{"gene":"TBL1XR1","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2003,"finding":"TBLR1 associates with N-CoR through two independent interactions: the N-terminal region of TBL1/TBLR1 interacts with the N-CoR RD1 region, and the C-terminal WD-40 repeats interact with the N-CoR RD4 region. In vitro, TBLR1 binds histones H2B and H4, and repression by TBLR1 correlates with histone interaction. siRNA knockdown demonstrated TBLR1 is functionally redundant with TBL1 but essential for repression by unliganded thyroid hormone receptor.","method":"Protein purification, Co-IP, in vitro histone-binding assays, siRNA knockdown with reporter gene readout","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (purification, Co-IP, in vitro binding, mutagenesis-equivalent siRNA) in a single rigorous study","pmids":["12628926"],"is_preprint":false},{"year":2008,"finding":"TBL1 and TBLR1 are required for Wnt/β-catenin-mediated transcription. Wnt signaling induces interaction between β-catenin and TBL1-TBLR1. Recruitment of TBL1-TBLR1 and β-catenin to Wnt target-gene promoters is mutually dependent. Depletion of TBL1-TBLR1 significantly inhibited Wnt-β-catenin-induced gene expression and oncogenic growth in vitro and in vivo.","method":"Co-IP, chromatin immunoprecipitation (ChIP), siRNA knockdown, in vitro and in vivo oncogenic growth assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ChIP, functional KD with multiple orthogonal readouts in vitro and in vivo","pmids":["18193033"],"is_preprint":false},{"year":2008,"finding":"TBL1 and TBLR1 function as exchange factors that license ubiquitylation and proteasomal degradation of CtBP1/2 and NCoR/SMRT corepressors, respectively, enabling transcriptional activation across multiple signaling pathways (Notch, NF-κB, nuclear receptor ligands). Their differential specificity resides in five specific Ser/Thr phosphorylation site differences; PKCδ directly phosphorylates TBLR1 at the promoter to enable NCoR dismissal.","method":"Phosphorylation site mutagenesis, kinase assays, ubiquitylation assays, ChIP, siRNA knockdown with gene-expression readouts","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of phosphorylation sites, kinase assays, ubiquitylation assays, and ChIP across multiple signaling contexts in a single rigorous study","pmids":["18374649"],"is_preprint":false},{"year":2004,"finding":"TBLR1 is recruited by unliganded thyroid hormone receptor (TR) to chromatinized target promoters in vivo, accompanied by histone deacetylation and gene repression. TBLR1, SMRT, and N-CoR are released from TR target promoters upon T3 treatment, which correlates with gene activation during amphibian metamorphosis.","method":"Frog oocyte system, chromatin immunoprecipitation (ChIP), in vivo interaction assays, dominant-negative N-CoR expression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo ChIP in two biological contexts (oocyte and metamorphosis), dominant-negative rescue, replicated across multiple target genes","pmids":["15060155"],"is_preprint":false},{"year":2003,"finding":"PML-RARα and PLZF-RARα oncoproteins recruit TBLR1 and N-CoR to their target promoters in chromatin, leading to histone deacetylation and transcriptional repression. Expression of a dominant-negative N-CoR containing the TBLR1-interacting domain blocked transcription repression by unliganded PML-RARα and PLZF-RARα.","method":"Frog oocyte chromatin system, Co-IP, chromatin immunoprecipitation (ChIP), dominant-negative expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo ChIP, Co-IP, and dominant-negative rescue across two oncoproteins with multiple orthogonal methods","pmids":["12794076"],"is_preprint":false},{"year":2011,"finding":"Both TBL1 and TBLR1 are SUMOylated in a Wnt signaling-dependent manner. SUMOylation dismisses TBL1-TBLR1 from the NCoR complex, increases formation of the TBL1-TBLR1-β-catenin complex at Wnt target gene promoters, and activates Wnt signaling. SENP1-mediated de-SUMOylation reverses this, inhibiting β-catenin-mediated transcription. Inhibition of SUMOylation decreased tumorigenicity of SW480 colon cancer cells.","method":"SUMOylation assays, Co-IP, ChIP, SENP1 overexpression/knockdown, cell-based tumorigenicity assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical SUMOylation assays, Co-IP, ChIP, and functional tumor growth assays with multiple orthogonal methods in a single study","pmids":["21777810"],"is_preprint":false},{"year":2017,"finding":"The crystal structure of the MeCP2 NID in complex with the WD40 domain of TBLR1 was determined. MeCP2 directly contacts TBLR1 (and TBL1) as core components of the NCoR/SMRT complex. The four MeCP2-NID residues mutated in Rett syndrome make the most extensive contacts with TBLR1. Missense mutations in TBL1XR1 associated with intellectual disability also prevent MeCP2 binding, confirmed by in vitro and ex vivo binding assays.","method":"Co-crystal structure determination, in vitro binding assays, ex vivo interaction assays, mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — co-crystal structure with functional validation by in vitro and ex vivo mutagenesis assays","pmids":["28348241"],"is_preprint":false},{"year":2006,"finding":"TBLR1 co-precipitates with SMRT and co-precipitates in complexes immunoprecipitated by anti-HDAC3 antiserum. In resting cells TBLR1 is primarily cytoplasmic, but after perturbation it translocates to the nucleus. Overexpression of TBLR1 or its deletion variants elevates endogenous N-CoR and SMRT levels, suggesting TBLR1 stabilizes corepressors against ubiquitin-mediated degradation. Transient overexpression of TBLR1 produces growth arrest.","method":"Co-immunoprecipitation, immunofluorescence localization, Western blot, overexpression of deletion variants","journal":"BMC cell biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP, subcellular localization, and overexpression results, single lab but multiple complementary methods","pmids":["16893456"],"is_preprint":false},{"year":2014,"finding":"TBL1XR1 knockdown in B-precursor ALL cell lines reduces glucocorticoid receptor (GR) recruitment to glucocorticoid-responsive gene chromatin and decreases glucocorticoid signaling, caused by increased levels of nuclear hormone repressor 1 (NCoR1) and HDAC3. This results in resistance to glucocorticoid agonists but not to other chemotherapeutic agents. HDAC inhibitor SAHA treatment restores prednisolone sensitivity in TBL1XR1-depleted cells.","method":"siRNA/shRNA knockdown, ChIP for GR recruitment, gene expression analysis, drug sensitivity assays, HDAC inhibitor rescue","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct chromatin recruitment defect, mechanistic rescue by HDAC inhibitor, multiple orthogonal methods in a single study","pmids":["24895125"],"is_preprint":false},{"year":2014,"finding":"TBLR1 physically interacts with androgen receptor (AR) and occupies androgen-response elements of AR target genes in an androgen-dependent manner, functioning as an AR coactivator. Coactivator activity is dependent on phosphorylation and the 19S proteasome. Stable nuclear TBLR1 expression causes androgen-dependent growth suppression of prostate cancer cells in vitro and in vivo by selectively activating differentiation- and growth-suppression-associated AR target genes (KRT18, NKX3-1) but not proliferative genes.","method":"Co-IP, ChIP, stable overexpression, in vitro and in vivo growth assays, gene expression profiling","journal":"Endocrine-related cancer","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, ChIP for direct promoter occupancy, and functional in vivo growth assays with multiple orthogonal methods","pmids":["24243687"],"is_preprint":false},{"year":2014,"finding":"The