{"gene":"FGD5","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2012,"finding":"FGD5 directly binds and activates Cdc42 in endothelial cells, promoting apoptosis-induced vaso-obliteration via induction of the hey1-p53 pathway, thereby acting as a genetic regulator of vascular pruning.","method":"Loss- and gain-of-function studies (in vitro tube-formation, aortic-ring, coated-bead assays; in vivo coated-bead plug assays and murine retina model); direct binding assay for Cdc42 activation","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal in vitro and in vivo functional assays with both loss- and gain-of-function, direct Cdc42 binding and pathway (hey1-p53) identification","pmids":["22661514"],"is_preprint":false},{"year":2012,"finding":"FGD5 is selectively expressed in human vascular endothelial cells, localizes to peripheral membrane ruffles and perinuclear regions, activates Cdc42, and mediates VEGF-induced activation of Cdc42 and ERK. Knockdown attenuates VEGF-promoted capillary-like network formation, permeability, directional movement, proliferation, and Golgi reorientation.","method":"Immunofluorescence microscopy (subcellular localization); siRNA knockdown with functional assays (network formation, permeability, directional movement, proliferation assays); overexpression Cdc42 activity assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional readouts with subcellular localization and downstream signaling, replicated across multiple endothelial assay types","pmids":["22328776"],"is_preprint":false},{"year":2014,"finding":"Fgd5 is required for embryonic development but is not required for definitive hematopoiesis or HSC function. Reporter knock-in mice demonstrate that Fgd5 expression near-exclusively labels HSCs in the bone marrow, and an Fgd5-CreERT2 allele allows tamoxifen-inducible HSC-specific deletion.","method":"Targeted reporter knock-in/knock-out alleles in mice; bone marrow transplantation (HSC activity assay); Fgd5-CreERT2 tamoxifen-inducible conditional deletion","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knock-in/knock-out with functional transplantation assay and CreERT2 tool, replicated across multiple reporter experiments","pmids":["24958848"],"is_preprint":false},{"year":2017,"finding":"FGD5 localizes to the inner surface of the cell membrane and the outer surface of EEA1-positive endosomes carrying VEGFR2. FGD5 depletion accelerates VEGFR2 degradation via the proteasome (rescued by lactacystin), inhibiting endothelial cell migration toward VEGFA gradients, thus sustaining VEGFA signaling by inhibiting proteasome-mediated VEGFR2 degradation.","method":"Immunofluorescence colocalization (FGD5 and EEA1/VEGFR2 on endosomes); siRNA knockdown; VEGFR2 degradation assay with proteasomal inhibitor lactacystin; chemotaxis migration assay","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 / Moderate — subcellular localization with functional consequence, proteasomal inhibitor rescue experiment, multiple orthogonal methods in single lab","pmids":["28927665"],"is_preprint":false},{"year":2017,"finding":"FGD5 forms a complex with VEGFR2 (co-immunoprecipitation) in resting and VEGF-stimulated endothelial cells, is enriched at the leading edge and endosomes, and loss of FGD5 reduces endosomal VEGFR2 coupling to PI3 kinase and diverts VEGFR2 to lysosomal degradation. FGD5 loss reduces mTORC2/Akt-dependent cortactin activation but does not alter VEGFR2 plasma membrane expression, Y1175 phosphorylation, or endocytosis.","method":"Co-immunoprecipitation; immunofluorescence; 3D sprouting angiogenesis assay; siRNA knockdown; Western blot for PI3K/mTORC2/Akt/cortactin signaling","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, subcellular localization, multiple signaling readouts in single lab with rigorous controls identifying negative results","pmids":["29051140"],"is_preprint":false},{"year":2019,"finding":"Purified FGD5 preferentially activates Rac1 (not Cdc42) as shown by GEF enzyme assay; Rac1 directly binds FGD5 in pull-down and co-immunoprecipitation assays. The FGD5 DH domain is structurally homologous to the Rac1 GEF TrioN. Aurintricarboxylic acid selectively inhibits FGD5 GEF activity and Rac1 interaction without affecting TrioN.","method":"In vitro GEF enzyme