{"gene":"ADGRA2","run_date":"2026-06-09T22:02:41","timeline":{"discoveries":[{"year":2011,"finding":"Global or endothelial-specific deletion of GPR124 (ADGRA2) in mice causes embryonic lethality associated with defective angiogenesis of the forebrain and spinal cord, failure of blood vessel invasion into neuroepithelium, loss of BBB properties (including Glut-1 expression), and impaired cerebral cortex expansion, establishing ADGRA2 as a cell-autonomous endothelial regulator of CNS-specific vascularization and BBB formation.","method":"Conditional and global knockout mouse models with histological, immunostaining, and barrier marker readouts","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — endothelial-specific KO with defined cellular phenotypes, replicated in global KO; foundational genetic epistasis paper","pmids":["21421844"],"is_preprint":false},{"year":2006,"finding":"TEM5 (ADGRA2) is proteolytically shed from endothelial cells during capillary morphogenesis as a soluble fragment (sTEM5) by MMP-9. Further proteolytic processing exposes a cryptic RGD motif that directly engages integrin αvβ3, and this interaction promotes survival of growth-factor-deprived endothelial cells. sTEM5 also binds glycosaminoglycans, and glycosaminoglycan-bound processed sTEM5 retains αvβ3-mediated pro-survival activity.","method":"In vitro endothelial capillary formation assay, biochemical shedding assay, recombinant protein binding studies, function-blocking αvβ3 antibody, cell adhesion and survival assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution of binding, enzymatic processing, functional neutralization with antibody, multiple orthogonal methods in single study","pmids":["16982628"],"is_preprint":false},{"year":2004,"finding":"The PDZ domains of hDlg (human Discs large) directly bind the C-terminal PDZ-binding motif of TEM5 (ADGRA2), and hDlg co-localizes with TEM5 in endothelial cells of embryonic liver, suggesting hDlg is scaffolded to the plasma membrane via TEM5.","method":"Direct binding assay (pulldown), co-localization by immunostaining in embryonic tissue sections","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct pulldown and co-localization reported, single lab, two methods but no reciprocal Co-IP or mutagenesis validation","pmids":["15021905"],"is_preprint":false},{"year":2009,"finding":"TEM5 (ADGRA2) expression in endothelial cells is induced during capillary morphogenesis by the small GTPase Rac (not Rho), as shown by pharmacological inhibitor dissection. TEM5 mediates contact inhibition of endothelial cell proliferation: blockade with a soluble extracellular domain or inhibitory antibody abolished contact inhibition, resulting in multilayered islands and increased vessel density.","method":"Matrigel and 3D collagen capillary formation assays, GTPase inhibitors (toxin B, C3 transferase, NSC23766), inhibitory antibody and soluble domain competition, proliferation assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — pharmacological pathway dissection and functional antibody blockade, single lab, multiple methods","pmids":["19853600"],"is_preprint":false},{"year":2012,"finding":"Thrombin directly cleaves TEM5 (ADGRA2) 5 and 34 residues downstream of its RGD motif, generating a shed N-terminal 60 kDa fragment (N60) containing an open RGD conformation. Cell-surface protein disulfide-isomerase (PDI) is required for this shedding: PDI inhibition abrogated N60 release, while addition of reduced PDI enhanced cleavage and dissociation of the N60–C50 disulfide-linked heterodimer.","method":"In vitro thrombin cleavage of recombinant soluble TEM5, cell-based shedding assay with PDI inhibitor/activator, disulfide bond analysis by immunoprecipitation","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution of protease cleavage, cell-based validation, enzymatic mechanism identified with inhibitor/activator experiments, single lab","pmids":["22013897"],"is_preprint":false},{"year":2017,"finding":"GPR124 (ADGRA2) promotes cell adhesion and activates Rac and Cdc42 GTPases. It forms direct complexes with the Rho-GEFs Elmo/Dock and intersectin-1 (ITSN1), and Gβγ interacts with the C-terminal tail of GPR124 to promote GPR124–Elmo complex formation. GPR124 activates the Elmo–Dock complex as measured by Elmo phosphorylation on a conserved C-terminal tyrosine. Small fragments of Elmo or ITSN1 that bind GPR124 block GPR124-induced cell adhesion. Endogenous phospho-Elmo and ITSN1 co-localize with GPR124 at lamellipodia of adhering endothelial cells where GPR124 contributes to polarity during wound healing.","method":"Co-immunoprecipitation of endogenous proteins, ectopic expression studies, GTPase activation assays (Rac/Cdc42), dominant-negative fragment