TBLR1-RARα fusion protein found in APL forms homodimers and heterodimers with RXRα and exhibits diminished transcriptional activity by recruiting more transcriptional corepressors compared with wild-type RARα. In the presence of pharmacological doses of ATRA, TBLR1-RARα is degraded, homodimerization is abrogated, and the fusion mediates dissociation and degradation of transcriptional corepressors, inducing transactivation of RARα target genes and cell differentiation.","method":"Co-IP (dimerization assays), reporter gene assays, Western blot (degradation), cell differentiation assays","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, functional transcription and differentiation assays, single lab, multiple methods","pmids":["24782508"],"is_preprint":false},{"year":2010,"finding":"TBLR1 functions as an E3 ubiquitin ligase responsible for BCL-3 polyubiquitination and degradation through a GSK3-independent pathway. Biochemical purification identified TBLR1 as a BCL-3-interacting protein involved in its proteasomal degradation.","method":"Biochemical purification, Co-IP, ubiquitination assays, degradation assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical purification and ubiquitination assays, single lab, multiple methods","pmids":["20547759"],"is_preprint":false},{"year":2016,"finding":"TBL1 and TBLR1 are SUMOylated in response to TNF-α treatment, increasing formation of a TBL1-TBLR1-NF-κB complex that leads to NF-κB-mediated transcriptional activation of cytokine genes. SENP1-mediated de-SUMOylation of TBL1 and TBLR1 dissociates them from the NCoR complex and inhibits NF-κB target gene expression. TBL1 knockdown suppresses inflammatory signaling and PC-3 prostate cancer cell proliferation.","method":"SUMOylation assays, Co-IP, gene expression analysis, siRNA knockdown, cell proliferation assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical SUMOylation assays, Co-IP, and functional knockdown, single lab, multiple methods","pmids":["27129164"],"is_preprint":false},{"year":2015,"finding":"SENP2-mediated de-SUMOylation of TBL1/TBLR1 inhibits nuclear translocation of β-catenin and suppresses MMP13 expression in bladder cancer cells. WNT ligands induce TBL1/TBLR1 SUMOylation to form complexes with β-catenin, facilitating β-catenin nuclear translocation, which can be blocked by inhibiting TBL1/TBLR1 SUMOylation.","method":"Co-IP, nuclear fractionation, Western blot, SENP2 knockdown/overexpression, luciferase reporter assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP, fractionation, functional reporter assays, single lab, multiple methods","pmids":["26369384"],"is_preprint":false},{"year":2017,"finding":"TBL1XR1 mutations found in ocular marginal zone lymphoma (within the WD40 domain) increase TBL1XR1 binding to NCoR, leading to increased NCoR degradation and activation of NF-κB and JUN target genes in 293T cells.","method":"Co-IP (TBL1XR1-NCoR interaction), transfection of mutant constructs into 293T cells, gene expression analysis","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and gene expression with mutant transfection, single lab, two methods","pmids":["28152507"],"is_preprint":false},{"year":2020,"finding":"TBL1XR1 mutations co-opt SMRT/HDAC3 repressor complexes toward binding the memory B cell transcription factor BACH2 at the expense of the germinal center TF BCL6, leading to pre-memory transcriptional reprogramming, impaired plasma cell differentiation, and extranodal immunoblastic lymphoma in mice. TBL1XR1 mutant memory B cells fail to differentiate into plasma cells upon antigen recall and preferentially re-enter germinal center reactions.","method":"Mouse genetic model (knock-in mutations), ChIP-seq for SMRT/HDAC3 binding, gene expression profiling, B cell differentiation assays in vitro and in vivo, lymphoma phenotyping","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq demonstrating genome-wide redistribution of repressor complexes, mouse knock-in model with defined phenotypic and molecular readouts, multiple orthogonal methods","pmids":["32619424"],"is_preprint":false},{"year":2017,"finding":"TBL1XR1 induces VEGF-C expression by directly binding to the VEGF-C promoter, thereby promoting lymphangiogenesis and lymphatic metastasis in esophageal squamous cell carcinoma. This was demonstrated by ChIP showing TBL1XR1 occupancy at the VEGF-C promoter, and luciferase reporter assays.","method":"ChIP, luciferase reporter assay, siRNA knockdown, in vitro invasion/tube formation assays, in vivo lymph node metastasis model","journal":"Gut","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct promoter binding, reporter assay, and in vivo functional assays, single lab, multiple methods","pmids":["24667177"],"is_preprint":false},{"year":2016,"finding":"The TBL1XR1 p.Tyr446Cys mutation causing Pierpont syndrome assembles correctly into the NCoR/SMRT complex, suggesting a dominant-negative mechanism rather than loss of complex assembly. This contrasts with loss-of-function mutations/deletions causing autism without the Pierpont phenotype.","method":"Protein expression and purification from HEK293 cells, complex assembly assay (co-immunoprecipitation with NCoR/SMRT components)","journal":"Journal of medical genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP/complex assembly assay, single lab; dominant-negative mechanism inferred from correct complex incorporation","pmids":["26769062"],"is_preprint":false},{"year":2017,"finding":"A de novo TBL1XR1 Phe10Leu mutation alters the interaction of TBL1XR1 with both N-CoR and β-catenin, and up-regulates TBL1XR1-mediated activation of Wnt signaling in cell-based assays.","method":"Co-IP (TBL1XR1 with N-CoR and β-catenin), Wnt reporter assays, protein structural analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and reporter assays with mutant protein, single lab, two orthogonal methods","pmids":["28588275"],"is_preprint":false},{"year":2020,"finding":"USP1 deubiquitinates and stabilizes TBLR1 (TBL1XR1), protecting it from proteasomal degradation. USP1-mediated stabilization of TBLR1 promotes Wnt signaling and the survival of hepatocellular carcinoma circulating tumor cells.","method":"Co-IP, ubiquitination assay, USP1 knockout, Western blot for TBLR1 protein stability","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP, ubiquitination assay, and genetic knockout with functional readout, single lab","pmids":["33102219"],"is_preprint":false},{"year":2017,"finding":"SLY interacts with TBL1XR1 in postmeiotic male germ cells, as demonstrated by co-immunoprecipitation. This interaction places TBL1XR1/SMRT-NCoR repressor complex members as regulators of gene expression during sperm differentiation.","method":"Co-immunoprecipitation from postmeiotic germ cells","journal":"Cell death and differentiation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP identifying interaction; functional consequence attributed primarily to SLY, not directly to TBL1XR1","pmids":["28475176"],"is_preprint":false},{"year":2021,"finding":"Tbl1xr1 knockout mice exhibit behavioral and neuronal abnormalities. Either absence of TBL1XR1 or point mutations interfering with NCOR complex stability/regulation causes decreased proliferation and increased differentiation in neural progenitors, attributed to failure in regulation of the MAPK cascade.","method":"Tbl1xr1 knockout mouse model, neural progenitor cell proliferation/differentiation assays, MAPK pathway analysis, behavioral testing","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout model with defined cellular and molecular phenotypes and pathway placement, single lab","pmids":["33708771"],"is_preprint":false},{"year":2022,"finding":"TBL1XR1 is a