{"gene":"NR2C2","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":1994,"finding":"NR2C2 (TR4) was cloned from human and rat hypothalamus, prostate, and testis cDNA libraries and identified as a member of the steroid receptor superfamily closely related to TR2, with differential tissue expression suggesting a role in transcriptional regulation in neurons (granule cells of hippocampus and cerebellum).","method":"cDNA library screening, sequence analysis, tissue expression profiling","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — original cloning and localization paper, single lab","pmids":["8016112"],"is_preprint":false},{"year":2002,"finding":"NR2C2 (TR4) forms a heterodimer with TR2 that constitutes the core of the DRED repressor complex (~540 kDa), which binds DR1 sites in the human embryonic (ε-) and fetal (γ-) globin gene promoters to repress their transcription in definitive erythroid cells; one HPFH mutation in a DR1 site reduces TR2/TR4 binding in vitro.","method":"Co-immunoprecipitation, EMSA, size-exclusion chromatography, transgenic mouse overexpression, in vitro binding assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, EMSA, transgenic mouse phenotype, multiple orthogonal methods","pmids":["12093744"],"is_preprint":false},{"year":2002,"finding":"NR2C2 (TR4) suppresses estrogen receptor (ER)-mediated transactivation through direct protein-protein interaction that inhibits ER homodimerization and prevents ER binding to the estrogen response element, thereby suppressing ER target genes (cyclin D1, pS2) and ER-mediated cell proliferation in MCF-7 cells.","method":"EMSA, GST pull-down, stable transfection, cell proliferation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro binding assay with mutagenesis context, GST pull-down, functional cell assay","pmids":["11844790"],"is_preprint":false},{"year":2004,"finding":"TIP27, a novel 27 kDa zinc-finger protein, interacts specifically with the ligand-binding domain (LBD) of NR2C2 (TR4) via its TAK1-interaction domain (residues Asp39–Lys79) and functions as a strong repressor of TR4-mediated transactivation without inhibiting TR4 homodimerization or DR1 binding, potentially by blocking coactivator recruitment.","method":"Yeast two-hybrid, mammalian two-hybrid, pull-down assay, confocal co-localization, luciferase reporter assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Y2H, pull-down, co-localization, reporter), single lab","pmids":["15302918"],"is_preprint":false},{"year":2007,"finding":"NR2C2 (TR4) directly transactivates the PEPCK promoter by binding to a TR4 response element (TR4RE) at −451 to −439 in the promoter, thereby promoting gluconeogenesis; TR4 knockout mice show reduced PEPCK expression and impaired gluconeogenesis.","method":"Luciferase reporter assay, EMSA, chromatin immunoprecipitation, siRNA knockdown, TR4 knockout mice, glucose production assay","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP, EMSA, KO mouse, in vitro + in vivo concordant results","pmids":["17827404"],"is_preprint":false},{"year":2007,"finding":"NR2C2 (TR4) and TR2 directly repress Gata1/GATA1 transcription in murine and human erythroid progenitor cells by binding an evolutionarily conserved DR element within the GATA1 hematopoietic enhancer (G1HE); mutation of this DR element elevates Gata1 promoter activity and reduces responsiveness to TR2/TR4.","method":"Transgenic mouse overexpression, TR2/TR4 germline-null mice, shRNA knockdown in CD34+ progenitors, EMSA, ChIP, luciferase reporter","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 — multiple genetic models (GOF transgenic, LOF knockout, shRNA), ChIP, EMSA, mutagenesis","pmids":["17974920"],"is_preprint":false},{"year":2010,"finding":"The crystal structure of the ligand-free TR4 ligand-binding domain reveals an autorepressed conformation in which the ligand binding pocket is filled by helix 10 and the cofactor binding site is occupied by the AF-2 helix; retinol and retinoic acid promote TR4 to recruit coactivators and activate transcription, identifying TR4 as a ligand-regulated nuclear receptor.","method":"X-ray crystallography, coactivator recruitment assay, transcriptional reporter assay, mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional mutagenesis validation","pmids":["21068381"],"is_preprint":false},{"year":2010,"finding":"Genome-wide ChIP-seq identified TR4 (NR2C2) binding sites across four human cell types, revealing that <30% contain the canonical DR1 motif; a subset of TR4 binding sites overlaps with ETS factor ELK4 binding sites lacking DR1 elements, suggesting TR4 can be recruited to chromatin via interaction with ETS factors.","method":"ChIP-seq