{"gene":"LCOR","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":2003,"finding":"LCoR is recruited to agonist-bound nuclear receptors (estrogen receptor alpha) through a single LXXLL motif, with binding dependent in part on residues in the coactivator binding pocket distinct from those bound by TIF-2.","method":"In vitro binding assays, co-immunoprecipitation, mutagenesis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (in vitro binding, Co-IP, mutagenesis) in a highly cited foundational paper","pmids":["12535528"],"is_preprint":false},{"year":2003,"finding":"LCoR represses nuclear receptor-activated transcription through both HDAC-dependent and HDAC-independent mechanisms; HDAC inhibitor trichostatin A abolishes repression in a receptor-dependent fashion.","method":"Reporter gene assays with TSA treatment, in vitro and in vivo HDAC binding assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — functional assays with pharmacological inhibition and direct binding, replicated across multiple receptor systems","pmids":["12535528"],"is_preprint":false},{"year":2003,"finding":"LCoR directly binds specific HDACs (including HDAC3) in vitro and in vivo, and recruits CtBP corepressors through two consensus CtBP-binding motifs, colocalizing with CtBPs in the nucleus.","method":"In vitro pulldown, co-immunoprecipitation, colocalization by confocal microscopy","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding shown in vitro and in vivo with multiple orthogonal methods, foundational paper with >200 citations","pmids":["12535528"],"is_preprint":false},{"year":2009,"finding":"LCoR directly interacts with HDAC6 via a central domain; HDAC6 is partially nuclear in MCF7 cells, colocalizes with LCoR, and augments LCoR-mediated corepression of estrogen-inducible genes; both are co-recruited to ERα target gene promoters in a hormone-dependent manner.","method":"In vitro binding assay, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), re-ChIP, siRNA knockdown, reporter gene assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including in vitro binding, ChIP, re-ChIP, and functional reporter assays","pmids":["19744931"],"is_preprint":false},{"year":2012,"finding":"LCoR interacts with transcription factor KLF6 through its C-terminal domain; the LCoR-KLF6 complex binds CDKN1A (p21WAF1/CIP1) and CDH1 promoters and represses their transcription via recruitment of CtBP1 and HDACs.","method":"Yeast two-hybrid screen, Co-IP, chromatin immunoprecipitation, reporter gene assay, siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — yeast two-hybrid discovery validated by Co-IP, ChIP, and functional siRNA knockdown experiments","pmids":["22277651"],"is_preprint":false},{"year":2017,"finding":"LCoR interacts with RIP140 (receptor-interacting protein of 140 kDa) requiring the helix-turn-helix (HTH) domain of LCoR and the N- and C-terminal regions of RIP140; RIP140 is necessary for LCoR-mediated inhibition of gene expression and cell proliferation in breast cancer cells.","method":"In vitro interaction assay, co-immunoprecipitation, proximity ligation assay, confocal microscopy, siRNA knockdown with functional readouts","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (in vitro, Co-IP, PLA, microscopy, functional knockdown) in a single study","pmids":["28414308"],"is_preprint":false},{"year":2017,"finding":"The HTH domain of LCoR is required for transcriptional repression and inhibition of estrogen-induced target gene expression and breast cancer cell proliferation.","method":"Mutagenesis analysis, reporter gene assays, cell proliferation assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 1-2 — mutagenesis with functional readout, single study","pmids":["28414308"],"is_preprint":false},{"year":2017,"finding":"miR-199a directly represses LCOR expression, promoting mammary stem cell and breast cancer stem cell properties by preventing LCOR-mediated priming of interferon responses that would otherwise induce differentiation and senescence.","method":"miRNA target validation, luciferase reporter assay, loss-of-function and gain-of-function experiments, in vivo tumor initiation/metastasis assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — direct miRNA-target validation with multiple functional readouts in vitro and in vivo, replicated in multiple models","pmids":["28530657"],"is_preprint":false},{"year":2017,"finding":"LCoR directly interacts with C/EBPβ through its C-terminal HTH domain, suppresses C/EBPβ transcriptional activity by recruiting CtBPs to C/EBPα and PPARγ2 promoters and modulating histone modifications, thereby inhibiting early adipogenesis.","method":"Affinity purification/mass spectrometry, Co-IP, reporter gene