{"gene":"GMIP","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2002,"finding":"GMIP was identified as a novel RhoA-specific GTPase-activating protein (RhoGAP) that interacts with Gem (a Ras-related protein) through its N-terminal half. The RhoGAP domain of GMIP stimulates in vitro GTPase activity of RhoA but not Rac1 or Cdc42, and full-length GMIP down-regulates RhoA-dependent stress fibers in Ref-52 rat fibroblasts.","method":"Yeast two-hybrid screen, in vitro GTPase assay, cell morphology/actin staining in fibroblasts","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro GTPase assay with specificity panel, mutagenesis context implied by domain mapping, replicated by multiple subsequent labs","pmids":["12093360"],"is_preprint":false},{"year":2007,"finding":"GTP-bound Gem interacts with active (phosphorylated) Ezrin at the plasma membrane-cytoskeleton interface, and the downstream effects of Gem on RhoA inactivation, ERM phosphorylation, actin stress fiber disappearance, and focal adhesion collapse require the RhoGAP partner GMIP, which is enriched in membranes under these conditions.","method":"Co-immunoprecipitation, cell elongation/morphology assay, membrane fractionation, dominant-negative/overexpression constructs","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus functional rescue experiments, single lab but multiple orthogonal methods","pmids":["17267693"],"is_preprint":false},{"year":2012,"finding":"GMIP associates with the Rab27a effector JFC1 (Slp1) and modulates vesicular transport and exocytosis. GMIP knockdown induces RhoA activation and actin polymerization, impairing secretory granule movement through cortical actin. RhoA activity polarizes around JFC1-containing secretory granules, and JFC1 knockout neutrophils show increased RhoA activity with azurophilic granules unable to traverse cortical actin.","method":"Proteomic/mass spectrometry identification, siRNA knockdown, live-cell quantitative microscopy, JFC1 knockout neutrophil analysis, RhoA activity assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (proteomics, KD, KO, live imaging, RhoA assay), genetic validation in primary cells","pmids":["22438581"],"is_preprint":false},{"year":2014,"finding":"Gmip is a RhoA-specific GAP localized at the proximal leading process of migrating neurons in the postnatal ventricular-subventricular zone. Gmip negatively regulates RhoA activity at this site to control the saltatory movement speed and stop positions of neurons migrating to the olfactory bulb, thereby regulating neural circuit formation.","method":"In vivo knockdown (shRNA), live-cell imaging of neuronal migration, RhoA activity assays, subcellular localization by immunofluorescence","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo loss-of-function with specific migration phenotype, subcellular localization linked to function, RhoA activity measurement","pmids":["25074242"],"is_preprint":false},{"year":2014,"finding":"Gem acts upstream of GMIP and RhoA to regulate cortical actin remodeling and spindle positioning during early mitosis. Overexpression of Gem causes cortical actin disruption and spindle mispositioning; knockdown of GMIP rescues Gem-induced spindle phenotype. Introduction of active RhoA rescues actin and spindle positioning defects caused by Gem or GMIP overexpression, placing GMIP between Gem and RhoA in this pathway.","method":"Overexpression, siRNA knockdown, dominant-negative and constitutively active RhoA constructs, immunofluorescence microscopy of spindle positioning","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis established by rescue experiments, multiple constructs, single lab","pmids":["25173885"],"is_preprint":false},{"year":2014,"finding":"The EBV tegument protein BGLF2 interacts with GMIP and NEK9. Silencing either GMIP or NEK9 induces p21 levels without affecting p53, and abrogates the ability of BGLF2 to further induce p21, suggesting GMIP regulates p21 levels and BGLF2 induces p21 by interfering with GMIP function.","method":"Proteomic analysis (BGLF2-interacting proteins), siRNA knockdown of GMIP/NEK9, p21/p53 Western blotting","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic identification plus functional siRNA validation with defined molecular readout, single lab","pmids":["24501404"],"is_preprint":false},{"year":2015,"finding":"Crystal structure of the yeast Rgd1p F-BAR domain (bound to inositol phosphate) reveals a phosphoinositide-binding site that is fully conserved in the mammalian RhoGAP GMIP, indicating GMIP's F-BAR domain preferentially binds phosphoinositides via a conserved structural mechanism.","method":"X-ray crystallography of yeast Rgd1p F-BAR domain, in vitro lipid-binding assays, sequence conservation