{"gene":"TGIF2","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2001,"finding":"TGIF2 represses transcription by recruiting histone deacetylase (HDAC1) and interacting with TGF-β-activated Smads; unlike TGIF1, TGIF2 cannot interact with the corepressor CtBP, making it a context-independent repressor.","method":"Co-immunoprecipitation, transcriptional reporter assays, DNA-binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and functional reporter assays with multiple mechanistic readouts in a highly-cited study","pmids":["11427533"],"is_preprint":false},{"year":2000,"finding":"TGIF2 is a TALE-superclass homeodomain protein that localizes to the nucleus via a putative nuclear localization signal, confirmed by transfection of epitope-tagged cDNA.","method":"Epitope-tagged cDNA transfection and nuclear localization assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — single localization experiment with functional implication but limited mechanistic follow-up","pmids":["11006116"],"is_preprint":false},{"year":2006,"finding":"TGIF2 interacts with the transcriptional corepressor mSin3; both full-length and alternatively spliced short forms of mouse Tgif2 function as active transcriptional repressors capable of repressing TGF-β-dependent and -independent transcription.","method":"Co-immunoprecipitation, transcriptional reporter assays, RT-PCR splice variant characterization","journal":"BMC molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus functional reporter assays, single lab","pmids":["16436215"],"is_preprint":false},{"year":2010,"finding":"Tgif1 and Tgif2 function redundantly as transcriptional co-repressors that limit Nodal signaling; double loss-of-function causes gastrulation failure and left-right asymmetry defects, and genetic reduction of Nodal dosage partially rescues these phenotypes, placing Tgifs as negative regulators upstream of Nodal transcriptional response.","method":"Genetic epistasis (compound null mouse mutants, conditional epiblast deletion, Nodal dose reduction rescue)","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — rigorous genetic epistasis with multiple conditional alleles and dose-response rescue, replicated across conditions","pmids":["20040491"],"is_preprint":false},{"year":2016,"finding":"Tgif1 and Tgif2 regulate axial patterning; loss of Tgif1 causes posterior vertebral transformation with altered Hoxc6 expression, and combined Tgif1/Tgif2 mutations increase severity, demonstrating functional redundancy in retinoic-acid-mediated Hox regulation.","method":"Loss-of-function mouse genetics (single and compound null mutants), retinoic acid exposure, Hoxc6 expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — clean in vivo genetic analysis with defined phenotypic readout, single lab","pmids":["27187787"],"is_preprint":false},{"year":2017,"finding":"TGIF2 acts as a developmental regulator of the pancreas-versus-liver fate decision; forced expression of Tgif2 in hepatocytes represses hepatic identity genes and induces a pancreatic progenitor-like transcriptional program both ex vivo and in vivo, demonstrating its sufficiency for lineage reprogramming.","method":"In vivo adeno-associated viral overexpression in mouse hepatocytes, ex vivo hepatocyte culture, transcriptome profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vivo and ex vivo experiments with transcriptome-level validation","pmids":["28193997"],"is_preprint":false},{"year":2017,"finding":"TGIF1 binds to a conserved TGIF consensus site 5' of the Evi5l gene and represses its expression; loss of Tgif1 and Tgif2 increases Evi5l expression, decreases primary cilia number, and reduces Shh pathway transcriptional response in MEFs; knockdown of Evi5l partially restores cilia and Shh signaling in double-null MEFs.","method":"ChIP, transcriptome profiling, siRNA knockdown, primary cilia quantification, Shh pathway reporter assays in MEFs","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — ChIP plus genetic epistasis with functional rescue, multiple orthogonal methods","pmids":["27956704"],"is_preprint":false},{"year":2016,"finding":"Tgif2 participates in photoreceptor cell differentiation in the early mouse retina; shRNA knockdown decreases rod