{"gene":"TLE4","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":1996,"finding":"Mouse Grg4 (TLE4) mRNA is expressed in proliferating epithelial tissues undergoing mesenchymal induction, overlapping with Notch1 and Hes1 expression, but also in CNS and somites in cells adjacent to Grg3/Notch1/Hes1-expressing cells, suggesting a role in later stages of cell differentiation than other neurogenic gene homologues.","method":"cDNA cloning and in situ hybridization/expression analysis during mouse embryogenesis","journal":"Mechanisms of development","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, expression/localization data only, no functional mechanistic experiments performed on Grg4 protein activity","pmids":["8892234"],"is_preprint":false},{"year":2001,"finding":"Transcriptional repression by HES/E(spl) proteins requires recruitment of the TLE/Groucho corepressor via a conserved C-terminal WRPW tetrapeptide motif, establishing TLE4/Groucho as a corepressor physically recruited by HES-family bHLH repressors.","method":"Transcriptional repression assays, domain mutagenesis of WRPW motif, co-immunoprecipitation","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays with mutagenesis and co-IP in a single study, but TLE4/Grg4 is referenced as the recruited corepressor rather than being the primary subject of mechanistic study","pmids":["11486045"],"is_preprint":false},{"year":2000,"finding":"Chick Grg4 overexpression in the mesencephalon repressed tectum-organizing genes (En-2, Pax5, Fgf8, EphrinA2) and upregulated Pax6, antagonizing tectum-inducing activity of Pax5 when co-transfected. N-terminal domain fragments of Grg4 acted as dominant negatives, inducing En-2 expression and translocating to the nucleus in neuroepithelium, indicating Grg4 functions as a transcriptional repressor antagonizing tectum-organizing molecules.","method":"In ovo electroporation-mediated overexpression, dominant-negative truncation analysis, in situ hybridization for target gene expression","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function in vivo with defined transcriptional target readouts, single lab","pmids":["10772799"],"is_preprint":false},{"year":2003,"finding":"Grg4 directs tectal postmitotic cells to follow a late migratory pathway in the chick optic tectum; clonal misexpression caused cells to migrate to laminae h-j of the SGFS, massive misexpression disrupted lamina g, and morpholino knockdown or dominant-negative Grg4 produced the opposite effect, demonstrating Grg4 controls laminar fate of migrating tectal neurons.","method":"In ovo electroporation (gain-of-function and dominant-negative), morpholino antisense knockdown, histological analysis of tectal lamination","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with defined cellular phenotype, single lab, consistent results across multiple approaches","pmids":["12490552"],"is_preprint":false},{"year":2004,"finding":"PU.1 physically interacts with and recruits the Groucho family corepressor Grg4 (TLE4), and together with Pax5, PU.1 co-recruits Grg4 to repress IgH enhancer (HS1,2) and joining-chain promoter activity in B cells in a position-dependent manner. Grg4 protein levels decrease following B-cell activation, suggesting temporal regulation. This demonstrates Grg4 is a functional corepressor for PU.1/Pax5-mediated gene silencing in B lymphocytes.","method":"Co-immunoprecipitation (physical interaction), luciferase transcriptional reporter assays, western blot showing Grg4 downregulation upon B-cell activation","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal functional and physical interaction data with multiple reporter assays in a single lab study","pmids":["14993928"],"is_preprint":false},{"year":2006,"finding":"FoxD3 directly and physically interacts with Grg4 (TLE4) via a C-terminal eh1/GEH heptapeptide motif. Deletion and point mutagenesis of this motif abolished both transcriptional repression and mesoderm induction activities of FoxD3 in Xenopus. Grg4 enhanced FoxD3 transcriptional repression activity, while Grg5 (a dominant-inhibitory Groucho protein) reduced it. This establishes Grg4 as an essential corepressor recruited by FoxD3 for target gene repression and mesoderm induction.","method":"Co-immunoprecipitation (direct physical interaction), structure-function analysis with deletion and point mutagenesis of eh1/GEH motif, transcriptional reporter assays, Xenopus embryo microinjection with phenotypic readout","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct physical interaction confirmed by Co-IP, mutagenesis of interaction motif with both biochemical and in vivo functional consequences, multiple orthogonal methods in one study","pmids":["17138566"],"is_preprint":false},{"year":2009,"finding":"The homeodomain protein Cux1 directly interacts with Grg4 (TLE4) and recruits it to