{"gene":"TCF20","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2000,"finding":"SPBP (TCF20) is a nuclear multidomain protein containing an N-terminal transactivating region, a novel DNA-binding domain with an AT-hook motif, a bipartite nuclear localization signal, and a C-terminal zinc finger domain of the trithorax family. It functions as a transcriptional coactivator, enhancing the transcriptional activity of c-Jun, Ets1, Sp1, and Pax6 in cotransfection experiments.","method":"Functional domain mapping by deletion analysis, cotransfection reporter assays, PCR analyses of multitissue cDNA panels, cDNA cloning and sequencing","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (domain mapping, reporter assays, nuclear localization confirmed) in a single focused study","pmids":["10995766"],"is_preprint":false},{"year":2000,"finding":"SPBP (TCF20) physically interacts with the RING finger protein RNF4; both are ubiquitously expressed nuclear proteins. RNF4 facilitates accumulation of specific SPBP-DNA complexes in vitro and acts as a positive cofactor in SPBP-mediated transactivation. SPBP's internal PHD/LAP-type zinc finger domain can form intra-chain protein-protein contacts that negatively modulate the SPBP-RNF4 interaction.","method":"In vitro binding assays (EMSA), cotransfection transactivation assays, domain mapping of the PHD/LAP zinc finger interaction","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding and functional cotransfection assays in a single focused study with multiple methods","pmids":["10849425"],"is_preprint":false},{"year":2005,"finding":"SPBP (TCF20) is recruited exclusively to the phosphorylated form of estrogen receptor alpha (ERα) AF1 domain. In a purified system, SPBP bound only in vitro-phosphorylated ERα AF1 or the phosphoserine mimic S118E, with the interaction domain mapped to a 42-amino-acid fragment of SPBP. In cells, SPBP preferentially interacted with liganded and phosphorylated ERα and functioned as a repressor of activated ERα, inhibiting proliferation of ERα-dependent breast cancer cell lines.","method":"Phage display screen for phosphoserine-specific binders, in vitro binding assay with purified proteins and phosphoserine mimic, co-immunoprecipitation in cells, cell proliferation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified in vitro reconstitution with phosphoserine mimic mutagenesis, confirmed in cells by co-IP, functional proliferation readout; multiple orthogonal methods in single rigorous study","pmids":["15831449"],"is_preprint":false},{"year":2007,"finding":"SPBP (TCF20) physically interacts with TopBP1 via the ePHD domain of SPBP and the BRCT6 domain of TopBP1. Together they cooperate as co-activators of Ets1 on c-myc P1P2 and MMP3 promoters with more-than-additive effect. Both proteins associate with these promoters. Depletion of SPBP by siRNA reduced MMP3 secretion by 50% in phorbol ester-stimulated human fibroblasts.","method":"Yeast two-hybrid screen, in vitro binding confirmation, co-immunoprecipitation in vivo, chromatin immunoprecipitation (ChIP), reporter assays, siRNA knockdown","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal in vitro and in vivo interaction confirmed, domain mapping, ChIP, functional siRNA knockdown with specific phenotypic readout; multiple orthogonal methods","pmids":["17913746"],"is_preprint":false},{"year":2011,"finding":"SPBP (TCF20) acts as a transcriptional coactivator of the androgen receptor (AR), enhancing AR activity on the probasin promoter. Pax6 represses AR-mediated transactivation by competing with SPBP for binding to AR, reducing SPBP recruitment to the probasin promoter. The interaction between AR and SPBP, and between AR and Pax6, was mapped to the DNA-binding domains of the respective proteins.","method":"Cotransfection reporter assays, chromatin immunoprecipitation (ChIP), co-immunoprecipitation and domain-mapping binding studies","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and co-IP with domain mapping plus functional reporter assays; single lab, multiple orthogonal methods","pmids":["21935435"],"is_preprint":false},{"year":2012,"finding":"SPBP (TCF20) contains two independent nucleosome-binding domains: a novel core nucleosome-interaction domain at residues 1551–1666 (adjacent to the AT-hook motif) and the C-terminal ePHD/ADD domain that associates with nucleosomes in a histone tail-dependent manner. The 1551–1666 region is critically important for proper nuclear localization of SPBP. Both SPBP and its homologue RAI1 are strongly enriched on chromatin in interphase HeLa cells and display low nuclear mobility.","method":"In vitro nucleosome-binding assays with domain deletion constructs, fluorescence recovery after photobleaching (FRAP), nuclear fractionation, immunofluorescence","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro nucleosome-binding with domain mapping, FRAP for chromatin mobility, fractionation; multiple orthogonal methods in single rigorous study","pmids":["22081970"],"is_preprint":false},{"year":2013,"finding":"The ePHD/ADD-like domain and novel nucleosome-binding domain of SPBP (TCF20) are highly conserved in vertebrate evolution. In vitro and yeast-cell interaction studies showed the C-terminal region adopts a cross-braced topology of zinc finger interactions similar to other structurally determined ePHD/ADD domains. Experimental data confirmed that the conserved novel nucleosome-binding region of RAI1 (homologue) can bind nucleosome core and histones.","method":"Phylogenetic analysis, in vitro interaction studies, yeast cell interaction assays, evolutionary conservation analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and yeast-cell interaction studies with phylogenetic validation; single lab, two methods","pmids":["24205348"],"is_preprint":false},{"year":2014,"finding":"SPBP (TCF20) functions as a transcriptional coactivator of NRF2. Sulforaphane induces SPBP expression, and SPBP stimulates p62/SQSTM1 expression via ARE elements in its promoter. siRNA-mediated knockdown of SPBP significantly decreases p62/SQSTM1 expression and p62 body formation in HeLa cells, and reduces sulforaphane-induced NRF2 and LC3B expression. Overexpressed SPBP and NRF2 act synergistically on the p62/SQSTM1 promoter and colocalize in nuclear speckles.","method":"Reporter gene assays (ARE-driven promoters), siRNA knockdown with immunofluorescence and Western blot, cotransfection synergy assay, colocalization by fluorescence microscopy","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with specific phenotypic readouts, reporter assays, colocalization; single lab, multiple orthogonal methods","pmids":["24416372"],"is_preprint":false},{"year":2014,"finding":"TCF20 is a transcriptional coregulator structurally and functionally related to RAI1; de novo and rare inherited loss-of-function mutations in TCF20 are associated with autism spectrum disorder. A de novo missense and frameshift mutations in TCF20 were identified, supporting TCF20 as an ASD-associated gene.","method":"Cytogenetic characterization (FISH, Southern blotting, inverse PCR), Sanger sequencing of TCF20 open reading frames, exome sequencing","journal":"Journal of medical genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genetic/genomic identification of mutations with no direct functional mechanistic experiments on the protein in this paper","pmids":["25228304"],"is_preprint":false},{"year":2020,"finding":"TCF20 is essential for cortical neurogenesis in mice. TCF20 deletion reduces neuron number and causes abnormal brain function. ChIP-qPCR and transcriptome analysis identified TDG (DNA demethylation factor) as a downstream target gene of TCF20. TDG controls DNA methylation at the TCF-4 promoter, affecting TCF-4 expression and neural differentiation. Overexpression of TDG or TCF-4 rescues neurogenesis deficits caused