primary direct target of miR-130a identified by AGO2 CLIP. Loss of TBL1XR1 function phenocopies miR-130a overexpression, impairing B lymphoid differentiation and expanding long-term hematopoietic stem cells (HSCs). TBL1XR1 is critical for the oncogenic molecular program mediated by AML1-ETO in t(8;21) AML.","method":"AGO2 CLIP-seq, protein mass spectrometry, TBL1XR1 loss-of-function in primary human HSCs, miR-130a overexpression, gene expression profiling","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — AGO2 CLIP-seq for direct target identification, protein mass spectrometry, and loss-of-function with phenotypic readouts in primary cells, multiple orthogonal methods","pmids":["35263585"],"is_preprint":false}],"current_model":"TBL1XR1 (TBLR1) is a core WD40-repeat subunit of the NCoR/SMRT corepressor complex that binds N-CoR via dual domain interactions and contacts histones H2B/H4; it acts as a signal-responsive exchange factor whose Ser/Thr phosphorylation (e.g., by PKCδ) and SUMOylation state control whether it dismisses CtBP or NCoR/SMRT corepressors via ubiquitin-mediated degradation to enable transcriptional activation, directly interacts with MeCP2 (structural basis defined by co-crystal), recruits SMRT/HDAC3 to specific transcription factor loci to enforce B cell fate decisions, stabilizes NCoR/SMRT against degradation, is itself stabilized by USP1-mediated deubiquitination, and acts as a coactivator for androgen receptor through a phosphorylation- and 19S proteasome-dependent mechanism."},"narrative":{"mechanistic_narrative":"TBL1XR1 (TBLR1) is a core WD40-repeat subunit of the NCoR/SMRT transcriptional corepressor complex that converts ligand- and signal-dependent cues into transcriptional switching at chromatin [PMID:12628926, PMID:18374649]. It engages N-CoR through two independent contacts—an N-terminal interaction with the N-CoR RD1 region and a C-terminal WD40 interaction with RD4—and binds histones H2B and H4, with repression tracking its histone interaction [PMID:12628926]. Beyond serving as a structural scaffold, it functions as a signal-responsive exchange factor that licenses ubiquitin-dependent degradation of corepressors—dismissing NCoR/SMRT (while its paralog TBL1 acts on CtBP1/2)—to enable transcriptional activation across nuclear-receptor, Notch, and NF-κB pathways; this specificity is encoded by Ser/Thr phosphorylation sites, with PKCδ phosphorylating TBLR1 at the promoter to drive NCoR dismissal [PMID:18374649]. Wnt signaling redirects TBL1XR1 into a β-catenin complex required for Wnt target-gene transcription and oncogenic growth, a switch gated by SUMOylation that dissociates TBL1XR1 from NCoR and is reversed by SENP-family de-SUMOylation [PMID:18193033, PMID:21777810]. The protein's exchange-factor activity also operates on specific transcription factors: it is recruited by unliganded thyroid hormone receptor and by the PML-RARα/PLZF-RARα oncoproteins to enforce repression that is relieved by ligand [PMID:15060155, PMID:12794076], and it sustains glucocorticoid- and androgen-receptor signaling by controlling NCoR1/HDAC3 levels at responsive loci [PMID:24895125, PMID:24243687]. In B-cell biology, TBL1XR1 directs SMRT/HDAC3 to lineage transcription factors, and lymphoma-associated WD40 mutations co-opt these complexes from BCL6 toward BACH2 to drive pre-memory reprogramming and impaired plasma-cell differentiation [PMID:32619424]. A co-crystal structure defines its direct WD40-mediated binding to the MeCP2 NID, and intellectual-disability mutations in TBL1XR1 abolish this contact [PMID:28348241]. Germline TBL1XR1 mutations cause neurodevelopmental disease: a p.Tyr446Cys allele that assembles normally into NCoR/SMRT causes Pierpont syndrome via a dominant-negative mechanism, distinct from loss-of-function alleles associated with autism [PMID:26769062].","teleology":[{"year":2003,"claim":"Established TBL1XR1 as a histone-contacting NCoR-binding subunit, defining how it is physically wired into the corepressor machinery and why it is required for nuclear-receptor repression.","evidence":"Protein purification, Co-IP, in vitro histone-binding assays, and siRNA knockdown with reporter readout","pmids":["12628926"],"confidence":"High","gaps":["Histone binding shown in vitro; chromatin-level contribution at native loci not resolved","Redundancy with TBL1 leaves individual contribution ambiguous"]},{"year":2003,"claim":"Showed oncogenic fusion receptors exploit the TBLR1/N-CoR axis, linking the corepressor subunit to leukemic transcriptional silencing.","evidence":"Frog oocyte chromatin system, Co-IP, ChIP, and dominant-negative N-CoR expression with PML-RARα/PLZF-RARα","pmids":["12794076"],"confidence":"High","gaps":["Demonstrated in oocyte chromatin, not human leukemic cells","Did not address derepression dynamics in patients"]},{"year":2004,"claim":"Demonstrated ligand-dependent release of TBLR1/SMRT/N-CoR at thyroid-receptor promoters in vivo, establishing the corepressor-to-activator switch on physiological targets.","evidence":"ChIP and in vivo interaction assays in frog oocytes and during amphibian metamorphosis with dominant-negative N-CoR","pmids":["15060155"],"confidence":"High","gaps":["Mechanism of release not biochemically dissected here","Amphibian system; mammalian generality assumed"]},{"year":2008,"claim":"Identified TBL1XR1 as a signal-responsive exchange factor that licenses ubiquitin-mediated corepressor degradation, providing the core mechanistic model for how it enables activation, with phosphorylation encoding specificity.","evidence":"Phosphorylation-site mutagenesis, kinase assays, ubiquitylation assays, and ChIP across Notch/NF-κB/nuclear-receptor contexts","pmids":["18374649"],"confidence":"High","gaps":["Identity of the recruited ubiquitin ligase not fully defined","How phosphorylation discriminates CtBP vs NCoR targets at structural level unresolved"]},{"year":2008,"claim":"Placed TBL1XR1 in Wnt/β-catenin transcription, showing signal-induced β-catenin association and a requirement for Wnt-driven gene expression and oncogenic growth.","evidence":"Co-IP, ChIP, siRNA knockdown, and in vitro/in vivo oncogenic growth assays","pmids":["18193033"],"confidence":"High","gaps":["Did not yet explain how the NCoR-to-β-catenin switch is triggered","Direct vs indirect β-catenin contact unresolved"]},{"year":2011,"claim":"Defined SUMOylation as the molecular switch that releases TBL1XR1 from NCoR and recruits it to β-catenin, mechanistically connecting the 2008 Wnt and exchange-factor findings.","evidence":"SUMOylation assays, Co-IP, ChIP, SENP1 manipulation, and tumorigenicity assays in colon cancer cells","pmids":["21777810"],"confidence":"High","gaps":["SUMO E3 ligase not identified","Stoichiometry of SUMOylated vs unmodified pools unknown"]},{"year":2014,"claim":"Extended the corepressor-control role to therapy response, showing TBL1XR1 governs glucocorticoid-receptor recruitment by limiting NCoR1/HDAC3 and that loss drives glucocorticoid resistance reversible by HDAC inhibition.","evidence":"shRNA knockdown, GR ChIP, drug-sensitivity assays, and SAHA rescue in B-precursor ALL cells","pmids":["24895125"],"confidence":"High","gaps":["Whether resistance generalizes beyond B-ALL not tested","Did not define how TBL1XR1 sets steady-state NCoR1/HDAC3 levels"]},{"year":2014,"claim":"Showed TBL1XR1 can act as an androgen-receptor coactivator selecting differentiation over proliferation genes, demonstrating context-specific, gene-selective output.","evidence":"Co-IP, ChIP, stable overexpression, and in vitro/in vivo growth assays in prostate cancer","pmids":["24243687"],"confidence":"High","gaps":["Basis for selective activation of KRT18/NKX3-1 