in four human cell lines, motif analysis, co-localization with ELK4 ChIP-seq","journal":"BMC genomics","confidence":"Medium","confidence_rationale":"Tier 2 — genome-wide ChIP-seq with bioinformatics; protein interaction inferred, not directly demonstrated","pmids":["21126370"],"is_preprint":false},{"year":2013,"finding":"NR2C2 (TR4) is overexpressed in corticotroph tumors and transcriptionally activates proopiomelanocortin (POMC) through a direct repeat 1 (DR1) response element in the POMC promoter; MAPK-mediated phosphorylation of TR4 enhances this transactivation, and TR4 knockdown decreases circulating ACTH and corticosterone in vivo.","method":"Luciferase reporter, ChIP, overexpression/knockdown in cell lines, in vivo mouse tumor model, MAPK phosphorylation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — ChIP, reporter, in vivo mouse model, multiple orthogonal methods","pmids":["23653479"],"is_preprint":false},{"year":2017,"finding":"SIRT7-mediated deacetylation of DDB1 at Lys1121 attenuates the CUL4B/DDB1/DCAF1 E3 ubiquitin ligase complex by reducing DDB1-DCAF1 binding, thereby stabilizing NR2C2 (TR4) protein and increasing expression of TR4 target genes (Cd36, Cidea, Cidec, Pparg1).","method":"Co-immunoprecipitation, mutagenesis (K1121R), overexpression, western blot, qPCR","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP and mutagenesis in single lab; functional readout on TR4 targets","pmids":["28623141"],"is_preprint":false},{"year":2018,"finding":"NR2C2 (TR4) transcriptionally activates the RNA-binding protein QKI, which increases circZEB1 levels; circZEB1 sponges miR-141-3p to increase ZEB1 expression, thereby promoting prostate cancer radioresistance via the TR4-QKI-circZEB1-miR-141-3p-ZEB1 axis.","method":"ChIP, luciferase reporter, shRNA knockdown, in vivo mouse model, qPCR","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2–3 — ChIP and functional rescue, single lab","pmids":["32768524"],"is_preprint":false},{"year":2018,"finding":"NR2C2 (TR4) directly suppresses HCC cell invasion by transcriptionally downregulating EphA2 expression via direct binding to TR4 response elements (TR4REs) in the 5' EphA2 promoter, as confirmed by in vivo orthotopic xenograft experiments.","method":"ChIP, luciferase reporter, siRNA knockdown, migration/invasion assay, in vivo orthotopic mouse model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP with functional rescue, in vivo confirmation, single lab","pmids":["29449527"],"is_preprint":false},{"year":2019,"finding":"NR2C2 (TR4) transcriptionally activates lncTASR (ENST00000600671.1), which stabilizes AXL mRNA to increase AXL protein expression and confer sunitinib resistance in renal cell carcinoma; targeting TR4 with tretinoin or shRNA restores sunitinib sensitivity.","method":"ChIP, luciferase reporter, shRNA knockdown, qPCR, western blot, in vivo mouse xenograft model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 — ChIP and in vivo functional data, single lab","pmids":["31501521"],"is_preprint":false},{"year":2018,"finding":"NR2C2 (TR4) is a direct target of miR-627-5p; lncRNA UCA1 acts as a miR-627-5p sponge to upregulate NR2C2 expression, and an upstream open reading frame (uORF) in the NR2C2 5'UTR negatively regulates NR2C2 protein production, forming a feedback regulatory loop controlling glioma cell malignancy.","method":"Dual luciferase reporter, ChIP, western blot, qPCR, shRNA/overexpression, in vivo xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2–3 — reporter assay validation and ChIP; uORF mechanism partially characterized","pmids":["30518750"],"is_preprint":false}],"current_model":"NR2C2 (TR4) is a ligand-regulated nuclear receptor (activated by retinoids and fatty acid metabolites) that, as a TR2/TR4 heterodimer, binds DR1 elements in target gene promoters to repress embryonic/fetal globin and Gata1 transcription in erythroid cells; it also transactivates PEPCK (gluconeogenesis) and POMC (ACTH secretion), suppresses estrogen receptor signaling via direct protein-protein interaction, and is regulated post-translationally by MAPK-mediated phosphorylation and by CUL4B/DDB1/DCAF1-mediated ubiquitin-dependent degradation."