{"gene":"AGTR2","run_date":"2026-06-09T22:02:42","timeline":{"discoveries":[{"year":2002,"finding":"Loss-of-function mutations in AGTR2 (frameshift and missense) were identified in male patients with X-linked mental retardation, and AGTR2 expression was absent in a female patient with a balanced X;7 chromosomal translocation and mental retardation, establishing a role for AGTR2 in brain development and cognitive function.","method":"Mutation screening of 590 unrelated male MR patients; identification of absent expression in chromosomal translocation patient","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple independent mutations identified across large cohort, replicated by subsequent studies (PMIDs 14598163, 22269148)","pmids":["12089445"],"is_preprint":false},{"year":2003,"finding":"Two additional AGTR2 missense mutations (G21V and I53F) were identified in male patients with severe/profound mental retardation, epilepsy, and speech development disturbances, further confirming AGTR2's role in cognitive/neurological function.","method":"Mutation screening of AGTR2 coding region in 57 Finnish male MR patients","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — replicates prior finding with new mutations in independent cohort, single method","pmids":["14598163"],"is_preprint":false},{"year":2012,"finding":"A novel AGTR2 missense mutation (c.572G>A, p.G191E) was identified in a patient with severe mental retardation, pervasive developmental disorder, and epilepsy, further confirming pathogenic mutations in AGTR2 cause neurodevelopmental disorder.","method":"Genetic sequencing/mutation identification in patient","journal":"Brain & development","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single case report, single method, no functional characterization of mutation","pmids":["22269148"],"is_preprint":false},{"year":2009,"finding":"Agtr2 knockout mice (Agtr2-/y) showed significant impairment in spatial memory and abnormal dendritic spine morphology; genome-wide expression profiling of Agtr2-/y brains identified differentially expressed genes involved in microtubule functions associated with dendritic spine morphology, placing AGTR2 in a pathway regulating spine structure and cognitive function.","method":"Agtr2 knockout mouse model; behavioral testing; whole-genome microarray expression profiling; quantitative RT-PCR validation","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined KO phenotype with multiple orthogonal methods (behavior, microarray, qPCR), single lab","pmids":["19501643"],"is_preprint":false},{"year":2018,"finding":"AGTR2 forms heterodimers with TRKB (co-immunoprecipitation in MG87 cells with GFP-tagged AGTR2); angiotensin II acting through AGTR2 increased surface levels of TRKB and its coupling to FYN (a SRC family kinase) in cultured cortical cells, indicating AGTR2 can transactivate TRKB via FYN recruitment.","method":"Co-immunoprecipitation of GFP-AGTR2 with TRKB in MG87 cells; surface TRKB quantification in rat embryonic cortical cells; pharmacological antagonism with PD123319","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus functional surface receptor assay, single lab, two orthogonal methods","pmids":["29550391"],"is_preprint":false},{"year":2018,"finding":"Genetic deletion of AGTR2 or pharmacologic antagonism with PD123319 normalized pulmonary function in two independent CF mouse models, establishing that AGTR2 signaling contributes to cystic fibrosis pulmonary disease pathogenesis.","method":"AGTR2 knockout mice crossed with CF mouse models; subcutaneous PD123319 treatment for 12 weeks; pulmonary function measurements","journal":"Journal of cystic fibrosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent CF mouse models with both genetic and pharmacologic intervention, single lab","pmids":["29937318"],"is_preprint":false},{"year":2007,"finding":"Over-expression of AGTR2 (via AAV/AT2R) in LDLR-knockout mice reduced atherogenesis by ~50%, suppressed NADPH oxidase, nitrotyrosine and NF-κB expression, restored eNOS and HO-1 expression, reduced LOX-1 upregulation, and restored Akt-1 phosphorylation, placing AGTR2 as a counter-regulatory receptor opposing AT1R-driven oxidative/inflammatory pathways.","method":"AAV-mediated AGTR2 overexpression in LDLR-KO mice on high-cholesterol diet; aortic tissue analysis by immunohistochemistry and Western