photoreceptors and increases cones, while conditional Tgif2 overexpression causes abnormal nuclear localization of cone photoreceptors.","method":"shRNA knockdown in retinal explants, conditional knock-in mouse, ERG functional testing","journal":"Experimental eye research","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo and ex vivo loss- and gain-of-function with defined cellular phenotype, single lab","pmids":["27639517"],"is_preprint":false},{"year":2019,"finding":"EGFR-RAS-ERK signaling phosphorylates TGIF2 and increases its protein stability; phosphorylation is required for TGIF2-promoted cancer stem cell properties and OCT4 promoter binding, as phosphorylation-deficient TGIF2 mutants lose these functions.","method":"Phosphorylation-deficient mutagenesis, luciferase/ChIP reporter assays, xenograft mouse models","journal":"Signal transduction and targeted therapy","confidence":"High","confidence_rationale":"Tier 1-2 — site-directed mutagenesis combined with ChIP and in vivo xenograft validation","pmids":["31871777"],"is_preprint":false},{"year":2023,"finding":"Phosphorylation of TGIF2 by EGFR/ERK signaling is required for TGIF2 to recruit HDAC1 to the E-cadherin promoter and suppress E-cadherin transcription, thereby promoting EMT and metastasis in lung adenocarcinoma; phosphorylation-deficient TGIF2 mutants cannot recruit HDAC1 or suppress E-cadherin.","method":"Co-immunoprecipitation (TGIF2-HDAC1 interaction), ChIP, dual-luciferase reporter, phosphorylation-deficient mutagenesis, xenograft mouse models","journal":"BMC cancer","confidence":"High","confidence_rationale":"Tier 1-2 — reciprocal Co-IP plus ChIP, mutagenesis, and in vivo validation in single study","pmids":["36647029"],"is_preprint":false},{"year":2018,"finding":"Nuclear PKM2 promotes post-translational degradation of TGIF2 protein via the ubiquitin-proteasome system during EMT in oral squamous cell carcinoma; TGIF2 mRNA and protein levels dissociate, and proteasome inhibition with MG132 restores TGIF2 protein.","method":"MG132 proteasome inhibition assay, Western blot, PKM2 knockdown, mRNA/protein expression mismatch analysis","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological proteasome inhibition plus knockdown with defined mechanistic readout, single lab","pmids":["30333907"],"is_preprint":false},{"year":2022,"finding":"JICD1 (Jagged1 intracellular domain) forms a transcriptional complex with DDX17, SMAD3, and TGIF2 to increase SOX2 expression, driving oncogenic transformation; TGIF2 is thus a component of a transcriptional complex promoting cancer stem cell properties.","method":"Co-immunoprecipitation, ChIP-seq, proteomics, transcriptome analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP supported by ChIP-seq and proteomics, multiple orthogonal methods","pmids":["36417870"],"is_preprint":false},{"year":2020,"finding":"TGIF2 is an endogenous repressor of TGF-β/Smad2/3 signaling; miR-181c-5p targets the 3'UTR of TGIF2 mRNA, reduces TGIF2 protein, and elevates Smad2/3 phosphorylation to promote pancreatic progenitor differentiation from hiPSCs.","method":"Luciferase 3'UTR reporter assay, Western blot, Smad2/3 phosphorylation assay, lentiviral overexpression","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — 3'UTR validation plus signaling pathway readout, single lab","pmids":["32541687"],"is_preprint":false},{"year":2017,"finding":"TGIF2 represses FCMR transcription by directly binding to the FCMR gene promoter in cervical cancer cells, and TGIF2-driven metastasis is partially dependent on this FCMR suppression.","method":"Luciferase promoter assay, shRNA knockdown, in vivo nude mouse metastasis model","journal":"European review for medical and pharmacological sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — luciferase promoter assay with in vivo confirmation, single lab","pmids":["32572908"],"is_preprint":false},{"year":2025,"finding":"TGIF2 controls neural stem cell (NSC) fate maintenance by interacting with the SIN3A/HDAC repressor complex to suppress neuronal differentiation genes; loss or gain of TGIF2 in cortical NSCs shifts the balance between self-renewal and neuronal differentiation.","method":"RNA-seq, ATAC-seq, in vitro and in vivo