assays, ChIP, mutagenesis, overexpression and knockdown in 3T3-L1 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — unbiased affinity purification validated by Co-IP and ChIP with functional mutagenesis","pmids":["28972158"],"is_preprint":false},{"year":2018,"finding":"LCOR encodes PALI1 (PRC2 associated LCOR isoform 1), a vertebrate-specific PRC2.1 accessory protein that promotes PRC2 methyltransferase activity (H3K27 trimethylation) in vitro and in vivo; PALI1 is essential for mouse development and defines a PRC2 subtype antagonistic to the AEBP2-containing PRC2.2.","method":"In vitro methyltransferase assay, co-immunoprecipitation, mouse genetic knockout, ChIP-seq","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro enzymatic assay, genetic knockout with developmental phenotype, ChIP-seq, and biochemical subunit characterization, published in high-impact journal","pmids":["29628311"],"is_preprint":false},{"year":2018,"finding":"LCoR acts as a coactivator (not corepressor) for PPARγ-RXRα heterodimers at the Muc1 promoter by interacting with both PPARγ and RXRα through adjacent noncanonical protein motifs; this interaction is inhibited by rexinoid-bound RXRα AF2 domain.","method":"Luciferase reporter assay, co-immunoprecipitation, Lcor-null mouse placenta analysis, mutagenesis of AF2 domain","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — reporter assays, Co-IP, in vivo genetic null validation, and domain mutagenesis","pmids":["29463649"],"is_preprint":false},{"year":2018,"finding":"lncRNA H19 acts as a sponge for miR-188, which directly targets and represses LCoR; elevated miR-188 or LCoR knockdown suppresses osteogenic differentiation and promotes adipogenic differentiation of mBMSCs.","method":"Luciferase reporter assay (miRNA target validation), RT-PCR, siRNA knockdown, osteogenic/adipogenic differentiation assays","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 3 — luciferase validation of miRNA-target relationship with functional differentiation readout, single study","pmids":["29663375"],"is_preprint":false},{"year":2022,"finding":"LCOR acts as a master transcriptional activator of antigen processing/presentation machinery (APM) genes by binding to IFN-stimulated response elements (ISREs) in an IFN signaling-independent manner; genetic modification of LCOR expression directly modulates tumor immunogenicity and immune checkpoint blockade responsiveness.","method":"Genetic modification (overexpression/knockdown), ChIP/binding to ISREs, flow cytometry for APM surface markers, in vivo tumor models with anti-PD-L1","journal":"Nature cancer","confidence":"High","confidence_rationale":"Tier 2 — direct binding to ISREs combined with genetic loss/gain-of-function and in vivo functional validation","pmids":["35301507"],"is_preprint":false},{"year":2025,"finding":"LCOR interacts with RUNX1 transcriptional suppressor to relieve RUNX1-mediated repression of PLCL1, leading to increased PLCL1 expression that inhibits lipid accumulation and tumor progression in clear cell renal cell carcinoma.","method":"Co-immunoprecipitation, ChIP-qPCR, in vitro and in vivo functional assays, bioinformatics","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP and ChIP with functional in vivo validation, single study","pmids":["40083699"],"is_preprint":false}],"current_model":"LCOR (ligand-dependent corepressor) is a multifunctional transcriptional regulator that: (1) is recruited to agonist-bound nuclear receptors via an LXXLL motif and attenuates their signaling by assembling repressor complexes containing HDACs (HDAC3, HDAC6) and CtBP corepressors through its N-terminal and central domains; (2) can also act as a coactivator for specific nuclear receptor heterodimers (PPARγ-RXRα) through noncanonical protein motifs; (3) encodes PALI1, a vertebrate-specific PRC2.1 accessory subunit that stimulates H3K27 trimethylation and antagonizes PRC2.2; (4) interacts with transcription factors KLF6, C/EBPβ, and RUNX1 to modulate gene expression in cancer and differentiation contexts; (5) partners with RIP140 via its HTH domain for co-regulation of target genes; and (6) activates antigen processing/presentation machinery genes by binding ISREs independently of IFN signaling, while being suppressed by miR-199a in stem cells to evade IFN-mediated differentiation."