blot","journal":"Atherosclerosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain-of-function with multiple downstream readouts, single lab","pmids":["18096165"],"is_preprint":false},{"year":2007,"finding":"AGTR2 over-expression in LDLR-knockout atherosclerotic mice reduced collagen accumulation by ~50% and blocked alterations in procollagen-I, osteopontin, fibronectin, CD68, MMP-2 and MMP-9 expression, and p38/p44/42 MAPK phosphorylation, while restoring superoxide dismutase activity.","method":"AAV-mediated AGTR2 overexpression in LDLR-KO mice; Western blot, collagen staining, enzyme activity assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain-of-function with multiple molecular readouts, single lab","pmids":["18037370"],"is_preprint":false},{"year":2015,"finding":"Maternal high-fat diet caused increased AGTR2 (but not AGTR1) mRNA and protein expression specifically in male rat offspring hearts, associated with decreased glucocorticoid receptor binding to the Agtr2 promoter glucocorticoid response elements; pharmacologic inhibition of AGTR2 with PD123319 abrogated the maternal HFD-induced increase in cardiac ischemic vulnerability, establishing AGTR2 as a mediator of developmental programming of cardiac ischemic susceptibility.","method":"Maternal HFD rat model; qRT-PCR and Western blot for Agtr2; chromatin immunoprecipitation (GR binding to Agtr2 promoter); PD123319 treatment with ischemia-reperfusion injury assay","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP, pharmacologic rescue, protein/mRNA), single lab","pmids":["26157067"],"is_preprint":false},{"year":1995,"finding":"The mouse Agtr2 gene was mapped to the proximal X chromosome (between DXMit85 and DXMit49) by linkage analysis, and human AGTR2 was mapped to Xq22 by fluorescence in situ hybridization, establishing the chromosomal localization of both orthologous genes.","method":"Interspecific backcross linkage analysis (mouse); fluorescence in situ hybridization (human)","journal":"Genomics / Cytogenetics and cell genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct chromosomal mapping by two independent methods replicated across two papers","pmids":["8586443","7606933"],"is_preprint":false},{"year":2023,"finding":"A non-coding variant near AGTR2 (rs7889204) acts as a strong eQTL reducing AGTR2 expression in uterine tissue; reporter assays demonstrated decreased enhancer activity for the risk C allele, and allele-dependent differential binding of transcription factors CEBPB and HOXA10 was identified, establishing a functional mechanism by which reduced AGTR2 expression in uterus increases preterm birth risk.","method":"Reporter/enhancer assays; allele-specific transcription factor binding assays; eQTL analysis of GTEx uterine tissue data","journal":"BMC medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter assay plus TF binding characterization, single lab, two orthogonal methods","pmids":["37455310"],"is_preprint":false},{"year":2014,"finding":"Treatment with AGTR2 agonist CGP42112A reduced angiotensin II-mediated cell survival in ovarian cancer cells and HUVEC, and combined treatment with AGTR1 antagonist losartan synergistically decreased cell survival and reduced phosphorylation of PLCβ3 and VEGF expression.","method":"Cell viability assays; Western blot for PLCβ3 phosphorylation and VEGF in ovarian cancer cell lines and HUVEC","journal":"Gynecologic oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacologic gain-of-function only, single lab, no genetic confirmation of AGTR2 specificity","pmids":["25014541"],"is_preprint":false},{"year":2025,"finding":"Molecular dynamics simulations revealed that angiotensin II stabilizes the active state of AGTR2 by reducing fluctuations in TM6 and Helix8, while angiotensin 1-7 modulates the inactive state by enhancing flexibility in intracellular loops and Helix8; key interactions identified include hydrogen bonds (PHE8-LYS215 for Ang II), salt bridges (ARG2-ASP279/ASP297), and conserved micro-switch motifs (CWxP, PIF, E/DRY, NPxxY).","method":"Long-timescale molecular dynamics simulation; dynamic residue interaction network analysis","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational simulation only, no experimental validation, preprint","pmids":["bio_10.1101_2025.01.22.634339"],"is_preprint":true}],"current_model":"AGTR2 is an X-linked G-protein-coupled receptor for angiotensin II that opposes