{"gene":"ARHGEF12","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2000,"finding":"LARG activates RhoA in vivo and functions as an integral component linking G protein-coupled receptors and heterotrimeric G proteins of the Gα12 family to Rho-dependent signaling pathways.","method":"In vivo RhoA activation assay, co-immunoprecipitation, overexpression in mammalian cells","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated across multiple subsequent studies, original findings used reciprocal biochemical approaches to establish G12-LARG-RhoA linkage","pmids":["11094164"],"is_preprint":false},{"year":2002,"finding":"LARG directly interacts with the cytoplasmic tail of Plexin-B1 and Plexin-B2 via its PDZ domain binding to a PDZ-binding motif in the Plexin-B C-terminus; this interaction is required for semaphorin-induced RhoA activation and cytoskeletal reorganization.","method":"Affinity pulldown from mouse brain, co-immunoprecipitation, PDZ domain mutagenesis, RhoA activation assay, dominant-negative experiments","journal":"The Journal of biological chemistry; Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — independently replicated by two labs (PMID 12183458 and 12196628), PDZ domain mutagenesis and interaction-defective Plexin-B1 mutant confirmed mechanism","pmids":["12183458","12196628"],"is_preprint":false},{"year":2002,"finding":"FAK tyrosine-phosphorylates LARG in response to thrombin receptor activation, enhancing RhoA activation; this constitutes a positive feedback loop for sustained Rho activation downstream of GPCRs.","method":"Tyrosine phosphorylation assays, kinase inhibitor experiments, co-immunoprecipitation, RhoA-GTP pulldown","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple biochemical methods including phosphorylation assays and RhoA activity measurements","pmids":["11799111"],"is_preprint":false},{"year":2004,"finding":"LARG forms homo- and hetero-oligomers with PDZ-RhoGEF via their C-terminal regions; deletion of the C-terminal tail increases in vivo RhoA-GEF activity and transforming potential, identifying C-terminal oligomerization as an autoinhibitory mechanism.","method":"Co-immunoprecipitation, in vitro GEF assay, serum response element reporter assay, Rho-GTP pulldown, focus formation assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple orthogonal methods (Co-IP, in vitro GEF assay, reporter assay, transformation assay)","pmids":["14712228"],"is_preprint":false},{"year":2007,"finding":"LARG is required for G12/G13-mediated MTOC polarization and microtubule dynamics; LARG associates with pericentrin and localizes to the MTOC and along microtubule tracks.","method":"Gα12/13-deficient MEFs, siRNA knockdown, confocal microscopy, co-immunoprecipitation with pericentrin","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, genetic (KO MEFs) and imaging approaches with localization data","pmids":["17959834"],"is_preprint":false},{"year":2007,"finding":"The RhoA effector Dia1 binds to LARG in a RhoA-dependent manner (releasing Dia1 autoinhibition), and the Dia1 FH2 domain stimulates LARG guanine nucleotide exchange activity in vitro, creating a positive feedback loop for RhoA activation.","method":"In vitro GEF assay, co-immunoprecipitation, autoinhibition release assay, siRNA knockdown with RhoA/ROCK signaling readout","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro GEF reconstitution assay plus binding and cellular assays in single rigorous study","pmids":["17575049"],"is_preprint":false},{"year":2007,"finding":"G12-G13-LARG signaling in vascular smooth muscle is required for salt-induced hypertension but not for basal blood pressure regulation, established using smooth muscle-specific inducible Cre/loxP deletion of LARG in mice.","method":"Smooth muscle-specific inducible LARG knockout mouse, blood pressure telemetry, salt-loading model","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional KO mouse model with defined physiological phenotype, replicated in subsequent studies","pmids":["18084302"],"is_preprint":false},{"year":2007,"finding":"LARG is activated downstream of fibronectin adhesion and, together with Lsc/p115 RhoGEF, mediates RhoA activation and formation of stress fibers and focal adhesions in response to fibronectin.","method":"Affinity pulldown for active GEFs, siRNA knockdown, actin/focal adhesion staining, RhoA-GTP pulldown","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple orthogonal methods including active GEF pulldown and functional readouts","pmids":["17971419"],"is_preprint":false},{"year":2009,"finding":"LARG associates with Unc5B coreceptor downstream of neogenin/RGMa; FAK-dependent tyrosine phosphorylation of LARG mediates RGMa-induced RhoA activation and growth cone collapse.","method":"Co-immunoprecipitation, siRNA knockdown, tyrosine phosphorylation assay, RhoA activation assay, growth cone collapse assay","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, reciprocal Co-IP plus functional rescue assays","pmids":["19273616"],"is_preprint":false},{"year":2009,"finding":"mDia1 activates the LARG/RhoA/ROCK signaling axis in neutrophil chemotaxis; mDia1-deficient neutrophils show impaired LARG and RhoA activation, polarization, and directional migration.","method":"mDia1 knockout mouse neutrophils, RhoA-GTP pulldown, ROCK activity assay, chemotaxis assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO model, multiple signaling and functional readouts in single study","pmids":["19265163"],"is_preprint":false},{"year":2009,"finding":"The LARG PH domain contains a conserved hydrophobic patch that is required for RhoA activation and stress fiber induction in cells but not for nucleotide exchange activity in vitro; this patch mediates regulatory protein interactions near the membrane rather than membrane targeting per se.","method":"PH domain mutagenesis, in vitro nucleotide exchange assay, transcriptional reporter assay, confocal microscopy, membrane-targeting domain fusion rescue","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro assay combined with mutagenesis and cellular functional assays in a single rigorous study","pmids":["19560536"],"is_preprint":false},{"year":2010,"finding":"S1P receptor 2 (S1PR2) activates RhoA in smooth muscle cells specifically through LARG (not PDZ-RhoGEF or p115), and this LARG-RhoA pathway promotes smooth muscle differentiation marker gene expression.","method":"siRNA knockdown, RhoA-GTP pulldown, smooth muscle promoter reporter assay, myocardin-related transcription factor nuclear localization, scratch wound/transwell migration assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple functional and signaling readouts with RGS-RhoGEF-specific knockdowns","pmids":["20702813"],"is_preprint":false},{"year":2011,"finding":"Application of tensional force to integrins activates LARG through the Src family kinase Fyn, recruiting LARG to adhesion complexes and increasing cellular stiffness (reinforcement); this is mechanistically distinct from GEF-H1 activation via FAK-Ras-ERK.","method":"Magnetic twisting cytometry, biochemical GEF activation assays, siRNA knockdown, co-immunoprecipitation, atomic force microscopy","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal biophysical and biochemical methods, identified Fyn as upstream activator with pathway specificity demonstrated","pmids":["21572419"],"is_preprint":false},{"year":2011,"finding":"The DH domain of LARG is specific for RhoA, RhoB, and RhoC (inactive toward Rac1, Cdc42, TC10) and exhibits the highest catalytic GEF activity reported for a Dbl protein (~10^7-fold acceleration of nucleotide exchange); the PH domain does not contribute to DH activity in LARG, and a novel N-terminal regulatory region of the DH domain mediates association with GDP-bound RhoA.","method":"In vitro kinetic nucleotide exchange assays (fluorescent RhoA reporter), comparative DH domain analysis, substrate specificity panel","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — rigorous in vitro reconstitution with kinetic measurements, replicated across multiple GEF family members in same study","pmids":["21454492"],"is_preprint":false},{"year":2011,"finding":"LARG is activated by Gαq-coupled receptors (histamine H1 receptor) through a mechanism requiring only the catalytic DH-PH tandem of LARG, independent of PLCβ activation and distinct from Gαq-mediated p63RhoGEF activation; activated Gαq physically interacts with LARG.","method":"Co-immunoprecipitation, SRF-reporter assay, dominant-active Gαq expression, siRNA knockdown, receptor-specific pharmacology","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple biochemical and reporter methods with receptor specificity controls","pmids":["22100544"],"is_preprint":false},{"year":2012,"finding":"NIS (sodium/iodide symporter) binds LARG directly; this interaction sequesters LARG at the plasma membrane, modulating RhoA activity and cell motility/invasiveness.","method":"Co-immunoprecipitation, cell migration/invasion assays, NIS subcellular localization manipulation","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP binding established; functional consequences shown with localization manipulation, but single lab","pmids":["22962269"],"is_preprint":false},{"year":2012,"finding":"Angiotensin II activates the LARG/RhoA/MYPT1 axis in vascular smooth muscle cells via the AT1 receptor; siRNA knockdown of LARG reduces Ang II-induced RhoA activity, MYPT1 phosphorylation, and aortic ring contraction.","method":"siRNA knockdown, Western blot for RhoA activity and MYPT1 phosphorylation, isometric contraction measurement","journal":"Acta pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple functional readouts with receptor-specific pharmacology","pmids":["23123644"],"is_preprint":false},{"year":2013,"finding":"Combined genetic deletion of PDZ-RhoGEF and LARG in mice causes early embryonic lethality and developmental defects; triple deletion of PDZ-RhoGEF, LARG, and p115 abolishes Gα12/13-to-Rho signaling and thrombin-induced proliferation, directional migration, and JNK/p38 activation in MEFs.","method":"Knockout mouse generation, embryonic lethality analysis, MEF signaling assays, RhoA-GTP pulldown, JNK/p38 activation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic triple KO definitively establishes LARG as required effector in Gα12/13-to-Rho pathway, replicated across multiple signaling readouts","pmids":["23467409"],"is_preprint":false},{"year":2013,"finding":"LARG localizes to the central spindle and midbody during cytokinesis and is required for abscission; LARG depletion causes persistent intercellular bridges and apoptosis without affecting furrow regression or early mitotic timing. Aurora-B inhibition rescues the delayed abscission kinetics.","method":"siRNA knockdown, live cell imaging, immunofluorescence colocalization with α-tubulin and RhoA, rescue expression, Aurora-B inhibition","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, live imaging plus rescue experiment, specific cytokinesis stage phenotype defined","pmids":["23885121"],"is_preprint":false},{"year":2013,"finding":"CYLD deubiquitinase interacts with LARG and deubiquitinates it; CYLD-mediated deubiquitination of LARG enhances its ability