},"narrative":{"teleology":[{"year":2003,"claim":"Establishing that LCOR is a novel ligand-dependent corepressor recruited to agonist-bound nuclear receptors via an LXXLL motif, assembling HDAC- and CtBP-containing repressor complexes—this defined the gene's founding molecular activity and distinguished it from classical corepressors.","evidence":"In vitro binding assays, Co-IP, mutagenesis, reporter gene assays with TSA treatment, and confocal colocalization in mammalian cells","pmids":["12535528"],"confidence":"High","gaps":["Structural basis of LXXLL-mediated recognition not resolved","Genome-wide target repertoire unknown","In vivo physiological relevance not tested"]},{"year":2009,"claim":"Demonstrating that HDAC6 is a direct LCOR partner co-recruited to ERα target promoters in a hormone-dependent manner extended the corepressor complex composition beyond HDAC3 and CtBP.","evidence":"In vitro binding, Co-IP, ChIP, re-ChIP, siRNA knockdown, and reporter assays in MCF7 cells","pmids":["19744931"],"confidence":"High","gaps":["Relative contributions of HDAC3 versus HDAC6 to repression not disentangled","Whether HDAC6 catalytic activity or scaffold function is required is unclear"]},{"year":2012,"claim":"Identifying KLF6 as a transcription factor partner that recruits LCOR-CtBP1-HDAC complexes to CDKN1A and CDH1 promoters showed LCOR operates beyond nuclear receptors to regulate cell cycle and adhesion gene expression.","evidence":"Yeast two-hybrid screen, Co-IP, ChIP, reporter assays, and siRNA knockdown","pmids":["22277651"],"confidence":"High","gaps":["Physiological context for KLF6-LCOR interaction in vivo not established","Whether LCOR-KLF6 cooperation is tissue-specific is unknown"]},{"year":2017,"claim":"Defining the HTH domain as essential for LCOR-mediated transcriptional repression and showing RIP140 is required for LCOR's anti-proliferative effects in breast cancer cells revealed the modular architecture of the LCOR repressor complex.","evidence":"In vitro interaction, Co-IP, proximity ligation assay, mutagenesis, reporter and proliferation assays in breast cancer cell lines","pmids":["28414308"],"confidence":"High","gaps":["Whether HTH domain functions independently of CtBP/HDAC recruitment is unresolved","RIP140-LCOR stoichiometry and structural interface unknown"]},{"year":2017,"claim":"Demonstrating that miR-199a directly represses LCOR to maintain stemness by blocking LCOR-mediated interferon response priming connected LCOR to stem cell differentiation and established a post-transcriptional regulatory layer.","evidence":"miRNA target validation, luciferase reporter, gain/loss-of-function, in vivo tumor initiation and metastasis assays","pmids":["28530657"],"confidence":"High","gaps":["How LCOR activates interferon response genes mechanistically was not resolved","Whether other miRNAs regulate LCOR in additional stem cell contexts is unknown"]},{"year":2017,"claim":"Showing LCOR interacts with C/EBPβ via its HTH domain and suppresses adipogenic gene promoters through CtBP recruitment and histone modification changes extended LCOR's regulatory repertoire to adipocyte differentiation.","evidence":"Affinity purification/mass spectrometry, Co-IP, ChIP, mutagenesis, and differentiation assays in 3T3-L1 cells","pmids":["28972158"],"confidence":"High","gaps":["In vivo adipogenesis phenotype not tested","Whether LCOR regulates later stages of adipocyte maturation is unclear"]},{"year":2018,"claim":"Discovering that LCOR encodes PALI1, a vertebrate-specific PRC2.1 accessory subunit that stimulates H3K27me3 and is essential for mouse development, revealed an entirely separate function from its nuclear receptor corepressor role and defined a PRC2 subtype antagonistic to PRC2.2.","evidence":"In vitro methyltransferase assay, Co-IP, mouse genetic knockout, ChIP-seq","pmids":["29628311"],"confidence":"High","gaps":["How PALI1 stimulates EZH2 catalytic activity at the structural level is unknown","Tissue-specific contributions of PALI1 versus AEBP2-PRC2.2 not delineated","Relationship between PALI1/PRC2.1 function and LCOR's corepressor activity is unresolved"]},{"year":2018,"claim":"Showing LCOR acts as a coactivator for PPARγ-RXRα heterodimers through noncanonical motifs demonstrated context-dependent switching between corepressor and coactivator functions.","evidence":"Luciferase reporter, Co-IP, Lcor-null mouse placenta analysis, AF2 domain mutagenesis","pmids":["29463649"],"confidence":"High","gaps":["Full spectrum of genes coactivated by LCOR-PPARγ-RXRα is unknown","Structural basis for rexinoid-mediated inhibition of the interaction not resolved"]},{"year":2022,"claim":"Establishing that LCOR binds ISREs and activates antigen processing/presentation genes independently of IFN signaling resolved how LCOR primes interferon-like responses and directly linked LCOR expression to tumor immunogenicity and immune checkpoint therapy responsiveness.","evidence":"Genetic overexpression/knockdown, ChIP at ISREs, flow cytometry for APM markers, in vivo tumor models with anti-PD-L1","pmids":["35301507"],"confidence":"High","gaps":["Whether LCOR binds ISREs directly as a