ANGPTL4, permeability assays in vitro/in vivo, RhoA activity assay","pmids":["31766605"],"confidence":"Medium","gaps":["Single lab","How ANGPTL4 signals to ARHGAP5 not defined"]},{"year":2020,"claim":"Showed CREB1 directly drives ARHGAP5 transcription and miR-137 loss stabilizes its mRNA to promote colorectal cancer EMT and metastasis.","evidence":"ChIP, RNAi, RhoA activity assay, EMT markers, RNA-Seq, xenografts","pmids":["32483433"],"confidence":"Medium","gaps":["Single lab","Relative contribution of transcriptional vs mRNA-stability control unquantified"]},{"year":2022,"claim":"Defined an ADAR1–METTL3–m6A–YTHDF1 axis that increases ARHGAP5 expression to drive breast cancer progression, adding RNA-modification control.","evidence":"Co-IP, RNA editing-seq, m6A-RIP, miRNA luciferase, in vivo tumor growth","pmids":["36077054"],"confidence":"Medium","gaps":["Single lab","Direct functional consequence of m6A on ARHGAP5 translation/stability not separately resolved"]},{"year":2022,"claim":"Showed lncRNA ZFHX2-AS1 limits DKC1-dependent pseudouridylation of ARHGAP5 mRNA to control its stability and ovarian cancer EMT.","evidence":"RNA pulldown, DKC1 enzymatic/pseudouridylation assays, rescue, Rho GTPase activity assays","pmids":["39368791"],"confidence":"Medium","gaps":["Single lab","Specific pseudouridylated residues and their mechanistic effect not mapped"]},{"year":2022,"claim":"Tested but did not support a developmental role for ARHGAP5 orthologs in GnRH neuronal development, despite RhoGAP-domain variants in IHH patients.","evidence":"Exome sequencing and zebrafish gnrh3:egfp mutant modeling (negative result)","pmids":["36178483"],"confidence":"Low","gaps":["Negative zebrafish result; GAP assay was for paralog ARHGAP35 not ARHGAP5","Causality of ARHGAP5 variants in IHH not established"]},{"year":2024,"claim":"Identified DEC1 as a direct transcriptional regulator of ARHGAP5 controlling extravillous trophoblast invasion and linked it to environmental exposure.","evidence":"RNA-seq, ChIP on ARHGAP5 promoter, siRNA/overexpression, mouse miscarriage model","pmids":["39191013"],"confidence":"Medium","gaps":["Single lab","Downstream Rho effector in trophoblasts not fully defined"]},{"year":2025,"claim":"Demonstrated functional redundancy with the paralog p190-A and a synthetic lethal vulnerability of dual p190 loss, defined through actin/Rho-ROCK phenotypes.","evidence":"CRISPR/Cas9 knockout, actin (CLAN) imaging, ROCK inhibition, synthetic lethality assay in endometrial cancer cells (preprint)","pmids":["bio_10.1101_2025.10.16.682927"],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Molecular basis of redundancy and lethality not detailed"]},{"year":2025,"claim":"Placed p190-B downstream of N-cadherin/ARVCF in RhoA inactivation controlling hepatic polarity and bile canaliculi formation, via a direct ARVCF interaction.","evidence":"Live imaging, FRAP, genetic rescue, RhoA activity assay, ARVCF-p190B Co-IP (preprint)","pmids":["bio_10.1101_2025.10.06.680681"],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Reciprocal validation and binding interface of ARVCF-p190B not resolved"]},{"year":null,"claim":"The structural basis for p190-B's GTPase substrate selectivity (RhoA vs RhoB vs Rac1/CDC42) in different tissues and the function of its N-terminal GTPase and middle domains remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of substrate engagement in the corpus","Roles of the N-terminal GTPase and middle domains uncharacterized","How diverse upstream receptors converge on p190-B recruitment not unified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,6,11,12,16]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,6,12]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,6,11,12,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,4,5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[12,16]}],"complexes":[],"partners":["RHOA","RHOB","RAC1","CDC42","ARVCF","ITGA5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13017","full_name":"Rho GTPase-activating protein 5","aliases":["Rho-type GTPase-activating protein 5","p190-B"],"length_aa":1502,"mass_kda":172.5,"function":"GTPase-activating protein for Rho family members (PubMed:8537347)","subcellular_location":"Cytoplasm; Cell 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A recombinant Rho GAP domain polypeptide demonstrated GAP activity for RhoA, Rac1, and CDC42Hs in vitro. p190-B localizes diffusely in the cytoplasm and in fibrillar patterns co-localizing with the α5β1 integrin receptor for fibronectin. Adhesion of fibronectin-coated latex beads recruited significant amounts of p190-B and Rho to the plasma membrane beneath the bead binding site, establishing an integrin-dependent membrane recruitment mechanism.