versus proliferative genes unresolved","Role of 19S proteasome dependence mechanistically undefined"]},{"year":2010,"claim":"Reported a direct E3-ligase-like activity for TBLR1 toward BCL-3, expanding its repertoire from exchange factor to a degradation effector.","evidence":"Biochemical purification, Co-IP, and ubiquitination/degradation assays","pmids":["20547759"],"confidence":"Medium","gaps":["Whether TBLR1 is a bona fide catalytic ligase or adaptor not fully distinguished","Single-lab finding without structural basis"]},{"year":2016,"claim":"Generalized the SUMO switch to inflammatory signaling, showing TNF-α-induced SUMOylation builds a TBL1-TBLR1-NF-κB activating complex reversed by SENP1.","evidence":"SUMOylation assays, Co-IP, gene-expression analysis, and knockdown in prostate cancer cells","pmids":["27129164"],"confidence":"Medium","gaps":["Functional readouts emphasized TBL1 over TBLR1","Direct TBLR1-NF-κB contact not structurally defined"]},{"year":2015,"claim":"Confirmed SUMO-dependent β-catenin nuclear translocation via TBL1/TBLR1 in a second cancer context and identified SENP2 as a reversing enzyme.","evidence":"Co-IP, nuclear fractionation, SENP2 manipulation, and luciferase reporter in bladder cancer cells","pmids":["26369384"],"confidence":"Medium","gaps":["Single-lineage findings","Mechanism of SUMO-driven nuclear shuttling not resolved"]},{"year":2017,"claim":"Provided atomic-resolution definition of TBL1XR1 WD40 binding to the MeCP2 NID and linked disease mutations on both proteins to disrupted contact.","evidence":"Co-crystal structure with in vitro and ex vivo mutagenesis binding assays","pmids":["28348241"],"confidence":"High","gaps":["Functional consequence of MeCP2 binding for specific gene programs not addressed","Did not test neuronal phenotypes of binding loss"]},{"year":2017,"claim":"Showed lymphoma WD40 mutations are gain-of-function for NCoR binding, increasing NCoR degradation and activating NF-κB/JUN targets, linking somatic mutation to aberrant activation.","evidence":"Co-IP and gene-expression analysis with mutant constructs in 293T cells","pmids":["28152507"],"confidence":"Medium","gaps":["Tested in 293T overexpression, not patient lymphoma cells","Genome-wide consequences not assessed"]},{"year":2017,"claim":"Demonstrated TBL1XR1 can act directly at a target promoter (VEGF-C) to drive lymphangiogenesis and metastasis, evidencing transcription-factor-like promoter occupancy.","evidence":"ChIP, luciferase reporter, knockdown, and in vivo metastasis model in esophageal carcinoma","pmids":["24667177"],"confidence":"Medium","gaps":["Direct DNA binding vs tethered recruitment not distinguished","Single tumor type"]},{"year":2016,"claim":"Distinguished disease mechanisms by showing the Pierpont-syndrome p.Tyr446Cys allele incorporates normally into NCoR/SMRT, implicating dominant-negative action rather than failed assembly.","evidence":"Protein expression and complex-assembly Co-IP from HEK293 cells","pmids":["26769062"],"confidence":"Medium","gaps":["Dominant-negative mechanism inferred, not directly demonstrated functionally","Single assembly assay"]},{"year":2017,"claim":"Showed a de novo neurodevelopmental allele (Phe10Leu) alters both N-CoR and β-catenin interactions and elevates Wnt signaling, connecting the N-terminal interaction surface to disease.","evidence":"Co-IP and Wnt reporter assays with mutant protein","pmids":["28588275"],"confidence":"Medium","gaps":["Cell-based reporter only","In vivo neurodevelopmental relevance not tested"]},{"year":2020,"claim":"Defined how lymphoma mutations rewire B-cell fate by redistributing SMRT/HDAC3 from BCL6 to BACH2, causing pre-memory reprogramming and lymphomagenesis in vivo.","evidence":"Mouse knock-in model, ChIP-seq, gene-expression profiling, and B-cell differentiation/lymphoma phenotyping","pmids":["32619424"],"confidence":"High","gaps":["Why mutant complexes prefer BACH2 over BCL6 mechanistically unresolved","Generalizability across lymphoma subtypes not established"]},{"year":2020,"claim":"Identified USP1 as a deubiquitinase that stabilizes TBL1XR1 protein, revealing post-translational control of its abundance that feeds Wnt-driven tumor-cell survival.","evidence":"Co-IP, ubiquitination assay, USP1 knockout, and protein-stability Western blots in hepatocellular carcinoma","pmids":["33102219"],"confidence":"Medium","gaps":["Ubiquitin ligase opposing USP1 not identified","Single-lineage functional context"]},{"year":2021,"claim":"Connected TBL1XR1/NCoR complex function to neurodevelopmental phenotypes mechanistically through MAPK-cascade regulation governing neural progenitor proliferation and differentiation.","evidence":"Tbl1xr1 knockout mouse with neural progenitor assays, MAPK pathway analysis, and behavioral testing","pmids":["33708771"],"confidence":"Medium","gaps":["How NCoR complex couples to MAPK output not biochemically defined","Behavioral-to-molecular causal chain incomplete"]},{"year":2022,"claim":"Placed TBL1XR1 as a direct miR-130a target whose loss expands HSCs and impairs B-lymphoid differentiation, implicating it in AML1-ETO leukemic programs.","evidence":"AGO2 CLIP-seq, mass spectrometry, and loss-of-function in primary human HSCs with miR-130a overexpression","pmids":["35263585"],"confidence":"High","gaps":["Downstream NCoR-complex targets in HSCs not mapped","Mechanism linking TBL1XR1 to AML1-ETO program undefined"]},{"year":null,"claim":"The structural rules that determine whether TBL1XR1 dismisses versus stabilizes corepressors—and how phosphorylation, SUMOylation, and mutations bias this choice between repression and activation at specific loci—remain incompletely defined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["The ubiquitin ligase(s) recruited during corepressor dismissal are unidentified","No unified structural model linking phospho/SUMO state to exchange-factor versus stabilizer behavior","Whether TBLR1 itself is catalytically a ligase or an adaptor remains unsettled"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,3,8,9,15,16]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,5,7]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[11]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,2,3,8,9,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,5,12]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,3,4,8,15]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[12,15,22]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,15,16,17]}],"complexes":["NCoR/SMRT corepressor complex"],"partners":["NCOR1","NCOR2","HDAC3","CTNNB1","MECP2","AR","NR3C1","BCL3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BZK7","full_name":"F-box-like/WD repeat-containing protein TBL1XR1","aliases":["Nuclear receptor corepressor/HDAC3 complex subunit TBLR1","TBL1-related protein 1","Transducin beta-like 1X-related protein 1"],"length_aa":514,"mass_kda":55.6,"function":"F-box-like protein involved in the recruitment of the ubiquitin/19S proteasome complex to nuclear receptor-regulated transcription units. Plays an essential role in transcription activation mediated by nuclear receptors. 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In vitro, TBLR1 binds histones H2B and H4, and repression by TBLR1 correlates with histone interaction. siRNA knockdown demonstrated TBLR1 is functionally redundant with TBL1 but essential for repression by unliganded thyroid hormone receptor.