the p27kip1 promoter in developing kidney. Grg4 enhanced Cux1-mediated repression of p27kip1 promoter activity. ChIP assays confirmed co-occupancy of Cux1, Grg4, HDAC1, and HDAC3 at two separate p27kip1 promoter sites in newborn kidney tissue in vivo, and DNase I footprinting identified Cux1 binding sites on the p27kip1 promoter.","method":"Co-immunoprecipitation, luciferase promoter reporter assays, chromatin immunoprecipitation (ChIP) in vivo, DNase I footprinting","journal":"Gene","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (Co-IP, ChIP in vivo, reporter assays, footprinting) in single study, direct in vivo chromatin occupancy demonstrated","pmids":["19332113"],"is_preprint":false},{"year":2012,"finding":"SUMOylation of SoxE transcription factors promotes their recruitment of Grg4 (TLE4) as a corepressor while simultaneously displacing coactivators CBP/p300, converting SoxE from a transcriptional activator to a repressor in the neural crest. The SUMO-dependent interaction between SoxE and Grg4 was demonstrated by co-immunoprecipitation and is required for SoxE repressor function in early vertebrate embryos.","method":"Co-immunoprecipitation of SUMOylated SoxE with Grg4, transcriptional reporter assays comparing activator vs. repressor activity, Xenopus embryo functional assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with defined post-translational modification (SUMOylation) as switch, supported by transcriptional and in vivo functional data, multiple orthogonal methods","pmids":["22927467"],"is_preprint":false}],"current_model":"TLE4 (GRG4) is a transcriptional corepressor of the Groucho/TLE family that is recruited to target gene promoters through direct physical interactions with sequence-specific transcription factors (including FoxD3 via an eh1/GEH motif, Cux1, PU.1/Pax5, and SUMOylated SoxE proteins) to repress transcription in conjunction with histone deacetylases, and functions in vivo to regulate mesoderm induction, kidney cell proliferation (via p27kip1 repression), B-cell gene silencing, neural crest cell fate, and tectal laminar formation in the developing brain."},"narrative":{"mechanistic_narrative":"TLE4 (Grg4/GRG4) is a Groucho/TLE-family transcriptional corepressor that is recruited to target promoters through direct physical interactions with sequence-specific DNA-binding transcription factors to silence gene expression during development [PMID:17138566, PMID:19332113, PMID:22927467]. Recruitment is motif-dependent: HES-family bHLH repressors engage TLE4 through a C-terminal WRPW tetrapeptide [PMID:11486045], FoxD3 binds TLE4 via a C-terminal eh1/GEH heptapeptide whose mutation abolishes both repression and FoxD3-dependent mesoderm induction in Xenopus [PMID:17138566], and SUMOylation of SoxE factors switches them from activators to repressors by promoting TLE4 recruitment while displacing CBP/p300 coactivators in the neural crest [PMID:22927467]. TLE4 also partners with the homeodomain factor Cux1 and with PU.1/Pax5, co-occupying chromatin with histone deacetylases HDAC1 and HDAC3 at the p27kip1 promoter to repress kidney cell-cycle regulators and at the IgH enhancer and joining-chain promoter to silence genes in B lymphocytes [PMID:19332113, PMID:14993928]. Through these interactions TLE4 enforces transcriptional programs in mesoderm induction, neural crest fate, B-cell gene silencing, and patterning of the developing tectum, where it represses tectum-organizing genes and directs the laminar migratory fate of postmitotic neurons [PMID:10772799, PMID:12490552, PMID:17138566].","teleology":[{"year":1996,"claim":"Established where TLE4/Grg4 acts by mapping its expression to proliferating epithelia undergoing mesenchymal induction and to CNS and somites, framing it as a candidate regulator of later differentiation stages distinct from related neurogenic homologues.","evidence":"cDNA cloning and in situ hybridization during mouse embryogenesis","pmids":["8892234"],"confidence":"Low","gaps":["Expression-only data, no functional or biochemical test of Grg4 protein activity","No transcription factor partners identified","Correlation with Notch1/Hes1 does not establish a mechanistic link"]},{"year":2000,"claim":"Demonstrated in vivo that Grg4 acts as a transcriptional repressor in brain patterning by antagonizing tectum-organizing molecules, with N-terminal truncations acting as nuclear dominant negatives.","evidence":"In ovo electroporation overexpression and dominant-negative truncation analysis in chick mesencephalon with in situ target readouts (En-2, Pax5, Fgf8, EphrinA2, Pax6)","pmids":["10772799"],"confidence":"Medium","gaps":["Direct DNA-binding partner mediating repression at these loci not identified","Does not resolve which domains contact transcription factors versus chromatin machinery"]},{"year":2001,"claim":"Defined a recruitment