competition, phosphorylation assay, immunofluorescence co-localization, wound-healing assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP of endogenous proteins, multiple functional assays, GTPase activation, dominant-negative validation, localization with functional consequence; single lab but multiple orthogonal methods","pmids":["28600358"],"is_preprint":false},{"year":2017,"finding":"WNT7B-mediated synergistic β-catenin signaling requires GPR124 (ADGRA2) together with FZD5, FZD8, LRP6, and RECK as co-receptors. Synergistic signaling occurs downstream of β-catenin stabilization and correlates with increased lysine acetylation of β-catenin.","method":"Luciferase β-catenin reporter assays, receptor requirement tested by siRNA knockdown and dominant-negative constructs, co-expression studies in multiple cell types, β-catenin acetylation biochemistry","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reporter assays and knockdown in multiple cell types, single lab; downstream signaling mechanism partially characterized","pmids":["28289266"],"is_preprint":false},{"year":2016,"finding":"The LRR (leucine-rich repeat) domain of Adgra2 (GPR124) is required for proper receptor trafficking to the plasma membrane; loss of a single LRR unit causes receptor mis-trafficking and functional loss. Adgra2 trafficking to the plasma membrane occurs independently of Reck, and Reck reaches the plasma membrane independently of Adgra2, indicating the two partners traffic separately and meet at the cell surface.","method":"Characterization of ENU-induced ouchless zebrafish splice allele, CRISPR/Cas9-engineered cell lines, subcellular localization assays, genetic complementation of adgra2 mutants","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO cells and zebrafish genetic allele with direct localization readout; single lab, two orthogonal systems","pmids":["27979830"],"is_preprint":false},{"year":2016,"finding":"An ENU-induced splice site mutation in adgra2 (gpr124), not in sorbs3 as previously attributed, underlies the ouchless zebrafish phenotype, which includes dorsal root ganglia formation defects and highly penetrant cerebrovascular defects. The aberrant transcript encodes a receptor missing one LRR unit.","method":"Genetic complementation test with characterized adgra2 mutants, RT-PCR splice analysis, sequencing of ouchless allele","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic complementation and molecular characterization; single lab, clear allelic assignment","pmids":["27979884"],"is_preprint":false},{"year":2014,"finding":"GPR124 (ADGRA2) is required for VEGF-induced tumor angiogenesis: siRNA silencing of GPR124 in human endothelial cells inhibited xenograft tumor angiogenic vessel formation, tumor growth, and VEGF-induced endothelial processes including cell–cell interaction, permeability, migration, invasion, and tube formation in vitro.","method":"siRNA knockdown in human endothelial cells, xenograft tumor model, in vitro angiogenesis assays (migration, invasion, tube formation, permeability)","journal":"Current molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — loss-of-function in vitro and in vivo, multiple functional readouts; single lab","pmids":["24730523"],"is_preprint":false}],"current_model":"ADGRA2 (GPR124/TEM5) is an adhesion GPCR expressed on endothelial cells that acts as an obligate endothelial-cell-autonomous co-receptor (with RECK) for WNT7A/7B-driven canonical Wnt/β-catenin signaling, driving CNS-specific angiogenesis and blood-brain barrier formation; it promotes cell adhesion and cytoskeletal remodeling by coupling Gβγ to a Elmo–Dock/intersectin-1 Rho-GEF complex activating Rac and Cdc42, mediates contact inhibition of endothelial proliferation in a Rac-dependent manner, is shed proteolytically by MMP-9 and thrombin (the latter regulated by cell-surface PDI) to expose a cryptic RGD motif that engages integrin αvβ3 for endothelial survival, and traffics to the plasma membrane via its LRR domain independently of its co-receptor RECK where it is scaffolded by hDlg through a C-terminal PDZ-binding motif."