analysis with mammalian GMIP","journal":"Structure (London, England : 1993)","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure with ligand bound establishes binding site, but direct experimental validation in GMIP itself was not performed; inference from sequence conservation","pmids":["25620000"],"is_preprint":false},{"year":2020,"finding":"GMIP overexpression attenuates lung cancer cell migration, supporting a tumor suppressor function. GMIP is hypermethylated by the RASSF1C-PIWIL1-piRNA pathway in non-small cell lung cancer cells.","method":"Overexpression in NSCLC cell line (H1299), cell migration assay, Reduced Representation Bisulfite Sequencing (RRBS) for DNA methylation","journal":"Oncotarget","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single overexpression migration assay, single lab, limited mechanistic detail in abstract","pmids":["33227088"],"is_preprint":false},{"year":2024,"finding":"GMIP contains a pLxIS motif and functions as an activator of interferon (IFN) responses, stimulating IRF transcription factors independent of all known pattern-recognition receptor pathways, as part of a larger ARIES signaling domain that also activates TRAF6, IκB kinases, and MAP kinases.","method":"Synthetic biology-based platform screening, IFN reporter assays, pathway epistasis analysis","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional IFN assay with multiple pathway readouts, novel finding, single lab","pmids":["38925114"],"is_preprint":false}],"current_model":"GMIP (Gem-interacting protein) is a RhoA-specific GTPase-activating protein that inactivates RhoA to promote actin depolymerization; it is recruited to membranes through an F-BAR domain that binds phosphoinositides, associates with Gem (via its N-terminal half) and Rab27a effector JFC1 to facilitate secretory granule transit through cortical actin during exocytosis, controls saltatory neuronal migration speed in the postnatal brain by locally inactivating RhoA at the leading process, acts downstream of Gem and upstream of RhoA to regulate cortical actin and mitotic spindle positioning, and additionally harbors a pLxIS-containing ARIES domain that activates type I interferon responses via IRF transcription factors and related kinase pathways."},"narrative":{"mechanistic_narrative":"GMIP (Gem-interacting protein) is a RhoA-specific GTPase-activating protein that locally inactivates RhoA to drive actin remodeling across diverse cellular processes [PMID:12093360]. Identified through its N-terminal interaction with the Ras-related protein Gem, GMIP stimulates RhoA — but not Rac1 or Cdc42 — GTP hydrolysis in vitro and dismantles RhoA-dependent stress fibers when overexpressed [PMID:12093360]. Functioning downstream of GTP-bound Gem, GMIP membrane enrichment is required for Gem-driven RhoA inactivation, ERM dephosphorylation, stress fiber loss, and focal adhesion collapse [PMID:17267693], and this Gem→GMIP→RhoA axis also governs cortical actin remodeling and mitotic spindle positioning, where GMIP knockdown rescues Gem-induced spindle defects and active RhoA reverses them [PMID:25173885]. GMIP recruitment to membranes is mediated by an F-BAR domain bearing a phosphoinositide-binding site conserved with the yeast ortholog Rgd1p [PMID:25620000]. Through these activities GMIP enables cytoskeletal events that depend on relieving cortical RhoA tone: it associates with the Rab27a effector JFC1 (Slp1) to permit secretory granule passage through cortical actin during exocytosis [PMID:22438581], and at the proximal leading process of postnatal migrating neurons it tunes RhoA activity to set saltatory movement speed and stop positions during olfactory-bulb-directed migration [PMID:25074242]. Separately, GMIP contains a pLxIS motif within an ARIES signaling domain that activates IRF-dependent type I interferon responses independent of known pattern-recognition receptors, alongside TRAF6, IκB kinase, and MAP kinase activation [PMID:38925114].","teleology":[{"year":2002,"claim":"Establishing GMIP's core biochemical identity, this work showed it is a RhoA-selective GAP partnered to Gem, defining the molecular activity all later studies build on.","evidence":"Yeast two-hybrid screen, in vitro GTPase assay with a Rho/Rac/Cdc42 specificity panel, and actin staining in rat fibroblasts","pmids":["12093360"],"confidence":"High","gaps":["Did not define how GMIP is recruited to membranes or activated in cells","Functional consequence of the Gem interaction not yet established"]},{"year":2007,"claim":"Placed GMIP functionally downstream of GTP-bound Gem at the membrane-cytoskeleton interface, showing GMIP is required for Gem-driven RhoA inactivation and the resulting ERM/stress-fiber/focal-adhesion