\",\n      \"method\": \"Recombinant protein GAP activity assay (in vitro), immunoprecipitation, immunofluorescence, fibronectin bead adhesion assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro GAP activity reconstitution with defined substrates, complemented by multiple orthogonal localization methods (immunofluorescence, bead adhesion assay)\",\n      \"pmids\": [\"8537347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The mouse p190-B (Arhgap5/Gfi2) gene encodes a protein with ~97% amino acid identity to human p190-B, with a domain architecture comprising an N-terminal GTPase domain, a middle domain of unknown function, and a C-terminal Rho GAP domain distributed across multiple exons. The gene maps to mouse chromosome 12, syntenic with the human 14q locus.\",\n      \"method\": \"cDNA cloning, genomic sequencing, Northern blot, multilocus genetic cross mapping\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genomic organization and domain architecture defined by sequencing; species synteny confirmed by genetic mapping; no functional assay in this paper\",\n      \"pmids\": [\"9838117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Transient transfection of a p190-B expression construct into MCF-10A human mammary epithelial cells disrupted the actin cytoskeleton, indicating that p190-B modulates Rho-regulated signaling pathways that influence cell migration and invasion.\",\n      \"method\": \"Transient transfection, actin cytoskeleton staining (immunofluorescence)\",\n      \"journal\": \"Cell growth & differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — overexpression with defined morphological readout in a single cell line, supported by in situ hybridization expression data\",\n      \"pmids\": [\"10939588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"p190-B haploinsufficiency in mice caused decreased ductal outgrowth due to reduced proliferation in cap cells of terminal end buds, phenocopying IGF-I receptor null mammary epithelium. p190-B-deficient epithelial transplants failed to produce outgrowths in cleared fat pads, confirming a cell-autonomous role. Decreased expression of IRS-1 and IRS-2 was observed in TEBs of p190-B heterozygous mice, placing p190-B upstream of IGF signaling.\",\n      \"method\": \"p190-B knockout/heterozygous mouse model, mammary transplantation, proliferation assays, Western blot for IRS-1/2\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function in vivo with defined cellular phenotype, transplantation rescue experiment, and molecular pathway (IRS-1/2) identified\",\n      \"pmids\": [\"12637587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Tetracycline-inducible overexpression of p190-B in the developing mammary gland caused abnormal terminal end buds with aberrant budding, thickened stroma, increased branching, delayed ductal elongation, and hyperplastic lesions during pregnancy. Overexpression altered IGF pathway signaling and caused discontinuous myoepithelial cell layer and macrophage infiltration, demonstrating that precise control of p190-B activity is required for normal branching morphogenesis.\",\n      \"method\": \"Inducible transgenic mouse overexpression, histology, immunostaining, signaling analysis\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function in vivo with multiple orthogonal phenotypic readouts and molecular correlates; complements loss-of-function data from a separate study\",\n      \"pmids\": [\"16469769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"p190-B-deficient embryos displayed defects in embryonic mammary bud development (smaller buds, fewer cells, impaired mesenchymal proliferation). These phenotypes overlapped with IRS-1/2 double knockout embryos, placing p190-B upstream of IGF-IRS signaling in epithelial-mesenchymal interactions required for mammary bud morphogenesis.\",\n      \"method\": \"p190-B knockout mouse model, IRS-1/2 double knockout, IGF-1R knockout, embryonic mammary bud analysis, proliferation assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis using multiple knockout models with defined phenotypic readouts, establishing pathway position\",\n      \"pmids\": [\"17662267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ARHGAP5 (p190-B RhoGAP) is amplified at chromosomal region 14q12 in hepatocellular carcinoma cells. p190-B promotes cell spreading and migration by negatively regulating RhoA activity in Huh-7 hepatocellular carcinoma cells.