{"gene":"TBL1X","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2001,"finding":"TBL1X (mammalian homolog of Drosophila Ebi) participates in a novel beta-catenin degradation pathway: Siah binds ubiquitin-conjugating enzymes, and Ebi (an F-box protein homologous to TBL1X) binds beta-catenin independently of the phosphorylation sites recognized by beta-TrCP. Ebi is physically linked to Siah via SIP (an Sgt1 homolog that binds Skp1), forming an SCF-like complex that targets beta-catenin for degradation downstream of p53-induced Siah expression.","method":"Co-immunoprecipitation, protein interaction mapping, beta-catenin degradation assay, epistasis with p53/Siah pathway","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and functional degradation assay in single lab; Ebi is the Drosophila ortholog and direct mammalian TBL1X homolog context established","pmids":["11389839"],"is_preprint":false},{"year":2002,"finding":"Drosophila Ebi (ortholog of TBL1X) forms a complex with Su(H) and the corepressor SMRTER; EGFR signaling promotes transcriptional derepression by causing translocation of SMRTER to the cytoplasm in a proteasome-dependent manner, thereby enabling Delta expression in photoreceptor cells.","method":"Co-immunoprecipitation, genetic epistasis (EGFR/ebi/sno pathway), proteasome inhibition, subcellular localization imaging","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic epistasis, proteasome dependency, and localization data in one study; replicated mechanistic framework across multiple Drosophila papers","pmids":["12230979"],"is_preprint":false},{"year":1999,"finding":"Drosophila Ebi (ortholog of TBL1X) regulates EGFR signaling at multiple steps and promotes EGFR-dependent down-regulation of Tramtrack88 (a repressor of neuronal development). Ebi encodes an evolutionarily conserved protein with an F-box-like domain and six WD40 repeats; proteins with related structures regulate protein degradation.","method":"Genetic analysis (loss-of-function mutations, genetic interaction with Egfr), developmental phenotype, protein domain analysis","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis and developmental phenotype in single lab; Tramtrack88 downregulation shown but biochemical mechanism not fully reconstituted in this paper","pmids":["10215623"],"is_preprint":false},{"year":2000,"finding":"Drosophila Ebi (ortholog of TBL1X) physically interacts with Sina and phyllopod, and promotes Ttk88 (Tramtrack88) degradation in vitro and in S2 cells. Ebi has two distinct functions: promotion of Ttk88 degradation (enabling neuronal differentiation) and a second independent function limiting S-phase entry in the nervous system.","method":"Co-immunoprecipitation (physical interaction with Sina and phyllopod), in vitro degradation assay, S2 cell degradation assay, loss-of-function genetic analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro degradation assay plus Co-IP plus cell-based assay, combined with genetic evidence of two independent functions","pmids":["11032805"],"is_preprint":false},{"year":2006,"finding":"The Drosophila Ebi/SMRTER corepressor complex represses transcription of charlatan (chn), an NRSF/REST-like zinc-finger gene, by competing with the Notch intracellular domain (NICD) activation complex at the chn promoter. This double-negative regulation (Ebi/SMRTER represses chn; chn represses Delta) maintains Delta expression and inductive activity in photoreceptor cells under EGF signaling.","method":"Genetic epistasis, loss-of-function analysis, transcriptional reporter assays, identification of Ebi/SMRTER complex at chn promoter","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with functional reporter assays in single lab; complex mechanism established through multiple genetic interactions","pmids":["16763555"],"is_preprint":false},{"year":2008,"finding":"Drosophila Ebi (ortholog of TBL1X) acts as an essential co-repressor for Snail-mediated transcriptional repression in mesoderm formation. Ebi and Snail interact physically (a conserved Snail domain binds Ebi independently of CtBP). The mammalian Ebi homolog TBL1 is part of the NCoR/SMRT-HDAC3 co-repressor complex, and Ebi interacts with Drosophila HDAC3. Ebi is recruited to Snail target genes in a Snail-dependent manner, correlating with histone hypoacetylation. HDAC3 knockdown or HDAC inhibitor impairs Snail-mediated repression.","method":"Co-immunoprecipitation (Ebi-Snail physical interaction), chromatin immunoprecipitation (ChIP), HDAC3 RNAi knockdown, HDAC inhibitor treatment, transgenic embryo rescue, histone acetylation assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP, Co-IP, RNAi, pharmacological inhibition, and transgenic rescue in one study; establishes TBL1 as part of NCoR/SMRT-HDAC3 complex with histone deacetylation as mechanism","pmids":["18309295"],"is_preprint":false},{"year":2012,"finding":"Drosophila Ebi (ortholog of TBL1X) forms a complex with activator protein 1 (AP-1) and is required for repression of pro-apoptotic and anti-apoptotic gene expression in photoreceptor neurons. Loss of ebi causes late-onset neuronal apoptosis and increased sensitivity to oxidative stress.","method":"Co-immunoprecipitation (Ebi-AP-1 complex), loss-of-function genetic analysis, survival assay, oxidative stress assay, gene expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and loss-of-function with defined phenotypic readout in single lab","pmids":["22666340"],"is_preprint":false},{"year":2013,"finding":"Drosophila Ebi (ortholog of TBL1X) forms a complex with retinoblastoma family protein (RBF) and regulates expression of specific Rbf/E2F pathway target genes, acting as a corepressor to mitigate excess growth signaling. Ebi also sustains expression of Rbf itself. Genetic analysis shows antagonism between Ebi and the Polycomb group silencing complex in regulating the G1/S phase transition.","method":"Co-immunoprecipitation (Ebi-RBF complex), genetic epistasis (Polycomb group), gene expression analysis, loss-of-function alleles","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and genetic epistasis in single lab; multiple pathway interactions assessed","pmids":["23919509"],"is_preprint":false},{"year":2016,"finding":"TBL1X mutations (in the conserved WD40-repeat domain) are associated with central hypothyroidism. In vitro studies showed mutations influence TBL1X protein expression and thermal stability. TBL1X mRNA and protein are expressed in human hypothalamus and pituitary, consistent with its role in the thyroid hormone receptor-corepressor complex (NCoR/SMRT) regulating TSH and thyroid hormone signaling.","method":"Sanger sequencing, in vitro functional assay (expression and thermal stability of mutant proteins), immunostaining of human hypothalamus and pituitary, mRNA expression analysis","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro functional assays plus human tissue expression; multiple mutations across multiple families but functional assays limited to expression/stability","pmids":["27603907"],"is_preprint":false},{"year":2016,"finding":"Drosophila Ebi (TBL1X ortholog) regulates wing growth by ubiquitin-dependent downregulation of the transmembrane protein Crumbs (Crb). Ebi physically binds the extracellular domain of Crb, with the interaction mediated specifically by WD40 repeats 7-8 of Ebi and a laminin G domain of Crb. Ebi knockdown elevates Crb protein levels at the dorsoventral boundary.","method":"Co-immunoprecipitation (Ebi-Crb physical interaction, domain mapping), genetic suppression assays, immunofluorescence (Crb protein levels), ubiquitylation assay","journal":"Development","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct Co-IP with domain mapping, ubiquitylation assay, genetic suppression, and in vivo protein level changes in one study","pmids":["27702784"],"is_preprint":false},{"year":2005,"finding":"TBL1X (and its homolog TBLR1) acts as a corepressor/coactivator exchanger for nuclear receptors and transcription factors. GAL4-DBD fusion protein experiments showed TBL1X represses promoter activity in luciferase assays, whereas the Y-linked homolog TBL1Y did not repress promoter activity.","method":"GAL4-DBD fusion protein expression, dual luciferase reporter assay, RT-PCR expression analysis","journal":"Journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — luciferase reporter assay demonstrates repressor activity of TBL1X; single lab, single method for functional claim","pmids":["15834507"],"is_preprint":false},{"year":2022,"finding":"TBL1X is required for regulation of major transcriptional programs through the SMRT/NCoR/BCL6 complex, Wnt/β-catenin, and NF-κB signaling. In DLBCL, genetic knockdown of TBL1X and treatment with tegavivint (targeting the TBL1X N-terminus) results in decreased expression of critical oncoproteins in a posttranscriptional/β-catenin-independent manner by promoting proteasomal degradation through a Skp1/Cul1/F-box (SCF)/TBL1X supercomplex.","method":"Genetic knockdown (siRNA/shRNA), small molecule treatment (tegavivint), proteasomal degradation assay, co-immunoprecipitation (SCF/TBL1X supercomplex)","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional KD plus Co-IP for complex identification in single lab; review article summarizing original experimental findings from the same group","pmids":["36206873"],"is_preprint":false},{"year":2023,"finding":"TBL1X is recruited by lncRNA MIAT to ubiquitinate and downregulate TP53 protein in prostate adenocarcinoma cells, thereby promoting immune evasion. Silencing of TP53 or overexpression of TBL1X abrogated tumor-suppressive effects of MIAT knockdown in vitro and in vivo.","method":"RNA pulldown/Co-IP (MIAT-TBL1X interaction), ubiquitination assay, genetic knockdown and overexpression, in vitro and in vivo rescue experiments","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay plus rescue experiments; single lab with multiple methods establishing TBL1X as TP53 ubiquitination mediator","pmids":["37356458"],"is_preprint":false},{"year":2024,"finding":"PPM1G promotes production of an exon-6-skipping splice variant of TBL1X (TBL1X-S) in hepatocellular carcinoma by prolonging the half-life of the TBL1X-S transcript. TBL1X-S shows significantly enhanced binding affinity for ZEB1 compared to full-length TBL1X, resulting in ZEB1 activation, CDH1 repression, and acceleration of epithelial-mesenchymal transition (EMT). PPM1G-driven metastasis is partially dependent on TBL1X-S.","method":"RNA sequencing, mRNA stability assay (half-life measurement), Co-immunoprecipitation (TBL1X variant-ZEB1 interaction), transcriptional reporter (CDH1 promoter), overexpression/knockdown with metastasis phenotype readout","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for differential binding, mRNA stability assay, and functional rescue; single lab, multiple orthogonal methods","pmids":["39462759"],"is_preprint":false},{"year":2025,"finding":"TBL1X controls the stability of the MCL oncogenic drivers cyclin D1 and RAD51 in mantle cell lymphoma cells. Genetic knockdown of TBL1X or treatment with tegavivint (targeting TBL1X N-terminus) results in significant DNA damage, cell cycle arrest, and cell death in vitro and in vivo. Combining tegavivint with the PARP1/2 inhibitor talazoparib results in synergistic MCL cell death, consistent with TBL1X maintaining genomic stability.","method":"Genetic knockdown (shRNA), small molecule treatment (tegavivint), western blot (cyclin D1/RAD51 protein stability), DNA damage assay (γH2AX), cell cycle analysis, in vivo patient-derived xenograft model, synergy assay","journal":"Blood advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined protein stability and DNA damage readouts, in vivo validation; single lab with multiple orthogonal methods","pmids":["40009753"],"is_preprint":false},{"year":2024,"finding":"TBL1X degraders (PROTACs) targeting TBL1X can selectively reduce TBL1X protein levels via proteasomal degradation in DLBCL cells. TBL1X degradation by the PROTAC TD11 is dependent on ternary complex formation and the proteasome. O-linked PROTACs achieved significant TBL1X degradation while N-linked PROTACs showed minimal degradation, indicating the linker attachment site is critical for effective degradation.","method":"PROTAC synthesis, western blot (TBL1X protein levels), proteasome inhibition (competition assay), ternary complex formation assay, cytotoxicity assay","journal":"ACS medicinal chemistry letters","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct proteasome-dependent degradation shown with mechanistic controls; single lab proof-of-concept study","pmids":["39411529"],"is_preprint":false},{"year":2018,"finding":"miR-138-5p inhibits migration and proliferation of trophoblast cells (HTR-8/SVneo) by directly targeting the 3'-UTR of TBL1X, as confirmed by luciferase assay. TBL1X expression was inversely correlated with miR-138-5p in GDM placentas.","method":"Luciferase reporter assay (3'-UTR targeting), wound healing assay, transwell migration assay, CCK8 proliferation assay","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR luciferase validation plus functional cellular assays; single lab with two orthogonal methods","pmids":["30463081"],"is_preprint":false},{"year":2022,"finding":"TBL1X interacts with TCF4 to trans-activate Flotillin-2 (Flot2) expression in nasopharyngeal carcinoma. TBL1X promotes NPC cell migration and invasion through Flot2 both in vitro and in vivo. Flot2 reciprocally increases TBL1X expression by upregulating c-Myc, which was identified as a positive regulatory transcription factor of TBL1X.","method":"Co-immunoprecipitation (TBL1X-TCF4 interaction), luciferase reporter (Flot2 promoter), knockdown/overexpression with migration/invasion assays, in vivo metastasis model, ChIP (c-Myc on TBL1X promoter)","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, reporter assay, ChIP, and functional rescue in single lab; multiple orthogonal methods","pmids":["35173544"],"is_preprint":false},{"year":2018,"finding":"TBL1X is part of the NCoR-SMRT corepressor complex involved in repression of thyroid hormone action in the pituitary and hypothalamus. A hemizygous truncating TBL1X mutation [p.Arg339Ter] largely truncating the WD-40 repeat domain causes central hypothyroidism, consistent with loss of nuclear protein-protein interactions mediated by the WD-40 domain.","method":"Next-generation sequencing, clinical biochemistry (FT4/TSH), TRH test, audiometry, brain MRI; loss-of-function mutation characterization","journal":"Journal of the Endocrine Society","confidence":"Low","confidence_rationale":"Tier 3 / Weak — human genetic loss-of-function with defined phenotype but no direct in vitro mechanistic assay for this specific mutation beyond clinical characterization","pmids":["30591955"],"is_preprint":false},{"year":2026,"finding":"Genetic double deletion of TBL1X/TBL1XR1 in CD4+ T cells leads to a shift from naive to effector and Foxp3+ Treg cells, enhanced cytokine production upon stimulation, and induction of pro-inflammatory transcriptional pathways. Transplantation of TBL1X/TBL1XR1-deficient CD4+ T cell bone marrow doubled atherosclerotic plaque development in LDLR KO recipients compared to wild-type, establishing TBL1X as a co-factor restraining CD4+ T cell pro-inflammatory activity.","method":"Conditional knockout (CD4-Cre), bone marrow transplantation, flow cytometry (T cell phenotyping), cytokine stimulation assay (ionomycin/PMA), single-cell RNA sequencing, scRNA-seq of human carotid plaques","journal":"Molecular metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined cellular phenotype and in vivo atherosclerosis model; single study with multiple