overexpression/knockdown, co-immunoprecipitation with SIN3A/HDAC complex","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — multiomic plus functional in vivo experiments, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.02.13.635953"],"is_preprint":true},{"year":2022,"finding":"TGIF2 downregulation in autistic mice is associated with inactivation of the Wnt/β-catenin signaling pathway; overexpression of TGIF2 suppresses neuronal apoptosis and autism-like symptoms. The histone demethylase LSD1 binds the TGIF2 promoter and is associated with H3K4me1 reduction and TGIF2 downregulation.","method":"ChIP-qPCR, adenovirus-mediated overexpression in vivo, behavioral tests, pathway analysis","journal":"Brain and behavior","confidence":"Medium","confidence_rationale":"Tier 2-3 — ChIP-qPCR plus in vivo rescue, single lab with moderate mechanistic depth","pmids":["35592894"],"is_preprint":false},{"year":2025,"finding":"TGIF2 transcriptionally upregulates HMGB3 by binding the HMGB3 promoter (confirmed by luciferase reporter and ChIP assays); HMGB3 then promotes TGF-β signaling through TLR3, driving esophageal squamous cell carcinoma proliferation and metastasis.","method":"Luciferase reporter assay, ChIP, co-immunoprecipitation, RNA-seq","journal":"Genes & diseases","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and luciferase reporter validation of direct promoter binding, single lab","pmids":["41716633"],"is_preprint":false},{"year":2025,"finding":"Smad2 cooperates with TGIF2 to co-regulate the SOX2 promoter, activating SOX2 expression; SOX2 in turn transactivates EGFR/MAPK signaling that promotes TGIF2 nuclear translocation, forming a positive feedback loop driving EMT and cancer stem cell properties in pancreatic cancer.","method":"ChIP, co-immunoprecipitation, siRNA rescue experiments, luciferase reporter, in vivo xenograft","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus Co-IP and functional rescue, single lab","pmids":["39781447"],"is_preprint":false}],"current_model":"TGIF2 is a TALE-homeodomain transcriptional repressor that acts by recruiting HDAC1 and the mSin3 corepressor complex (but not CtBP) to limit TGF-β/Nodal–Smad signaling and directly repress target gene promoters; its repressive activity and stability are enhanced by EGFR/ERK-mediated phosphorylation, and it participates in broader transcriptional complexes (e.g., with SMAD3/DDX17/JICD1) to regulate cell fate decisions including gastrulation, neural stem cell maintenance, pancreas-liver lineage choice, and cancer stemness."},"narrative":{"teleology":[{"year":2000,"claim":"Establishing TGIF2 as a nuclear TALE-homeodomain protein resolved the basic subcellular context in which it operates.","evidence":"Epitope-tagged cDNA transfection with nuclear localization assay in mammalian cells","pmids":["11006116"],"confidence":"Medium","gaps":["No DNA-binding specificity or target genes identified at this stage","Functional role beyond nuclear localization uncharacterized"]},{"year":2001,"claim":"Demonstrating that TGIF2 recruits HDAC1 and interacts with TGF-β-activated Smads — but unlike TGIF1 cannot bind CtBP — established it as a context-independent transcriptional repressor that attenuates Smad signaling.","evidence":"Reciprocal co-immunoprecipitation, transcriptional reporter assays, and DNA-binding assays","pmids":["11427533"],"confidence":"High","gaps":["Endogenous chromatin targets not identified","In vivo requirement not tested"]},{"year":2006,"claim":"Identification of mSin3 as an additional corepressor partner and characterization of splice variants showed that TGIF2 represses both TGF-β-dependent and -independent transcription through multiple corepressor complexes.","evidence":"Co-immunoprecipitation and transcriptional reporter assays with full-length and short splice forms of mouse Tgif2","pmids":["16436215"],"confidence":"Medium","gaps":["Relative contribution of HDAC1 vs. mSin3 recruitment not dissected","No in vivo confirmation of splice-variant-specific functions"]},{"year":2010,"claim":"Genetic epistasis in compound-null mice proved that Tgif1 and Tgif2 redundantly limit Nodal signaling in vivo, as their combined loss caused gastrulation failure rescuable by reducing Nodal