\",\n      \"method\": \"High-density oligonucleotide microarray (copy number), RhoA activity assay, cell spreading and migration assays, RNAi knockdown\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RhoA activity assay directly measures GAP function in cells, combined with functional migration/spreading readouts; single lab\",\n      \"pmids\": [\"18996642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Loss of p190-B RhoGAP in hematopoietic stem cells (HSCs) enhanced long-term engraftment during serial transplantation and maintained functional HSC-enriched cells. p190-B deficiency repressed upregulation of p16(Ink4a) in HSCs during transplantation, providing a mechanism for p190-B-mediated control of HSC self-renewal.\",\n      \"method\": \"p190-B knockout mouse, serial bone marrow transplantation, ex vivo culture, transcriptional analysis (p16Ink4a)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo loss-of-function with serial transplantation, defined molecular mechanism (p16Ink4a repression), multiple functional readouts\",\n      \"pmids\": [\"19713466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"p190-B deletion in mice causes hematopoietic failure during ontogeny in a non-cell-autonomous manner. p190-B-/- mesenchymal stem cells (MSCs) are dysfunctional in supporting hematopoiesis due to impaired Wnt signaling, and p190-B loss alters MSC lineage fate specification to osteoblast and adipocyte lineages, disrupting the functional bone marrow niche.\",\n      \"method\": \"p190-B knockout mouse, MSC/bone marrow co-culture, Wnt signaling assay, colony-forming unit assays (CFU-F, CFU-adipocyte, CFU-osteoblast)\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple complementary functional assays, co-culture experiments, and Wnt signaling pathway placement in a defined knockout model\",\n      \"pmids\": [\"23563238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"miR-486-5p directly binds to the 3'-UTR of ARHGAP5 mRNA (validated by luciferase assay), reducing ARHGAP5 expression and thereby inhibiting lung cancer cell migration and invasion. Reduced ARHGAP5 expression phenocopied miR-486-5p overexpression.\",\n      \"method\": \"Luciferase reporter assay, qRT-PCR, Western blot, migration/invasion assays, in vivo metastasis model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR targeting validated by luciferase assay, functional rescue experiment, in vivo confirmation; single lab\",\n      \"pmids\": [\"23474761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"miR-744 directly interacts with the ARHGAP5 promoter and transcriptionally upregulates ARHGAP5 expression (rather than the typical miRNA mechanism of mRNA degradation). Reintroduction of ARHGAP5 mimicked miR-744-enhanced migration and invasion in NPC cells, while silencing ARHGAP5 abrogated miR-744-induced effects.\",\n      \"method\": \"Promoter luciferase assay, qRT-PCR, Western blot, migration/invasion assays, gain/loss-of-function\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter targeting validated by luciferase assay, functional rescue/abrogation experiments; single lab, non-canonical miRNA mechanism\",\n      \"pmids\": [\"25961434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CD147 promotes hepatocellular carcinoma cell motility by upregulating p190-B RhoGAP at both mRNA and protein levels, leading to RhoA deactivation, reduced stress fiber and focal adhesion formation. Silencing p190-B blunted CD147's effect on cell movement, placing p190-B downstream of CD147 in a motility pathway.\",\n      \"method\": \"Wound-healing assay, RhoA biosensor (FRET-based), qRT-PCR, Western blot, immunofluorescence, siRNA knockdown\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RhoA biosensor directly measures GTPase activity in live cells; epistasis by siRNA knockdown; single lab\",\n      \"pmids\": [\"27601938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A point mutation in p190B RhoGAP (ARHGAP5) in a patient with fatal systemic capillary leak syndrome impairs RhoB inactivation in dermal microvascular endothelial cells. TNF transiently activates RhoB in ECs coincident with barrier leak, and p190B is required for RhoB inactivation and barrier recovery. siRNA knockdown of p190B in normal ECs replicated the patient-derived EC phenotype of impaired barrier recovery.