{"gene":"OXTR","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":2009,"finding":"OTR and OXT transcripts are expressed in enteric neurons and intestinal epithelium, with OTR immunoreactivity co-localizing 100% with the neural marker Hu in postnatal day 3 myenteric plexus neurons; intrinsic primary afferent neurons express OTR, and OTR is present at enterocyte adherens junctions as shown by immunoelectron microscopy, suggesting a role for OT/OTR signaling in ENS development and visceral sensory modulation.","method":"RT-PCR, immunofluorescence co-localization, immunoelectron microscopy, subcellular fractionation","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiments with multiple orthogonal methods in a single study","pmids":["19003903"],"is_preprint":false},{"year":2012,"finding":"Overexpression of oxytocin receptor (OTR) protein in myometrial smooth muscle cells (MSMCs) from adenomyosis patients correlates with increased uterine contractile amplitude; histone deacetylase inhibitor TSA and andrographolide dose-dependently inhibit OTR expression in MSMCs, implicating epigenetic regulation of OXTR in uterine contractility.","method":"Western blot quantification of OTR in cultured MSMCs, in vitro contractility assay, pharmacological inhibition (TSA, andrographolide)","journal":"Fertility and sterility","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional assay linking OXTR expression to contractility with pharmacological modulation","pmids":["22999795"],"is_preprint":false},{"year":2014,"finding":"Oxytocin down-regulates mesenteric afferent sensitivity via an OTR/nNOS/NO/KATP pathway: OTR co-localizes with nNOS in the longitudinal muscle myenteric plexus, and the inhibitory effect of oxytocin on bradykinin- or distention-evoked afferent discharge is blocked by the NOS inhibitors L-NAME and NPLA, and by KATP channel blocker glibenclamide.","method":"In vitro mesenteric afferent discharge recording, immunofluorescence co-localization, pharmacological dissection with NOS inhibitors and KATP blockers","journal":"Neurogastroenterology and motility","confidence":"High","confidence_rationale":"Tier 1-2 — functional in vitro assay with mechanistic pharmacological dissection and direct co-localization evidence","pmids":["25346204"],"is_preprint":false},{"year":2014,"finding":"Positive selection footprints are detected at OXTR amino acid sites across primates, with several OXTR changes promoting gain or loss of putative phosphorylation sites that may affect receptor internalization and desensitization; intramolecular and intermolecular coevolutionary processes between OXT and OXTR were detected.","method":"Phylogenetic analysis of OXT and OXTR sequences from 29 primate species, molecular dynamic simulations, coevolutionary analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — computational and comparative genomic analysis with structural modeling; no direct experimental validation of phosphorylation consequences","pmids":["25535371"],"is_preprint":false},{"year":2015,"finding":"Myometrial contractile activity during labor upregulates OXTR expression approximately 3.2–6.9-fold in placental trophoblast cells obtained from the maternal surface, compared to cesarean section without uterine contractions, suggesting a mechanosensitive positive-feedback regulation of OXTR in labor.","method":"Immunohistochemistry with morphometry, primary trophoblast cell culture, comparison of vaginal delivery vs. cesarean section placentae","journal":"BMC pregnancy and childbirth","confidence":"Medium","confidence_rationale":"Tier 2 — controlled human tissue comparison with quantitative protein measurement in primary cells","pmids":["26377392"],"is_preprint":false},{"year":2018,"finding":"TET1 deficiency causes hypermethylation of CpG islands in Oxtr during early development, reducing select Oxtr mRNA isoforms in the brain of Tet1Δe4-/- mice; this is associated with impaired maternal care, social behavior, and synaptic responses to oxytocin stimulation, establishing TET1 as an epigenetic writer that maintains Oxtr expression by preventing DNA hypermethylation.","method":"Tet1 mutant mouse generation (CRISPR/Cas9 deletion of exon 4), RT-PCR for mRNA isoforms, bisulfite sequencing of CpG islands, behavioral assays, synaptic electrophysiology","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1 — genetic loss-of-function in vivo with multiple orthogonal methods linking TET1 to OXTR methylation and functional consequences","pmids":["30518695"],"is_preprint":false},{"year":2021,"finding":"Progesterone receptor isoform B (PGR-B) suppresses uterine contractility by reducing Oxtr and Trpc3 expression while increasing Plcl2, establishing an Oxtr-Plcl2-Trpc3 pathway downstream of PGR-B; both PLCL2 and PLCL1 attenuate uterine muscle cell contraction in a CRISPRa-based assay, confirming this as a functional suppressive pathway.","method":"Transgenic mouse models (PGR-A or PGR-B overexpression in smooth muscle), uterine RNA sequencing, ex vivo and in vivo contractility assays, CRISPRa functional assay for PLCL2/PLCL1","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vivo genetic model with transcriptomic identification of pathway and orthogonal CRISPRa functional validation","pmids":["33707208"],"is_preprint":false},{"year":2021,"finding":"Chemogenetic activation of septal OXTr-expressing neurons induces anxiety-like but not depressive-like behavior; these neurons project GABAergic fibers to the horizontal diagonal band of Broca (HDB), and optogenetic stimulation of septal OXTr projections to HDB inactivates HDB neurons, revealing an inhibitory circuit mechanism by which OXTR-expressing septal neurons increase anxiety.","method":"Chemogenetics (DREADDs), optogenetics, anterograde tract tracing, electrophysiology, behavioral assays in mice","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 1 — cell-type-specific circuit dissection with chemogenetics and optogenetics in defined OXTR-expressing neurons","pmids":["34489531"],"is_preprint":false},{"year":2020,"finding":"Using Oxtr-ires-Cre knock-in prairie voles, OXTR-expressing neurons projecting to the nucleus accumbens (NAcc) were identified in multiple brain regions including anterior olfactory nucleus, PFC, ACC, insular cortex, paraventricular thalamus, basolateral amygdala, and cortical amygdaloid areas, establishing a detailed OXTR neural circuit map in the prairie vole, including a species-specific ACC→NAcc OXTR projection.","method":"CRISPR/Cas9 