AT1R (AGTR1) signaling; loss-of-function mutations cause X-linked intellectual disability associated with abnormal dendritic spine morphology, while in cardiovascular tissues AGTR2 activation suppresses oxidative stress, NF-κB/MAPK signaling, collagen accumulation, and atherogenesis via Akt-1 and eNOS/HO-1 pathways; in the brain AGTR2 forms heterodimers with TRKB and recruits FYN kinase to mediate TRKB transactivation; glucocorticoid receptor binding to the Agtr2 promoter regulates its cardiac expression; and reduced AGTR2 expression in the uterus, driven by allele-specific binding of CEBPB/HOXA10 to a regulatory enhancer, increases preterm birth risk."},"narrative":{"mechanistic_narrative":"AGTR2 is an X-linked G-protein-coupled receptor for angiotensin II that functions in both neurodevelopment and cardiovascular homeostasis, broadly acting as a counter-regulatory receptor that opposes AT1R (AGTR1)-driven oxidative and inflammatory signaling [PMID:12089445, PMID:18096165]. In the brain, loss-of-function frameshift and missense mutations in AGTR2 cause X-linked intellectual disability, and Agtr2-knockout mice display impaired spatial memory together with abnormal dendritic spine morphology linked to dysregulation of microtubule-associated genes, establishing AGTR2 in a pathway controlling spine structure and cognition [PMID:12089445, PMID:14598163, PMID:19501643]. Mechanistically in neurons, AGTR2 forms heterodimers with the neurotrophin receptor TRKB and, upon angiotensin II stimulation, increases surface TRKB and its coupling to the SRC-family kinase FYN, transactivating TRKB signaling [PMID:29550391]. In cardiovascular tissue, AGTR2 overexpression suppresses atherogenesis, NADPH oxidase, nitrotyrosine, NF-κB and p38/p44/42 MAPK signaling and collagen accumulation while restoring eNOS, HO-1, Akt-1 phosphorylation and superoxide dismutase activity [PMID:18096165, PMID:18037370]. Cardiac Agtr2 expression is regulated by glucocorticoid receptor binding to glucocorticoid response elements in its promoter, a mechanism through which maternal high-fat diet programs cardiac ischemic vulnerability [PMID:26157067], and a non-coding enhancer variant that reduces AGTR2 expression in uterus via allele-specific CEBPB/HOXA10 binding increases preterm birth risk [PMID:37455310].","teleology":[{"year":1995,"claim":"Establishing the chromosomal location of AGTR2 was the prerequisite for connecting the gene to X-linked phenotypes.","evidence":"Interspecific backcross linkage mapping in mouse and FISH in human","pmids":["8586443","7606933"],"confidence":"High","gaps":["Mapping alone does not assign function","No link to disease established at this stage"]},{"year":2002,"claim":"Identifying loss-of-function mutations and absent expression in patients answered whether AGTR2 is required for normal cognition, linking the receptor to brain development.","evidence":"Mutation screening of 590 male MR patients and an X;7 translocation case","pmids":["12089445"],"confidence":"High","gaps":["Did not define the cellular mechanism of cognitive impairment","No functional assay of mutant receptors"]},{"year":2003,"claim":"Additional independent missense mutations confirmed the AGTR2-intellectual disability association in a separate cohort.","evidence":"Mutation screening of 57 Finnish male MR patients","pmids":["14598163"],"confidence":"Medium","gaps":["No functional characterization of G21V/I53F","Single screening method"]},{"year":2007,"claim":"Gain-of-function overexpression in atherosclerotic mice answered what protective cardiovascular role AGTR2 plays, defining it as a counter-regulatory receptor opposing AT1R-driven oxidative, inflammatory and fibrotic signaling.","evidence":"AAV-mediated AGTR2 overexpression in LDLR-KO mice with IHC, Western blot, collagen and enzyme assays","pmids":["18096165","18037370"],"confidence":"Medium","gaps":["Overexpression may not reflect endogenous receptor levels","Direct G-protein coupling not resolved","Single lab"]},{"year":2009,"claim":"A knockout model linked AGTR2 loss to a concrete neuronal phenotype, showing impaired spatial memory and abnormal dendritic spines tied to microtubule-related gene expression.","evidence":"Agtr2-/y mice with behavioral testing, microarray and qRT-PCR","pmids":["19501643"],"confidence":"Medium","gaps":["Causal chain from receptor to spine morphology unresolved","Microtubule