\",\n      \"method\": \"Patient-derived endothelial cell culture, siRNA knockdown, transendothelial electrical resistance (TEER), permeability assay, RhoB activity measurement\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human mutation validated by siRNA phenocopy in normal cells, direct RhoB activity measurement, and defined barrier function readout; mechanistically rigorous\",\n      \"pmids\": [\"29097442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Loss of p190-B RhoGAP in HSPCs normalizes TGF-β1 levels and p38MAPK activity. p190-B loss promotes symmetric retention of multi-lineage capacity in single HSPCs, linking p190-B-RhoGTPase activity to a non-canonical TGF-β–p38MAPK signaling network that controls HSPC fate choice and self-renewal.\",\n      \"method\": \"p190-B knockout mouse, HSPC transplantation, single-cell culture, TGF-β1 ELISA, p38MAPK activity assay, asymmetric division analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (single-cell assays, signaling pathway measurements, in vivo transplantation), replicated across multiple experimental systems\",\n      \"pmids\": [\"28176763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SIRT1 suppresses ARHGAP5 expression by physically associating with transcription factor c-JUN and deacetylating and inhibiting c-JUN's transcriptional activity, reducing ARHGAP5 promoter-driven transcription. ARHGAP5 knockdown inhibited GC cell migration and invasion, and ARHGAP5 was found to be in the SIRT1-mediated inhibition pathway.\",\n      \"method\": \"mRNA microarray, Co-immunoprecipitation (SIRT1-c-JUN interaction), deacetylation assay, ChIP, migration/invasion assays, in vivo metastasis model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and deacetylation assay establish mechanism; functional epistasis by ARHGAP5 knockdown rescue; single lab\",\n      \"pmids\": [\"30250020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ANGPTL4 promotes blood-brain barrier disruption via the ARHGAP5/RhoA/MYL5 signaling cascade in brain microvascular endothelial cells infected with meningitic E. coli. ARHGAP5 acts as an intermediate between ANGPTL4 and RhoA activation, with downstream MYL5 negatively regulating barrier function.\",\n      \"method\": \"siRNA knockdown, recombinant ANGPTL4 treatment, permeability assay in vitro and in vivo, Western blot, RhoA activity assay\",\n      \"journal\": \"Pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RhoA activity assay and functional permeability measurements with pathway epistasis; single lab\",\n      \"pmids\": [\"31766605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ARHGAP5 promotes colorectal cancer epithelial-mesenchymal transition by negatively regulating RhoA activity. CREB1 transcriptionally upregulates ARHGAP5 expression (established by ChIP), and decreased miR-137 contributes to ARHGAP5 mRNA stability. ARHGAP5 suppression reduces CRC cell metastasis in vitro and in xenograft models.\",\n      \"method\": \"ChIP assay, RNAi, RhoA activity assay, EMT markers, RNA-Seq, xenograft models, Western blot\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishes direct transcriptional regulation by CREB1; RhoA activity assay confirms GAP function; in vivo xenograft; single lab\",\n      \"pmids\": [\"32483433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ADAR1 interacts with METTL3 and edits METTL3 mRNA to change its miR-532-5p binding site, leading to increased METTL3 protein, which then targets ARHGAP5 mRNA for m6A modification recognized by YTHDF1, promoting ARHGAP5 expression and breast cancer progression.\",\n      \"method\": \"Co-IP (ADAR1-METTL3), RNA editing sequencing, m6A-RIP, miRNA luciferase assay, in vivo tumor growth, knockdown/overexpression\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus m6A-RIP establish mechanistic chain; multiple orthogonal methods; single lab; ARHGAP5 role specifically as m6A target confirmed\",\n      \"pmids\": [\"36077054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ARHGAP5 promotes ovarian cancer epithelial-mesenchymal transition by regulating Rho GTPase activities. The lncRNA ZFHX2-AS1 interacts with and attenuates DKC1 pseudouridine synthase activity, thereby reducing pseudouridylation of ARHGAP5 mRNA and decreasing its stability. Re-expression of ARHGAP5 partially reversed the tumor-suppressive effects of ZFHX2-AS1.\",\n      \"method\": \"RNA pulldown, DKC1 enzymatic activity assay, pseudouridylation assay, in vitro and in vivo functional assays, ARHGAP5 rescue experiments, Rho GTPase activity assays\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzymatic activity assay for DKC1 pseudouridylation, RNA pulldown interaction, and functional rescue; single lab\",\n      \"pmids\": [\"39368791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-486-5p directly targets the 3'-UTR of ARHGAP5 mRNA (validated by luciferase reporter assay in HTR8/SVneo trophoblast cells), reducing ARHGAP5 expression and suppressing trophoblast cell migration and invasion. ARHGAP5 siRNA knockdown phenocopied miR-486-5p overexpression.