to stimulate GDP/GTP exchange on RhoA, thereby regulating cytoskeletal rearrangement and cell polarity.","method":"Co-immunoprecipitation, ubiquitination assay, deubiquitination assay, RhoA-GTP pulldown, cytoskeletal phenotype analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple biochemical methods establishing LARG as CYLD substrate with functional consequence","pmids":["23405219"],"is_preprint":false},{"year":2014,"finding":"LARG acts downstream of mechanically stimulated ICAM-1 clusters in endothelial cells to increase RhoA activity and cellular stiffening; LARG depletion decreases leukocyte crawling and inhibits transendothelial migration.","method":"Magnetic twisting cytometry on ICAM-1 clusters, siRNA knockdown, RhoA-GTP pulldown, leukocyte TEM assay, traction force microscopy","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, biophysical and functional assays linking LARG to mechanical signaling downstream of ICAM-1","pmids":["24585879"],"is_preprint":false},{"year":2014,"finding":"TGF-β-induced EMT causes proteasomal degradation of LARG and GEF-H1 via ALK5, leading to decreased cell stiffness, loss of stiffening response to integrin force, and increased invasion capacity.","method":"TGF-β treatment, proteasome inhibition, siRNA knockdown, magnetic twisting cytometry, Boyden chamber invasion assay, Western blot","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple orthogonal methods linking ALK5-driven LARG degradation to mechanical and invasion phenotypes","pmids":["25143398"],"is_preprint":false},{"year":2014,"finding":"Jun kinase activity drives overexpression of LARG in response to inflammatory cytokines (IL-1β, TNF-α) in longitudinal smooth muscle cells, resulting in enhanced LARG/RhoA/Rho kinase signaling and sustained hypercontraction.","method":"siRNA, JNK inhibitor (SP600125), Western blot, Rho kinase activity assay, smooth muscle contraction assay","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, JNK inhibitor and siRNA with multiple downstream signaling and functional readouts","pmids":["24740538"],"is_preprint":false},{"year":2015,"finding":"Cdk1 directly phosphorylates LARG at Ser190 and Ser1176 during mitosis; phosphonull LARG is more active than phosphomimetic LARG in RhoA activation assays, indicating Cdk1 phosphorylation suppresses LARG GEF activity during mitosis. Phosphorylated LARG localizes to mitotic organizing centers and flanking the midbody.","method":"In vitro Cdk1 kinase assay, phosphospecific antibodies, phosphonull/phosphomimetic mutants, RhoA activity assay, immunofluorescence","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with site-specific mutagenesis and functional RhoA activity readout in same study","pmids":["26483157"],"is_preprint":false},{"year":2015,"finding":"C-RGMa peptide uses a LARG/Rho/ROCK pathway to inhibit axonal growth; dominant-negative LARG (LARG-PDZ) overexpression in the developing optic tectum causes overshoots in superficial tectal layers, establishing LARG as required for C-RGMa-mediated layer targeting.","method":"Dominant-negative LARG overexpression in chick embryo tectum, in ovo electroporation, axonal projection analysis","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, in vivo dominant-negative approach with defined pathway selectivity (C-RGMa vs. N-RGMa)","pmids":["26292756"],"is_preprint":false},{"year":2017,"finding":"RSK2 directly interacts with LARG and phosphorylates LARG at Ser1288, activating RhoA/RhoB-dependent cell migration and invasion; RSK2 Thr577 phosphorylation is required for LARG-RhoA pathway activation.","method":"Co-immunoprecipitation, in vitro kinase assay, RhoA-GTP pulldown, site-directed mutagenesis, transwell migration/invasion assay","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis of both kinase and substrate, plus functional cell migration readout in single rigorous study","pmids":["29279389"],"is_preprint":false},{"year":2017,"finding":"LARG is a component of the DC-SIGN signalosome and participates in DC-SIGN-mediated HIV-1 internalization in dendritic cells; cocaine enhances DC-SIGN/LARG/LSP1 complex formation, activating LARG-RhoA and focal adhesion signaling to facilitate HIV-1 transfer.","method":"Co-immunoprecipitation, HIV-1 internalization assay, intracellular trafficking imaging, siRNA knockdown","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and functional internalization assays, single lab","pmids":["28094782"],"is_preprint":false},{"year":2017,"finding":"LARG knockdown in mesenchymal stem cells accelerates adipogenesis, reduces basal RhoA activity, and almost entirely inhibits mechanical strain-induced RhoA activation, establishing LARG as the primary mediator of force-driven RhoA activation in MSC lineage commitment.","method":"siRNA knockdown, RhoA-GTP pulldown, mechanical strain application, adipogenesis/osteogenesis assays (Oil-Red-O, ALP staining, qPCR)","journal":"Bone","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, clean KD with mechanical and biochemical readouts showing specificity of LARG for strain response","pmids":["29208526"],"is_preprint":false},{"year":2018,"finding":"Arhgef12 is required for IL17A-induced airway smooth muscle contractility and airway hyperresponsiveness; Arhgef12-KO tracheal rings show decreased contractility and RhoA activation in response to IL17A, and Arhgef12-KO mice have reduced airway hyperresponsiveness in a house dust mite model without effects on inflammation.","method":"Arhgef12-KO mouse, tracheal ring contraction assay, RhoA activation assay, in vivo allergen sensitization model, airway hyperresponsiveness measurement","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with both ex vivo contraction assay and in vivo disease model, multiple readouts","pmids":["30385725"],"is_preprint":false},{"year":2019,"finding":"G12/G13- and LARG-mediated RhoA signaling in smooth muscle cells is required for myogenic vasoconstriction; smooth muscle-specific loss of G12/G13 or ARHGEF12 abolishes pressure-induced RhoA activation and myogenic tone in small arteries, reducing systemic vascular resistance.","method":"Smooth muscle-specific conditional LARG knockout mouse, pressure myography, RhoA activity assay, intracellular Ca2+ measurement","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse with ex vivo vascular physiology and molecular readouts, replicates and extends prior KO studies","pmids":["31549965"],"is_preprint":false},{"year":2019,"finding":"ARHGEF12-RhoA signaling regulates erythroid differentiation via the p38 kinase pathway; arhgef12 knockdown/knockout in zebrafish impairs erythropoiesis, and active RhoA or p38 rescues this defect.","method":"Morpholino knockdown and CRISPR/Cas9 KO in zebrafish, p38 kinase assay, rescue with active RhoA/p38, human K562 and mouse 32D cell differentiation assays","journal":"Haematologica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple model systems (zebrafish KO, cell lines), pathway rescue experiment, single lab","pmids":["31467124"],"is_preprint":false},{"year":2022,"finding":"In tight junction-forming human dermal microvascular endothelial cells, ArhGEF12 selectively activates Rap1A (not RhoA, RhoB, RhoC, or Rap1B) in cell-free assays; ARHGEF12 depletion exacerbates TNF-induced barrier disruption by reducing GTP-bound Rap1A.","method":"siRNA knockdown, trans-endothelial electrical resistance, cell-free GEF assay with immunoprecipitated ArhGEF12, active GEF pulldown, tight junction staining","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-free biochemical assay plus functional barrier assay, single lab; unexpected finding (Rap1A activation) supported by multiple methods","pmids":["35294066"],"is_preprint":false},{"year":2023,"finding":"Arhgef12 (and Arhgef11) are enriched at transient cell protrusions and retractions, recruited to the plasma membrane by active Rac; their depletion reduces Rac-to-Rho activity crosstalk, cell protrusion-retraction dynamics, and migration distance, placing Arhgef12 as the molecular link coupling Rac activity to RhoA activation during cell migration.","method":"FRET-based Rho GTPase activity biosensors, optogenetic Rac activation, siRNA knockdown, live cell migration analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — optogenetic perturbation combined with live biosensor imaging and KD in single rigorous study","pmids":["38102112"],"is_preprint":false},{"year":2025,"finding":"RSK2 phosphorylation of LARG at S1288 promotes membrane translocation of LARG and markedly enhances assembly of the LARG-RhoA complex and GTP loading of RhoA in response to EGF; this pathway is active in glioblastoma cells.","method":"Phosphospecific antibodies, membrane fractionation, co-immunoprecipitation, RhoA-GTP pulldown, EGF stimulation, patient-derived GBM cell lines","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, extends prior RSK2-LARG study with new mechanistic detail on membrane translocation, multiple biochemical readouts","pmids":["41338458"],"is_preprint":false},{"year":2025,"finding":"ARHGEF12 E620K mutation activates Rap1 signaling, upregulates ITGA6 expression, and promotes formation of ITGA6-high exosomes that educate ovarian fibroblasts toward cancer-associated fibroblast phenotypes, facilitating pre-metastatic niche formation.","method":"Ectopic expression of E620K mutant, in vitro migration/invasion/colony assays, xenograft OM model, Rap1 signaling assay, exosome characterization, fibroblast co-culture","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, in vitro and in vivo functional validation of specific mutation with pathway identification","pmids":["40860157"],"is_preprint":false},{"year":2025,"finding":"Solo interacts with LARG and is required to maintain LARG activity at cell-substrate adhesions; LARG is required for Solo-induced actin polymerization and for actin cytoskeletal remodeling in response to substrate stiffness.","method":"BioID proximity labeling, co-immunoprecipitation, siRNA knockdown, live cell imaging, actin polymerization assay, traction force on substrates of varying stiffness","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BioID plus Co-IP plus functional KD assays, single lab","pmids":["41739636"],"is_preprint":false},{"year":2006,"finding":"A Tyr1306Cys variant of LARG has reduced RhoA GEF activity in transfection assays in NIH3T3 cells compared to the Tyr1306 form, demonstrating that this residue influences LARG catalytic function.","method":"Transient transfection, RhoA activation assay (reporter/activity)","journal":"Diabetes","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single transfection assay without detailed mechanistic follow-up","pmids":["16644711"],"is_preprint":false},{"year":2014,"finding":"LARG interacts with TELO2 and pericentrin (PCNT) and a subset co-localizes with PCNT at the centrosome; LARG-deficient cells exhibit replication stress signaling defects including supernumerary centrosomes, reduced γH2AX and RPA foci, and reduced Chk1 activation.","method":"Yeast 2-hybrid, co-immunoprecipitation, immunofluorescence co-localization, siRNA knockdown, γH2AX/RPA foci assay, Chk1 activation assay","journal":"Cell cycle","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, interaction