genes correlative, not validated targets","Single lab"]},{"year":2015,"claim":"ChIP and pharmacologic rescue revealed how AGTR2 cardiac expression is transcriptionally controlled and how it mediates developmental programming of ischemic vulnerability.","evidence":"Maternal HFD rat model with ChIP of GR on the Agtr2 promoter, expression assays and PD123319 ischemia-reperfusion rescue","pmids":["26157067"],"confidence":"Medium","gaps":["Mechanism downstream of AGTR2 in ischemia not defined","Sex-specificity mechanism unexplained","Single lab"]},{"year":2018,"claim":"Co-IP and surface receptor assays answered how AGTR2 signals in neurons, demonstrating heterodimerization with TRKB and FYN-mediated transactivation.","evidence":"Co-IP of GFP-AGTR2 with TRKB in MG87 cells, surface TRKB quantification in cortical cells, PD123319 antagonism","pmids":["29550391"],"confidence":"Medium","gaps":["Stoichiometry of the heterodimer unknown","Link between TRKB transactivation and spine phenotype untested","Single lab"]},{"year":2018,"claim":"Genetic and pharmacologic loss-of-function established a pathogenic role for AGTR2 signaling in cystic fibrosis pulmonary disease.","evidence":"AGTR2-KO crossed with two CF mouse models plus chronic PD123319, with pulmonary function readouts","pmids":["29937318"],"confidence":"Medium","gaps":["Downstream mediators in lung not defined","Cell type responsible unidentified"]},{"year":2023,"claim":"Functional dissection of a non-coding variant answered how AGTR2 expression is regulated in uterus and links reduced expression to preterm birth.","evidence":"Reporter/enhancer assays, allele-specific CEBPB/HOXA10 binding and GTEx uterine eQTL analysis","pmids":["37455310"],"confidence":"Medium","gaps":["Causal pathway from uterine AGTR2 to parturition not established","TF binding not validated in vivo"]},{"year":null,"claim":"The structural basis and full downstream signaling network of AGTR2 across its neuronal and cardiovascular roles remain incompletely defined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No experimental structure of agonist-bound AGTR2","Mechanism connecting TRKB transactivation to dendritic spine and cognition unproven","G-protein/effector coupling not directly mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,6]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,3]}],"complexes":[],"partners":["TRKB","FYN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P50052","full_name":"Type-2 angiotensin II receptor","aliases":["Angiotensin II type-2 receptor","AT2 receptor"],"length_aa":363,"mass_kda":41.2,"function":"Receptor for angiotensin II, a vasoconstricting peptide (PubMed:28379944, PubMed:29967536, PubMed:31899086, PubMed:8185599). Signals primarily via a non-canonical G-protein- and beta-arrestin independent pathways (PubMed:28379944). Cooperates with MTUS1 to inhibit ERK2 activation and cell proliferation (PubMed:15123706)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P50052/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AGTR2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AGTR2","total_profiled":1310},"omim":[{"mim_id":"610446","title":"BURULI ULCER, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/610446"},{"mim_id":"609589","title":"MICROTUBULE-ASSOCIATED SCAFFOLD PROTEIN 1; MTUS1","url":"https://www.omim.org/entry/609589"},{"mim_id":"300852","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, X-LINKED 88; XLID88","url":"https://www.omim.org/entry/300852"},{"mim_id":"300447","title":"RHOX HOMEOBOX FAMILY, MEMBER 2; RHOXF2","url":"https://www.omim.org/entry/300447"},{"mim_id":"300446","title":"RHOX HOMEOBOX FAMILY, MEMBER 1; RHOXF1","url":"https://www.omim.org/entry/300446"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"endometrium 1","ntpm":8.2},{"tissue":"lung","ntpm":8.3},{"tissue":"smooth muscle","ntpm":12.3}],"url":"https://www.proteinatlas.org/search/AGTR2"},"hgnc":{"alias_symbol":["AT2","MRX88"],"prev_symbol":[]},"alphafold":{"accession":"P50052","domains":[{"cath_id":"1.20.1070.10","chopping":"39-321","consensus_level":"high","plddt":91.3248,"start":39,"end":321}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P50052","model_url":"https://alphafold.ebi.ac.uk/files/AF-P50052-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P50052-F1-predicted_aligned_error_v6.png","plddt_mean":82.