dosage.","evidence":"Compound null and conditional epiblast-deleted mouse mutants with Nodal dose-reduction rescue","pmids":["20040491"],"confidence":"High","gaps":["Direct chromatin targets mediating Nodal repression not mapped","Individual contribution of TGIF2 vs. TGIF1 in this context remains unclear"]},{"year":2016,"claim":"Extending the developmental scope, loss-of-function studies showed TGIF2 contributes redundantly with TGIF1 to axial patterning via Hox gene regulation, and independently regulates photoreceptor rod vs. cone fate in the retina.","evidence":"Single and compound null mouse mutants with Hoxc6 expression analysis; shRNA knockdown and conditional overexpression in retinal explants","pmids":["27187787","27639517"],"confidence":"Medium","gaps":["Direct promoter binding at Hox loci not demonstrated","Mechanism linking TGIF2 to rod/cone specification unknown"]},{"year":2017,"claim":"Three studies collectively broadened TGIF2's role: forced expression in hepatocytes induced a pancreatic progenitor-like program, loss of Tgif1/2 derepressed Evi5l to reduce primary cilia and Shh signaling, and TGIF2 was found to directly bind and repress the FCMR promoter to promote metastasis.","evidence":"AAV-mediated Tgif2 overexpression in mouse hepatocytes with transcriptome profiling; ChIP, siRNA rescue, and cilia quantification in MEFs; luciferase promoter assay and nude mouse metastasis model","pmids":["28193997","27956704","32572908"],"confidence":"High","gaps":["Endogenous requirement for TGIF2 in pancreas specification not tested (gain-of-function only)","Whether TGIF2 directly binds Evi5l promoter (ChIP was for TGIF1)"]},{"year":2018,"claim":"Showing that nuclear PKM2 targets TGIF2 for ubiquitin-proteasome-dependent degradation revealed a post-translational control mechanism governing TGIF2 protein levels.","evidence":"MG132 proteasome inhibition, PKM2 knockdown, mRNA/protein discordance analysis in oral squamous cell carcinoma","pmids":["30333907"],"confidence":"Medium","gaps":["E3 ligase mediating TGIF2 ubiquitination not identified","Direct PKM2–TGIF2 physical interaction not shown"]},{"year":2019,"claim":"EGFR/RAS/ERK-mediated phosphorylation was shown to stabilize TGIF2 protein and be required for OCT4 promoter binding and cancer stem cell properties, linking upstream signaling to TGIF2 transcriptional activity.","evidence":"Phosphorylation-deficient mutagenesis, ChIP, luciferase reporter assays, and xenograft mouse models","pmids":["31871777"],"confidence":"High","gaps":["Specific phosphorylation sites and their individual contributions not fully mapped","Whether phosphorylation controls all TGIF2 targets or a subset is unknown"]},{"year":2022,"claim":"Two studies expanded TGIF2's transcriptional partnerships: it was identified as a component of a JICD1–DDX17–SMAD3–TGIF2 complex that activates SOX2 to drive cancer stemness, and separately, LSD1-mediated epigenetic silencing of the TGIF2 promoter was linked to neuronal apoptosis in an autism model.","evidence":"Co-IP, ChIP-seq, and proteomics for the JICD1 complex; ChIP-qPCR and adenoviral overexpression with behavioral testing in mice","pmids":["36417870","35592894"],"confidence":"High","gaps":["Whether TGIF2 acts as repressor or activator in the JICD1 complex is ambiguous","Causal role of TGIF2 downregulation in autism pathogenesis not established"]},{"year":2023,"claim":"ERK-dependent phosphorylation was mechanistically linked to HDAC1 recruitment at the E-cadherin promoter, showing that phosphorylation controls the repressor–corepressor interaction driving EMT.","evidence":"Reciprocal Co-IP of TGIF2–HDAC1, ChIP on E-cadherin promoter, phosphorylation-deficient mutants, and xenograft models in lung adenocarcinoma","pmids":["36647029"],"confidence":"High","gaps":["Structural basis of phosphorylation-dependent HDAC1 recruitment unknown","Genome-wide scope of phospho-TGIF2-dependent repression not determined"]},{"year":2025,"claim":"Recent work identified a TGIF2–Smad2–SOX2–EGFR positive feedback loop in pancreatic cancer, TGIF2 transcriptional activation of HMGB3 in esophageal cancer, and TGIF2 interaction with SIN3A/HDAC to maintain neural stem cell identity, revealing context-dependent activator