confirmed by Co-IP but mechanism linking LARG to DNA damage signaling is not fully defined","pmids":["25485589"],"is_preprint":false},{"year":2008,"finding":"The LARG PDZ domain has degenerate binding specificity for carboxyterminal peptides, binding five diverse biological partners; phage display identifies a broad sequence preference rather than a strict binding motif.","method":"Phage display peptide library, fluorescence polarization binding assay, synthetic peptide binding assays","journal":"Acta biochimica Polonica","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, binding affinity measurements only without cellular functional validation","pmids":["18542831"],"is_preprint":false}],"current_model":"ARHGEF12/LARG is a RhoA-subfamily-specific guanine nucleotide exchange factor (GEF) with the highest reported DH-domain catalytic activity among Dbl-family GEFs; it is activated downstream of multiple upstream inputs—including Gα12/13 and Gαq-coupled GPCRs, integrin-mediated mechanical force (via Fyn kinase), Plexin-B/semaphorin receptors (via PDZ-domain interaction), RSK2 phosphorylation at Ser1288 (promoting membrane translocation), Cdk1 phosphorylation at Ser190/Ser1176 (inhibiting activity during mitosis), CYLD-mediated deubiquitination (activating LARG), and Dia1/RhoA-dependent positive feedback—and is regulated by autoinhibitory C-terminal oligomerization; it coordinates RhoA-dependent processes including vascular tone, myogenic vasoconstriction, mechanotransduction, cell migration, cytokinesis (abscission), MTOC polarity, erythropoiesis, and smooth muscle differentiation, and in certain endothelial cell contexts can also activate Rap1A to maintain barrier integrity."},"narrative":{"mechanistic_narrative":"ARHGEF12 (LARG) is a RhoA-subfamily-specific guanine nucleotide exchange factor that couples diverse upstream receptors and mechanical inputs to RhoA-dependent cytoskeletal and contractile programs [PMID:11094164, PMID:21454492]. Its DH domain is specific for RhoA, RhoB, and RhoC and catalyzes nucleotide exchange with the highest reported activity among Dbl-family GEFs, with an N-terminal regulatory region of the DH domain mediating association with GDP-bound RhoA and the PH domain contributing regulatory protein interactions near the membrane rather than catalysis itself [PMID:19560536, PMID:21454492]. LARG operates as an integral effector linking Gα12/13-coupled GPCRs to Rho signaling, and combined genetic loss of LARG with related RGS-RhoGEFs abolishes Gα12/13-to-Rho signaling, causing embryonic lethality [PMID:11094164, PMID:23467409]. It is additionally activated by Gαq-coupled receptors, by Plexin-B/semaphorin receptors through a PDZ-domain interaction with the Plexin C-terminus, and by integrin-borne mechanical force via the Src-family kinase Fyn, the last establishing LARG as the principal mediator of force-driven RhoA activation and cellular stiffening in adhesion complexes [PMID:12183458, PMID:12196628, PMID:21572419, PMID:22100544, PMID:29208526]. LARG activity is tuned by multiple layers of regulation: autoinhibitory C-terminal oligomerization [PMID:14712228], stimulatory phosphorylation by RSK2 at Ser1288 that drives membrane translocation [PMID:29279389, PMID:41338458], inhibitory Cdk1 phosphorylation at Ser190/Ser1176 during mitosis [PMID:26483157], CYLD-mediated deubiquitination that enhances exchange activity [PMID:23405219], and a Dia1/RhoA-dependent positive feedback loop in which the Dia1 FH2 domain stimulates LARG GEF activity [PMID:17575049]. Through these inputs LARG coordinates vascular smooth muscle contraction and myogenic vasoconstriction [PMID:18084302, PMID:31549965], airway smooth muscle hyperresponsiveness [PMID:30385725], smooth muscle differentiation [PMID:20702813], cell migration and Rac-to-Rho crosstalk [PMID:38102112], cytokinesis abscission at the central spindle and midbody [PMID:23885121], MTOC polarity [PMID:17959834], and erythroid differentiation via a p38 pathway [PMID:31467124]. In tight-junction-forming endothelial cells LARG instead selectively activates Rap1A to maintain barrier integrity [PMID:35294066].","teleology":[{"year":2000,"claim":"Established that LARG is a functional RhoA activator and the molecular link between Gα12-family-coupled GPCRs and Rho signaling, defining its core pathway position.","evidence":"In vivo RhoA activation assay and co-immunoprecipitation in mammalian cells","pmids":["11094164"],"confidence":"High","gaps":["Catalytic specificity and kinetics not yet defined","Direct versus indirect Gα12 coupling not resolved at this stage"]},{"year":2002,"claim":"Identified the PDZ domain as a receptor-docking module that connects LARG to Plexin-B/semaphorin signaling, showing LARG is recruited by specific receptor tails to activate RhoA.","evidence":"Affinity pulldown from brain, PDZ mutagenesis, and RhoA activation/dominant-negative assays, replicated by two labs","pmids":["12183458","12196628"],"confidence":"High","gaps":["Structural basis of PDZ recognition not defined","Whether Plexin binding alters LARG catalytic state unknown"]},{"year":2002,"claim":"Showed LARG activity is enhanced by tyrosine phosphorylation downstream of GPCRs, introducing the concept of kinase-driven feedback on LARG.","evidence":"Tyrosine phosphorylation assays, kinase inhibitors, and RhoA-GTP pulldown after thrombin stimulation","pmids":["11799111"],"confidence":"Medium","gaps":["Phosphosites not mapped","Single lab; mechanism of activity enhancement undefined"]},{"year":2004,"claim":"Revealed autoinhibition via C-terminal oligomerization, explaining how LARG basal activity is restrained.","evidence":"Co-IP, in vitro GEF assay, SRE reporter and focus-formation assays with C-terminal truncations","pmids":["14712228"],"confidence":"Medium","gaps":["Structural detail of oligomerization interface lacking","Physiological trigger for de-oligomerization unknown"]},{"year":2007,"claim":"Defined a Dia1/RhoA-dependent positive feedback loop in which the RhoA effector Dia1 directly stimulates LARG exchange activity, amplifying RhoA signaling.","evidence":"In vitro GEF reconstitution, Co-IP, autoinhibition-release and siRNA assays","pmids":["17575049"],"confidence":"High","gaps":["Quantitative contribution of feedback in vivo unclear","Whether feedback is cell-type restricted not resolved"]},{"year":2007,"claim":"Extended LARG function to MTOC polarization and microtubule dynamics downstream of G12/13, linking LARG to centrosomal organization through pericentrin association.","evidence":"Gα12/13-deficient MEFs, siRNA, confocal imaging, pericentrin Co-IP","pmids":["17959834"],"confidence":"Medium","gaps":["Whether centrosomal RhoA activation is required not shown","Direct vs indirect pericentrin interaction unresolved"]},{"year":2007,"claim":"Demonstrated physiological necessity of G12/13-LARG signaling in vascular smooth muscle for salt-induced hypertension, distinguishing it from basal blood pressure control.","evidence":"Smooth muscle-specific inducible LARG knockout mice with blood pressure telemetry and salt loading","pmids":["18084302"],"confidence":"High","gaps":["Upstream receptor in salt-induced response not pinpointed","Compensation by other RhoGEFs not fully excluded"]},{"year":2007,"claim":"Placed LARG downstream of fibronectin/integrin adhesion, showing it acts with p115 RhoGEF to drive stress fiber and focal adhesion formation.","evidence":"Active-GEF pulldown, siRNA, actin/focal adhesion staining and RhoA-GTP pulldown","pmids":["17971419"],"confidence":"Medium","gaps":["Direct adhesion-receptor coupling mechanism undefined at this stage"]},{"year":2009,"claim":"Connected LARG to axon guidance, showing FAK-dependent tyrosine phosphorylation drives RGMa/Unc5B-induced RhoA activation and growth cone collapse.","evidence":"Co-IP, siRNA, tyrosine phosphorylation and growth cone collapse assays","pmids":["19273616"],"confidence":"Medium","gaps":["Phosphosites mediating activation not mapped","Single lab"]},{"year":2009,"claim":"Showed mDia1 activates the LARG/RhoA/ROCK axis in neutrophil chemotaxis, reinforcing the Dia1-LARG feedback in a physiological migration context.","evidence":"mDia1-KO neutrophils, RhoA/ROCK assays, chemotaxis assays","pmids":["19265163"],"confidence":"Medium","gaps":["Direct vs indirect mDia1-LARG coupling in neutrophils not isolated"]},{"year":2009,"claim":"Dissected the PH domain's role, showing a conserved hydrophobic patch is needed for cellular RhoA activation through regulatory interactions, not catalysis or membrane targeting per se.","evidence":"PH domain mutagenesis, in vitro exchange assay, reporter assay, membrane-targeting fusion rescue","pmids":["19560536"],"confidence":"High","gaps":["Identity of the regulatory proteins bound by the patch unknown"]},{"year":2011,"claim":"Quantified LARG catalytic specificity and power, establishing it as RhoA/B/C-specific with the highest reported Dbl-family GEF activity and an N-terminal DH region engaging GDP-bound RhoA.","evidence":"In vitro kinetic nucleotide-exchange assays with substrate-specificity panel and comparative DH analysis","pmids":["21454492"],"confidence":"High","gaps":["Structural basis of the N-terminal regulatory region not solved here"]},{"year":2011,"claim":"Identified Fyn as the upstream kinase activating LARG under integrin tensional force, defining a mechanotransduction pathway distinct from GEF-H1/FAK-Ras-ERK.","evidence":"Magnetic twisting cytometry, GEF activation assays, siRNA, Co-IP and atomic force microscopy","pmids":["21572419"],"confidence":"High","gaps":["Fyn phosphosites on LARG not mapped","How force is transduced to Fyn-LARG not fully defined"]},{"year":2011,"claim":"Showed Gαq-coupled receptors activate LARG via its DH-PH tandem independently of PLCβ, broadening LARG's upstream Gα repertoire beyond G12/13.","evidence":"Co-IP, SRF reporter, dominant-active Gαq, siRNA and receptor pharmacology","pmids":["22100544"],"confidence":"Medium","gaps":["Direct Gαq-LARG binding interface undefined","Single lab"]},{"year":2012,"claim":"Established NIS as a binding partner that sequesters LARG at the plasma membrane to modulate RhoA-dependent motility and invasion.","evidence":"Co-IP, migration/invasion assays, NIS localization manipulation","pmids":["22962269"],"confidence":"Medium","gaps":["Direct binding interface not mapped","Single lab; physiological relevance limited to specific contexts"]},{"year":2012,"claim":"Linked LARG to angiotensin II/AT1R-driven vascular contraction through the RhoA/MYPT1 axis, supporting its role in vascular tone.","evidence":"siRNA, RhoA activity and MYPT1 phosphorylation Western blots, isometric contraction","pmids":["23123644"],"confidence":"Medium","gaps":["Direct receptor-LARG coupling step not shown"]},{"year":2013,"claim":"Provided definitive genetic proof that LARG, redundantly with PDZ-RhoGEF and p115, is required for Gα12/13-to-Rho signaling and embryonic development.","evidence":"Single/double/triple knockout mice and MEF signaling assays (RhoA-GTP, JNK/p38)","pmids":["23467409"],"confidence":"High","gaps":["Non-redundant LARG-specific functions in development not isolated here"]},{"year":2013,"claim":"Identified a cytokinesis function, localizing