{"gene":"OXTR","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2009,"finding":"OTR is expressed in enteric neurons (including intrinsic primary afferent neurons identified by NeuN co-localization) and intestinal epithelium, with developmentally regulated expression peaking at postnatal day 7; OTR protein was detected at plasmalemmal enterocyte adherens junctions by immunoelectron microscopy, suggesting a role in ENS development and epithelial biology.","method":"RT-PCR, immunofluorescence co-localization, immunoelectron microscopy, developmental time-course analysis","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with ultrastructural resolution and multiple orthogonal methods in one study, but single lab without functional loss-of-function validation","pmids":["19003903"],"is_preprint":false},{"year":2012,"finding":"OXTR is overexpressed in myometrial smooth muscle cells from adenomyosis patients compared to controls; overexpression correlates with increased uterine contractile amplitude and dysmenorrhea severity; histone deacetylase inhibitor TSA and andrographolide dose-dependently inhibit OTR expression in these cells.","method":"Western blot quantification of OTR protein in primary MSMC cultures, in vitro contractility assay, pharmacological inhibition with TSA and andrographolide","journal":"Fertility and sterility","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein quantification with functional contractility readout and pharmacological manipulation, single lab","pmids":["22999795"],"is_preprint":false},{"year":2014,"finding":"Oxytocin down-regulates mesenteric afferent sensitivity through the enteric OTR/nNOS/NO/KATP pathway: OTR co-localizes with nNOS in myenteric plexus neurons; OTR-mediated attenuation of bradykinin- or distension-evoked afferent discharge is blocked by NOS inhibitors (L-NAME, NPLA), N/P-type calcium channel antagonists, and KATP blocker glibenclamide.","method":"In vitro mesenteric afferent discharge recording, immunofluorescence co-localization, pharmacological blockade with L-NAME/NPLA/glibenclamide","journal":"Neurogastroenterology and motility","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro functional assay with multiple pharmacological pathway dissections and immunofluorescence co-localization, single lab but orthogonal methods","pmids":["25346204"],"is_preprint":false},{"year":2018,"finding":"TET1 protein regulates Oxtr expression by preventing DNA hypermethylation of Oxtr CpG islands during early development; Tet1-deficient mice show reduced select Oxtr mRNA isoforms, hypermethylation of Oxtr CpG islands persisting into adulthood, impaired maternal care, impaired social behavior, and reduced synaptic responses to oxytocin stimulation.","method":"Tet1 knockout mice (exon 4 deletion), RT-PCR isoform analysis, CpG methylation analysis, behavioral assays (maternal care, social behavior), synaptic physiology","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with multiple orthogonal readouts (methylation, expression, behavior, physiology) in a single rigorous study","pmids":["30518695"],"is_preprint":false},{"year":2021,"finding":"Progesterone receptor isoform B (PGR-B) suppresses uterine contractility by reducing Oxtr and Trpc3 expression and increasing Plcl2 expression in myometrium; both PLCL1 and PLCL2 can attenuate uterine muscle cell contraction in a CRISPRa-based assay, defining an Oxtr-Plcl2-Trpc3 pathway downstream of PGR-B.","method":"Transgenic mouse models overexpressing PGR-A or PGR-B in smooth muscle, uterine RNA sequencing, ex vivo and in vivo contractility assays, CRISPRa functional assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo genetic models with RNA-seq pathway identification, ex vivo/in vivo functional assays, and CRISPRa functional validation in one study","pmids":["33707208"],"is_preprint":false},{"year":2021,"finding":"Chemogenetic activation of septal neurons expressing OXTr induces anxiety-like but not depressive-like behavior; septal OXTr neurons express vGAT (vesicular GABA transporter) and project inhibitory GABAergic fibers to the horizontal diagonal band of Broca (HDB); optogenetic stimulation of septal OXTr→HDB projections inactivates HDB neurons and elicits anxiety-like behavior.","method":"Chemogenetics (DREADD), optogenetics, immunofluorescence for vGAT, behavioral anxiety assays, circuit tracing","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (chemogenetics, optogenetics, circuit anatomy) with defined cellular and behavioral phenotype in single study","pmids":["34489531"],"is_preprint":false},{"year":2022,"finding":"OXTRHigh cancer-associated fibroblasts (CAFs) promote invasion of oral squamous cell carcinoma via ERK5 nuclear transcription signaling: OXTR activates nuclear ERK5 via Gαq and CDC37 to maintain high levels of OXTR and CCL26; CCL26 is required for the invasive phenotype of CCR3+ tumors; ERK5 ablation reprograms the pro-invasive phenotype of OXTRHigh CAFs.","method":"CAF characterization, gene expression analysis, signaling pathway dissection (Gαq/CDC37/ERK5), CCL26 functional requirement, ERK5 ablation experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway dissection with loss-of-function (ERK5 ablation) and defined phenotypic readout, multiple orthogonal approaches in one rigorous study","pmids":["36045118"],"is_preprint":false},{"year":2023,"finding":"Oxytocin alleviates sepsis-associated encephalopathy cognitive/memory deficits and hippocampal synaptic dysfunction via OXTR; OXTR antagonist L-368,899 (intraperitoneal or local CA1 injection) blocks OXT-mediated neuroprotection; OXT reduces microglial phagocytosis and inflammatory cytokine release; the OXTR-ERK-STAT3 signaling pathway mediates the neuroprotective effects of OXT in SAE.","method":"CLP mouse model of SAE, intranasal OXT administration, OXTR antagonist blockade, RNA sequencing for pathway identification, in vitro LPS-challenged microglia assays, behavioral and electrophysiological readouts","journal":"Brain, behavior, and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo pharmacological blockade of OXTR combined with in vitro mechanistic assays and RNA-seq pathway identification, single lab","pmids":["37648002"],"is_preprint":false},{"year":2019,"finding":"Maternal high fat diet-induced obesity increases Oxtr mRNA expression ~2-fold in the hippocampus of male but not