assay with purified Fgd5; GST pull-down; co-immunoprecipitation; surface plasmon resonance small-molecule screen; structural comparison of DH domain","journal":"Small GTPases","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution GEF assay with purified protein, orthogonal binding assays, selective inhibitor validation; single lab but multiple rigorous methods","pmids":["31601145"],"is_preprint":false},{"year":2019,"finding":"VE-PTP inhibition and Tie-2 activation induce tyrosine phosphorylation of FGD5 at Y820 (directly dephosphorylated by VE-PTP) and stimulate FGD5 translocation to cell contacts. FGD5 phosphorylation at Y820 is required for junction stabilization and Cdc42 activation by VE-PTP inhibition, but not for recruitment to cell contacts. FGD5 activation is a two-step process: membrane recruitment followed by Y820 phosphorylation.","method":"Phosphorylation mapping (Y820 mutagenesis); immunofluorescence (FGD5 translocation); in vitro and in vivo endothelial permeability assays; siRNA knockdown; actin cytoskeleton analysis","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-specific mutagenesis (Y820) identifying writer (VE-PTP/Tie-2), functional rescue assays in vitro and in vivo, multiple orthogonal readouts across cell junctions and Cdc42 activity","pmids":["31267715"],"is_preprint":false},{"year":2021,"finding":"FGD5 interacts with EGFR (co-immunoprecipitation) in gastric cancer cells, decreases EGFR ubiquitination, and sustains activation of EGFR downstream signaling (STAT3/pSTAT3). FGD5 knockdown inhibits tumorigenesis and migration in vivo and in vitro; FGD5 expression is associated with tumor stage.","method":"Co-immunoprecipitation; ubiquitination assay; shRNA knockdown; immunofluorescence; in vivo xenograft; Western blot for STAT3 signaling","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — co-IP identifying EGFR interaction and ubiquitination assay in single lab, functional loss-of-function with defined signaling readout","pmids":["34034092"],"is_preprint":false},{"year":2022,"finding":"FGD5 is enriched in mammary basal cells (BCs) and inhibits the transcriptional activity of ATF3, leading to transcriptional activation and secretion of CXCL14. CXCL14 then activates CXCR4/ERK signaling in mammary stromal endothelial cells, enhancing HIF-1α-regulated hedgehog ligand expression, creating a positive feedback loop promoting BC function. Conditional Fgd5 deletion reduced BC engraftment and ductal morphogenesis; conditional knockin increased them.","method":"Conditional deletion and knockin mouse models; mechanistic assays (ATF3 transcriptional activity, CXCL14/CXCR4/ERK signaling); ductal morphogenesis quantification","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO and KI in mice with defined cellular phenotype, pathway dissection via ATF3/CXCL14/CXCR4/ERK axis, multiple orthogonal functional readouts","pmids":["38821057"],"is_preprint":false},{"year":2022,"finding":"FGD5 regulates endothelial CXCR4-dependent PI3 kinase-β signaling. FGD5 loss abolishes CXCL12-stimulated PI3K-β and Akt activation. A RhoGEF-deficient (Dbl domain-deleted) FGD5 mutant failed to rescue PI3K signaling, indicating that FGD5's RhoGEF activity (generating Rac1-GTP) is required for CXCR4-dependent PI3K-β activation. Inhibition of Rac1 recapitulated FGD5 deficiency signaling defects.","method":"siRNA knockdown; RhoGEF-deficient mutant overexpression; Rac1 inhibition; Akt/PI3K-β phosphorylation assays; sprouting angiogenesis ex vivo; PI3K-β mutant with inactivated Rho-binding domain","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — domain-deletion mutagenesis combined with epistasis (Rac1 inhibition) and signaling rescue assays establishing mechanistic pathway in single lab with multiple orthogonal approaches","pmids":["34882832"],"is_preprint":false},{"year":2022,"finding":"FGD5 marks a subset of HSCs that do not divide or differentiate in response to IFN-γ, suggesting FGD5 identifies an IFN-γ-resistant HSC subpopulation that may preserve the HSC compartment during emergency hematopoiesis.","method":"Fgd5 reporter mice; IFN-γ stimulation; division/differentiation assays on Fgd5+ vs Fgd5- HSC populations","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic reporter system with functional