and repressor functions.","evidence":"ChIP, Co-IP, siRNA rescue, xenograft models; luciferase reporter and ChIP for HMGB3 promoter; RNA-seq, ATAC-seq, and in vivo NSC overexpression/knockdown (preprint for NSC study)","pmids":["39781447","41716633","bio_10.1101_2025.02.13.635953"],"confidence":"Medium","gaps":["Neural stem cell study is a preprint awaiting peer review","How TGIF2 switches between transcriptional repression and activation is mechanistically unresolved","In vivo requirement for TGIF2 in adult neural stem cell niches not demonstrated"]},{"year":null,"claim":"Key unresolved questions include the structural basis of TGIF2's dual repressor/activator function, the identity of the E3 ubiquitin ligase controlling its turnover, and genome-wide maps of direct TGIF2 binding sites across developmental and disease contexts.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No crystal or cryo-EM structure of TGIF2 or its complexes","No genome-wide TGIF2 ChIP-seq in normal developmental tissues","E3 ligase for TGIF2 ubiquitination unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,6,8,9,13,16,17]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,5,6,9,13,14,16,17]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,8,17]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,8,9,12,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,4,5,7]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,2,9,14]}],"complexes":["SIN3A/HDAC corepressor complex","JICD1–DDX17–SMAD3–TGIF2 complex"],"partners":["HDAC1","SIN3A","SMAD2","SMAD3","DDX17","JICD1","PKM2"],"other_free_text":[]},"mechanistic_narrative":"TGIF2 is a TALE-superclass homeodomain transcriptional repressor that controls cell fate decisions in development and disease by recruiting histone deacetylase complexes to target gene promoters and by modulating TGF-β/Nodal–Smad signaling. TGIF2 represses transcription through direct recruitment of HDAC1 and the mSin3/SIN3A corepressor complex, and unlike the related TGIF1, it does not interact with CtBP, functioning as a context-independent repressor of both TGF-β-dependent and -independent targets [PMID:11427533, PMID:16436215]. EGFR/RAS/ERK-mediated phosphorylation stabilizes TGIF2 protein and is required for its ability to recruit HDAC1 to promoters such as E-cadherin, thereby driving EMT and cancer stemness, while TGIF2 also participates in multiprotein transcriptional complexes (e.g., JICD1–DDX17–SMAD3–TGIF2) that activate SOX2 expression [PMID:31871777, PMID:36647029, PMID:36417870]. In vivo, Tgif2 functions redundantly with Tgif1 to limit Nodal signaling during gastrulation and axial patterning, and independently directs lineage decisions including pancreas-liver fate specification, photoreceptor differentiation, and neural stem cell maintenance [PMID:20040491, PMID:28193997, PMID:27639517]."},"prefetch_data":{"uniprot":{"accession":"Q9GZN2","full_name":"Homeobox protein TGIF2","aliases":["5'-TG-3'-interacting factor 2","TGF-beta-induced transcription factor 2","TGFB-induced factor 2"],"length_aa":237,"mass_kda":25.9,"function":"Transcriptional repressor, which probably repress transcription by binding directly the 5'-CTGTCAA-3' DNA sequence or by interacting with TGF-beta activated SMAD proteins. Probably represses transcription via the recruitment of histone deacetylase proteins","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9GZN2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TGIF2","classification":"Not Classified","n_dependent_lines":24,"n_total_lines":1208,"dependency_fraction":0.019867549668874173},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TGIF2","total_profiled":1310},"omim":[{"mim_id":"611172","title":"MICRO RNA 34A; MIR34A","url":"https://www.omim.org/entry/611172"},{"mim_id":"607294","title":"TRANSFORMING GROWTH FACTOR-BETA-INDUCED FACTOR 2; TGIF2","url":"https://www.omim.org/entry/607294"},{"mim_id":"602630","title":"TRANSFORMING GROWTH FACTOR-BETA-INDUCED FACTOR 1; TGIF1","url":"https://www.omim.org/entry/602630"},{"mim_id":"300411","title":"TRANSFORMING GROWTH FACTOR-BETA-INDUCED FACTOR 2-LIKE, X-LINKED; TGIF2LX","url":"https://www.omim.org/entry/300411"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Centrosome","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TGIF2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9GZN2","domains":[{"cath_id":"1.10.10.60","chopping":"26-89","consensus_level":"high","plddt":96.7022,"start":26,"end":89}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZN2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZN2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZN2-F1-predicted_aligned_error_v6.png","plddt_mean":68.