changes.","evidence":"Co-immunoprecipitation, membrane fractionation, cell elongation assays, and dominant-negative/overexpression constructs","pmids":["17267693"],"confidence":"Medium","gaps":["Single lab","Direct membrane-targeting mechanism of GMIP not resolved"]},{"year":2012,"claim":"Linked GMIP's RhoA-inactivating activity to a defined cell-biological output — secretory granule transit through cortical actin — by identifying the Rab27a effector JFC1 as a partner.","evidence":"Proteomic identification, siRNA knockdown, live-cell imaging, RhoA activity assays, and analysis of JFC1-knockout neutrophils","pmids":["22438581"],"confidence":"High","gaps":["Whether GMIP-JFC1 binding is direct or bridged not fully resolved","Spatial mechanism coupling RhoA polarization to granules not detailed"]},{"year":2014,"claim":"Demonstrated an in vivo physiological role: GMIP locally inactivates RhoA at the leading process of migrating neurons to control saltatory speed and stop positions, connecting the GAP activity to neural circuit formation.","evidence":"In vivo shRNA knockdown, live imaging of neuronal migration, RhoA activity assays, and subcellular immunofluorescence","pmids":["25074242"],"confidence":"High","gaps":["Upstream signal directing GMIP localization to the proximal leading process unknown","Relationship to Gem in neurons not addressed"]},{"year":2014,"claim":"Established genetic epistasis placing GMIP between Gem and RhoA in control of cortical actin and mitotic spindle positioning via rescue experiments.","evidence":"Overexpression, siRNA knockdown, dominant-negative/constitutively active RhoA constructs, and spindle-positioning immunofluorescence","pmids":["25173885"],"confidence":"Medium","gaps":["Single lab","Direct biochemical demonstration of Gem-regulated GMIP activity in mitosis not shown"]},{"year":2014,"claim":"Connected GMIP to cell-cycle/checkpoint output, showing its silencing induces p21 (p53-independent) and that EBV BGLF2 induces p21 by interfering with GMIP.","evidence":"Proteomic identification of BGLF2 partners, siRNA knockdown of GMIP/NEK9, and p21/p53 Western blotting","pmids":["24501404"],"confidence":"Medium","gaps":["Mechanism linking GMIP to p21 regulation undefined","Whether this depends on GMIP's GAP activity unknown"]},{"year":2015,"claim":"Provided a structural basis for membrane recruitment, showing the phosphoinositide-binding site of the F-BAR domain is conserved in GMIP, rationalizing its membrane enrichment.","evidence":"X-ray crystallography of yeast Rgd1p F-BAR with inositol phosphate, lipid-binding assays, and sequence conservation analysis with mammalian GMIP","pmids":["25620000"],"confidence":"Medium","gaps":["Binding inferred from yeast ortholog; not directly validated in GMIP","Phosphoinositide specificity of GMIP itself not measured"]},{"year":2020,"claim":"Suggested a tumor-suppressor role for GMIP in lung cancer through migration suppression and epigenetic silencing.","evidence":"Overexpression in NSCLC cells, migration assay, and reduced representation bisulfite sequencing","pmids":["33227088"],"confidence":"Low","gaps":["Single overexpression migration assay with limited mechanistic detail","No link drawn to GMIP's GAP activity in this context"]},{"year":2024,"claim":"Revealed an unexpected immune-signaling function: a pLxIS-containing ARIES domain in GMIP activates IRF-dependent interferon responses independent of known pattern-recognition receptors.","evidence":"Synthetic-biology platform screening, IFN reporter assays, and pathway epistasis analysis","pmids":["38925114"],"confidence":"Medium","gaps":["Physiological trigger and context of this signaling unknown","Relationship between GMIP's GAP/cytoskeletal role and IFN activation unresolved","Single lab"]},{"year":null,"claim":"How GMIP's two apparently distinct activities — RhoA inactivation/cytoskeletal control and ARIES-domain interferon signaling — are coordinated or regulated within a single protein remains unknown.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated regulatory model linking GAP and immune-signaling functions","Post-translational control of GMIP activity uncharacterized","Endogenous stimuli engaging each function not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,3,4]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[6]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,2,3]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,4]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8]}],"complexes":[],"partners":["GEM","JFC1","EZR","NEK9","BGLF2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9P107","full_name":"GEM-interacting protein","aliases":[],"length_aa":970,"mass_kda":106.7,"function":"Stimulates, in