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AGTR2","jax_strain_url":"https://www.jax.org/strain/search?query=AGTR2"},"sequence":{"accession":"P50052","fasta_url":"https://rest.uniprot.org/uniprotkb/P50052.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P50052/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P50052"}},"corpus_meta":[{"pmid":"12089445","id":"PMC_12089445","title":"AGTR2 mutations in X-linked mental 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mutation","url":"https://pubmed.ncbi.nlm.nih.gov/42006151","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.01.22.634339","title":"Ligand Binding Effects on Activation of Type-2 Angiotensin II Receptor","date":"2025-01-25","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.22.634339","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.06.17.599425","title":"Convergence of Angiotensin Signaling on Lung Pericyte and Stromal Behaviors","date":"2024-06-22","source":"bioRxiv","url":"https://doi.org/10.1101/2024.06.17.599425","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.26.605349","title":"Proliferative arrest induces neuronal differentiation and innate immune responses in normal and Creutzfeldt-Jakob Disease agent (CJ) infected rat septal 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identified in male patients with X-linked mental retardation, and AGTR2 expression was absent in a female patient with a balanced X;7 chromosomal translocation and mental retardation, establishing a role for AGTR2 in brain development and cognitive function.\",\n      \"method\": \"Mutation screening of 590 unrelated male MR patients; identification of absent expression in chromosomal translocation patient\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple independent mutations identified across large cohort, replicated by subsequent studies (PMIDs 14598163, 22269148)\",\n      \"pmids\": [\"12089445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Two additional AGTR2 missense mutations (G21V and I53F) were identified in male patients with severe/profound mental retardation, epilepsy, and speech development disturbances, further confirming AGTR2's role in cognitive/neurological function.\",\n      \"method\": \"Mutation screening of AGTR2 coding region in 57 Finnish male MR patients\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — replicates prior finding with new mutations in independent cohort, single method\",\n      \"pmids\": [\"14598163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A novel AGTR2 missense mutation (c.572G>A, p.G191E) was identified in a patient with severe mental retardation, pervasive developmental disorder, and epilepsy, further confirming pathogenic mutations in AGTR2 cause neurodevelopmental disorder.\",\n      \"method\": \"Genetic sequencing/mutation identification in patient\",\n      \"journal\": \"Brain & development\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single case report, single method, no functional characterization of mutation\",\n      \"pmids\": [\"22269148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Agtr2 knockout mice (Agtr2-/y) showed significant impairment in spatial memory and abnormal dendritic spine morphology; genome-wide expression profiling of Agtr2-/y brains identified differentially expressed genes involved in microtubule functions associated with dendritic spine morphology, placing AGTR2 in a pathway regulating spine structure and cognitive function.\",\n      \"method\": \"Agtr2 knockout mouse model; behavioral testing; whole-genome microarray expression profiling; quantitative RT-PCR validation\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined KO phenotype with multiple orthogonal methods (behavior, microarray, qPCR), single lab\",\n      \"pmids\": [\"19501643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"AGTR2 forms heterodimers with TRKB (co-immunoprecipitation in MG87 cells with GFP-tagged AGTR2); angiotensin II acting through AGTR2 increased surface levels of TRKB and its coupling to FYN (a SRC family kinase) in cultured cortical cells, indicating AGTR2 can transactivate TRKB via FYN recruitment.