by TCF20 knockdown.","method":"Conditional knockout mouse model, RNA-seq transcriptome analysis, ChIP-qPCR, rescue experiments by overexpression, immunofluorescence","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with defined cellular phenotype, ChIP-qPCR for pathway placement, epistasis rescue experiment; multiple orthogonal methods in single rigorous study","pmids":["32510763"],"is_preprint":false},{"year":2022,"finding":"TCF20 forms a complex with MeCP2 at the chromatin interface. RTT-causing mutations in MECP2 disrupt the MeCP2-TCF20 interaction. TCF20 and MeCP2 are highly coexpressed in neurons and coregulate key neuronal gene expression. Reducing Tcf20 partially rescued behavioral deficits caused by MECP2 overexpression in mice (MECP2 duplication syndrome model). A PHF14 missense mutation in a patient abolishes the MeCP2-PHF14-TCF20 interaction.","method":"Proximity-dependent biotinylation (BioID) proteomics, co-immunoprecipitation, genetic epistasis in mouse behavioral model (Tcf20 reduction in MECP2 overexpression mice), patient mutation functional validation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — BioID proteomics plus co-IP plus in vivo genetic epistasis rescue plus patient mutation validation; multiple orthogonal methods across multiple systems","pmids":["35074918"],"is_preprint":false},{"year":2023,"finding":"Tcf20 knockout in mice results in impaired neural development and neonatal death. Heterozygous Tcf20 mice show higher CCl4-induced liver fibrosis and differential expression of extracellular matrix homeostasis genes, along with autism-like behavioral phenotypes. Tcf20-null embryonic livers and MEF cells show differential expression of mitochondrial oxidative phosphorylation proteins, increased mitochondrial metabolic activity, and altered citric acid cycle metabolites.","method":"Homologous recombination knockout mouse, Seahorse metabolic analysis, gas chromatography-mass spectrometry proteomics, gene expression analysis, behavioral phenotyping","journal":"Liver international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined metabolic and fibrogenic phenotypes, Seahorse functional metabolic assay, proteomics; single lab, multiple methods","pmids":["37312667"],"is_preprint":false},{"year":2025,"finding":"TCF20 plays a central role in dendritic arborization and dendritic spine formation in neurons. TCF20 knockdown in rat cortical cultures causes downregulation of pre- and postsynaptic pathways and reduced levels of GABRA1, BDNF, PSD-95, c-Fos, GluN2B, and GABRA5, with upregulation of GluA2, in both total homogenates and synaptosomal preparations.","method":"siRNA knockdown in rat cortical cultures, RNA sequencing, Western blot of synaptosomal fractions, immunofluorescence for dendritic morphology","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with RNA-seq and synaptosomal biochemistry providing pathway-level mechanistic placement; single lab, multiple methods","pmids":["39801227"],"is_preprint":false},{"year":2025,"finding":"The MeCP2-TCF20 complex directly suppresses HDAC1 expression in periodontal ligament stem cells, thereby activating the Wnt/β-catenin signaling pathway and promoting osteogenic differentiation. M2 macrophage-derived exosomes activate the MeCP2-TCF20 complex in this context.","method":"Immunoprecipitation-mass spectrometry (IP-MS), RNA sequencing, siRNA knockdown and overexpression validation, Western blot, ALP/ARS osteogenic assays","journal":"Stem cell research & therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS for complex identification, RNA-seq, functional siRNA/overexpression with osteogenic readouts; single lab, multiple methods","pmids":["41094547"],"is_preprint":false},{"year":2024,"finding":"The TCF20/PHF14 chromatin complex in the mammalian brain includes MeCP2, RAI1, TCF20, PHF14, and HMG20A, and plays a role in epigenetic and transcriptional regulation. Mutations in genes encoding components of this complex are linked to neurodevelopmental disorders.","method":"Review and synthesis of existing experimental findings from prior BioID, co-IP, and genetic studies (no new primary experiments reported in this review paper)","journal":"Genes","confidence":"Low","confidence_rationale":"Tier 3 / Weak — review paper summarizing prior experimental evidence; no new primary mechanistic experiments","pmids":["39766920"],"is_preprint":false}],"current_model":"TCF20 (SPBP) is a large nuclear chromatin-binding transcriptional coregulator that contains multiple functional domains including an N-terminal transactivation region, an AT-hook DNA-binding domain, a bipartite NLS, and a C-terminal ePHD/ADD zinc finger domain; it binds nucleosomes via two independent domains, interacts with partners including RNF4, TopBP1, MeCP2/PHF14, and the androgen and estrogen receptors to coactivate or repress transcription, and is required for cortical neurogenesis, dendritic arborization, and synaptic protein expression downstream of a TCF20→TDG→TCF-4 pathway, while also participating in NRF2-driven antioxidant gene expression and, in a broader chromatin complex with MeCP2, regulating key neuronal genes whose dysregulation underlies neurodevelopmental disorders including autism and Rett syndrome."},"narrative":{"mechanistic_narrative":"TCF20 (SPBP) is a large nuclear multidomain chromatin-binding transcriptional coregulator that tunes gene expression by docking on nucleosomes and partnering with sequence-specific transcription factors [PMID:10995766, PMID:22081970]. It contains an N-terminal transactivating region, an AT-hook DNA-binding domain, a bipartite NLS, and a C-terminal ePHD/ADD zinc finger, and it engages chromatin through two independent nucleosome-interaction domains—a core region adjacent to the AT-hook (also required for nuclear localization) and the histone-tail-dependent ePHD/ADD domain—conferring low nuclear mobility and strong chromatin enrichment [PMID:10995766, PMID:22081970]. As a coregulator it enhances the activity of c-Jun, Ets1, Sp1, and Pax6 [PMID:10995766], cooperates with TopBP1 on Ets1 target promoters such as c-myc and MMP3 [PMID:17913746], coactivates the androgen receptor at the probasin promoter in competition with Pax6 [PMID:21935435], and drives NRF2-dependent antioxidant transcription including p62/SQSTM1 [PMID:24416372]; conversely it acts as a context-dependent repressor of phosphorylated, liganded estrogen receptor alpha, restraining ERα-dependent breast cancer cell proliferation [PMID:15831449]. Its interactions are modulated by RNF4, which promotes SPBP-DNA complex formation and transactivation [PMID:10849425]. In the nervous system TCF20 is essential for cortical neurogenesis, acting through a TCF20→TDG→TCF-4 axis in which TDG-controlled DNA methylation at the TCF-4 promoter governs neural differentiation [PMID:32510763], and it controls dendritic arborization, spine formation, and pre-/postsynaptic protein expression [PMID:39801227]. TCF20 assembles into a brain chromatin complex with MeCP2 (and PHF14) to coregulate neuronal genes, an interaction disrupted by Rett-causing MECP2 mutations and by patient PHF14 mutations [PMID:35074918]. Loss-of-function TCF20 mutations are associated with autism spectrum disorder [PMID:25228304].","teleology":[{"year":2000,"claim":"Established TCF20/SPBP as a multidomain nuclear transcriptional coactivator, defining its functional architecture and first transcription-factor targets.","evidence":"Domain mapping by deletion analysis and cotransfection reporter assays with c-Jun, Ets1, Sp1, Pax6","pmids":["10995766"],"confidence":"Medium","gaps":["No endogenous target genes identified","Coactivation shown only in overexpression reporter context"]},{"year":2000,"claim":"Identified RNF4 as a physical cofactor that potentiates SPBP-DNA complex formation and transactivation, and showed the internal PHD/LAP zinc