{"gene":"RHOG","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2003,"finding":"RhoG interacts directly with Elmo in a GTP-dependent manner and forms a ternary complex with Dock180 to induce activation of Rac1. This RhoG-Elmo-Dock180 pathway is required for integrin-mediated Rac1 activation and cell spreading, as well as NGF-induced neurite outgrowth.","method":"Co-immunoprecipitation, pulldown assays, dominant-negative and constitutively active mutant expression, cell spreading and neurite outgrowth assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays, GTP-dependence demonstrated, functional rescue experiments, widely replicated across multiple subsequent studies","pmids":["12879077"],"is_preprint":false},{"year":1998,"finding":"Constitutively active RhoG produces cytoskeletal changes (ruffles, lamellipodia, filopodia, microvilli) similar to simultaneous activation of Rac1 and Cdc42Hs. RhoG does not directly interact with Rac1/Cdc42 effectors PAK-1, POR1, or WASP, but requires endogenous Rac1 and Cdc42 activities. RhoG's morphogenic activity requires the microtubule network, and microtubule depolymerization reverses the RhoG phenotype.","method":"GFP-fusion protein expression, dominant-negative co-expression epistasis, nocodazole treatment, immunofluorescence microscopy","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (epistasis with dominant negatives, pharmacological perturbation, localization), replicated in subsequent work","pmids":["9614181"],"is_preprint":false},{"year":2000,"finding":"Trio's N-terminal GEF domain (TrioGEF1/TrioD1) directly activates RhoG with higher in vitro GEF activity on RhoG than on Rac1. In fibroblasts, dominant-negative RhoG abolishes TrioD1 signaling, and TrioD1 requires the microtubule network and relocalizes RhoG to active plasma membrane sites.","method":"In vitro nucleotide exchange assay, dominant-negative mutant epistasis, immunofluorescence, nocodazole treatment","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro exchange assay plus cell-based epistasis, replicated across multiple labs","pmids":["10652265"],"is_preprint":false},{"year":2000,"finding":"Trio GEFD1 interacts through its PH domain with the actin-filament-crosslinking protein filamin. Trio GEFD1 induces actin-based ruffling in filamin-expressing but not filamin-deficient cells, or cells transfected with filamin lacking the Trio-binding domain. Filamin binding does not affect Trio GEFD1 exchange activity.","method":"Co-immunoprecipitation, pulldown, filamin-deficient cell reconstitution, actin ruffle assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding plus functional reconstitution in filamin-null cells with domain mutants","pmids":["11146652"],"is_preprint":false},{"year":2001,"finding":"Kinectin is identified as a RhoG effector: RhoG(GTP) specifically interacts with the central domain of kinectin. RhoG, kinectin, and kinesin colocalize in the endoplasmic reticulum and lysosomes. RhoG morphogenic activity requires kinectin interaction and kinesin activity. RhoG activation facilitates microtubule-dependent lysosomal transport via kinectin.","method":"Yeast two-hybrid screen, co-precipitation, antibody injection to block interaction, time-lapse videomicroscopy, immunofluorescence","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid plus co-precipitation plus antibody blocking plus functional readout with multiple orthogonal approaches in single study","pmids":["11689693"],"is_preprint":false},{"year":1996,"finding":"RhoGDI-3 is a GDP dissociation inhibitor that specifically interacts with both GDP- and GTP-bound forms of RhoB and RhoG (but not RhoA, RhoC, or Rac1). RhoGDI-3 inhibits GDP/GTP exchange of RhoB and releases GDP-bound but not GTP-bound RhoB from cell membranes. Unlike other GDIs, RhoGDI-3 associates with a detergent-insoluble membranous/cytoskeletal fraction.","method":"Yeast two-hybrid, in vitro GDP/GTP exchange inhibition assay, membrane fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro exchange assay plus two-hybrid plus fractionation, multiple orthogonal methods","pmids":["8939998"],"is_preprint":false},{"year":2002,"finding":"RhoGDI-3 inhibits activation of RhoG and targets RhoG to the Golgi apparatus. The unique N-terminal amphipathic alpha-helix of RhoGDI-3 mediates Golgi association and is required for both Golgi targeting and stability of the cytoplasmic RhoG/RhoGDI-3 complex.","method":"Confocal microscopy, immuno-isolation, RhoGDI-3 N-terminal domain mutants, GFP-targeting experiments","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple complementary methods (site-directed mutations, GFP targeting, GDI activity assays) in a single study","pmids":["11967128"],"is_preprint":false},{"year":2004,"finding":"RhoG (and its C. elegans ortholog MIG-2) functions upstream of ELMO/CED-12 in a conserved signaling module (TRIO/UNC-73 → RhoG/MIG-2 → ELMO/CED-12 → Dock180 → Rac) required for phagocytosis of apoptotic cells. Armadillo (ARM) repeats within CED-12/ELMO mediate direct interaction with activated MIG-2/RhoG.","method":"Genetic epistasis in C. elegans, mammalian cell engulfment assays, GST pulldowns, domain mapping","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo C. elegans epistasis combined with in vitro binding and mammalian cell functional assays, replicated across two organisms","pmids":["15620647"],"is_preprint":false},{"year":2004,"finding":"SGEF is a GEF that specifically activates RhoG but not Rac1 or Rac3. Recombinant SGEF DH/PH domain exchanges nucleotide on RhoG in vitro. SGEF-induced dorsal ruffles are morphologically similar to those from constitutively active RhoG, and both SGEF and RhoG stimulate macropinocytosis (dextran uptake), requiring a catalytically active DH domain.","method":"In vitro nucleotide exchange assay, scanning electron microscopy, dextran uptake assay, dominant-negative and catalytic-dead mutants","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with specificity controls plus multiple functional assays","pmids":["15133129"],"is_preprint":false},{"year":2004,"finding":"The crystal structure of the TrioN (GEFD1) DH/PH domain was determined to 1.7 Å resolution. In vitro exchange experiments show RhoG is ~3× more efficiently exchanged than Rac by TrioN; residues 54 and 69 (not conserved between RhoG and Rac) determine this specificity. The RhoG C-terminal basic tail enables TrioN-PH domain binding to PtdIns(3,4)P2 with micromolar affinity, a function not seen with Rac.","method":"X-ray crystallography, in vitro nucleotide exchange assay, dot-blot phospholipid binding, surface plasmon resonance/affinity binding","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus in vitro biochemical assays with mutagenesis-derived specificity mapping","pmids":["15199069"],"is_preprint":false},{"year":2005,"finding":"RhoG promotes cell migration via the ELMO-Dock180 pathway to activate Rac1 and form lamellipodia at the leading edge. RNAi knockdown of RhoG in HeLa cells reduces Rac1 activation, lamellipodia formation, and migration. Active RhoG promotes migration through ELMO and Dock180, but Dock180-Crk interaction is dispensable for this effect.","method":"RNAi knockdown, scratch-wound and Transwell migration assays, Rac1 activation pulldown assay, dominant-negative/active mutant epistasis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi loss-of-function with specific pathway rescue, multiple orthogonal readouts","pmids":["16339170"],"is_preprint":false},{"year":2002,"finding":"RhoG activates Rac1 and Cdc42 downstream of NGF/Ras to mediate neurite outgrowth in PC12 cells. Dominant-negative Rac1 or Cdc42 inhibits RhoG-induced neurite outgrowth; constitutively active RhoG elevates endogenous Rac1 and Cdc42 activities. Dominant-negative RhoG suppresses both NGF-induced and Ras-induced neurite outgrowth.","method":"Transient expression of constitutively active/dominant-negative mutants, Rac1/Cdc42 activity assays, epistasis analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistatic relationships established with multiple GTPase mutants, Rac/Cdc42 activity measurements, replicated in subsequent studies","pmids":["10982854"],"is_preprint":false},{"year":2002,"finding":"Trio GEFD1 acts upstream of RhoG in the NGF pathway to induce neurite outgrowth in PC12 cells. The spectrin repeats and SH3-1 domain of Trio are required for GEFD1-mediated neurite outgrowth. Trio protein levels increase upon NGF stimulation.","method":"Dominant-negative RhoG epistasis, Trio domain deletion mutants, PC12 neurite outgrowth assays","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain deletion analysis and epistasis in single lab, functional readout confirmed","pmids":["11864571"],"is_preprint":false},{"year":2002,"finding":"Vav2 and (to a lesser extent) Dbs activate RhoG in vitro. RhoG interacts in a GTP-dependent manner with IQGAP2, MLK-3, and PLD1, but not PAKs, POSH, WASP, Par-6, or IRSp53. Activated RhoG stimulates JNK and Akt but not SRF or NF-κB. Dominant-negative Rac1 does not inhibit lamellipodia induced by activated RhoG, suggesting RhoG can signal independently of Rac1.","method":"In vitro GEF exchange assays, GTP-dependent pulldown assays, JNK/Akt/SRF/NF-κB reporter assays, tat-Rac1(17N) transduction","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 / Moderate — in vitro exchange assays plus GTP-dependent effector binding plus signaling readouts, multiple orthogonal methods in single study","pmids":["12376551"],"is_preprint":false},{"year":2002,"finding":"Constitutively active Rac1 and RhoG (but not RhoA or Cdc42) protect cells from UV-induced apoptosis. This anti-apoptotic effect is independent of NF-κB but requires direct interaction of RhoG (and Rac1) with PI3K and stimulation of Akt. RhoG also activates JNK through a separate pathway.","method":"Expression of constitutively active GTPase mutants, apoptosis assays, PI3K co-immunoprecipitation, Akt phosphorylation assays, NF-κB reporter","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional rescue assays, single lab, multiple readouts","pmids":["11803464"],"is_preprint":false},{"year":2007,"finding":"RhoG is activated downstream of ICAM1 engagement in endothelial cells, requiring the intracellular domain of ICAM1. ICAM1 colocalizes with RhoG and binds to the RhoG-specific GEF SGEF via SGEF's SH3 domain. RhoG depletion by siRNA decreases endothelial cup formation and inhibits leukocyte trans-endothelial migration (TEM) without affecting leukocyte adhesion. SGEF silencing also reduces RhoG activity, cup formation, and TEM.","method":"siRNA knockdown, RhoG activation assay, co-immunoprecipitation (ICAM1-SGEF), confocal microscopy, TEM assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus siRNA KD with specific functional readout, multiple orthogonal methods","pmids":["17875742"],"is_preprint":false},{"year":2007,"finding":"PLEKHG6 is a RhoG-specific GEF recruited by ezrin to the apical pole of epithelial cells. PLEKHG6 activates RhoG (and to lesser extent Rac1). Ezrin forms a ternary complex with PLEKHG6 and RhoG, and also with PLEKHG6 and the RhoG effector ELMO. Both PLEKHG6 and ezrin are required for macropinocytosis (dextran uptake) downstream of EGF.","method":"Co-immunoprecipitation, dominant-negative RhoG epistasis, dextran uptake assays, siRNA knockdown","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, GEF specificity demonstrated, functional RNAi knockdown with defined readout, multiple methods in single study","pmids":["17881735"],"is_preprint":false},{"year":2006,"finding":"RhoG depletion impairs GPCR agonist (C5a/fMLP)-stimulated NADPH oxidase activity and oxidant generation in neutrophils. Loss of RhoG causes early, transient reduction of Rac1 and Rac2 activation by fMLP. Chemotaxis and other signaling events (PKB phosphorylation, p38MAPK, PLD activation, calcium flux) are