\",\n      \"method\": \"Co-immunoprecipitation of GFP-AGTR2 with TRKB in MG87 cells; surface TRKB quantification in rat embryonic cortical cells; pharmacological antagonism with PD123319\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus functional surface receptor assay, single lab, two orthogonal methods\",\n      \"pmids\": [\"29550391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Genetic deletion of AGTR2 or pharmacologic antagonism with PD123319 normalized pulmonary function in two independent CF mouse models, establishing that AGTR2 signaling contributes to cystic fibrosis pulmonary disease pathogenesis.\",\n      \"method\": \"AGTR2 knockout mice crossed with CF mouse models; subcutaneous PD123319 treatment for 12 weeks; pulmonary function measurements\",\n      \"journal\": \"Journal of cystic fibrosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent CF mouse models with both genetic and pharmacologic intervention, single lab\",\n      \"pmids\": [\"29937318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Over-expression of AGTR2 (via AAV/AT2R) in LDLR-knockout mice reduced atherogenesis by ~50%, suppressed NADPH oxidase, nitrotyrosine and NF-κB expression, restored eNOS and HO-1 expression, reduced LOX-1 upregulation, and restored Akt-1 phosphorylation, placing AGTR2 as a counter-regulatory receptor opposing AT1R-driven oxidative/inflammatory pathways.\",\n      \"method\": \"AAV-mediated AGTR2 overexpression in LDLR-KO mice on high-cholesterol diet; aortic tissue analysis by immunohistochemistry and Western blot\",\n      \"journal\": \"Atherosclerosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain-of-function with multiple downstream readouts, single lab\",\n      \"pmids\": [\"18096165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"AGTR2 over-expression in LDLR-knockout atherosclerotic mice reduced collagen accumulation by ~50% and blocked alterations in procollagen-I, osteopontin, fibronectin, CD68, MMP-2 and MMP-9 expression, and p38/p44/42 MAPK phosphorylation, while restoring superoxide dismutase activity.\",\n      \"method\": \"AAV-mediated AGTR2 overexpression in LDLR-KO mice; Western blot, collagen staining, enzyme activity assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain-of-function with multiple molecular readouts, single lab\",\n      \"pmids\": [\"18037370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Maternal high-fat diet caused increased AGTR2 (but not AGTR1) mRNA and protein expression specifically in male rat offspring hearts, associated with decreased glucocorticoid receptor binding to the Agtr2 promoter glucocorticoid response elements; pharmacologic inhibition of AGTR2 with PD123319 abrogated the maternal HFD-induced increase in cardiac ischemic vulnerability, establishing AGTR2 as a mediator of developmental programming of cardiac ischemic susceptibility.\",\n      \"method\": \"Maternal HFD rat model; qRT-PCR and Western blot for Agtr2; chromatin immunoprecipitation (GR binding to Agtr2 promoter); PD123319 treatment with ischemia-reperfusion injury assay\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP, pharmacologic rescue, protein/mRNA), single lab\",\n      \"pmids\": [\"26157067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The mouse Agtr2 gene was mapped to the proximal X chromosome (between DXMit85 and DXMit49) by linkage analysis, and human AGTR2 was mapped to Xq22 by fluorescence in situ hybridization, establishing the chromosomal localization of both orthologous genes.\",\n      \"method\": \"Interspecific backcross linkage analysis (mouse); fluorescence in situ hybridization (human)\",\n      \"journal\": \"Genomics / Cytogenetics and cell genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct chromosomal mapping by two independent methods replicated across two papers\",\n      \"pmids\": [\"8586443\", \"7606933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A non-coding variant near AGTR2 (rs7889204) acts as a strong eQTL reducing AGTR2 expression in uterine tissue; reporter assays demonstrated decreased enhancer activity for the risk C allele, and allele-dependent differential binding of transcription factors CEBPB and HOXA10 was identified, establishing a functional mechanism by which reduced AGTR2 expression in uterus increases preterm birth risk.