Oxtr-ires-Cre knock-in generation, retrograde Cre-dependent AAV tracing, fluorescence visualization, mRNA co-localization by in situ hybridization","journal":"Neuroscience","confidence":"High","confidence_rationale":"Tier 1 — genetically validated Cre knock-in with circuit-level retrograde tracing in a mammalian ortholog model","pmids":["33092784"],"is_preprint":false},{"year":2020,"finding":"Selective chemogenetic activation of OXTR-expressing neurons in the lateral septum (LS) rescues impaired social memory in both environmentally- (valproic acid) and genetically- (Nl3R451C knock-in) induced ASD mouse models; LS OXTR+ neurons are activated by social stimuli and project to the CA1 region of the hippocampus.","method":"Chemogenetics (hM3Dq DREADDs) in OXTR+ LS neurons, three-chamber social test, single-field social memory test, anterograde projection tracing in ASD mouse models","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 — cell-type-specific circuit intervention with two independent ASD models and behavioral rescue","pmids":["33335150"],"is_preprint":false},{"year":2022,"finding":"In oral squamous cell carcinoma, OXTRHigh cancer-associated fibroblasts (CAFs) activate nuclear ERK5 transcriptional signaling via Gαq and CDC37, maintaining high levels of OXTR and CCL26; CCL26 drives invasion of CCR3+ tumor cells, and ERK5 ablation reprograms the pro-invasive phenotype, establishing an OXTR→Gαq/CDC37→ERK5→CCL26 signaling axis in CAFs.","method":"Co-immunoprecipitation, RNA-seq, ERK5 ablation, CCL26 neutralization, invasion assays, OSCC patient tissue analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — mechanistic pathway defined with multiple orthogonal methods including co-IP, KO, and functional rescue","pmids":["36045118"],"is_preprint":false},{"year":2023,"finding":"In a sepsis-associated encephalopathy mouse model, hippocampal OXTR increases after CLP surgery; OXTR antagonist L-368,899 blocks intranasal OXT-mediated neuroprotection, and RNA sequencing identifies the OXTR-ERK-STAT3 signaling pathway as the mechanism by which OXT reduces microglial overactivation, restores synaptic function, and improves cognitive outcomes.","method":"CLP mouse model, intranasal OXT administration, OXTR antagonist injection (intraperitoneal and hippocampal CA1), RNA sequencing, microglial phagocytosis assay, cytokine measurement, behavioral assays","journal":"Brain, behavior, and immunity","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological receptor blockade with transcriptomic pathway identification and multiple functional readouts in vivo","pmids":["37648002"],"is_preprint":false},{"year":2022,"finding":"OXTR protein forms aggregates in MPS I and MPS II patient-derived cells due to interactions with accumulated glycosaminoglycans (GAGs); these aggregates disappear upon treatment with the deficient enzymes that degrade GAGs, indicating that GAG accumulation drives OXTR aggregate formation independent of changes in OXTR gene expression or protein levels.","method":"Transcriptomic analysis, immunofluorescence for OXTR aggregates in MPS patient cells, enzyme replacement treatment, correlation analysis of expression vs. aggregate formation","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — direct cell biological experiment with pharmacological rescue demonstrating GAG-OXTR interaction","pmids":["35537249"],"is_preprint":false},{"year":2019,"finding":"Maternal high fat diet-induced obesity increases Oxtr mRNA ~2-fold in male but not female offspring hippocampus at gestational day 17.5, associated with increased binding of the active histone mark H3K9Ac at the Oxtr transcriptional start site, demonstrating sex-specific epigenetic upregulation of Oxtr by maternal obesity.","method":"RT-PCR for Oxtr mRNA, chromatin immunoprecipitation (ChIP) for H3K9Ac at Oxtr TSS in offspring hippocampus, sex-stratified analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — direct ChIP experiment linking histone modification to Oxtr transcription in a defined biological context","pmids":["30650536"],"is_preprint":false},{"year":2019,"finding":"Perinatal bisphenol A (BPA) exposure eliminates sex differences in OTR expression in three hypothalamic regions of juvenile rats, with male OTR expression being more susceptible, as measured by receptor binding; this demonstrates that an endocrine-disrupting chemical can alter OTR expression in a sex- and brain-region-specific manner.","method":"Gavage BPA exposure spanning gestation and lactation in rats, OTR receptor binding assay across brain regions in juvenile offspring","journal":"Neurotoxicology","confidence":"Medium","confidence_rationale":"Tier 2 — controlled in vivo exposure study with quantitative receptor binding across multiple brain regions and sex comparisons","pmids":["31251963"],"is_preprint":false},{"year":2010,"finding":"Allelic expression imbalance (AEI) assays in lymphoblast cell lines and amygdala tissue identify cis-acting OXTR variants: rs237897 and rs237895 are associated with differential allelic abundance in lymphoblasts, and rs237895 also shows AEI in amygdala, while rs13316193 weakly correlates with total amygdala OXTR gene expression.","method":"Allelic expression imbalance (AEI) assay in lymphoblast cell lines and human amygdala tissue, correlation of genotype with RNA levels","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 2 — direct molecular assay of cis-regulatory effects on OXTR expression in relevant human tissue","pmids":["20303388"],"is_preprint":false},{"year":2019,"finding":"In a bioinformatic analysis, the rs1042778 G allele of OXTR creates a binding site for the transcription factor MAZ; when the T allele is present, MAZ cannot bind, suggesting lower transcriptional activity of the OXTR gene as a functional consequence of this SNP.","method":"Bioinformatic transcription factor binding site prediction for rs1042778 alleles","journal":"Journal of molecular neuroscience : MN","confidence":"Low","confidence_rationale":"Tier 4 — computational prediction only, not experimentally validated","pmids":["29858823"],"is_preprint":false}],"current_model":"OXTR is a G protein-coupled receptor that transduces oxytocin signaling through multiple downstream pathways (including Gαq/ERK5/STAT3 and nNOS/NO/KATP) in diverse tissues including brain circuits (lateral septum→hippocampus, septal GABAergic projections to HDB), myometrium, enteric neurons, and cancer-associated fibroblasts; its expression is epigenetically regulated by TET1-mediated DNA demethylation and histone acetylation, and by upstream transcriptional regulators such as progesterone receptor isoform B (PGR-B) which suppresses OXTR to maintain uterine quiescence via an Oxtr-Plcl2-Trpc3 axis."