orthogonal methods","pmids":["41539423"],"is_preprint":false},{"year":2026,"finding":"TBL1X and TBL1XR1 directly regulate insulin promoter activity through a PAX6-HDAC3 gene regulatory network in pancreatic beta cells. Beta-cell-specific TBL1/R1 knockout in mice leads to progressive hypoinsulinemia, hyperglycemia, loss of beta-cell identity (scRNA-seq shows emergence of polyhormonal cells), and reduced beta-cell maturity. TBL1/R1 interactome screens and ChIP confirm direct association with the insulin promoter and PAX6-HDAC3 complex.","method":"Beta-cell-specific conditional knockout (mouse), scRNA-seq, interactome screen (Co-IP/MS), chromatin immunoprecipitation (ChIP), luciferase reporter (insulin promoter), human beta-cell model validation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — conditional KO phenotype, ChIP, interactome screen, reporter assay, and human model validation; multiple orthogonal methods in single rigorous study","pmids":["42020373"],"is_preprint":false}],"current_model":"TBL1X is an adaptor/scaffold subunit of the NCoR/SMRT-HDAC3 transcriptional co-repressor complex that, through its WD40-repeat domain, mediates protein-protein interactions with nuclear receptors (including thyroid hormone receptor), transcription factors (PAX6, Snail, TCF4, AP-1, Su(H)/SMRTER), and ubiquitin-ligase machinery (SCF complexes); it regulates gene expression by facilitating histone deacetylation at target promoters, acts as a corepressor/coactivator exchange factor, and can also promote ubiquitin-proteasome-dependent degradation of specific substrates (beta-catenin, Tramtrack88, TP53, cyclin D1, RAD51), with loss-of-function causing central hypothyroidism and sensorineural deafness due to impaired thyroid hormone signaling in the pituitary and hypothalamus."},"narrative":{"mechanistic_narrative":"TBL1X is a WD40-repeat scaffold/adaptor subunit of the NCoR/SMRT-HDAC3 transcriptional co-repressor complex that controls developmental and metabolic gene programs by coupling sequence-specific transcription factors to histone deacetylation and to the ubiquitin-proteasome system [PMID:18309295, PMID:42020373]. In its corepressor role it is recruited to target promoters by transcription factors such as Snail, where it bridges to HDAC3 and drives histone hypoacetylation [PMID:18309295], and it functions as a corepressor/coactivator exchange factor for nuclear receptors and transcription factors [PMID:15834507]. Studies of the Drosophila ortholog Ebi established a parallel function as a substrate-recognition component of SCF-like (Skp1/Cul1/F-box) ubiquitin-ligase complexes that target proteins for degradation, including beta-catenin and the neuronal repressor Tramtrack88 (Ttk88) via Sina/phyllopod, thereby controlling EGFR-dependent photoreceptor differentiation and cell-cycle entry [PMID:11389839, PMID:11032805, PMID:10215623]. Through these dual scaffolding activities TBL1X integrates Notch, EGFR, and AP-1 signaling to maintain correct patterns of gene expression and neuronal survival [PMID:12230979, PMID:16763555, PMID:22666340]. In mammalian disease contexts the same SCF/TBL1X supercomplex promotes proteasomal degradation of oncoproteins, and TBL1X controls the stability of cyclin D1, RAD51, and TP53 and the transcriptional output of TCF4 and ZEB1 in several cancers [PMID:36206873, PMID:40009753, PMID:35173544, PMID:39462759]. Genetically, TBL1X serves as a co-factor for the PAX6-HDAC3 network governing insulin promoter activity and beta-cell identity [PMID:42020373] and restrains pro-inflammatory CD4+ T cell activity [PMID:41539423]. Loss-of-function mutations truncating or destabilizing the WD40-repeat domain cause central hypothyroidism through impaired thyroid hormone receptor-corepressor signaling in the pituitary and hypothalamus [PMID:27603907].","teleology":[{"year":1999,"claim":"Established that the TBL1X ortholog Ebi is a conserved WD40/F-box-like protein acting in EGFR signaling to downregulate a transcriptional repressor, framing TBL1X-family proteins as candidate degradation adaptors.","evidence":"Loss-of-function genetics and Egfr genetic interaction in Drosophila, with domain analysis showing six WD40 repeats and an F-box-like motif","pmids":["10215623"],"confidence":"Medium","gaps":["Biochemical mechanism of Ttk88 downregulation not reconstituted","Direct physical partners not identified in this study"]},{"year":2000,"claim":"Defined Ebi as a substrate-recognition adaptor that promotes ubiquitin-dependent degradation, resolving how it links signaling to protein turnover and neuronal differentiation.","evidence":"Co-IP with Sina and phyllopod, in vitro and S2-cell Ttk88 degradation assays, and loss-of-function genetics in Drosophila","pmids":["11032805"],"confidence":"High","gaps":["Mechanism of the separate S-phase-limiting function unresolved","E3 composition not fully defined"]},{"year":2001,"claim":"Extended the degradation-adaptor role to the mammalian context by showing the Ebi/TBL1X homolog targets beta-catenin via an SCF-like Siah/SIP/Skp1 complex downstream of p53.","evidence":"Co-IP, interaction mapping, and beta-catenin degradation assays with p53/Siah epistasis","pmids":["11389839"],"confidence":"Medium","gaps":["Direct demonstration with human TBL1X protein limited","Phosphorylation-independence of beta-catenin recognition not structurally explained"]},{"year":2002,"claim":"Connected Ebi to corepressor biology by showing it complexes with Su(H) and SMRTER and that EGFR signaling drives proteasome-dependent SMRTER relocalization to derepress targets.","evidence":"Co-IP, genetic epistasis, proteasome inhibition, and subcellular localization in Drosophila photoreceptors","pmids":["12230979"],"confidence":"High","gaps":["Mammalian equivalence of the Su(H)/SMRTER step not tested","Whether TBL1X mediates SMRTER turnover directly unclear"]},{"year":2006,"claim":"Showed the Ebi/SMRTER corepressor complex competes with Notch activation at a specific promoter, establishing TBL1X-family proteins in promoter-level repression logic during patterning.","evidence":"Genetic epistasis, loss-of-function analysis, and reporter assays identifying the complex at the chn promoter","pmids":["16763555"],"confidence":"Medium","gaps":["Direct DNA/factor contacts of TBL1X not mapped","Mammalian conservation of this regulatory circuit untested"]},{"year":2005,"claim":"Demonstrated that human TBL1X is a transcriptional repressor and corepressor/coactivator exchange factor, distinguishing it functionally from the non-repressing TBL1Y homolog.","evidence":"GAL4-DBD fusion luciferase reporter assays and RT-PCR expression analysis","pmids":["15834507"],"confidence":"Medium","gaps":["Single reporter-based assay for the functional claim","Endogenous target genes not identified"]},{"year":2008,"claim":"Established the canonical mechanism: TBL1X/Ebi is recruited by a sequence-specific repressor (Snail) and acts through the NCoR/SMRT-HDAC3 complex to drive histone deacetylation at target genes.","evidence":"Co-IP, ChIP, HDAC3 RNAi, HDAC inhibitor treatment, and transgenic embryo rescue in Drosophila","pmids":["18309295"],"confidence":"High","gaps":["Whether TBL1X is required for complex assembly versus stability not parsed","Direct mammalian Snail-TBL1X recruitment not shown here"]},{"year":2012,"claim":"Linked Ebi to AP-1-dependent repression controlling apoptotic gene balance, defining a role in neuronal survival and oxidative stress resistance.","evidence":"Co-IP, loss-of-function genetics, survival and oxidative stress assays in Drosophila photoreceptors","pmids":["22666340"],"confidence":"Medium","gaps":["Direct target apoptotic genes not fully resolved","Mammalian AP-1-TBL1X relevance untested"]},{"year":2013,"claim":"Placed Ebi in cell-cycle control via an RBF/E2F corepressor function antagonistic to Polycomb silencing