},"narrative":{"mechanistic_narrative":"ADGRA2 (GPR124/TEM5) is an endothelial adhesion GPCR that functions as a cell-autonomous regulator of CNS-specific angiogenesis and blood-brain barrier formation, as established by global and endothelial-specific knockout mice that die embryonically with defective forebrain and spinal cord vascularization, failed vessel invasion of the neuroepithelium, and loss of barrier markers including Glut-1 [PMID:21421844]. Its CNS angiogenic role is mediated through canonical Wnt signaling: ADGRA2 acts as a co-receptor that, together with FZD5, FZD8, LRP6, and RECK, drives WNT7B-mediated synergistic β-catenin signaling downstream of β-catenin stabilization, correlating with increased β-catenin acetylation [PMID:28289266]. ADGRA2 and RECK traffic to the plasma membrane independently and meet at the cell surface, with the leucine-rich repeat domain required for correct receptor trafficking [PMID:27979830, PMID:27979884]. At the membrane, ADGRA2 promotes adhesion and cytoskeletal remodeling by coupling Gβγ to a Rho-GEF module: it forms direct complexes with Elmo/Dock and intersectin-1, activates Rac and Cdc42, and concentrates with phospho-Elmo and ITSN1 at lamellipodia to direct polarity during migration [PMID:28600358]. ADGRA2 also mediates Rac-dependent contact inhibition of endothelial proliferation [PMID:19853600] and is required for VEGF-induced tumor angiogenesis [PMID:24730523]. The receptor is proteolytically shed by MMP-9 and by thrombin—the latter requiring cell-surface protein disulfide-isomerase—to expose a cryptic RGD motif that engages integrin αvβ3 and supports survival of growth-factor-deprived endothelial cells [PMID:16982628, PMID:22013897]. Its C-terminal PDZ-binding motif recruits the scaffold hDlg to the membrane [PMID:15021905].","teleology":[{"year":2004,"claim":"Established that ADGRA2 has an intracellular scaffolding output, linking the receptor's C-terminus to a membrane-associated guanylate kinase scaffold.","evidence":"Direct pulldown of hDlg PDZ domains by the TEM5 C-terminal PDZ-binding motif plus co-localization in embryonic liver endothelium","pmids":["15021905"],"confidence":"Medium","gaps":["No reciprocal Co-IP or mutagenesis of the PDZ motif","Functional consequence of hDlg scaffolding not defined"]},{"year":2006,"claim":"Defined an integrin-coupled extracellular function, showing that proteolytic shedding converts ADGRA2 into a pro-survival ligand via a cryptic RGD motif.","evidence":"In vitro capillary assays, MMP-9 shedding, recombinant binding, function-blocking αvβ3 antibody, survival assays","pmids":["16982628"],"confidence":"High","gaps":["Relationship between shed-fragment signaling and full-length receptor signaling unresolved","In vivo relevance of αvβ3 engagement not demonstrated"]},{"year":2009,"claim":"Connected ADGRA2 to GTPase control of endothelial growth, identifying Rac as both an inducer of its expression and an effector of its contact-inhibition function.","evidence":"Capillary morphogenesis assays with GTPase inhibitors and antibody/soluble-domain blockade, proliferation assays","pmids":["19853600"],"confidence":"Medium","gaps":["Molecular link between receptor and Rac not yet defined at this stage","Pharmacological inhibitor specificity limits conclusions"]},{"year":2011,"claim":"Established the cell-autonomous, organ-specific physiological role, showing ADGRA2 is essential for CNS angiogenesis and BBB formation.","evidence":"Global and endothelial-specific knockout mice with histology, immunostaining, and barrier-marker readouts","pmids":["21421844"],"confidence":"High","gaps":["Did not identify the ligand or downstream signaling pathway","Mechanism of CNS specificity not defined"]},{"year":2012,"claim":"Refined the shedding mechanism, identifying thrombin as a protease and cell-surface PDI as a regulator that controls RGD exposure.","evidence":"In vitro thrombin cleavage of recombinant TEM5, cell-based shedding with PDI inhibitor/activator, disulfide bond analysis","pmids":["22013897"],"confidence":"High","gaps":["In vivo contribution of thrombin/PDI-dependent shedding unknown","How PDI accesses the heterodimer disulfide not structurally resolved"]},{"year":2014,"claim":"Extended ADGRA2 function to pathological angiogenesis, showing it is required for VEGF-driven tumor vessel formation.","evidence":"siRNA knockdown in human endothelial cells, xenograft tumor model, in vitro angiogenesis assays","pmids":["24730523"],"confidence":"Medium","gaps":["Mechanistic link between ADGRA2 and VEGF signaling not defined","Single lab, knockdown-based"]},{"year":2016,"claim":"Assigned the ouchless phenotype to adgra2 and showed the LRR domain governs receptor trafficking independently of RECK.","evidence":"ENU splice allele characterization, genetic complementation, CRISPR cell lines, subcellular localization assays in zebrafish and cells","pmids":["27979830","27979884"],"confidence":"Medium","gaps":["How the LRR mediates trafficking mechanistically unknown","Where/how ADGRA2 and RECK assemble at the surface not resolved"]},{"year":2017,"claim":"Defined the receptor's proximal signaling output, showing Gβγ-dependent coupling to Elmo/Dock and ITSN1 Rho-GEFs activates Rac and Cdc42 for adhesion and polarity.","evidence":"Reciprocal endogenous Co-IP, GTPase activation assays, dominant-negative fragment competition, Elmo