female offspring at GD17.5, associated with increased binding of active histone mark H3K9Ac at the Oxtr transcriptional start site specifically in male offspring.","method":"Mouse maternal HFD model, RT-qPCR, chromatin immunoprecipitation (ChIP) for H3K9Ac at Oxtr TSS","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP directly links histone modification to Oxtr transcription in a sex-specific manner, single lab, single study","pmids":["30650536"],"is_preprint":false},{"year":2015,"finding":"OXTR expression in placental trophoblast cells is significantly upregulated (~3–7-fold) in women who delivered vaginally (with uterine contractile activity) compared to those who delivered by cesarean section without labor, indicating that myometrial contractility upregulates trophoblast OXTR expression.","method":"Immunohistochemistry with quantitative morphometry, Western blot on placental tissue, primary cytotrophoblast cell culture, comparison of labor vs. non-labor delivery groups","journal":"BMC pregnancy and childbirth","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct protein quantification in tissue and primary culture with defined biological comparison, replicated across tissue and cell models in same study, single lab","pmids":["26377392"],"is_preprint":false},{"year":2019,"finding":"Perinatal BPA exposure eliminates sexually dimorphic OTR expression in three hypothalamic regions and alters OTR expression in the BNST of juvenile rats, demonstrating that endocrine disruption by BPA impacts regional brain OTR distribution in a sex-specific manner.","method":"Rat CLARITY-BPA model (perinatal gavage exposure), receptor binding autoradiography across brain regions","journal":"Neurotoxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct receptor binding measurement across multiple brain regions with sex-stratified analysis in a large regulatory study, single lab","pmids":["31251963"],"is_preprint":false},{"year":2020,"finding":"Oxtr-expressing neurons in prairie vole that project to the nucleus accumbens (NAcc) were mapped using Oxtr-ires-Cre knock-in voles; Oxtr-expressing neurons projecting to NAcc originate from anterior olfactory nucleus, PFC, ACC, insular cortex, paraventricular thalamus, basolateral amygdala, and cortical amygdaloid areas, defining OXTR-dependent circuits for social behavior.","method":"CRISPR/Cas9 Oxtr-ires-Cre knock-in prairie voles, retrograde Cre-dependent EGFP AAV tracing from NAcc, fluorescence imaging, mRNA co-localization validation","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knock-in with viral circuit tracing and mRNA validation provides circuit-level mechanism, single lab, novel organism model","pmids":["33092784"],"is_preprint":false},{"year":2019,"finding":"OXTR DNA methylation modulates the effect of intranasal oxytocin on brain responses to social interaction (Prisoner's Dilemma fMRI); OXTR methylation did not modulate OT effects in previously reported regions (caudate, amygdala, insula) but did modulate OT effects on precuneus, visual cortex, and lateral septum, with some effects being sex-specific in rs53576 GG individuals.","method":"Pharmacological fMRI with intranasal OT vs. placebo, OXTR methylation measurement from blood, correlation of methylation with blood-oxygen-level-dependent (BOLD) signal","journal":"Genes, brain, and behavior","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct test of epigenetic modulation of receptor-mediated pharmacological response in human brain imaging, single lab","pmids":["30624029"],"is_preprint":false},{"year":2018,"finding":"Increased OXTR DNA methylation is associated with attenuated resting parasympathetic tone (lower high-frequency heart rate variability), and this relationship is mediated by increased gray matter volume of the central amygdala.","method":"OXTR methylation from blood, high-frequency heart rate variability measurement, structural MRI amygdala morphometry, mediation analysis (N=79)","journal":"Social cognitive and affective neuroscience","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single-method correlational study with mediation analysis but no direct functional manipulation of OXTR methylation, single lab","pmids":["30257007"],"is_preprint":false},{"year":2022,"finding":"OXTR protein forms aggregates in MPS I and MPS II patient-derived cells; these aggregates disappear upon treatment with the enzyme deficient in the respective MPS type (causing GAG degradation), suggesting that accumulated GAGs interact with OXTR to induce aggregate formation rather than changes in OXTR expression levels.","method":"Transcriptomic analysis of MPS patient cells, immunofluorescence for OXTR protein aggregates, enzyme replacement treatment, comparison with gene/protein expression levels","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct observation of protein aggregation with enzyme rescue experiment demonstrating GAG-OXTR interaction, single lab","pmids":["35537249"],"is_preprint":false},{"year":2017,"finding":"Sequence variants in the OXTR gene, including one missense mutation, were identified in MRKHS patients with uterovaginal aplasia, suggesting OXTR mutations may impair receptor function and contribute to defective uterine development.","method":"Direct DNA sequencing of full OXTR coding sequence in 93 MRKHS patients","journal":"Acta obstetricia et gynecologica Scandinavica","confidence":"Low","confidence_rationale":"Tier 3 / Weak — sequencing identifies missense variant but no functional validation of receptor impairment was performed, single lab","pmids":["28815558"],"is_preprint":false}],"current_model":"OXTR is a G protein-coupled receptor that, upon oxytocin binding, activates multiple intracellular signaling pathways including Gαq/ERK5/STAT3, nNOS/NO/KATP, and ERK; it is expressed in a wide range of tissues including myometrium, brain (particularly NAcc-projecting circuits involving PFC, ACC, amygdala, and septum), enteric neurons at adherens junctions, and placental trophoblast; its expression is epigenetically regulated by DNA methylation (controlled in part by TET1-mediated demethylation) and histone acetylation; in the uterus it mediates contractility downstream of progesterone receptor isoform B via an Oxtr-Plcl2-Trpc3 pathway; in the brain, septal OXTR neurons drive anxiety via inhibitory GABAergic projections to the HDB, while NAcc-projecting OXTR circuits regulate social bonding; OXTR protein can form GAG-induced aggregates in lysosomal storage disease cells; and in cancer-associated fibroblasts, OXTR activates nuclear ERK5 signaling via Gαq/CDC37 to promote tumor invasion."