},"narrative":{"teleology":[{"year":2009,"claim":"The question of whether OXTR operates outside classic reproductive and central circuits was addressed by demonstrating OTR expression in enteric neurons and intestinal epithelium, expanding OXTR's functional territory to the enteric nervous system.","evidence":"RT-PCR, immunofluorescence co-localization with neural marker Hu, and immunoelectron microscopy in mouse postnatal myenteric plexus","pmids":["19003903"],"confidence":"Medium","gaps":["Functional consequence of OTR at enterocyte adherens junctions not tested","No loss-of-function study in enteric neurons"]},{"year":2010,"claim":"Whether common OXTR variants have cis-regulatory effects on gene expression was addressed by identifying allelic expression imbalance at rs237895 in human amygdala, establishing that genetic variation can directly modulate OXTR output in behaviorally relevant tissue.","evidence":"Allelic expression imbalance assay in human lymphoblast cell lines and amygdala tissue","pmids":["20303388"],"confidence":"Medium","gaps":["Causal variant not pinpointed","Functional consequence of differential OXTR expression from these alleles not tested"]},{"year":2012,"claim":"Whether OXTR expression is epigenetically modifiable was demonstrated by showing that histone deacetylase inhibition suppresses OTR protein in myometrial smooth muscle cells, linking OXTR to histone acetylation-dependent regulation and uterine contractility.","evidence":"Western blot and contractility assay with TSA and andrographolide treatment of cultured MSMCs from adenomyosis patients","pmids":["22999795"],"confidence":"Medium","gaps":["Specific histone marks and genomic loci not identified","No in vivo validation of HDAC inhibitor effects on OXTR"]},{"year":2014,"claim":"How OXTR modulates visceral sensory signaling was resolved by defining an OTR/nNOS/NO/KATP pathway through which oxytocin suppresses mesenteric afferent firing, establishing a complete signaling cascade from receptor to effector channel.","evidence":"In vitro mesenteric afferent discharge recording with sequential pharmacological blockade of NOS and KATP channels, plus immunofluorescence co-localization of OTR and nNOS","pmids":["25346204"],"confidence":"High","gaps":["Pathway not tested in vivo","Whether this cascade operates in other OXTR-expressing peripheral neurons is unknown"]},{"year":2018,"claim":"How OXTR expression is maintained in the brain was established by showing that TET1 prevents CpG island hypermethylation at the Oxtr locus; loss of TET1 reduces Oxtr mRNA isoforms and impairs maternal behavior and synaptic oxytocin responsiveness.","evidence":"Tet1 exon 4-deleted mice (CRISPR/Cas9), bisulfite sequencing, RT-PCR, behavioral assays, and synaptic electrophysiology","pmids":["30518695"],"confidence":"High","gaps":["Whether TET1 acts directly at Oxtr or via intermediate demethylation targets is not resolved","Rescue by Oxtr re-expression not performed"]},{"year":2019,"claim":"Whether OXTR is subject to sex-specific epigenetic regulation was addressed by demonstrating increased H3K9Ac at the Oxtr promoter in male but not female offspring hippocampus following maternal high-fat diet, revealing a sex-dimorphic histone-based mechanism.","evidence":"ChIP for H3K9Ac at Oxtr TSS and RT-PCR in sex-stratified offspring hippocampi from obese dams","pmids":["30650536"],"confidence":"Medium","gaps":["Causal link between H3K9Ac enrichment and Oxtr mRNA increase not established by loss-of-function","Downstream behavioral consequences not measured"]},{"year":2020,"claim":"The circuit-level function of brain OXTR was established by showing that chemogenetic activation of OXTR-expressing lateral septum neurons, which project to hippocampal CA1, rescues social memory deficits in two independent ASD mouse models.","evidence":"hM3Dq DREADD activation in OXTR+ LS neurons, three-chamber and single-field social memory tests, anterograde tracing in VPA-exposed and Nl3R451C knock-in mice","pmids":["33335150"],"confidence":"High","gaps":["Molecular mechanism by which OXTR+ LS→CA1 projection encodes social memory is unknown","Whether endogenous oxytocin release onto these neurons is necessary for normal social memory was not tested"]},{"year":2020,"claim":"The broader OXTR circuit architecture was mapped by generating an Oxtr-ires-Cre knock-in prairie vole and identifying OXTR+ projections from multiple cortical, thalamic, and amygdala regions to nucleus accumbens, including a species-specific ACC→NAcc projection.","evidence":"CRISPR/Cas9 knock-in, retrograde Cre-dependent AAV tracing, and mRNA in situ hybridization in prairie voles","pmids":["33092784"],"confidence":"High","gaps":["Functional significance of individual OXTR+ projections to NAcc not tested","Cross-species conservation of ACC→NAcc pathway not confirmed"]},{"year":2021,"claim":"A second OXTR+ brain circuit was functionally dissected: septal OXTR-expressing neurons project GABAergic fibers to HDB, and optogenetic activation of this projection inhibits HDB neurons and increases anxiety, defining an inhibitory mechanism for OXTR-mediated anxiety.","evidence":"Chemogenetics, optogenetics, tract tracing, and electrophysiology in OXTR-expressing septal neurons of mice","pmids":["34489531"],"confidence":"High","gaps":["Whether oxytocin ligand or tonic OXTR activity drives anxiety in this circuit is not resolved","Interaction with the OXTR+ LS→CA1 social memory circuit not examined"]},{"year":2021,"claim":"How progesterone maintains uterine quiescence was answered by showing PGR-B suppresses Oxtr and Trpc3 while upregulating Plcl2, defining a PGR-B→Oxtr–Plcl2–Trpc3 contractile suppression axis.","evidence":"Transgenic mice overexpressing PGR-A or PGR-B in smooth muscle, uterine RNA-seq, ex vivo and in vivo contractility, CRISPRa for PLCL2/PLCL1","pmids":["33707208"],"confidence":"High","gaps":["Whether PGR-B directly binds the Oxtr promoter or acts indirectly is unknown","Relevance to human preterm labor not validated"]},{"year":2022,"claim":"OXTR's role outside classical neuroendocrine contexts was extended to cancer by defining an OXTR→Gαq/CDC37→ERK5→CCL26 signaling axis in cancer-associated fibroblasts that drives invasion of CCR3+ oral squamous cell carcinoma