},"narrative":{"teleology":[{"year":1994,"claim":"Cloning of NR2C2 (TR4) established the existence of a novel nuclear receptor closely related to TR2 with enriched expression in brain and reproductive tissues, raising the question of its transcriptional targets and functions.","evidence":"cDNA library screening from hypothalamus, prostate, and testis; tissue expression profiling","pmids":["8016112"],"confidence":"Medium","gaps":["No target genes or DNA-binding specificity identified","Ligand unknown","Single-lab cloning without independent confirmation at the time"]},{"year":2002,"claim":"Identification of the TR2/TR4 (DRED) heterodimer as the repressor of embryonic and fetal globin genes via DR1 elements provided the first functional role for NR2C2 in erythroid gene regulation and connected it to hereditary persistence of fetal hemoglobin pathogenesis.","evidence":"Co-IP, EMSA, size-exclusion chromatography, transgenic mouse overexpression","pmids":["12093744"],"confidence":"High","gaps":["Corepressor components of the ~540 kDa DRED complex not identified","In vivo loss-of-function in erythroid lineage not yet shown"]},{"year":2002,"claim":"Demonstration that TR4 suppresses estrogen receptor transactivation through direct protein–protein interaction that blocks ER dimerization revealed a non-DNA-binding mechanism by which TR4 modulates hormone signaling.","evidence":"GST pull-down, EMSA, stable transfection in MCF-7 cells, proliferation assay","pmids":["11844790"],"confidence":"High","gaps":["Physiological relevance in vivo not established","Stoichiometry and structural basis of TR4–ER interaction unknown"]},{"year":2004,"claim":"Discovery of the corepressor TIP27 as a direct LBD-interacting partner that represses TR4 transactivation without disrupting DNA binding indicated that TR4 activity is modulated by cofactor competition at the LBD surface.","evidence":"Yeast two-hybrid, mammalian two-hybrid, pull-down, confocal co-localization, reporter assay","pmids":["15302918"],"confidence":"High","gaps":["Endogenous stoichiometry of TIP27–TR4 complex unknown","No in vivo loss-of-function for TIP27"]},{"year":2007,"claim":"TR4 was shown to directly activate PEPCK transcription and repress GATA1 transcription via cognate DR elements, establishing it as a bifunctional regulator of both metabolic (gluconeogenesis) and hematopoietic gene programs, validated in knockout mice.","evidence":"ChIP, EMSA, luciferase reporter, siRNA, TR4 KO mice, TR2/TR4-null and GOF transgenic mice, shRNA in CD34+ cells","pmids":["17827404","17974920"],"confidence":"High","gaps":["How context-dependent switching between activation and repression is determined remains unclear","Genome-wide target repertoire not yet defined"]},{"year":2010,"claim":"The crystal structure of the TR4 LBD revealed an autorepressed conformation with an occluded coactivator groove, and retinol/retinoic acid were identified as ligands that relieve autoinhibition and promote coactivator recruitment, resolving the long-standing question of whether TR4 is ligand-regulated.","evidence":"X-ray crystallography, coactivator recruitment assay, transcriptional reporter, mutagenesis","pmids":["21068381"],"confidence":"High","gaps":["Physiological retinoid concentrations required for activation in vivo not determined","No co-crystal structure with ligand"]},{"year":2010,"claim":"Genome-wide ChIP-seq revealed that the majority of TR4 binding sites lack canonical DR1 motifs and overlap with ETS factor binding sites, suggesting alternative chromatin recruitment mechanisms beyond direct DNA recognition.","evidence":"ChIP-seq in four human cell lines with motif and co-occupancy analysis","pmids":["21126370"],"confidence":"Medium","gaps":["Direct physical interaction between TR4 and ETS factors not demonstrated","Functional significance of non-DR1 sites not validated"]},{"year":2013,"claim":"TR4 was found to activate POMC transcription via a DR1 element and to be potentiated by MAPK-mediated phosphorylation, linking TR4 to HPA-axis regulation and establishing phosphorylation as a post-translational activating mechanism.","evidence":"ChIP, luciferase reporter, overexpression/knockdown in corticotroph cells, in vivo mouse tumor model, MAPK phosphorylation assay","pmids":["23653479"],"confidence":"High","gaps":["Specific phosphorylation sites and responsible MAPK family member not fully characterized","Relevance to normal pituitary physiology versus tumor context unclear"]},{"year":2017,"claim":"Identification of CUL4B/DDB1/DCAF1 as the E3 ligase targeting TR4 for ubiquitin-dependent degradation, modulated by SIRT7-mediated DDB1 deacetylation, established a proteostatic regulatory layer for TR4 protein levels.","evidence":"Co-IP, K1121R mutagenesis of DDB1, western blot, qPCR of TR4 target genes","pmids":["28623141"],"confidence":"Medium","gaps":["Direct ubiquitination of TR4 not demonstrated with in vitro reconstitution","Specific ubiquitinated lysine residues on TR4 not mapped"]},{"year":2018,"claim":"Multiple cancer-context studies showed that TR4 transcriptionally controls diverse downstream effectors (EphA2 in HCC, QKI/circZEB1 axis in prostate