monomer or requires cofactors is unresolved","Structural basis of LCOR-ISRE recognition unknown","Whether PALI1 isoform also binds ISREs is not tested"]},{"year":2025,"claim":"Demonstrating that LCOR interacts with RUNX1 to relieve RUNX1-mediated repression of PLCL1, inhibiting lipid accumulation and tumor progression in ccRCC, expanded LCOR's transcription factor partnership repertoire to include RUNX1.","evidence":"Co-IP, ChIP-qPCR, in vitro and in vivo functional assays in clear cell renal cell carcinoma models","pmids":["40083699"],"confidence":"Medium","gaps":["Mechanism by which LCOR relieves RUNX1 repression (competitive displacement versus complex remodeling) is not established","Single study without independent replication","Generalizability beyond ccRCC untested"]},{"year":null,"claim":"The relationship between LCOR's PRC2.1/PALI1 function and its nuclear receptor corepressor and ISRE-binding activities remains mechanistically unresolved, as does the structural basis for LCOR's context-dependent switching between corepressor and coactivator roles.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of full-length LCOR or its domains in complex with partners","Isoform-specific functions (PALI1 versus shorter LCOR) not systematically dissected","Genome-wide direct target map integrating all reported LCOR functions is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,4,6,8,10,12,13]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[12]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[9]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,3,9,12]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,4,6,8,10,12]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[9]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,12]}],"complexes":["PRC2.1"],"partners":["HDAC3","HDAC6","CTBP1","NRIP1","KLF6","CEBPB","EZH2","RUNX1"],"other_free_text":[]},"mechanistic_narrative":"LCOR is a multifunctional transcriptional regulator that serves as a ligand-dependent corepressor of nuclear receptors, a context-dependent coactivator, a PRC2.1 accessory subunit stimulating H3K27 trimethylation, and an IFN-independent activator of antigen presentation genes. LCOR is recruited to agonist-bound nuclear receptors (e.g., ERα) via a single LXXLL motif and assembles repressor complexes containing HDAC3, HDAC6, and CtBP corepressors to attenuate hormone-driven transcription; the helix-turn-helix (HTH) domain mediates interaction with RIP140 and C/EBPβ for repression of estrogen-inducible genes, breast cancer cell proliferation, and early adipogenesis [PMID:12535528, PMID:19744931, PMID:28414308, PMID:28972158]. LCOR also encodes a longer isoform, PALI1, that functions as a vertebrate-specific PRC2.1 subunit essential for mouse development, promoting EZH2-mediated H3K27 trimethylation and defining a PRC2 subtype antagonistic to AEBP2-containing PRC2.2 [PMID:29628311]. Independently of interferon signaling, LCOR binds IFN-stimulated response elements to activate antigen processing and presentation machinery genes, directly modulating tumor immunogenicity and responsiveness to immune checkpoint blockade [PMID:35301507]."},"prefetch_data":{"uniprot":{"accession":"Q96JN0","full_name":"Ligand-dependent corepressor","aliases":["Mblk1-related protein 2"],"length_aa":433,"mass_kda":47.0,"function":"May act as transcription activator that binds DNA elements with the sequence 5'-CCCTATCGATCGATCTCTACCT-3' (By similarity). Repressor of ligand-dependent transcription activation by target nuclear receptors. Repressor of ligand-dependent transcription activation by ESR1, ESR2, NR3C1, PGR, RARA, RARB, RARG, RXRA and VDR","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q96JN0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LCOR","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CTBP1","stoichiometry":0.2},{"gene":"CTBP2","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGA1","stoichiometry":0.2},{"gene":"HMGN5","stoichiometry":0.2},{"gene":"NUCKS1","stoichiometry":0.2},{"gene":"NUMA1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/LCOR","total_profiled":1310},"omim":[{"mim_id":"617934","title":"AE-BINDING PROTEIN 2; AEBP2","url":"https://www.omim.org/entry/617934"},{"mim_id":"617795","title":"ELONGIN BC- AND POLYCOMB REPRESSIVE COMPLEX 2-ASSOCIATED PROTEIN; EPOP","url":"https://www.omim.org/entry/617795"},{"mim_id":"611799","title":"LIGAND-DEPENDENT NUCLEAR RECEPTOR COREPRESSOR-LIKE PROTEIN; LCORL","url":"https://www.omim.org/entry/611799"},{"mim_id":"607698","title":"LIGAND-DEPENDENT NUCLEAR RECEPTOR COREPRESSOR; LCOR","url":"https://www.omim.org/entry/607698"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":24.1}],"url":"https://www.proteinatlas.org/search/LCOR"},"hgnc":{"alias_symbol":["MLR2","FLJ38026","KIAA1795","DKFZP564P1916","FLJ13022"],"prev_symbol":["C10orf12"]},"alphafold":{"accession":"Q96JN0","domains":[{"cath_id":"1.10.10.60","chopping":"350-389","consensus_level":"high","plddt":96.0465,"start":350,"end":389}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96JN0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96JN0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96JN0-F1-predicted_aligned_error_v6.png","plddt_mean":55.