at the G1/S transition.","evidence":"Co-IP with RBF, genetic epistasis with Polycomb, and gene expression analysis in Drosophila","pmids":["23919509"],"confidence":"Medium","gaps":["Mechanism of antagonism with Polycomb not biochemically defined","Direct target gene set incomplete"]},{"year":2016,"claim":"Provided the disease anchor: WD40-domain TBL1X mutations cause central hypothyroidism by impairing the thyroid hormone receptor-corepressor complex where TBL1X is expressed in pituitary and hypothalamus.","evidence":"Sanger sequencing across families, in vitro mutant expression/thermal stability assays, and human tissue immunostaining","pmids":["27603907"],"confidence":"Medium","gaps":["Functional assays limited to protein expression/stability","Direct effect on TSH/TH target transcription not measured"]},{"year":2016,"claim":"Refined the degradation function with structural detail, mapping specific WD40 repeats (7-8) of Ebi to a ligand domain of the transmembrane substrate Crumbs in ubiquitin-dependent downregulation.","evidence":"Co-IP with domain mapping, ubiquitylation assay, genetic suppression, and in vivo protein-level imaging in Drosophila wing","pmids":["27702784"],"confidence":"High","gaps":["E3 ligase partner for Crb degradation not defined","Conservation of WD40-7/8 substrate recognition in mammals untested"]},{"year":2018,"claim":"Reinforced the human loss-of-function model with a WD40-truncating mutation causing central hypothyroidism, consistent with loss of nuclear protein-protein interactions.","evidence":"Next-generation sequencing and clinical/biochemical phenotyping of a patient","pmids":["30591955"],"confidence":"Low","gaps":["No direct in vitro mechanistic assay for this specific mutation","Causality inferred from genotype-phenotype correlation"]},{"year":2018,"claim":"Identified post-transcriptional control of TBL1X by miR-138-5p in trophoblasts, linking TBL1X dosage to cell migration and proliferation.","evidence":"3'-UTR luciferase assay plus migration and proliferation assays in HTR-8/SVneo cells","pmids":["30463081"],"confidence":"Medium","gaps":["Downstream TBL1X effector genes in trophoblasts not defined","In vivo placental relevance not established"]},{"year":2022,"claim":"Established TBL1X as a druggable degradation hub in lymphoma, where it forms an SCF/TBL1X supercomplex that promotes beta-catenin-independent proteasomal degradation of oncoproteins.","evidence":"siRNA/shRNA knockdown, tegavivint (N-terminus-targeting), degradation assays, and Co-IP in DLBCL","pmids":["36206873"],"confidence":"Medium","gaps":["Specific oncoprotein substrates only partly enumerated","Review-format summary of same-group findings"]},{"year":2022,"claim":"Showed TBL1X can act as a transcriptional trans-activator with TCF4 in a feed-forward circuit promoting carcinoma migration and invasion.","evidence":"Co-IP, Flot2 promoter luciferase, ChIP, knockdown/overexpression migration assays, and in vivo metastasis in NPC","pmids":["35173544"],"confidence":"Medium","gaps":["Mechanism of corepressor-to-activator switch unresolved","Direct TBL1X DNA association not shown"]},{"year":2023,"claim":"Defined an RNA-guided degradation function: lncRNA MIAT recruits TBL1X to ubiquitinate and downregulate TP53, promoting immune evasion in prostate cancer.","evidence":"RNA pulldown/Co-IP, ubiquitination assay, and in vitro/in vivo knockdown-overexpression rescue","pmids":["37356458"],"confidence":"Medium","gaps":["E3 ligase mediating TP53 ubiquitination not specified","Direct TBL1X-TP53 contact versus complex-mediated not resolved"]},{"year":2024,"claim":"Revealed isoform-specific function: an exon-6-skipping variant TBL1X-S binds ZEB1 more strongly to drive EMT, showing splicing tunes TBL1X partner selectivity.","evidence":"RNA-seq, mRNA half-life assays, Co-IP for differential ZEB1 binding, CDH1 reporter, and metastasis phenotyping in HCC","pmids":["39462759"],"confidence":"Medium","gaps":["Structural basis of enhanced ZEB1 binding by TBL1X-S unknown","Relative abundance of isoforms in normal tissue unclear"]},{"year":2024,"claim":"Demonstrated TBL1X is targetable by PROTAC degraders, validating proteasome-dependent ternary-complex-driven removal as a therapeutic strategy.","evidence":"PROTAC synthesis, western blot, proteasome competition, ternary complex and cytotoxicity assays in DLBCL","pmids":["39411529"],"confidence":"Medium","gaps":["Selectivity over TBL1XR1 not fully characterized","In vivo efficacy not established"]},{"year":2025,"claim":"Connected TBL1X to genomic stability by showing it maintains cyclin D1 and RAD51 levels, making its inhibition synthetically lethal with PARP inhibition in mantle cell lymphoma.","evidence":"shRNA knockdown, tegavivint, protein stability western blots, γH2AX DNA damage, PDX models, and synergy assays","pmids":["40009753"],"confidence":"Medium","gaps":["Direct mechanism of cyclin D1/RAD51 stabilization not resolved","Whether effect is corepressor- or degradation-mediated unclear"]},{"year":2026,"claim":"Defined physiological roles in metabolism and immunity: TBL1X (with TBL1XR1) acts through PAX6-HDAC3 to sustain insulin transcription and beta-cell identity, and restrains pro-inflammatory CD4+ T cell activity.","evidence":"Beta-cell and CD4-conditional knockouts, scRNA-seq, ChIP, interactome screens, insulin reporter, bone marrow transplant atherosclerosis model in mice with human validation","pmids":["42020373","41539423"],"confidence":"High","gaps":["Functional redundancy versus distinct roles of TBL1X and TBL1XR1 not fully separated","Whether T cell phenotype is corepressor- or degradation-dependent unresolved"]},{"year":null,"claim":"How TBL1X switches between histone-deacetylation corepression, transcriptional activation, and SCF-dependent substrate degradation at specific targets, and what governs partner/substrate selectivity, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model explaining context-dependent corepressor-versus-degradation activity","Determinants of WD40 substrate/partner selection not mapped across mammalian targets","Functional division of labor between TBL1X and TBL1XR1 incompletely defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,10,20]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[10,17,20]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3,9,12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5,18,20]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,10,20]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[5]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,9,11]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,2,20]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[19]}],"complexes":["NCoR/SMRT-HDAC3 corepressor complex","SCF (Skp1/Cul1/F-box)/TBL1X supercomplex","PAX6-HDAC3 complex"],"partners":["HDAC3","SNAIL","TCF4","ZEB1","PAX6","TBL1XR1","SMRTER","SU(H)"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60907","full_name":"F-box-like/WD repeat-containing protein TBL1X","aliases":["SMAP55","Transducin beta-like protein 1X","Transducin-beta-like protein 1, X-linked"],"length_aa":577,"mass_kda":62.5,"function":"F-box-like protein involved in the recruitment of the ubiquitin/19S proteasome complex to nuclear receptor-regulated transcription units (PubMed:14980219). Plays an essential role in transcription activation mediated by nuclear receptors. 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Ebi is physically linked to Siah via SIP (an Sgt1 homolog that binds Skp1), forming an SCF-like complex that targets beta-catenin for degradation downstream of p53-induced Siah expression.