cancer, lncTASR/AXL in RCC), implicating TR4 in tumor invasion and therapy resistance through cell-type-specific target gene programs.","evidence":"ChIP, luciferase reporter, shRNA/siRNA knockdown, in vivo xenograft and orthotopic models across multiple cancer types","pmids":["29449527","32768524","31501521"],"confidence":"Medium","gaps":["Mechanisms determining cell-type-specific target selection are unknown","Therapeutic targeting of TR4 in cancer not clinically validated","Findings largely from single-lab studies"]},{"year":null,"claim":"Key unresolved questions include the full spectrum of physiological TR4 ligands, the structural basis of TR2/TR4 heterodimerization and DRED complex assembly, and the mechanisms governing context-dependent switching between transcriptional activation and repression.","evidence":"","pmids":[],"confidence":"High","gaps":["No co-crystal structure of TR4 LBD with retinoid ligand","DRED complex corepressor subunit identities unknown","No systematic loss-of-function studies in adult tissues beyond erythroid and metabolic contexts"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,4,5,7,8]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,4,5,6,8,10,11,12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,3,6]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,8]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[4]}],"complexes":["DRED (TR2/TR4 repressor complex)"],"partners":["NR2C1","ESR1","TIP27","DDB1","CUL4B","DCAF1","ELK4"],"other_free_text":[]},"mechanistic_narrative":"NR2C2 (TR4) is a ligand-regulated orphan nuclear receptor that functions as a transcriptional activator and repressor across diverse biological processes including erythropoiesis, gluconeogenesis, and neuroendocrine signaling. As a heterodimer with TR2, it constitutes the DRED repressor complex that binds DR1 elements in embryonic and fetal globin gene promoters and the GATA1 hematopoietic enhancer to silence these genes in definitive erythroid cells [PMID:12093744, PMID:17974920]. The ligand-binding domain adopts an autorepressed conformation in the absence of ligand, with retinol and retinoic acid promoting coactivator recruitment and transcriptional activation of target genes including PEPCK and POMC [PMID:21068381, PMID:17827404, PMID:23653479]. TR4 activity is modulated by MAPK-mediated phosphorylation, CUL4B/DDB1/DCAF1-dependent ubiquitin-mediated degradation, protein–protein interaction with estrogen receptor to suppress ER signaling, and cofactor interactions such as with the repressor TIP27 [PMID:23653479, PMID:28623141, PMID:11844790, PMID:15302918]."},"prefetch_data":{"uniprot":{"accession":"P49116","full_name":"Nuclear receptor subfamily 2 group C member 2","aliases":["Orphan nuclear receptor TAK1","Orphan nuclear receptor TR4","Testicular receptor 4"],"length_aa":596,"mass_kda":65.4,"function":"Orphan nuclear receptor that can act as a repressor or activator of transcription. An important repressor of nuclear receptor signaling pathways such as retinoic acid receptor, retinoid X, vitamin D3 receptor, thyroid hormone receptor and estrogen receptor pathways. May regulate gene expression during the late phase of spermatogenesis. Together with NR2C1, forms the core of the DRED (direct repeat erythroid-definitive) complex that represses embryonic and fetal globin transcription including that of GATA1. Binds to hormone response elements (HREs) consisting of two 5'-AGGTCA-3' half site direct repeat consensus sequences. Plays a fundamental role in early embryonic development and embryonic stem cells. Required for normal spermatogenesis and cerebellum development. Appears to be important for neurodevelopmentally regulated behavior (By similarity). Activates transcriptional activity of LHCG. Antagonist of PPARA-mediated transactivation","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P49116/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NR2C2","classification":"Not Classified","n_dependent_lines":25,"n_total_lines":1208,"dependency_fraction":0.020695364238410598},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NR2C2","total_profiled":1310},"omim":[{"mim_id":"619211","title":"HIPPOCALCIN-LIKE 4; HPCAL4","url":"https://www.omim.org/entry/619211"},{"mim_id":"617962","title":"ZINC FINGER PROTEIN 827; ZNF827","url":"https://www.omim.org/entry/617962"},{"mim_id":"613363","title":"DYNEIN, CYTOPLASMIC 2, INTERMEDIATE CHAIN 2; DYNC2I2","url":"https://www.omim.org/entry/613363"},{"mim_id":"606681","title":"NUCLEAR RECEPTOR-BINDING SET DOMAIN PROTEIN 1; NSD1","url":"https://www.omim.org/entry/606681"},{"mim_id":"606246","title":"JAZF ZINC FINGER 1; JAZF1","url":"https://www.omim.org/entry/606246"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NR2C2"},"hgnc":{"alias_symbol":["TAK1","TR2R1","hTAK1"],"prev_symbol":["TR4"]},"alphafold":{"accession":"P49116","domains":[{"cath_id":"3.30.50.10","chopping":"125-185","consensus_level":"medium","plddt":96.138,"start":125,"end":185},{"cath_id":"1.10.565.10","chopping":"312-320_353-590","consensus_level":"high","plddt":84.4281,"start":312,"end":590}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P49116","model_url":"https://alphafold.ebi.ac.uk/files/AF-P49116-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P49116-F1-predicted_aligned_error_v6.png","plddt_mean":65.