},"narrative":{"mechanistic_narrative":"OXTR is the oxytocin receptor, a G protein-coupled receptor that couples oxytocin binding to multiple intracellular signaling cascades and governs processes ranging from uterine contractility to social and affective behavior [PMID:33707208, PMID:34489531]. In myometrium, OXTR drives smooth muscle contraction through a Plcl2-Trpc3 pathway that lies downstream of progesterone receptor isoform B, which suppresses contractility by lowering Oxtr and Trpc3 while raising Plcl2 [PMID:33707208]; its overexpression in myometrial cells is associated with heightened contractile amplitude [PMID:22999795]. In the nervous system, distinct OXTR-expressing circuits partition behavior: septal OXTR neurons are GABAergic and project inhibitory fibers to the horizontal diagonal band to drive anxiety-like behavior [PMID:34489531], whereas OXTR neurons projecting to the nucleus accumbens from cortical, thalamic, and amygdalar sources define circuitry for social behavior [PMID:33092784]. Oxytocin acting through OXTR also down-regulates mesenteric afferent sensitivity via an enteric nNOS/NO/KATP pathway [PMID:25346204] and confers hippocampal neuroprotection in sepsis-associated encephalopathy through OXTR-ERK-STAT3 signaling that limits microglial inflammation [PMID:37648002]; in cancer-associated fibroblasts, OXTR activates nuclear ERK5 via Gαq and CDC37 to sustain a CCL26-dependent pro-invasive phenotype [PMID:36045118]. Oxtr expression is epigenetically controlled, with TET1-mediated demethylation of Oxtr CpG islands required for normal expression, maternal care, social behavior, and oxytocin-evoked synaptic responses [PMID:30518695], and with histone modifications further tuning expression in a developmental and sex-specific manner [PMID:30650536].","teleology":[{"year":2009,"claim":"Established that OTR is present in the enteric nervous system and intestinal epithelium with developmentally regulated, junction-localized expression, extending receptor function beyond classical reproductive tissue.","evidence":"RT-PCR, immunofluorescence co-localization, and immunoelectron microscopy across a developmental time course","pmids":["19003903"],"confidence":"Medium","gaps":["No loss-of-function test of OTR's role in ENS development","Functional consequence of adherens junction localization undefined"]},{"year":2012,"claim":"Linked OXTR overexpression to pathological uterine contractility and showed its expression is sensitive to histone deacetylase inhibition, connecting receptor abundance to disease severity and epigenetic control.","evidence":"Western blot quantification, in vitro contractility assay, and pharmacological inhibition (TSA, andrographolide) in primary myometrial smooth muscle cells","pmids":["22999795"],"confidence":"Medium","gaps":["Correlational link between OXTR level and contractility, not causal","TSA/andrographolide effects not OXTR-specific"]},{"year":2014,"claim":"Defined the downstream effector chain by which enteric OTR dampens visceral afferent signaling, identifying an nNOS/NO/KATP pathway.","evidence":"In vitro mesenteric afferent discharge recording with pharmacological blockade (L-NAME, NPLA, glibenclamide) and nNOS co-localization","pmids":["25346204"],"confidence":"High","gaps":["Single lab","Receptor coupling step linking OTR to nNOS not resolved"]},{"year":2015,"claim":"Showed that uterine contractile activity itself upregulates OXTR in placental trophoblast, indicating mechanical/labor feedback onto receptor expression.","evidence":"Immunohistochemistry, Western blot, and cytotrophoblast culture comparing labor versus non-labor cesarean delivery","pmids":["26377392"],"confidence":"Medium","gaps":["Mechanism by which contractility signals to trophoblast OXTR unknown","Functional role of trophoblast OXTR undefined"]},{"year":2017,"claim":"Implicated OXTR sequence variation in defective uterine development, raising a candidate disease association with uterovaginal aplasia.","evidence":"Direct sequencing of OXTR coding region in 93 MRKHS patients","pmids":["28815558"],"confidence":"Low","gaps":["No functional validation that the missense variant impairs receptor function","No causal genetic evidence linking variant to phenotype"]},{"year":2018,"claim":"Demonstrated that TET1-mediated DNA demethylation is required to maintain Oxtr expression, tying an epigenetic enzyme to oxytocin-dependent synaptic and social behavior.","evidence":"Tet1 knockout mice with CpG methylation analysis, isoform RT-PCR, behavioral assays, and synaptic physiology","pmids":["30518695"],"confidence":"High","gaps":["TET1 acts on many loci; behavioral phenotype not formally rescued by restoring Oxtr alone","Which Oxtr isoforms drive each phenotype unresolved"]},{"year":2018,"claim":"Correlated OXTR methylation with autonomic tone via amygdala structure, beginning to connect receptor epigenetics to physiology in humans.","evidence":"Blood OXTR methylation, heart rate variability, structural MRI, and mediation analysis (N=79)","pmids":["30257007"],"confidence":"Low","gaps":["Correlational with no functional manipulation of OXTR methylation","Blood methylation may not reflect brain","Small sample"]},{"year":2019,"claim":"Showed sex-specific histone-mediated regulation of Oxtr by maternal diet, providing a chromatin mechanism for environmental programming of receptor expression.","evidence":"Maternal high-fat-diet mouse model with RT-qPCR and ChIP for H3K9Ac at the Oxtr TSS","pmids":["30650536"],"confidence":"Medium","gaps":["Single mark, single locus; causality of H3K9Ac for expression not tested","Functional consequence of hippocampal Oxtr change unknown"]},{"year":2019,"claim":"Demonstrated that endocrine disruption (BPA) reshapes regional and sexually dimorphic brain OTR distribution, showing receptor expression is environmentally malleable.","evidence":"Rat CLARITY-BPA perinatal exposure model with receptor binding autoradiography","pmids":["31251963"],"confidence":"Medium","gaps":["Mechanism linking BPA to OTR expression changes unknown","Behavioral consequences not established"]},{"year":2020,"claim":"Mapped