stimulation assay, single lab, limited mechanistic depth","pmids":["35768035"],"is_preprint":false}],"current_model":"FGD5 is an endothelial-enriched Rho-family guanine nucleotide exchange factor (GEF) that activates both Cdc42 and Rac1 to regulate VEGF/VEGFR2 and CXCR4 signaling: it forms a complex with VEGFR2 on recycling endosomes to prevent proteasomal degradation and maintain PI3K/mTORC2/Akt-dependent cytoskeletal remodeling; its GEF activity (Rac1-GTP generation) drives CXCR4-dependent PI3K-β activation; it is tyrosine-phosphorylated at Y820 downstream of Tie-2/VE-PTP to stabilize endothelial junctions via Cdc42; it also promotes apoptosis-induced vascular pruning via the hey1-p53 pathway; outside the vasculature, FGD5 marks a quiescent, IFN-γ-resistant HSC subpopulation and, in mammary basal cells, suppresses ATF3 to drive CXCL14 secretion and a hedgehog-mediated endothelial feedback loop supporting ductal morphogenesis."},"narrative":{"mechanistic_narrative":"FGD5 is an endothelial-enriched Rho-family guanine nucleotide exchange factor that couples vascular growth-factor receptor signaling to actin remodeling, junction stability, and vascular pruning [PMID:22328776, PMID:22661514]. Purified FGD5 acts through a DH (Dbl-homology) domain to load GTP onto Rho-family GTPases; in vitro reconstitution shows it preferentially activates Rac1, while in endothelial cells it also drives Cdc42 activation downstream of VEGF [PMID:31601145, PMID:22328776]. A central function is the stabilization of VEGFR2: FGD5 localizes to EEA1-positive recycling endosomes where it forms a complex with VEGFR2, protecting the receptor from proteasomal and lysosomal degradation and sustaining endosomal VEGFR2 coupling to PI3K/mTORC2/Akt-dependent cortactin activation and directional migration [PMID:28927665, PMID:29051140]. Its RhoGEF-generated Rac1-GTP is likewise required for endothelial CXCR4/CXCL12-driven PI3K-β and Akt signaling [PMID:34882832]. FGD5 is integrated into junctional control as a two-step process—membrane recruitment followed by Y820 tyrosine phosphorylation downstream of Tie-2/VE-PTP—that activates Cdc42 to stabilize endothelial cell contacts [PMID:31267715], and it conversely promotes apoptosis-induced vascular pruning via the hey1-p53 pathway [PMID:22661514]. Beyond the vasculature, genetic reporter and conditional alleles establish FGD5 as a near-exclusive marker of bone-marrow HSCs, including an IFN-γ-resistant quiescent subpopulation [PMID:24958848, PMID:35768035], and in mammary basal cells FGD5 suppresses ATF3 to induce CXCL14 secretion, engaging a CXCR4/ERK-hedgehog endothelial feedback loop that supports ductal morphogenesis [PMID:38821057].","teleology":[{"year":2012,"claim":"Established FGD5 as an endothelial Cdc42 activator whose function determines whether vessels grow or are pruned, defining its first vascular role.","evidence":"Loss/gain-of-function in vitro and in vivo angiogenesis assays plus direct Cdc42 binding and hey1-p53 pathway identification in endothelial cells","pmids":["22661514","22328776"],"confidence":"High","gaps":["Did not resolve whether FGD5 GEF specificity is restricted to Cdc42","Mechanism linking GEF activity to hey1-p53 induction not detailed"]},{"year":2014,"claim":"Defined FGD5 expression as a near-exclusive HSC marker and built genetic tools (reporter, CreERT2) for HSC tracing, separating its dispensable role in hematopoiesis from a requirement in embryonic development.","evidence":"Targeted reporter knock-in/knock-out alleles, bone marrow transplantation, and tamoxifen-inducible conditional deletion in mice","pmids":["24958848"],"confidence":"High","gaps":["Molecular function of FGD5 within HSCs not addressed","Cause of embryonic requirement not mechanistically defined"]},{"year":2017,"claim":"Showed FGD5 stabilizes VEGFR2 on endosomes by blocking proteasomal/lysosomal degradation and sustaining PI3K/mTORC2/Akt-cortactin signaling, identifying a receptor-trafficking function distinct from its GEF role.","evidence":"Endosomal colocalization (EEA1/VEGFR2), proteasome inhibitor rescue, co-immunoprecipitation, and 3D sprouting/chemotaxis assays in endothelial cells","pmids":["28927665","29051140"],"confidence":"High","gaps":["Whether FGD5-VEGFR2 binding is direct or bridged not