\",\n      \"method\": \"Protein purification, Co-IP, in vitro histone-binding assays, siRNA knockdown with reporter gene readout\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (purification, Co-IP, in vitro binding, mutagenesis-equivalent siRNA) in a single rigorous study\",\n      \"pmids\": [\"12628926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TBL1 and TBLR1 are required for Wnt/β-catenin-mediated transcription. Wnt signaling induces interaction between β-catenin and TBL1-TBLR1. Recruitment of TBL1-TBLR1 and β-catenin to Wnt target-gene promoters is mutually dependent. Depletion of TBL1-TBLR1 significantly inhibited Wnt-β-catenin-induced gene expression and oncogenic growth in vitro and in vivo.\",\n      \"method\": \"Co-IP, chromatin immunoprecipitation (ChIP), siRNA knockdown, in vitro and in vivo oncogenic growth assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ChIP, functional KD with multiple orthogonal readouts in vitro and in vivo\",\n      \"pmids\": [\"18193033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TBL1 and TBLR1 function as exchange factors that license ubiquitylation and proteasomal degradation of CtBP1/2 and NCoR/SMRT corepressors, respectively, enabling transcriptional activation across multiple signaling pathways (Notch, NF-κB, nuclear receptor ligands). Their differential specificity resides in five specific Ser/Thr phosphorylation site differences; PKCδ directly phosphorylates TBLR1 at the promoter to enable NCoR dismissal.\",\n      \"method\": \"Phosphorylation site mutagenesis, kinase assays, ubiquitylation assays, ChIP, siRNA knockdown with gene-expression readouts\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of phosphorylation sites, kinase assays, ubiquitylation assays, and ChIP across multiple signaling contexts in a single rigorous study\",\n      \"pmids\": [\"18374649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TBLR1 is recruited by unliganded thyroid hormone receptor (TR) to chromatinized target promoters in vivo, accompanied by histone deacetylation and gene repression. TBLR1, SMRT, and N-CoR are released from TR target promoters upon T3 treatment, which correlates with gene activation during amphibian metamorphosis.\",\n      \"method\": \"Frog oocyte system, chromatin immunoprecipitation (ChIP), in vivo interaction assays, dominant-negative N-CoR expression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo ChIP in two biological contexts (oocyte and metamorphosis), dominant-negative rescue, replicated across multiple target genes\",\n      \"pmids\": [\"15060155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PML-RARα and PLZF-RARα oncoproteins recruit TBLR1 and N-CoR to their target promoters in chromatin, leading to histone deacetylation and transcriptional repression. Expression of a dominant-negative N-CoR containing the TBLR1-interacting domain blocked transcription repression by unliganded PML-RARα and PLZF-RARα.\",\n      \"method\": \"Frog oocyte chromatin system, Co-IP, chromatin immunoprecipitation (ChIP), dominant-negative expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo ChIP, Co-IP, and dominant-negative rescue across two oncoproteins with multiple orthogonal methods\",\n      \"pmids\": [\"12794076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Both TBL1 and TBLR1 are SUMOylated in a Wnt signaling-dependent manner. SUMOylation dismisses TBL1-TBLR1 from the NCoR complex, increases formation of the TBL1-TBLR1-β-catenin complex at Wnt target gene promoters, and activates Wnt signaling. SENP1-mediated de-SUMOylation reverses this, inhibiting β-catenin-mediated transcription. Inhibition of SUMOylation decreased tumorigenicity of SW480 colon cancer cells.\",\n      \"method\": \"SUMOylation assays, Co-IP, ChIP, SENP1 overexpression/knockdown, cell-based tumorigenicity assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical SUMOylation assays, Co-IP, ChIP, and functional tumor growth assays with multiple orthogonal methods in a single study\",\n      \"pmids\": [\"21777810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The crystal structure of the MeCP2 NID in complex with the WD40 domain of TBLR1 was determined. MeCP2 directly contacts TBLR1 (and TBL1) as core components of the NCoR/SMRT complex. The four MeCP2-NID residues mutated in Rett syndrome make the most extensive contacts with TBLR1. Missense mutations in TBL1XR1 associated with intellectual disability also prevent MeCP2 binding, confirmed by in vitro and ex vivo binding assays.\",\n      \"method\": \"Co-crystal structure determination, in vitro binding assays, ex vivo interaction assays, mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — co-crystal structure with functional validation by in vitro and ex vivo mutagenesis assays\",\n      \"pmids\": [\"28348241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TBLR1 co-precipitates with SMRT and co-precipitates in complexes immunoprecipitated by anti-HDAC3 antiserum. In resting cells TBLR1 is primarily cytoplasmic, but after perturbation it translocates to the nucleus. Overexpression of TBLR1 or its deletion variants elevates endogenous N-CoR and SMRT levels, suggesting TBLR1 stabilizes corepressors against ubiquitin-mediated degradation. Transient overexpression of TBLR1 produces growth arrest.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence localization, Western blot, overexpression of deletion variants\",\n      \"journal\": \"BMC cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP, subcellular localization, and overexpression results, single lab but multiple complementary methods\",\n      \"pmids\": [\"16893456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TBL1XR1 knockdown in B-precursor ALL cell lines reduces glucocorticoid receptor (GR) recruitment to glucocorticoid-responsive gene chromatin and decreases glucocorticoid signaling, caused by increased levels of nuclear hormone repressor 1 (NCoR1) and HDAC3. This results in resistance to glucocorticoid agonists but not to other chemotherapeutic agents. HDAC inhibitor SAHA treatment restores prednisolone sensitivity in TBL1XR1-depleted cells.\",\n      \"method\": \"siRNA/shRNA knockdown, ChIP for GR recruitment, gene expression analysis, drug sensitivity assays, HDAC inhibitor rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct chromatin recruitment defect, mechanistic rescue by HDAC inhibitor, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"24895125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TBLR1 physically interacts with androgen receptor (AR) and occupies androgen-response elements of AR target genes in an androgen-dependent manner, functioning as an AR coactivator. Coactivator activity is dependent on phosphorylation and the 19S proteasome. Stable nuclear TBLR1 expression causes androgen-dependent growth suppression of prostate cancer cells in vitro and in vivo by selectively activating differentiation- and growth-suppression-associated AR target genes (KRT18, NKX3-1) but not proliferative genes.\",\n      \"method\": \"Co-IP, ChIP, stable overexpression, in vitro and in vivo growth assays, gene expression profiling\",\n      \"journal\": \"Endocrine-related cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, ChIP for direct promoter occupancy, and functional in vivo growth assays with multiple orthogonal methods\",\n      \"pmids\": [\"24243687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The TBLR1-RARα fusion protein found in APL forms homodimers and heterodimers with RXRα and exhibits diminished transcriptional activity by recruiting more transcriptional corepressors compared with wild-type RARα. In the presence of pharmacological doses of ATRA, TBLR1-RARα is degraded, homodimerization is abrogated, and the fusion mediates dissociation and degradation of transcriptional corepressors, inducing transactivation of RARα target genes and cell differentiation.