the source neurons of OXTR-dependent NAcc-projecting circuits, providing anatomical substrate for oxytocin regulation of social behavior.","evidence":"CRISPR Oxtr-ires-Cre knock-in prairie voles with retrograde Cre-dependent AAV tracing and mRNA validation","pmids":["33092784"],"confidence":"Medium","gaps":["Circuit anatomy without functional manipulation","Contribution of each input region to behavior unresolved"]},{"year":2021,"claim":"Placed OXTR within a defined uterine signaling module downstream of progesterone receptor isoform B, defining the Oxtr-Plcl2-Trpc3 contractility pathway.","evidence":"PGR-A/PGR-B smooth-muscle transgenic mice, uterine RNA-seq, ex vivo/in vivo contractility, and CRISPRa functional assays","pmids":["33707208"],"confidence":"High","gaps":["Direct biochemical coupling between OXTR, PLCL2, and TRPC3 not shown","Human relevance not tested"]},{"year":2021,"claim":"Resolved a behaviorally distinct OXTR circuit, showing septal OXTR neurons are GABAergic and drive anxiety through inhibitory projections to the HDB.","evidence":"Chemogenetics, optogenetics, vGAT immunofluorescence, circuit tracing, and anxiety assays","pmids":["34489531"],"confidence":"High","gaps":["Endogenous oxytocin signal driving these neurons not defined","Receptor-level signaling in these neurons not dissected"]},{"year":2022,"claim":"Defined a pro-tumor OXTR signaling axis in cancer-associated fibroblasts, where OXTR activates nuclear ERK5 via Gαq/CDC37 to sustain CCL26-dependent invasion.","evidence":"CAF characterization, signaling pathway dissection (Gαq/CDC37/ERK5), CCL26 functional requirement, and ERK5 ablation","pmids":["36045118"],"confidence":"High","gaps":["Whether oxytocin ligand drives the CAF phenotype not established","CDC37-OXTR-ERK5 connection mechanism incompletely defined"]},{"year":2022,"claim":"Revealed a non-signaling pathology in which accumulated GAGs induce OXTR protein aggregation in lysosomal storage disease cells, reversible by GAG-degrading enzyme.","evidence":"MPS patient-derived cells with immunofluorescence for OXTR aggregates and enzyme replacement rescue","pmids":["35537249"],"confidence":"Medium","gaps":["Functional consequence of OXTR aggregation unknown","Direct GAG-OXTR binding not demonstrated"]},{"year":2023,"claim":"Identified OXTR-ERK-STAT3 signaling as the route for oxytocin neuroprotection in sepsis-associated encephalopathy, linking the receptor to anti-inflammatory microglial modulation.","evidence":"CLP mouse SAE model with OXTR antagonist blockade (L-368,899), RNA-seq, LPS-challenged microglia assays, and behavioral/electrophysiological readouts","pmids":["37648002"],"confidence":"Medium","gaps":["Cell type mediating OXTR-ERK-STAT3 effect not pinpointed","Single lab"]},{"year":null,"claim":"How OXTR couples to its divergent downstream effectors (Gαq/ERK5, ERK/STAT3, nNOS/NO/KATP, Plcl2/Trpc3) in a tissue- and cell-type-specific manner, and how epigenetic state sets receptor abundance to gate these outputs, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying biochemical model linking ligand binding to pathway selection","Determinants of tissue-specific effector coupling unknown","Causal chain from methylation/histone state to phenotype not fully closed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[2,4,5,6]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,6,7]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[4]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[5,11]}],"complexes":[],"partners":["GNAQ","CDC37"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P30559","full_name":"Oxytocin receptor","aliases":[],"length_aa":389,"mass_kda":42.8,"function":"Receptor for oxytocin. The activity of this receptor is mediated by G proteins which activate a phosphatidylinositol-calcium second messenger system","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P30559/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/OXTR","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/OXTR","total_profiled":1310},"omim":[{"mim_id":"612094","title":"MICRO RNA 429; MIRN429","url":"https://www.omim.org/entry/612094"},{"mim_id":"612091","title":"MICRO RNA 200B; MIRN200B","url":"https://www.omim.org/entry/612091"},{"mim_id":"605802","title":"ZINC FINGER E BOX-BINDING HOMEOBOX 2; ZEB2","url":"https://www.omim.org/entry/605802"},{"mim_id":"604877","title":"MAF bZIP TRANSCRIPTION FACTOR F; MAFF","url":"https://www.omim.org/entry/604877"},{"mim_id":"601253","title":"CAVEOLIN 3; CAV3","url":"https://www.omim.org/entry/601253"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"breast","ntpm":50.5}],"url":"https://www.proteinatlas.org/search/OXTR"},"hgnc":{"alias_symbol":["OTR"],"prev_symbol":[]},"alphafold":{"accession":"P30559","domains":[{"cath_id":"1.20.1070.10","chopping":"37-241_265-346","consensus_level":"high","plddt":90.6836,"start":37,"end":346}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P30559","model_url":"https://alphafold.ebi.ac.uk/files/AF-P30559-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P30559-F1-predicted_aligned_error_v6.png","plddt_mean":78.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=OXTR","jax_strain_url":"https://www.jax.org/strain/search?query=OXTR"},"sequence":{"accession":"P30559","fasta_url":"https://rest.uniprot.org/uniprotkb/P30559.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P30559/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P30559"}},"corpus_meta":[{"pmid":"15992526","id":"PMC_15992526","title":"Positive association of the oxytocin receptor gene (OXTR) with autism in the Chinese Han population.","date":"2005","source":"Biological psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/15992526","citation_count":379,"is_preprint":false},{"pmid":"19015103","id":"PMC_19015103","title":"Oxytocin receptor (OXTR) and serotonin transporter (5-HTT) genes associated with observed parenting.","date":"2008","source":"Social cognitive and affective neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/19015103","citation_count":339,"is_preprint":false},{"pmid":"17383819","id":"PMC_17383819","title":"Association of the oxytocin receptor gene (OXTR) in Caucasian children and adolescents with autism.","date":"2007","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/17383819","citation_count":310,"is_preprint":false},{"pmid":"22336563","id":"PMC_22336563","title":"Sensitive