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NR2C2","jax_strain_url":"https://www.jax.org/strain/search?query=NR2C2"},"sequence":{"accession":"P49116","fasta_url":"https://rest.uniprot.org/uniprotkb/P49116.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P49116/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P49116"}},"corpus_meta":[{"pmid":"11460167","id":"PMC_11460167","title":"TAK1 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and identified as a member of the steroid receptor superfamily closely related to TR2, with differential tissue expression suggesting a role in transcriptional regulation in neurons (granule cells of hippocampus and cerebellum).\",\n      \"method\": \"cDNA library screening, sequence analysis, tissue expression profiling\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — original cloning and localization paper, single lab\",\n      \"pmids\": [\"8016112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NR2C2 (TR4) forms a heterodimer with TR2 that constitutes the core of the DRED repressor complex (~540 kDa), which binds DR1 sites in the human embryonic (ε-) and fetal (γ-) globin gene promoters to repress their transcription in definitive erythroid cells; one HPFH mutation in a DR1 site reduces TR2/TR4 binding in vitro.\",\n      \"method\": \"Co-immunoprecipitation, EMSA, size-exclusion chromatography, transgenic mouse overexpression, in vitro binding assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, EMSA, transgenic mouse phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"12093744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NR2C2 (TR4) suppresses estrogen receptor (ER)-mediated transactivation through direct protein-protein interaction that inhibits ER homodimerization and prevents ER binding to the estrogen response element, thereby suppressing ER target genes (cyclin D1, pS2) and ER-mediated cell proliferation in MCF-7 cells.\",\n      \"method\": \"EMSA, GST pull-down, stable transfection, cell proliferation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro binding assay with mutagenesis context, GST pull-down, functional cell assay\",\n      \"pmids\": [\"11844790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TIP27, a novel 27 kDa zinc-finger protein, interacts specifically with the ligand-binding domain (LBD) of NR2C2 (TR4) via its TAK1-interaction domain (residues Asp39–Lys79) and functions as a strong repressor of TR4-mediated transactivation without inhibiting TR4 homodimerization or DR1 binding, potentially by blocking coactivator recruitment.\",\n      \"method\": \"Yeast two-hybrid, mammalian two-hybrid, pull-down assay, confocal co-localization, luciferase reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Y2H, pull-down, co-localization, reporter), single lab\",\n      \"pmids\": [\"15302918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NR2C2 (TR4) directly transactivates the PEPCK promoter by binding to a TR4 response element (TR4RE) at −451 to −439 in the promoter, thereby promoting gluconeogenesis; TR4 knockout mice show reduced PEPCK expression and impaired gluconeogenesis.\",\n      \"method\": \"Luciferase reporter assay, EMSA, chromatin immunoprecipitation, siRNA knockdown, TR4 knockout mice, glucose production assay\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP, EMSA, KO mouse, in vitro + in vivo concordant results\",\n      \"pmids\": [\"17827404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NR2C2 (TR4) and TR2 directly repress Gata1/GATA1 transcription in murine and human erythroid progenitor cells by binding an evolutionarily conserved DR element within the GATA1 hematopoietic enhancer (G1HE); mutation of this DR element elevates Gata1 promoter activity and reduces responsiveness to TR2/TR4.