finger autoregulates this interaction.","evidence":"In vitro EMSA binding, cotransfection transactivation assays, domain mapping","pmids":["10849425"],"confidence":"Medium","gaps":["Mechanism of RNF4-enhanced DNA binding unresolved","No genome-wide co-occupancy data"]},{"year":2005,"claim":"Showed phosphorylation-dependent recruitment of SPBP to ERα AF1 and a repressive role on activated ERα, establishing context-dependent repressor function and a phospho-specific recognition mode.","evidence":"Phage display for phosphoserine binders, purified in vitro binding with phosphomimic S118E, cellular co-IP, proliferation assay in ERα-dependent breast cancer lines","pmids":["15831449"],"confidence":"High","gaps":["Switch between coactivator and corepressor roles not mechanistically defined","Endogenous ERα target genes not profiled"]},{"year":2007,"claim":"Defined a TopBP1 partnership through reciprocal domain interactions, placing SPBP on endogenous Ets1 promoters with a functional secretion phenotype.","evidence":"Yeast two-hybrid, in vitro binding, co-IP, ChIP on c-myc/MMP3 promoters, siRNA knockdown reducing MMP3 secretion","pmids":["17913746"],"confidence":"High","gaps":["Structural basis of ePHD-BRCT6 contact unknown","Breadth of TopBP1-SPBP coregulated genes not mapped"]},{"year":2011,"claim":"Demonstrated SPBP coactivation of the androgen receptor and competitive antagonism by Pax6, linking coregulator recruitment to DNA-binding-domain contacts.","evidence":"Cotransfection reporters, ChIP on probasin promoter, co-IP and domain mapping","pmids":["21935435"],"confidence":"Medium","gaps":["Physiological relevance in prostate tissue not tested","Competition shown in overexpression context"]},{"year":2012,"claim":"Resolved how SPBP physically engages chromatin, identifying two independent nucleosome-binding domains and linking one to nuclear localization.","evidence":"In vitro nucleosome-binding with deletion constructs, FRAP, nuclear fractionation, immunofluorescence in HeLa","pmids":["22081970"],"confidence":"High","gaps":["Histone modification specificity of ePHD/ADD binding not defined","In vivo genome-wide nucleosome targeting unknown"]},{"year":2013,"claim":"Established evolutionary conservation and cross-braced zinc-finger topology of the SPBP C-terminal region, generalizing nucleosome-binding to the RAI1 homologue.","evidence":"Phylogenetic analysis, in vitro and yeast-cell interaction studies","pmids":["24205348"],"confidence":"Medium","gaps":["No experimentally determined high-resolution structure","Functional consequence of conservation untested in vivo"]},{"year":2014,"claim":"Placed SPBP within the NRF2 antioxidant program as a coactivator driving p62/SQSTM1 and autophagy-linked gene expression.","evidence":"ARE reporter assays, siRNA knockdown with IF/Western, cotransfection synergy, colocalization in nuclear speckles","pmids":["24416372"],"confidence":"Medium","gaps":["Direct SPBP-NRF2 contact not mapped","ARE occupancy by SPBP not shown by ChIP"]},{"year":2014,"claim":"Linked TCF20 loss-of-function mutations to autism spectrum disorder, connecting the coregulator to human neurodevelopmental disease.","evidence":"Cytogenetics, Sanger sequencing of TCF20 ORFs, exome sequencing identifying de novo and inherited variants","pmids":["25228304"],"confidence":"Low","gaps":["Genetic association without protein-level functional assays in this study","Causal mechanism of variants undefined"]},{"year":2020,"claim":"Defined a developmental signaling axis showing TCF20 is required for cortical neurogenesis via TDG-mediated DNA demethylation controlling TCF-4.","evidence":"Conditional knockout mice, RNA-seq, ChIP-qPCR identifying TDG, epistasis rescue by TDG/TCF-4 overexpression","pmids":["32510763"],"confidence":"High","gaps":["Direct TCF20 binding at the TDG locus vs indirect effect not fully separated","Whether TCF20 acts as activator or repressor of TDG unresolved"]},{"year":2022,"claim":"Identified the MeCP2-TCF20 chromatin complex and showed its disruption underlies Rett and MECP2 duplication phenotypes, integrating TCF20 into a neuronal epigenetic regulatory module.","evidence":"BioID proteomics, co-IP, in vivo genetic epistasis (Tcf20 reduction rescuing MECP2 overexpression mice), patient PHF14 mutation validation","pmids":["35074918"],"confidence":"High","gaps":["Stoichiometry and assembly order of the complex unknown","Genome-wide MeCP2-TCF20 co-regulated targets only partially defined"]},{"year":2023,"claim":"Broadened TCF20 phenotypes beyond brain, revealing roles in liver fibrosis, ECM gene regulation, and mitochondrial metabolism in knockout mice.","evidence":"Homologous recombination knockout, Seahorse metabolic assays, GC-MS proteomics, gene expression and behavioral phenotyping","pmids":["37312667"],"confidence":"Medium","gaps":["Direct transcriptional targets driving metabolic phenotype not identified","Tissue-specific mechanisms not separated from systemic effects"]},{"year":2025,"claim":"Demonstrated TCF20 control of dendritic arborization, spine formation, and synaptic protein expression, mechanistically linking it to synaptic gene programs.","evidence":"siRNA knockdown in rat cortical cultures, RNA-seq, synaptosomal Western blots, dendritic morphology imaging","pmids":["39801227"],"confidence":"Medium","gaps":["Direct vs indirect regulation of individual synaptic genes not distinguished","Whether changes reflect transcriptional coregulation by TCF20 at these loci untested"]},{"year":2025,"claim":"Extended MeCP2-TCF20 complex function to osteogenesis, showing it suppresses HDAC1 to activate Wnt/β-catenin signaling in periodontal ligament stem cells.","evidence":"IP-MS, RNA-seq, siRNA/overexpression, Western blot, ALP/ARS osteogenic assays","pmids":["41094547"],"confidence":"Medium","gaps":["Direct complex occupancy at the HDAC1 locus not shown","Generalizability beyond this stem cell context unknown"]},{"year":null,"claim":"How TCF20 switches between coactivation and corepression, and what determines its genome-wide chromatin targeting within the MeCP2/RAI1/PHF14/HMG20A complex, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of TCF20 domains or complex","Genome-wide direct binding map lacking","Determinants of activator-vs-repressor behavior undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,3,4,7]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[5,6]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,10]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,5]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[5,6]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,3,4,7]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[5,10]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,12]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[7]}],"complexes":["MeCP2-TCF20-PHF14 chromatin complex","TCF20/PHF14 brain chromatin complex (MeCP2, RAI1, TCF20, PHF14, HMG20A)"],"partners":["RNF4","TOPBP1","MECP2","PHF14","AR","ESR1","PAX6","ETS1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UGU0","full_name":"Transcription factor 20","aliases":["Nuclear factor SPBP","Protein AR1","Stromelysin-1 PDGF-responsive element-binding protein","SPRE-binding protein"],"length_aa":1960,"mass_kda":211.8,"function":"Transcriptional activator that binds to the regulatory region of MMP3 and thereby controls stromelysin expression. It stimulates the activity of various transcriptional activators such as JUN, SP1, PAX6 and ETS1, suggesting a function as a coactivator","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9UGU0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TCF20","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"H2AFZ","stoichiometry":0.2},{"gene":"HDAC1","stoichiometry":0.2},{"gene":"HDAC2","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGA1","stoichiometry":0.2},{"gene":"MIF","stoichiometry":0.2},{"gene":"NUCKS1","stoichiometry":0.2},{"gene":"RBBP4","stoichiometry":0.2},{"gene":"TOP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TCF20","total_profiled":1310},"omim":[{"mim_id":"618430","title":"DEVELOPMENTAL