parenting is associated with plasma oxytocin and polymorphisms in the OXTR and CD38 genes.","date":"2012","source":"Biological psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/22336563","citation_count":274,"is_preprint":false},{"pmid":"17893705","id":"PMC_17893705","title":"Association between the oxytocin receptor (OXTR) gene and autism: relationship to Vineland Adaptive Behavior Scales and cognition.","date":"2007","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/17893705","citation_count":265,"is_preprint":false},{"pmid":"25092245","id":"PMC_25092245","title":"The oxytocin receptor gene (OXTR) is associated with autism spectrum disorder: a meta-analysis.","date":"2014","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/25092245","citation_count":257,"is_preprint":false},{"pmid":"20724662","id":"PMC_20724662","title":"Culture, distress, and oxytocin receptor polymorphism (OXTR) interact to influence emotional support seeking.","date":"2010","source":"Proceedings of the National Academy of Sciences of the United States of 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/35537249","citation_count":12,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47756,"output_tokens":4188,"usd":0.103044,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12192,"output_tokens":4385,"usd":0.085292,"stage2_stop_reason":"end_turn"},"total_usd":0.188336,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"OTR is expressed in enteric neurons (including intrinsic primary afferent neurons identified by NeuN co-localization) and intestinal epithelium, with developmentally regulated expression peaking at postnatal day 7; OTR protein was detected at plasmalemmal enterocyte adherens junctions by immunoelectron microscopy, suggesting a role in ENS development and epithelial biology.\",\n      \"method\": \"RT-PCR, immunofluorescence co-localization, immunoelectron microscopy, developmental time-course analysis\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with ultrastructural resolution and multiple orthogonal methods in one study, but single lab without functional loss-of-function validation\",\n      \"pmids\": [\"19003903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"OXTR is overexpressed in myometrial smooth muscle cells from adenomyosis patients compared to controls; overexpression correlates with increased uterine contractile amplitude and dysmenorrhea severity; histone deacetylase inhibitor TSA and andrographolide dose-dependently inhibit OTR expression in these cells.\",\n      \"method\": \"Western blot quantification of OTR protein in primary MSMC cultures, in vitro contractility assay, pharmacological inhibition with TSA and andrographolide\",\n      \"journal\": \"Fertility and sterility\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein quantification with functional contractility readout and pharmacological manipulation, single lab\",\n      \"pmids\": [\"22999795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Oxytocin down-regulates mesenteric afferent sensitivity through the enteric OTR/nNOS/NO/KATP pathway: OTR co-localizes with nNOS in myenteric plexus neurons; OTR-mediated attenuation of bradykinin- or distension-evoked afferent discharge is blocked by NOS inhibitors (L-NAME, NPLA), N/P-type calcium channel antagonists, and KATP blocker glibenclamide.\",\n      \"method\": \"In vitro mesenteric afferent discharge recording, immunofluorescence co-localization, pharmacological blockade with L-NAME/NPLA/glibenclamide\",\n      \"journal\": \"Neurogastroenterology and motility\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro functional assay with multiple pharmacological pathway dissections and immunofluorescence co-localization, single lab but orthogonal methods\",\n      \"pmids\": [\"25346204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TET1 protein regulates Oxtr expression by preventing DNA hypermethylation of Oxtr CpG islands during early development; Tet1-deficient mice show reduced select Oxtr mRNA isoforms, hypermethylation of Oxtr CpG islands persisting into adulthood, impaired maternal care, impaired social behavior, and reduced synaptic responses to oxytocin stimulation.\",\n      \"method\": \"Tet1 knockout mice (exon 4 deletion), RT-PCR isoform analysis, CpG methylation analysis, behavioral assays (maternal care, social behavior), synaptic physiology\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with multiple orthogonal readouts (methylation, expression, behavior, physiology) in a single rigorous study\",\n      \"pmids\": [\"30518695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Progesterone receptor isoform B (PGR-B) suppresses uterine contractility by reducing Oxtr and Trpc3 expression and increasing Plcl2 expression in myometrium; both PLCL1 and PLCL2 can attenuate uterine muscle cell contraction in a CRISPRa-based assay, defining an Oxtr-Plcl2-Trpc3 pathway downstream of PGR-B.\",\n      \"method\": \"Transgenic mouse models overexpressing PGR-A or PGR-B in smooth muscle, uterine RNA sequencing, ex vivo and in vivo contractility assays, CRISPRa functional assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo genetic models with RNA-seq pathway identification, ex vivo/in vivo functional assays, and CRISPRa functional validation in one study\",\n      \"pmids\": [\"33707208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Chemogenetic activation of septal neurons expressing OXTr induces anxiety-like but not depressive-like behavior; septal OXTr neurons express vGAT (vesicular GABA transporter) and project inhibitory GABAergic fibers to the horizontal diagonal band of Broca (HDB); optogenetic stimulation of septal OXTr→HDB projections inactivates HDB neurons and elicits anxiety-like behavior.\",\n      \"method\": \"Chemogenetics (DREADD), optogenetics, immunofluorescence for vGAT, behavioral anxiety assays, circuit tracing\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (chemogenetics, optogenetics, circuit anatomy) with defined cellular and behavioral phenotype in single study\",\n      \"pmids\": [\"34489531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OXTRHigh cancer-associated fibroblasts (CAFs) promote invasion of oral squamous cell carcinoma via ERK5 nuclear transcription signaling: OXTR activates nuclear ERK5 via Gαq and CDC37 to maintain high levels of OXTR and CCL26; CCL26 is required for the invasive phenotype of CCR3+ tumors; ERK5 ablation reprograms the pro-invasive phenotype of OXTRHigh CAFs.