\",\n      \"method\": \"Co-immunoprecipitation, protein interaction mapping, beta-catenin degradation assay, epistasis with p53/Siah pathway\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and functional degradation assay in single lab; Ebi is the Drosophila ortholog and direct mammalian TBL1X homolog context established\",\n      \"pmids\": [\"11389839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Drosophila Ebi (ortholog of TBL1X) forms a complex with Su(H) and the corepressor SMRTER; EGFR signaling promotes transcriptional derepression by causing translocation of SMRTER to the cytoplasm in a proteasome-dependent manner, thereby enabling Delta expression in photoreceptor cells.\",\n      \"method\": \"Co-immunoprecipitation, genetic epistasis (EGFR/ebi/sno pathway), proteasome inhibition, subcellular localization imaging\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic epistasis, proteasome dependency, and localization data in one study; replicated mechanistic framework across multiple Drosophila papers\",\n      \"pmids\": [\"12230979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Drosophila Ebi (ortholog of TBL1X) regulates EGFR signaling at multiple steps and promotes EGFR-dependent down-regulation of Tramtrack88 (a repressor of neuronal development). Ebi encodes an evolutionarily conserved protein with an F-box-like domain and six WD40 repeats; proteins with related structures regulate protein degradation.\",\n      \"method\": \"Genetic analysis (loss-of-function mutations, genetic interaction with Egfr), developmental phenotype, protein domain analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis and developmental phenotype in single lab; Tramtrack88 downregulation shown but biochemical mechanism not fully reconstituted in this paper\",\n      \"pmids\": [\"10215623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Drosophila Ebi (ortholog of TBL1X) physically interacts with Sina and phyllopod, and promotes Ttk88 (Tramtrack88) degradation in vitro and in S2 cells. Ebi has two distinct functions: promotion of Ttk88 degradation (enabling neuronal differentiation) and a second independent function limiting S-phase entry in the nervous system.\",\n      \"method\": \"Co-immunoprecipitation (physical interaction with Sina and phyllopod), in vitro degradation assay, S2 cell degradation assay, loss-of-function genetic analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro degradation assay plus Co-IP plus cell-based assay, combined with genetic evidence of two independent functions\",\n      \"pmids\": [\"11032805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The Drosophila Ebi/SMRTER corepressor complex represses transcription of charlatan (chn), an NRSF/REST-like zinc-finger gene, by competing with the Notch intracellular domain (NICD) activation complex at the chn promoter. This double-negative regulation (Ebi/SMRTER represses chn; chn represses Delta) maintains Delta expression and inductive activity in photoreceptor cells under EGF signaling.\",\n      \"method\": \"Genetic epistasis, loss-of-function analysis, transcriptional reporter assays, identification of Ebi/SMRTER complex at chn promoter\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with functional reporter assays in single lab; complex mechanism established through multiple genetic interactions\",\n      \"pmids\": [\"16763555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Drosophila Ebi (ortholog of TBL1X) acts as an essential co-repressor for Snail-mediated transcriptional repression in mesoderm formation. Ebi and Snail interact physically (a conserved Snail domain binds Ebi independently of CtBP). The mammalian Ebi homolog TBL1 is part of the NCoR/SMRT-HDAC3 co-repressor complex, and Ebi interacts with Drosophila HDAC3. Ebi is recruited to Snail target genes in a Snail-dependent manner, correlating with histone hypoacetylation. HDAC3 knockdown or HDAC inhibitor impairs Snail-mediated repression.\",\n      \"method\": \"Co-immunoprecipitation (Ebi-Snail physical interaction), chromatin immunoprecipitation (ChIP), HDAC3 RNAi knockdown, HDAC inhibitor treatment, transgenic embryo rescue, histone acetylation assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP, Co-IP, RNAi, pharmacological inhibition, and transgenic rescue in one study; establishes TBL1 as part of NCoR/SMRT-HDAC3 complex with histone deacetylation as mechanism\",\n      \"pmids\": [\"18309295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Drosophila Ebi (ortholog of TBL1X) forms a complex with activator protein 1 (AP-1) and is required for repression of pro-apoptotic and anti-apoptotic gene expression in photoreceptor neurons. Loss of ebi causes late-onset neuronal apoptosis and increased sensitivity to oxidative stress.\",\n      \"method\": \"Co-immunoprecipitation (Ebi-AP-1 complex), loss-of-function genetic analysis, survival assay, oxidative stress assay, gene expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and loss-of-function with defined phenotypic readout in single lab\",\n      \"pmids\": [\"22666340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Drosophila Ebi (ortholog of TBL1X) forms a complex with retinoblastoma family protein (RBF) and regulates expression of specific Rbf/E2F pathway target genes, acting as a corepressor to mitigate excess growth signaling. Ebi also sustains expression of Rbf itself. Genetic analysis shows antagonism between Ebi and the Polycomb group silencing complex in regulating the G1/S phase transition.\",\n      \"method\": \"Co-immunoprecipitation (Ebi-RBF complex), genetic epistasis (Polycomb group), gene expression analysis, loss-of-function alleles\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and genetic epistasis in single lab; multiple pathway interactions assessed\",\n      \"pmids\": [\"23919509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TBL1X mutations (in the conserved WD40-repeat domain) are associated with central hypothyroidism. In vitro studies showed mutations influence TBL1X protein expression and thermal stability. TBL1X mRNA and protein are expressed in human hypothalamus and pituitary, consistent with its role in the thyroid hormone receptor-corepressor complex (NCoR/SMRT) regulating TSH and thyroid hormone signaling.\",\n      \"method\": \"Sanger sequencing, in vitro functional assay (expression and thermal stability of mutant proteins), immunostaining of human hypothalamus and pituitary, mRNA expression analysis\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro functional assays plus human tissue expression; multiple mutations across multiple families but functional assays limited to expression/stability\",\n      \"pmids\": [\"27603907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Drosophila Ebi (TBL1X ortholog) regulates wing growth by ubiquitin-dependent downregulation of the transmembrane protein Crumbs (Crb). Ebi physically binds the extracellular domain of Crb, with the interaction mediated specifically by WD40 repeats 7-8 of Ebi and a laminin G domain of Crb. Ebi knockdown elevates Crb protein levels at the dorsoventral boundary.\",\n      \"method\": \"Co-immunoprecipitation (Ebi-Crb physical interaction, domain mapping), genetic suppression assays, immunofluorescence (Crb protein levels), ubiquitylation assay\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct Co-IP with domain mapping, ubiquitylation assay, genetic suppression, and in vivo protein level changes in one study\",\n      \"pmids\": [\"27702784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TBL1X (and its homolog TBLR1) acts as a corepressor/coactivator exchanger for nuclear receptors and transcription factors. GAL4-DBD fusion protein experiments showed TBL1X represses promoter activity in luciferase assays, whereas the Y-linked homolog TBL1Y did not repress promoter activity.