established","Relationship between trafficking function and GEF catalysis unresolved"]},{"year":2019,"claim":"Reconstituted FGD5 catalysis with purified protein showing preferential Rac1 (not Cdc42) activation, and identified Y820 phosphorylation downstream of Tie-2/VE-PTP as a junction-stabilizing activation step.","evidence":"In vitro GEF enzyme assay, pull-down/co-IP, selective inhibitor screen, and Y820 mutagenesis with permeability and Cdc42 activity assays","pmids":["31601145","31267715"],"confidence":"High","gaps":["In vitro Rac1 preference versus cellular Cdc42 activation not fully reconciled","Kinase directly phosphorylating Y820 not identified","Recruitment signal preceding Y820 phosphorylation undefined"]},{"year":2021,"claim":"Extended the receptor-stabilization mechanism beyond the vasculature, showing FGD5 binds EGFR and reduces its ubiquitination to sustain STAT3 signaling in gastric cancer.","evidence":"Co-immunoprecipitation, ubiquitination assay, shRNA knockdown, and xenograft tumorigenesis with STAT3 readout","pmids":["34034092"],"confidence":"Medium","gaps":["Single-lab co-IP without reciprocal validation in independent systems","Whether GEF activity contributes to EGFR stabilization untested"]},{"year":2022,"claim":"Tied FGD5's RhoGEF/Rac1 catalytic activity directly to CXCR4-dependent PI3K-β signaling and defined a basal-cell ATF3-CXCL14-CXCR4/ERK-hedgehog axis driving mammary ductal morphogenesis, plus marked an IFN-γ-resistant HSC subset.","evidence":"RhoGEF-deficient mutant rescue and Rac1 inhibition epistasis; conditional KO/KI mouse models with pathway dissection; Fgd5 reporter mice with IFN-γ stimulation","pmids":["34882832","38821057","35768035"],"confidence":"High","gaps":["How FGD5 suppresses ATF3 transcriptional activity mechanistically unknown","Molecular basis of IFN-γ resistance in Fgd5+ HSCs uncharacterized"]},{"year":null,"claim":"Whether FGD5's GTPase specificity (Rac1 vs Cdc42) is context-switched and how its receptor-stabilization and GEF functions are mechanistically integrated remain open.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of FGD5 engaging both receptor cargo and GTPase substrate","Determinants selecting Rac1 versus Cdc42 in vivo undefined","FGD5's intrinsic function within HSCs still unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,4,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,3]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,9,6]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,8]}],"complexes":[],"partners":["VEGFR2","CDC42","RAC1","EGFR","CXCR4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6ZNL6","full_name":"FYVE, RhoGEF and PH domain-containing protein 5","aliases":["Zinc finger FYVE domain-containing protein 23"],"length_aa":1462,"mass_kda":159.9,"function":"Activates CDC42, a member of the Ras-like family of Rho- and Rac proteins, by exchanging bound GDP for free GTP. Mediates VEGF-induced CDC42 activation. May regulate proangiogenic action of VEGF in vascular endothelial cells, including network formation, directional movement and proliferation. May play a role in regulating the actin cytoskeleton and cell shape","subcellular_location":"Cytoplasm, cytoskeleton; Cell projection, ruffle membrane; Endoplasmic reticulum; Golgi apparatus; Early endosome","url":"https://www.uniprot.org/uniprotkb/Q6ZNL6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FGD5","classification":"Not Classified","n_dependent_lines":76,"n_total_lines":1208,"dependency_fraction":0.06291390728476821},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FGD5","total_profiled":1310},"omim":[{"mim_id":"614788","title":"FYVE, RhoGEF, AND PH DOMAIN-CONTAINING PROTEIN 