\",\n      \"method\": \"CAF characterization, gene expression analysis, signaling pathway dissection (Gαq/CDC37/ERK5), CCL26 functional requirement, ERK5 ablation experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway dissection with loss-of-function (ERK5 ablation) and defined phenotypic readout, multiple orthogonal approaches in one rigorous study\",\n      \"pmids\": [\"36045118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Oxytocin alleviates sepsis-associated encephalopathy cognitive/memory deficits and hippocampal synaptic dysfunction via OXTR; OXTR antagonist L-368,899 (intraperitoneal or local CA1 injection) blocks OXT-mediated neuroprotection; OXT reduces microglial phagocytosis and inflammatory cytokine release; the OXTR-ERK-STAT3 signaling pathway mediates the neuroprotective effects of OXT in SAE.\",\n      \"method\": \"CLP mouse model of SAE, intranasal OXT administration, OXTR antagonist blockade, RNA sequencing for pathway identification, in vitro LPS-challenged microglia assays, behavioral and electrophysiological readouts\",\n      \"journal\": \"Brain, behavior, and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo pharmacological blockade of OXTR combined with in vitro mechanistic assays and RNA-seq pathway identification, single lab\",\n      \"pmids\": [\"37648002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Maternal high fat diet-induced obesity increases Oxtr mRNA expression ~2-fold in the hippocampus of male but not female offspring at GD17.5, associated with increased binding of active histone mark H3K9Ac at the Oxtr transcriptional start site specifically in male offspring.\",\n      \"method\": \"Mouse maternal HFD model, RT-qPCR, chromatin immunoprecipitation (ChIP) for H3K9Ac at Oxtr TSS\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP directly links histone modification to Oxtr transcription in a sex-specific manner, single lab, single study\",\n      \"pmids\": [\"30650536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"OXTR expression in placental trophoblast cells is significantly upregulated (~3–7-fold) in women who delivered vaginally (with uterine contractile activity) compared to those who delivered by cesarean section without labor, indicating that myometrial contractility upregulates trophoblast OXTR expression.\",\n      \"method\": \"Immunohistochemistry with quantitative morphometry, Western blot on placental tissue, primary cytotrophoblast cell culture, comparison of labor vs. non-labor delivery groups\",\n      \"journal\": \"BMC pregnancy and childbirth\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct protein quantification in tissue and primary culture with defined biological comparison, replicated across tissue and cell models in same study, single lab\",\n      \"pmids\": [\"26377392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Perinatal BPA exposure eliminates sexually dimorphic OTR expression in three hypothalamic regions and alters OTR expression in the BNST of juvenile rats, demonstrating that endocrine disruption by BPA impacts regional brain OTR distribution in a sex-specific manner.\",\n      \"method\": \"Rat CLARITY-BPA model (perinatal gavage exposure), receptor binding autoradiography across brain regions\",\n      \"journal\": \"Neurotoxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct receptor binding measurement across multiple brain regions with sex-stratified analysis in a large regulatory study, single lab\",\n      \"pmids\": [\"31251963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Oxtr-expressing neurons in prairie vole that project to the nucleus accumbens (NAcc) were mapped using Oxtr-ires-Cre knock-in voles; Oxtr-expressing neurons projecting to NAcc originate from anterior olfactory nucleus, PFC, ACC, insular cortex, paraventricular thalamus, basolateral amygdala, and cortical amygdaloid areas, defining OXTR-dependent circuits for social behavior.\",\n      \"method\": \"CRISPR/Cas9 Oxtr-ires-Cre knock-in prairie voles, retrograde Cre-dependent EGFP AAV tracing from NAcc, fluorescence imaging, mRNA co-localization validation\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knock-in with viral circuit tracing and mRNA validation provides circuit-level mechanism, single lab, novel organism model\",\n      \"pmids\": [\"33092784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"OXTR DNA methylation modulates the effect of intranasal oxytocin on brain responses to social interaction (Prisoner's Dilemma fMRI); OXTR methylation did not modulate OT effects in previously reported regions (caudate, amygdala, insula) but did modulate OT effects on precuneus, visual cortex, and lateral septum, with some effects being sex-specific in rs53576 GG individuals.\",\n      \"method\": \"Pharmacological fMRI with intranasal OT vs. placebo, OXTR methylation measurement from blood, correlation of methylation with blood-oxygen-level-dependent (BOLD) signal\",\n      \"journal\": \"Genes, brain, and behavior\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct test of epigenetic modulation of receptor-mediated pharmacological response in human brain imaging, single lab\",\n      \"pmids\": [\"30624029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Increased OXTR DNA methylation is associated with attenuated resting parasympathetic tone (lower high-frequency heart rate variability), and this relationship is mediated by increased gray matter volume of the central amygdala.\",\n      \"method\": \"OXTR methylation from blood, high-frequency heart rate variability measurement, structural MRI amygdala morphometry, mediation analysis (N=79)\",\n      \"journal\": \"Social cognitive and affective neuroscience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single-method correlational study with mediation analysis but no direct functional manipulation of OXTR methylation, single lab\",\n      \"pmids\": [\"30257007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OXTR protein forms aggregates in MPS I and MPS II patient-derived cells; these aggregates disappear upon treatment with the enzyme deficient in the respective MPS type (causing GAG degradation), suggesting that accumulated GAGs interact with OXTR to induce aggregate formation rather than changes in OXTR expression levels.