\",\n      \"method\": \"Reporter/enhancer assays; allele-specific transcription factor binding assays; eQTL analysis of GTEx uterine tissue data\",\n      \"journal\": \"BMC medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter assay plus TF binding characterization, single lab, two orthogonal methods\",\n      \"pmids\": [\"37455310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Treatment with AGTR2 agonist CGP42112A reduced angiotensin II-mediated cell survival in ovarian cancer cells and HUVEC, and combined treatment with AGTR1 antagonist losartan synergistically decreased cell survival and reduced phosphorylation of PLCβ3 and VEGF expression.\",\n      \"method\": \"Cell viability assays; Western blot for PLCβ3 phosphorylation and VEGF in ovarian cancer cell lines and HUVEC\",\n      \"journal\": \"Gynecologic oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacologic gain-of-function only, single lab, no genetic confirmation of AGTR2 specificity\",\n      \"pmids\": [\"25014541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Molecular dynamics simulations revealed that angiotensin II stabilizes the active state of AGTR2 by reducing fluctuations in TM6 and Helix8, while angiotensin 1-7 modulates the inactive state by enhancing flexibility in intracellular loops and Helix8; key interactions identified include hydrogen bonds (PHE8-LYS215 for Ang II), salt bridges (ARG2-ASP279/ASP297), and conserved micro-switch motifs (CWxP, PIF, E/DRY, NPxxY).\",\n      \"method\": \"Long-timescale molecular dynamics simulation; dynamic residue interaction network analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational simulation only, no experimental validation, preprint\",\n      \"pmids\": [\"bio_10.1101_2025.01.22.634339\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"AGTR2 is an X-linked G-protein-coupled receptor for angiotensin II that opposes AT1R (AGTR1) signaling; loss-of-function mutations cause X-linked intellectual disability associated with abnormal dendritic spine morphology, while in cardiovascular tissues AGTR2 activation suppresses oxidative stress, NF-κB/MAPK signaling, collagen accumulation, and atherogenesis via Akt-1 and eNOS/HO-1 pathways; in the brain AGTR2 forms heterodimers with TRKB and recruits FYN kinase to mediate TRKB transactivation; glucocorticoid receptor binding to the Agtr2 promoter regulates its cardiac expression; and reduced AGTR2 expression in the uterus, driven by allele-specific binding of CEBPB/HOXA10 to a regulatory enhancer, increases preterm birth risk.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AGTR2 is an X-linked G-protein-coupled receptor for angiotensin II that functions in both neurodevelopment and cardiovascular homeostasis, broadly acting as a counter-regulatory receptor that opposes AT1R (AGTR1)-driven oxidative and inflammatory signaling [#0, #6]. In the brain, loss-of-function frameshift and missense mutations in AGTR2 cause X-linked intellectual disability, and Agtr2-knockout mice display impaired spatial memory together with abnormal dendritic spine morphology linked to dysregulation of microtubule-associated genes, establishing AGTR2 in a pathway controlling spine structure and cognition [#0, #1, #3]. Mechanistically in neurons, AGTR2 forms heterodimers with the neurotrophin receptor TRKB and, upon angiotensin II stimulation, increases surface TRKB and its coupling to the SRC-family kinase FYN, transactivating TRKB signaling [#4]. In cardiovascular tissue, AGTR2 overexpression suppresses atherogenesis, NADPH oxidase, nitrotyrosine, NF-\\u03baB and p38/p44/42 MAPK signaling and collagen accumulation while restoring eNOS, HO-1, Akt-1 phosphorylation and superoxide dismutase activity [#6, #7]. Cardiac Agtr2 expression is regulated by glucocorticoid receptor binding to glucocorticoid response elements in its promoter, a mechanism through which maternal high-fat diet programs cardiac ischemic vulnerability [#8], and a non-coding enhancer variant that reduces AGTR2 expression in uterus via allele-specific CEBPB/HOXA10 binding increases preterm birth risk [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing the chromosomal location of AGTR2 was the prerequisite for connecting the gene to X-linked phenotypes.\",\n      \"evidence\": \"Interspecific backcross linkage mapping in mouse and FISH in human\",\n      \"pmids\": [\"8586443\", \"7606933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mapping alone does not assign function\", \"No link to disease established at this stage\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identifying loss-of-function mutations and absent expression in patients answered whether AGTR2 is required for normal cognition, linking the receptor to brain development.