grammar for TLE/Groucho corepressors by showing HES/E(spl) repressors engage them through a conserved C-terminal WRPW motif.","evidence":"Transcriptional repression assays, WRPW motif mutagenesis, and co-immunoprecipitation","pmids":["11486045"],"confidence":"Medium","gaps":["TLE4 referenced as the recruited corepressor rather than the primary subject","Does not establish TLE4-specific HES partners in a developmental context"]},{"year":2003,"claim":"Showed Grg4 controls a cellular fate decision, directing postmitotic tectal neurons into a late migratory laminar pathway, using reciprocal gain- and loss-of-function.","evidence":"In ovo electroporation (gain-of-function and dominant-negative), morpholino knockdown, and histological analysis of tectal lamination in chick","pmids":["12490552"],"confidence":"Medium","gaps":["Target genes mediating the laminar migration phenotype not defined","Transcription factor partner in this context not identified"]},{"year":2004,"claim":"Identified Grg4 as a functional corepressor for B-cell gene silencing, recruited by PU.1 and co-recruited with Pax5, and revealed temporal control via Grg4 downregulation upon B-cell activation.","evidence":"Co-immunoprecipitation, luciferase reporter assays at the IgH enhancer and J-chain promoter, and western blot in B cells","pmids":["14993928"],"confidence":"Medium","gaps":["Chromatin occupancy at endogenous loci not directly shown","Mechanism linking B-cell activation to Grg4 protein loss unresolved"]},{"year":2006,"claim":"Established a direct, motif-defined recruitment mechanism by showing FoxD3 binds Grg4 through a C-terminal eh1/GEH heptapeptide required for both repression and mesoderm induction.","evidence":"Co-immunoprecipitation, deletion and point mutagenesis of the eh1/GEH motif, reporter assays, and Xenopus embryo microinjection","pmids":["17138566"],"confidence":"High","gaps":["Structural basis of the eh1/Grg4 interface not resolved","Downstream FoxD3 target genes repressed by Grg4 not enumerated"]},{"year":2009,"claim":"Demonstrated in vivo chromatin co-occupancy linking Grg4 to a defined repression complex and target, showing Cux1 recruits Grg4 with HDAC1/HDAC3 to the p27kip1 promoter in developing kidney.","evidence":"Co-immunoprecipitation, luciferase reporters, in vivo ChIP, and DNase I footprinting in newborn kidney","pmids":["19332113"],"confidence":"High","gaps":["Whether HDAC recruitment is direct to Grg4 or via Cux1 not dissected","Functional consequence of p27kip1 repression on kidney proliferation not quantified in this study"]},{"year":2012,"claim":"Revealed a post-translational switch controlling Grg4 recruitment, where SUMOylation of SoxE factors promotes Grg4 binding while displacing CBP/p300, converting activators into repressors in the neural crest.","evidence":"Co-immunoprecipitation of SUMOylated SoxE with Grg4, activator-versus-repressor reporter assays, and Xenopus functional assays","pmids":["22927467"],"confidence":"High","gaps":["Structural mechanism by which SUMO creates the Grg4 docking surface not resolved","Endogenous SoxE/Grg4 target genes in neural crest not mapped"]},{"year":null,"claim":"How TLE4 selects among its many transcription-factor partners in different tissues, and the structural basis and chromatin-remodeling consequences of its recruitment, remain unresolved.","evidence":"No discovery in the timeline addresses partner selectivity or a structural model of TLE4 corepressor assembly","pmids":[],"confidence":"Low","gaps":["No structural model of TLE4 bound to eh1/WRPW/SUMO motifs","Genome-wide TLE4 target catalogue absent","Mechanism integrating HDAC activity with TLE4 across tissues not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,4,5,6,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,6,7]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,5,6]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,6]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,5,6,7]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,3,5,7]}],"complexes":[],"partners":["FOXD3","CUX1","PU.1","PAX5","SOX9","HES1","HDAC1","HDAC3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q04727","full_name":"Transducin-like enhancer protein 4","aliases":["Grg-4","Groucho-related protein 4"],"length_aa":773,"mass_kda":83.8,"function":"Transcriptional corepressor that binds to a number of transcription factors. Inhibits the transcriptional activation mediated by PAX5, and by CTNNB1 and TCF family members in Wnt signaling. The effects of full-length TLE family members may be modulated by association with dominant-negative AES. Essential for the transcriptional repressor activity of SIX3 during retina and lens development and for SIX3 transcriptional auto-repression (By similarity). Involved in transcriptional repression of GNRHR and enhances MSX1-mediated transcriptional