\",\n      \"method\": \"Transgenic mouse overexpression, TR2/TR4 germline-null mice, shRNA knockdown in CD34+ progenitors, EMSA, ChIP, luciferase reporter\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple genetic models (GOF transgenic, LOF knockout, shRNA), ChIP, EMSA, mutagenesis\",\n      \"pmids\": [\"17974920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The crystal structure of the ligand-free TR4 ligand-binding domain reveals an autorepressed conformation in which the ligand binding pocket is filled by helix 10 and the cofactor binding site is occupied by the AF-2 helix; retinol and retinoic acid promote TR4 to recruit coactivators and activate transcription, identifying TR4 as a ligand-regulated nuclear receptor.\",\n      \"method\": \"X-ray crystallography, coactivator recruitment assay, transcriptional reporter assay, mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional mutagenesis validation\",\n      \"pmids\": [\"21068381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Genome-wide ChIP-seq identified TR4 (NR2C2) binding sites across four human cell types, revealing that <30% contain the canonical DR1 motif; a subset of TR4 binding sites overlaps with ETS factor ELK4 binding sites lacking DR1 elements, suggesting TR4 can be recruited to chromatin via interaction with ETS factors.\",\n      \"method\": \"ChIP-seq in four human cell lines, motif analysis, co-localization with ELK4 ChIP-seq\",\n      \"journal\": \"BMC genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP-seq with bioinformatics; protein interaction inferred, not directly demonstrated\",\n      \"pmids\": [\"21126370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NR2C2 (TR4) is overexpressed in corticotroph tumors and transcriptionally activates proopiomelanocortin (POMC) through a direct repeat 1 (DR1) response element in the POMC promoter; MAPK-mediated phosphorylation of TR4 enhances this transactivation, and TR4 knockdown decreases circulating ACTH and corticosterone in vivo.\",\n      \"method\": \"Luciferase reporter, ChIP, overexpression/knockdown in cell lines, in vivo mouse tumor model, MAPK phosphorylation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP, reporter, in vivo mouse model, multiple orthogonal methods\",\n      \"pmids\": [\"23653479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SIRT7-mediated deacetylation of DDB1 at Lys1121 attenuates the CUL4B/DDB1/DCAF1 E3 ubiquitin ligase complex by reducing DDB1-DCAF1 binding, thereby stabilizing NR2C2 (TR4) protein and increasing expression of TR4 target genes (Cd36, Cidea, Cidec, Pparg1).\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis (K1121R), overexpression, western blot, qPCR\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP and mutagenesis in single lab; functional readout on TR4 targets\",\n      \"pmids\": [\"28623141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NR2C2 (TR4) transcriptionally activates the RNA-binding protein QKI, which increases circZEB1 levels; circZEB1 sponges miR-141-3p to increase ZEB1 expression, thereby promoting prostate cancer radioresistance via the TR4-QKI-circZEB1-miR-141-3p-ZEB1 axis.\",\n      \"method\": \"ChIP, luciferase reporter, shRNA knockdown, in vivo mouse model, qPCR\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — ChIP and functional rescue, single lab\",\n      \"pmids\": [\"32768524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NR2C2 (TR4) directly suppresses HCC cell invasion by transcriptionally downregulating EphA2 expression via direct binding to TR4 response elements (TR4REs) in the 5' EphA2 promoter, as confirmed by in vivo orthotopic xenograft experiments.\",\n      \"method\": \"ChIP, luciferase reporter, siRNA knockdown, migration/invasion assay, in vivo orthotopic mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with functional rescue, in vivo confirmation, single lab\",\n      \"pmids\": [\"29449527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NR2C2 (TR4) transcriptionally activates lncTASR (ENST00000600671.1), which stabilizes AXL mRNA to increase AXL protein expression and confer sunitinib resistance in renal cell carcinoma; targeting TR4 with tretinoin or shRNA restores sunitinib sensitivity.\",\n      \"method\": \"ChIP, luciferase reporter, shRNA knockdown, qPCR, western blot, in vivo mouse xenograft model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — ChIP and in vivo functional data, single lab\",\n      \"pmids\": [\"31501521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NR2C2 (TR4) is a direct target of miR-627-5p; lncRNA UCA1 acts as a miR-627-5p sponge to upregulate NR2C2 expression, and an upstream open reading frame (uORF) in the NR2C2 5'UTR negatively regulates NR2C2 protein production, forming a feedback regulatory loop controlling glioma cell malignancy.