vitro and in vivo, the GTPase activity of RhoA","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q9P107/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GMIP","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GMIP","total_profiled":1310},"omim":[{"mim_id":"609694","title":"GEM-INTERACTING PROTEIN; GMIP","url":"https://www.omim.org/entry/609694"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Enhanced"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":48.1},{"tissue":"lymphoid tissue","ntpm":52.0}],"url":"https://www.proteinatlas.org/search/GMIP"},"hgnc":{"alias_symbol":["ARHGAP46"],"prev_symbol":[]},"alphafold":{"accession":"Q9P107","domains":[{"cath_id":"1.20.1270.60","chopping":"80-231_252-334","consensus_level":"high","plddt":96.0044,"start":80,"end":334},{"cath_id":"3.30.60.20","chopping":"483-542","consensus_level":"medium","plddt":91.4485,"start":483,"end":542},{"cath_id":"1.10.555.10","chopping":"555-651_664-723_731-756","consensus_level":"high","plddt":91.4013,"start":555,"end":756}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P107","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P107-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P107-F1-predicted_aligned_error_v6.png","plddt_mean":68.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GMIP","jax_strain_url":"https://www.jax.org/strain/search?query=GMIP"},"sequence":{"accession":"Q9P107","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9P107.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9P107/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P107"}},"corpus_meta":[{"pmid":"21207424","id":"PMC_21207424","title":"Molecular markers of endometrial carcinoma detected in uterine aspirates.","date":"2011","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21207424","citation_count":99,"is_preprint":false},{"pmid":"22438581","id":"PMC_22438581","title":"Vesicular trafficking through cortical actin during exocytosis is regulated by the Rab27a effector JFC1/Slp1 and the RhoA-GTPase-activating protein Gem-interacting protein.","date":"2012","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/22438581","citation_count":83,"is_preprint":false},{"pmid":"25074242","id":"PMC_25074242","title":"Speed control for neuronal migration in the postnatal brain by Gmip-mediated local inactivation of RhoA.","date":"2014","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/25074242","citation_count":50,"is_preprint":false},{"pmid":"12093360","id":"PMC_12093360","title":"A novel Rho GTPase-activating-protein interacts with Gem, a member of the Ras superfamily of GTPases.","date":"2002","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/12093360","citation_count":48,"is_preprint":false},{"pmid":"24501404","id":"PMC_24501404","title":"Identification of herpesvirus proteins that contribute to G1/S arrest.","date":"2014","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/24501404","citation_count":44,"is_preprint":false},{"pmid":"17267693","id":"PMC_17267693","title":"Gem associates with Ezrin and acts via the Rho-GAP protein Gmip to down-regulate the Rho pathway.","date":"2007","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/17267693","citation_count":43,"is_preprint":false},{"pmid":"16143398","id":"PMC_16143398","title":"Gene profiling involved in immature CD4+ T lymphocyte responsible for systemic lupus erythematosus.","date":"2005","source":"Molecular 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interacting protein (GMIP) gene is associated with major depressive disorder.","date":"2005","source":"Neurogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/16086184","citation_count":14,"is_preprint":false},{"pmid":"33227088","id":"PMC_33227088","title":"The impact of the RASSF1C and PIWIL1 on DNA methylation: the identification of GMIP as a tumor suppressor.","date":"2020","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/33227088","citation_count":14,"is_preprint":false},{"pmid":"25173885","id":"PMC_25173885","title":"Gem GTPase acts upstream Gmip/RhoA to regulate cortical actin remodeling and spindle positioning during early mitosis.","date":"2014","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/25173885","citation_count":12,"is_preprint":false},{"pmid":"36610078","id":"PMC_36610078","title":"DeLIVR: a deep learning approach to IV regression for testing nonlinear causal effects in transcriptome-wide association 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\"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"GMIP was identified as a novel RhoA-specific GTPase-activating protein (RhoGAP) that interacts with Gem (a Ras-related protein) through its N-terminal half. The RhoGAP domain of GMIP stimulates in vitro GTPase activity of RhoA but not Rac1 or Cdc42, and full-length GMIP down-regulates RhoA-dependent stress fibers in Ref-52 rat fibroblasts.