\",\n      \"method\": \"Luciferase reporter assay (ARHGAP5 3'-UTR), RT-qPCR, Western blot, wound healing assay, invasion assay, siRNA\",\n      \"journal\": \"Placenta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR targeting confirmed by luciferase assay, functional phenocopy by siRNA; independent replication of miR-486-5p/ARHGAP5 mechanism in different cell type\",\n      \"pmids\": [\"35477045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ARHGAP5 missense variants in the RhoGAP domain identified in IHH patients; arhgap5 zebrafish mutants did not display significant GnRH3-GFP+ neuronal area abnormalities, providing a negative result for a developmental role of ARHGAP5 orthologs in GnRH neuronal development in zebrafish.\",\n      \"method\": \"Exome sequencing, in vitro GAP activity assay (for ARHGAP35 variant), zebrafish gnrh3:egfp modeling\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — zebrafish arhgap5 mutant gave negative result (no GnRH phenotype); GAP activity assay was performed for ARHGAP35 variant, not ARHGAP5; limited mechanistic conclusion for ARHGAP5\",\n      \"pmids\": [\"36178483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DEC1 directly regulates ARHGAP5 transcription in extravillous trophoblasts (EVTs); DEC1 inhibits trophoblast invasion by directly regulating ARHGAP5 transcription. BaA suppresses DEC1 (by promoting abnormal methylation), leading to altered ARHGAP5 expression and impaired trophoblast invasion.\",\n      \"method\": \"RNA-seq, ChIP (DEC1 on ARHGAP5 promoter), siRNA knockdown, overexpression, mouse miscarriage model\",\n      \"journal\": \"Journal of hazardous materials\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishes direct transcriptional regulation of ARHGAP5 by DEC1; functional invasion assays and in vivo mouse model; single lab\",\n      \"pmids\": [\"39191013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRISPR/Cas9 knockout of p190B (ARHGAP5) in endometrial cancer cells causes actin remodeling with formation of Cross-Linked Actin Networks (CLANs) dependent on the Rho/ROCK pathway, phenocopying p190A (ARHGAP35) knockout. Double knockout of both p190A and p190B is synthetically lethal in endometrial cancer cells, revealing functional redundancy and a synthetic lethal vulnerability.\",\n      \"method\": \"CRISPR/Cas9 knockout, actin cytoskeleton imaging, ROCK inhibitor treatment, proteomic analysis, synthetic lethality assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR knockout with defined actin phenotype and Rho/ROCK pathway dependence; synthetic lethality confirmed by double-KO; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.16.682927\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"N-cadherin maintains hepatic polarity by facilitating RhoA inactivation through the p120-catenin family member ARVCF and its partner p190B/ARHGAP5. This places p190B downstream of N-cadherin/ARVCF and upstream of RhoA in the control of bile canaliculi formation.\",\n      \"method\": \"Live imaging, FRAP, genetic rescue, RhoA activity assay, co-immunoprecipitation (ARVCF-p190B interaction)\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishes ARVCF-p190B interaction; RhoA activity assay confirms functional output; pathway epistasis established; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.06.680681\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"ARHGAP5 (p190-B RhoGAP) is a dual-domain protein with an N-terminal GTPase domain and a C-terminal Rho GAP domain that directly inactivates RhoA, Rac1, and CDC42 in vitro; it is recruited to the plasma membrane downstream of integrin engagement and N-cadherin/ARVCF signaling, where it suppresses RhoA activity to regulate actin cytoskeleton organization, cell migration/invasion, mammary ductal morphogenesis (through crosstalk with IGF-IRS signaling), hematopoietic stem cell self-renewal (via a p190-B–ROS–TGF-β–p38MAPK network), and endothelial barrier function (through RhoB inactivation); its expression is transcriptionally controlled by CREB1 and c-JUN (deacetylated by SIRT1), post-transcriptionally regulated by multiple miRNAs targeting its 3'-UTR, and its mRNA is subject to m6A modification by METTL3 and pseudouridylation by DKC1, with loss of p190-B