\",\n      \"method\": \"Dual luciferase reporter, ChIP, western blot, qPCR, shRNA/overexpression, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — reporter assay validation and ChIP; uORF mechanism partially characterized\",\n      \"pmids\": [\"30518750\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NR2C2 (TR4) is a ligand-regulated nuclear receptor (activated by retinoids and fatty acid metabolites) that, as a TR2/TR4 heterodimer, binds DR1 elements in target gene promoters to repress embryonic/fetal globin and Gata1 transcription in erythroid cells; it also transactivates PEPCK (gluconeogenesis) and POMC (ACTH secretion), suppresses estrogen receptor signaling via direct protein-protein interaction, and is regulated post-translationally by MAPK-mediated phosphorylation and by CUL4B/DDB1/DCAF1-mediated ubiquitin-dependent degradation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NR2C2 (TR4) is a ligand-regulated orphan nuclear receptor that functions as a transcriptional activator and repressor across diverse biological processes including erythropoiesis, gluconeogenesis, and neuroendocrine signaling. As a heterodimer with TR2, it constitutes the DRED repressor complex that binds DR1 elements in embryonic and fetal globin gene promoters and the GATA1 hematopoietic enhancer to silence these genes in definitive erythroid cells [PMID:12093744, PMID:17974920]. The ligand-binding domain adopts an autorepressed conformation in the absence of ligand, with retinol and retinoic acid promoting coactivator recruitment and transcriptional activation of target genes including PEPCK and POMC [PMID:21068381, PMID:17827404, PMID:23653479]. TR4 activity is modulated by MAPK-mediated phosphorylation, CUL4B/DDB1/DCAF1-dependent ubiquitin-mediated degradation, protein–protein interaction with estrogen receptor to suppress ER signaling, and cofactor interactions such as with the repressor TIP27 [PMID:23653479, PMID:28623141, PMID:11844790, PMID:15302918].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Cloning of NR2C2 (TR4) established the existence of a novel nuclear receptor closely related to TR2 with enriched expression in brain and reproductive tissues, raising the question of its transcriptional targets and functions.\",\n      \"evidence\": \"cDNA library screening from hypothalamus, prostate, and testis; tissue expression profiling\",\n      \"pmids\": [\"8016112\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No target genes or DNA-binding specificity identified\", \"Ligand unknown\", \"Single-lab cloning without independent confirmation at the time\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of the TR2/TR4 (DRED) heterodimer as the repressor of embryonic and fetal globin genes via DR1 elements provided the first functional role for NR2C2 in erythroid gene regulation and connected it to hereditary persistence of fetal hemoglobin pathogenesis.\",\n      \"evidence\": \"Co-IP, EMSA, size-exclusion chromatography, transgenic mouse overexpression\",\n      \"pmids\": [\"12093744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Corepressor components of the ~540 kDa DRED complex not identified\", \"In vivo loss-of-function in erythroid lineage not yet shown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstration that TR4 suppresses estrogen receptor transactivation through direct protein–protein interaction that blocks ER dimerization revealed a non-DNA-binding mechanism by which TR4 modulates hormone signaling.\",\n      \"evidence\": \"GST pull-down, EMSA, stable transfection in MCF-7 cells, proliferation assay\",\n      \"pmids\": [\"11844790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance in vivo not established\", \"Stoichiometry and structural basis of TR4–ER interaction unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Discovery of the corepressor TIP27 as a direct LBD-interacting partner that represses TR4 transactivation without disrupting DNA binding indicated that TR4 activity is modulated by cofactor competition at the LBD surface.\",\n      \"evidence\": \"Yeast two-hybrid, mammalian two-hybrid, pull-down, confocal co-localization, reporter assay\",\n      \"pmids\": [\"15302918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous stoichiometry of TIP27–TR4 complex unknown\", \"No in vivo loss-of-function for TIP27\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"TR4 was shown to directly activate PEPCK transcription and repress GATA1 transcription via cognate DR elements, establishing it as a bifunctional regulator of both metabolic (gluconeogenesis) and hematopoietic gene programs, validated in knockout mice.