phosphorylation, lamellipodial co-localization, wound healing","pmids":["28600358"],"confidence":"High","gaps":["Activating ligand for the Gβγ output not identified","Integration with the Wnt co-receptor function unclear"]},{"year":2017,"claim":"Placed ADGRA2 within canonical Wnt signaling, showing it acts with FZD/LRP6/RECK as a co-receptor for WNT7B-driven β-catenin activation.","evidence":"β-catenin luciferase reporters, siRNA and dominant-negative receptor requirement tests, multi-cell-type co-expression, β-catenin acetylation biochemistry","pmids":["28289266"],"confidence":"Medium","gaps":["Functional significance of β-catenin acetylation not established","How co-receptor assembly is spatially organized unknown"]},{"year":null,"claim":"How the Wnt co-receptor activity and the Gβγ/Rho-GEF adhesion output are mechanistically integrated, and what physiological agonist engages the receptor, remain open.","evidence":"No single discovery in the timeline unifies these two outputs","pmids":[],"confidence":"Low","gaps":["No structural model of the receptor or its co-receptor complex","Endogenous activating ligand for the GPCR signaling arm undefined","Cross-talk between shedding, Wnt, and Rho-GEF arms unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[5,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,6]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[1,5]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,5,7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,6]}],"complexes":[],"partners":["RECK","ELMO1","ITSN1","DLG1","ITGAV","ITGB3","LRP6","FZD8"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96PE1","full_name":"Adhesion G protein-coupled receptor A2","aliases":["G-protein coupled receptor 124","Tumor endothelial marker 5"],"length_aa":1338,"mass_kda":142.6,"function":"Endothelial receptor which functions together with RECK to enable brain endothelial cells to selectively respond to Wnt7 signals (WNT7A or WNT7B) (PubMed:28289266, PubMed:30026314). Plays a key role in Wnt7-specific responses, such as endothelial cell sprouting and migration in the forebrain and neural tube, and establishment of the blood-brain barrier (By similarity). Acts as a Wnt7-specific coactivator of canonical Wnt signaling: required to deliver RECK-bound Wnt7 to frizzled by assembling a higher-order RECK-ADGRA2-Fzd-LRP5-LRP6 complex (PubMed:30026314). ADGRA2-tethering function does not rely on its G-protein coupled receptor (GPCR) structure but instead on its combined capacity to interact with RECK extracellularly and recruit the Dishevelled scaffolding protein intracellularly (PubMed:30026314). Binds to the glycosaminoglycans heparin, heparin sulfate, chondroitin sulfate and dermatan sulfate (PubMed:16982628)","subcellular_location":"Cell membrane; Cell projection, filopodium","url":"https://www.uniprot.org/uniprotkb/Q96PE1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ADGRA2","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ADGRA2","total_profiled":1310},"omim":[{"mim_id":"606823","title":"ADHESION G PROTEIN-COUPLED RECEPTOR A2; ADGRA2","url":"https://www.omim.org/entry/606823"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ADGRA2"},"hgnc":{"alias_symbol":["TEM5","DKFZp434C211","DKFZp434J0911","KIAA1531","FLJ14390"],"prev_symbol":["GPR124"]},"alphafold":{"accession":"Q96PE1","domains":[{"cath_id":"3.80.10.10","chopping":"41-51_62-242","consensus_level":"medium","plddt":88.5061,"start":41,"end":242},{"cath_id":"2.60.40.10","chopping":"249-347","consensus_level":"medium","plddt":87.5514,"start":249,"end":347},{"cath_id":"2.60.220.50","chopping":"532-566_589-663_671-758","consensus_level":"medium","plddt":80.1281,"start":532,"end":758},{"cath_id":"1.20.1070.10","chopping":"773-866_885-951_1012-1080","consensus_level":"high","plddt":90.0341,"start":773,"end":1080},{"cath_id":"2.10.70","chopping":"353-385_397-414","consensus_level":"medium","plddt":84.3392,"start":353,"end":414},{"cath_id":"1.25.40","chopping":"425-527","consensus_level":"medium","plddt":91.4417,"start":425,"end":527}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PE1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PE1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PE1-F1-predicted_aligned_error_v6.png","plddt_mean":69.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ADGRA2","jax_strain_url":"https://www.jax.org/strain/search?query=ADGRA2"},"sequence":{"accession":"Q96PE1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96PE1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96PE1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PE1"}},"corpus_meta":[{"pmid":"25713288","id":"PMC_25713288","title":"International Union of Basic and Clinical Pharmacology. 