cells.","evidence":"Co-immunoprecipitation, RNA-seq, ERK5 ablation, CCL26 neutralization, and invasion assays in OSCC patient tissue and cell models","pmids":["36045118"],"confidence":"High","gaps":["Source of oxytocin ligand in the tumor microenvironment not identified","Whether this axis operates in other cancer types is unknown"]},{"year":2022,"claim":"A non-signaling pathological role for OXTR protein was identified: accumulated glycosaminoglycans in MPS I/II patient cells drive OXTR protein aggregation independent of gene expression changes, reversible by enzyme replacement.","evidence":"Immunofluorescence for OXTR aggregates in MPS patient-derived cells, enzyme replacement treatment","pmids":["35537249"],"confidence":"Medium","gaps":["Whether OXTR aggregates impair receptor signaling is not tested","Mechanism of GAG-OXTR interaction (direct binding vs. indirect) not defined"]},{"year":2023,"claim":"OXTR engagement in neuroinflammation was defined by showing that intranasal OXT acts through hippocampal OXTR and an ERK–STAT3 pathway to reduce microglial overactivation and restore cognitive function in sepsis-associated encephalopathy.","evidence":"CLP mouse model, OXTR antagonist L-368,899, RNA-seq pathway analysis, microglial phagocytosis assay, and behavioral testing","pmids":["37648002"],"confidence":"Medium","gaps":["ERK–STAT3 pathway activation shown by transcriptomics, not by direct biochemical assays of phosphorylation","Cell-type specificity of OXTR signaling in hippocampus (neurons vs. microglia) not resolved"]},{"year":null,"claim":"Key unresolved questions include: (1) whether TET1 acts directly at the Oxtr locus or through intermediate regulators, (2) the molecular mechanism by which OXTR+ LS→CA1 projections encode social memory, (3) the source of oxytocin ligand in the tumor microenvironment that activates OXTR on CAFs, and (4) whether distinct OXTR downstream signaling cascades (Gαq/ERK5 vs. nNOS/NO vs. ERK/STAT3) are determined by cell-type-specific coupling partners.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural basis for OXTR coupling selectivity to different Gα proteins","Relative contributions of OXTR signaling vs. OXTR-expressing circuit identity to behavioral phenotypes not disentangled","No reconstitution of any OXTR downstream pathway in a minimal system"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[2,7,9,10,11]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4,12]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,10,11]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[7,8,9]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[1,4,6]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[1,5,13]}],"complexes":[],"partners":["TET1","PGR","PLCL2","TRPC3","NOS1","ERK5","CDC37","GNAQ"],"other_free_text":[]},"mechanistic_narrative":"OXTR is a G protein-coupled receptor for oxytocin that transduces signals through multiple intracellular cascades—including Gαq/CDC37/ERK5, ERK/STAT3, and nNOS/NO/KATP pathways—to regulate uterine contractility, visceral afferent sensitivity, microglial activation, and cancer-associated fibroblast invasion [PMID:36045118, PMID:37648002, PMID:25346204, PMID:22999795]. In the brain, OXTR-expressing neurons form discrete circuits—lateral septum to hippocampal CA1 for social memory and septal GABAergic projections to the horizontal diagonal band of Broca for anxiety modulation—with chemogenetic activation of lateral septum OXTR neurons rescuing social memory deficits in two independent autism spectrum disorder mouse models [PMID:33335150, PMID:34489531, PMID:33092784]. OXTR expression is subject to multilayered epigenetic control: TET1-mediated DNA demethylation maintains Oxtr transcription in the brain, histone H3K9 acetylation marks at the Oxtr promoter confer sex-specific regulation, and progesterone receptor isoform B suppresses Oxtr through an Oxtr–Plcl2–Trpc3 axis to maintain uterine quiescence [PMID:30518695, PMID:30650536, PMID:33707208]. Cis-regulatory variants including rs237895 exhibit allelic expression imbalance in human amygdala, indicating genetically encoded differences in OXTR output in behaviorally relevant brain regions [PMID:20303388]."},"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":377,"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":337,"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":"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":254,"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 America","url":"https://pubmed.ncbi.nlm.nih.gov/20724662","citation_count":197,"is_preprint":false},{"pmid":"22892716","id":"PMC_22892716","title":"Dynamic changes in DNA methylation of stress-associated genes (OXTR, BDNF ) after acute psychosocial stress.","date":"2012","source":"Translational psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/22892716","citation_count":186,"is_preprint":false},{"pmid":"21896752","id":"PMC_21896752","title":"Oxytocin receptor gene (OXTR) is related to psychological resources.","date":"2011","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/21896752","citation_count":182,"is_preprint":false},{"pmid":"25092315","id":"PMC_25092315","title":"Plasma oxytocin concentrations and OXTR polymorphisms predict social impairments in children with and without autism spectrum disorder.","date":"2014","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/25092315","citation_count":178,"is_preprint":false},{"pmid":"19461999","id":"PMC_19461999","title":"The oxytocin receptor (OXTR) contributes to prosocial fund allocations in the dictator game and the social value orientations task.","date":"2009","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/19461999","citation_count":164,"is_preprint":false},{"pmid":"20094064","id":"PMC_20094064","title":"Association of the oxytocin receptor (OXTR) gene polymorphisms with autism spectrum disorder (ASD) in the Japanese 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psychology","url":"https://pubmed.ncbi.nlm.nih.gov/31282733","citation_count":13,"is_preprint":false},{"pmid":"32060678","id":"PMC_32060678","title":"The Association of Oxytocin Receptor Gene (OXTR) Polymorphisms with Antisocial Behavior: A Meta-analysis.","date":"2020","source":"Behavior genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32060678","citation_count":12,"is_preprint":false},{"pmid":"27867940","id":"PMC_27867940","title":"Oxytocin Receptor (OXTR) Methylation and Cognition in Psychotic Disorders.","date":"2016","source":"Molecular neuropsychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/27867940","citation_count":12,"is_preprint":false},{"pmid":"35537249","id":"PMC_35537249","title":"Changes in expression of signal transduction-related genes, and formation of aggregates of GPER1 and OXTR receptors in mucopolysaccharidosis cells.","date":"2022","source":"European journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/35537249","citation_count":12,"is_preprint":false},{"pmid":"28442360","id":"PMC_28442360","title":"The OXTR gene, implicit learning and social processing: Does empathy evolve from perceptual skills for details?","date":"2017","source":"Behavioural brain research","url":"https://pubmed.ncbi.nlm.nih.gov/28442360","citation_count":11,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47044,"output_tokens":4266,"usd":0.102561},"stage2":{"model":"claude-opus-4-6","input_tokens":7726,"output_tokens":3458,"usd":0.18762},"total_usd":0.290181,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"OTR and OXT transcripts are expressed in enteric neurons and intestinal epithelium, with OTR immunoreactivity co-localizing 100% with the neural marker Hu in postnatal day 3 myenteric plexus neurons; intrinsic primary afferent neurons express OTR, and OTR is present at enterocyte adherens junctions as shown by immunoelectron microscopy, suggesting a role for OT/OTR signaling in ENS development and visceral sensory modulation.\",\n      \"method\": \"RT-PCR, immunofluorescence co-localization, immunoelectron microscopy, subcellular fractionation\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiments with multiple orthogonal methods in a single study\",\n      \"pmids\": [\"19003903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Overexpression of oxytocin receptor (OTR) protein in myometrial smooth muscle cells (MSMCs) from adenomyosis patients correlates with increased uterine contractile amplitude; histone deacetylase inhibitor TSA and andrographolide dose-dependently inhibit OTR expression in MSMCs, implicating epigenetic regulation of OXTR in uterine contractility.\",\n      \"method\": \"Western blot quantification of OTR in cultured MSMCs, in vitro contractility assay, pharmacological inhibition (TSA, andrographolide)\",\n      \"journal\": \"Fertility and sterility\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional assay linking OXTR expression to contractility with pharmacological modulation\",\n      \"pmids\": [\"22999795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Oxytocin down-regulates mesenteric afferent sensitivity via an OTR/nNOS/NO/KATP pathway: OTR co-localizes with nNOS in the longitudinal muscle myenteric plexus, and the inhibitory effect of oxytocin on bradykinin- or distention-evoked afferent discharge is blocked by the NOS inhibitors L-NAME and NPLA, and by KATP channel blocker glibenclamide.\",\n      \"method\": \"In vitro mesenteric afferent discharge recording, immunofluorescence co-localization, pharmacological dissection with NOS inhibitors and KATP blockers\",\n      \"journal\": \"Neurogastroenterology and motility\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional in vitro assay with mechanistic pharmacological dissection and direct co-localization evidence\",\n      \"pmids\": [\"25346204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Positive selection footprints are detected at OXTR amino acid sites across primates, with several OXTR changes promoting gain or loss of putative phosphorylation sites that may affect receptor internalization and desensitization; intramolecular and intermolecular coevolutionary processes between OXT and OXTR were detected.\",\n      \"method\": \"Phylogenetic analysis of OXT and OXTR sequences from 29 primate species, molecular dynamic simulations, coevolutionary analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — computational and comparative genomic analysis with structural modeling; no direct experimental validation of phosphorylation consequences\",\n      \"pmids\": [\"25535371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Myometrial contractile activity during labor upregulates OXTR expression approximately 3.2–6.9-fold in placental trophoblast cells obtained from the maternal surface, compared to cesarean section without uterine contractions, suggesting a mechanosensitive positive-feedback regulation of OXTR in labor.\",\n      \"method\": \"Immunohistochemistry with morphometry, primary trophoblast cell culture, comparison of vaginal delivery vs. cesarean section placentae\",\n      \"journal\": \"BMC pregnancy and childbirth\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — controlled human tissue comparison with quantitative protein measurement in primary cells\",\n      \"pmids\": [\"26377392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TET1 deficiency causes hypermethylation of CpG islands in Oxtr during early development, reducing select Oxtr mRNA isoforms in the brain of Tet1Δe4-/- mice; this is associated with impaired maternal care, social behavior, and synaptic responses to oxytocin stimulation, establishing TET1 as an epigenetic writer that maintains Oxtr expression by preventing DNA hypermethylation.\",\n      \"method\": \"Tet1 mutant mouse generation (CRISPR/Cas9 deletion of exon 4), RT-PCR for mRNA isoforms, bisulfite sequencing of CpG islands, behavioral assays, synaptic electrophysiology\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — genetic loss-of-function in vivo with multiple orthogonal methods linking TET1 to OXTR methylation and functional consequences\",\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 while increasing Plcl2, establishing an Oxtr-Plcl2-Trpc3 pathway downstream of PGR-B; both PLCL2 and PLCL1 attenuate uterine muscle cell contraction in a CRISPRa-based assay, confirming this as a functional suppressive pathway.\",\n      \"method\": \"Transgenic mouse models (PGR-A or PGR-B overexpression in smooth muscle), uterine RNA sequencing, ex vivo and in vivo contractility assays, CRISPRa functional assay for PLCL2/PLCL1\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vivo genetic model with transcriptomic identification of pathway and orthogonal CRISPRa functional validation\",\n      \"pmids\": [\"33707208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Chemogenetic activation of septal OXTr-expressing neurons induces anxiety-like but not depressive-like behavior; these neurons project GABAergic fibers to the horizontal diagonal band of Broca (HDB), and optogenetic stimulation of septal OXTr projections to HDB inactivates HDB neurons, revealing an inhibitory circuit mechanism by which OXTR-expressing septal neurons increase anxiety.