\",\n      \"method\": \"Co-IP (dimerization assays), reporter gene assays, Western blot (degradation), cell differentiation assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, functional transcription and differentiation assays, single lab, multiple methods\",\n      \"pmids\": [\"24782508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TBLR1 functions as an E3 ubiquitin ligase responsible for BCL-3 polyubiquitination and degradation through a GSK3-independent pathway. Biochemical purification identified TBLR1 as a BCL-3-interacting protein involved in its proteasomal degradation.\",\n      \"method\": \"Biochemical purification, Co-IP, ubiquitination assays, degradation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical purification and ubiquitination assays, single lab, multiple methods\",\n      \"pmids\": [\"20547759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TBL1 and TBLR1 are SUMOylated in response to TNF-α treatment, increasing formation of a TBL1-TBLR1-NF-κB complex that leads to NF-κB-mediated transcriptional activation of cytokine genes. SENP1-mediated de-SUMOylation of TBL1 and TBLR1 dissociates them from the NCoR complex and inhibits NF-κB target gene expression. TBL1 knockdown suppresses inflammatory signaling and PC-3 prostate cancer cell proliferation.\",\n      \"method\": \"SUMOylation assays, Co-IP, gene expression analysis, siRNA knockdown, cell proliferation assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical SUMOylation assays, Co-IP, and functional knockdown, single lab, multiple methods\",\n      \"pmids\": [\"27129164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SENP2-mediated de-SUMOylation of TBL1/TBLR1 inhibits nuclear translocation of β-catenin and suppresses MMP13 expression in bladder cancer cells. WNT ligands induce TBL1/TBLR1 SUMOylation to form complexes with β-catenin, facilitating β-catenin nuclear translocation, which can be blocked by inhibiting TBL1/TBLR1 SUMOylation.\",\n      \"method\": \"Co-IP, nuclear fractionation, Western blot, SENP2 knockdown/overexpression, luciferase reporter assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP, fractionation, functional reporter assays, single lab, multiple methods\",\n      \"pmids\": [\"26369384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TBL1XR1 mutations found in ocular marginal zone lymphoma (within the WD40 domain) increase TBL1XR1 binding to NCoR, leading to increased NCoR degradation and activation of NF-κB and JUN target genes in 293T cells.\",\n      \"method\": \"Co-IP (TBL1XR1-NCoR interaction), transfection of mutant constructs into 293T cells, gene expression analysis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and gene expression with mutant transfection, single lab, two methods\",\n      \"pmids\": [\"28152507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TBL1XR1 mutations co-opt SMRT/HDAC3 repressor complexes toward binding the memory B cell transcription factor BACH2 at the expense of the germinal center TF BCL6, leading to pre-memory transcriptional reprogramming, impaired plasma cell differentiation, and extranodal immunoblastic lymphoma in mice. TBL1XR1 mutant memory B cells fail to differentiate into plasma cells upon antigen recall and preferentially re-enter germinal center reactions.\",\n      \"method\": \"Mouse genetic model (knock-in mutations), ChIP-seq for SMRT/HDAC3 binding, gene expression profiling, B cell differentiation assays in vitro and in vivo, lymphoma phenotyping\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq demonstrating genome-wide redistribution of repressor complexes, mouse knock-in model with defined phenotypic and molecular readouts, multiple orthogonal methods\",\n      \"pmids\": [\"32619424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TBL1XR1 induces VEGF-C expression by directly binding to the VEGF-C promoter, thereby promoting lymphangiogenesis and lymphatic metastasis in esophageal squamous cell carcinoma. This was demonstrated by ChIP showing TBL1XR1 occupancy at the VEGF-C promoter, and luciferase reporter assays.\",\n      \"method\": \"ChIP, luciferase reporter assay, siRNA knockdown, in vitro invasion/tube formation assays, in vivo lymph node metastasis model\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct promoter binding, reporter assay, and in vivo functional assays, single lab, multiple methods\",\n      \"pmids\": [\"24667177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The TBL1XR1 p.Tyr446Cys mutation causing Pierpont syndrome assembles correctly into the NCoR/SMRT complex, suggesting a dominant-negative mechanism rather than loss of complex assembly. This contrasts with loss-of-function mutations/deletions causing autism without the Pierpont phenotype.\",\n      \"method\": \"Protein expression and purification from HEK293 cells, complex assembly assay (co-immunoprecipitation with NCoR/SMRT components)\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP/complex assembly assay, single lab; dominant-negative mechanism inferred from correct complex incorporation\",\n      \"pmids\": [\"26769062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A de novo TBL1XR1 Phe10Leu mutation alters the interaction of TBL1XR1 with both N-CoR and β-catenin, and up-regulates TBL1XR1-mediated activation of Wnt signaling in cell-based assays.\",\n      \"method\": \"Co-IP (TBL1XR1 with N-CoR and β-catenin), Wnt reporter assays, protein structural analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and reporter assays with mutant protein, single lab, two orthogonal methods\",\n      \"pmids\": [\"28588275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP1 deubiquitinates and stabilizes TBLR1 (TBL1XR1), protecting it from proteasomal degradation. USP1-mediated stabilization of TBLR1 promotes Wnt signaling and the survival of hepatocellular carcinoma circulating tumor cells.\",\n      \"method\": \"Co-IP, ubiquitination assay, USP1 knockout, Western blot for TBLR1 protein stability\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP, ubiquitination assay, and genetic knockout with functional readout, single lab\",\n      \"pmids\": [\"33102219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SLY interacts with TBL1XR1 in postmeiotic male germ cells, as demonstrated by co-immunoprecipitation. This interaction places TBL1XR1/SMRT-NCoR repressor complex members as regulators of gene expression during sperm differentiation.\",\n      \"method\": \"Co-immunoprecipitation from postmeiotic germ cells\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP identifying interaction; functional consequence attributed primarily to SLY, not directly to TBL1XR1\",\n      \"pmids\": [\"28475176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Tbl1xr1 knockout mice exhibit behavioral and neuronal abnormalities. Either absence of TBL1XR1 or point mutations interfering with NCOR complex stability/regulation causes decreased proliferation and increased differentiation in neural progenitors, attributed to failure in regulation of the MAPK cascade.\",\n      \"method\": \"Tbl1xr1 knockout mouse model, neural progenitor cell proliferation/differentiation assays, MAPK pathway analysis, behavioral testing\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout model with defined cellular and molecular phenotypes and pathway placement, single lab\",\n      \"pmids\": [\"33708771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TBL1XR1 is a primary direct target of miR-130a identified by AGO2 CLIP. Loss of TBL1XR1 function phenocopies miR-130a overexpression, impairing B lymphoid differentiation and expanding long-term hematopoietic stem cells (HSCs). TBL1XR1 is critical for the oncogenic molecular program mediated by AML1-ETO in t(8;21) AML.