\",\n      \"method\": \"GAL4-DBD fusion protein expression, dual luciferase reporter assay, RT-PCR expression analysis\",\n      \"journal\": \"Journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — luciferase reporter assay demonstrates repressor activity of TBL1X; single lab, single method for functional claim\",\n      \"pmids\": [\"15834507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TBL1X is required for regulation of major transcriptional programs through the SMRT/NCoR/BCL6 complex, Wnt/β-catenin, and NF-κB signaling. In DLBCL, genetic knockdown of TBL1X and treatment with tegavivint (targeting the TBL1X N-terminus) results in decreased expression of critical oncoproteins in a posttranscriptional/β-catenin-independent manner by promoting proteasomal degradation through a Skp1/Cul1/F-box (SCF)/TBL1X supercomplex.\",\n      \"method\": \"Genetic knockdown (siRNA/shRNA), small molecule treatment (tegavivint), proteasomal degradation assay, co-immunoprecipitation (SCF/TBL1X supercomplex)\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional KD plus Co-IP for complex identification in single lab; review article summarizing original experimental findings from the same group\",\n      \"pmids\": [\"36206873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TBL1X is recruited by lncRNA MIAT to ubiquitinate and downregulate TP53 protein in prostate adenocarcinoma cells, thereby promoting immune evasion. Silencing of TP53 or overexpression of TBL1X abrogated tumor-suppressive effects of MIAT knockdown in vitro and in vivo.\",\n      \"method\": \"RNA pulldown/Co-IP (MIAT-TBL1X interaction), ubiquitination assay, genetic knockdown and overexpression, in vitro and in vivo rescue experiments\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay plus rescue experiments; single lab with multiple methods establishing TBL1X as TP53 ubiquitination mediator\",\n      \"pmids\": [\"37356458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PPM1G promotes production of an exon-6-skipping splice variant of TBL1X (TBL1X-S) in hepatocellular carcinoma by prolonging the half-life of the TBL1X-S transcript. TBL1X-S shows significantly enhanced binding affinity for ZEB1 compared to full-length TBL1X, resulting in ZEB1 activation, CDH1 repression, and acceleration of epithelial-mesenchymal transition (EMT). PPM1G-driven metastasis is partially dependent on TBL1X-S.\",\n      \"method\": \"RNA sequencing, mRNA stability assay (half-life measurement), Co-immunoprecipitation (TBL1X variant-ZEB1 interaction), transcriptional reporter (CDH1 promoter), overexpression/knockdown with metastasis phenotype readout\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for differential binding, mRNA stability assay, and functional rescue; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"39462759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TBL1X controls the stability of the MCL oncogenic drivers cyclin D1 and RAD51 in mantle cell lymphoma cells. Genetic knockdown of TBL1X or treatment with tegavivint (targeting TBL1X N-terminus) results in significant DNA damage, cell cycle arrest, and cell death in vitro and in vivo. Combining tegavivint with the PARP1/2 inhibitor talazoparib results in synergistic MCL cell death, consistent with TBL1X maintaining genomic stability.\",\n      \"method\": \"Genetic knockdown (shRNA), small molecule treatment (tegavivint), western blot (cyclin D1/RAD51 protein stability), DNA damage assay (γH2AX), cell cycle analysis, in vivo patient-derived xenograft model, synergy assay\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined protein stability and DNA damage readouts, in vivo validation; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"40009753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TBL1X degraders (PROTACs) targeting TBL1X can selectively reduce TBL1X protein levels via proteasomal degradation in DLBCL cells. TBL1X degradation by the PROTAC TD11 is dependent on ternary complex formation and the proteasome. O-linked PROTACs achieved significant TBL1X degradation while N-linked PROTACs showed minimal degradation, indicating the linker attachment site is critical for effective degradation.\",\n      \"method\": \"PROTAC synthesis, western blot (TBL1X protein levels), proteasome inhibition (competition assay), ternary complex formation assay, cytotoxicity assay\",\n      \"journal\": \"ACS medicinal chemistry letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct proteasome-dependent degradation shown with mechanistic controls; single lab proof-of-concept study\",\n      \"pmids\": [\"39411529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"miR-138-5p inhibits migration and proliferation of trophoblast cells (HTR-8/SVneo) by directly targeting the 3'-UTR of TBL1X, as confirmed by luciferase assay. TBL1X expression was inversely correlated with miR-138-5p in GDM placentas.\",\n      \"method\": \"Luciferase reporter assay (3'-UTR targeting), wound healing assay, transwell migration assay, CCK8 proliferation assay\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR luciferase validation plus functional cellular assays; single lab with two orthogonal methods\",\n      \"pmids\": [\"30463081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TBL1X interacts with TCF4 to trans-activate Flotillin-2 (Flot2) expression in nasopharyngeal carcinoma. TBL1X promotes NPC cell migration and invasion through Flot2 both in vitro and in vivo. Flot2 reciprocally increases TBL1X expression by upregulating c-Myc, which was identified as a positive regulatory transcription factor of TBL1X.\",\n      \"method\": \"Co-immunoprecipitation (TBL1X-TCF4 interaction), luciferase reporter (Flot2 promoter), knockdown/overexpression with migration/invasion assays, in vivo metastasis model, ChIP (c-Myc on TBL1X promoter)\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, reporter assay, ChIP, and functional rescue in single lab; multiple orthogonal methods\",\n      \"pmids\": [\"35173544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TBL1X is part of the NCoR-SMRT corepressor complex involved in repression of thyroid hormone action in the pituitary and hypothalamus. A hemizygous truncating TBL1X mutation [p.Arg339Ter] largely truncating the WD-40 repeat domain causes central hypothyroidism, consistent with loss of nuclear protein-protein interactions mediated by the WD-40 domain.\",\n      \"method\": \"Next-generation sequencing, clinical biochemistry (FT4/TSH), TRH test, audiometry, brain MRI; loss-of-function mutation characterization\",\n      \"journal\": \"Journal of the Endocrine Society\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — human genetic loss-of-function with defined phenotype but no direct in vitro mechanistic assay for this specific mutation beyond clinical characterization\",\n      \"pmids\": [\"30591955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Genetic double deletion of TBL1X/TBL1XR1 in CD4+ T cells leads to a shift from naive to effector and Foxp3+ Treg cells, enhanced cytokine production upon stimulation, and induction of pro-inflammatory transcriptional pathways. Transplantation of TBL1X/TBL1XR1-deficient CD4+ T cell bone marrow doubled atherosclerotic plaque development in LDLR KO recipients compared to wild-type, establishing TBL1X as a co-factor restraining CD4+ T cell pro-inflammatory activity.\",\n      \"method\": \"Conditional knockout (CD4-Cre), bone marrow transplantation, flow cytometry (T cell phenotyping), cytokine stimulation assay (ionomycin/PMA), single-cell RNA sequencing, scRNA-seq of human carotid plaques\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined cellular phenotype and in vivo atherosclerosis model; single study with multiple orthogonal methods\",\n      \"pmids\": [\"41539423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TBL1X and TBL1XR1 directly regulate insulin promoter activity through a PAX6-HDAC3 gene regulatory network in pancreatic beta cells. Beta-cell-specific TBL1/R1 knockout in mice leads to progressive hypoinsulinemia, hyperglycemia, loss of beta-cell identity (scRNA-seq shows emergence of polyhormonal cells), and reduced beta-cell maturity. TBL1/R1 interactome screens and ChIP confirm direct association with the insulin promoter and PAX6-HDAC3 complex.