\",\n      \"method\": \"Chemogenetics (DREADDs), optogenetics, anterograde tract tracing, electrophysiology, behavioral assays in mice\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cell-type-specific circuit dissection with chemogenetics and optogenetics in defined OXTR-expressing neurons\",\n      \"pmids\": [\"34489531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Using Oxtr-ires-Cre knock-in prairie voles, OXTR-expressing neurons projecting to the nucleus accumbens (NAcc) were identified in multiple brain regions including anterior olfactory nucleus, PFC, ACC, insular cortex, paraventricular thalamus, basolateral amygdala, and cortical amygdaloid areas, establishing a detailed OXTR neural circuit map in the prairie vole, including a species-specific ACC→NAcc OXTR projection.\",\n      \"method\": \"CRISPR/Cas9 Oxtr-ires-Cre knock-in generation, retrograde Cre-dependent AAV tracing, fluorescence visualization, mRNA co-localization by in situ hybridization\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — genetically validated Cre knock-in with circuit-level retrograde tracing in a mammalian ortholog model\",\n      \"pmids\": [\"33092784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Selective chemogenetic activation of OXTR-expressing neurons in the lateral septum (LS) rescues impaired social memory in both environmentally- (valproic acid) and genetically- (Nl3R451C knock-in) induced ASD mouse models; LS OXTR+ neurons are activated by social stimuli and project to the CA1 region of the hippocampus.\",\n      \"method\": \"Chemogenetics (hM3Dq DREADDs) in OXTR+ LS neurons, three-chamber social test, single-field social memory test, anterograde projection tracing in ASD mouse models\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cell-type-specific circuit intervention with two independent ASD models and behavioral rescue\",\n      \"pmids\": [\"33335150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In oral squamous cell carcinoma, OXTRHigh cancer-associated fibroblasts (CAFs) activate nuclear ERK5 transcriptional signaling via Gαq and CDC37, maintaining high levels of OXTR and CCL26; CCL26 drives invasion of CCR3+ tumor cells, and ERK5 ablation reprograms the pro-invasive phenotype, establishing an OXTR→Gαq/CDC37→ERK5→CCL26 signaling axis in CAFs.\",\n      \"method\": \"Co-immunoprecipitation, RNA-seq, ERK5 ablation, CCL26 neutralization, invasion assays, OSCC patient tissue analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mechanistic pathway defined with multiple orthogonal methods including co-IP, KO, and functional rescue\",\n      \"pmids\": [\"36045118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In a sepsis-associated encephalopathy mouse model, hippocampal OXTR increases after CLP surgery; OXTR antagonist L-368,899 blocks intranasal OXT-mediated neuroprotection, and RNA sequencing identifies the OXTR-ERK-STAT3 signaling pathway as the mechanism by which OXT reduces microglial overactivation, restores synaptic function, and improves cognitive outcomes.\",\n      \"method\": \"CLP mouse model, intranasal OXT administration, OXTR antagonist injection (intraperitoneal and hippocampal CA1), RNA sequencing, microglial phagocytosis assay, cytokine measurement, behavioral assays\",\n      \"journal\": \"Brain, behavior, and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological receptor blockade with transcriptomic pathway identification and multiple functional readouts in vivo\",\n      \"pmids\": [\"37648002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OXTR protein forms aggregates in MPS I and MPS II patient-derived cells due to interactions with accumulated glycosaminoglycans (GAGs); these aggregates disappear upon treatment with the deficient enzymes that degrade GAGs, indicating that GAG accumulation drives OXTR aggregate formation independent of changes in OXTR gene expression or protein levels.\",\n      \"method\": \"Transcriptomic analysis, immunofluorescence for OXTR aggregates in MPS patient cells, enzyme replacement treatment, correlation analysis of expression vs. aggregate formation\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct cell biological experiment with pharmacological rescue demonstrating GAG-OXTR interaction\",\n      \"pmids\": [\"35537249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Maternal high fat diet-induced obesity increases Oxtr mRNA ~2-fold in male but not female offspring hippocampus at gestational day 17.5, associated with increased binding of the active histone mark H3K9Ac at the Oxtr transcriptional start site, demonstrating sex-specific epigenetic upregulation of Oxtr by maternal obesity.\",\n      \"method\": \"RT-PCR for Oxtr mRNA, chromatin immunoprecipitation (ChIP) for H3K9Ac at Oxtr TSS in offspring hippocampus, sex-stratified analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct ChIP experiment linking histone modification to Oxtr transcription in a defined biological context\",\n      \"pmids\": [\"30650536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Perinatal bisphenol A (BPA) exposure eliminates sex differences in OTR expression in three hypothalamic regions of juvenile rats, with male OTR expression being more susceptible, as measured by receptor binding; this demonstrates that an endocrine-disrupting chemical can alter OTR expression in a sex- and brain-region-specific manner.\",\n      \"method\": \"Gavage BPA exposure spanning gestation and lactation in rats, OTR receptor binding assay across brain regions in juvenile offspring\",\n      \"journal\": \"Neurotoxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — controlled in vivo exposure study with quantitative receptor binding across multiple brain regions and sex comparisons\",\n      \"pmids\": [\"31251963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Allelic expression imbalance (AEI) assays in lymphoblast cell lines and amygdala tissue identify cis-acting OXTR variants: rs237897 and rs237895 are associated with differential allelic abundance in lymphoblasts, and rs237895 also shows AEI in amygdala, while rs13316193 weakly correlates with total amygdala OXTR gene expression.