DELAY WITH VARIABLE INTELLECTUAL IMPAIRMENT AND BEHAVIORAL ABNORMALITIES; DDVIBA","url":"https://www.omim.org/entry/618430"},{"mim_id":"607642","title":"RETINOIC ACID-INDUCED GENE 1; RAI1","url":"https://www.omim.org/entry/607642"},{"mim_id":"603107","title":"TRANSCRIPTION FACTOR 20; TCF20","url":"https://www.omim.org/entry/603107"},{"mim_id":"300405","title":"RAS-ASSOCIATED PROTEIN RAB40A-LIKE; RAB40AL","url":"https://www.omim.org/entry/300405"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nuclear bodies","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TCF20"},"hgnc":{"alias_symbol":["AR1","SPBP"],"prev_symbol":[]},"alphafold":{"accession":"Q9UGU0","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UGU0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UGU0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UGU0-F1-predicted_aligned_error_v6.png","plddt_mean":38.91},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TCF20","jax_strain_url":"https://www.jax.org/strain/search?query=TCF20"},"sequence":{"accession":"Q9UGU0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UGU0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UGU0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UGU0"}},"corpus_meta":[{"pmid":"10995766","id":"PMC_10995766","title":"The nuclear factor SPBP contains different functional domains and stimulates the activity of various transcriptional activators.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10995766","citation_count":49,"is_preprint":false},{"pmid":"10849425","id":"PMC_10849425","title":"Interaction between the transcription factor SPBP and the positive cofactor RNF4. An interplay between protein binding zinc fingers.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10849425","citation_count":44,"is_preprint":false},{"pmid":"9179852","id":"PMC_9179852","title":"HlyX, the FNR homologue of Actinobacillus pleuropneumoniae, is a [4Fe-4S]-containing oxygen-responsive transcription regulator that anaerobically activates FNR-dependent class I promoters via an enhanced AR1 contact.","date":"1997","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/9179852","citation_count":40,"is_preprint":false},{"pmid":"30819258","id":"PMC_30819258","title":"De novo and inherited TCF20 pathogenic variants are associated with intellectual disability, dysmorphic features, hypotonia, and neurological impairments with similarities to Smith-Magenis syndrome.","date":"2019","source":"Genome medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30819258","citation_count":39,"is_preprint":false},{"pmid":"15831449","id":"PMC_15831449","title":"SPBP is a phosphoserine-specific repressor of estrogen receptor alpha.","date":"2005","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15831449","citation_count":39,"is_preprint":false},{"pmid":"35074918","id":"PMC_35074918","title":"Disruption of MeCP2-TCF20 complex underlies distinct neurodevelopmental disorders.","date":"2022","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/35074918","citation_count":37,"is_preprint":false},{"pmid":"25228304","id":"PMC_25228304","title":"De novo and rare inherited mutations implicate the transcriptional coregulator TCF20/SPBP in autism spectrum disorder.","date":"2014","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25228304","citation_count":36,"is_preprint":false},{"pmid":"24416372","id":"PMC_24416372","title":"SPBP is a sulforaphane induced transcriptional coactivator of NRF2 regulating expression of the autophagy receptor p62/SQSTM1.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24416372","citation_count":35,"is_preprint":false},{"pmid":"21507986","id":"PMC_21507986","title":"T4-Like genome organization of the Escherichia coli O157:H7 lytic phage AR1.","date":"2011","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/21507986","citation_count":32,"is_preprint":false},{"pmid":"27436265","id":"PMC_27436265","title":"De novo nonsense and frameshift variants of TCF20 in individuals with intellectual disability and postnatal overgrowth.","date":"2016","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/27436265","citation_count":31,"is_preprint":false},{"pmid":"11029414","id":"PMC_11029414","title":"Characterization of the distal tail fiber locus and determination of the receptor for phage AR1, which specifically infects Escherichia coli O157:H7.","date":"2000","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/11029414","citation_count":31,"is_preprint":false},{"pmid":"32510763","id":"PMC_32510763","title":"TCF20 dysfunction leads to cortical neurogenesis defects and autistic-like behaviors in mice.","date":"2020","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/32510763","citation_count":27,"is_preprint":false},{"pmid":"22081970","id":"PMC_22081970","title":"Identification of two independent nucleosome-binding domains in the transcriptional co-activator SPBP.","date":"2012","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/22081970","citation_count":27,"is_preprint":false},{"pmid":"9767578","id":"PMC_9767578","title":"Downregulation of Escherichia coli yfiD expression by FNR occupying a site at -93.5 involves the AR1-containing face of FNR.","date":"1998","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/9767578","citation_count":25,"is_preprint":false},{"pmid":"17913746","id":"PMC_17913746","title":"The ePHD protein SPBP interacts with TopBP1 and together they co-operate to stimulate Ets1-mediated transcription.","date":"2007","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/17913746","citation_count":24,"is_preprint":false},{"pmid":"10795679","id":"PMC_10795679","title":"Two distinct pathways for anaerobic degradation of aromatic compounds in the denitrifying bacterium Thauera aromatica strain AR-1.","date":"2000","source":"Archives of microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/10795679","citation_count":23,"is_preprint":false},{"pmid":"1708767","id":"PMC_1708767","title":"endAFS, a novel family E endoglucanase gene from Fibrobacter succinogenes AR1.","date":"1991","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/1708767","citation_count":21,"is_preprint":false},{"pmid":"24205348","id":"PMC_24205348","title":"A phylogenetic study of SPBP and RAI1: evolutionary conservation of chromatin binding modules.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24205348","citation_count":20,"is_preprint":false},{"pmid":"9531634","id":"PMC_9531634","title":"Anaerobic degradation of alpha-resorcylate by Thauera aromatica strain AR-1 proceeds via oxidation and decarboxylation to hydroxyhydroquinone.","date":"1998","source":"Archives of microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/9531634","citation_count":19,"is_preprint":false},{"pmid":"12076800","id":"PMC_12076800","title":"Anaerobic degradation of protocatechuate (3,4-dihydroxybenzoate) by Thauera aromatica strain AR-1.","date":"2002","source":"FEMS microbiology letters","url":"https://pubmed.ncbi.nlm.nih.gov/12076800","citation_count":17,"is_preprint":false},{"pmid":"21935435","id":"PMC_21935435","title":"Pax6 represses androgen receptor-mediated transactivation by inhibiting recruitment of the coactivator SPBP.