5; FGD5","url":"https://www.omim.org/entry/614788"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/FGD5"},"hgnc":{"alias_symbol":["ZFYVE23","FLJ39957","FLJ00274"],"prev_symbol":[]},"alphafold":{"accession":"Q6ZNL6","domains":[{"cath_id":"1.20.900.10","chopping":"892-1107","consensus_level":"medium","plddt":90.145,"start":892,"end":1107},{"cath_id":"2.30.29.30","chopping":"1115-1207","consensus_level":"medium","plddt":90.2886,"start":1115,"end":1207},{"cath_id":"3.30.40.10","chopping":"1229-1303","consensus_level":"medium","plddt":86.9701,"start":1229,"end":1303},{"cath_id":"2.30.29.30","chopping":"1355-1460","consensus_level":"high","plddt":85.3546,"start":1355,"end":1460}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6ZNL6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6ZNL6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6ZNL6-F1-predicted_aligned_error_v6.png","plddt_mean":53.41},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FGD5","jax_strain_url":"https://www.jax.org/strain/search?query=FGD5"},"sequence":{"accession":"Q6ZNL6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6ZNL6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6ZNL6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6ZNL6"}},"corpus_meta":[{"pmid":"35718269","id":"PMC_35718269","title":"Exosome-derived FGD5-AS1 promotes tumor-associated macrophage M2 polarization-mediated pancreatic cancer cell proliferation and metastasis.","date":"2022","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/35718269","citation_count":173,"is_preprint":false},{"pmid":"24958848","id":"PMC_24958848","title":"Fgd5 identifies hematopoietic stem cells in the murine bone marrow.","date":"2014","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/24958848","citation_count":161,"is_preprint":false},{"pmid":"31332696","id":"PMC_31332696","title":"Long noncoding RNA FGD5-AS1 promotes colorectal cancer cell proliferation, migration, and invasion through upregulating CDCA7 via sponging miR-302e.","date":"2019","source":"In vitro cellular & developmental biology. 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retina model); direct binding assay for Cdc42 activation\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal in vitro and in vivo functional assays with both loss- and gain-of-function, direct Cdc42 binding and pathway (hey1-p53) identification\",\n      \"pmids\": [\"22661514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"FGD5 is selectively expressed in human vascular endothelial cells, localizes to peripheral membrane ruffles and perinuclear regions, activates Cdc42, and mediates VEGF-induced activation of Cdc42 and ERK. Knockdown attenuates VEGF-promoted capillary-like network formation, permeability, directional movement, proliferation, and Golgi reorientation.\",\n      \"method\": \"Immunofluorescence microscopy (subcellular localization); siRNA knockdown with functional assays (network formation, permeability, directional movement, proliferation assays); overexpression Cdc42 activity assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional readouts with subcellular localization and downstream signaling, replicated across multiple endothelial assay types\",\n      \"pmids\": [\"22328776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Fgd5 is required for embryonic development but is not required for definitive hematopoiesis or HSC function. Reporter knock-in mice demonstrate that Fgd5 expression near-exclusively labels HSCs in the bone marrow, and an Fgd5-CreERT2 allele allows tamoxifen-inducible HSC-specific deletion.\",\n      \"method\": \"Targeted reporter knock-in/knock-out alleles in mice; bone marrow transplantation (HSC activity assay); Fgd5-CreERT2 tamoxifen-inducible conditional deletion\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knock-in/knock-out with functional transplantation assay and CreERT2 tool, replicated across multiple reporter experiments\",\n      \"pmids\": [\"24958848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FGD5 localizes to the inner surface of the cell membrane and the outer surface of EEA1-positive endosomes carrying VEGFR2. FGD5 depletion accelerates VEGFR2 degradation via the proteasome (rescued by lactacystin), inhibiting endothelial cell migration toward VEGFA gradients, thus sustaining VEGFA signaling by inhibiting proteasome-mediated VEGFR2 degradation.\",\n      \"method\": \"Immunofluorescence colocalization (FGD5 and EEA1/VEGFR2 on endosomes); siRNA knockdown; VEGFR2 degradation assay with proteasomal inhibitor lactacystin; chemotaxis migration assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular localization with functional consequence, proteasomal inhibitor rescue experiment, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"28927665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FGD5 forms a complex with VEGFR2 (co-immunoprecipitation) in resting and VEGF-stimulated endothelial cells, is enriched at the leading edge and endosomes, and loss of FGD5 reduces endosomal VEGFR2 coupling to PI3 kinase and diverts VEGFR2 to lysosomal degradation. FGD5 loss reduces mTORC2/Akt-dependent cortactin activation but does not alter VEGFR2 plasma membrane expression, Y1175 phosphorylation, or endocytosis.