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Stability to beta-lactamases and affinity for penicillin-binding proteins.","date":"1992","source":"The Journal of antibiotics","url":"https://pubmed.ncbi.nlm.nih.gov/1592684","citation_count":2,"is_preprint":false},{"pmid":"29462671","id":"PMC_29462671","title":"Expression of the adhesion G protein-coupled receptor A2 (adgra2) during Xenopus laevis development.","date":"2018","source":"Gene expression patterns : GEP","url":"https://pubmed.ncbi.nlm.nih.gov/29462671","citation_count":1,"is_preprint":false},{"pmid":"39717325","id":"PMC_39717325","title":"A Rare Case of Polymicrogyria in an Elderly Individual With Unique Polygenic Underlining.","date":"2024","source":"Cureus","url":"https://pubmed.ncbi.nlm.nih.gov/39717325","citation_count":1,"is_preprint":false},{"pmid":"39778540","id":"PMC_39778540","title":"A Comparative Study on the Progression of Neuroendocrine Carcinomas and Mixed Neuroendocrine-Non-Neuroendocrine Neoplasms.","date":"2025","source":"Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/39778540","citation_count":1,"is_preprint":false},{"pmid":"39553307","id":"PMC_39553307","title":"The Mechanism by Which Hedgehog Interacting Protein (HHIP) in Cancer-Associated Fibroblasts Regulate the Secretion of Inflammatory Factors Through the JAK1/STAT3 Pathway Affecting Prostate Cancer Stemness.","date":"2024","source":"Journal of inflammation research","url":"https://pubmed.ncbi.nlm.nih.gov/39553307","citation_count":1,"is_preprint":false},{"pmid":"41826520","id":"PMC_41826520","title":"Integrated Liquid Biopsy and Tumor Tissue Genomic Profiling of Appendiceal Cancer: cfDNA Burden, Mutation Landscapes, and Clinical Outcomes.","date":"2026","source":"Annals of surgical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/41826520","citation_count":0,"is_preprint":false},{"pmid":"41387293","id":"PMC_41387293","title":"Primary Cutaneous CD30-Positive Lymphoproliferative Disorder With Gamma-Delta T-Cells: A Molecular-Annotated Case With a Classic Clinical Appearance and Behavior.","date":"2025","source":"Journal of cutaneous pathology","url":"https://pubmed.ncbi.nlm.nih.gov/41387293","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22971,"output_tokens":2987,"usd":0.056859,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10371,"output_tokens":3292,"usd":0.067077,"stage2_stop_reason":"end_turn"},"total_usd":0.123936,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"Global or endothelial-specific deletion of GPR124 (ADGRA2) in mice causes embryonic lethality associated with defective angiogenesis of the forebrain and spinal cord, failure of blood vessel invasion into neuroepithelium, loss of BBB properties (including Glut-1 expression), and impaired cerebral cortex expansion, establishing ADGRA2 as a cell-autonomous endothelial regulator of CNS-specific vascularization and BBB formation.\",\n      \"method\": \"Conditional and global knockout mouse models with histological, immunostaining, and barrier marker readouts\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — endothelial-specific KO with defined cellular phenotypes, replicated in global KO; foundational genetic epistasis paper\",\n      \"pmids\": [\"21421844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TEM5 (ADGRA2) is proteolytically shed from endothelial cells during capillary morphogenesis as a soluble fragment (sTEM5) by MMP-9. Further proteolytic processing exposes a cryptic RGD motif that directly engages integrin αvβ3, and this interaction promotes survival of growth-factor-deprived endothelial cells. sTEM5 also binds glycosaminoglycans, and glycosaminoglycan-bound processed sTEM5 retains αvβ3-mediated pro-survival activity.\",\n      \"method\": \"In vitro endothelial capillary formation assay, biochemical shedding assay, recombinant protein binding studies, function-blocking αvβ3 antibody, cell adhesion and survival assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution of binding, enzymatic processing, functional neutralization with antibody, multiple orthogonal methods in single study\",\n      \"pmids\": [\"16982628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The PDZ domains of hDlg (human Discs large) directly bind the C-terminal PDZ-binding motif of TEM5 (ADGRA2), and hDlg co-localizes with TEM5 in endothelial cells of embryonic liver, suggesting hDlg is scaffolded to the plasma membrane via TEM5.