repression of CGA/alpha-GSU (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q04727/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TLE4","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TLE4","total_profiled":1310},"omim":[{"mim_id":"617045","title":"ZINC FINGER PROTEIN 703; ZNF703","url":"https://www.omim.org/entry/617045"},{"mim_id":"605132","title":"TLE FAMILY MEMBER 4, TRANSCRIPTIONAL COREPRESSOR; TLE4","url":"https://www.omim.org/entry/605132"},{"mim_id":"167409","title":"PAIRED BOX GENE 2; PAX2","url":"https://www.omim.org/entry/167409"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Mitochondria","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":94.4}],"url":"https://www.proteinatlas.org/search/TLE4"},"hgnc":{"alias_symbol":["E(spl)","ESG","GRG4"],"prev_symbol":[]},"alphafold":{"accession":"Q04727","domains":[{"cath_id":"2.130.10.10","chopping":"448-480_664-745","consensus_level":"medium","plddt":95.9607,"start":448,"end":745},{"cath_id":"2.130.10.10","chopping":"481-663_746-773","consensus_level":"medium","plddt":96.2401,"start":481,"end":773}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q04727","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q04727-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q04727-F1-predicted_aligned_error_v6.png","plddt_mean":68.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TLE4","jax_strain_url":"https://www.jax.org/strain/search?query=TLE4"},"sequence":{"accession":"Q04727","fasta_url":"https://rest.uniprot.org/uniprotkb/Q04727.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q04727/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q04727"}},"corpus_meta":[{"pmid":"28988769","id":"PMC_28988769","title":"Comprehensive Molecular Characterization of Muscle-Invasive Bladder Cancer.","date":"2017","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/28988769","citation_count":1786,"is_preprint":false},{"pmid":"7566092","id":"PMC_7566092","title":"Signalling downstream of activated mammalian Notch.","date":"1995","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/7566092","citation_count":1214,"is_preprint":false},{"pmid":"12548545","id":"PMC_12548545","title":"HES and HERP families: multiple effectors of the Notch signaling pathway.","date":"2003","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/12548545","citation_count":1019,"is_preprint":false},{"pmid":"33706364","id":"PMC_33706364","title":"Sensitivity of SARS-CoV-2 B.1.1.7 to mRNA vaccine-elicited antibodies.","date":"2021","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/33706364","citation_count":552,"is_preprint":false},{"pmid":"38238616","id":"PMC_38238616","title":"Safety, efficacy and determinants of response of allogeneic CD19-specific CAR-NK cells in CD19+ B cell tumors: a phase 1/2 trial.","date":"2024","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/38238616","citation_count":394,"is_preprint":false},{"pmid":"9310319","id":"PMC_9310319","title":"Feed-back mechanisms affecting Notch activation at the dorsoventral boundary in the Drosophila wing.","date":"1997","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/9310319","citation_count":323,"is_preprint":false},{"pmid":"17586813","id":"PMC_17586813","title":"Delta-Notch--and then? 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neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/9171444","citation_count":18,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48015,"output_tokens":2911,"usd":0.093855,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9379,"output_tokens":3077,"usd":0.06191,"stage2_stop_reason":"end_turn"},"total_usd":0.155765,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at these 100 papers, I need to identify those that are actually about TLE4 (also known as GRG4, a Groucho-related gene/corepressor) versus papers about E(spl) (Enhancer of split, which is a different gene - the bHLH transcriptional repressor genes of the E(spl) complex in Drosophila). \n\nTLE4/GRG4 is the mammalian/vertebrate Groucho-related corepressor protein, NOT the E(spl) bHLH proteins themselves. The HGNC aliases listed are \"E(spl), GRG4\" - but E(spl) here refers to the groucho gene that is part of the Enhancer of split complex, not the bHLH genes. GRG4 is clearly the mouse/vertebrate ortholog of Groucho.\n\nI need to focus on papers about GRG4/TLE4 as a corepressor, not papers about E(spl) bHLH proteins.