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro GTPase assay, cell morphology/actin staining in fibroblasts\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro GTPase assay with specificity panel, mutagenesis context implied by domain mapping, replicated by multiple subsequent labs\",\n      \"pmids\": [\"12093360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GTP-bound Gem interacts with active (phosphorylated) Ezrin at the plasma membrane-cytoskeleton interface, and the downstream effects of Gem on RhoA inactivation, ERM phosphorylation, actin stress fiber disappearance, and focal adhesion collapse require the RhoGAP partner GMIP, which is enriched in membranes under these conditions.\",\n      \"method\": \"Co-immunoprecipitation, cell elongation/morphology assay, membrane fractionation, dominant-negative/overexpression constructs\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus functional rescue experiments, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"17267693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GMIP associates with the Rab27a effector JFC1 (Slp1) and modulates vesicular transport and exocytosis. GMIP knockdown induces RhoA activation and actin polymerization, impairing secretory granule movement through cortical actin. RhoA activity polarizes around JFC1-containing secretory granules, and JFC1 knockout neutrophils show increased RhoA activity with azurophilic granules unable to traverse cortical actin.\",\n      \"method\": \"Proteomic/mass spectrometry identification, siRNA knockdown, live-cell quantitative microscopy, JFC1 knockout neutrophil analysis, RhoA activity assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (proteomics, KD, KO, live imaging, RhoA assay), genetic validation in primary cells\",\n      \"pmids\": [\"22438581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Gmip is a RhoA-specific GAP localized at the proximal leading process of migrating neurons in the postnatal ventricular-subventricular zone. Gmip negatively regulates RhoA activity at this site to control the saltatory movement speed and stop positions of neurons migrating to the olfactory bulb, thereby regulating neural circuit formation.\",\n      \"method\": \"In vivo knockdown (shRNA), live-cell imaging of neuronal migration, RhoA activity assays, subcellular localization by immunofluorescence\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo loss-of-function with specific migration phenotype, subcellular localization linked to function, RhoA activity measurement\",\n      \"pmids\": [\"25074242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Gem acts upstream of GMIP and RhoA to regulate cortical actin remodeling and spindle positioning during early mitosis. Overexpression of Gem causes cortical actin disruption and spindle mispositioning; knockdown of GMIP rescues Gem-induced spindle phenotype. Introduction of active RhoA rescues actin and spindle positioning defects caused by Gem or GMIP overexpression, placing GMIP between Gem and RhoA in this pathway.\",\n      \"method\": \"Overexpression, siRNA knockdown, dominant-negative and constitutively active RhoA constructs, immunofluorescence microscopy of spindle positioning\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis established by rescue experiments, multiple constructs, single lab\",\n      \"pmids\": [\"25173885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The EBV tegument protein BGLF2 interacts with GMIP and NEK9. Silencing either GMIP or NEK9 induces p21 levels without affecting p53, and abrogates the ability of BGLF2 to further induce p21, suggesting GMIP regulates p21 levels and BGLF2 induces p21 by interfering with GMIP function.\",\n      \"method\": \"Proteomic analysis (BGLF2-interacting proteins), siRNA knockdown of GMIP/NEK9, p21/p53 Western blotting\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic identification plus functional siRNA validation with defined molecular readout, single lab\",\n      \"pmids\": [\"24501404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structure of the yeast Rgd1p F-BAR domain (bound to inositol phosphate) reveals a phosphoinositide-binding site that is fully conserved in the mammalian RhoGAP GMIP, indicating GMIP's F-BAR domain preferentially binds phosphoinositides via a conserved structural mechanism.