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LCOR","jax_strain_url":"https://www.jax.org/strain/search?query=LCOR"},"sequence":{"accession":"Q96JN0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96JN0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96JN0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96JN0"}},"corpus_meta":[{"pmid":"12535528","id":"PMC_12535528","title":"Ligand-dependent 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\"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (in vitro binding, Co-IP, mutagenesis) in a highly cited foundational paper\",\n      \"pmids\": [\"12535528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"LCoR represses nuclear receptor-activated transcription through both HDAC-dependent and HDAC-independent mechanisms; HDAC inhibitor trichostatin A abolishes repression in a receptor-dependent fashion.\",\n      \"method\": \"Reporter gene assays with TSA treatment, in vitro and in vivo HDAC binding assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional assays with pharmacological inhibition and direct binding, replicated across multiple receptor systems\",\n      \"pmids\": [\"12535528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"LCoR directly binds specific HDACs (including HDAC3) in vitro and in vivo, and recruits CtBP corepressors through two consensus CtBP-binding motifs, colocalizing with CtBPs in the nucleus.\",\n      \"method\": \"In vitro pulldown, co-immunoprecipitation, colocalization by confocal microscopy\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding shown in vitro and in vivo with multiple orthogonal methods, foundational paper with >200 citations\",\n      \"pmids\": [\"12535528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"LCoR directly interacts with HDAC6 via a central domain; HDAC6 is partially nuclear in MCF7 cells, colocalizes with LCoR, and augments LCoR-mediated corepression of estrogen-inducible genes; both are co-recruited to ERα target gene promoters in a hormone-dependent manner.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), re-ChIP, siRNA knockdown, reporter gene assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including in vitro binding, ChIP, re-ChIP, and functional reporter assays\",\n      \"pmids\": [\"19744931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LCoR interacts with transcription factor KLF6 through its C-terminal domain; the LCoR-KLF6 complex binds CDKN1A (p21WAF1/CIP1) and CDH1 promoters and represses their transcription via recruitment of CtBP1 and HDACs.\",\n      \"method\": \"Yeast two-hybrid screen, Co-IP, chromatin immunoprecipitation, reporter gene assay, siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — yeast two-hybrid discovery validated by Co-IP, ChIP, and functional siRNA knockdown experiments\",\n      \"pmids\": [\"22277651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LCoR interacts with RIP140 (receptor-interacting protein of 140 kDa) requiring the helix-turn-helix (HTH) domain of LCoR and the N- and C-terminal regions of RIP140; RIP140 is necessary for LCoR-mediated inhibition of gene expression and cell proliferation in breast cancer cells.\",\n      \"method\": \"In vitro interaction assay, co-immunoprecipitation, proximity ligation assay, confocal microscopy, siRNA knockdown with functional readouts\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (in vitro, Co-IP, PLA, microscopy, functional knockdown) in a single study\",\n      \"pmids\": [\"28414308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The HTH domain of LCoR is required for transcriptional repression and inhibition of estrogen-induced target gene expression and breast cancer cell proliferation.\",\n      \"method\": \"Mutagenesis analysis, reporter gene assays, cell proliferation assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis with functional readout, single study\",\n      \"pmids\": [\"28414308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"miR-199a directly represses LCOR expression, promoting mammary stem cell and breast cancer stem cell properties by preventing LCOR-mediated priming of interferon responses that would otherwise induce differentiation and senescence.