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence; 3D sprouting angiogenesis assay; siRNA knockdown; Western blot for PI3K/mTORC2/Akt/cortactin signaling\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, subcellular localization, multiple signaling readouts in single lab with rigorous controls identifying negative results\",\n      \"pmids\": [\"29051140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Purified FGD5 preferentially activates Rac1 (not Cdc42) as shown by GEF enzyme assay; Rac1 directly binds FGD5 in pull-down and co-immunoprecipitation assays. The FGD5 DH domain is structurally homologous to the Rac1 GEF TrioN. Aurintricarboxylic acid selectively inhibits FGD5 GEF activity and Rac1 interaction without affecting TrioN.\",\n      \"method\": \"In vitro GEF enzyme assay with purified Fgd5; GST pull-down; co-immunoprecipitation; surface plasmon resonance small-molecule screen; structural comparison of DH domain\",\n      \"journal\": \"Small GTPases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution GEF assay with purified protein, orthogonal binding assays, selective inhibitor validation; single lab but multiple rigorous methods\",\n      \"pmids\": [\"31601145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"VE-PTP inhibition and Tie-2 activation induce tyrosine phosphorylation of FGD5 at Y820 (directly dephosphorylated by VE-PTP) and stimulate FGD5 translocation to cell contacts. FGD5 phosphorylation at Y820 is required for junction stabilization and Cdc42 activation by VE-PTP inhibition, but not for recruitment to cell contacts. FGD5 activation is a two-step process: membrane recruitment followed by Y820 phosphorylation.\",\n      \"method\": \"Phosphorylation mapping (Y820 mutagenesis); immunofluorescence (FGD5 translocation); in vitro and in vivo endothelial permeability assays; siRNA knockdown; actin cytoskeleton analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-specific mutagenesis (Y820) identifying writer (VE-PTP/Tie-2), functional rescue assays in vitro and in vivo, multiple orthogonal readouts across cell junctions and Cdc42 activity\",\n      \"pmids\": [\"31267715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FGD5 interacts with EGFR (co-immunoprecipitation) in gastric cancer cells, decreases EGFR ubiquitination, and sustains activation of EGFR downstream signaling (STAT3/pSTAT3). FGD5 knockdown inhibits tumorigenesis and migration in vivo and in vitro; FGD5 expression is associated with tumor stage.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; shRNA knockdown; immunofluorescence; in vivo xenograft; Western blot for STAT3 signaling\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — co-IP identifying EGFR interaction and ubiquitination assay in single lab, functional loss-of-function with defined signaling readout\",\n      \"pmids\": [\"34034092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FGD5 is enriched in mammary basal cells (BCs) and inhibits the transcriptional activity of ATF3, leading to transcriptional activation and secretion of CXCL14. CXCL14 then activates CXCR4/ERK signaling in mammary stromal endothelial cells, enhancing HIF-1α-regulated hedgehog ligand expression, creating a positive feedback loop promoting BC function. Conditional Fgd5 deletion reduced BC engraftment and ductal morphogenesis; conditional knockin increased them.\",\n      \"method\": \"Conditional deletion and knockin mouse models; mechanistic assays (ATF3 transcriptional activity, CXCL14/CXCR4/ERK signaling); ductal morphogenesis quantification\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO and KI in mice with defined cellular phenotype, pathway dissection via ATF3/CXCL14/CXCR4/ERK axis, multiple orthogonal functional readouts\",\n      \"pmids\": [\"38821057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FGD5 regulates endothelial CXCR4-dependent PI3 kinase-β signaling. FGD5 loss abolishes CXCL12-stimulated PI3K-β and Akt activation. A RhoGEF-deficient (Dbl domain-deleted) FGD5 mutant failed to rescue PI3K signaling, indicating that FGD5's RhoGEF activity (generating Rac1-GTP) is required for CXCR4-dependent PI3K-β activation. Inhibition of Rac1 recapitulated FGD5 deficiency signaling defects.