\",\n      \"method\": \"X-ray crystallography of yeast Rgd1p F-BAR domain, in vitro lipid-binding assays, sequence conservation analysis with mammalian GMIP\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure with ligand bound establishes binding site, but direct experimental validation in GMIP itself was not performed; inference from sequence conservation\",\n      \"pmids\": [\"25620000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GMIP overexpression attenuates lung cancer cell migration, supporting a tumor suppressor function. GMIP is hypermethylated by the RASSF1C-PIWIL1-piRNA pathway in non-small cell lung cancer cells.\",\n      \"method\": \"Overexpression in NSCLC cell line (H1299), cell migration assay, Reduced Representation Bisulfite Sequencing (RRBS) for DNA methylation\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single overexpression migration assay, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"33227088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GMIP contains a pLxIS motif and functions as an activator of interferon (IFN) responses, stimulating IRF transcription factors independent of all known pattern-recognition receptor pathways, as part of a larger ARIES signaling domain that also activates TRAF6, IκB kinases, and MAP kinases.\",\n      \"method\": \"Synthetic biology-based platform screening, IFN reporter assays, pathway epistasis analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional IFN assay with multiple pathway readouts, novel finding, single lab\",\n      \"pmids\": [\"38925114\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GMIP (Gem-interacting protein) is a RhoA-specific GTPase-activating protein that inactivates RhoA to promote actin depolymerization; it is recruited to membranes through an F-BAR domain that binds phosphoinositides, associates with Gem (via its N-terminal half) and Rab27a effector JFC1 to facilitate secretory granule transit through cortical actin during exocytosis, controls saltatory neuronal migration speed in the postnatal brain by locally inactivating RhoA at the leading process, acts downstream of Gem and upstream of RhoA to regulate cortical actin and mitotic spindle positioning, and additionally harbors a pLxIS-containing ARIES domain that activates type I interferon responses via IRF transcription factors and related kinase pathways.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GMIP (Gem-interacting protein) is a RhoA-specific GTPase-activating protein that locally inactivates RhoA to drive actin remodeling across diverse cellular processes [#0]. Identified through its N-terminal interaction with the Ras-related protein Gem, GMIP stimulates RhoA — but not Rac1 or Cdc42 — GTP hydrolysis in vitro and dismantles RhoA-dependent stress fibers when overexpressed [#0]. Functioning downstream of GTP-bound Gem, GMIP membrane enrichment is required for Gem-driven RhoA inactivation, ERM dephosphorylation, stress fiber loss, and focal adhesion collapse [#1], and this Gem→GMIP→RhoA axis also governs cortical actin remodeling and mitotic spindle positioning, where GMIP knockdown rescues Gem-induced spindle defects and active RhoA reverses them [#4]. GMIP recruitment to membranes is mediated by an F-BAR domain bearing a phosphoinositide-binding site conserved with the yeast ortholog Rgd1p [#6]. Through these activities GMIP enables cytoskeletal events that depend on relieving cortical RhoA tone: it associates with the Rab27a effector JFC1 (Slp1) to permit secretory granule passage through cortical actin during exocytosis [#2], and at the proximal leading process of postnatal migrating neurons it tunes RhoA activity to set saltatory movement speed and stop positions during olfactory-bulb-directed migration [#3]. Separately, GMIP contains a pLxIS motif within an ARIES signaling domain that activates IRF-dependent type I interferon responses independent of known pattern-recognition receptors, alongside TRAF6, IκB kinase, and MAP kinase activation [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing GMIP's core biochemical identity, this work showed it is a RhoA-selective GAP partnered to Gem, defining the molecular activity all later studies build on.\",\n      \"evidence\": \"Yeast two-hybrid screen, in vitro GTPase assay with a Rho/Rac/Cdc42 specificity panel, and actin staining in rat fibroblasts\",\n      \"pmids\": [\"12093360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how GMIP is recruited to membranes or activated in cells\", \"Functional consequence of the Gem interaction not yet established\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placed GMIP functionally downstream of GTP-bound Gem at the membrane-cytoskeleton interface, showing GMIP is required for Gem-driven RhoA inactivation and the resulting ERM/stress-fiber/focal-adhesion changes.