\",\n      \"method\": \"Direct binding assay (pulldown), co-localization by immunostaining in embryonic tissue sections\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct pulldown and co-localization reported, single lab, two methods but no reciprocal Co-IP or mutagenesis validation\",\n      \"pmids\": [\"15021905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TEM5 (ADGRA2) expression in endothelial cells is induced during capillary morphogenesis by the small GTPase Rac (not Rho), as shown by pharmacological inhibitor dissection. TEM5 mediates contact inhibition of endothelial cell proliferation: blockade with a soluble extracellular domain or inhibitory antibody abolished contact inhibition, resulting in multilayered islands and increased vessel density.\",\n      \"method\": \"Matrigel and 3D collagen capillary formation assays, GTPase inhibitors (toxin B, C3 transferase, NSC23766), inhibitory antibody and soluble domain competition, proliferation assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — pharmacological pathway dissection and functional antibody blockade, single lab, multiple methods\",\n      \"pmids\": [\"19853600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Thrombin directly cleaves TEM5 (ADGRA2) 5 and 34 residues downstream of its RGD motif, generating a shed N-terminal 60 kDa fragment (N60) containing an open RGD conformation. Cell-surface protein disulfide-isomerase (PDI) is required for this shedding: PDI inhibition abrogated N60 release, while addition of reduced PDI enhanced cleavage and dissociation of the N60–C50 disulfide-linked heterodimer.\",\n      \"method\": \"In vitro thrombin cleavage of recombinant soluble TEM5, cell-based shedding assay with PDI inhibitor/activator, disulfide bond analysis by immunoprecipitation\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution of protease cleavage, cell-based validation, enzymatic mechanism identified with inhibitor/activator experiments, single lab\",\n      \"pmids\": [\"22013897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GPR124 (ADGRA2) promotes cell adhesion and activates Rac and Cdc42 GTPases. It forms direct complexes with the Rho-GEFs Elmo/Dock and intersectin-1 (ITSN1), and Gβγ interacts with the C-terminal tail of GPR124 to promote GPR124–Elmo complex formation. GPR124 activates the Elmo–Dock complex as measured by Elmo phosphorylation on a conserved C-terminal tyrosine. Small fragments of Elmo or ITSN1 that bind GPR124 block GPR124-induced cell adhesion. Endogenous phospho-Elmo and ITSN1 co-localize with GPR124 at lamellipodia of adhering endothelial cells where GPR124 contributes to polarity during wound healing.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins, ectopic expression studies, GTPase activation assays (Rac/Cdc42), dominant-negative fragment competition, phosphorylation assay, immunofluorescence co-localization, wound-healing assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP of endogenous proteins, multiple functional assays, GTPase activation, dominant-negative validation, localization with functional consequence; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"28600358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"WNT7B-mediated synergistic β-catenin signaling requires GPR124 (ADGRA2) together with FZD5, FZD8, LRP6, and RECK as co-receptors. Synergistic signaling occurs downstream of β-catenin stabilization and correlates with increased lysine acetylation of β-catenin.\",\n      \"method\": \"Luciferase β-catenin reporter assays, receptor requirement tested by siRNA knockdown and dominant-negative constructs, co-expression studies in multiple cell types, β-catenin acetylation biochemistry\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reporter assays and knockdown in multiple cell types, single lab; downstream signaling mechanism partially characterized\",\n      \"pmids\": [\"28289266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The LRR (leucine-rich repeat) domain of Adgra2 (GPR124) is required for proper receptor trafficking to the plasma membrane; loss of a single LRR unit causes receptor mis-trafficking and functional loss. Adgra2 trafficking to the plasma membrane occurs independently of Reck, and Reck reaches the plasma membrane independently of Adgra2, indicating the two partners traffic separately and meet at the cell surface.\",\n      \"method\": \"Characterization of ENU-induced ouchless zebrafish splice allele, CRISPR/Cas9-engineered cell lines, subcellular localization assays, genetic complementation of adgra2 mutants\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO cells and zebrafish genetic allele with direct localization readout; single lab, two orthogonal systems\",\n      \"pmids\": [\"27979830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"An ENU-induced splice site mutation in adgra2 (gpr124), not in sorbs3 as previously attributed, underlies the ouchless zebrafish phenotype, which includes dorsal root ganglia formation defects and highly penetrant cerebrovascular defects. The aberrant transcript encodes a receptor missing one LRR unit.