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21935435","citation_count":16,"is_preprint":false},{"pmid":"9621060","id":"PMC_9621060","title":"AR1 is an integral part of the adenovirus type 2 E1A-CR3 transactivation domain.","date":"1998","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/9621060","citation_count":15,"is_preprint":false},{"pmid":"30216695","id":"PMC_30216695","title":"A previously unrecognized 22q13.2 microdeletion syndrome that encompasses TCF20 and TNFRSF13C.","date":"2018","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/30216695","citation_count":14,"is_preprint":false},{"pmid":"22238063","id":"PMC_22238063","title":"Characterization and genetic analysis of an EIN4-like sequence (CaETR-1) located in QTL(AR1) implicated in ascochyta blight resistance in chickpea.","date":"2012","source":"Plant cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/22238063","citation_count":14,"is_preprint":false},{"pmid":"34904221","id":"PMC_34904221","title":"Rare and de novo duplications containing TCF20 are associated with a neurodevelopmental disorder.","date":"2021","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34904221","citation_count":12,"is_preprint":false},{"pmid":"2014986","id":"PMC_2014986","title":"Molecular cloning, expression, and characterization of endoglucanase genes from Fibrobacter succinogenes AR1.","date":"1991","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/2014986","citation_count":12,"is_preprint":false},{"pmid":"26253674","id":"PMC_26253674","title":"Identification of the Gene Cluster for the Anaerobic Degradation of 3,5-Dihydroxybenzoate (α-Resorcylate) in Thauera aromatica Strain AR-1.","date":"2015","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/26253674","citation_count":12,"is_preprint":false},{"pmid":"30389770","id":"PMC_30389770","title":"DbdR, a New Member of the LysR Family of Transcriptional Regulators, Coordinately Controls Four Promoters in the Thauera aromatica AR-1 3,5-Dihydroxybenzoate Anaerobic Degradation Pathway.","date":"2019","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/30389770","citation_count":12,"is_preprint":false},{"pmid":"37312667","id":"PMC_37312667","title":"Tcf20 deficiency is associated with increased liver fibrogenesis and alterations in mitochondrial metabolism in mice and humans.","date":"2023","source":"Liver international : official journal of the International Association for the Study of the Liver","url":"https://pubmed.ncbi.nlm.nih.gov/37312667","citation_count":5,"is_preprint":false},{"pmid":"37303953","id":"PMC_37303953","title":"A syndrome featuring developmental disorder of the nervous system induced by a novel mutation in the TCF20 gene, rarely concurrent immune disorders: a case report.","date":"2023","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/37303953","citation_count":5,"is_preprint":false},{"pmid":"37879370","id":"PMC_37879370","title":"Electrochemical oxidation of azo dyes degradation by RuO2-IrO2-TiO2 electrode with biodegradation Aeromonas hydrophila AR1 and its degradation pathway: An integrated approach.","date":"2023","source":"Chemosphere","url":"https://pubmed.ncbi.nlm.nih.gov/37879370","citation_count":5,"is_preprint":false},{"pmid":"3899466","id":"PMC_3899466","title":"Detection of human pancreatic adenocarcinomas by histochemical staining with monoclonal antibody AR1-28.","date":"1985","source":"Diagnostic immunology","url":"https://pubmed.ncbi.nlm.nih.gov/3899466","citation_count":5,"is_preprint":false},{"pmid":"39766920","id":"PMC_39766920","title":"Epigenetic Regulation and Neurodevelopmental Disorders: From MeCP2 to the TCF20/PHF14 Complex.","date":"2024","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/39766920","citation_count":4,"is_preprint":false},{"pmid":"2433945","id":"PMC_2433945","title":"Reactivity of monoclonal anti-human pancreatic carcinoma antibodies AR2-20 and AR1-28 with tumors of nonpancreatic origin.","date":"1987","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/2433945","citation_count":4,"is_preprint":false},{"pmid":"39801227","id":"PMC_39801227","title":"Regulation of Dendrite and Dendritic Spine Formation by TCF20.","date":"2025","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/39801227","citation_count":3,"is_preprint":false},{"pmid":"2027774","id":"PMC_2027774","title":"The involvement of transcriptional read-through from internal promoters in the expression of a novel endoglucanase gene FSendA, from Fibrobacter succinogenes AR1.","date":"1991","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/2027774","citation_count":3,"is_preprint":false},{"pmid":"41094547","id":"PMC_41094547","title":"M2-exo promote orthodontic bone remodeling via the MeCP2-TCF20-HDAC1 axis.","date":"2025","source":"Stem cell research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/41094547","citation_count":2,"is_preprint":false},{"pmid":"21780145","id":"PMC_21780145","title":"Surveillance of single-cell behavior in different subpopulations of Ralstonia pickettii AR1 during growth and polyhydroxybutyrate production phases by flow cytometry.","date":"2011","source":"Journal of basic microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/21780145","citation_count":2,"is_preprint":false},{"pmid":"12542256","id":"PMC_12542256","title":"Analysis of the baseplate region of phage AR1 that specifically infects Escherichia coli O157:H7.","date":"2002","source":"Journal of microbiology, immunology, and infection = Wei mian yu gan ran za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/12542256","citation_count":2,"is_preprint":false},{"pmid":"39060884","id":"PMC_39060884","title":"Association Between CYP2D7 and TCF20 Polymorphisms and Coronary Heart Disease.","date":"2024","source":"Cardiovascular toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/39060884","citation_count":1,"is_preprint":false},{"pmid":"12872983","id":"PMC_12872983","title":"Human act and AR1 sequences differentially regulate murine and human D1A dopamine receptor promoters.","date":"2003","source":"Molecules and cells","url":"https://pubmed.ncbi.nlm.nih.gov/12872983","citation_count":1,"is_preprint":false},{"pmid":"39598528","id":"PMC_39598528","title":"Chemical Characterization and In Vitro Evaluation of Glucans from Fermentation-Produced Nutraceutical Bionutri-AR1®: Antioxidant and Immunomodulatory Properties.","date":"2024","source":"Pharmaceutics","url":"https://pubmed.ncbi.nlm.nih.gov/39598528","citation_count":1,"is_preprint":false},{"pmid":"40011607","id":"PMC_40011607","title":"Germline mosaicism in TCF20-associated neurodevelopmental disorders: a case study and literature review.","date":"2025","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/40011607","citation_count":0,"is_preprint":false},{"pmid":"41300659","id":"PMC_41300659","title":"A Boy with a Novel Variant in TCF20: An Expanded Phenotype and a Brief Review of the Literature.","date":"2025","source":"Children (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/41300659","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.01.30.25321087","title":"Genetic regulation of the vascular endothelial growth factor receptor 1 during sepsis and association with ARDS susceptibility","date":"2025-01-31","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.30.25321087","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.07.04.663149","title":"The evolution of function in the DNA binding domain of the CRP/FNR family","date":"2025-07-07","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.04.663149","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.23.650300","title":"Estimating fMRI Timescale Maps","date":"2025-04-26","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.23.650300","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.06.30.601446","title":"MeCP2 Interacts with the Super Elongation Complex to Regulate Transcription","date":"2024-07-01","source":"bioRxiv","url":"https://doi.org/10.1101/2024.06.30.601446","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":25894,"output_tokens":4263,"usd":0.070814,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12306,"output_tokens":4579,"usd":0.088002,"stage2_stop_reason":"end_turn"},"total_usd":0.158816,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"SPBP (TCF20) is a nuclear multidomain protein containing an N-terminal transactivating region, a novel DNA-binding domain with an AT-hook motif, a bipartite nuclear localization signal, and a C-terminal zinc finger domain of the trithorax family. It functions as a transcriptional coactivator, enhancing the transcriptional activity of c-Jun, Ets1, Sp1, and Pax6 in cotransfection experiments.