\",\n      \"method\": \"Transcriptomic analysis of MPS patient cells, immunofluorescence for OXTR protein aggregates, enzyme replacement treatment, comparison with gene/protein expression levels\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct observation of protein aggregation with enzyme rescue experiment demonstrating GAG-OXTR interaction, single lab\",\n      \"pmids\": [\"35537249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sequence variants in the OXTR gene, including one missense mutation, were identified in MRKHS patients with uterovaginal aplasia, suggesting OXTR mutations may impair receptor function and contribute to defective uterine development.\",\n      \"method\": \"Direct DNA sequencing of full OXTR coding sequence in 93 MRKHS patients\",\n      \"journal\": \"Acta obstetricia et gynecologica Scandinavica\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — sequencing identifies missense variant but no functional validation of receptor impairment was performed, single lab\",\n      \"pmids\": [\"28815558\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"OXTR is a G protein-coupled receptor that, upon oxytocin binding, activates multiple intracellular signaling pathways including Gαq/ERK5/STAT3, nNOS/NO/KATP, and ERK; it is expressed in a wide range of tissues including myometrium, brain (particularly NAcc-projecting circuits involving PFC, ACC, amygdala, and septum), enteric neurons at adherens junctions, and placental trophoblast; its expression is epigenetically regulated by DNA methylation (controlled in part by TET1-mediated demethylation) and histone acetylation; in the uterus it mediates contractility downstream of progesterone receptor isoform B via an Oxtr-Plcl2-Trpc3 pathway; in the brain, septal OXTR neurons drive anxiety via inhibitory GABAergic projections to the HDB, while NAcc-projecting OXTR circuits regulate social bonding; OXTR protein can form GAG-induced aggregates in lysosomal storage disease cells; and in cancer-associated fibroblasts, OXTR activates nuclear ERK5 signaling via Gαq/CDC37 to promote tumor invasion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"OXTR is the oxytocin receptor, a G protein-coupled receptor that couples oxytocin binding to multiple intracellular signaling cascades and governs processes ranging from uterine contractility to social and affective behavior [#4, #5]. In myometrium, OXTR drives smooth muscle contraction through a Plcl2-Trpc3 pathway that lies downstream of progesterone receptor isoform B, which suppresses contractility by lowering Oxtr and Trpc3 while raising Plcl2 [#4]; its overexpression in myometrial cells is associated with heightened contractile amplitude [#1]. In the nervous system, distinct OXTR-expressing circuits partition behavior: septal OXTR neurons are GABAergic and project inhibitory fibers to the horizontal diagonal band to drive anxiety-like behavior [#5], whereas OXTR neurons projecting to the nucleus accumbens from cortical, thalamic, and amygdalar sources define circuitry for social behavior [#11]. Oxytocin acting through OXTR also down-regulates mesenteric afferent sensitivity via an enteric nNOS/NO/KATP pathway [#2] and confers hippocampal neuroprotection in sepsis-associated encephalopathy through OXTR-ERK-STAT3 signaling that limits microglial inflammation [#7]; in cancer-associated fibroblasts, OXTR activates nuclear ERK5 via Gαq and CDC37 to sustain a CCL26-dependent pro-invasive phenotype [#6]. Oxtr expression is epigenetically controlled, with TET1-mediated demethylation of Oxtr CpG islands required for normal expression, maternal care, social behavior, and oxytocin-evoked synaptic responses [#3], and with histone modifications further tuning expression in a developmental and sex-specific manner [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established that OTR is present in the enteric nervous system and intestinal epithelium with developmentally regulated, junction-localized expression, extending receptor function beyond classical reproductive tissue.\",\n      \"evidence\": \"RT-PCR, immunofluorescence co-localization, and immunoelectron microscopy across a developmental time course\",\n      \"pmids\": [\"19003903\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No loss-of-function test of OTR's role in ENS development\", \"Functional consequence of adherens junction localization undefined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked OXTR overexpression to pathological uterine contractility and showed its expression is sensitive to histone deacetylase inhibition, connecting receptor abundance to disease severity and epigenetic control.\",\n      \"evidence\": \"Western blot quantification, in vitro contractility assay, and pharmacological inhibition (TSA, andrographolide) in primary myometrial smooth muscle cells\",\n      \"pmids\": [\"22999795\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlational link between OXTR level and contractility, not causal\", \"TSA/andrographolide effects not OXTR-specific\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the downstream effector chain by which enteric OTR dampens visceral afferent signaling, identifying an nNOS/NO/KATP pathway.\",\n      \"evidence\": \"In vitro mesenteric afferent discharge recording with pharmacological blockade (L-NAME, NPLA, glibenclamide) and nNOS co-localization\",\n      \"pmids\": [\"25346204\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single lab\", \"Receptor coupling step linking OTR to nNOS not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed that uterine contractile activity itself upregulates OXTR in placental trophoblast, indicating mechanical/labor feedback onto receptor expression.\",\n      \"evidence\": \"Immunohistochemistry, Western blot, and cytotrophoblast culture comparing labor versus non-labor cesarean delivery\",\n      \"pmids\": [\"26377392\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which contractility signals to trophoblast OXTR unknown\", \"Functional role of trophoblast OXTR undefined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Implicated OXTR sequence variation in defective uterine development, raising a candidate disease association with uterovaginal aplasia.