unaffected.","method":"RhoG knockout mice, NADPH oxidase activity assay, Rac1/Rac2 activation pulldown assay, chemotaxis assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with specific functional readouts and pathway dissection","pmids":["16621998"],"is_preprint":false},{"year":2006,"finding":"Dock4 is regulated by RhoG through ELMO: active RhoG induces translocation of the Dock4-ELMO complex from cytoplasm to the plasma membrane and enhances Dock4/ELMO-dependent Rac1 activation and cell migration.","method":"Co-immunoprecipitation, subcellular fractionation/localization, Rac1 activation pulldown assay, RNAi knockdown, migration assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, localization change, and functional assays in single lab","pmids":["17027967"],"is_preprint":false},{"year":2009,"finding":"RhoG is maintained in an inactive state by a ternary complex of syndecan-4 (S4), synectin, and RhoGDI1. PKCα phosphorylates RhoGDI1 at Ser96 upon S4 clustering, releasing RhoG and leading to polarized Rac1 activation. This pathway is downstream of FGF2 signaling for angiogenesis.","method":"Co-immunoprecipitation (ternary complex), phosphorylation site mutation, Rac1 activation assays, siRNA knockdown, endothelial migration assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ternary complex co-IP, phospho-site mutagenesis, and functional assays with multiple orthogonal methods","pmids":["19581409"],"is_preprint":false},{"year":2010,"finding":"Ephexin4 is a GEF for RhoG that interacts with EphA2. Ligand-independent EphA2 activates RhoG via Ephexin4, which recruits ELMO2 and Dock4 to form a complex with EphA2 at cortactin-rich protrusion tips. Dock4-mediated Rac activation downstream of this pathway promotes breast cancer cell migration and invasion.","method":"siRNA knockdown/rescue experiments, co-immunoprecipitation, RhoG and Rac activity assays, invasion/migration assays, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockdown-rescue epistasis, co-IP, GTPase activation assays, multiple orthogonal methods","pmids":["20679435"],"is_preprint":false},{"year":2010,"finding":"EGF stimulation causes rapid, strong activation of endogenous RhoG in epithelial cells, mediated by Vav family GEFs (and in some cell types PLEKHG6). RhoG activation after EGF is independent of Rac1 activation. RhoG has roles in EGF-stimulated cell migration and EGF receptor internalization.","method":"RhoG nucleotide-free pulldown assay, siRNA knockdown of Vav/PLEKHG6, EGF receptor internalization assay, migration assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific pulldown assay for endogenous RhoG, siRNA knockdown of GEFs, single lab","pmids":["20237158"],"is_preprint":false},{"year":2011,"finding":"TC21 (RRas2) co-translocates with the TCR to the immunological synapse and drives TCR internalization via a RhoG-dependent phagocytic mechanism. RhoG is required for TCR-triggered phagocytosis of beads and uptake of MHC from antigen-presenting cells.","method":"siRNA knockdown, phagocytosis assays (1–6 μm beads), TCR internalization assays, live-cell imaging","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA KD with multiple functional readouts, mechanistic epistasis with TC21, orthogonal phagocytosis assays","pmids":["21820331"],"is_preprint":false},{"year":2011,"finding":"Syndecan-4 binding by fibronectin triggers PKCα-dependent RhoG activation, leading to dynamin- and caveolin-dependent α5β1-integrin endocytosis. Genetic disruption of RhoG in mice retards dermal wound closure due to defective migration of fibroblasts and keratinocytes.","method":"Atomic force microscopy (cell avidity), co-immunoprecipitation, RhoG knockout mouse model, wound healing assay, integrin internalization assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with in vivo wound healing phenotype plus mechanistic co-IP and integrin trafficking assay","pmids":["21982645"],"is_preprint":false},{"year":2011,"finding":"RhoG is required for particle uptake through both FcγR and CR3 in macrophages, demonstrated by RNAi screen. RhoG is recruited and activated at phagocytic cups downstream of both receptors. Unexpectedly, RhoG connects to RhoA signaling downstream of CR3.","method":"RNAi screen (20 Rho GTPases individually depleted), phagocytosis assays, RhoG recruitment/activation at phagocytic cups","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic RNAi screen with specific phagocytosis readouts, activation localization assay","pmids":["21878497"],"is_preprint":false},{"year":2011,"finding":"The RhoG/ELMO1/Dock180 signaling module is required for dendritic spine morphogenesis in hippocampal neurons. Depletion of Dock180 inhibits spine formation; ELMO1 acts with Dock180 in a complex to activate Rac GTPase for this process; RhoG functions upstream of the ELMO1/Dock180 complex in spine formation.","method":"RNAi screen of 70 Rho GEFs, siRNA knockdown, overexpression, Rac GTPase activation assay, confocal microscopy","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi screen plus pathway epistasis, single lab","pmids":["21900250"],"is_preprint":false},{"year":2011,"finding":"Ephexin4-mediated RhoG activation is required for resistance to anoikis (suspension-induced apoptosis) downstream of EphA2. Knockdown of Ephexin4 decreases RhoG activity and Akt phosphorylation in suspended cells; rescue requires active RhoG and PI3K/Akt.","method":"siRNA knockdown/rescue, RhoG activity assay, Akt phosphorylation assay, anoikis assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown-rescue with pathway dissection, single lab","pmids":["21621533"],"is_preprint":false},{"year":2012,"finding":"miR-124 suppresses RhoG expression in neurons, and RhoG inhibits dendritic branching via ELMO/Dock180/Rac1 signaling and inhibits axonal branching in a Cdc42-dependent manner. miR-124 directly targets the RhoG 3'UTR to regulate neuronal process complexity.","method":"miRNA overexpression/knockdown, RhoG siRNA, dominant-negative GTPase epistasis, hippocampal neuron morphometry in vitro and in vivo","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function in vitro and in vivo, pathway epistasis with multiple GTPases, miRNA target validation","pmids":["22588079"],"is_preprint":false},{"year":2012,"finding":"RhoG mediates glioblastoma cell invasion through brain slices. RhoG is activated by HGF and EGF. Depletion of RhoG strongly inhibits Rac1 activation by both growth factors and impairs lamellipodia and invadopodia formation.","method":"siRNA depletion, ex vivo brain slice invasion assay, Rac1 activation pulldown, lamellipodia/invadopodia imaging","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with mechanistic pathway placement, single lab","pmids":["22966858"],"is_preprint":false},{"year":2013,"finding":"RhoG is expressed in platelets and activated by collagen-related peptide (CRP) via a Src family kinase-dependent, Syk- and PI3K-independent mechanism. RhoG deficiency impairs GPVI-specific granule secretion (α-granules, dense granules, lysosomes) and integrin activation, leading to reduced thrombus formation in vivo. RhoG function is GPVI-specific and does not affect thrombin signaling.","method":"RhoG knockout mice, platelet aggregation assay, granule secretion assay, integrin activation assay, in vivo thrombosis model, kinase inhibitor studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple specific functional assays and in vivo readout","pmids":["24106270","24106269"],"is_preprint":false},{"year":2014,"finding":"P-Rex1 acts as a GEF for RhoG (in addition to Rac1) both in vitro and in GPCR-stimulated primary mouse neutrophils. Loss of P-Rex1 or RhoG causes equivalent reductions in GPCR-driven Rac activation and NADPH oxidase activity. RhoG loss impairs GPCR-driven DOCK2 recruitment and F-actin polarization to the leading edge, placing RhoG upstream of DOCK2-mediated Rac activation in neutrophils.","method":"In vitro GEF exchange assay, RhoG knockout mice, Rac activation assay, NADPH oxidase assay, DOCK2 localization by immunofluorescence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — in vitro GEF assay plus genetic KO plus mechanistic epistasis with DOCK2 recruitment","pmids":["24659802"],"is_preprint":false},{"year":2015,"finding":"Anillin is recruited to the leading edge by active RhoG (MIG-2) in C. elegans Q neuroblasts. The active form of RhoG/MIG-2 directly binds to Anillin. Anillin stabilizes F-actin at the leading edge by antagonizing Cofilin-mediated severing, transducing the RhoG signal to the actin cytoskeleton during neuronal migration and neurite growth.","method":"CRISPR-Cas9 conditional mutations, live imaging, biochemical F-actin stabilization assay, direct binding assay (RhoG–Anillin), C. elegans neuronal migration assay","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding plus in vivo CRISPR genetics plus biochemical actin assay","pmids":["25843030"],"is_preprint":false},{"year":2015,"finding":"ELMO2 simultaneously binds ILK and RhoG, forming a tripartite ERI complex. In differentiated keratinocytes, ERI complexes (independently of integrins) promote microtubule stability via Rac1-dependent phosphorylation and inactivation of stathmin and GSK-3β/CRMP2.","method":"Co-immunoprecipitation, Ilk gene inactivation (KO), microtubule dynamics imaging, RhoG/ELMO2 overexpression, Rac1 activity assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus genetic KO plus functional microtubule assays, single lab","pmids":["25995380"],"is_preprint":false},{"year":2007,"finding":"RhoG regulates anoikis through a PI3K-dependent mechanism independent of ELMO/Dock180-mediated Rac1 activation. Constitutively active RhoG binds to the PI3K regulatory subunit p85α and induces PI3K-dependent Akt phosphorylation to suppress anoikis.","method":"RNAi knockdown, co-immunoprecipitation (RhoG–p85α), Akt phosphorylation assay, anoikis assay, constitutively active/dominant-negative mutant epistasis","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with p85α plus functional anoikis assay with pathway dissection, single lab","pmids":["17570359"],"is_preprint":false},{"year":2017,"finding":"RhoG and its GEF SGEF regulate invadopodia disassembly in breast cancer cells. Silencing RhoG or SGEF stabilizes invadopodia (longer lifetime). RhoG and Rac1 have independent and opposing roles in invadopodia dynamics. RhoG/SGEF modulate paxillin phosphorylation, a key step in invadopodia disassembly.","method":"siRNA knockdown, live-cell invadopodia assay (lifetime measurement), paxillin phosphorylation immunoblot","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with specific invadopodia dynamics readout and paxillin phosphorylation, single lab","pmids":["28202690"],"is_preprint":false},{"year":2017,"finding":"RhoG and its exchange factor Trio regulate circular dorsal ruffle (CDR) dynamics, macropinocytosis, and receptor internalization downstream of PDGF in a PI3K- and Src-dependent manner. RhoG regulation of CDR area is independent of Rac1.","method":"siRNA knockdown, CDR area quantification, macropinocytosis (dextran uptake) assay, receptor internalization assay, signaling inhibitor experiments","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with mechanistic dissection, single lab","pmids":["28468978"],"is_preprint":false},{"year":2019,"finding":"RhoG modulates focal adhesion (FA) dynamics: RhoG silencing increases FA stability, number, size, and maturity, and increases stress fiber thickness and contractility. RhoG plays a role in microtubule-mediated FA disassembly.","method":"siRNA knockdown, live-cell FA dynamics imaging (TIRF), blebbistatin treatment, immunofluorescence","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with live imaging FA dynamics, single lab","pmids":["30914742"],"is_preprint":false},{"year":2021,"finding":"Biallelic loss-of-function mutations