activity linked to diseases ranging from systemic capillary leak syndrome to cancer metastasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ARHGAP5 (p190-B RhoGAP) is a Rho-family GTPase-activating protein that inactivates RhoA, Rac1, and CDC42 to govern actin cytoskeleton organization, cell migration/invasion, and tissue morphogenesis [#0, #2]. The protein comprises an N-terminal GTPase domain and a C-terminal Rho GAP domain, the latter conferring GAP activity toward RhoA, Rac1, and CDC42 in vitro; it is recruited to the plasma membrane beneath sites of integrin (\\u03b15\\u03b21) engagement with fibronectin, coupling adhesion signaling to local Rho regulation [#0]. Across multiple cell types ARHGAP5 acts as the effector that deactivates RhoA downstream of upstream receptors\\u2014including CD147 in hepatocellular carcinoma [#11], ANGPTL4 in brain endothelium [#15], and N-cadherin/ARVCF in hepatocytes [#23]\\u2014to control cell spreading, motility, and epithelial-mesenchymal transition [#6, #16]. In vivo, p190-B operates upstream of IGF-IRS signaling to drive mammary ductal and embryonic bud morphogenesis, where both loss and overexpression disrupt terminal end bud development [#3, #4, #5], and it restrains hematopoietic stem cell self-renewal through a TGF-\\u03b2\\u2013p38MAPK\\u2013p16(Ink4a) network and supports the bone marrow niche via mesenchymal Wnt signaling [#7, #8, #13]. In endothelium, p190-B is required for RhoB inactivation and barrier recovery; a patient point mutation impairing this function underlies fatal systemic capillary leak syndrome [#12]. ARHGAP5 expression is transcriptionally activated by CREB1 [#16], c-JUN (repressed by SIRT1-mediated deacetylation) [#14], and DEC1 [#21], and is post-transcriptionally tuned by miR-486-5p targeting its 3'-UTR [#9, #19], by m6A modification via METTL3/YTHDF1 [#17], and by DKC1-dependent pseudouridylation [#18]. p190-B is functionally redundant with the paralog p190-A (ARHGAP35), and their double knockout is synthetically lethal in endometrial cancer cells [#22].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that ARHGAP5 is a bifunctional GTPase/Rho-GAP protein with intrinsic GAP activity and that adhesion couples it to membrane Rho regulation, defining its core biochemical identity.\",\n      \"evidence\": \"Recombinant GAP activity assay on RhoA/Rac1/CDC42, immunofluorescence, and fibronectin bead adhesion in fibroblasts\",\n      \"pmids\": [\"8537347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of the N-terminal GTPase domain and middle domain not resolved\", \"Which GTPase is the physiological substrate in cells not established here\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined the gene's exon structure, domain architecture, and cross-species conservation, enabling mouse genetic study of p190-B.\",\n      \"evidence\": \"cDNA/genomic sequencing and genetic cross mapping of mouse Arhgap5\",\n      \"pmids\": [\"9838117\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional assay performed\", \"Role of the uncharacterized middle domain unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Connected p190-B activity to actin cytoskeleton remodeling in mammary epithelial cells, linking its biochemistry to cell shape and migration.\",\n      \"evidence\": \"Transient overexpression with actin staining in MCF-10A cells\",\n      \"pmids\": [\"10939588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression-only readout\", \"Specific GTPase mediating the actin phenotype not pinned down\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Positioned p190-B upstream of IGF-IRS signaling in mammary ductal development through cell-autonomous loss-of-function genetics.\",\n      \"evidence\": \"p190-B knockout/heterozygous mice, mammary transplantation, IRS-1/2 Western blot\",\n      \"pmids\": [\"12637587\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between RhoGAP activity and IRS expression unresolved\", \"Whether the effect requires GAP catalytic function not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed that precise dosage of p190-B is required for normal branching morphogenesis, complementing loss-of-function with gain-of-function in vivo.\",\n      \"evidence\": \"Inducible transgenic overexpression, histology, IGF pathway signaling analysis\",\n      \"pmids\": [\"16469769\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct GTPase target driving morphogenesis defects not defined\", \"Mechanism connecting p190-B to stromal/macrophage phenotypes unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established genetic epistasis placing p190-B upstream of IGF-IRS in embryonic mammary bud epithelial-mesenchymal interactions.