\n\nRelevant papers:\n- PMID:8892234 (Koop et al., 1996) - Grg4 expression in mouse embryos\n- PMID:17138566 (Yaklichkin et al., 2006) - FoxD3 and Grg4 physical interaction\n- PMID:14993928 (Linderson et al., 2004) - PU.1/Pax5/Grg4 co-recruitment\n- PMID:22927467 (Lee et al., 2012) - SUMOylated SoxE/Grg4 interaction\n- PMID:19332113 (Sharma et al., 2009) - Cux1/Grg4 interaction\n- PMID:10772799 (Sugiyama et al., 2000) - Chick Grg4 in tectum development\n- PMID:12490552 (Sugiyama & Nakamura, 2003) - Grg4 in tectal laminar formation\n- PMID:11486045 (Iso et al., 2001) - mentions TLE/Groucho recruitment by HES via WRPW motif\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"Mouse Grg4 (TLE4) mRNA is expressed in proliferating epithelial tissues undergoing mesenchymal induction, overlapping with Notch1 and Hes1 expression, but also in CNS and somites in cells adjacent to Grg3/Notch1/Hes1-expressing cells, suggesting a role in later stages of cell differentiation than other neurogenic gene homologues.\",\n      \"method\": \"cDNA cloning and in situ hybridization/expression analysis during mouse embryogenesis\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, expression/localization data only, no functional mechanistic experiments performed on Grg4 protein activity\",\n      \"pmids\": [\"8892234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Transcriptional repression by HES/E(spl) proteins requires recruitment of the TLE/Groucho corepressor via a conserved C-terminal WRPW tetrapeptide motif, establishing TLE4/Groucho as a corepressor physically recruited by HES-family bHLH repressors.\",\n      \"method\": \"Transcriptional repression assays, domain mutagenesis of WRPW motif, co-immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays with mutagenesis and co-IP in a single study, but TLE4/Grg4 is referenced as the recruited corepressor rather than being the primary subject of mechanistic study\",\n      \"pmids\": [\"11486045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Chick Grg4 overexpression in the mesencephalon repressed tectum-organizing genes (En-2, Pax5, Fgf8, EphrinA2) and upregulated Pax6, antagonizing tectum-inducing activity of Pax5 when co-transfected. N-terminal domain fragments of Grg4 acted as dominant negatives, inducing En-2 expression and translocating to the nucleus in neuroepithelium, indicating Grg4 functions as a transcriptional repressor antagonizing tectum-organizing molecules.\",\n      \"method\": \"In ovo electroporation-mediated overexpression, dominant-negative truncation analysis, in situ hybridization for target gene expression\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function in vivo with defined transcriptional target readouts, single lab\",\n      \"pmids\": [\"10772799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Grg4 directs tectal postmitotic cells to follow a late migratory pathway in the chick optic tectum; clonal misexpression caused cells to migrate to laminae h-j of the SGFS, massive misexpression disrupted lamina g, and morpholino knockdown or dominant-negative Grg4 produced the opposite effect, demonstrating Grg4 controls laminar fate of migrating tectal neurons.\",\n      \"method\": \"In ovo electroporation (gain-of-function and dominant-negative), morpholino antisense knockdown, histological analysis of tectal lamination\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with defined cellular phenotype, single lab, consistent results across multiple approaches\",\n      \"pmids\": [\"12490552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PU.1 physically interacts with and recruits the Groucho family corepressor Grg4 (TLE4), and together with Pax5, PU.1 co-recruits Grg4 to repress IgH enhancer (HS1,2) and joining-chain promoter activity in B cells in a position-dependent manner. Grg4 protein levels decrease following B-cell activation, suggesting temporal regulation. This demonstrates Grg4 is a functional corepressor for PU.1/Pax5-mediated gene silencing in B lymphocytes.\",\n      \"method\": \"Co-immunoprecipitation (physical interaction), luciferase transcriptional reporter assays, western blot showing Grg4 downregulation upon B-cell activation\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal functional and physical interaction data with multiple reporter assays in a single lab study\",\n      \"pmids\": [\"14993928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FoxD3 directly and physically interacts with Grg4 (TLE4) via a C-terminal eh1/GEH heptapeptide motif. Deletion and point mutagenesis of this motif abolished both transcriptional repression and mesoderm induction activities of FoxD3 in Xenopus. Grg4 enhanced FoxD3 transcriptional repression activity, while Grg5 (a dominant-inhibitory Groucho protein) reduced it. This establishes Grg4 as an essential corepressor recruited by FoxD3 for target gene repression and mesoderm induction.