\",\n      \"method\": \"siRNA knockdown; RhoGEF-deficient mutant overexpression; Rac1 inhibition; Akt/PI3K-β phosphorylation assays; sprouting angiogenesis ex vivo; PI3K-β mutant with inactivated Rho-binding domain\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-deletion mutagenesis combined with epistasis (Rac1 inhibition) and signaling rescue assays establishing mechanistic pathway in single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"34882832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FGD5 marks a subset of HSCs that do not divide or differentiate in response to IFN-γ, suggesting FGD5 identifies an IFN-γ-resistant HSC subpopulation that may preserve the HSC compartment during emergency hematopoiesis.\",\n      \"method\": \"Fgd5 reporter mice; IFN-γ stimulation; division/differentiation assays on Fgd5+ vs Fgd5- HSC populations\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic reporter system with functional stimulation assay, single lab, limited mechanistic depth\",\n      \"pmids\": [\"35768035\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FGD5 is an endothelial-enriched Rho-family guanine nucleotide exchange factor (GEF) that activates both Cdc42 and Rac1 to regulate VEGF/VEGFR2 and CXCR4 signaling: it forms a complex with VEGFR2 on recycling endosomes to prevent proteasomal degradation and maintain PI3K/mTORC2/Akt-dependent cytoskeletal remodeling; its GEF activity (Rac1-GTP generation) drives CXCR4-dependent PI3K-β activation; it is tyrosine-phosphorylated at Y820 downstream of Tie-2/VE-PTP to stabilize endothelial junctions via Cdc42; it also promotes apoptosis-induced vascular pruning via the hey1-p53 pathway; outside the vasculature, FGD5 marks a quiescent, IFN-γ-resistant HSC subpopulation and, in mammary basal cells, suppresses ATF3 to drive CXCL14 secretion and a hedgehog-mediated endothelial feedback loop supporting ductal morphogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FGD5 is an endothelial-enriched Rho-family guanine nucleotide exchange factor that couples vascular growth-factor receptor signaling to actin remodeling, junction stability, and vascular pruning [#1, #0]. Purified FGD5 acts through a DH (Dbl-homology) domain to load GTP onto Rho-family GTPases; in vitro reconstitution shows it preferentially activates Rac1, while in endothelial cells it also drives Cdc42 activation downstream of VEGF [#5, #1]. A central function is the stabilization of VEGFR2: FGD5 localizes to EEA1-positive recycling endosomes where it forms a complex with VEGFR2, protecting the receptor from proteasomal and lysosomal degradation and sustaining endosomal VEGFR2 coupling to PI3K/mTORC2/Akt-dependent cortactin activation and directional migration [#3, #4]. Its RhoGEF-generated Rac1-GTP is likewise required for endothelial CXCR4/CXCL12-driven PI3K-\\u03b2 and Akt signaling [#9]. FGD5 is integrated into junctional control as a two-step process—membrane recruitment followed by Y820 tyrosine phosphorylation downstream of Tie-2/VE-PTP—that activates Cdc42 to stabilize endothelial cell contacts [#6], and it conversely promotes apoptosis-induced vascular pruning via the hey1-p53 pathway [#0]. Beyond the vasculature, genetic reporter and conditional alleles establish FGD5 as a near-exclusive marker of bone-marrow HSCs, including an IFN-\\u03b3-resistant quiescent subpopulation [#2, #10], and in mammary basal cells FGD5 suppresses ATF3 to induce CXCL14 secretion, engaging a CXCR4/ERK-hedgehog endothelial feedback loop that supports ductal morphogenesis [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established FGD5 as an endothelial Cdc42 activator whose function determines whether vessels grow or are pruned, defining its first vascular role.