in RHOG in a patient cause hemophagocytic lymphohistiocytosis (HLH) due to impaired cytotoxic granule (CG) exocytosis. RhoG retains CGs in the vicinity of the plasma membrane. RhoG directly interacts with Munc13-4, an exocytosis factor essential for CG fusion; this interaction is required for docking of Munc13-4+ CGs to the plasma membrane and subsequent membrane fusion and CG content release.","method":"Patient genetic analysis, RHOG ablation in cell lines and primary CTLs, CG exocytosis assay, proximity to plasma membrane assay, co-immunoprecipitation (RhoG–Munc13-4)","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — human patient genetics plus experimental KO plus direct protein-protein interaction plus functional exocytosis assay, multiple orthogonal methods","pmids":["33513601"],"is_preprint":false},{"year":2016,"finding":"Tyrosine phosphorylation of SGEF at Y530 (within the DH domain) by Src suppresses SGEF interaction with RhoG, reduces RhoG activity elevation, and inhibits SGEF-mediated cell migration. The Y530F mutation blocks the inhibitory effect of Src.","method":"Site-directed mutagenesis, kinase assay, co-immunoprecipitation, RhoG activity assay, migration assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phospho-site mutagenesis with functional rescue, single lab","pmids":["27437949"],"is_preprint":false},{"year":2018,"finding":"Ephexin4 undergoes autoinhibition through an intermolecular interaction that impedes RhoG binding to Ephexin4. A mutation at E295A (in the intermolecular interaction region) disrupts autoinhibition, increases RhoG binding, augments RhoG activation, and increases phagocytosis of apoptotic cells.","method":"Ephexin4 oligomerization mutant analysis, co-immunoprecipitation, RhoG activation assay, phagocytosis assay","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus binding assay plus functional readout, single lab","pmids":["30445756"],"is_preprint":false},{"year":2024,"finding":"Cryo-EM structures of DOCK5/ELMO1 alone and in complex with RhoG and Rac1 reveal that RhoG binds both ELMO1 and DOCK5, facilitating a closed-to-open conformational transition in DOCK5/ELMO1. RhoG binding enhances the Rac GEF activity of DOCK5/ELMO1 and increases its binding affinity for Rac1 (confirmed by SPR). The DOCK5 phosphatidylinositol(3,4,5)-trisphosphate binding site aligns with the RhoG C-terminal lipidation site, suggesting simultaneous plasma membrane binding.","method":"Cryo-EM structure determination, in vitro Rac GEF activity assay, surface plasmon resonance (SPR), biochemical binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure plus in vitro reconstituted GEF assay plus SPR binding, multiple orthogonal methods in single study","pmids":["38857861"],"is_preprint":false},{"year":2009,"finding":"Yersinia enterocolitica Invasin activates RhoG at bacterial contact sites to promote cell invasion, while the type III effector YopE (acting as a GAP) deactivates RhoG. YopE localizes to Golgi/ER, which determines its RhoG specificity. RhoG and Elmo/Dock180 control both Rac1 activation by Invasin and Rac1 deactivation by YopE.","method":"FRET-based RhoG biosensor, siRNA knockdown, bacterial invasion assay, YopE GAP activity assay, confocal microscopy","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — FRET biosensor spatial activation mapping plus siRNA KD plus bacterial invasion functional assay, multiple orthogonal methods","pmids":["19208761"],"is_preprint":false},{"year":2009,"finding":"Y. pseudotuberculosis Invasin recruits RhoG to bacterial attachment sites via high-affinity beta1-integrin association. YopE (a GAP) efficiently inactivates RhoG. YopT (a prenylcysteine endoprotease) mislocalizes RhoG. RhoG activation can bypass a deficit in Rac1 activity for bacterial internalization.","method":"FRET-based RhoG activation biosensor, siRNA knockdown, bacterial internalization assay, fluorescence microscopy","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET biosensor plus functional internalization assay, single lab","pmids":["19720752"],"is_preprint":false},{"year":2009,"finding":"RhoG promotes neural progenitor cell (NPC) proliferation in the ventricular zone during cortical development. Active RhoG promotes BrdU incorporation and Ki67 positivity; RhoG knockdown suppresses these. RhoG-induced proliferation requires PI3K activity but not ELMO interaction.","method":"In utero electroporation, RNAi knockdown, constitutively active RhoG, BrdU/Ki67 assays, PI3K inhibitor and ELMO binding mutant epistasis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro KD/OE with pathway dissection (ELMO-independent, PI3K-dependent), single lab","pmids":["19812248"],"is_preprint":false},{"year":2024,"finding":"Ephexin4 is phosphorylated at Ser41 specifically during M phase. This phosphorylation is required for RhoG localization to the plasma membrane, chromosome alignment, and normal M-phase progression. Loss of Ephexin4 or the S41A phospho-dead mutant causes chromosome misalignment via spindle assembly checkpoint activation (BubR1 at kinetochores). Phospho-mimic S41E mutant enhances active RhoG levels.","method":"Ephexin4 knockdown/rescue with phospho mutants, chromosome alignment assay, BubR1 localization, RhoG activity assay, MDCK cyst morphogenesis assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phospho-site mutagenesis with functional rescue in multiple cell-based assays, single lab","pmids":["39675713"],"is_preprint":false},{"year":2026,"finding":"Using a photoactivatable RhoG, a RhoG biosensor, and simultaneous two-GTPase visualization, RhoG activation was shown to unidirectionally activate Rac1 in cell protrusions. RhoG activates Rac1 predominantly through DOCK180. RhoG also independently activates Cdc42 independently of Rac1. Specific aspects of protrusion behavior are controlled by RhoG beyond those mediated through Rac1.","method":"Optogenetics (photoactivatable RhoG), FRET biosensors (RhoG, Rac1), causal inference analysis, live-cell protrusion imaging, DOCK180 epistasis","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — optogenetic activation plus biosensor imaging plus causal inference, multiple orthogonal tools in single study (preprint)","pmids":["42182105"],"is_preprint":true}],"current_model":"RhoG is a Rho-family GTPase that acts as a molecular switch, activated by GEFs including Trio/TrioGEF1, SGEF, Ephexin4, P-Rex1, Vav2, PLEKHG6, and Kalirin; it signals primarily through GTP-dependent binding to ELMO, driving a closed-to-open conformational change in the ELMO/DOCK complex (DOCK180, DOCK4, DOCK5) to activate Rac1—as demonstrated by cryo-EM and in vitro GEF assays—while also activating Cdc42 and, in specific contexts, engaging kinectin/kinesin for microtubule-dependent vesicle transport, PI3K/Akt for cell survival, and Munc13-4 for cytotoxic granule docking; it controls cell migration, phagocytosis, apoptotic cell clearance, neurite outgrowth, dendritic spine morphogenesis, integrin endocytosis, platelet granule secretion, and leukocyte trans-endothelial migration, and is restrained by RhoGDI-3 (which targets it to the Golgi) and by a syndecan-4/synectin/RhoGDI1 ternary complex that is released by PKCα phosphorylation."},"narrative":{"mechanistic_narrative":"RHOG is a Rho-family GTPase that functions as a signaling switch coupling upstream receptor and GEF inputs to Rac1- and Cdc42-driven actin remodeling, governing cell migration, phagocytosis, apoptotic-cell clearance, and membrane trafficking [PMID:9614181, PMID:16339170, PMID:42182105]. Its canonical output is the activation of Rac1 through a conserved module in which GTP-bound RhoG binds ELMO directly and forms a ternary complex with DOCK180-family GEFs (DOCK180, DOCK4, DOCK5), an arrangement required for integrin-mediated spreading, growth-factor-induced neurite outgrowth, lamellipodial migration, and dendritic spine morphogenesis [PMID:12879077, PMID:15620647, PMID:16339170, PMID:17027967, PMID:21900250]; cryo-EM of DOCK5/ELMO1 shows RhoG contacts both ELMO1 and DOCK5 to drive a closed-to-open transition that enhances Rac GEF activity, with the RhoG lipidation site aligning to the DOCK5 phosphoinositide-binding site for coincident membrane engagement [PMID:38857861]. RhoG is loaded by multiple specific GEFs—Trio, SGEF, Ephexin4, P-Rex1, Vav2, and PLEKHG6—that connect it to distinct receptors and locales including ICAM1, EphA2, and ezrin-organized apical membrane [PMID:10652265, PMID:15133129, PMID:12376551, PMID:17875742, PMID:17881735, PMID:20679435, PMID:24659802], and it is restrained by RhoGDI-3, which targets it to the Golgi, and by a syndecan-4/synectin/RhoGDI1 complex released upon PKCα phosphorylation [PMID:8939998, PMID:11967128, PMID:19581409]. Beyond the ELMO/DOCK axis, RhoG signals independently of Rac1 by binding the PI3K regulatory subunit p85α to stimulate Akt and suppress anoikis [PMID:17570359], engages kinectin for microtubule- and kinesin-dependent lysosomal transport [PMID:11689693], and binds Munc13-4 to dock cytotoxic granules for exocytosis [PMID:33513601]. RhoG operates in phagocytosis through FcγR, CR3, and TCR-coupled uptake, in leukocyte trans-endothelial migration and NADPH oxidase activation, and is exploited by Yersinia Invasin (and inactivated by the effector YopE) during bacterial invasion [PMID:17875742, PMID:16621998, PMID:21820331, PMID:21878497, PMID:19208761]. Biallelic loss-of-function mutations in RHOG cause hemophagocytic lymphohistiocytosis through defective cytotoxic granule exocytosis [PMID:33513601].","teleology":[{"year":1996,"claim":"Establishing how RhoG is held inactive defined its regulatory boundaries before its effectors were known, identifying a dedicated GDI with unusual membrane association.","evidence":"Yeast two-hybrid, in vitro GDP/GTP exchange inhibition, and membrane fractionation identifying RhoGDI-3 binding to RhoB and RhoG","pmids":["8939998"],"confidence":"High","gaps":["Did not define RhoG's downstream effectors","Specificity for RhoG versus RhoB regulation in vivo not resolved"]},{"year":1998,"claim":"Demonstrating that active RhoG phenocopies combined Rac1/Cdc42 activation but acts through them rather than their direct effectors placed RhoG upstream as a hierarchical regulator of the other GTPases.","evidence":"GFP-fusion expression, dominant-negative epistasis, and nocodazole microtubule depolymerization in cultured cells","pmids":["9614181"],"confidence":"High","gaps":["Molecular link between RhoG and Rac1/Cdc42 activation unidentified","Microtubule dependence mechanistically unexplained"]},{"year":2000,"claim":"Identifying Trio's N-terminal GEF domain as a RhoG-preferring exchange factor provided the first defined upstream activator and a route to the cytoskeleton via filamin.","evidence":"In vitro nucleotide exchange assays, cell-based epistasis, and filamin-deficient cell reconstitution","pmids":["10652265","11146652"],"confidence":"High","gaps":["Receptor inputs activating Trio not defined","Effector linking RhoG to actin still unknown at this stage"]},{"year":2001,"claim":"Identification of kinectin as a GTP-dependent RhoG effector explained RhoG's microtubule requirement, linking it to kinesin-driven organelle transport.","evidence":"Yeast two-hybrid, co-precipitation, antibody injection, and time-lapse imaging of lysosomal transport","pmids":["11689693"],"confidence":"High","gaps":["Relationship between kinectin output and Rac1/Cdc42 activation unresolved","Not connected to a specific receptor pathway"]},{"year":2002,"claim":"Placing RhoG within NGF/Ras-driven neurite outgrowth and identifying Vav2/p85α/Akt and PI3K-dependent survival outputs revealed both the Rac/Cdc42 and Rac-independent branches of RhoG signaling.","evidence":"Constitutive/dominant-negative GTPase epistasis, GTP-dependent effector pulldowns, PI3K co-IP, and Akt/JNK/apoptosis