\",\n      \"method\": \"Genetic complementation test with characterized adgra2 mutants, RT-PCR splice analysis, sequencing of ouchless allele\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic complementation and molecular characterization; single lab, clear allelic assignment\",\n      \"pmids\": [\"27979884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GPR124 (ADGRA2) is required for VEGF-induced tumor angiogenesis: siRNA silencing of GPR124 in human endothelial cells inhibited xenograft tumor angiogenic vessel formation, tumor growth, and VEGF-induced endothelial processes including cell–cell interaction, permeability, migration, invasion, and tube formation in vitro.\",\n      \"method\": \"siRNA knockdown in human endothelial cells, xenograft tumor model, in vitro angiogenesis assays (migration, invasion, tube formation, permeability)\",\n      \"journal\": \"Current molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — loss-of-function in vitro and in vivo, multiple functional readouts; single lab\",\n      \"pmids\": [\"24730523\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ADGRA2 (GPR124/TEM5) is an adhesion GPCR expressed on endothelial cells that acts as an obligate endothelial-cell-autonomous co-receptor (with RECK) for WNT7A/7B-driven canonical Wnt/β-catenin signaling, driving CNS-specific angiogenesis and blood-brain barrier formation; it promotes cell adhesion and cytoskeletal remodeling by coupling Gβγ to a Elmo–Dock/intersectin-1 Rho-GEF complex activating Rac and Cdc42, mediates contact inhibition of endothelial proliferation in a Rac-dependent manner, is shed proteolytically by MMP-9 and thrombin (the latter regulated by cell-surface PDI) to expose a cryptic RGD motif that engages integrin αvβ3 for endothelial survival, and traffics to the plasma membrane via its LRR domain independently of its co-receptor RECK where it is scaffolded by hDlg through a C-terminal PDZ-binding motif.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ADGRA2 (GPR124/TEM5) is an endothelial adhesion GPCR that functions as a cell-autonomous regulator of CNS-specific angiogenesis and blood-brain barrier formation, as established by global and endothelial-specific knockout mice that die embryonically with defective forebrain and spinal cord vascularization, failed vessel invasion of the neuroepithelium, and loss of barrier markers including Glut-1 [#0]. Its CNS angiogenic role is mediated through canonical Wnt signaling: ADGRA2 acts as a co-receptor that, together with FZD5, FZD8, LRP6, and RECK, drives WNT7B-mediated synergistic \\u03b2-catenin signaling downstream of \\u03b2-catenin stabilization, correlating with increased \\u03b2-catenin acetylation [#6]. ADGRA2 and RECK traffic to the plasma membrane independently and meet at the cell surface, with the leucine-rich repeat domain required for correct receptor trafficking [#7, #8]. At the membrane, ADGRA2 promotes adhesion and cytoskeletal remodeling by coupling G\\u03b2\\u03b3 to a Rho-GEF module: it forms direct complexes with Elmo/Dock and intersectin-1, activates Rac and Cdc42, and concentrates with phospho-Elmo and ITSN1 at lamellipodia to direct polarity during migration [#5]. ADGRA2 also mediates Rac-dependent contact inhibition of endothelial proliferation [#3] and is required for VEGF-induced tumor angiogenesis [#9]. The receptor is proteolytically shed by MMP-9 and by thrombin\\u2014the latter requiring cell-surface protein disulfide-isomerase\\u2014to expose a cryptic RGD motif that engages integrin \\u03b1v\\u03b23 and supports survival of growth-factor-deprived endothelial cells [#1, #4]. Its C-terminal PDZ-binding motif recruits the scaffold hDlg to the membrane [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established that ADGRA2 has an intracellular scaffolding output, linking the receptor's C-terminus to a membrane-associated guanylate kinase scaffold.\",\n      \"evidence\": \"Direct pulldown of hDlg PDZ domains by the TEM5 C-terminal PDZ-binding motif plus co-localization in embryonic liver endothelium\",\n      \"pmids\": [\"15021905\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reciprocal Co-IP or mutagenesis of the PDZ motif\", \"Functional consequence of hDlg scaffolding not defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined an integrin-coupled extracellular function, showing that proteolytic shedding converts ADGRA2 into a pro-survival ligand via a cryptic RGD motif.