\",\n      \"method\": \"miRNA target validation, luciferase reporter assay, loss-of-function and gain-of-function experiments, in vivo tumor initiation/metastasis assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct miRNA-target validation with multiple functional readouts in vitro and in vivo, replicated in multiple models\",\n      \"pmids\": [\"28530657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LCoR directly interacts with C/EBPβ through its C-terminal HTH domain, suppresses C/EBPβ transcriptional activity by recruiting CtBPs to C/EBPα and PPARγ2 promoters and modulating histone modifications, thereby inhibiting early adipogenesis.\",\n      \"method\": \"Affinity purification/mass spectrometry, Co-IP, reporter gene assays, ChIP, mutagenesis, overexpression and knockdown in 3T3-L1 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — unbiased affinity purification validated by Co-IP and ChIP with functional mutagenesis\",\n      \"pmids\": [\"28972158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LCOR encodes PALI1 (PRC2 associated LCOR isoform 1), a vertebrate-specific PRC2.1 accessory protein that promotes PRC2 methyltransferase activity (H3K27 trimethylation) in vitro and in vivo; PALI1 is essential for mouse development and defines a PRC2 subtype antagonistic to the AEBP2-containing PRC2.2.\",\n      \"method\": \"In vitro methyltransferase assay, co-immunoprecipitation, mouse genetic knockout, ChIP-seq\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro enzymatic assay, genetic knockout with developmental phenotype, ChIP-seq, and biochemical subunit characterization, published in high-impact journal\",\n      \"pmids\": [\"29628311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LCoR acts as a coactivator (not corepressor) for PPARγ-RXRα heterodimers at the Muc1 promoter by interacting with both PPARγ and RXRα through adjacent noncanonical protein motifs; this interaction is inhibited by rexinoid-bound RXRα AF2 domain.\",\n      \"method\": \"Luciferase reporter assay, co-immunoprecipitation, Lcor-null mouse placenta analysis, mutagenesis of AF2 domain\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reporter assays, Co-IP, in vivo genetic null validation, and domain mutagenesis\",\n      \"pmids\": [\"29463649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"lncRNA H19 acts as a sponge for miR-188, which directly targets and represses LCoR; elevated miR-188 or LCoR knockdown suppresses osteogenic differentiation and promotes adipogenic differentiation of mBMSCs.\",\n      \"method\": \"Luciferase reporter assay (miRNA target validation), RT-PCR, siRNA knockdown, osteogenic/adipogenic differentiation assays\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — luciferase validation of miRNA-target relationship with functional differentiation readout, single study\",\n      \"pmids\": [\"29663375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LCOR acts as a master transcriptional activator of antigen processing/presentation machinery (APM) genes by binding to IFN-stimulated response elements (ISREs) in an IFN signaling-independent manner; genetic modification of LCOR expression directly modulates tumor immunogenicity and immune checkpoint blockade responsiveness.\",\n      \"method\": \"Genetic modification (overexpression/knockdown), ChIP/binding to ISREs, flow cytometry for APM surface markers, in vivo tumor models with anti-PD-L1\",\n      \"journal\": \"Nature cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding to ISREs combined with genetic loss/gain-of-function and in vivo functional validation\",\n      \"pmids\": [\"35301507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LCOR interacts with RUNX1 transcriptional suppressor to relieve RUNX1-mediated repression of PLCL1, leading to increased PLCL1 expression that inhibits lipid accumulation and tumor progression in clear cell renal cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-qPCR, in vitro and in vivo functional assays, bioinformatics\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP and ChIP with functional in vivo validation, single study\",\n      \"pmids\": [\"40083699\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LCOR (ligand-dependent corepressor) is a multifunctional transcriptional regulator that: (1) is recruited to agonist-bound nuclear receptors via an LXXLL motif and attenuates their signaling by assembling repressor complexes containing HDACs (HDAC3, HDAC6) and CtBP corepressors through its N-terminal and central domains; (2) can also act as a coactivator for specific nuclear receptor heterodimers (PPARγ-RXRα) through noncanonical protein motifs; (3) encodes PALI1, a vertebrate-specific PRC2.1 accessory