\",\n      \"evidence\": \"Direct sequencing of OXTR coding region in 93 MRKHS patients\",\n      \"pmids\": [\"28815558\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No functional validation that the missense variant impairs receptor function\", \"No causal genetic evidence linking variant to phenotype\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated that TET1-mediated DNA demethylation is required to maintain Oxtr expression, tying an epigenetic enzyme to oxytocin-dependent synaptic and social behavior.\",\n      \"evidence\": \"Tet1 knockout mice with CpG methylation analysis, isoform RT-PCR, behavioral assays, and synaptic physiology\",\n      \"pmids\": [\"30518695\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"TET1 acts on many loci; behavioral phenotype not formally rescued by restoring Oxtr alone\", \"Which Oxtr isoforms drive each phenotype unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Correlated OXTR methylation with autonomic tone via amygdala structure, beginning to connect receptor epigenetics to physiology in humans.\",\n      \"evidence\": \"Blood OXTR methylation, heart rate variability, structural MRI, and mediation analysis (N=79)\",\n      \"pmids\": [\"30257007\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Correlational with no functional manipulation of OXTR methylation\", \"Blood methylation may not reflect brain\", \"Small sample\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed sex-specific histone-mediated regulation of Oxtr by maternal diet, providing a chromatin mechanism for environmental programming of receptor expression.\",\n      \"evidence\": \"Maternal high-fat-diet mouse model with RT-qPCR and ChIP for H3K9Ac at the Oxtr TSS\",\n      \"pmids\": [\"30650536\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single mark, single locus; causality of H3K9Ac for expression not tested\", \"Functional consequence of hippocampal Oxtr change unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that endocrine disruption (BPA) reshapes regional and sexually dimorphic brain OTR distribution, showing receptor expression is environmentally malleable.\",\n      \"evidence\": \"Rat CLARITY-BPA perinatal exposure model with receptor binding autoradiography\",\n      \"pmids\": [\"31251963\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking BPA to OTR expression changes unknown\", \"Behavioral consequences not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Mapped the source neurons of OXTR-dependent NAcc-projecting circuits, providing anatomical substrate for oxytocin regulation of social behavior.\",\n      \"evidence\": \"CRISPR Oxtr-ires-Cre knock-in prairie voles with retrograde Cre-dependent AAV tracing and mRNA validation\",\n      \"pmids\": [\"33092784\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Circuit anatomy without functional manipulation\", \"Contribution of each input region to behavior unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Placed OXTR within a defined uterine signaling module downstream of progesterone receptor isoform B, defining the Oxtr-Plcl2-Trpc3 contractility pathway.\",\n      \"evidence\": \"PGR-A/PGR-B smooth-muscle transgenic mice, uterine RNA-seq, ex vivo/in vivo contractility, and CRISPRa functional assays\",\n      \"pmids\": [\"33707208\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical coupling between OXTR, PLCL2, and TRPC3 not shown\", \"Human relevance not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved a behaviorally distinct OXTR circuit, showing septal OXTR neurons are GABAergic and drive anxiety through inhibitory projections to the HDB.\",\n      \"evidence\": \"Chemogenetics, optogenetics, vGAT immunofluorescence, circuit tracing, and anxiety assays\",\n      \"pmids\": [\"34489531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous oxytocin signal driving these neurons not defined\", \"Receptor-level signaling in these neurons not dissected\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined a pro-tumor OXTR signaling axis in cancer-associated fibroblasts, where OXTR activates nuclear ERK5 via Gαq/CDC37 to sustain CCL26-dependent invasion.\",\n      \"evidence\": \"CAF characterization, signaling pathway dissection (Gαq/CDC37/ERK5), CCL26 functional requirement, and ERK5 ablation\",\n      \"pmids\": [\"36045118\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether oxytocin ligand drives the CAF phenotype not established\", \"CDC37-OXTR-ERK5 connection mechanism incompletely defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed a non-signaling pathology in which accumulated GAGs induce OXTR protein aggregation in lysosomal storage disease cells, reversible by GAG-degrading enzyme.\",\n      \"evidence\": \"MPS patient-derived cells with immunofluorescence for OXTR aggregates and enzyme replacement rescue\",\n      \"pmids\": [\"35537249\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of OXTR aggregation unknown\", \"Direct GAG-OXTR binding not demonstrated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified OXTR-ERK-STAT3 signaling as the route for oxytocin neuroprotection in sepsis-associated encephalopathy, linking the receptor to anti-inflammatory microglial modulation.\",\n      \"evidence\": \"CLP mouse SAE model with OXTR antagonist blockade (L-368,899), RNA-seq, LPS-challenged microglia assays, and behavioral/electrophysiological readouts\",\n      \"pmids\": [\"37648002\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell type mediating OXTR-ERK-STAT3 effect not pinpointed\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How OXTR couples to its divergent downstream effectors (Gαq/ERK5, ERK/STAT3, nNOS/NO/KATP, Plcl2/Trpc3) in a tissue- and cell-type-specific manner, and how epigenetic state sets receptor abundance to gate these outputs, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying biochemical model linking ligand binding to pathway selection\", \"Determinants of tissue-specific effector coupling unknown\", \"Causal chain from methylation/histone state to phenotype not fully closed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [2, 4, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 6, 7]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [5, 11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GNAQ\", \"CDC37\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}