\",\n      \"method\": \"Co-immunoprecipitation (direct physical interaction), structure-function analysis with deletion and point mutagenesis of eh1/GEH motif, transcriptional reporter assays, Xenopus embryo microinjection with phenotypic readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct physical interaction confirmed by Co-IP, mutagenesis of interaction motif with both biochemical and in vivo functional consequences, multiple orthogonal methods in one study\",\n      \"pmids\": [\"17138566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The homeodomain protein Cux1 directly interacts with Grg4 (TLE4) and recruits it to the p27kip1 promoter in developing kidney. Grg4 enhanced Cux1-mediated repression of p27kip1 promoter activity. ChIP assays confirmed co-occupancy of Cux1, Grg4, HDAC1, and HDAC3 at two separate p27kip1 promoter sites in newborn kidney tissue in vivo, and DNase I footprinting identified Cux1 binding sites on the p27kip1 promoter.\",\n      \"method\": \"Co-immunoprecipitation, luciferase promoter reporter assays, chromatin immunoprecipitation (ChIP) in vivo, DNase I footprinting\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (Co-IP, ChIP in vivo, reporter assays, footprinting) in single study, direct in vivo chromatin occupancy demonstrated\",\n      \"pmids\": [\"19332113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SUMOylation of SoxE transcription factors promotes their recruitment of Grg4 (TLE4) as a corepressor while simultaneously displacing coactivators CBP/p300, converting SoxE from a transcriptional activator to a repressor in the neural crest. The SUMO-dependent interaction between SoxE and Grg4 was demonstrated by co-immunoprecipitation and is required for SoxE repressor function in early vertebrate embryos.\",\n      \"method\": \"Co-immunoprecipitation of SUMOylated SoxE with Grg4, transcriptional reporter assays comparing activator vs. repressor activity, Xenopus embryo functional assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with defined post-translational modification (SUMOylation) as switch, supported by transcriptional and in vivo functional data, multiple orthogonal methods\",\n      \"pmids\": [\"22927467\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TLE4 (GRG4) is a transcriptional corepressor of the Groucho/TLE family that is recruited to target gene promoters through direct physical interactions with sequence-specific transcription factors (including FoxD3 via an eh1/GEH motif, Cux1, PU.1/Pax5, and SUMOylated SoxE proteins) to repress transcription in conjunction with histone deacetylases, and functions in vivo to regulate mesoderm induction, kidney cell proliferation (via p27kip1 repression), B-cell gene silencing, neural crest cell fate, and tectal laminar formation in the developing brain.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TLE4 (Grg4/GRG4) is a Groucho/TLE-family transcriptional corepressor that is recruited to target promoters through direct physical interactions with sequence-specific DNA-binding transcription factors to silence gene expression during development [#5, #6, #7]. Recruitment is motif-dependent: HES-family bHLH repressors engage TLE4 through a C-terminal WRPW tetrapeptide [#1], FoxD3 binds TLE4 via a C-terminal eh1/GEH heptapeptide whose mutation abolishes both repression and FoxD3-dependent mesoderm induction in Xenopus [#5], and SUMOylation of SoxE factors switches them from activators to repressors by promoting TLE4 recruitment while displacing CBP/p300 coactivators in the neural crest [#7]. TLE4 also partners with the homeodomain factor Cux1 and with PU.1/Pax5, co-occupying chromatin with histone deacetylases HDAC1 and HDAC3 at the p27kip1 promoter to repress kidney cell-cycle regulators and at the IgH enhancer and joining-chain promoter to silence genes in B lymphocytes [#6, #4]. Through these interactions TLE4 enforces transcriptional programs in mesoderm induction, neural crest fate, B-cell gene silencing, and patterning of the developing tectum, where it represses tectum-organizing genes and directs the laminar migratory fate of postmitotic neurons [#2, #3, #5].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established where TLE4/Grg4 acts by mapping its expression to proliferating epithelia undergoing mesenchymal induction and to CNS and somites, framing it as a candidate regulator of later differentiation stages distinct from related neurogenic homologues.\",\n      \"evidence\": \"cDNA cloning and in situ hybridization during mouse embryogenesis\",\n      \"pmids\": [\"8892234\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Expression-only data, no functional or biochemical test of Grg4 protein activity\", \"No transcription factor partners identified\", \"Correlation with Notch1/Hes1 does not establish a mechanistic link\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrated in vivo that Grg4 acts as a transcriptional repressor in brain patterning by antagonizing tectum-organizing molecules, with N-terminal truncations acting as nuclear dominant negatives.