\",\n      \"evidence\": \"Co-immunoprecipitation, membrane fractionation, cell elongation assays, and dominant-negative/overexpression constructs\",\n      \"pmids\": [\"17267693\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct membrane-targeting mechanism of GMIP not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked GMIP's RhoA-inactivating activity to a defined cell-biological output — secretory granule transit through cortical actin — by identifying the Rab27a effector JFC1 as a partner.\",\n      \"evidence\": \"Proteomic identification, siRNA knockdown, live-cell imaging, RhoA activity assays, and analysis of JFC1-knockout neutrophils\",\n      \"pmids\": [\"22438581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GMIP-JFC1 binding is direct or bridged not fully resolved\", \"Spatial mechanism coupling RhoA polarization to granules not detailed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated an in vivo physiological role: GMIP locally inactivates RhoA at the leading process of migrating neurons to control saltatory speed and stop positions, connecting the GAP activity to neural circuit formation.\",\n      \"evidence\": \"In vivo shRNA knockdown, live imaging of neuronal migration, RhoA activity assays, and subcellular immunofluorescence\",\n      \"pmids\": [\"25074242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signal directing GMIP localization to the proximal leading process unknown\", \"Relationship to Gem in neurons not addressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established genetic epistasis placing GMIP between Gem and RhoA in control of cortical actin and mitotic spindle positioning via rescue experiments.\",\n      \"evidence\": \"Overexpression, siRNA knockdown, dominant-negative/constitutively active RhoA constructs, and spindle-positioning immunofluorescence\",\n      \"pmids\": [\"25173885\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct biochemical demonstration of Gem-regulated GMIP activity in mitosis not shown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected GMIP to cell-cycle/checkpoint output, showing its silencing induces p21 (p53-independent) and that EBV BGLF2 induces p21 by interfering with GMIP.\",\n      \"evidence\": \"Proteomic identification of BGLF2 partners, siRNA knockdown of GMIP/NEK9, and p21/p53 Western blotting\",\n      \"pmids\": [\"24501404\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking GMIP to p21 regulation undefined\", \"Whether this depends on GMIP's GAP activity unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided a structural basis for membrane recruitment, showing the phosphoinositide-binding site of the F-BAR domain is conserved in GMIP, rationalizing its membrane enrichment.\",\n      \"evidence\": \"X-ray crystallography of yeast Rgd1p F-BAR with inositol phosphate, lipid-binding assays, and sequence conservation analysis with mammalian GMIP\",\n      \"pmids\": [\"25620000\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding inferred from yeast ortholog; not directly validated in GMIP\", \"Phosphoinositide specificity of GMIP itself not measured\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Suggested a tumor-suppressor role for GMIP in lung cancer through migration suppression and epigenetic silencing.\",\n      \"evidence\": \"Overexpression in NSCLC cells, migration assay, and reduced representation bisulfite sequencing\",\n      \"pmids\": [\"33227088\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single overexpression migration assay with limited mechanistic detail\", \"No link drawn to GMIP's GAP activity in this context\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed an unexpected immune-signaling function: a pLxIS-containing ARIES domain in GMIP activates IRF-dependent interferon responses independent of known pattern-recognition receptors.\",\n      \"evidence\": \"Synthetic-biology platform screening, IFN reporter assays, and pathway epistasis analysis\",\n      \"pmids\": [\"38925114\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological trigger and context of this signaling unknown\", \"Relationship between GMIP's GAP/cytoskeletal role and IFN activation unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GMIP's two apparently distinct activities — RhoA inactivation/cytoskeletal control and ARIES-domain interferon signaling — are coordinated or regulated within a single protein remains unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated regulatory model linking GAP and immune-signaling functions\", \"Post-translational control of GMIP activity uncharacterized\", \"Endogenous stimuli engaging each function not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 3, 4]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GEM\", \"JFC1\", \"EZR\", \"NEK9\", \"BGLF2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}