assays","pmids":["10982854","11864571","12376551","11803464"],"confidence":"High","gaps":["Direct effector for the Rac1-independent lamellipodia output not defined","Physiological GEF coupling for survival signaling unclear"]},{"year":2002,"claim":"Defining how RhoGDI-3 targets RhoG to the Golgi via its N-terminal amphipathic helix established spatial control of RhoG inactivation.","evidence":"Confocal microscopy, immuno-isolation, and N-terminal domain mutagenesis with GFP-targeting","pmids":["11967128"],"confidence":"High","gaps":["Signal releasing RhoG from the Golgi pool not identified","Functional consequence of Golgi sequestration in vivo unaddressed"]},{"year":2004,"claim":"Establishing the conserved TRIO→RhoG→ELMO→DOCK180→Rac module across worm and mammal, with SGEF as a RhoG-specific GEF and a crystal structure rationalizing Trio's RhoG preference, crystallized the core RhoG signaling pathway.","evidence":"C. elegans genetic epistasis, mammalian engulfment assays, GST pulldowns/domain mapping, in vitro exchange with specificity mutants, and X-ray crystallography of TrioN DH/PH","pmids":["12879077","15620647","15133129","15199069"],"confidence":"High","gaps":["Structural basis of the RhoG-ELMO-DOCK ternary complex not yet resolved","Membrane recruitment dynamics of the complex undefined"]},{"year":2005,"claim":"Loss-of-function knockdown demonstrated that endogenous RhoG drives Rac1 activation, lamellipodia, and migration through ELMO/DOCK180, confirming the pathway's requirement rather than mere sufficiency.","evidence":"RNAi in HeLa cells with migration assays, Rac1 activation pulldowns, and pathway rescue","pmids":["16339170"],"confidence":"High","gaps":["Crk-independence of DOCK180 in this context not mechanistically explained"]},{"year":2006,"claim":"Knockout and screen-based studies showed RhoG controls neutrophil NADPH oxidase activity and engages DOCK4/ELMO, extending the module to innate immune effector functions and a second DOCK GEF.","evidence":"RhoG knockout mice with oxidase/Rac activation assays, and co-IP plus localization for DOCK4","pmids":["16621998","17027967"],"confidence":"High","gaps":["Why Rac1/Rac2 reduction is transient unexplained","Selectivity between DOCK180 and DOCK4 across cell types unresolved"]},{"year":2007,"claim":"Linking RhoG to ICAM1/SGEF in endothelium, ezrin/PLEKHG6 at the apical pole, and a Rac-independent p85α/PI3K survival pathway connected RhoG to receptor-proximal recruitment and anoikis resistance.","evidence":"siRNA knockdown, reciprocal co-IP, TEM and macropinocytosis assays, and RhoG-p85α co-IP with anoikis assays","pmids":["17875742","17881735","17570359"],"confidence":"High","gaps":["How distinct GEFs partition RhoG between Rac-dependent and PI3K-dependent outputs unclear","Direct structural basis of RhoG-p85α binding not determined"]},{"year":2009,"claim":"Defining the syndecan-4/synectin/RhoGDI1 brake released by PKCα, a proliferation role requiring PI3K but not ELMO, and pathogen hijacking of RhoG by Yersinia revealed both physiological regulation and exploitation of the switch.","evidence":"Ternary-complex co-IP with phospho-site mutagenesis, in utero electroporation with PI3K/ELMO epistasis, and FRET biosensors with bacterial invasion assays","pmids":["19581409","19812248","19208761","19720752"],"confidence":"High","gaps":["Effectors mediating ELMO-independent proliferation undefined","How YopE Golgi/ER localization confers RhoG specificity not fully resolved"]},{"year":2011,"claim":"A burst of loss-of-function and in vivo studies established RhoG as a broad mediator of phagocytic uptake (FcγR, CR3, TCR), integrin endocytosis, dendritic spine formation, and EphA2/Ephexin4-driven invasion and anoikis resistance.","evidence":"RNAi screens, RhoG knockout mice with wound-healing and integrin trafficking assays, phagocytosis and spine morphometry, and knockdown-rescue epistasis","pmids":["21820331","21982645","21878497","21900250","20679435","21621533","20237158"],"confidence":"High","gaps":["Mechanism connecting RhoG to RhoA downstream of CR3 unexplained","How a single GTPase coordinates such diverse receptor inputs spatially undefined"]},{"year":2013,"claim":"miR-124 control of RhoG expression and platelet GPVI-specific functions showed transcript-level regulation and receptor-restricted physiological roles in neuronal complexity and granule secretion/thrombosis.","evidence":"miRNA target validation with neuron morphometry, and RhoG knockout mice with platelet aggregation, granule secretion, and in vivo thrombosis assays","pmids":["22588079","24106270","24106269"],"confidence":"High","gaps":["GPVI-proximal mechanism coupling Src-family kinases to RhoG activation incomplete","Effector mediating granule secretion at this stage unidentified"]},{"year":2014,"claim":"Identifying P-Rex1 as a RhoG GEF placing RhoG upstream of DOCK2 in neutrophils, and Anillin and the ELMO2/ILK (ERI) complex as effectors, broadened the effector repertoire to actin-stabilizing and microtubule-stabilizing outputs.","evidence":"In vitro GEF assays with knockout mice, DOCK2 localization, direct RhoG-Anillin binding with CRISPR genetics, and ERI co-IP with microtubule dynamics imaging","pmids":["24659802","25843030","25995380"],"confidence":"High","gaps":["Coordination between DOCK2 and DOCK180/ELMO recruitment by RhoG unresolved","ERI complex role across non-keratinocyte tissues untested"]},{"year":2017,"claim":"Studies of invadopodia disassembly, focal adhesion dynamics, and PDGF-driven dorsal ruffles refined RhoG's roles in turnover of adhesive and protrusive structures, often opposing or independent of Rac1.","evidence":"siRNA knockdown with live-cell invadopodia/FA imaging, paxillin phosphorylation immunoblot, and macropinocytosis/internalization assays with signaling inhibitors","pmids":["28202690","28468978","30914742"],"confidence":"Medium","gaps":["Effectors mediating Rac1-independent FA and CDR control not identified","Findings from single labs without cross-system replication"]},{"year":2021,"claim":"Discovery of biallelic RHOG loss-of-function in a patient with HLH and a direct RhoG-Munc13-4 interaction tied RhoG to cytotoxic granule docking and human disease.","evidence":"Patient genetics, RHOG ablation in CTLs, CG exocytosis and plasma-membrane proximity assays, and RhoG-Munc13-4 co-IP","pmids":["33513601"],"confidence":"High","gaps":["Whether Munc13-4 docking requires the ELMO/DOCK axis or is independent unresolved","Structural basis of RhoG-Munc13-4 binding undetermined"]},{"year":2024,"claim":"Cryo-EM of DOCK5/ELMO1 with RhoG and Rac1, plus an M-phase Ephexin4 phosphorylation event, provided the structural mechanism of RhoG-driven DOCK activation and a cell-cycle-coupled regulatory layer.","evidence":"Cryo-EM with in vitro Rac GEF and SPR assays, and Ephexin4 phospho-mutant rescue with chromosome alignment and RhoG activity assays","pmids":["38857861","39675713"],"confidence":"High","gaps":["Structures of RhoG with DOCK180 or DOCK4 not determined","In vivo relevance of the M-phase RhoG localization pathway untested"]},{"year":2026,"claim":"Optogenetic and dual-biosensor causal analysis directly demonstrated that RhoG unidirectionally activates Rac1 via DOCK180 and independently activates Cdc42, resolving the causal hierarchy among the GTPases.","evidence":"Photoactivatable RhoG, FRET biosensors, causal inference, and DOCK180 epistasis in live cells (preprint)","pmids":["42182105"],"confidence":"High","gaps":["Effectors for the Cdc42-independent protrusion outputs unidentified","Preprint not yet peer-reviewed"]},{"year":null,"claim":"How RhoG selects among its many GEFs, effectors, and Rac-dependent versus Rac-independent outputs in a given cellular context remains the central unresolved question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of context-dependent effector choice","Structural basis of RhoG-p85α, RhoG-kinectin, and RhoG-Munc13-4 binding undetermined","Mechanism converting upstream GEF identity into distinct downstream programs unknown"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,18,20,24,37]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[6,41]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6,19]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,13,20]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[17,22,24,30,37]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[4,8,23,35]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[37,41]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[11,25,27,43]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[14,33,26]}],"complexes":["RhoG-ELMO-DOCK180 complex","syndecan-4/synectin/RhoGDI1 ternary complex","ELMO2-ILK-RhoG (ERI) complex"],"partners":["ELMO1","DOCK180","DOCK5","TRIO","SGEF","EPHEXIN4","KINECTIN","MUNC13-4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P84095","full_name":"Rho-related GTP-binding protein RhoG","aliases":[],"length_aa":191,"mass_kda":21.3,"function":"Plays a role in immunological synaptic F-actin density and architecture organization (PubMed:33513601). Regulates actin reorganization in lymphocytes, possibly through the modulation of Rac1 activity (PubMed:33513601). Required for the formation of membrane ruffles during macropinocytosis (PubMed:15133129). Plays a role in cell migration and is required for the formation of cup-like structures during trans-endothelial migration of leukocytes (PubMed:17875742). Binds phospholipids in an activation-dependent manner; thereby acting as an anchor for other proteins to the plasma membrane (PM) (PubMed:33513601). Plays a role in exocytosis of cytotoxic granules (CG) by lymphocytes/Component of the exocytosis machinery in natural killer (NK) and CD8+ T cells (PubMed:33513601). Promotes the docking of cytotoxic granules (CG) to the plasma membrane through the interaction with UNC13D (PubMed:33513601). Involved in the cytotoxic activity of lymphocytes/primary CD8+ T cells (PubMed:33513601) (Microbial infection) In case of Salmonella enterica infection, activated by SopB and ARHGEF26/SGEF, which induces cytoskeleton rearrangements and promotes bacterial entry","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P84095/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RHOG","classification":"Not Classified","n_dependent_lines":23,"n_total_lines":1208,"dependency_fraction":0.01903973509933775},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000177105","cell_line_id":"CID000611","localizations":[{"compartment":"membrane","grade":3},{"compartment":"er","grade":2}],"interactors":[{"gene":"ARHGDIA","stoichiometry":0.2},{"gene":"RAC1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000611","total_profiled":1310},"omim":[{"mim_id":"619335","title":"GRANULE-ASSOCIATED RAC AND RHOG EFFECTOR 1; GARRE1","url":"https://www.omim.org/entry/619335"},{"mim_id":"618871","title":"RHO GUANINE NUCLEOTIDE EXCHANGE FACTOR 16; ARHGEF16","url":"https://www.omim.org/entry/618871"},{"mim_id":"617552","title":"RHO GUANINE NUCLEOTIDE EXCHANGE FACTOR 26; ARHGEF26","url":"https://www.omim.org/entry/617552"},{"mim_id":"617368","title":"SH3 DOMAIN-BINDING PROTEIN 1; SH3BP1","url":"https://www.omim.org/entry/617368"},{"mim_id":"612115","title":"RHO GUANINE NUCLEOTIDE EXCHANGE FACTOR 3; ARHGEF3","url":"https://www.omim.org/entry/612115"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":257.8}],"url":"https://www.proteinatlas.org/search/RHOG"},"hgnc":{"alias_symbol":["MGC125835","MGC125836"],"prev_symbol":["ARHG"]},"alphafold":{"accession":"P84095","domains":[{"cath_id":"3.40.50.300","chopping":"2-172","consensus_level":"high","plddt":96.8014,"start":2,"end":172}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P84095","model_url":"https://alphafold.ebi.ac.uk/files/AF-P84095-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P84095-F1-predicted_aligned_error_v6.png","plddt_mean":93.