LARG to the central spindle and midbody and showing it is required specifically for abscission.","evidence":"siRNA, live imaging, immunofluorescence colocalization with tubulin/RhoA, rescue, Aurora-B inhibition","pmids":["23885121"],"confidence":"Medium","gaps":["Recruitment mechanism to the midbody unknown","Relationship to Aurora-B abscission checkpoint not fully defined"]},{"year":2013,"claim":"Established CYLD as a deubiquitinase that activates LARG, adding ubiquitin removal as a regulatory layer controlling exchange activity and cell polarity.","evidence":"Co-IP, ubiquitination/deubiquitination assays, RhoA-GTP pulldown, cytoskeletal phenotyping","pmids":["23405219"],"confidence":"Medium","gaps":["Ubiquitin sites on LARG not mapped","E3 ligase that ubiquitinates LARG unidentified"]},{"year":2014,"claim":"Extended LARG mechanotransduction to endothelial ICAM-1, showing it drives RhoA-mediated stiffening required for leukocyte crawling and transendothelial migration.","evidence":"Magnetic twisting cytometry on ICAM-1, siRNA, RhoA pulldown, TEM and traction force assays","pmids":["24585879"],"confidence":"Medium","gaps":["Direct ICAM-1-LARG coupling not shown"]},{"year":2014,"claim":"Showed TGF-β/ALK5-driven EMT degrades LARG (and GEF-H1) via the proteasome, reducing stiffness and the mechanical stiffening response while promoting invasion.","evidence":"TGF-β treatment, proteasome inhibition, siRNA, magnetic twisting cytometry, invasion assays","pmids":["25143398"],"confidence":"Medium","gaps":["E3 ligase mediating LARG degradation unidentified"]},{"year":2014,"claim":"Demonstrated inflammatory JNK signaling upregulates LARG expression to sustain RhoA/Rho-kinase-driven smooth muscle hypercontraction.","evidence":"siRNA, JNK inhibitor, Western blot, Rho kinase activity and contraction assays","pmids":["24740538"],"confidence":"Medium","gaps":["Transcriptional mechanism of LARG induction not defined"]},{"year":2015,"claim":"Established Cdk1 as a mitotic kinase that phosphorylates LARG at Ser190/Ser1176 to suppress its GEF activity, providing cell-cycle control of RhoA activation.","evidence":"In vitro Cdk1 kinase assay, phosphospecific antibodies, phosphonull/phosphomimetic mutants, RhoA activity assay, immunofluorescence","pmids":["26483157"],"confidence":"High","gaps":["Structural basis of phospho-inhibition unknown","Coordination with abscission role not reconciled"]},{"year":2015,"claim":"Confirmed in vivo that LARG is required for C-RGMa/Rho/ROCK-mediated axon layer targeting in the developing tectum.","evidence":"Dominant-negative LARG in chick tectum via in ovo electroporation and axon projection analysis","pmids":["26292756"],"confidence":"Medium","gaps":["Dominant-negative approach; endogenous LARG loss-of-function not tested"]},{"year":2017,"claim":"Identified RSK2 as a kinase that binds and phosphorylates LARG at Ser1288 to activate RhoA/RhoB-dependent migration and invasion.","evidence":"Co-IP, in vitro kinase assay, RhoA-GTP pulldown, site-directed mutagenesis, migration/invasion assays","pmids":["29279389"],"confidence":"High","gaps":["Membrane translocation mechanism not yet defined (addressed later)"]},{"year":2017,"claim":"Placed LARG in the DC-SIGN signalosome facilitating HIV-1 internalization in dendritic cells, with cocaine enhancing complex assembly.","evidence":"Co-IP, HIV-1 internalization and trafficking imaging, siRNA","pmids":["28094782"],"confidence":"Medium","gaps":["Direct DC-SIGN-LARG interaction not isolated","Single lab"]},{"year":2017,"claim":"Established LARG as the primary mediator of mechanical strain-induced RhoA activation in mesenchymal stem cell lineage commitment, restraining adipogenesis.","evidence":"siRNA, RhoA-GTP pulldown, mechanical strain, adipogenesis/osteogenesis assays","pmids":["29208526"],"confidence":"Medium","gaps":["Upstream strain sensor coupling to LARG not defined"]},{"year":2018,"claim":"Demonstrated LARG is required for IL17A-induced airway smooth muscle contractility and airway hyperresponsiveness in vivo, independent of inflammation.","evidence":"Arhgef12-KO mice, tracheal ring contraction, RhoA activation, house dust mite allergen model","pmids":["30385725"],"confidence":"High","gaps":["IL17A receptor-to-LARG coupling mechanism undefined"]},{"year":2019,"claim":"Confirmed G12/13-LARG-RhoA signaling is required for pressure-induced myogenic vasoconstriction and systemic vascular resistance.","evidence":"Smooth muscle-specific conditional LARG knockout mice, pressure myography, RhoA activity and Ca2+ measurements","pmids":["31549965"],"confidence":"High","gaps":["Molecular pressure sensor upstream of LARG not identified"]},{"year":2019,"claim":"Extended LARG function to erythropoiesis, showing it regulates erythroid differentiation through a RhoA/p38 pathway.","evidence":"Zebrafish morpholino/CRISPR KO, p38 assay, RhoA/p38 rescue, K562 and 32D differentiation assays","pmids":["31467124"],"confidence":"Medium","gaps":["Link between RhoA and p38 in this context not mechanistically detailed"]},{"year":2022,"claim":"Revealed a context-specific switch in which endothelial LARG selectively activates Rap1A (not Rho GTPases) to maintain tight-junction barrier integrity under TNF challenge.","evidence":"Cell-free GEF assay with immunoprecipitated ArhGEF12, active-GEF pulldown, TEER and tight junction staining","pmids":["35294066"],"confidence":"Medium","gaps":["Structural determinant of the RhoA-vs-Rap1A switch unknown","Single lab; unexpected substrate specificity"]},{"year":2023,"claim":"Positioned LARG as the molecular link coupling Rac activity to RhoA activation at cell protrusions/retractions during migration.","evidence":"FRET Rho GTPase biosensors, optogenetic Rac activation, siRNA, live migration analysis","pmids":["38102112"],"confidence":"High","gaps":["Mechanism of Rac-dependent membrane recruitment of LARG not defined"]},{"year":2025,"claim":"Refined the RSK2-LARG axis by showing Ser1288 phosphorylation drives LARG membrane translocation and LARG-RhoA complex assembly downstream of EGF in glioblastoma.","evidence":"Phosphospecific antibodies, membrane fractionation, Co-IP, RhoA-GTP pulldown, EGF stimulation in patient-derived GBM cells","pmids":["41338458"],"confidence":"Medium","gaps":["Membrane anchor recognizing phospho-LARG not identified","Single lab"]},{"year":2025,"claim":"Identified Solo as a partner maintaining LARG activity at cell-substrate adhesions for substrate-stiffness-dependent actin remodeling.","evidence":"BioID, Co-IP, siRNA, live imaging, actin polymerization and traction-force assays","pmids":["41739636"],"confidence":"Medium","gaps":["Direct vs proximity interaction not fully resolved","Single lab"]},{"year":2025,"claim":"Linked an ARHGEF12 E620K mutation to oncogenic Rap1 activation, ITGA6 upregulation, and pro-metastatic exosome-driven fibroblast education in ovarian cancer.","evidence":"Ectopic E620K expression, in vitro migration/invasion/colony assays, xenograft, Rap1 assay, exosome characterization, fibroblast co-culture","pmids":["40860157"],"confidence":"Medium","gaps":["How E620K shifts substrate preference toward Rap1 not structurally defined","Single lab"]},{"year":null,"claim":"The structural basis governing LARG's substrate switch between RhoA-subfamily GTPases and Rap1A, and how the converging regulatory inputs (oligomerization, phosphorylation, ubiquitination, partner binding) are integrated on a single molecule, remain unresolved.","evidence":"No discovery in the corpus provides a unifying structural or quantitative model of LARG regulatory integration","pmids":[],"confidence":"Low","gaps":["No structure of full-length regulated LARG","Determinants of RhoA-vs-Rap1A specificity unknown","Hierarchy among competing regulatory inputs undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,5,23,25]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1,12,14]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[12,15,33]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[4,23]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[7,18,35]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,14,17]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[6,28,29]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[18,23]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[17,24,30]}],"complexes":["DC-SIGN signalosome"],"partners":["RHOA","PLXNB1","DIAPH1","RSK2","CYLD","FYN","GNA13","PCNT"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NZN5","full_name":"Rho guanine nucleotide exchange factor 12","aliases":["Leukemia-associated RhoGEF"],"length_aa":1544,"mass_kda":173.2,"function":"Acts as guanine nucleotide exchange factor (GEF) for RhoA GTPase and may act as GTPase-activating protein (GAP) for GNA12 and GNA13 (PubMed:11094164). May play a role in the regulation of RhoA GTPase by guanine nucleotide-binding alpha-12 (GNA12) and alpha-13 (GNA13) (PubMed:11094164). Promotes endothelial cell and actin stress fiber reorientation in response to mechanotransduction (By similarity)","subcellular_location":"Cytoplasm; Membrane","url":"https://www.uniprot.org/uniprotkb/Q9NZN5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ARHGEF12","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000196914","cell_line_id":"CID000566","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"membrane","grade":2}],"interactors":[{"gene":"MYO6","stoichiometry":4.0},{"gene":"ARHGEF11","stoichiometry":4.0},{"gene":"GIPC1","stoichiometry":4.0},{"gene":"VAPA","stoichiometry":0.2},{"gene":"CALM1","stoichiometry":0.2},{"gene":"CALM2","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2},{"gene":"LDHB","stoichiometry":0.2},{"gene":"PSMC2","stoichiometry":0.2},{"gene":"PSMD13","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000566","total_profiled":1310},"omim":[{"mim_id":"620665","title":"PLECKSTRIN HOMOLOGY DOMAIN- AND RhoGEF DOMAIN-CONTAINING PROTEIN G4B; PLEKHG4B","url":"https://www.omim.org/entry/620665"},{"mim_id":"614790","title":"WT1-INTERACTING PROTEIN; WTIP","url":"https://www.omim.org/entry/614790"},{"mim_id":"607792","title":"GERMINAL CENTER-ASSOCIATED, SIGNALING AND MOTILITY; GCSAM","url":"https://www.omim.org/entry/607792"},{"mim_id":"604763","title":"RHO GUANINE NUCLEOTIDE EXCHANGE FACTOR 12; ARHGEF12","url":"https://www.omim.org/entry/604763"},{"mim_id":"604406","title":"GUANINE NUCLEOTIDE-BINDING PROTEIN, ALPHA-13; GNA13","url":"https://www.omim.org/entry/604406"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ARHGEF12"},"hgnc":{"alias_symbol":["KIAA0382","LARG"],"prev_symbol":[]},"alphafold":{"accession":"Q9NZN5","domains":[{"cath_id":"2.30.42.10","chopping":"68-149","consensus_level":"medium","plddt":86.3046,"start":68,"end":149},{"cath_id":"1.10.167.10","chopping":"371-556","consensus_level":"high","plddt":84.3006,"start":371,"end":556},{"cath_id":"1.20.900.10","chopping":"768-984","consensus_level":"high","plddt":93.2895,"start":768,"end":984},{"cath_id":"2.30.29.30","chopping":"1001-1065_1074-1138","consensus_level":"high","plddt":87.9747,"start":1001,"end":1138},{"cath_id":"1.10.287","chopping":"202-252","consensus_level":"high","plddt":89.3482,"start":202,"end":252}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZN5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZN5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZN5-F1-predicted_aligned_error_v6.png","plddt_mean":60.22},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ARHGEF12","jax_strain_url":"https://www.jax.org/strain/search?query=ARHGEF12"},"sequence":{"accession":"Q9NZN5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NZN5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NZN5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZN5"}},"corpus_meta":[{"pmid":"18084302","id":"PMC_18084302","title":"G12-G13-LARG-mediated 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this interaction is required for semaphorin-induced RhoA activation and cytoskeletal reorganization.