\",\n      \"method\": \"Functional domain mapping by deletion analysis, cotransfection reporter assays, PCR analyses of multitissue cDNA panels, cDNA cloning and sequencing\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (domain mapping, reporter assays, nuclear localization confirmed) in a single focused study\",\n      \"pmids\": [\"10995766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SPBP (TCF20) physically interacts with the RING finger protein RNF4; both are ubiquitously expressed nuclear proteins. RNF4 facilitates accumulation of specific SPBP-DNA complexes in vitro and acts as a positive cofactor in SPBP-mediated transactivation. SPBP's internal PHD/LAP-type zinc finger domain can form intra-chain protein-protein contacts that negatively modulate the SPBP-RNF4 interaction.\",\n      \"method\": \"In vitro binding assays (EMSA), cotransfection transactivation assays, domain mapping of the PHD/LAP zinc finger interaction\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding and functional cotransfection assays in a single focused study with multiple methods\",\n      \"pmids\": [\"10849425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SPBP (TCF20) is recruited exclusively to the phosphorylated form of estrogen receptor alpha (ERα) AF1 domain. In a purified system, SPBP bound only in vitro-phosphorylated ERα AF1 or the phosphoserine mimic S118E, with the interaction domain mapped to a 42-amino-acid fragment of SPBP. In cells, SPBP preferentially interacted with liganded and phosphorylated ERα and functioned as a repressor of activated ERα, inhibiting proliferation of ERα-dependent breast cancer cell lines.\",\n      \"method\": \"Phage display screen for phosphoserine-specific binders, in vitro binding assay with purified proteins and phosphoserine mimic, co-immunoprecipitation in cells, cell proliferation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified in vitro reconstitution with phosphoserine mimic mutagenesis, confirmed in cells by co-IP, functional proliferation readout; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"15831449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SPBP (TCF20) physically interacts with TopBP1 via the ePHD domain of SPBP and the BRCT6 domain of TopBP1. Together they cooperate as co-activators of Ets1 on c-myc P1P2 and MMP3 promoters with more-than-additive effect. Both proteins associate with these promoters. Depletion of SPBP by siRNA reduced MMP3 secretion by 50% in phorbol ester-stimulated human fibroblasts.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro binding confirmation, co-immunoprecipitation in vivo, chromatin immunoprecipitation (ChIP), reporter assays, siRNA knockdown\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal in vitro and in vivo interaction confirmed, domain mapping, ChIP, functional siRNA knockdown with specific phenotypic readout; multiple orthogonal methods\",\n      \"pmids\": [\"17913746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SPBP (TCF20) acts as a transcriptional coactivator of the androgen receptor (AR), enhancing AR activity on the probasin promoter. Pax6 represses AR-mediated transactivation by competing with SPBP for binding to AR, reducing SPBP recruitment to the probasin promoter. The interaction between AR and SPBP, and between AR and Pax6, was mapped to the DNA-binding domains of the respective proteins.\",\n      \"method\": \"Cotransfection reporter assays, chromatin immunoprecipitation (ChIP), co-immunoprecipitation and domain-mapping binding studies\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and co-IP with domain mapping plus functional reporter assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21935435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SPBP (TCF20) contains two independent nucleosome-binding domains: a novel core nucleosome-interaction domain at residues 1551–1666 (adjacent to the AT-hook motif) and the C-terminal ePHD/ADD domain that associates with nucleosomes in a histone tail-dependent manner. The 1551–1666 region is critically important for proper nuclear localization of SPBP. Both SPBP and its homologue RAI1 are strongly enriched on chromatin in interphase HeLa cells and display low nuclear mobility.\",\n      \"method\": \"In vitro nucleosome-binding assays with domain deletion constructs, fluorescence recovery after photobleaching (FRAP), nuclear fractionation, immunofluorescence\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro nucleosome-binding with domain mapping, FRAP for chromatin mobility, fractionation; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"22081970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The ePHD/ADD-like domain and novel nucleosome-binding domain of SPBP (TCF20) are highly conserved in vertebrate evolution. In vitro and yeast-cell interaction studies showed the C-terminal region adopts a cross-braced topology of zinc finger interactions similar to other structurally determined ePHD/ADD domains. Experimental data confirmed that the conserved novel nucleosome-binding region of RAI1 (homologue) can bind nucleosome core and histones.\",\n      \"method\": \"Phylogenetic analysis, in vitro interaction studies, yeast cell interaction assays, evolutionary conservation analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and yeast-cell interaction studies with phylogenetic validation; single lab, two methods\",\n      \"pmids\": [\"24205348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SPBP (TCF20) functions as a transcriptional coactivator of NRF2. Sulforaphane induces SPBP expression, and SPBP stimulates p62/SQSTM1 expression via ARE elements in its promoter. siRNA-mediated knockdown of SPBP significantly decreases p62/SQSTM1 expression and p62 body formation in HeLa cells, and reduces sulforaphane-induced NRF2 and LC3B expression. Overexpressed SPBP and NRF2 act synergistically on the p62/SQSTM1 promoter and colocalize in nuclear speckles.\",\n      \"method\": \"Reporter gene assays (ARE-driven promoters), siRNA knockdown with immunofluorescence and Western blot, cotransfection synergy assay, colocalization by fluorescence microscopy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with specific phenotypic readouts, reporter assays, colocalization; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"24416372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TCF20 is a transcriptional coregulator structurally and functionally related to RAI1; de novo and rare inherited loss-of-function mutations in TCF20 are associated with autism spectrum disorder. A de novo missense and frameshift mutations in TCF20 were identified, supporting TCF20 as an ASD-associated gene.\",\n      \"method\": \"Cytogenetic characterization (FISH, Southern blotting, inverse PCR), Sanger sequencing of TCF20 open reading frames, exome sequencing\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genetic/genomic identification of mutations with no direct functional mechanistic experiments on the protein in this paper\",\n      \"pmids\": [\"25228304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TCF20 is essential for cortical neurogenesis in mice. TCF20 deletion reduces neuron number and causes abnormal brain function. ChIP-qPCR and transcriptome analysis identified TDG (DNA demethylation factor) as a downstream target gene of TCF20. TDG controls DNA methylation at the TCF-4 promoter, affecting TCF-4 expression and neural differentiation. Overexpression of TDG or TCF-4 rescues neurogenesis deficits caused by TCF20 knockdown.