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RHOG","jax_strain_url":"https://www.jax.org/strain/search?query=RHOG"},"sequence":{"accession":"P84095","fasta_url":"https://rest.uniprot.org/uniprotkb/P84095.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P84095/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P84095"}},"corpus_meta":[{"pmid":"12879077","id":"PMC_12879077","title":"RhoG activates Rac1 by 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This RhoG-Elmo-Dock180 pathway is required for integrin-mediated Rac1 activation and cell spreading, as well as NGF-induced neurite outgrowth.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, dominant-negative and constitutively active mutant expression, cell spreading and neurite outgrowth assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays, GTP-dependence demonstrated, functional rescue experiments, widely replicated across multiple subsequent studies\",\n      \"pmids\": [\"12879077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Constitutively active RhoG produces cytoskeletal changes (ruffles, lamellipodia, filopodia, microvilli) similar to simultaneous activation of Rac1 and Cdc42Hs. RhoG does not directly interact with Rac1/Cdc42 effectors PAK-1, POR1, or WASP, but requires endogenous Rac1 and Cdc42 activities. RhoG's morphogenic activity requires the microtubule network, and microtubule depolymerization reverses the RhoG phenotype.\",\n      \"method\": \"GFP-fusion protein expression, dominant-negative co-expression epistasis, nocodazole treatment, immunofluorescence microscopy\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (epistasis with dominant negatives, pharmacological perturbation, localization), replicated in subsequent work\",\n      \"pmids\": [\"9614181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Trio's N-terminal GEF domain (TrioGEF1/TrioD1) directly activates RhoG with higher in vitro GEF activity on RhoG than on Rac1. In fibroblasts, dominant-negative RhoG abolishes TrioD1 signaling, and TrioD1 requires the microtubule network and relocalizes RhoG to active plasma membrane sites.\",\n      \"method\": \"In vitro nucleotide exchange assay, dominant-negative mutant epistasis, immunofluorescence, nocodazole treatment\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro exchange assay plus cell-based epistasis, replicated across multiple labs\",\n      \"pmids\": [\"10652265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Trio GEFD1 interacts through its PH domain with the actin-filament-crosslinking protein filamin. Trio GEFD1 induces actin-based ruffling in filamin-expressing but not filamin-deficient cells, or cells transfected with filamin lacking the Trio-binding domain. Filamin binding does not affect Trio GEFD1 exchange activity.\",\n      \"method\": \"Co-immunoprecipitation, pulldown, filamin-deficient cell reconstitution, actin ruffle assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding plus functional reconstitution in filamin-null cells with domain mutants\",\n      \"pmids\": [\"11146652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Kinectin is identified as a RhoG effector: RhoG(GTP) specifically interacts with the central domain of kinectin. RhoG, kinectin, and kinesin colocalize in the endoplasmic reticulum and lysosomes. RhoG morphogenic activity requires kinectin interaction and kinesin activity. RhoG activation facilitates microtubule-dependent lysosomal transport via kinectin.\",\n      \"method\": \"Yeast two-hybrid screen, co-precipitation, antibody injection to block interaction, time-lapse videomicroscopy, immunofluorescence\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid plus co-precipitation plus antibody blocking plus functional readout with multiple orthogonal approaches in single study\",\n      \"pmids\": [\"11689693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"RhoGDI-3 is a GDP dissociation inhibitor that specifically interacts with both GDP- and GTP-bound forms of RhoB and RhoG (but not RhoA, RhoC, or Rac1). RhoGDI-3 inhibits GDP/GTP exchange of RhoB and releases GDP-bound but not GTP-bound RhoB from cell membranes. Unlike other GDIs, RhoGDI-3 associates with a detergent-insoluble membranous/cytoskeletal fraction.\",\n      \"method\": \"Yeast two-hybrid, in vitro GDP/GTP exchange inhibition assay, membrane fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro exchange assay plus two-hybrid plus fractionation, multiple orthogonal methods\",\n      \"pmids\": [\"8939998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RhoGDI-3 inhibits activation of RhoG and targets RhoG to the Golgi apparatus. The unique N-terminal amphipathic alpha-helix of RhoGDI-3 mediates Golgi association and is required for both Golgi targeting and stability of the cytoplasmic RhoG/RhoGDI-3 complex.\",\n      \"method\": \"Confocal microscopy, immuno-isolation, RhoGDI-3 N-terminal domain mutants, GFP-targeting experiments\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple complementary methods (site-directed mutations, GFP targeting, GDI activity assays) in a single study\",\n      \"pmids\": [\"11967128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RhoG (and its C. elegans ortholog MIG-2) functions upstream of ELMO/CED-12 in a conserved signaling module (TRIO/UNC-73 → RhoG/MIG-2 → ELMO/CED-12 → Dock180 → Rac) required for phagocytosis of apoptotic cells. Armadillo (ARM) repeats within CED-12/ELMO mediate direct interaction with activated MIG-2/RhoG.\",\n      \"method\": \"Genetic epistasis in C. elegans, mammalian cell engulfment assays, GST pulldowns, domain mapping\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo C. elegans epistasis combined with in vitro binding and mammalian cell functional assays, replicated across two organisms\",\n      \"pmids\": [\"15620647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SGEF is a GEF that specifically activates RhoG but not Rac1 or Rac3. Recombinant SGEF DH/PH domain exchanges nucleotide on RhoG in vitro. SGEF-induced dorsal ruffles are morphologically similar to those from constitutively active RhoG, and both SGEF and RhoG stimulate macropinocytosis (dextran uptake), requiring a catalytically active DH domain.\",\n      \"method\": \"In vitro nucleotide exchange assay, scanning electron microscopy, dextran uptake assay, dominant-negative and catalytic-dead mutants\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with specificity controls plus multiple functional assays\",\n      \"pmids\": [\"15133129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The crystal structure of the TrioN (GEFD1) DH/PH domain was determined to 1.7 Å resolution. In vitro exchange experiments show RhoG is ~3× more efficiently exchanged than Rac by TrioN; residues 54 and 69 (not conserved between RhoG and Rac) determine this specificity. The RhoG C-terminal basic tail enables TrioN-PH domain binding to PtdIns(3,4)P2 with micromolar affinity, a function not seen with Rac.\",\n      \"method\": \"X-ray crystallography, in vitro nucleotide exchange assay, dot-blot phospholipid binding, surface plasmon resonance/affinity binding\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus in vitro biochemical assays with mutagenesis-derived specificity mapping\",\n      \"pmids\": [\"15199069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RhoG promotes cell migration via the ELMO-Dock180 pathway to activate Rac1 and form lamellipodia at the leading edge. RNAi knockdown of RhoG in HeLa cells reduces Rac1 activation, lamellipodia formation, and migration. Active RhoG promotes migration through ELMO and Dock180, but Dock180-Crk interaction is dispensable for this effect.\",\n      \"method\": \"RNAi knockdown, scratch-wound and Transwell migration assays, Rac1 activation pulldown assay, dominant-negative/active mutant epistasis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi loss-of-function with specific pathway rescue, multiple orthogonal readouts\",\n      \"pmids\": [\"16339170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RhoG activates Rac1 and Cdc42 downstream of NGF/Ras to mediate neurite outgrowth in PC12 cells. Dominant-negative Rac1 or Cdc42 inhibits RhoG-induced neurite outgrowth; constitutively active RhoG elevates endogenous Rac1 and Cdc42 activities. Dominant-negative RhoG suppresses both NGF-induced and Ras-induced neurite outgrowth.\",\n      \"method\": \"Transient expression of constitutively active/dominant-negative mutants, Rac1/Cdc42 activity assays, epistasis analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistatic relationships established with multiple GTPase mutants, Rac/Cdc42 activity measurements, replicated in subsequent studies\",\n      \"pmids\": [\"10982854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Trio GEFD1 acts upstream of RhoG in the NGF pathway to induce neurite outgrowth in PC12 cells. The spectrin repeats and SH3-1 domain of Trio are required for GEFD1-mediated neurite outgrowth. Trio protein levels increase upon NGF stimulation.\",\n      \"method\": \"Dominant-negative RhoG epistasis, Trio domain deletion mutants, PC12 neurite outgrowth assays\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain deletion analysis and epistasis in single lab, functional readout confirmed\",\n      \"pmids\": [\"11864571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Vav2 and (to a lesser extent) Dbs activate RhoG in vitro. RhoG interacts in a GTP-dependent manner with IQGAP2, MLK-3, and PLD1, but not PAKs, POSH, WASP, Par-6, or IRSp53. Activated RhoG stimulates JNK and Akt but not SRF or NF-κB. Dominant-negative Rac1 does not inhibit lamellipodia induced by activated RhoG, suggesting RhoG can signal independently of Rac1.\",\n      \"method\": \"In vitro GEF exchange assays, GTP-dependent pulldown assays, JNK/Akt/SRF/NF-κB reporter assays, tat-Rac1(17N) transduction\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Moderate — in vitro exchange assays plus GTP-dependent effector binding plus signaling readouts, multiple orthogonal methods in single study\",\n      \"pmids\": [\"12376551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Constitutively active Rac1 and RhoG (but not RhoA or Cdc42) protect cells from UV-induced apoptosis. This anti-apoptotic effect is independent of NF-κB but requires direct interaction of RhoG (and Rac1) with PI3K and stimulation of Akt. RhoG also activates JNK through a separate pathway.\",\n      \"method\": \"Expression of constitutively active GTPase mutants, apoptosis assays, PI3K co-immunoprecipitation, Akt phosphorylation assays, NF-κB reporter\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional rescue assays, single lab, multiple readouts\",\n      \"pmids\": [\"11803464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RhoG is activated downstream of ICAM1 engagement in endothelial cells, requiring the intracellular domain of ICAM1. ICAM1 colocalizes with RhoG and binds to the RhoG-specific GEF SGEF via SGEF's SH3 domain. RhoG depletion by siRNA decreases endothelial cup formation and inhibits leukocyte trans-endothelial migration (TEM) without affecting leukocyte adhesion. SGEF silencing also reduces RhoG activity, cup formation, and TEM.\",\n      \"method\": \"siRNA knockdown, RhoG activation assay, co-immunoprecipitation (ICAM1-SGEF), confocal microscopy, TEM assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus siRNA KD with specific functional readout, multiple orthogonal methods\",\n      \"pmids\": [\"17875742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PLEKHG6 is a RhoG-specific GEF recruited by ezrin to the apical pole of epithelial cells. PLEKHG6 activates RhoG (and to lesser extent Rac1). Ezrin forms a ternary complex with PLEKHG6 and RhoG, and also with PLEKHG6 and the RhoG effector ELMO. Both PLEKHG6 and ezrin are required for macropinocytosis (dextran uptake) downstream of EGF.