\",\n      \"evidence\": \"Loss/gain-of-function in vitro and in vivo angiogenesis assays plus direct Cdc42 binding and hey1-p53 pathway identification in endothelial cells\",\n      \"pmids\": [\"22661514\", \"22328776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether FGD5 GEF specificity is restricted to Cdc42\", \"Mechanism linking GEF activity to hey1-p53 induction not detailed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined FGD5 expression as a near-exclusive HSC marker and built genetic tools (reporter, CreERT2) for HSC tracing, separating its dispensable role in hematopoiesis from a requirement in embryonic development.\",\n      \"evidence\": \"Targeted reporter knock-in/knock-out alleles, bone marrow transplantation, and tamoxifen-inducible conditional deletion in mice\",\n      \"pmids\": [\"24958848\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular function of FGD5 within HSCs not addressed\", \"Cause of embryonic requirement not mechanistically defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed FGD5 stabilizes VEGFR2 on endosomes by blocking proteasomal/lysosomal degradation and sustaining PI3K/mTORC2/Akt-cortactin signaling, identifying a receptor-trafficking function distinct from its GEF role.\",\n      \"evidence\": \"Endosomal colocalization (EEA1/VEGFR2), proteasome inhibitor rescue, co-immunoprecipitation, and 3D sprouting/chemotaxis assays in endothelial cells\",\n      \"pmids\": [\"28927665\", \"29051140\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FGD5-VEGFR2 binding is direct or bridged not established\", \"Relationship between trafficking function and GEF catalysis unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Reconstituted FGD5 catalysis with purified protein showing preferential Rac1 (not Cdc42) activation, and identified Y820 phosphorylation downstream of Tie-2/VE-PTP as a junction-stabilizing activation step.\",\n      \"evidence\": \"In vitro GEF enzyme assay, pull-down/co-IP, selective inhibitor screen, and Y820 mutagenesis with permeability and Cdc42 activity assays\",\n      \"pmids\": [\"31601145\", \"31267715\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro Rac1 preference versus cellular Cdc42 activation not fully reconciled\", \"Kinase directly phosphorylating Y820 not identified\", \"Recruitment signal preceding Y820 phosphorylation undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended the receptor-stabilization mechanism beyond the vasculature, showing FGD5 binds EGFR and reduces its ubiquitination to sustain STAT3 signaling in gastric cancer.\",\n      \"evidence\": \"Co-immunoprecipitation, ubiquitination assay, shRNA knockdown, and xenograft tumorigenesis with STAT3 readout\",\n      \"pmids\": [\"34034092\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab co-IP without reciprocal validation in independent systems\", \"Whether GEF activity contributes to EGFR stabilization untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Tied FGD5's RhoGEF/Rac1 catalytic activity directly to CXCR4-dependent PI3K-\\u03b2 signaling and defined a basal-cell ATF3-CXCL14-CXCR4/ERK-hedgehog axis driving mammary ductal morphogenesis, plus marked an IFN-\\u03b3-resistant HSC subset.\",\n      \"evidence\": \"RhoGEF-deficient mutant rescue and Rac1 inhibition epistasis; conditional KO/KI mouse models with pathway dissection; Fgd5 reporter mice with IFN-\\u03b3 stimulation\",\n      \"pmids\": [\"34882832\", \"38821057\", \"35768035\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How FGD5 suppresses ATF3 transcriptional activity mechanistically unknown\", \"Molecular basis of IFN-\\u03b3 resistance in Fgd5+ HSCs uncharacterized\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether FGD5's GTPase specificity (Rac1 vs Cdc42) is context-switched and how its receptor-stabilization and GEF functions are mechanistically integrated remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of FGD5 engaging both receptor cargo and GTPase substrate\", \"Determinants selecting Rac1 versus Cdc42 in vivo undefined\", \"FGD5's intrinsic function within HSCs still unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005085\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 4, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 9, 6]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"VEGFR2\", \"Cdc42\", \"Rac1\", \"EGFR\", \"CXCR4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}