\",\n      \"evidence\": \"Mutation screening of 590 male MR patients and an X;7 translocation case\",\n      \"pmids\": [\"12089445\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the cellular mechanism of cognitive impairment\", \"No functional assay of mutant receptors\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Additional independent missense mutations confirmed the AGTR2-intellectual disability association in a separate cohort.\",\n      \"evidence\": \"Mutation screening of 57 Finnish male MR patients\",\n      \"pmids\": [\"14598163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional characterization of G21V/I53F\", \"Single screening method\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Gain-of-function overexpression in atherosclerotic mice answered what protective cardiovascular role AGTR2 plays, defining it as a counter-regulatory receptor opposing AT1R-driven oxidative, inflammatory and fibrotic signaling.\",\n      \"evidence\": \"AAV-mediated AGTR2 overexpression in LDLR-KO mice with IHC, Western blot, collagen and enzyme assays\",\n      \"pmids\": [\"18096165\", \"18037370\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression may not reflect endogenous receptor levels\", \"Direct G-protein coupling not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"A knockout model linked AGTR2 loss to a concrete neuronal phenotype, showing impaired spatial memory and abnormal dendritic spines tied to microtubule-related gene expression.\",\n      \"evidence\": \"Agtr2-/y mice with behavioral testing, microarray and qRT-PCR\",\n      \"pmids\": [\"19501643\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from receptor to spine morphology unresolved\", \"Microtubule genes correlative, not validated targets\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"ChIP and pharmacologic rescue revealed how AGTR2 cardiac expression is transcriptionally controlled and how it mediates developmental programming of ischemic vulnerability.\",\n      \"evidence\": \"Maternal HFD rat model with ChIP of GR on the Agtr2 promoter, expression assays and PD123319 ischemia-reperfusion rescue\",\n      \"pmids\": [\"26157067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism downstream of AGTR2 in ischemia not defined\", \"Sex-specificity mechanism unexplained\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Co-IP and surface receptor assays answered how AGTR2 signals in neurons, demonstrating heterodimerization with TRKB and FYN-mediated transactivation.\",\n      \"evidence\": \"Co-IP of GFP-AGTR2 with TRKB in MG87 cells, surface TRKB quantification in cortical cells, PD123319 antagonism\",\n      \"pmids\": [\"29550391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry of the heterodimer unknown\", \"Link between TRKB transactivation and spine phenotype untested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Genetic and pharmacologic loss-of-function established a pathogenic role for AGTR2 signaling in cystic fibrosis pulmonary disease.\",\n      \"evidence\": \"AGTR2-KO crossed with two CF mouse models plus chronic PD123319, with pulmonary function readouts\",\n      \"pmids\": [\"29937318\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream mediators in lung not defined\", \"Cell type responsible unidentified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Functional dissection of a non-coding variant answered how AGTR2 expression is regulated in uterus and links reduced expression to preterm birth.\",\n      \"evidence\": \"Reporter/enhancer assays, allele-specific CEBPB/HOXA10 binding and GTEx uterine eQTL analysis\",\n      \"pmids\": [\"37455310\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal pathway from uterine AGTR2 to parturition not established\", \"TF binding not validated in vivo\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis and full downstream signaling network of AGTR2 across its neuronal and cardiovascular roles remain incompletely defined.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No experimental structure of agonist-bound AGTR2\", \"Mechanism connecting TRKB transactivation to dendritic spine and cognition unproven\", \"G-protein/effector coupling not directly mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TRKB\", \"FYN\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}