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative RhoG epistasis, dextran uptake assays, siRNA knockdown\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, GEF specificity demonstrated, functional RNAi knockdown with defined readout, multiple methods in single study\",\n      \"pmids\": [\"17881735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RhoG depletion impairs GPCR agonist (C5a/fMLP)-stimulated NADPH oxidase activity and oxidant generation in neutrophils. Loss of RhoG causes early, transient reduction of Rac1 and Rac2 activation by fMLP. Chemotaxis and other signaling events (PKB phosphorylation, p38MAPK, PLD activation, calcium flux) are unaffected.\",\n      \"method\": \"RhoG knockout mice, NADPH oxidase activity assay, Rac1/Rac2 activation pulldown assay, chemotaxis assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with specific functional readouts and pathway dissection\",\n      \"pmids\": [\"16621998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Dock4 is regulated by RhoG through ELMO: active RhoG induces translocation of the Dock4-ELMO complex from cytoplasm to the plasma membrane and enhances Dock4/ELMO-dependent Rac1 activation and cell migration.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation/localization, Rac1 activation pulldown assay, RNAi knockdown, migration assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, localization change, and functional assays in single lab\",\n      \"pmids\": [\"17027967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RhoG is maintained in an inactive state by a ternary complex of syndecan-4 (S4), synectin, and RhoGDI1. PKCα phosphorylates RhoGDI1 at Ser96 upon S4 clustering, releasing RhoG and leading to polarized Rac1 activation. This pathway is downstream of FGF2 signaling for angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation (ternary complex), phosphorylation site mutation, Rac1 activation assays, siRNA knockdown, endothelial migration assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ternary complex co-IP, phospho-site mutagenesis, and functional assays with multiple orthogonal methods\",\n      \"pmids\": [\"19581409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ephexin4 is a GEF for RhoG that interacts with EphA2. Ligand-independent EphA2 activates RhoG via Ephexin4, which recruits ELMO2 and Dock4 to form a complex with EphA2 at cortactin-rich protrusion tips. Dock4-mediated Rac activation downstream of this pathway promotes breast cancer cell migration and invasion.\",\n      \"method\": \"siRNA knockdown/rescue experiments, co-immunoprecipitation, RhoG and Rac activity assays, invasion/migration assays, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockdown-rescue epistasis, co-IP, GTPase activation assays, multiple orthogonal methods\",\n      \"pmids\": [\"20679435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"EGF stimulation causes rapid, strong activation of endogenous RhoG in epithelial cells, mediated by Vav family GEFs (and in some cell types PLEKHG6). RhoG activation after EGF is independent of Rac1 activation. RhoG has roles in EGF-stimulated cell migration and EGF receptor internalization.\",\n      \"method\": \"RhoG nucleotide-free pulldown assay, siRNA knockdown of Vav/PLEKHG6, EGF receptor internalization assay, migration assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific pulldown assay for endogenous RhoG, siRNA knockdown of GEFs, single lab\",\n      \"pmids\": [\"20237158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TC21 (RRas2) co-translocates with the TCR to the immunological synapse and drives TCR internalization via a RhoG-dependent phagocytic mechanism. RhoG is required for TCR-triggered phagocytosis of beads and uptake of MHC from antigen-presenting cells.\",\n      \"method\": \"siRNA knockdown, phagocytosis assays (1–6 μm beads), TCR internalization assays, live-cell imaging\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA KD with multiple functional readouts, mechanistic epistasis with TC21, orthogonal phagocytosis assays\",\n      \"pmids\": [\"21820331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Syndecan-4 binding by fibronectin triggers PKCα-dependent RhoG activation, leading to dynamin- and caveolin-dependent α5β1-integrin endocytosis. Genetic disruption of RhoG in mice retards dermal wound closure due to defective migration of fibroblasts and keratinocytes.\",\n      \"method\": \"Atomic force microscopy (cell avidity), co-immunoprecipitation, RhoG knockout mouse model, wound healing assay, integrin internalization assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with in vivo wound healing phenotype plus mechanistic co-IP and integrin trafficking assay\",\n      \"pmids\": [\"21982645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RhoG is required for particle uptake through both FcγR and CR3 in macrophages, demonstrated by RNAi screen. RhoG is recruited and activated at phagocytic cups downstream of both receptors. Unexpectedly, RhoG connects to RhoA signaling downstream of CR3.\",\n      \"method\": \"RNAi screen (20 Rho GTPases individually depleted), phagocytosis assays, RhoG recruitment/activation at phagocytic cups\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic RNAi screen with specific phagocytosis readouts, activation localization assay\",\n      \"pmids\": [\"21878497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The RhoG/ELMO1/Dock180 signaling module is required for dendritic spine morphogenesis in hippocampal neurons. Depletion of Dock180 inhibits spine formation; ELMO1 acts with Dock180 in a complex to activate Rac GTPase for this process; RhoG functions upstream of the ELMO1/Dock180 complex in spine formation.\",\n      \"method\": \"RNAi screen of 70 Rho GEFs, siRNA knockdown, overexpression, Rac GTPase activation assay, confocal microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi screen plus pathway epistasis, single lab\",\n      \"pmids\": [\"21900250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Ephexin4-mediated RhoG activation is required for resistance to anoikis (suspension-induced apoptosis) downstream of EphA2. Knockdown of Ephexin4 decreases RhoG activity and Akt phosphorylation in suspended cells; rescue requires active RhoG and PI3K/Akt.\",\n      \"method\": \"siRNA knockdown/rescue, RhoG activity assay, Akt phosphorylation assay, anoikis assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown-rescue with pathway dissection, single lab\",\n      \"pmids\": [\"21621533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"miR-124 suppresses RhoG expression in neurons, and RhoG inhibits dendritic branching via ELMO/Dock180/Rac1 signaling and inhibits axonal branching in a Cdc42-dependent manner. miR-124 directly targets the RhoG 3'UTR to regulate neuronal process complexity.\",\n      \"method\": \"miRNA overexpression/knockdown, RhoG siRNA, dominant-negative GTPase epistasis, hippocampal neuron morphometry in vitro and in vivo\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function in vitro and in vivo, pathway epistasis with multiple GTPases, miRNA target validation\",\n      \"pmids\": [\"22588079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RhoG mediates glioblastoma cell invasion through brain slices. RhoG is activated by HGF and EGF. Depletion of RhoG strongly inhibits Rac1 activation by both growth factors and impairs lamellipodia and invadopodia formation.\",\n      \"method\": \"siRNA depletion, ex vivo brain slice invasion assay, Rac1 activation pulldown, lamellipodia/invadopodia imaging\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with mechanistic pathway placement, single lab\",\n      \"pmids\": [\"22966858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RhoG is expressed in platelets and activated by collagen-related peptide (CRP) via a Src family kinase-dependent, Syk- and PI3K-independent mechanism. RhoG deficiency impairs GPVI-specific granule secretion (α-granules, dense granules, lysosomes) and integrin activation, leading to reduced thrombus formation in vivo. RhoG function is GPVI-specific and does not affect thrombin signaling.\",\n      \"method\": \"RhoG knockout mice, platelet aggregation assay, granule secretion assay, integrin activation assay, in vivo thrombosis model, kinase inhibitor studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple specific functional assays and in vivo readout\",\n      \"pmids\": [\"24106270\", \"24106269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"P-Rex1 acts as a GEF for RhoG (in addition to Rac1) both in vitro and in GPCR-stimulated primary mouse neutrophils. Loss of P-Rex1 or RhoG causes equivalent reductions in GPCR-driven Rac activation and NADPH oxidase activity. RhoG loss impairs GPCR-driven DOCK2 recruitment and F-actin polarization to the leading edge, placing RhoG upstream of DOCK2-mediated Rac activation in neutrophils.\",\n      \"method\": \"In vitro GEF exchange assay, RhoG knockout mice, Rac activation assay, NADPH oxidase assay, DOCK2 localization by immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — in vitro GEF assay plus genetic KO plus mechanistic epistasis with DOCK2 recruitment\",\n      \"pmids\": [\"24659802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Anillin is recruited to the leading edge by active RhoG (MIG-2) in C. elegans Q neuroblasts. The active form of RhoG/MIG-2 directly binds to Anillin. Anillin stabilizes F-actin at the leading edge by antagonizing Cofilin-mediated severing, transducing the RhoG signal to the actin cytoskeleton during neuronal migration and neurite growth.\",\n      \"method\": \"CRISPR-Cas9 conditional mutations, live imaging, biochemical F-actin stabilization assay, direct binding assay (RhoG–Anillin), C. elegans neuronal migration assay\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding plus in vivo CRISPR genetics plus biochemical actin assay\",\n      \"pmids\": [\"25843030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ELMO2 simultaneously binds ILK and RhoG, forming a tripartite ERI complex. In differentiated keratinocytes, ERI complexes (independently of integrins) promote microtubule stability via Rac1-dependent phosphorylation and inactivation of stathmin and GSK-3β/CRMP2.\",\n      \"method\": \"Co-immunoprecipitation, Ilk gene inactivation (KO), microtubule dynamics imaging, RhoG/ELMO2 overexpression, Rac1 activity assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus genetic KO plus functional microtubule assays, single lab\",\n      \"pmids\": [\"25995380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RhoG regulates anoikis through a PI3K-dependent mechanism independent of ELMO/Dock180-mediated Rac1 activation. Constitutively active RhoG binds to the PI3K regulatory subunit p85α and induces PI3K-dependent Akt phosphorylation to suppress anoikis.\",\n      \"method\": \"RNAi knockdown, co-immunoprecipitation (RhoG–p85α), Akt phosphorylation assay, anoikis assay, constitutively active/dominant-negative mutant epistasis\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with p85α plus functional anoikis assay with pathway dissection, single lab\",\n      \"pmids\": [\"17570359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RhoG and its GEF SGEF regulate invadopodia disassembly in breast cancer cells. Silencing RhoG or SGEF stabilizes invadopodia (longer lifetime). RhoG and Rac1 have independent and opposing roles in invadopodia dynamics. RhoG/SGEF modulate paxillin phosphorylation, a key step in invadopodia disassembly.