\",\n      \"method\": \"Affinity pulldown from mouse brain, co-immunoprecipitation, PDZ domain mutagenesis, RhoA activation assay, dominant-negative experiments\",\n      \"journal\": \"The Journal of biological chemistry; Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — independently replicated by two labs (PMID 12183458 and 12196628), PDZ domain mutagenesis and interaction-defective Plexin-B1 mutant confirmed mechanism\",\n      \"pmids\": [\"12183458\", \"12196628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"FAK tyrosine-phosphorylates LARG in response to thrombin receptor activation, enhancing RhoA activation; this constitutes a positive feedback loop for sustained Rho activation downstream of GPCRs.\",\n      \"method\": \"Tyrosine phosphorylation assays, kinase inhibitor experiments, co-immunoprecipitation, RhoA-GTP pulldown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple biochemical methods including phosphorylation assays and RhoA activity measurements\",\n      \"pmids\": [\"11799111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LARG forms homo- and hetero-oligomers with PDZ-RhoGEF via their C-terminal regions; deletion of the C-terminal tail increases in vivo RhoA-GEF activity and transforming potential, identifying C-terminal oligomerization as an autoinhibitory mechanism.\",\n      \"method\": \"Co-immunoprecipitation, in vitro GEF assay, serum response element reporter assay, Rho-GTP pulldown, focus formation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple orthogonal methods (Co-IP, in vitro GEF assay, reporter assay, transformation assay)\",\n      \"pmids\": [\"14712228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LARG is required for G12/G13-mediated MTOC polarization and microtubule dynamics; LARG associates with pericentrin and localizes to the MTOC and along microtubule tracks.\",\n      \"method\": \"Gα12/13-deficient MEFs, siRNA knockdown, confocal microscopy, co-immunoprecipitation with pericentrin\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, genetic (KO MEFs) and imaging approaches with localization data\",\n      \"pmids\": [\"17959834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The RhoA effector Dia1 binds to LARG in a RhoA-dependent manner (releasing Dia1 autoinhibition), and the Dia1 FH2 domain stimulates LARG guanine nucleotide exchange activity in vitro, creating a positive feedback loop for RhoA activation.\",\n      \"method\": \"In vitro GEF assay, co-immunoprecipitation, autoinhibition release assay, siRNA knockdown with RhoA/ROCK signaling readout\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro GEF reconstitution assay plus binding and cellular assays in single rigorous study\",\n      \"pmids\": [\"17575049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"G12-G13-LARG signaling in vascular smooth muscle is required for salt-induced hypertension but not for basal blood pressure regulation, established using smooth muscle-specific inducible Cre/loxP deletion of LARG in mice.\",\n      \"method\": \"Smooth muscle-specific inducible LARG knockout mouse, blood pressure telemetry, salt-loading model\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional KO mouse model with defined physiological phenotype, replicated in subsequent studies\",\n      \"pmids\": [\"18084302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LARG is activated downstream of fibronectin adhesion and, together with Lsc/p115 RhoGEF, mediates RhoA activation and formation of stress fibers and focal adhesions in response to fibronectin.\",\n      \"method\": \"Affinity pulldown for active GEFs, siRNA knockdown, actin/focal adhesion staining, RhoA-GTP pulldown\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple orthogonal methods including active GEF pulldown and functional readouts\",\n      \"pmids\": [\"17971419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"LARG associates with Unc5B coreceptor downstream of neogenin/RGMa; FAK-dependent tyrosine phosphorylation of LARG mediates RGMa-induced RhoA activation and growth cone collapse.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, tyrosine phosphorylation assay, RhoA activation assay, growth cone collapse assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, reciprocal Co-IP plus functional rescue assays\",\n      \"pmids\": [\"19273616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"mDia1 activates the LARG/RhoA/ROCK signaling axis in neutrophil chemotaxis; mDia1-deficient neutrophils show impaired LARG and RhoA activation, polarization, and directional migration.\",\n      \"method\": \"mDia1 knockout mouse neutrophils, RhoA-GTP pulldown, ROCK activity assay, chemotaxis assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model, multiple signaling and functional readouts in single study\",\n      \"pmids\": [\"19265163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The LARG PH domain contains a conserved hydrophobic patch that is required for RhoA activation and stress fiber induction in cells but not for nucleotide exchange activity in vitro; this patch mediates regulatory protein interactions near the membrane rather than membrane targeting per se.\",\n      \"method\": \"PH domain mutagenesis, in vitro nucleotide exchange assay, transcriptional reporter assay, confocal microscopy, membrane-targeting domain fusion rescue\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro assay combined with mutagenesis and cellular functional assays in a single rigorous study\",\n      \"pmids\": [\"19560536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"S1P receptor 2 (S1PR2) activates RhoA in smooth muscle cells specifically through LARG (not PDZ-RhoGEF or p115), and this LARG-RhoA pathway promotes smooth muscle differentiation marker gene expression.\",\n      \"method\": \"siRNA knockdown, RhoA-GTP pulldown, smooth muscle promoter reporter assay, myocardin-related transcription factor nuclear localization, scratch wound/transwell migration assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple functional and signaling readouts with RGS-RhoGEF-specific knockdowns\",\n      \"pmids\": [\"20702813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Application of tensional force to integrins activates LARG through the Src family kinase Fyn, recruiting LARG to adhesion complexes and increasing cellular stiffness (reinforcement); this is mechanistically distinct from GEF-H1 activation via FAK-Ras-ERK.\",\n      \"method\": \"Magnetic twisting cytometry, biochemical GEF activation assays, siRNA knockdown, co-immunoprecipitation, atomic force microscopy\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal biophysical and biochemical methods, identified Fyn as upstream activator with pathway specificity demonstrated\",\n      \"pmids\": [\"21572419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The DH domain of LARG is specific for RhoA, RhoB, and RhoC (inactive toward Rac1, Cdc42, TC10) and exhibits the highest catalytic GEF activity reported for a Dbl protein (~10^7-fold acceleration of nucleotide exchange); the PH domain does not contribute to DH activity in LARG, and a novel N-terminal regulatory region of the DH domain mediates association with GDP-bound RhoA.\",\n      \"method\": \"In vitro kinetic nucleotide exchange assays (fluorescent RhoA reporter), comparative DH domain analysis, substrate specificity panel\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — rigorous in vitro reconstitution with kinetic measurements, replicated across multiple GEF family members in same study\",\n      \"pmids\": [\"21454492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LARG is activated by Gαq-coupled receptors (histamine H1 receptor) through a mechanism requiring only the catalytic DH-PH tandem of LARG, independent of PLCβ activation and distinct from Gαq-mediated p63RhoGEF activation; activated Gαq physically interacts with LARG.\",\n      \"method\": \"Co-immunoprecipitation, SRF-reporter assay, dominant-active Gαq expression, siRNA knockdown, receptor-specific pharmacology\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple biochemical and reporter methods with receptor specificity controls\",\n      \"pmids\": [\"22100544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NIS (sodium/iodide symporter) binds LARG directly; this interaction sequesters LARG at the plasma membrane, modulating RhoA activity and cell motility/invasiveness.\",\n      \"method\": \"Co-immunoprecipitation, cell migration/invasion assays, NIS subcellular localization manipulation\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP binding established; functional consequences shown with localization manipulation, but single lab\",\n      \"pmids\": [\"22962269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Angiotensin II activates the LARG/RhoA/MYPT1 axis in vascular smooth muscle cells via the AT1 receptor; siRNA knockdown of LARG reduces Ang II-induced RhoA activity, MYPT1 phosphorylation, and aortic ring contraction.\",\n      \"method\": \"siRNA knockdown, Western blot for RhoA activity and MYPT1 phosphorylation, isometric contraction measurement\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple functional readouts with receptor-specific pharmacology\",\n      \"pmids\": [\"23123644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Combined genetic deletion of PDZ-RhoGEF and LARG in mice causes early embryonic lethality and developmental defects; triple deletion of PDZ-RhoGEF, LARG, and p115 abolishes Gα12/13-to-Rho signaling and thrombin-induced proliferation, directional migration, and JNK/p38 activation in MEFs.\",\n      \"method\": \"Knockout mouse generation, embryonic lethality analysis, MEF signaling assays, RhoA-GTP pulldown, JNK/p38 activation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic triple KO definitively establishes LARG as required effector in Gα12/13-to-Rho pathway, replicated across multiple signaling readouts\",\n      \"pmids\": [\"23467409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LARG localizes to the central spindle and midbody during cytokinesis and is required for abscission; LARG depletion causes persistent intercellular bridges and apoptosis without affecting furrow regression or early mitotic timing. Aurora-B inhibition rescues the delayed abscission kinetics.