\",\n      \"evidence\": \"Multiple knockout models (p190-B, IRS-1/2, IGF-1R), embryonic bud and proliferation analysis\",\n      \"pmids\": [\"17662267\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism linking p190-B to IGF-IRS not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified p190-B as a restraint on HSC self-renewal acting through p16(Ink4a), extending its role into stem cell biology.\",\n      \"evidence\": \"p190-B knockout mice, serial bone marrow transplantation, p16Ink4a transcriptional analysis\",\n      \"pmids\": [\"19713466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Link from RhoGAP activity to p16Ink4a regulation not mechanistically defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed a non-cell-autonomous niche role: p190-B is required in mesenchymal stem cells for Wnt-dependent hematopoietic support and lineage fate.\",\n      \"evidence\": \"p190-B knockout mice, MSC/BM co-culture, Wnt assays, CFU lineage assays\",\n      \"pmids\": [\"23563238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How p190-B/Rho activity intersects Wnt signaling not detailed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that p190-B negatively regulates RhoA to drive HCC cell spreading and migration, and that the gene is amplified at 14q12 in cancer.\",\n      \"evidence\": \"Copy-number microarray, RhoA activity assay, migration/spreading assays with RNAi in Huh-7 cells\",\n      \"pmids\": [\"18996642\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cell line\", \"Upstream regulators of p190-B in HCC not addressed here\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed p190-B controls HSPC fate choice and symmetric self-renewal via a non-canonical TGF-\\u03b2\\u2013p38MAPK network, refining its stem cell mechanism.\",\n      \"evidence\": \"p190-B knockout mice, single-cell HSPC culture, TGF-\\u03b21 ELISA, p38MAPK activity, asymmetric division analysis\",\n      \"pmids\": [\"28176763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical chain from RhoGTPase to TGF-\\u03b2 not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided human genetic evidence that p190-B-mediated RhoB inactivation is required for endothelial barrier recovery, linking the gene to systemic capillary leak syndrome.\",\n      \"evidence\": \"Patient-derived endothelial cells, siRNA phenocopy, TEER/permeability assays, RhoB activity measurement\",\n      \"pmids\": [\"29097442\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the point mutation alters GAP catalysis structurally not resolved\", \"RhoB as substrate selectivity mechanism not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed p190-B downstream of CD147 in a RhoA-deactivating motility pathway in HCC.\",\n      \"evidence\": \"FRET RhoA biosensor, wound-healing, qRT-PCR/Western, siRNA epistasis\",\n      \"pmids\": [\"27601938\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"How CD147 upregulates p190-B transcription/protein unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified the SIRT1\\u2013c-JUN axis as a transcriptional repressor of ARHGAP5, adding a layer of expression control relevant to gastric cancer invasion.\",\n      \"evidence\": \"Co-IP, deacetylation assay, ChIP, migration/invasion assays, in vivo metastasis\",\n      \"pmids\": [\"30250020\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct c-JUN occupancy dynamics on ARHGAP5 promoter limited\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed miR-744 non-canonically upregulates ARHGAP5 via promoter interaction to enhance migration/invasion, expanding post-transcriptional regulation.\",\n      \"evidence\": \"Promoter luciferase, qRT-PCR/Western, migration/invasion gain/loss in NPC cells\",\n      \"pmids\": [\"25961434\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Non-canonical mechanism single lab\", \"Direct promoter binding mode not structurally defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established miR-486-5p as a direct 3'-UTR repressor of ARHGAP5 that suppresses lung cancer metastasis, later independently confirmed in trophoblasts.\",\n      \"evidence\": \"Luciferase 3'-UTR reporter, migration/invasion, in vivo metastasis (2013); replicated in HTR8/SVneo trophoblasts (2022)\",\n      \"pmids\": [\"23474761\", \"35477045\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Broader miRNA regulatory network not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Embedded ARHGAP5 in the ANGPTL4/RhoA/MYL5 cascade controlling blood-brain barrier disruption during bacterial meningitis.