\",\n      \"method\": \"siRNA knockdown, live-cell invadopodia assay (lifetime measurement), paxillin phosphorylation immunoblot\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with specific invadopodia dynamics readout and paxillin phosphorylation, single lab\",\n      \"pmids\": [\"28202690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RhoG and its exchange factor Trio regulate circular dorsal ruffle (CDR) dynamics, macropinocytosis, and receptor internalization downstream of PDGF in a PI3K- and Src-dependent manner. RhoG regulation of CDR area is independent of Rac1.\",\n      \"method\": \"siRNA knockdown, CDR area quantification, macropinocytosis (dextran uptake) assay, receptor internalization assay, signaling inhibitor experiments\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with mechanistic dissection, single lab\",\n      \"pmids\": [\"28468978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RhoG modulates focal adhesion (FA) dynamics: RhoG silencing increases FA stability, number, size, and maturity, and increases stress fiber thickness and contractility. RhoG plays a role in microtubule-mediated FA disassembly.\",\n      \"method\": \"siRNA knockdown, live-cell FA dynamics imaging (TIRF), blebbistatin treatment, immunofluorescence\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with live imaging FA dynamics, single lab\",\n      \"pmids\": [\"30914742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Biallelic loss-of-function mutations in RHOG in a patient cause hemophagocytic lymphohistiocytosis (HLH) due to impaired cytotoxic granule (CG) exocytosis. RhoG retains CGs in the vicinity of the plasma membrane. RhoG directly interacts with Munc13-4, an exocytosis factor essential for CG fusion; this interaction is required for docking of Munc13-4+ CGs to the plasma membrane and subsequent membrane fusion and CG content release.\",\n      \"method\": \"Patient genetic analysis, RHOG ablation in cell lines and primary CTLs, CG exocytosis assay, proximity to plasma membrane assay, co-immunoprecipitation (RhoG–Munc13-4)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human patient genetics plus experimental KO plus direct protein-protein interaction plus functional exocytosis assay, multiple orthogonal methods\",\n      \"pmids\": [\"33513601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tyrosine phosphorylation of SGEF at Y530 (within the DH domain) by Src suppresses SGEF interaction with RhoG, reduces RhoG activity elevation, and inhibits SGEF-mediated cell migration. The Y530F mutation blocks the inhibitory effect of Src.\",\n      \"method\": \"Site-directed mutagenesis, kinase assay, co-immunoprecipitation, RhoG activity assay, migration assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-site mutagenesis with functional rescue, single lab\",\n      \"pmids\": [\"27437949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Ephexin4 undergoes autoinhibition through an intermolecular interaction that impedes RhoG binding to Ephexin4. A mutation at E295A (in the intermolecular interaction region) disrupts autoinhibition, increases RhoG binding, augments RhoG activation, and increases phagocytosis of apoptotic cells.\",\n      \"method\": \"Ephexin4 oligomerization mutant analysis, co-immunoprecipitation, RhoG activation assay, phagocytosis assay\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus binding assay plus functional readout, single lab\",\n      \"pmids\": [\"30445756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryo-EM structures of DOCK5/ELMO1 alone and in complex with RhoG and Rac1 reveal that RhoG binds both ELMO1 and DOCK5, facilitating a closed-to-open conformational transition in DOCK5/ELMO1. RhoG binding enhances the Rac GEF activity of DOCK5/ELMO1 and increases its binding affinity for Rac1 (confirmed by SPR). The DOCK5 phosphatidylinositol(3,4,5)-trisphosphate binding site aligns with the RhoG C-terminal lipidation site, suggesting simultaneous plasma membrane binding.\",\n      \"method\": \"Cryo-EM structure determination, in vitro Rac GEF activity assay, surface plasmon resonance (SPR), biochemical binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure plus in vitro reconstituted GEF assay plus SPR binding, multiple orthogonal methods in single study\",\n      \"pmids\": [\"38857861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Yersinia enterocolitica Invasin activates RhoG at bacterial contact sites to promote cell invasion, while the type III effector YopE (acting as a GAP) deactivates RhoG. YopE localizes to Golgi/ER, which determines its RhoG specificity. RhoG and Elmo/Dock180 control both Rac1 activation by Invasin and Rac1 deactivation by YopE.\",\n      \"method\": \"FRET-based RhoG biosensor, siRNA knockdown, bacterial invasion assay, YopE GAP activity assay, confocal microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — FRET biosensor spatial activation mapping plus siRNA KD plus bacterial invasion functional assay, multiple orthogonal methods\",\n      \"pmids\": [\"19208761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Y. pseudotuberculosis Invasin recruits RhoG to bacterial attachment sites via high-affinity beta1-integrin association. YopE (a GAP) efficiently inactivates RhoG. YopT (a prenylcysteine endoprotease) mislocalizes RhoG. RhoG activation can bypass a deficit in Rac1 activity for bacterial internalization.\",\n      \"method\": \"FRET-based RhoG activation biosensor, siRNA knockdown, bacterial internalization assay, fluorescence microscopy\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET biosensor plus functional internalization assay, single lab\",\n      \"pmids\": [\"19720752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RhoG promotes neural progenitor cell (NPC) proliferation in the ventricular zone during cortical development. Active RhoG promotes BrdU incorporation and Ki67 positivity; RhoG knockdown suppresses these. RhoG-induced proliferation requires PI3K activity but not ELMO interaction.\",\n      \"method\": \"In utero electroporation, RNAi knockdown, constitutively active RhoG, BrdU/Ki67 assays, PI3K inhibitor and ELMO binding mutant epistasis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro KD/OE with pathway dissection (ELMO-independent, PI3K-dependent), single lab\",\n      \"pmids\": [\"19812248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Ephexin4 is phosphorylated at Ser41 specifically during M phase. This phosphorylation is required for RhoG localization to the plasma membrane, chromosome alignment, and normal M-phase progression. Loss of Ephexin4 or the S41A phospho-dead mutant causes chromosome misalignment via spindle assembly checkpoint activation (BubR1 at kinetochores). Phospho-mimic S41E mutant enhances active RhoG levels.\",\n      \"method\": \"Ephexin4 knockdown/rescue with phospho mutants, chromosome alignment assay, BubR1 localization, RhoG activity assay, MDCK cyst morphogenesis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-site mutagenesis with functional rescue in multiple cell-based assays, single lab\",\n      \"pmids\": [\"39675713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Using a photoactivatable RhoG, a RhoG biosensor, and simultaneous two-GTPase visualization, RhoG activation was shown to unidirectionally activate Rac1 in cell protrusions. RhoG activates Rac1 predominantly through DOCK180. RhoG also independently activates Cdc42 independently of Rac1. Specific aspects of protrusion behavior are controlled by RhoG beyond those mediated through Rac1.\",\n      \"method\": \"Optogenetics (photoactivatable RhoG), FRET biosensors (RhoG, Rac1), causal inference analysis, live-cell protrusion imaging, DOCK180 epistasis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — optogenetic activation plus biosensor imaging plus causal inference, multiple orthogonal tools in single study (preprint)\",\n      \"pmids\": [\"42182105\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RhoG is a Rho-family GTPase that acts as a molecular switch, activated by GEFs including Trio/TrioGEF1, SGEF, Ephexin4, P-Rex1, Vav2, PLEKHG6, and Kalirin; it signals primarily through GTP-dependent binding to ELMO, driving a closed-to-open conformational change in the ELMO/DOCK complex (DOCK180, DOCK4, DOCK5) to activate Rac1—as demonstrated by cryo-EM and in vitro GEF assays—while also activating Cdc42 and, in specific contexts, engaging kinectin/kinesin for microtubule-dependent vesicle transport, PI3K/Akt for cell survival, and Munc13-4 for cytotoxic granule docking; it controls cell migration, phagocytosis, apoptotic cell clearance, neurite outgrowth, dendritic spine morphogenesis, integrin endocytosis, platelet granule secretion, and leukocyte trans-endothelial migration, and is restrained by RhoGDI-3 (which targets it to the Golgi) and by a syndecan-4/synectin/RhoGDI1 ternary complex that is released by PKCα phosphorylation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RHOG is a Rho-family GTPase that functions as a signaling switch coupling upstream receptor and GEF inputs to Rac1- and Cdc42-driven actin remodeling, governing cell migration, phagocytosis, apoptotic-cell clearance, and membrane trafficking [#1, #10, #45]. Its canonical output is the activation of Rac1 through a conserved module in which GTP-bound RhoG binds ELMO directly and forms a ternary complex with DOCK180-family GEFs (DOCK180, DOCK4, DOCK5), an arrangement required for integrin-mediated spreading, growth-factor-induced neurite outgrowth, lamellipodial migration, and dendritic spine morphogenesis [#0, #7, #10, #18, #25]; cryo-EM of DOCK5/ELMO1 shows RhoG contacts both ELMO1 and DOCK5 to drive a closed-to-open transition that enhances Rac GEF activity, with the RhoG lipidation site aligning to the DOCK5 phosphoinositide-binding site for coincident membrane engagement [#40]. RhoG is loaded by multiple specific GEFs—Trio, SGEF, Ephexin4, P-Rex1, Vav2, and PLEKHG6—that connect it to distinct receptors and locales including ICAM1, EphA2, and ezrin-organized apical membrane [#2, #8, #13, #15, #16, #20, #30], and it is restrained by RhoGDI-3, which targets it to the Golgi, and by a syndecan-4/synectin/RhoGDI1 complex released upon PKCα phosphorylation [#5, #6, #19]. Beyond the ELMO/DOCK axis, RhoG signals independently of Rac1 by binding the PI3K regulatory subunit p85α to stimulate Akt and suppress anoikis [#33], engages kinectin for microtubule- and kinesin-dependent lysosomal transport [#4], and binds Munc13-4 to dock cytotoxic granules for exocytosis [#37]. RhoG operates in phagocytosis through FcγR, CR3, and TCR-coupled uptake, in leukocyte trans-endothelial migration and NADPH oxidase activation, and is exploited by Yersinia Invasin (and inactivated by the effector YopE) during bacterial invasion [#15, #17, #22, #24, #41]. Biallelic loss-of-function mutations in RHOG cause hemophagocytic lymphohistiocytosis through defective cytotoxic granule exocytosis [#37].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing how RhoG is held inactive defined its regulatory boundaries before its effectors were known, identifying a dedicated GDI with unusual membrane association.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro GDP/GTP exchange inhibition, and membrane fractionation identifying RhoGDI-3 binding to RhoB and RhoG\",\n      \"pmids\": [\"8939998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define RhoG's downstream effectors\", \"Specificity for RhoG versus RhoB regulation in vivo not resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrating that active RhoG phenocopies combined Rac1/Cdc42 activation but acts through them rather than their direct effectors placed RhoG upstream as a hierarchical regulator of the other GTPases.