\",\n      \"method\": \"Conditional knockout mouse model, RNA-seq transcriptome analysis, ChIP-qPCR, rescue experiments by overexpression, immunofluorescence\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with defined cellular phenotype, ChIP-qPCR for pathway placement, epistasis rescue experiment; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"32510763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TCF20 forms a complex with MeCP2 at the chromatin interface. RTT-causing mutations in MECP2 disrupt the MeCP2-TCF20 interaction. TCF20 and MeCP2 are highly coexpressed in neurons and coregulate key neuronal gene expression. Reducing Tcf20 partially rescued behavioral deficits caused by MECP2 overexpression in mice (MECP2 duplication syndrome model). A PHF14 missense mutation in a patient abolishes the MeCP2-PHF14-TCF20 interaction.\",\n      \"method\": \"Proximity-dependent biotinylation (BioID) proteomics, co-immunoprecipitation, genetic epistasis in mouse behavioral model (Tcf20 reduction in MECP2 overexpression mice), patient mutation functional validation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — BioID proteomics plus co-IP plus in vivo genetic epistasis rescue plus patient mutation validation; multiple orthogonal methods across multiple systems\",\n      \"pmids\": [\"35074918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Tcf20 knockout in mice results in impaired neural development and neonatal death. Heterozygous Tcf20 mice show higher CCl4-induced liver fibrosis and differential expression of extracellular matrix homeostasis genes, along with autism-like behavioral phenotypes. Tcf20-null embryonic livers and MEF cells show differential expression of mitochondrial oxidative phosphorylation proteins, increased mitochondrial metabolic activity, and altered citric acid cycle metabolites.\",\n      \"method\": \"Homologous recombination knockout mouse, Seahorse metabolic analysis, gas chromatography-mass spectrometry proteomics, gene expression analysis, behavioral phenotyping\",\n      \"journal\": \"Liver international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined metabolic and fibrogenic phenotypes, Seahorse functional metabolic assay, proteomics; single lab, multiple methods\",\n      \"pmids\": [\"37312667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TCF20 plays a central role in dendritic arborization and dendritic spine formation in neurons. TCF20 knockdown in rat cortical cultures causes downregulation of pre- and postsynaptic pathways and reduced levels of GABRA1, BDNF, PSD-95, c-Fos, GluN2B, and GABRA5, with upregulation of GluA2, in both total homogenates and synaptosomal preparations.\",\n      \"method\": \"siRNA knockdown in rat cortical cultures, RNA sequencing, Western blot of synaptosomal fractions, immunofluorescence for dendritic morphology\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with RNA-seq and synaptosomal biochemistry providing pathway-level mechanistic placement; single lab, multiple methods\",\n      \"pmids\": [\"39801227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The MeCP2-TCF20 complex directly suppresses HDAC1 expression in periodontal ligament stem cells, thereby activating the Wnt/β-catenin signaling pathway and promoting osteogenic differentiation. M2 macrophage-derived exosomes activate the MeCP2-TCF20 complex in this context.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry (IP-MS), RNA sequencing, siRNA knockdown and overexpression validation, Western blot, ALP/ARS osteogenic assays\",\n      \"journal\": \"Stem cell research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS for complex identification, RNA-seq, functional siRNA/overexpression with osteogenic readouts; single lab, multiple methods\",\n      \"pmids\": [\"41094547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The TCF20/PHF14 chromatin complex in the mammalian brain includes MeCP2, RAI1, TCF20, PHF14, and HMG20A, and plays a role in epigenetic and transcriptional regulation. Mutations in genes encoding components of this complex are linked to neurodevelopmental disorders.\",\n      \"method\": \"Review and synthesis of existing experimental findings from prior BioID, co-IP, and genetic studies (no new primary experiments reported in this review paper)\",\n      \"journal\": \"Genes\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — review paper summarizing prior experimental evidence; no new primary mechanistic experiments\",\n      \"pmids\": [\"39766920\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TCF20 (SPBP) is a large nuclear chromatin-binding transcriptional coregulator that contains multiple functional domains including an N-terminal transactivation region, an AT-hook DNA-binding domain, a bipartite NLS, and a C-terminal ePHD/ADD zinc finger domain; it binds nucleosomes via two independent domains, interacts with partners including RNF4, TopBP1, MeCP2/PHF14, and the androgen and estrogen receptors to coactivate or repress transcription, and is required for cortical neurogenesis, dendritic arborization, and synaptic protein expression downstream of a TCF20→TDG→TCF-4 pathway, while also participating in NRF2-driven antioxidant gene expression and, in a broader chromatin complex with MeCP2, regulating key neuronal genes whose dysregulation underlies neurodevelopmental disorders including autism and Rett syndrome.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TCF20 (SPBP) is a large nuclear multidomain chromatin-binding transcriptional coregulator that tunes gene expression by docking on nucleosomes and partnering with sequence-specific transcription factors [#0, #5]. It contains an N-terminal transactivating region, an AT-hook DNA-binding domain, a bipartite NLS, and a C-terminal ePHD/ADD zinc finger, and it engages chromatin through two independent nucleosome-interaction domains—a core region adjacent to the AT-hook (also required for nuclear localization) and the histone-tail-dependent ePHD/ADD domain—conferring low nuclear mobility and strong chromatin enrichment [#0, #5]. As a coregulator it enhances the activity of c-Jun, Ets1, Sp1, and Pax6 [#0], cooperates with TopBP1 on Ets1 target promoters such as c-myc and MMP3 [#3], coactivates the androgen receptor at the probasin promoter in competition with Pax6 [#4], and drives NRF2-dependent antioxidant transcription including p62/SQSTM1 [#7]; conversely it acts as a context-dependent repressor of phosphorylated, liganded estrogen receptor alpha, restraining ERα-dependent breast cancer cell proliferation [#2]. Its interactions are modulated by RNF4, which promotes SPBP-DNA complex formation and transactivation [#1]. In the nervous system TCF20 is essential for cortical neurogenesis, acting through a TCF20→TDG→TCF-4 axis in which TDG-controlled DNA methylation at the TCF-4 promoter governs neural differentiation [#9], and it controls dendritic arborization, spine formation, and pre-/postsynaptic protein expression [#12]. TCF20 assembles into a brain chromatin complex with MeCP2 (and PHF14) to coregulate neuronal genes, an interaction disrupted by Rett-causing MECP2 mutations and by patient PHF14 mutations [#10]. Loss-of-function TCF20 mutations are associated with autism spectrum disorder [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established TCF20/SPBP as a multidomain nuclear transcriptional coactivator, defining its functional architecture and first transcription-factor targets.\",\n      \"evidence\": \"Domain mapping by deletion analysis and cotransfection reporter assays with c-Jun, Ets1, Sp1, Pax6\",\n      \"pmids\": [\"10995766\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No endogenous target genes identified\", \"Coactivation shown only in overexpression reporter context\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified RNF4 as a physical cofactor that potentiates SPBP-DNA complex formation and transactivation, and showed the internal PHD/LAP zinc finger autoregulates this interaction.