subunit that stimulates H3K27 trimethylation and antagonizes PRC2.2; (4) interacts with transcription factors KLF6, C/EBPβ, and RUNX1 to modulate gene expression in cancer and differentiation contexts; (5) partners with RIP140 via its HTH domain for co-regulation of target genes; and (6) activates antigen processing/presentation machinery genes by binding ISREs independently of IFN signaling, while being suppressed by miR-199a in stem cells to evade IFN-mediated differentiation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"LCOR is a multifunctional transcriptional regulator that serves as a ligand-dependent corepressor of nuclear receptors, a context-dependent coactivator, a PRC2.1 accessory subunit stimulating H3K27 trimethylation, and an IFN-independent activator of antigen presentation genes. LCOR is recruited to agonist-bound nuclear receptors (e.g., ERα) via a single LXXLL motif and assembles repressor complexes containing HDAC3, HDAC6, and CtBP corepressors to attenuate hormone-driven transcription; the helix-turn-helix (HTH) domain mediates interaction with RIP140 and C/EBPβ for repression of estrogen-inducible genes, breast cancer cell proliferation, and early adipogenesis [PMID:12535528, PMID:19744931, PMID:28414308, PMID:28972158]. LCOR also encodes a longer isoform, PALI1, that functions as a vertebrate-specific PRC2.1 subunit essential for mouse development, promoting EZH2-mediated H3K27 trimethylation and defining a PRC2 subtype antagonistic to AEBP2-containing PRC2.2 [PMID:29628311]. Independently of interferon signaling, LCOR binds IFN-stimulated response elements to activate antigen processing and presentation machinery genes, directly modulating tumor immunogenicity and responsiveness to immune checkpoint blockade [PMID:35301507].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing that LCOR is a novel ligand-dependent corepressor recruited to agonist-bound nuclear receptors via an LXXLL motif, assembling HDAC- and CtBP-containing repressor complexes—this defined the gene's founding molecular activity and distinguished it from classical corepressors.\",\n      \"evidence\": \"In vitro binding assays, Co-IP, mutagenesis, reporter gene assays with TSA treatment, and confocal colocalization in mammalian cells\",\n      \"pmids\": [\"12535528\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of LXXLL-mediated recognition not resolved\", \"Genome-wide target repertoire unknown\", \"In vivo physiological relevance not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating that HDAC6 is a direct LCOR partner co-recruited to ERα target promoters in a hormone-dependent manner extended the corepressor complex composition beyond HDAC3 and CtBP.\",\n      \"evidence\": \"In vitro binding, Co-IP, ChIP, re-ChIP, siRNA knockdown, and reporter assays in MCF7 cells\",\n      \"pmids\": [\"19744931\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of HDAC3 versus HDAC6 to repression not disentangled\", \"Whether HDAC6 catalytic activity or scaffold function is required is unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identifying KLF6 as a transcription factor partner that recruits LCOR-CtBP1-HDAC complexes to CDKN1A and CDH1 promoters showed LCOR operates beyond nuclear receptors to regulate cell cycle and adhesion gene expression.\",\n      \"evidence\": \"Yeast two-hybrid screen, Co-IP, ChIP, reporter assays, and siRNA knockdown\",\n      \"pmids\": [\"22277651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological context for KLF6-LCOR interaction in vivo not established\", \"Whether LCOR-KLF6 cooperation is tissue-specific is unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defining the HTH domain as essential for LCOR-mediated transcriptional repression and showing RIP140 is required for LCOR's anti-proliferative effects in breast cancer cells revealed the modular architecture of the LCOR repressor complex.\",\n      \"evidence\": \"In vitro interaction, Co-IP, proximity ligation assay, mutagenesis, reporter and proliferation assays in breast cancer cell lines\",\n      \"pmids\": [\"28414308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HTH domain functions independently of CtBP/HDAC recruitment is unresolved\", \"RIP140-LCOR stoichiometry and structural interface unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that miR-199a directly represses LCOR to maintain stemness by blocking LCOR-mediated interferon response priming connected LCOR to stem cell differentiation and established a post-transcriptional regulatory layer.