\",\n      \"method\": \"AGO2 CLIP-seq, protein mass spectrometry, TBL1XR1 loss-of-function in primary human HSCs, miR-130a overexpression, gene expression profiling\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — AGO2 CLIP-seq for direct target identification, protein mass spectrometry, and loss-of-function with phenotypic readouts in primary cells, multiple orthogonal methods\",\n      \"pmids\": [\"35263585\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TBL1XR1 (TBLR1) is a core WD40-repeat subunit of the NCoR/SMRT corepressor complex that binds N-CoR via dual domain interactions and contacts histones H2B/H4; it acts as a signal-responsive exchange factor whose Ser/Thr phosphorylation (e.g., by PKCδ) and SUMOylation state control whether it dismisses CtBP or NCoR/SMRT corepressors via ubiquitin-mediated degradation to enable transcriptional activation, directly interacts with MeCP2 (structural basis defined by co-crystal), recruits SMRT/HDAC3 to specific transcription factor loci to enforce B cell fate decisions, stabilizes NCoR/SMRT against degradation, is itself stabilized by USP1-mediated deubiquitination, and acts as a coactivator for androgen receptor through a phosphorylation- and 19S proteasome-dependent mechanism.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TBL1XR1 (TBLR1) is a core WD40-repeat subunit of the NCoR/SMRT transcriptional corepressor complex that converts ligand- and signal-dependent cues into transcriptional switching at chromatin [#0, #2]. It engages N-CoR through two independent contacts—an N-terminal interaction with the N-CoR RD1 region and a C-terminal WD40 interaction with RD4—and binds histones H2B and H4, with repression tracking its histone interaction [#0]. Beyond serving as a structural scaffold, it functions as a signal-responsive exchange factor that licenses ubiquitin-dependent degradation of corepressors—dismissing NCoR/SMRT (while its paralog TBL1 acts on CtBP1/2)—to enable transcriptional activation across nuclear-receptor, Notch, and NF-\\u03baB pathways; this specificity is encoded by Ser/Thr phosphorylation sites, with PKC\\u03b4 phosphorylating TBLR1 at the promoter to drive NCoR dismissal [#2]. Wnt signaling redirects TBL1XR1 into a \\u03b2-catenin complex required for Wnt target-gene transcription and oncogenic growth, a switch gated by SUMOylation that dissociates TBL1XR1 from NCoR and is reversed by SENP-family de-SUMOylation [#1, #5]. The protein's exchange-factor activity also operates on specific transcription factors: it is recruited by unliganded thyroid hormone receptor and by the PML-RAR\\u03b1/PLZF-RAR\\u03b1 oncoproteins to enforce repression that is relieved by ligand [#3, #4], and it sustains glucocorticoid- and androgen-receptor signaling by controlling NCoR1/HDAC3 levels at responsive loci [#8, #9]. In B-cell biology, TBL1XR1 directs SMRT/HDAC3 to lineage transcription factors, and lymphoma-associated WD40 mutations co-opt these complexes from BCL6 toward BACH2 to drive pre-memory reprogramming and impaired plasma-cell differentiation [#15]. A co-crystal structure defines its direct WD40-mediated binding to the MeCP2 NID, and intellectual-disability mutations in TBL1XR1 abolish this contact [#6]. Germline TBL1XR1 mutations cause neurodevelopmental disease: a p.Tyr446Cys allele that assembles normally into NCoR/SMRT causes Pierpont syndrome via a dominant-negative mechanism, distinct from loss-of-function alleles associated with autism [#17].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established TBL1XR1 as a histone-contacting NCoR-binding subunit, defining how it is physically wired into the corepressor machinery and why it is required for nuclear-receptor repression.\",\n      \"evidence\": \"Protein purification, Co-IP, in vitro histone-binding assays, and siRNA knockdown with reporter readout\",\n      \"pmids\": [\"12628926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Histone binding shown in vitro; chromatin-level contribution at native loci not resolved\", \"Redundancy with TBL1 leaves individual contribution ambiguous\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed oncogenic fusion receptors exploit the TBLR1/N-CoR axis, linking the corepressor subunit to leukemic transcriptional silencing.\",\n      \"evidence\": \"Frog oocyte chromatin system, Co-IP, ChIP, and dominant-negative N-CoR expression with PML-RAR\\u03b1/PLZF-RAR\\u03b1\",\n      \"pmids\": [\"12794076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Demonstrated in oocyte chromatin, not human leukemic cells\", \"Did not address derepression dynamics in patients\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated ligand-dependent release of TBLR1/SMRT/N-CoR at thyroid-receptor promoters in vivo, establishing the corepressor-to-activator switch on physiological targets.\",\n      \"evidence\": \"ChIP and in vivo interaction assays in frog oocytes and during amphibian metamorphosis with dominant-negative N-CoR\",\n      \"pmids\": [\"15060155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of release not biochemically dissected here\", \"Amphibian system; mammalian generality assumed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified TBL1XR1 as a signal-responsive exchange factor that licenses ubiquitin-mediated corepressor degradation, providing the core mechanistic model for how it enables activation, with phosphorylation encoding specificity.\",\n      \"evidence\": \"Phosphorylation-site mutagenesis, kinase assays, ubiquitylation assays, and ChIP across Notch/NF-\\u03baB/nuclear-receptor contexts\",\n      \"pmids\": [\"18374649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the recruited ubiquitin ligase not fully defined\", \"How phosphorylation discriminates CtBP vs NCoR targets at structural level unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placed TBL1XR1 in Wnt/\\u03b2-catenin transcription, showing signal-induced \\u03b2-catenin association and a requirement for Wnt-driven gene expression and oncogenic growth.\",\n      \"evidence\": \"Co-IP, ChIP, siRNA knockdown, and in vitro/in vivo oncogenic growth assays\",\n      \"pmids\": [\"18193033\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not yet explain how the NCoR-to-\\u03b2-catenin switch is triggered\", \"Direct vs indirect \\u03b2-catenin contact unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined SUMOylation as the molecular switch that releases TBL1XR1 from NCoR and recruits it to \\u03b2-catenin, mechanistically connecting the 2008 Wnt and exchange-factor findings.\",\n      \"evidence\": \"SUMOylation assays, Co-IP, ChIP, SENP1 manipulation, and tumorigenicity assays in colon cancer cells\",\n      \"pmids\": [\"21777810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO E3 ligase not identified\", \"Stoichiometry of SUMOylated vs unmodified pools unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended the corepressor-control role to therapy response, showing TBL1XR1 governs glucocorticoid-receptor recruitment by limiting NCoR1/HDAC3 and that loss drives glucocorticoid resistance reversible by HDAC inhibition.\",\n      \"evidence\": \"shRNA knockdown, GR ChIP, drug-sensitivity assays, and SAHA rescue in B-precursor ALL cells\",\n      \"pmids\": [\"24895125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether resistance generalizes beyond B-ALL not tested\", \"Did not define how TBL1XR1 sets steady-state NCoR1/HDAC3 levels\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed TBL1XR1 can act as an androgen-receptor coactivator selecting differentiation over proliferation genes, demonstrating context-specific, gene-selective output.