\",\n      \"method\": \"Allelic expression imbalance (AEI) assay in lymphoblast cell lines and human amygdala tissue, correlation of genotype with RNA levels\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct molecular assay of cis-regulatory effects on OXTR expression in relevant human tissue\",\n      \"pmids\": [\"20303388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In a bioinformatic analysis, the rs1042778 G allele of OXTR creates a binding site for the transcription factor MAZ; when the T allele is present, MAZ cannot bind, suggesting lower transcriptional activity of the OXTR gene as a functional consequence of this SNP.\",\n      \"method\": \"Bioinformatic transcription factor binding site prediction for rs1042778 alleles\",\n      \"journal\": \"Journal of molecular neuroscience : MN\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational prediction only, not experimentally validated\",\n      \"pmids\": [\"29858823\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"OXTR is a G protein-coupled receptor that transduces oxytocin signaling through multiple downstream pathways (including Gαq/ERK5/STAT3 and nNOS/NO/KATP) in diverse tissues including brain circuits (lateral septum→hippocampus, septal GABAergic projections to HDB), myometrium, enteric neurons, and cancer-associated fibroblasts; its expression is epigenetically regulated by TET1-mediated DNA demethylation and histone acetylation, and by upstream transcriptional regulators such as progesterone receptor isoform B (PGR-B) which suppresses OXTR to maintain uterine quiescence via an Oxtr-Plcl2-Trpc3 axis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"OXTR is a G protein-coupled receptor for oxytocin that transduces signals through multiple intracellular cascades—including Gαq/CDC37/ERK5, ERK/STAT3, and nNOS/NO/KATP pathways—to regulate uterine contractility, visceral afferent sensitivity, microglial activation, and cancer-associated fibroblast invasion [PMID:36045118, PMID:37648002, PMID:25346204, PMID:22999795]. In the brain, OXTR-expressing neurons form discrete circuits—lateral septum to hippocampal CA1 for social memory and septal GABAergic projections to the horizontal diagonal band of Broca for anxiety modulation—with chemogenetic activation of lateral septum OXTR neurons rescuing social memory deficits in two independent autism spectrum disorder mouse models [PMID:33335150, PMID:34489531, PMID:33092784]. OXTR expression is subject to multilayered epigenetic control: TET1-mediated DNA demethylation maintains Oxtr transcription in the brain, histone H3K9 acetylation marks at the Oxtr promoter confer sex-specific regulation, and progesterone receptor isoform B suppresses Oxtr through an Oxtr–Plcl2–Trpc3 axis to maintain uterine quiescence [PMID:30518695, PMID:30650536, PMID:33707208]. Cis-regulatory variants including rs237895 exhibit allelic expression imbalance in human amygdala, indicating genetically encoded differences in OXTR output in behaviorally relevant brain regions [PMID:20303388].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"The question of whether OXTR operates outside classic reproductive and central circuits was addressed by demonstrating OTR expression in enteric neurons and intestinal epithelium, expanding OXTR's functional territory to the enteric nervous system.\",\n      \"evidence\": \"RT-PCR, immunofluorescence co-localization with neural marker Hu, and immunoelectron microscopy in mouse postnatal myenteric plexus\",\n      \"pmids\": [\"19003903\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of OTR at enterocyte adherens junctions not tested\", \"No loss-of-function study in enteric neurons\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Whether common OXTR variants have cis-regulatory effects on gene expression was addressed by identifying allelic expression imbalance at rs237895 in human amygdala, establishing that genetic variation can directly modulate OXTR output in behaviorally relevant tissue.\",\n      \"evidence\": \"Allelic expression imbalance assay in human lymphoblast cell lines and amygdala tissue\",\n      \"pmids\": [\"20303388\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal variant not pinpointed\", \"Functional consequence of differential OXTR expression from these alleles not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Whether OXTR expression is epigenetically modifiable was demonstrated by showing that histone deacetylase inhibition suppresses OTR protein in myometrial smooth muscle cells, linking OXTR to histone acetylation-dependent regulation and uterine contractility.\",\n      \"evidence\": \"Western blot and contractility assay with TSA and andrographolide treatment of cultured MSMCs from adenomyosis patients\",\n      \"pmids\": [\"22999795\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific histone marks and genomic loci not identified\", \"No in vivo validation of HDAC inhibitor effects on OXTR\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"How OXTR modulates visceral sensory signaling was resolved by defining an OTR/nNOS/NO/KATP pathway through which oxytocin suppresses mesenteric afferent firing, establishing a complete signaling cascade from receptor to effector channel.\",\n      \"evidence\": \"In vitro mesenteric afferent discharge recording with sequential pharmacological blockade of NOS and KATP channels, plus immunofluorescence co-localization of OTR and nNOS\",\n      \"pmids\": [\"25346204\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Pathway not tested in vivo\", \"Whether this cascade operates in other OXTR-expressing peripheral neurons is unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"How OXTR expression is maintained in the brain was established by showing that TET1 prevents CpG island hypermethylation at the Oxtr locus; loss of TET1 reduces Oxtr mRNA isoforms and impairs maternal behavior and synaptic oxytocin responsiveness.\",\n      \"evidence\": \"Tet1 exon 4-deleted mice (CRISPR/Cas9), bisulfite sequencing, RT-PCR, behavioral assays, and synaptic electrophysiology\",\n      \"pmids\": [\"30518695\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TET1 acts directly at Oxtr or via intermediate demethylation targets is not resolved\", \"Rescue by Oxtr re-expression not performed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Whether OXTR is subject to sex-specific epigenetic regulation was addressed by demonstrating increased H3K9Ac at the Oxtr promoter in male but not female offspring hippocampus following maternal high-fat diet, revealing a sex-dimorphic histone-based mechanism.