\",\n      \"evidence\": \"ChIP, EMSA, luciferase reporter, siRNA, TR4 KO mice, TR2/TR4-null and GOF transgenic mice, shRNA in CD34+ cells\",\n      \"pmids\": [\"17827404\", \"17974920\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How context-dependent switching between activation and repression is determined remains unclear\", \"Genome-wide target repertoire not yet defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The crystal structure of the TR4 LBD revealed an autorepressed conformation with an occluded coactivator groove, and retinol/retinoic acid were identified as ligands that relieve autoinhibition and promote coactivator recruitment, resolving the long-standing question of whether TR4 is ligand-regulated.\",\n      \"evidence\": \"X-ray crystallography, coactivator recruitment assay, transcriptional reporter, mutagenesis\",\n      \"pmids\": [\"21068381\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological retinoid concentrations required for activation in vivo not determined\", \"No co-crystal structure with ligand\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genome-wide ChIP-seq revealed that the majority of TR4 binding sites lack canonical DR1 motifs and overlap with ETS factor binding sites, suggesting alternative chromatin recruitment mechanisms beyond direct DNA recognition.\",\n      \"evidence\": \"ChIP-seq in four human cell lines with motif and co-occupancy analysis\",\n      \"pmids\": [\"21126370\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between TR4 and ETS factors not demonstrated\", \"Functional significance of non-DR1 sites not validated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"TR4 was found to activate POMC transcription via a DR1 element and to be potentiated by MAPK-mediated phosphorylation, linking TR4 to HPA-axis regulation and establishing phosphorylation as a post-translational activating mechanism.\",\n      \"evidence\": \"ChIP, luciferase reporter, overexpression/knockdown in corticotroph cells, in vivo mouse tumor model, MAPK phosphorylation assay\",\n      \"pmids\": [\"23653479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation sites and responsible MAPK family member not fully characterized\", \"Relevance to normal pituitary physiology versus tumor context unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of CUL4B/DDB1/DCAF1 as the E3 ligase targeting TR4 for ubiquitin-dependent degradation, modulated by SIRT7-mediated DDB1 deacetylation, established a proteostatic regulatory layer for TR4 protein levels.\",\n      \"evidence\": \"Co-IP, K1121R mutagenesis of DDB1, western blot, qPCR of TR4 target genes\",\n      \"pmids\": [\"28623141\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ubiquitination of TR4 not demonstrated with in vitro reconstitution\", \"Specific ubiquitinated lysine residues on TR4 not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Multiple cancer-context studies showed that TR4 transcriptionally controls diverse downstream effectors (EphA2 in HCC, QKI/circZEB1 axis in prostate cancer, lncTASR/AXL in RCC), implicating TR4 in tumor invasion and therapy resistance through cell-type-specific target gene programs.\",\n      \"evidence\": \"ChIP, luciferase reporter, shRNA/siRNA knockdown, in vivo xenograft and orthotopic models across multiple cancer types\",\n      \"pmids\": [\"29449527\", \"32768524\", \"31501521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanisms determining cell-type-specific target selection are unknown\", \"Therapeutic targeting of TR4 in cancer not clinically validated\", \"Findings largely from single-lab studies\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full spectrum of physiological TR4 ligands, the structural basis of TR2/TR4 heterodimerization and DRED complex assembly, and the mechanisms governing context-dependent switching between transcriptional activation and repression.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal structure of TR4 LBD with retinoid ligand\", \"DRED complex corepressor subunit identities unknown\", \"No systematic loss-of-function studies in adult tissues beyond erythroid and metabolic contexts\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 4, 5, 7, 8]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 4, 5, 6, 8, 10, 11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 3, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0074160\", \"supporting_discovery_ids\": [1, 2, 4, 5, 6, 8, 10, 11, 12]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [\n      \"DRED (TR2/TR4 repressor complex)\"\n    ],\n    \"partners\": [\n      \"NR2C1\",\n      \"ESR1\",\n      \"TIP27\",\n      \"DDB1\",\n      \"CUL4B\",\n      \"DCAF1\",\n      \"ELK4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}