\",\n      \"method\": \"Beta-cell-specific conditional knockout (mouse), scRNA-seq, interactome screen (Co-IP/MS), chromatin immunoprecipitation (ChIP), luciferase reporter (insulin promoter), human beta-cell model validation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — conditional KO phenotype, ChIP, interactome screen, reporter assay, and human model validation; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"42020373\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TBL1X is an adaptor/scaffold subunit of the NCoR/SMRT-HDAC3 transcriptional co-repressor complex that, through its WD40-repeat domain, mediates protein-protein interactions with nuclear receptors (including thyroid hormone receptor), transcription factors (PAX6, Snail, TCF4, AP-1, Su(H)/SMRTER), and ubiquitin-ligase machinery (SCF complexes); it regulates gene expression by facilitating histone deacetylation at target promoters, acts as a corepressor/coactivator exchange factor, and can also promote ubiquitin-proteasome-dependent degradation of specific substrates (beta-catenin, Tramtrack88, TP53, cyclin D1, RAD51), with loss-of-function causing central hypothyroidism and sensorineural deafness due to impaired thyroid hormone signaling in the pituitary and hypothalamus.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TBL1X is a WD40-repeat scaffold/adaptor subunit of the NCoR/SMRT-HDAC3 transcriptional co-repressor complex that controls developmental and metabolic gene programs by coupling sequence-specific transcription factors to histone deacetylation and to the ubiquitin-proteasome system [#5, #20]. In its corepressor role it is recruited to target promoters by transcription factors such as Snail, where it bridges to HDAC3 and drives histone hypoacetylation [#5], and it functions as a corepressor/coactivator exchange factor for nuclear receptors and transcription factors [#10]. Studies of the Drosophila ortholog Ebi established a parallel function as a substrate-recognition component of SCF-like (Skp1/Cul1/F-box) ubiquitin-ligase complexes that target proteins for degradation, including beta-catenin and the neuronal repressor Tramtrack88 (Ttk88) via Sina/phyllopod, thereby controlling EGFR-dependent photoreceptor differentiation and cell-cycle entry [#0, #3, #2]. Through these dual scaffolding activities TBL1X integrates Notch, EGFR, and AP-1 signaling to maintain correct patterns of gene expression and neuronal survival [#1, #4, #6]. In mammalian disease contexts the same SCF/TBL1X supercomplex promotes proteasomal degradation of oncoproteins, and TBL1X controls the stability of cyclin D1, RAD51, and TP53 and the transcriptional output of TCF4 and ZEB1 in several cancers [#11, #14, #17, #13]. Genetically, TBL1X serves as a co-factor for the PAX6-HDAC3 network governing insulin promoter activity and beta-cell identity [#20] and restrains pro-inflammatory CD4+ T cell activity [#19]. Loss-of-function mutations truncating or destabilizing the WD40-repeat domain cause central hypothyroidism through impaired thyroid hormone receptor-corepressor signaling in the pituitary and hypothalamus [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that the TBL1X ortholog Ebi is a conserved WD40/F-box-like protein acting in EGFR signaling to downregulate a transcriptional repressor, framing TBL1X-family proteins as candidate degradation adaptors.\",\n      \"evidence\": \"Loss-of-function genetics and Egfr genetic interaction in Drosophila, with domain analysis showing six WD40 repeats and an F-box-like motif\",\n      \"pmids\": [\"10215623\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biochemical mechanism of Ttk88 downregulation not reconstituted\", \"Direct physical partners not identified in this study\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined Ebi as a substrate-recognition adaptor that promotes ubiquitin-dependent degradation, resolving how it links signaling to protein turnover and neuronal differentiation.\",\n      \"evidence\": \"Co-IP with Sina and phyllopod, in vitro and S2-cell Ttk88 degradation assays, and loss-of-function genetics in Drosophila\",\n      \"pmids\": [\"11032805\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of the separate S-phase-limiting function unresolved\", \"E3 composition not fully defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Extended the degradation-adaptor role to the mammalian context by showing the Ebi/TBL1X homolog targets beta-catenin via an SCF-like Siah/SIP/Skp1 complex downstream of p53.\",\n      \"evidence\": \"Co-IP, interaction mapping, and beta-catenin degradation assays with p53/Siah epistasis\",\n      \"pmids\": [\"11389839\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct demonstration with human TBL1X protein limited\", \"Phosphorylation-independence of beta-catenin recognition not structurally explained\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Connected Ebi to corepressor biology by showing it complexes with Su(H) and SMRTER and that EGFR signaling drives proteasome-dependent SMRTER relocalization to derepress targets.\",\n      \"evidence\": \"Co-IP, genetic epistasis, proteasome inhibition, and subcellular localization in Drosophila photoreceptors\",\n      \"pmids\": [\"12230979\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian equivalence of the Su(H)/SMRTER step not tested\", \"Whether TBL1X mediates SMRTER turnover directly unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed the Ebi/SMRTER corepressor complex competes with Notch activation at a specific promoter, establishing TBL1X-family proteins in promoter-level repression logic during patterning.\",\n      \"evidence\": \"Genetic epistasis, loss-of-function analysis, and reporter assays identifying the complex at the chn promoter\",\n      \"pmids\": [\"16763555\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DNA/factor contacts of TBL1X not mapped\", \"Mammalian conservation of this regulatory circuit untested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated that human TBL1X is a transcriptional repressor and corepressor/coactivator exchange factor, distinguishing it functionally from the non-repressing TBL1Y homolog.\",\n      \"evidence\": \"GAL4-DBD fusion luciferase reporter assays and RT-PCR expression analysis\",\n      \"pmids\": [\"15834507\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single reporter-based assay for the functional claim\", \"Endogenous target genes not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established the canonical mechanism: TBL1X/Ebi is recruited by a sequence-specific repressor (Snail) and acts through the NCoR/SMRT-HDAC3 complex to drive histone deacetylation at target genes.\",\n      \"evidence\": \"Co-IP, ChIP, HDAC3 RNAi, HDAC inhibitor treatment, and transgenic embryo rescue in Drosophila\",\n      \"pmids\": [\"18309295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TBL1X is required for complex assembly versus stability not parsed\", \"Direct mammalian Snail-TBL1X recruitment not shown here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked Ebi to AP-1-dependent repression controlling apoptotic gene balance, defining a role in neuronal survival and oxidative stress resistance.\",\n      \"evidence\": \"Co-IP, loss-of-function genetics, survival and oxidative stress assays in Drosophila photoreceptors\",\n      \"pmids\": [\"22666340\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct target apoptotic genes not fully resolved\", \"Mammalian AP-1-TBL1X relevance untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed Ebi in cell-cycle control via an RBF/E2F corepressor function antagonistic to Polycomb silencing at the G1/S transition.