\",\n      \"evidence\": \"In vitro EMSA binding, cotransfection transactivation assays, domain mapping\",\n      \"pmids\": [\"10849425\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of RNF4-enhanced DNA binding unresolved\", \"No genome-wide co-occupancy data\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed phosphorylation-dependent recruitment of SPBP to ERα AF1 and a repressive role on activated ERα, establishing context-dependent repressor function and a phospho-specific recognition mode.\",\n      \"evidence\": \"Phage display for phosphoserine binders, purified in vitro binding with phosphomimic S118E, cellular co-IP, proliferation assay in ERα-dependent breast cancer lines\",\n      \"pmids\": [\"15831449\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch between coactivator and corepressor roles not mechanistically defined\", \"Endogenous ERα target genes not profiled\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a TopBP1 partnership through reciprocal domain interactions, placing SPBP on endogenous Ets1 promoters with a functional secretion phenotype.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding, co-IP, ChIP on c-myc/MMP3 promoters, siRNA knockdown reducing MMP3 secretion\",\n      \"pmids\": [\"17913746\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ePHD-BRCT6 contact unknown\", \"Breadth of TopBP1-SPBP coregulated genes not mapped\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated SPBP coactivation of the androgen receptor and competitive antagonism by Pax6, linking coregulator recruitment to DNA-binding-domain contacts.\",\n      \"evidence\": \"Cotransfection reporters, ChIP on probasin promoter, co-IP and domain mapping\",\n      \"pmids\": [\"21935435\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance in prostate tissue not tested\", \"Competition shown in overexpression context\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved how SPBP physically engages chromatin, identifying two independent nucleosome-binding domains and linking one to nuclear localization.\",\n      \"evidence\": \"In vitro nucleosome-binding with deletion constructs, FRAP, nuclear fractionation, immunofluorescence in HeLa\",\n      \"pmids\": [\"22081970\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Histone modification specificity of ePHD/ADD binding not defined\", \"In vivo genome-wide nucleosome targeting unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established evolutionary conservation and cross-braced zinc-finger topology of the SPBP C-terminal region, generalizing nucleosome-binding to the RAI1 homologue.\",\n      \"evidence\": \"Phylogenetic analysis, in vitro and yeast-cell interaction studies\",\n      \"pmids\": [\"24205348\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No experimentally determined high-resolution structure\", \"Functional consequence of conservation untested in vivo\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed SPBP within the NRF2 antioxidant program as a coactivator driving p62/SQSTM1 and autophagy-linked gene expression.\",\n      \"evidence\": \"ARE reporter assays, siRNA knockdown with IF/Western, cotransfection synergy, colocalization in nuclear speckles\",\n      \"pmids\": [\"24416372\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct SPBP-NRF2 contact not mapped\", \"ARE occupancy by SPBP not shown by ChIP\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked TCF20 loss-of-function mutations to autism spectrum disorder, connecting the coregulator to human neurodevelopmental disease.\",\n      \"evidence\": \"Cytogenetics, Sanger sequencing of TCF20 ORFs, exome sequencing identifying de novo and inherited variants\",\n      \"pmids\": [\"25228304\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Genetic association without protein-level functional assays in this study\", \"Causal mechanism of variants undefined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a developmental signaling axis showing TCF20 is required for cortical neurogenesis via TDG-mediated DNA demethylation controlling TCF-4.\",\n      \"evidence\": \"Conditional knockout mice, RNA-seq, ChIP-qPCR identifying TDG, epistasis rescue by TDG/TCF-4 overexpression\",\n      \"pmids\": [\"32510763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct TCF20 binding at the TDG locus vs indirect effect not fully separated\", \"Whether TCF20 acts as activator or repressor of TDG unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified the MeCP2-TCF20 chromatin complex and showed its disruption underlies Rett and MECP2 duplication phenotypes, integrating TCF20 into a neuronal epigenetic regulatory module.\",\n      \"evidence\": \"BioID proteomics, co-IP, in vivo genetic epistasis (Tcf20 reduction rescuing MECP2 overexpression mice), patient PHF14 mutation validation\",\n      \"pmids\": [\"35074918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and assembly order of the complex unknown\", \"Genome-wide MeCP2-TCF20 co-regulated targets only partially defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Broadened TCF20 phenotypes beyond brain, revealing roles in liver fibrosis, ECM gene regulation, and mitochondrial metabolism in knockout mice.\",\n      \"evidence\": \"Homologous recombination knockout, Seahorse metabolic assays, GC-MS proteomics, gene expression and behavioral phenotyping\",\n      \"pmids\": [\"37312667\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional targets driving metabolic phenotype not identified\", \"Tissue-specific mechanisms not separated from systemic effects\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated TCF20 control of dendritic arborization, spine formation, and synaptic protein expression, mechanistically linking it to synaptic gene programs.\",\n      \"evidence\": \"siRNA knockdown in rat cortical cultures, RNA-seq, synaptosomal Western blots, dendritic morphology imaging\",\n      \"pmids\": [\"39801227\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect regulation of individual synaptic genes not distinguished\", \"Whether changes reflect transcriptional coregulation by TCF20 at these loci untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended MeCP2-TCF20 complex function to osteogenesis, showing it suppresses HDAC1 to activate Wnt/\\u03b2-catenin signaling in periodontal ligament stem cells.\",\n      \"evidence\": \"IP-MS, RNA-seq, siRNA/overexpression, Western blot, ALP/ARS osteogenic assays\",\n      \"pmids\": [\"41094547\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct complex occupancy at the HDAC1 locus not shown\", \"Generalizability beyond this stem cell context unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TCF20 switches between coactivation and corepression, and what determines its genome-wide chromatin targeting within the MeCP2/RAI1/PHF14/HMG20A complex, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of TCF20 domains or complex\", \"Genome-wide direct binding map lacking\", \"Determinants of activator-vs-repressor behavior undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 3, 4, 7]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 3, 4, 7]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [5, 10]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 12]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [\n      \"MeCP2-TCF20-PHF14 chromatin complex\",\n      \"TCF20/PHF14 brain chromatin complex (MeCP2, RAI1, TCF20, PHF14, HMG20A)\"\n    ],\n    \"partners\": [\n      \"RNF4\",\n      \"TopBP1\",\n      \"MECP2\",\n      \"PHF14\",\n      \"AR\",\n      \"ESR1\",\n      \"PAX6\",\n      \"ETS1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}