\",\n      \"evidence\": \"GFP-fusion expression, dominant-negative epistasis, and nocodazole microtubule depolymerization in cultured cells\",\n      \"pmids\": [\"9614181\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between RhoG and Rac1/Cdc42 activation unidentified\", \"Microtubule dependence mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identifying Trio's N-terminal GEF domain as a RhoG-preferring exchange factor provided the first defined upstream activator and a route to the cytoskeleton via filamin.\",\n      \"evidence\": \"In vitro nucleotide exchange assays, cell-based epistasis, and filamin-deficient cell reconstitution\",\n      \"pmids\": [\"10652265\", \"11146652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor inputs activating Trio not defined\", \"Effector linking RhoG to actin still unknown at this stage\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of kinectin as a GTP-dependent RhoG effector explained RhoG's microtubule requirement, linking it to kinesin-driven organelle transport.\",\n      \"evidence\": \"Yeast two-hybrid, co-precipitation, antibody injection, and time-lapse imaging of lysosomal transport\",\n      \"pmids\": [\"11689693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between kinectin output and Rac1/Cdc42 activation unresolved\", \"Not connected to a specific receptor pathway\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Placing RhoG within NGF/Ras-driven neurite outgrowth and identifying Vav2/p85α/Akt and PI3K-dependent survival outputs revealed both the Rac/Cdc42 and Rac-independent branches of RhoG signaling.\",\n      \"evidence\": \"Constitutive/dominant-negative GTPase epistasis, GTP-dependent effector pulldowns, PI3K co-IP, and Akt/JNK/apoptosis assays\",\n      \"pmids\": [\"10982854\", \"11864571\", \"12376551\", \"11803464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct effector for the Rac1-independent lamellipodia output not defined\", \"Physiological GEF coupling for survival signaling unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defining how RhoGDI-3 targets RhoG to the Golgi via its N-terminal amphipathic helix established spatial control of RhoG inactivation.\",\n      \"evidence\": \"Confocal microscopy, immuno-isolation, and N-terminal domain mutagenesis with GFP-targeting\",\n      \"pmids\": [\"11967128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal releasing RhoG from the Golgi pool not identified\", \"Functional consequence of Golgi sequestration in vivo unaddressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing the conserved TRIO→RhoG→ELMO→DOCK180→Rac module across worm and mammal, with SGEF as a RhoG-specific GEF and a crystal structure rationalizing Trio's RhoG preference, crystallized the core RhoG signaling pathway.\",\n      \"evidence\": \"C. elegans genetic epistasis, mammalian engulfment assays, GST pulldowns/domain mapping, in vitro exchange with specificity mutants, and X-ray crystallography of TrioN DH/PH\",\n      \"pmids\": [\"12879077\", \"15620647\", \"15133129\", \"15199069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the RhoG-ELMO-DOCK ternary complex not yet resolved\", \"Membrane recruitment dynamics of the complex undefined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Loss-of-function knockdown demonstrated that endogenous RhoG drives Rac1 activation, lamellipodia, and migration through ELMO/DOCK180, confirming the pathway's requirement rather than mere sufficiency.\",\n      \"evidence\": \"RNAi in HeLa cells with migration assays, Rac1 activation pulldowns, and pathway rescue\",\n      \"pmids\": [\"16339170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crk-independence of DOCK180 in this context not mechanistically explained\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Knockout and screen-based studies showed RhoG controls neutrophil NADPH oxidase activity and engages DOCK4/ELMO, extending the module to innate immune effector functions and a second DOCK GEF.\",\n      \"evidence\": \"RhoG knockout mice with oxidase/Rac activation assays, and co-IP plus localization for DOCK4\",\n      \"pmids\": [\"16621998\", \"17027967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why Rac1/Rac2 reduction is transient unexplained\", \"Selectivity between DOCK180 and DOCK4 across cell types unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linking RhoG to ICAM1/SGEF in endothelium, ezrin/PLEKHG6 at the apical pole, and a Rac-independent p85α/PI3K survival pathway connected RhoG to receptor-proximal recruitment and anoikis resistance.\",\n      \"evidence\": \"siRNA knockdown, reciprocal co-IP, TEM and macropinocytosis assays, and RhoG-p85α co-IP with anoikis assays\",\n      \"pmids\": [\"17875742\", \"17881735\", \"17570359\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How distinct GEFs partition RhoG between Rac-dependent and PI3K-dependent outputs unclear\", \"Direct structural basis of RhoG-p85α binding not determined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defining the syndecan-4/synectin/RhoGDI1 brake released by PKCα, a proliferation role requiring PI3K but not ELMO, and pathogen hijacking of RhoG by Yersinia revealed both physiological regulation and exploitation of the switch.\",\n      \"evidence\": \"Ternary-complex co-IP with phospho-site mutagenesis, in utero electroporation with PI3K/ELMO epistasis, and FRET biosensors with bacterial invasion assays\",\n      \"pmids\": [\"19581409\", \"19812248\", \"19208761\", \"19720752\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effectors mediating ELMO-independent proliferation undefined\", \"How YopE Golgi/ER localization confers RhoG specificity not fully resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"A burst of loss-of-function and in vivo studies established RhoG as a broad mediator of phagocytic uptake (FcγR, CR3, TCR), integrin endocytosis, dendritic spine formation, and EphA2/Ephexin4-driven invasion and anoikis resistance.\",\n      \"evidence\": \"RNAi screens, RhoG knockout mice with wound-healing and integrin trafficking assays, phagocytosis and spine morphometry, and knockdown-rescue epistasis\",\n      \"pmids\": [\"21820331\", \"21982645\", \"21878497\", \"21900250\", \"20679435\", \"21621533\", \"20237158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting RhoG to RhoA downstream of CR3 unexplained\", \"How a single GTPase coordinates such diverse receptor inputs spatially undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"miR-124 control of RhoG expression and platelet GPVI-specific functions showed transcript-level regulation and receptor-restricted physiological roles in neuronal complexity and granule secretion/thrombosis.\",\n      \"evidence\": \"miRNA target validation with neuron morphometry, and RhoG knockout mice with platelet aggregation, granule secretion, and in vivo thrombosis assays\",\n      \"pmids\": [\"22588079\", \"24106270\", \"24106269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GPVI-proximal mechanism coupling Src-family kinases to RhoG activation incomplete\", \"Effector mediating granule secretion at this stage unidentified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying P-Rex1 as a RhoG GEF placing RhoG upstream of DOCK2 in neutrophils, and Anillin and the ELMO2/ILK (ERI) complex as effectors, broadened the effector repertoire to actin-stabilizing and microtubule-stabilizing outputs.\",\n      \"evidence\": \"In vitro GEF assays with knockout mice, DOCK2 localization, direct RhoG-Anillin binding with CRISPR genetics, and ERI co-IP with microtubule dynamics imaging\",\n      \"pmids\": [\"24659802\", \"25843030\", \"25995380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coordination between DOCK2 and DOCK180/ELMO recruitment by RhoG unresolved\", \"ERI complex role across non-keratinocyte tissues untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Studies of invadopodia disassembly, focal adhesion dynamics, and PDGF-driven dorsal ruffles refined RhoG's roles in turnover of adhesive and protrusive structures, often opposing or independent of Rac1.\",\n      \"evidence\": \"siRNA knockdown with live-cell invadopodia/FA imaging, paxillin phosphorylation immunoblot, and macropinocytosis/internalization assays with signaling inhibitors\",\n      \"pmids\": [\"28202690\", \"28468978\", \"30914742\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Effectors mediating Rac1-independent FA and CDR control not identified\", \"Findings from single labs without cross-system replication\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery of biallelic RHOG loss-of-function in a patient with HLH and a direct RhoG-Munc13-4 interaction tied RhoG to cytotoxic granule docking and human disease.\",\n      \"evidence\": \"Patient genetics, RHOG ablation in CTLs, CG exocytosis and plasma-membrane proximity assays, and RhoG-Munc13-4 co-IP\",\n      \"pmids\": [\"33513601\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Munc13-4 docking requires the ELMO/DOCK axis or is independent unresolved\", \"Structural basis of RhoG-Munc13-4 binding undetermined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cryo-EM of DOCK5/ELMO1 with RhoG and Rac1, plus an M-phase Ephexin4 phosphorylation event, provided the structural mechanism of RhoG-driven DOCK activation and a cell-cycle-coupled regulatory layer.\",\n      \"evidence\": \"Cryo-EM with in vitro Rac GEF and SPR assays, and Ephexin4 phospho-mutant rescue with chromosome alignment and RhoG activity assays\",\n      \"pmids\": [\"38857861\", \"39675713\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures of RhoG with DOCK180 or DOCK4 not determined\", \"In vivo relevance of the M-phase RhoG localization pathway untested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Optogenetic and dual-biosensor causal analysis directly demonstrated that RhoG unidirectionally activates Rac1 via DOCK180 and independently activates Cdc42, resolving the causal hierarchy among the GTPases.\",\n      \"evidence\": \"Photoactivatable RhoG, FRET biosensors, causal inference, and DOCK180 epistasis in live cells (preprint)\",\n      \"pmids\": [\"42182105\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effectors for the Cdc42-independent protrusion outputs unidentified\", \"Preprint not yet peer-reviewed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RhoG selects among its many GEFs, effectors, and Rac-dependent versus Rac-independent outputs in a given cellular context remains the central unresolved question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of context-dependent effector choice\", \"Structural basis of RhoG-p85α, RhoG-kinectin, and RhoG-Munc13-4 binding undetermined\", \"Mechanism converting upstream GEF identity into distinct downstream programs unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GTPase activity\", \"supporting_discovery_ids\": [0, 5, 41]},\n      {\"term_id\": \"molecular transducer activity\", \"supporting_discovery_ids\": [0, 10, 40, 45]},\n      {\"term_id\": \"molecular function regulator activity\", \"supporting_discovery_ids\": [40, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 18, 20, 24, 37]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [6, 41]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 13, 20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [17, 22, 24, 30, 37]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [4, 8, 23, 35]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [37, 41]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [11, 25, 27, 43]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [14, 33, 26]}\n    ],\n    \"complexes\": [\n      \"RhoG-ELMO-DOCK180 complex\",\n      \"syndecan-4/synectin/RhoGDI1 ternary complex\",\n      \"ELMO2-ILK-RhoG (ERI) complex\"\n    ],\n    \"partners\": [\n      \"ELMO1\",\n      \"DOCK180\",\n      \"DOCK5\",\n      \"Trio\",\n      \"SGEF\",\n      \"Ephexin4\",\n      \"kinectin\",\n      \"Munc13-4\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}