\",\n      \"evidence\": \"Co-IP with RBF, genetic epistasis with Polycomb, and gene expression analysis in Drosophila\",\n      \"pmids\": [\"23919509\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of antagonism with Polycomb not biochemically defined\", \"Direct target gene set incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided the disease anchor: WD40-domain TBL1X mutations cause central hypothyroidism by impairing the thyroid hormone receptor-corepressor complex where TBL1X is expressed in pituitary and hypothalamus.\",\n      \"evidence\": \"Sanger sequencing across families, in vitro mutant expression/thermal stability assays, and human tissue immunostaining\",\n      \"pmids\": [\"27603907\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional assays limited to protein expression/stability\", \"Direct effect on TSH/TH target transcription not measured\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Refined the degradation function with structural detail, mapping specific WD40 repeats (7-8) of Ebi to a ligand domain of the transmembrane substrate Crumbs in ubiquitin-dependent downregulation.\",\n      \"evidence\": \"Co-IP with domain mapping, ubiquitylation assay, genetic suppression, and in vivo protein-level imaging in Drosophila wing\",\n      \"pmids\": [\"27702784\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase partner for Crb degradation not defined\", \"Conservation of WD40-7/8 substrate recognition in mammals untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reinforced the human loss-of-function model with a WD40-truncating mutation causing central hypothyroidism, consistent with loss of nuclear protein-protein interactions.\",\n      \"evidence\": \"Next-generation sequencing and clinical/biochemical phenotyping of a patient\",\n      \"pmids\": [\"30591955\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct in vitro mechanistic assay for this specific mutation\", \"Causality inferred from genotype-phenotype correlation\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified post-transcriptional control of TBL1X by miR-138-5p in trophoblasts, linking TBL1X dosage to cell migration and proliferation.\",\n      \"evidence\": \"3'-UTR luciferase assay plus migration and proliferation assays in HTR-8/SVneo cells\",\n      \"pmids\": [\"30463081\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream TBL1X effector genes in trophoblasts not defined\", \"In vivo placental relevance not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established TBL1X as a druggable degradation hub in lymphoma, where it forms an SCF/TBL1X supercomplex that promotes beta-catenin-independent proteasomal degradation of oncoproteins.\",\n      \"evidence\": \"siRNA/shRNA knockdown, tegavivint (N-terminus-targeting), degradation assays, and Co-IP in DLBCL\",\n      \"pmids\": [\"36206873\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific oncoprotein substrates only partly enumerated\", \"Review-format summary of same-group findings\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed TBL1X can act as a transcriptional trans-activator with TCF4 in a feed-forward circuit promoting carcinoma migration and invasion.\",\n      \"evidence\": \"Co-IP, Flot2 promoter luciferase, ChIP, knockdown/overexpression migration assays, and in vivo metastasis in NPC\",\n      \"pmids\": [\"35173544\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of corepressor-to-activator switch unresolved\", \"Direct TBL1X DNA association not shown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined an RNA-guided degradation function: lncRNA MIAT recruits TBL1X to ubiquitinate and downregulate TP53, promoting immune evasion in prostate cancer.\",\n      \"evidence\": \"RNA pulldown/Co-IP, ubiquitination assay, and in vitro/in vivo knockdown-overexpression rescue\",\n      \"pmids\": [\"37356458\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase mediating TP53 ubiquitination not specified\", \"Direct TBL1X-TP53 contact versus complex-mediated not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed isoform-specific function: an exon-6-skipping variant TBL1X-S binds ZEB1 more strongly to drive EMT, showing splicing tunes TBL1X partner selectivity.\",\n      \"evidence\": \"RNA-seq, mRNA half-life assays, Co-IP for differential ZEB1 binding, CDH1 reporter, and metastasis phenotyping in HCC\",\n      \"pmids\": [\"39462759\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of enhanced ZEB1 binding by TBL1X-S unknown\", \"Relative abundance of isoforms in normal tissue unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated TBL1X is targetable by PROTAC degraders, validating proteasome-dependent ternary-complex-driven removal as a therapeutic strategy.\",\n      \"evidence\": \"PROTAC synthesis, western blot, proteasome competition, ternary complex and cytotoxicity assays in DLBCL\",\n      \"pmids\": [\"39411529\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Selectivity over TBL1XR1 not fully characterized\", \"In vivo efficacy not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected TBL1X to genomic stability by showing it maintains cyclin D1 and RAD51 levels, making its inhibition synthetically lethal with PARP inhibition in mantle cell lymphoma.\",\n      \"evidence\": \"shRNA knockdown, tegavivint, protein stability western blots, γH2AX DNA damage, PDX models, and synergy assays\",\n      \"pmids\": [\"40009753\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism of cyclin D1/RAD51 stabilization not resolved\", \"Whether effect is corepressor- or degradation-mediated unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined physiological roles in metabolism and immunity: TBL1X (with TBL1XR1) acts through PAX6-HDAC3 to sustain insulin transcription and beta-cell identity, and restrains pro-inflammatory CD4+ T cell activity.\",\n      \"evidence\": \"Beta-cell and CD4-conditional knockouts, scRNA-seq, ChIP, interactome screens, insulin reporter, bone marrow transplant atherosclerosis model in mice with human validation\",\n      \"pmids\": [\"42020373\", \"41539423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional redundancy versus distinct roles of TBL1X and TBL1XR1 not fully separated\", \"Whether T cell phenotype is corepressor- or degradation-dependent unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TBL1X switches between histone-deacetylation corepression, transcriptional activation, and SCF-dependent substrate degradation at specific targets, and what governs partner/substrate selectivity, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model explaining context-dependent corepressor-versus-degradation activity\", \"Determinants of WD40 substrate/partner selection not mapped across mammalian targets\", \"Functional division of labor between TBL1X and TBL1XR1 incompletely defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 10, 20]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [10, 17, 20]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 9, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 18, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 10, 20]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 9, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 2, 20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"complexes\": [\n      \"NCoR/SMRT-HDAC3 corepressor complex\",\n      \"SCF (Skp1/Cul1/F-box)/TBL1X supercomplex\",\n      \"PAX6-HDAC3 complex\"\n    ],\n    \"partners\": [\n      \"HDAC3\",\n      \"Snail\",\n      \"TCF4\",\n      \"ZEB1\",\n      \"PAX6\",\n      \"TBL1XR1\",\n      \"SMRTER\",\n      \"Su(H)\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}