\",\n      \"evidence\": \"In ovo electroporation overexpression and dominant-negative truncation analysis in chick mesencephalon with in situ target readouts (En-2, Pax5, Fgf8, EphrinA2, Pax6)\",\n      \"pmids\": [\"10772799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DNA-binding partner mediating repression at these loci not identified\", \"Does not resolve which domains contact transcription factors versus chromatin machinery\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined a recruitment grammar for TLE/Groucho corepressors by showing HES/E(spl) repressors engage them through a conserved C-terminal WRPW motif.\",\n      \"evidence\": \"Transcriptional repression assays, WRPW motif mutagenesis, and co-immunoprecipitation\",\n      \"pmids\": [\"11486045\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"TLE4 referenced as the recruited corepressor rather than the primary subject\", \"Does not establish TLE4-specific HES partners in a developmental context\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed Grg4 controls a cellular fate decision, directing postmitotic tectal neurons into a late migratory laminar pathway, using reciprocal gain- and loss-of-function.\",\n      \"evidence\": \"In ovo electroporation (gain-of-function and dominant-negative), morpholino knockdown, and histological analysis of tectal lamination in chick\",\n      \"pmids\": [\"12490552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Target genes mediating the laminar migration phenotype not defined\", \"Transcription factor partner in this context not identified\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified Grg4 as a functional corepressor for B-cell gene silencing, recruited by PU.1 and co-recruited with Pax5, and revealed temporal control via Grg4 downregulation upon B-cell activation.\",\n      \"evidence\": \"Co-immunoprecipitation, luciferase reporter assays at the IgH enhancer and J-chain promoter, and western blot in B cells\",\n      \"pmids\": [\"14993928\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Chromatin occupancy at endogenous loci not directly shown\", \"Mechanism linking B-cell activation to Grg4 protein loss unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established a direct, motif-defined recruitment mechanism by showing FoxD3 binds Grg4 through a C-terminal eh1/GEH heptapeptide required for both repression and mesoderm induction.\",\n      \"evidence\": \"Co-immunoprecipitation, deletion and point mutagenesis of the eh1/GEH motif, reporter assays, and Xenopus embryo microinjection\",\n      \"pmids\": [\"17138566\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the eh1/Grg4 interface not resolved\", \"Downstream FoxD3 target genes repressed by Grg4 not enumerated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated in vivo chromatin co-occupancy linking Grg4 to a defined repression complex and target, showing Cux1 recruits Grg4 with HDAC1/HDAC3 to the p27kip1 promoter in developing kidney.\",\n      \"evidence\": \"Co-immunoprecipitation, luciferase reporters, in vivo ChIP, and DNase I footprinting in newborn kidney\",\n      \"pmids\": [\"19332113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HDAC recruitment is direct to Grg4 or via Cux1 not dissected\", \"Functional consequence of p27kip1 repression on kidney proliferation not quantified in this study\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed a post-translational switch controlling Grg4 recruitment, where SUMOylation of SoxE factors promotes Grg4 binding while displacing CBP/p300, converting activators into repressors in the neural crest.\",\n      \"evidence\": \"Co-immunoprecipitation of SUMOylated SoxE with Grg4, activator-versus-repressor reporter assays, and Xenopus functional assays\",\n      \"pmids\": [\"22927467\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mechanism by which SUMO creates the Grg4 docking surface not resolved\", \"Endogenous SoxE/Grg4 target genes in neural crest not mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TLE4 selects among its many transcription-factor partners in different tissues, and the structural basis and chromatin-remodeling consequences of its recruitment, remain unresolved.\",\n      \"evidence\": \"No discovery in the timeline addresses partner selectivity or a structural model of TLE4 corepressor assembly\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of TLE4 bound to eh1/WRPW/SUMO motifs\", \"Genome-wide TLE4 target catalogue absent\", \"Mechanism integrating HDAC activity with TLE4 across tissues not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 4, 5, 6, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 6, 7]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 5, 6, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 3, 5, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FOXD3\", \"CUX1\", \"PU.1\", \"PAX5\", \"SOX9\", \"HES1\", \"HDAC1\", \"HDAC3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}