\",\n      \"evidence\": \"siRNA, recombinant ANGPTL4, permeability assays in vitro/in vivo, RhoA activity assay\",\n      \"pmids\": [\"31766605\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"How ANGPTL4 signals to ARHGAP5 not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed CREB1 directly drives ARHGAP5 transcription and miR-137 loss stabilizes its mRNA to promote colorectal cancer EMT and metastasis.\",\n      \"evidence\": \"ChIP, RNAi, RhoA activity assay, EMT markers, RNA-Seq, xenografts\",\n      \"pmids\": [\"32483433\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Relative contribution of transcriptional vs mRNA-stability control unquantified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined an ADAR1\\u2013METTL3\\u2013m6A\\u2013YTHDF1 axis that increases ARHGAP5 expression to drive breast cancer progression, adding RNA-modification control.\",\n      \"evidence\": \"Co-IP, RNA editing-seq, m6A-RIP, miRNA luciferase, in vivo tumor growth\",\n      \"pmids\": [\"36077054\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct functional consequence of m6A on ARHGAP5 translation/stability not separately resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed lncRNA ZFHX2-AS1 limits DKC1-dependent pseudouridylation of ARHGAP5 mRNA to control its stability and ovarian cancer EMT.\",\n      \"evidence\": \"RNA pulldown, DKC1 enzymatic/pseudouridylation assays, rescue, Rho GTPase activity assays\",\n      \"pmids\": [\"39368791\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Specific pseudouridylated residues and their mechanistic effect not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Tested but did not support a developmental role for ARHGAP5 orthologs in GnRH neuronal development, despite RhoGAP-domain variants in IHH patients.\",\n      \"evidence\": \"Exome sequencing and zebrafish gnrh3:egfp mutant modeling (negative result)\",\n      \"pmids\": [\"36178483\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Negative zebrafish result; GAP assay was for paralog ARHGAP35 not ARHGAP5\", \"Causality of ARHGAP5 variants in IHH not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified DEC1 as a direct transcriptional regulator of ARHGAP5 controlling extravillous trophoblast invasion and linked it to environmental exposure.\",\n      \"evidence\": \"RNA-seq, ChIP on ARHGAP5 promoter, siRNA/overexpression, mouse miscarriage model\",\n      \"pmids\": [\"39191013\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Downstream Rho effector in trophoblasts not fully defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated functional redundancy with the paralog p190-A and a synthetic lethal vulnerability of dual p190 loss, defined through actin/Rho-ROCK phenotypes.\",\n      \"evidence\": \"CRISPR/Cas9 knockout, actin (CLAN) imaging, ROCK inhibition, synthetic lethality assay in endometrial cancer cells (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.10.16.682927\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Molecular basis of redundancy and lethality not detailed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed p190-B downstream of N-cadherin/ARVCF in RhoA inactivation controlling hepatic polarity and bile canaliculi formation, via a direct ARVCF interaction.\",\n      \"evidence\": \"Live imaging, FRAP, genetic rescue, RhoA activity assay, ARVCF-p190B Co-IP (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.10.06.680681\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Reciprocal validation and binding interface of ARVCF-p190B not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for p190-B's GTPase substrate selectivity (RhoA vs RhoB vs Rac1/CDC42) in different tissues and the function of its N-terminal GTPase and middle domains remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of substrate engagement in the corpus\", \"Roles of the N-terminal GTPase and middle domains uncharacterized\", \"How diverse upstream receptors converge on p190-B recruitment not unified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 6, 11, 12, 16]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 6, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 6, 11, 12, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 4, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [12, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RHOA\", \"RHOB\", \"RAC1\", \"CDC42\", \"ARVCF\", \"ITGA5\"]\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}