\",\n      \"method\": \"siRNA knockdown, live cell imaging, immunofluorescence colocalization with α-tubulin and RhoA, rescue expression, Aurora-B inhibition\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, live imaging plus rescue experiment, specific cytokinesis stage phenotype defined\",\n      \"pmids\": [\"23885121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CYLD deubiquitinase interacts with LARG and deubiquitinates it; CYLD-mediated deubiquitination of LARG enhances its ability to stimulate GDP/GTP exchange on RhoA, thereby regulating cytoskeletal rearrangement and cell polarity.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, deubiquitination assay, RhoA-GTP pulldown, cytoskeletal phenotype analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple biochemical methods establishing LARG as CYLD substrate with functional consequence\",\n      \"pmids\": [\"23405219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LARG acts downstream of mechanically stimulated ICAM-1 clusters in endothelial cells to increase RhoA activity and cellular stiffening; LARG depletion decreases leukocyte crawling and inhibits transendothelial migration.\",\n      \"method\": \"Magnetic twisting cytometry on ICAM-1 clusters, siRNA knockdown, RhoA-GTP pulldown, leukocyte TEM assay, traction force microscopy\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, biophysical and functional assays linking LARG to mechanical signaling downstream of ICAM-1\",\n      \"pmids\": [\"24585879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TGF-β-induced EMT causes proteasomal degradation of LARG and GEF-H1 via ALK5, leading to decreased cell stiffness, loss of stiffening response to integrin force, and increased invasion capacity.\",\n      \"method\": \"TGF-β treatment, proteasome inhibition, siRNA knockdown, magnetic twisting cytometry, Boyden chamber invasion assay, Western blot\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple orthogonal methods linking ALK5-driven LARG degradation to mechanical and invasion phenotypes\",\n      \"pmids\": [\"25143398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Jun kinase activity drives overexpression of LARG in response to inflammatory cytokines (IL-1β, TNF-α) in longitudinal smooth muscle cells, resulting in enhanced LARG/RhoA/Rho kinase signaling and sustained hypercontraction.\",\n      \"method\": \"siRNA, JNK inhibitor (SP600125), Western blot, Rho kinase activity assay, smooth muscle contraction assay\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, JNK inhibitor and siRNA with multiple downstream signaling and functional readouts\",\n      \"pmids\": [\"24740538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cdk1 directly phosphorylates LARG at Ser190 and Ser1176 during mitosis; phosphonull LARG is more active than phosphomimetic LARG in RhoA activation assays, indicating Cdk1 phosphorylation suppresses LARG GEF activity during mitosis. Phosphorylated LARG localizes to mitotic organizing centers and flanking the midbody.\",\n      \"method\": \"In vitro Cdk1 kinase assay, phosphospecific antibodies, phosphonull/phosphomimetic mutants, RhoA activity assay, immunofluorescence\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with site-specific mutagenesis and functional RhoA activity readout in same study\",\n      \"pmids\": [\"26483157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"C-RGMa peptide uses a LARG/Rho/ROCK pathway to inhibit axonal growth; dominant-negative LARG (LARG-PDZ) overexpression in the developing optic tectum causes overshoots in superficial tectal layers, establishing LARG as required for C-RGMa-mediated layer targeting.\",\n      \"method\": \"Dominant-negative LARG overexpression in chick embryo tectum, in ovo electroporation, axonal projection analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, in vivo dominant-negative approach with defined pathway selectivity (C-RGMa vs. N-RGMa)\",\n      \"pmids\": [\"26292756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RSK2 directly interacts with LARG and phosphorylates LARG at Ser1288, activating RhoA/RhoB-dependent cell migration and invasion; RSK2 Thr577 phosphorylation is required for LARG-RhoA pathway activation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, RhoA-GTP pulldown, site-directed mutagenesis, transwell migration/invasion assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis of both kinase and substrate, plus functional cell migration readout in single rigorous study\",\n      \"pmids\": [\"29279389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LARG is a component of the DC-SIGN signalosome and participates in DC-SIGN-mediated HIV-1 internalization in dendritic cells; cocaine enhances DC-SIGN/LARG/LSP1 complex formation, activating LARG-RhoA and focal adhesion signaling to facilitate HIV-1 transfer.\",\n      \"method\": \"Co-immunoprecipitation, HIV-1 internalization assay, intracellular trafficking imaging, siRNA knockdown\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and functional internalization assays, single lab\",\n      \"pmids\": [\"28094782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LARG knockdown in mesenchymal stem cells accelerates adipogenesis, reduces basal RhoA activity, and almost entirely inhibits mechanical strain-induced RhoA activation, establishing LARG as the primary mediator of force-driven RhoA activation in MSC lineage commitment.\",\n      \"method\": \"siRNA knockdown, RhoA-GTP pulldown, mechanical strain application, adipogenesis/osteogenesis assays (Oil-Red-O, ALP staining, qPCR)\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, clean KD with mechanical and biochemical readouts showing specificity of LARG for strain response\",\n      \"pmids\": [\"29208526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Arhgef12 is required for IL17A-induced airway smooth muscle contractility and airway hyperresponsiveness; Arhgef12-KO tracheal rings show decreased contractility and RhoA activation in response to IL17A, and Arhgef12-KO mice have reduced airway hyperresponsiveness in a house dust mite model without effects on inflammation.\",\n      \"method\": \"Arhgef12-KO mouse, tracheal ring contraction assay, RhoA activation assay, in vivo allergen sensitization model, airway hyperresponsiveness measurement\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with both ex vivo contraction assay and in vivo disease model, multiple readouts\",\n      \"pmids\": [\"30385725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"G12/G13- and LARG-mediated RhoA signaling in smooth muscle cells is required for myogenic vasoconstriction; smooth muscle-specific loss of G12/G13 or ARHGEF12 abolishes pressure-induced RhoA activation and myogenic tone in small arteries, reducing systemic vascular resistance.\",\n      \"method\": \"Smooth muscle-specific conditional LARG knockout mouse, pressure myography, RhoA activity assay, intracellular Ca2+ measurement\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse with ex vivo vascular physiology and molecular readouts, replicates and extends prior KO studies\",\n      \"pmids\": [\"31549965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ARHGEF12-RhoA signaling regulates erythroid differentiation via the p38 kinase pathway; arhgef12 knockdown/knockout in zebrafish impairs erythropoiesis, and active RhoA or p38 rescues this defect.\",\n      \"method\": \"Morpholino knockdown and CRISPR/Cas9 KO in zebrafish, p38 kinase assay, rescue with active RhoA/p38, human K562 and mouse 32D cell differentiation assays\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple model systems (zebrafish KO, cell lines), pathway rescue experiment, single lab\",\n      \"pmids\": [\"31467124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In tight junction-forming human dermal microvascular endothelial cells, ArhGEF12 selectively activates Rap1A (not RhoA, RhoB, RhoC, or Rap1B) in cell-free assays; ARHGEF12 depletion exacerbates TNF-induced barrier disruption by reducing GTP-bound Rap1A.\",\n      \"method\": \"siRNA knockdown, trans-endothelial electrical resistance, cell-free GEF assay with immunoprecipitated ArhGEF12, active GEF pulldown, tight junction staining\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-free biochemical assay plus functional barrier assay, single lab; unexpected finding (Rap1A activation) supported by multiple methods\",\n      \"pmids\": [\"35294066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Arhgef12 (and Arhgef11) are enriched at transient cell protrusions and retractions, recruited to the plasma membrane by active Rac; their depletion reduces Rac-to-Rho activity crosstalk, cell protrusion-retraction dynamics, and migration distance, placing Arhgef12 as the molecular link coupling Rac activity to RhoA activation during cell migration.\",\n      \"method\": \"FRET-based Rho GTPase activity biosensors, optogenetic Rac activation, siRNA knockdown, live cell migration analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — optogenetic perturbation combined with live biosensor imaging and KD in single rigorous study\",\n      \"pmids\": [\"38102112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RSK2 phosphorylation of LARG at S1288 promotes membrane translocation of LARG and markedly enhances assembly of the LARG-RhoA complex and GTP loading of RhoA in response to EGF; this pathway is active in glioblastoma cells.\",\n      \"method\": \"Phosphospecific antibodies, membrane fractionation, co-immunoprecipitation, RhoA-GTP pulldown, EGF stimulation, patient-derived GBM cell lines\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, extends prior RSK2-LARG study with new mechanistic detail on membrane translocation, multiple biochemical readouts\",\n      \"pmids\": [\"41338458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ARHGEF12 E620K mutation activates Rap1 signaling, upregulates ITGA6 expression, and promotes formation of ITGA6-high exosomes that educate ovarian fibroblasts toward cancer-associated fibroblast phenotypes, facilitating pre-metastatic niche formation.\",\n      \"method\": \"Ectopic expression of E620K mutant, in vitro migration/invasion/colony assays, xenograft OM model, Rap1 signaling assay, exosome characterization, fibroblast co-culture\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, in vitro and in vivo functional validation of specific mutation with pathway identification\",\n      \"pmids\": [\"40860157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Solo interacts with LARG and is required to maintain LARG activity at cell-substrate adhesions; LARG is required for Solo-induced actin polymerization and for actin cytoskeletal remodeling in response to substrate stiffness.\",\n      \"method\": \"BioID proximity labeling, co-immunoprecipitation, siRNA knockdown, live cell imaging, actin polymerization assay, traction force on substrates of varying stiffness\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BioID plus Co-IP plus functional KD assays, single lab\",\n      \"pmids\": [\"41739636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A Tyr1306Cys variant of LARG has reduced RhoA GEF activity in transfection assays in NIH3T3 cells compared to the Tyr1306 form, demonstrating that this residue influences LARG catalytic function.