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TGIF2","jax_strain_url":"https://www.jax.org/strain/search?query=TGIF2"},"sequence":{"accession":"Q9GZN2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9GZN2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9GZN2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZN2"}},"corpus_meta":[{"pmid":"11427533","id":"PMC_11427533","title":"TGIF2 interacts with histone deacetylase 1 and represses transcription.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11427533","citation_count":116,"is_preprint":false},{"pmid":"11006116","id":"PMC_11006116","title":"Amplification and overexpression of TGIF2, a novel homeobox gene of the TALE superclass, in ovarian cancer cell lines.","date":"2000","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/11006116","citation_count":91,"is_preprint":false},{"pmid":"20040491","id":"PMC_20040491","title":"Tgif1 and Tgif2 regulate Nodal signaling and are required for gastrulation.","date":"2010","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/20040491","citation_count":55,"is_preprint":false},{"pmid":"31871777","id":"PMC_31871777","title":"TGIF2 promotes the progression of lung adenocarcinoma by bridging EGFR/RAS/ERK signaling to cancer cell stemness.","date":"2019","source":"Signal transduction and 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regulating miR-449a/TGIF2 axis.","date":"2019","source":"Thoracic cancer","url":"https://pubmed.ncbi.nlm.nih.gov/31793741","citation_count":22,"is_preprint":false},{"pmid":"28454497","id":"PMC_28454497","title":"MicroRNA-34a alleviates steroid-induced avascular necrosis of femoral head by targeting Tgif2 through OPG/RANK/RANKL signaling pathway.","date":"2017","source":"Experimental biology and medicine (Maywood, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/28454497","citation_count":19,"is_preprint":false},{"pmid":"32541687","id":"PMC_32541687","title":"microRNA-181c-5p promotes the formation of insulin-producing cells from human induced pluripotent stem cells by targeting smad7 and TGIF2.","date":"2020","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/32541687","citation_count":19,"is_preprint":false},{"pmid":"32495888","id":"PMC_32495888","title":"Sevoflurane impedes the progression of glioma through modulating the circular RNA has_circ_0012129/miR-761/TGIF2 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through Tgif2 by acting as a ceRNA of miR-590-3p in a murine model.","date":"2021","source":"Regenerative medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34187170","citation_count":7,"is_preprint":false},{"pmid":"39781447","id":"PMC_39781447","title":"Smad2 Cooperating with TGIF2 Contributes to EMT and Cancer Stem Cells Properties in Pancreatic Cancer via Co-Targeting SOX2.","date":"2025","source":"International journal of biological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39781447","citation_count":6,"is_preprint":false},{"pmid":"34471941","id":"PMC_34471941","title":"Circular RNA circMMP1 Contributes to the Progression of Glioma Through Regulating TGIF2 Expression by Sponging miR-195-5p.","date":"2021","source":"Biochemical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34471941","citation_count":4,"is_preprint":false},{"pmid":"27639517","id":"PMC_27639517","title":"Role of transcription factor Tgif2 in photoreceptor differentiation in the mouse retina.","date":"2016","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/27639517","citation_count":3,"is_preprint":false},{"pmid":"40168772","id":"PMC_40168772","title":"FBLN2 inhibits gastric cancer proliferation and metastasis via the TGFβ/TGIF2 pathway.","date":"2025","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/40168772","citation_count":1,"is_preprint":false},{"pmid":"41716633","id":"PMC_41716633","title":"TGIF2-mediated