\",\n      \"evidence\": \"In vitro capillary assays, MMP-9 shedding, recombinant binding, function-blocking \\u03b1v\\u03b23 antibody, survival assays\",\n      \"pmids\": [\"16982628\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between shed-fragment signaling and full-length receptor signaling unresolved\", \"In vivo relevance of \\u03b1v\\u03b23 engagement not demonstrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected ADGRA2 to GTPase control of endothelial growth, identifying Rac as both an inducer of its expression and an effector of its contact-inhibition function.\",\n      \"evidence\": \"Capillary morphogenesis assays with GTPase inhibitors and antibody/soluble-domain blockade, proliferation assays\",\n      \"pmids\": [\"19853600\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between receptor and Rac not yet defined at this stage\", \"Pharmacological inhibitor specificity limits conclusions\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established the cell-autonomous, organ-specific physiological role, showing ADGRA2 is essential for CNS angiogenesis and BBB formation.\",\n      \"evidence\": \"Global and endothelial-specific knockout mice with histology, immunostaining, and barrier-marker readouts\",\n      \"pmids\": [\"21421844\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the ligand or downstream signaling pathway\", \"Mechanism of CNS specificity not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Refined the shedding mechanism, identifying thrombin as a protease and cell-surface PDI as a regulator that controls RGD exposure.\",\n      \"evidence\": \"In vitro thrombin cleavage of recombinant TEM5, cell-based shedding with PDI inhibitor/activator, disulfide bond analysis\",\n      \"pmids\": [\"22013897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution of thrombin/PDI-dependent shedding unknown\", \"How PDI accesses the heterodimer disulfide not structurally resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended ADGRA2 function to pathological angiogenesis, showing it is required for VEGF-driven tumor vessel formation.\",\n      \"evidence\": \"siRNA knockdown in human endothelial cells, xenograft tumor model, in vitro angiogenesis assays\",\n      \"pmids\": [\"24730523\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between ADGRA2 and VEGF signaling not defined\", \"Single lab, knockdown-based\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Assigned the ouchless phenotype to adgra2 and showed the LRR domain governs receptor trafficking independently of RECK.\",\n      \"evidence\": \"ENU splice allele characterization, genetic complementation, CRISPR cell lines, subcellular localization assays in zebrafish and cells\",\n      \"pmids\": [\"27979830\", \"27979884\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How the LRR mediates trafficking mechanistically unknown\", \"Where/how ADGRA2 and RECK assemble at the surface not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the receptor's proximal signaling output, showing G\\u03b2\\u03b3-dependent coupling to Elmo/Dock and ITSN1 Rho-GEFs activates Rac and Cdc42 for adhesion and polarity.\",\n      \"evidence\": \"Reciprocal endogenous Co-IP, GTPase activation assays, dominant-negative fragment competition, Elmo phosphorylation, lamellipodial co-localization, wound healing\",\n      \"pmids\": [\"28600358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Activating ligand for the G\\u03b2\\u03b3 output not identified\", \"Integration with the Wnt co-receptor function unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed ADGRA2 within canonical Wnt signaling, showing it acts with FZD/LRP6/RECK as a co-receptor for WNT7B-driven \\u03b2-catenin activation.\",\n      \"evidence\": \"\\u03b2-catenin luciferase reporters, siRNA and dominant-negative receptor requirement tests, multi-cell-type co-expression, \\u03b2-catenin acetylation biochemistry\",\n      \"pmids\": [\"28289266\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional significance of \\u03b2-catenin acetylation not established\", \"How co-receptor assembly is spatially organized unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the Wnt co-receptor activity and the G\\u03b2\\u03b3/Rho-GEF adhesion output are mechanistically integrated, and what physiological agonist engages the receptor, remain open.\",\n      \"evidence\": \"No single discovery in the timeline unifies these two outputs\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of the receptor or its co-receptor complex\", \"Endogenous activating ligand for the GPCR signaling arm undefined\", \"Cross-talk between shedding, Wnt, and Rho-GEF arms unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [1, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 5, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RECK\", \"ELMO1\", \"ITSN1\", \"DLG1\", \"ITGAV\", \"ITGB3\", \"LRP6\", \"FZD8\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}