\",\n      \"evidence\": \"miRNA target validation, luciferase reporter, gain/loss-of-function, in vivo tumor initiation and metastasis assays\",\n      \"pmids\": [\"28530657\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LCOR activates interferon response genes mechanistically was not resolved\", \"Whether other miRNAs regulate LCOR in additional stem cell contexts is unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing LCOR interacts with C/EBPβ via its HTH domain and suppresses adipogenic gene promoters through CtBP recruitment and histone modification changes extended LCOR's regulatory repertoire to adipocyte differentiation.\",\n      \"evidence\": \"Affinity purification/mass spectrometry, Co-IP, ChIP, mutagenesis, and differentiation assays in 3T3-L1 cells\",\n      \"pmids\": [\"28972158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo adipogenesis phenotype not tested\", \"Whether LCOR regulates later stages of adipocyte maturation is unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovering that LCOR encodes PALI1, a vertebrate-specific PRC2.1 accessory subunit that stimulates H3K27me3 and is essential for mouse development, revealed an entirely separate function from its nuclear receptor corepressor role and defined a PRC2 subtype antagonistic to PRC2.2.\",\n      \"evidence\": \"In vitro methyltransferase assay, Co-IP, mouse genetic knockout, ChIP-seq\",\n      \"pmids\": [\"29628311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PALI1 stimulates EZH2 catalytic activity at the structural level is unknown\", \"Tissue-specific contributions of PALI1 versus AEBP2-PRC2.2 not delineated\", \"Relationship between PALI1/PRC2.1 function and LCOR's corepressor activity is unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showing LCOR acts as a coactivator for PPARγ-RXRα heterodimers through noncanonical motifs demonstrated context-dependent switching between corepressor and coactivator functions.\",\n      \"evidence\": \"Luciferase reporter, Co-IP, Lcor-null mouse placenta analysis, AF2 domain mutagenesis\",\n      \"pmids\": [\"29463649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full spectrum of genes coactivated by LCOR-PPARγ-RXRα is unknown\", \"Structural basis for rexinoid-mediated inhibition of the interaction not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Establishing that LCOR binds ISREs and activates antigen processing/presentation genes independently of IFN signaling resolved how LCOR primes interferon-like responses and directly linked LCOR expression to tumor immunogenicity and immune checkpoint therapy responsiveness.\",\n      \"evidence\": \"Genetic overexpression/knockdown, ChIP at ISREs, flow cytometry for APM markers, in vivo tumor models with anti-PD-L1\",\n      \"pmids\": [\"35301507\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LCOR binds ISREs directly as a monomer or requires cofactors is unresolved\", \"Structural basis of LCOR-ISRE recognition unknown\", \"Whether PALI1 isoform also binds ISREs is not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating that LCOR interacts with RUNX1 to relieve RUNX1-mediated repression of PLCL1, inhibiting lipid accumulation and tumor progression in ccRCC, expanded LCOR's transcription factor partnership repertoire to include RUNX1.\",\n      \"evidence\": \"Co-IP, ChIP-qPCR, in vitro and in vivo functional assays in clear cell renal cell carcinoma models\",\n      \"pmids\": [\"40083699\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which LCOR relieves RUNX1 repression (competitive displacement versus complex remodeling) is not established\", \"Single study without independent replication\", \"Generalizability beyond ccRCC untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The relationship between LCOR's PRC2.1/PALI1 function and its nuclear receptor corepressor and ISRE-binding activities remains mechanistically unresolved, as does the structural basis for LCOR's context-dependent switching between corepressor and coactivator roles.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of full-length LCOR or its domains in complex with partners\", \"Isoform-specific functions (PALI1 versus shorter LCOR) not systematically dissected\", \"Genome-wide direct target map integrating all reported LCOR functions is lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 4, 6, 8, 10, 12, 13]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 3, 9, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0004839\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 4, 6, 8, 10, 12]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 12]}\n    ],\n    \"complexes\": [\n      \"PRC2.1\"\n    ],\n    \"partners\": [\n      \"HDAC3\",\n      \"HDAC6\",\n      \"CTBP1\",\n      \"NRIP1\",\n      \"KLF6\",\n      \"CEBPB\",\n      \"EZH2\",\n      \"RUNX1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}