\",\n      \"method\": \"Transient transfection, RhoA activation assay (reporter/activity)\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single transfection assay without detailed mechanistic follow-up\",\n      \"pmids\": [\"16644711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LARG interacts with TELO2 and pericentrin (PCNT) and a subset co-localizes with PCNT at the centrosome; LARG-deficient cells exhibit replication stress signaling defects including supernumerary centrosomes, reduced γH2AX and RPA foci, and reduced Chk1 activation.\",\n      \"method\": \"Yeast 2-hybrid, co-immunoprecipitation, immunofluorescence co-localization, siRNA knockdown, γH2AX/RPA foci assay, Chk1 activation assay\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, interaction confirmed by Co-IP but mechanism linking LARG to DNA damage signaling is not fully defined\",\n      \"pmids\": [\"25485589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The LARG PDZ domain has degenerate binding specificity for carboxyterminal peptides, binding five diverse biological partners; phage display identifies a broad sequence preference rather than a strict binding motif.\",\n      \"method\": \"Phage display peptide library, fluorescence polarization binding assay, synthetic peptide binding assays\",\n      \"journal\": \"Acta biochimica Polonica\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, binding affinity measurements only without cellular functional validation\",\n      \"pmids\": [\"18542831\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ARHGEF12/LARG is a RhoA-subfamily-specific guanine nucleotide exchange factor (GEF) with the highest reported DH-domain catalytic activity among Dbl-family GEFs; it is activated downstream of multiple upstream inputs—including Gα12/13 and Gαq-coupled GPCRs, integrin-mediated mechanical force (via Fyn kinase), Plexin-B/semaphorin receptors (via PDZ-domain interaction), RSK2 phosphorylation at Ser1288 (promoting membrane translocation), Cdk1 phosphorylation at Ser190/Ser1176 (inhibiting activity during mitosis), CYLD-mediated deubiquitination (activating LARG), and Dia1/RhoA-dependent positive feedback—and is regulated by autoinhibitory C-terminal oligomerization; it coordinates RhoA-dependent processes including vascular tone, myogenic vasoconstriction, mechanotransduction, cell migration, cytokinesis (abscission), MTOC polarity, erythropoiesis, and smooth muscle differentiation, and in certain endothelial cell contexts can also activate Rap1A to maintain barrier integrity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ARHGEF12 (LARG) is a RhoA-subfamily-specific guanine nucleotide exchange factor that couples diverse upstream receptors and mechanical inputs to RhoA-dependent cytoskeletal and contractile programs [#0, #13]. Its DH domain is specific for RhoA, RhoB, and RhoC and catalyzes nucleotide exchange with the highest reported activity among Dbl-family GEFs, with an N-terminal regulatory region of the DH domain mediating association with GDP-bound RhoA and the PH domain contributing regulatory protein interactions near the membrane rather than catalysis itself [#10, #13]. LARG operates as an integral effector linking Gα12/13-coupled GPCRs to Rho signaling, and combined genetic loss of LARG with related RGS-RhoGEFs abolishes Gα12/13-to-Rho signaling, causing embryonic lethality [#0, #17]. It is additionally activated by Gαq-coupled receptors, by Plexin-B/semaphorin receptors through a PDZ-domain interaction with the Plexin C-terminus, and by integrin-borne mechanical force via the Src-family kinase Fyn, the last establishing LARG as the principal mediator of force-driven RhoA activation and cellular stiffening in adhesion complexes [#1, #12, #14, #27]. LARG activity is tuned by multiple layers of regulation: autoinhibitory C-terminal oligomerization [#3], stimulatory phosphorylation by RSK2 at Ser1288 that drives membrane translocation [#25, #33], inhibitory Cdk1 phosphorylation at Ser190/Ser1176 during mitosis [#23], CYLD-mediated deubiquitination that enhances exchange activity [#19], and a Dia1/RhoA-dependent positive feedback loop in which the Dia1 FH2 domain stimulates LARG GEF activity [#5]. Through these inputs LARG coordinates vascular smooth muscle contraction and myogenic vasoconstriction [#6, #29], airway smooth muscle hyperresponsiveness [#28], smooth muscle differentiation [#11], cell migration and Rac-to-Rho crosstalk [#32], cytokinesis abscission at the central spindle and midbody [#18], MTOC polarity [#4], and erythroid differentiation via a p38 pathway [#30]. In tight-junction-forming endothelial cells LARG instead selectively activates Rap1A to maintain barrier integrity [#31].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that LARG is a functional RhoA activator and the molecular link between Gα12-family-coupled GPCRs and Rho signaling, defining its core pathway position.\",\n      \"evidence\": \"In vivo RhoA activation assay and co-immunoprecipitation in mammalian cells\",\n      \"pmids\": [\"11094164\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic specificity and kinetics not yet defined\", \"Direct versus indirect Gα12 coupling not resolved at this stage\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified the PDZ domain as a receptor-docking module that connects LARG to Plexin-B/semaphorin signaling, showing LARG is recruited by specific receptor tails to activate RhoA.\",\n      \"evidence\": \"Affinity pulldown from brain, PDZ mutagenesis, and RhoA activation/dominant-negative assays, replicated by two labs\",\n      \"pmids\": [\"12183458\", \"12196628\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PDZ recognition not defined\", \"Whether Plexin binding alters LARG catalytic state unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed LARG activity is enhanced by tyrosine phosphorylation downstream of GPCRs, introducing the concept of kinase-driven feedback on LARG.\",\n      \"evidence\": \"Tyrosine phosphorylation assays, kinase inhibitors, and RhoA-GTP pulldown after thrombin stimulation\",\n      \"pmids\": [\"11799111\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphosites not mapped\", \"Single lab; mechanism of activity enhancement undefined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Revealed autoinhibition via C-terminal oligomerization, explaining how LARG basal activity is restrained.\",\n      \"evidence\": \"Co-IP, in vitro GEF assay, SRE reporter and focus-formation assays with C-terminal truncations\",\n      \"pmids\": [\"14712228\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural detail of oligomerization interface lacking\", \"Physiological trigger for de-oligomerization unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a Dia1/RhoA-dependent positive feedback loop in which the RhoA effector Dia1 directly stimulates LARG exchange activity, amplifying RhoA signaling.\",\n      \"evidence\": \"In vitro GEF reconstitution, Co-IP, autoinhibition-release and siRNA assays\",\n      \"pmids\": [\"17575049\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of feedback in vivo unclear\", \"Whether feedback is cell-type restricted not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended LARG function to MTOC polarization and microtubule dynamics downstream of G12/13, linking LARG to centrosomal organization through pericentrin association.\",\n      \"evidence\": \"Gα12/13-deficient MEFs, siRNA, confocal imaging, pericentrin Co-IP\",\n      \"pmids\": [\"17959834\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether centrosomal RhoA activation is required not shown\", \"Direct vs indirect pericentrin interaction unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated physiological necessity of G12/13-LARG signaling in vascular smooth muscle for salt-induced hypertension, distinguishing it from basal blood pressure control.\",\n      \"evidence\": \"Smooth muscle-specific inducible LARG knockout mice with blood pressure telemetry and salt loading\",\n      \"pmids\": [\"18084302\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream receptor in salt-induced response not pinpointed\", \"Compensation by other RhoGEFs not fully excluded\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placed LARG downstream of fibronectin/integrin adhesion, showing it acts with p115 RhoGEF to drive stress fiber and focal adhesion formation.\",\n      \"evidence\": \"Active-GEF pulldown, siRNA, actin/focal adhesion staining and RhoA-GTP pulldown\",\n      \"pmids\": [\"17971419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct adhesion-receptor coupling mechanism undefined at this stage\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected LARG to axon guidance, showing FAK-dependent tyrosine phosphorylation drives RGMa/Unc5B-induced RhoA activation and growth cone collapse.\",\n      \"evidence\": \"Co-IP, siRNA, tyrosine phosphorylation and growth cone collapse assays\",\n      \"pmids\": [\"19273616\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphosites mediating activation not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed mDia1 activates the LARG/RhoA/ROCK axis in neutrophil chemotaxis, reinforcing the Dia1-LARG feedback in a physiological migration context.\",\n      \"evidence\": \"mDia1-KO neutrophils, RhoA/ROCK assays, chemotaxis assays\",\n      \"pmids\": [\"19265163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect mDia1-LARG coupling in neutrophils not isolated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Dissected the PH domain's role, showing a conserved hydrophobic patch is needed for cellular RhoA activation through regulatory interactions, not catalysis or membrane targeting per se.\",\n      \"evidence\": \"PH domain mutagenesis, in vitro exchange assay, reporter assay, membrane-targeting fusion rescue\",\n      \"pmids\": [\"19560536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the regulatory proteins bound by the patch unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Quantified LARG catalytic specificity and power, establishing it as RhoA/B/C-specific with the highest reported Dbl-family GEF activity and an N-terminal DH region engaging GDP-bound RhoA.\",\n      \"evidence\": \"In vitro kinetic nucleotide-exchange assays with substrate-specificity panel and comparative DH analysis\",\n      \"pmids\": [\"21454492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the N-terminal regulatory region not solved here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified Fyn as the upstream kinase activating LARG under integrin tensional force, defining a mechanotransduction pathway distinct from GEF-H1/FAK-Ras-ERK.\",\n      \"evidence\": \"Magnetic twisting cytometry, GEF activation assays, siRNA, Co-IP and atomic force microscopy\",\n      \"pmids\": [\"21572419\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Fyn phosphosites on LARG not mapped\", \"How force is transduced to Fyn-LARG not fully defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed Gαq-coupled receptors activate LARG via its DH-PH tandem independently of PLCβ, broadening LARG's upstream Gα repertoire beyond G12/13.