\",\n      \"evidence\": \"ChIP for H3K9Ac at Oxtr TSS and RT-PCR in sex-stratified offspring hippocampi from obese dams\",\n      \"pmids\": [\"30650536\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal link between H3K9Ac enrichment and Oxtr mRNA increase not established by loss-of-function\", \"Downstream behavioral consequences not measured\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The circuit-level function of brain OXTR was established by showing that chemogenetic activation of OXTR-expressing lateral septum neurons, which project to hippocampal CA1, rescues social memory deficits in two independent ASD mouse models.\",\n      \"evidence\": \"hM3Dq DREADD activation in OXTR+ LS neurons, three-chamber and single-field social memory tests, anterograde tracing in VPA-exposed and Nl3R451C knock-in mice\",\n      \"pmids\": [\"33335150\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which OXTR+ LS→CA1 projection encodes social memory is unknown\", \"Whether endogenous oxytocin release onto these neurons is necessary for normal social memory was not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The broader OXTR circuit architecture was mapped by generating an Oxtr-ires-Cre knock-in prairie vole and identifying OXTR+ projections from multiple cortical, thalamic, and amygdala regions to nucleus accumbens, including a species-specific ACC→NAcc projection.\",\n      \"evidence\": \"CRISPR/Cas9 knock-in, retrograde Cre-dependent AAV tracing, and mRNA in situ hybridization in prairie voles\",\n      \"pmids\": [\"33092784\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional significance of individual OXTR+ projections to NAcc not tested\", \"Cross-species conservation of ACC→NAcc pathway not confirmed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A second OXTR+ brain circuit was functionally dissected: septal OXTR-expressing neurons project GABAergic fibers to HDB, and optogenetic activation of this projection inhibits HDB neurons and increases anxiety, defining an inhibitory mechanism for OXTR-mediated anxiety.\",\n      \"evidence\": \"Chemogenetics, optogenetics, tract tracing, and electrophysiology in OXTR-expressing septal neurons of mice\",\n      \"pmids\": [\"34489531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether oxytocin ligand or tonic OXTR activity drives anxiety in this circuit is not resolved\", \"Interaction with the OXTR+ LS→CA1 social memory circuit not examined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"How progesterone maintains uterine quiescence was answered by showing PGR-B suppresses Oxtr and Trpc3 while upregulating Plcl2, defining a PGR-B→Oxtr–Plcl2–Trpc3 contractile suppression axis.\",\n      \"evidence\": \"Transgenic mice overexpressing PGR-A or PGR-B in smooth muscle, uterine RNA-seq, ex vivo and in vivo contractility, CRISPRa for PLCL2/PLCL1\",\n      \"pmids\": [\"33707208\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PGR-B directly binds the Oxtr promoter or acts indirectly is unknown\", \"Relevance to human preterm labor not validated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"OXTR's role outside classical neuroendocrine contexts was extended to cancer by defining an OXTR→Gαq/CDC37→ERK5→CCL26 signaling axis in cancer-associated fibroblasts that drives invasion of CCR3+ oral squamous cell carcinoma cells.\",\n      \"evidence\": \"Co-immunoprecipitation, RNA-seq, ERK5 ablation, CCL26 neutralization, and invasion assays in OSCC patient tissue and cell models\",\n      \"pmids\": [\"36045118\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Source of oxytocin ligand in the tumor microenvironment not identified\", \"Whether this axis operates in other cancer types is unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A non-signaling pathological role for OXTR protein was identified: accumulated glycosaminoglycans in MPS I/II patient cells drive OXTR protein aggregation independent of gene expression changes, reversible by enzyme replacement.\",\n      \"evidence\": \"Immunofluorescence for OXTR aggregates in MPS patient-derived cells, enzyme replacement treatment\",\n      \"pmids\": [\"35537249\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether OXTR aggregates impair receptor signaling is not tested\", \"Mechanism of GAG-OXTR interaction (direct binding vs. indirect) not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"OXTR engagement in neuroinflammation was defined by showing that intranasal OXT acts through hippocampal OXTR and an ERK–STAT3 pathway to reduce microglial overactivation and restore cognitive function in sepsis-associated encephalopathy.\",\n      \"evidence\": \"CLP mouse model, OXTR antagonist L-368,899, RNA-seq pathway analysis, microglial phagocytosis assay, and behavioral testing\",\n      \"pmids\": [\"37648002\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ERK–STAT3 pathway activation shown by transcriptomics, not by direct biochemical assays of phosphorylation\", \"Cell-type specificity of OXTR signaling in hippocampus (neurons vs. microglia) not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: (1) whether TET1 acts directly at the Oxtr locus or through intermediate regulators, (2) the molecular mechanism by which OXTR+ LS→CA1 projections encode social memory, (3) the source of oxytocin ligand in the tumor microenvironment that activates OXTR on CAFs, and (4) whether distinct OXTR downstream signaling cascades (Gαq/ERK5 vs. nNOS/NO vs. ERK/STAT3) are determined by cell-type-specific coupling partners.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural basis for OXTR coupling selectivity to different Gα proteins\", \"Relative contributions of OXTR signaling vs. OXTR-expressing circuit identity to behavioral phenotypes not disentangled\", \"No reconstitution of any OXTR downstream pathway in a minimal system\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [2, 7, 9, 10, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 12]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 10, 11]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [7, 8, 9]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [1, 4, 6]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [1, 5, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"TET1\",\n      \"PGR\",\n      \"PLCL2\",\n      \"TRPC3\",\n      \"NOS1\",\n      \"ERK5\",\n      \"CDC37\",\n      \"GNAQ\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}