\",\n      \"evidence\": \"Co-IP, ChIP, stable overexpression, and in vitro/in vivo growth assays in prostate cancer\",\n      \"pmids\": [\"24243687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis for selective activation of KRT18/NKX3-1 versus proliferative genes unresolved\", \"Role of 19S proteasome dependence mechanistically undefined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Reported a direct E3-ligase-like activity for TBLR1 toward BCL-3, expanding its repertoire from exchange factor to a degradation effector.\",\n      \"evidence\": \"Biochemical purification, Co-IP, and ubiquitination/degradation assays\",\n      \"pmids\": [\"20547759\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TBLR1 is a bona fide catalytic ligase or adaptor not fully distinguished\", \"Single-lab finding without structural basis\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Generalized the SUMO switch to inflammatory signaling, showing TNF-\\u03b1-induced SUMOylation builds a TBL1-TBLR1-NF-\\u03baB activating complex reversed by SENP1.\",\n      \"evidence\": \"SUMOylation assays, Co-IP, gene-expression analysis, and knockdown in prostate cancer cells\",\n      \"pmids\": [\"27129164\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional readouts emphasized TBL1 over TBLR1\", \"Direct TBLR1-NF-\\u03baB contact not structurally defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Confirmed SUMO-dependent \\u03b2-catenin nuclear translocation via TBL1/TBLR1 in a second cancer context and identified SENP2 as a reversing enzyme.\",\n      \"evidence\": \"Co-IP, nuclear fractionation, SENP2 manipulation, and luciferase reporter in bladder cancer cells\",\n      \"pmids\": [\"26369384\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lineage findings\", \"Mechanism of SUMO-driven nuclear shuttling not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided atomic-resolution definition of TBL1XR1 WD40 binding to the MeCP2 NID and linked disease mutations on both proteins to disrupted contact.\",\n      \"evidence\": \"Co-crystal structure with in vitro and ex vivo mutagenesis binding assays\",\n      \"pmids\": [\"28348241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of MeCP2 binding for specific gene programs not addressed\", \"Did not test neuronal phenotypes of binding loss\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed lymphoma WD40 mutations are gain-of-function for NCoR binding, increasing NCoR degradation and activating NF-\\u03baB/JUN targets, linking somatic mutation to aberrant activation.\",\n      \"evidence\": \"Co-IP and gene-expression analysis with mutant constructs in 293T cells\",\n      \"pmids\": [\"28152507\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tested in 293T overexpression, not patient lymphoma cells\", \"Genome-wide consequences not assessed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated TBL1XR1 can act directly at a target promoter (VEGF-C) to drive lymphangiogenesis and metastasis, evidencing transcription-factor-like promoter occupancy.\",\n      \"evidence\": \"ChIP, luciferase reporter, knockdown, and in vivo metastasis model in esophageal carcinoma\",\n      \"pmids\": [\"24667177\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DNA binding vs tethered recruitment not distinguished\", \"Single tumor type\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Distinguished disease mechanisms by showing the Pierpont-syndrome p.Tyr446Cys allele incorporates normally into NCoR/SMRT, implicating dominant-negative action rather than failed assembly.\",\n      \"evidence\": \"Protein expression and complex-assembly Co-IP from HEK293 cells\",\n      \"pmids\": [\"26769062\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dominant-negative mechanism inferred, not directly demonstrated functionally\", \"Single assembly assay\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed a de novo neurodevelopmental allele (Phe10Leu) alters both N-CoR and \\u03b2-catenin interactions and elevates Wnt signaling, connecting the N-terminal interaction surface to disease.\",\n      \"evidence\": \"Co-IP and Wnt reporter assays with mutant protein\",\n      \"pmids\": [\"28588275\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-based reporter only\", \"In vivo neurodevelopmental relevance not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined how lymphoma mutations rewire B-cell fate by redistributing SMRT/HDAC3 from BCL6 to BACH2, causing pre-memory reprogramming and lymphomagenesis in vivo.\",\n      \"evidence\": \"Mouse knock-in model, ChIP-seq, gene-expression profiling, and B-cell differentiation/lymphoma phenotyping\",\n      \"pmids\": [\"32619424\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why mutant complexes prefer BACH2 over BCL6 mechanistically unresolved\", \"Generalizability across lymphoma subtypes not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified USP1 as a deubiquitinase that stabilizes TBL1XR1 protein, revealing post-translational control of its abundance that feeds Wnt-driven tumor-cell survival.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, USP1 knockout, and protein-stability Western blots in hepatocellular carcinoma\",\n      \"pmids\": [\"33102219\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin ligase opposing USP1 not identified\", \"Single-lineage functional context\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected TBL1XR1/NCoR complex function to neurodevelopmental phenotypes mechanistically through MAPK-cascade regulation governing neural progenitor proliferation and differentiation.\",\n      \"evidence\": \"Tbl1xr1 knockout mouse with neural progenitor assays, MAPK pathway analysis, and behavioral testing\",\n      \"pmids\": [\"33708771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How NCoR complex couples to MAPK output not biochemically defined\", \"Behavioral-to-molecular causal chain incomplete\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placed TBL1XR1 as a direct miR-130a target whose loss expands HSCs and impairs B-lymphoid differentiation, implicating it in AML1-ETO leukemic programs.\",\n      \"evidence\": \"AGO2 CLIP-seq, mass spectrometry, and loss-of-function in primary human HSCs with miR-130a overexpression\",\n      \"pmids\": [\"35263585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream NCoR-complex targets in HSCs not mapped\", \"Mechanism linking TBL1XR1 to AML1-ETO program undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural rules that determine whether TBL1XR1 dismisses versus stabilizes corepressors—and how phosphorylation, SUMOylation, and mutations bias this choice between repression and activation at specific loci—remain incompletely defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The ubiquitin ligase(s) recruited during corepressor dismissal are unidentified\", \"No unified structural model linking phospho/SUMO state to exchange-factor versus stabilizer behavior\", \"Whether TBLR1 itself is catalytically a ligase or an adaptor remains unsettled\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 3, 8, 9, 15, 16]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5, 7]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 2, 3, 8, 9, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 5, 12]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 3, 4, 8, 15]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12, 15, 22]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 15, 16, 17]}\n    ],\n    \"complexes\": [\"NCoR/SMRT corepressor complex\"],\n    \"partners\": [\"NCOR1\", \"NCOR2\", \"HDAC3\", \"CTNNB1\", \"MECP2\", \"AR\", \"NR3C1\", \"BCL3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}