\",\n      \"evidence\": \"Co-IP, SRF reporter, dominant-active Gαq, siRNA and receptor pharmacology\",\n      \"pmids\": [\"22100544\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct Gαq-LARG binding interface undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established NIS as a binding partner that sequesters LARG at the plasma membrane to modulate RhoA-dependent motility and invasion.\",\n      \"evidence\": \"Co-IP, migration/invasion assays, NIS localization manipulation\",\n      \"pmids\": [\"22962269\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding interface not mapped\", \"Single lab; physiological relevance limited to specific contexts\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked LARG to angiotensin II/AT1R-driven vascular contraction through the RhoA/MYPT1 axis, supporting its role in vascular tone.\",\n      \"evidence\": \"siRNA, RhoA activity and MYPT1 phosphorylation Western blots, isometric contraction\",\n      \"pmids\": [\"23123644\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct receptor-LARG coupling step not shown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided definitive genetic proof that LARG, redundantly with PDZ-RhoGEF and p115, is required for Gα12/13-to-Rho signaling and embryonic development.\",\n      \"evidence\": \"Single/double/triple knockout mice and MEF signaling assays (RhoA-GTP, JNK/p38)\",\n      \"pmids\": [\"23467409\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Non-redundant LARG-specific functions in development not isolated here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified a cytokinesis function, localizing LARG to the central spindle and midbody and showing it is required specifically for abscission.\",\n      \"evidence\": \"siRNA, live imaging, immunofluorescence colocalization with tubulin/RhoA, rescue, Aurora-B inhibition\",\n      \"pmids\": [\"23885121\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Recruitment mechanism to the midbody unknown\", \"Relationship to Aurora-B abscission checkpoint not fully defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established CYLD as a deubiquitinase that activates LARG, adding ubiquitin removal as a regulatory layer controlling exchange activity and cell polarity.\",\n      \"evidence\": \"Co-IP, ubiquitination/deubiquitination assays, RhoA-GTP pulldown, cytoskeletal phenotyping\",\n      \"pmids\": [\"23405219\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin sites on LARG not mapped\", \"E3 ligase that ubiquitinates LARG unidentified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended LARG mechanotransduction to endothelial ICAM-1, showing it drives RhoA-mediated stiffening required for leukocyte crawling and transendothelial migration.\",\n      \"evidence\": \"Magnetic twisting cytometry on ICAM-1, siRNA, RhoA pulldown, TEM and traction force assays\",\n      \"pmids\": [\"24585879\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ICAM-1-LARG coupling not shown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed TGF-β/ALK5-driven EMT degrades LARG (and GEF-H1) via the proteasome, reducing stiffness and the mechanical stiffening response while promoting invasion.\",\n      \"evidence\": \"TGF-β treatment, proteasome inhibition, siRNA, magnetic twisting cytometry, invasion assays\",\n      \"pmids\": [\"25143398\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase mediating LARG degradation unidentified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated inflammatory JNK signaling upregulates LARG expression to sustain RhoA/Rho-kinase-driven smooth muscle hypercontraction.\",\n      \"evidence\": \"siRNA, JNK inhibitor, Western blot, Rho kinase activity and contraction assays\",\n      \"pmids\": [\"24740538\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcriptional mechanism of LARG induction not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established Cdk1 as a mitotic kinase that phosphorylates LARG at Ser190/Ser1176 to suppress its GEF activity, providing cell-cycle control of RhoA activation.\",\n      \"evidence\": \"In vitro Cdk1 kinase assay, phosphospecific antibodies, phosphonull/phosphomimetic mutants, RhoA activity assay, immunofluorescence\",\n      \"pmids\": [\"26483157\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of phospho-inhibition unknown\", \"Coordination with abscission role not reconciled\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Confirmed in vivo that LARG is required for C-RGMa/Rho/ROCK-mediated axon layer targeting in the developing tectum.\",\n      \"evidence\": \"Dominant-negative LARG in chick tectum via in ovo electroporation and axon projection analysis\",\n      \"pmids\": [\"26292756\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dominant-negative approach; endogenous LARG loss-of-function not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified RSK2 as a kinase that binds and phosphorylates LARG at Ser1288 to activate RhoA/RhoB-dependent migration and invasion.\",\n      \"evidence\": \"Co-IP, in vitro kinase assay, RhoA-GTP pulldown, site-directed mutagenesis, migration/invasion assays\",\n      \"pmids\": [\"29279389\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Membrane translocation mechanism not yet defined (addressed later)\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed LARG in the DC-SIGN signalosome facilitating HIV-1 internalization in dendritic cells, with cocaine enhancing complex assembly.\",\n      \"evidence\": \"Co-IP, HIV-1 internalization and trafficking imaging, siRNA\",\n      \"pmids\": [\"28094782\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DC-SIGN-LARG interaction not isolated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established LARG as the primary mediator of mechanical strain-induced RhoA activation in mesenchymal stem cell lineage commitment, restraining adipogenesis.\",\n      \"evidence\": \"siRNA, RhoA-GTP pulldown, mechanical strain, adipogenesis/osteogenesis assays\",\n      \"pmids\": [\"29208526\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream strain sensor coupling to LARG not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated LARG is required for IL17A-induced airway smooth muscle contractility and airway hyperresponsiveness in vivo, independent of inflammation.\",\n      \"evidence\": \"Arhgef12-KO mice, tracheal ring contraction, RhoA activation, house dust mite allergen model\",\n      \"pmids\": [\"30385725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"IL17A receptor-to-LARG coupling mechanism undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Confirmed G12/13-LARG-RhoA signaling is required for pressure-induced myogenic vasoconstriction and systemic vascular resistance.\",\n      \"evidence\": \"Smooth muscle-specific conditional LARG knockout mice, pressure myography, RhoA activity and Ca2+ measurements\",\n      \"pmids\": [\"31549965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular pressure sensor upstream of LARG not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended LARG function to erythropoiesis, showing it regulates erythroid differentiation through a RhoA/p38 pathway.\",\n      \"evidence\": \"Zebrafish morpholino/CRISPR KO, p38 assay, RhoA/p38 rescue, K562 and 32D differentiation assays\",\n      \"pmids\": [\"31467124\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Link between RhoA and p38 in this context not mechanistically detailed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed a context-specific switch in which endothelial LARG selectively activates Rap1A (not Rho GTPases) to maintain tight-junction barrier integrity under TNF challenge.\",\n      \"evidence\": \"Cell-free GEF assay with immunoprecipitated ArhGEF12, active-GEF pulldown, TEER and tight junction staining\",\n      \"pmids\": [\"35294066\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural determinant of the RhoA-vs-Rap1A switch unknown\", \"Single lab; unexpected substrate specificity\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Positioned LARG as the molecular link coupling Rac activity to RhoA activation at cell protrusions/retractions during migration.\",\n      \"evidence\": \"FRET Rho GTPase biosensors, optogenetic Rac activation, siRNA, live migration analysis\",\n      \"pmids\": [\"38102112\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Rac-dependent membrane recruitment of LARG not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined the RSK2-LARG axis by showing Ser1288 phosphorylation drives LARG membrane translocation and LARG-RhoA complex assembly downstream of EGF in glioblastoma.\",\n      \"evidence\": \"Phosphospecific antibodies, membrane fractionation, Co-IP, RhoA-GTP pulldown, EGF stimulation in patient-derived GBM cells\",\n      \"pmids\": [\"41338458\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Membrane anchor recognizing phospho-LARG not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified Solo as a partner maintaining LARG activity at cell-substrate adhesions for substrate-stiffness-dependent actin remodeling.\",\n      \"evidence\": \"BioID, Co-IP, siRNA, live imaging, actin polymerization and traction-force assays\",\n      \"pmids\": [\"41739636\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs proximity interaction not fully resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Linked an ARHGEF12 E620K mutation to oncogenic Rap1 activation, ITGA6 upregulation, and pro-metastatic exosome-driven fibroblast education in ovarian cancer.\",\n      \"evidence\": \"Ectopic E620K expression, in vitro migration/invasion/colony assays, xenograft, Rap1 assay, exosome characterization, fibroblast co-culture\",\n      \"pmids\": [\"40860157\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How E620K shifts substrate preference toward Rap1 not structurally defined\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis governing LARG's substrate switch between RhoA-subfamily GTPases and Rap1A, and how the converging regulatory inputs (oligomerization, phosphorylation, ubiquitination, partner binding) are integrated on a single molecule, remain unresolved.\",\n      \"evidence\": \"No discovery in the corpus provides a unifying structural or quantitative model of LARG regulatory integration\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of full-length regulated LARG\", \"Determinants of RhoA-vs-Rap1A specificity unknown\", \"Hierarchy among competing regulatory inputs undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 5, 23, 25]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1, 12, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [12, 15, 33]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [4, 23]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [7, 18, 35]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 14, 17]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [6, 28, 29]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [18, 23]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [17, 24, 30]}\n    ],\n    \"complexes\": [\"DC-SIGN signalosome\"],\n    \"partners\": [\"RHOA\", \"PLXNB1\", \"DIAPH1\", \"RSK2\", \"CYLD\", \"FYN\", \"GNA13\", \"PCNT\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}