HMGB3 overexpression promotes esophageal squamous cell carcinoma proliferation and metastasis through TLR3/TGF-β signaling.","date":"2025","source":"Genes & diseases","url":"https://pubmed.ncbi.nlm.nih.gov/41716633","citation_count":0,"is_preprint":false},{"pmid":"39530347","id":"PMC_39530347","title":"RETRACTION: MiR-129-5p Inhibits Glioma Cell Progression In Vitro and In Vivo by Targeting TGIF2.","date":"2024","source":"Journal of cellular and molecular 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priming","date":"2025-02-14","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.13.635953","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":21898,"output_tokens":3956,"usd":0.062517},"stage2":{"model":"claude-opus-4-6","input_tokens":7435,"output_tokens":3287,"usd":0.179025},"total_usd":0.241542,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"TGIF2 represses transcription by recruiting histone deacetylase (HDAC1) and interacting with TGF-β-activated Smads; unlike TGIF1, TGIF2 cannot interact with the corepressor CtBP, making it a context-independent repressor.\",\n      \"method\": \"Co-immunoprecipitation, transcriptional reporter assays, DNA-binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and functional reporter assays with multiple mechanistic readouts in a highly-cited study\",\n      \"pmids\": [\"11427533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TGIF2 is a TALE-superclass homeodomain protein that localizes to the nucleus via a putative nuclear localization signal, confirmed by transfection of epitope-tagged cDNA.\",\n      \"method\": \"Epitope-tagged cDNA transfection and nuclear localization assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single localization experiment with functional implication but limited mechanistic follow-up\",\n      \"pmids\": [\"11006116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TGIF2 interacts with the transcriptional corepressor mSin3; both full-length and alternatively spliced short forms of mouse Tgif2 function as active transcriptional repressors capable of repressing TGF-β-dependent and -independent transcription.\",\n      \"method\": \"Co-immunoprecipitation, transcriptional reporter assays, RT-PCR splice variant characterization\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional reporter assays, single lab\",\n      \"pmids\": [\"16436215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tgif1 and Tgif2 function redundantly as transcriptional co-repressors that limit Nodal signaling; double loss-of-function causes gastrulation failure and left-right asymmetry defects, and genetic reduction of Nodal dosage partially rescues these phenotypes, placing Tgifs as negative regulators upstream of Nodal transcriptional response.\",\n      \"method\": \"Genetic epistasis (compound null mouse mutants, conditional epiblast deletion, Nodal dose reduction rescue)\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — rigorous genetic epistasis with multiple conditional alleles and dose-response rescue, replicated across conditions\",\n      \"pmids\": [\"20040491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tgif1 and Tgif2 regulate axial patterning; loss of Tgif1 causes posterior vertebral transformation with altered Hoxc6 expression, and combined Tgif1/Tgif2 mutations increase severity, demonstrating functional redundancy in retinoic-acid-mediated Hox regulation.\",\n      \"method\": \"Loss-of-function mouse genetics (single and compound null mutants), retinoic acid exposure, Hoxc6 expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean in vivo genetic analysis with defined phenotypic readout, single lab\",\n      \"pmids\": [\"27187787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TGIF2 acts as a developmental regulator of the pancreas-versus-liver fate decision; forced expression of Tgif2 in hepatocytes represses hepatic identity genes and induces a pancreatic progenitor-like transcriptional program both ex vivo and in vivo, demonstrating its sufficiency for lineage reprogramming.\",\n      \"method\": \"In vivo adeno-associated viral overexpression in mouse hepatocytes, ex vivo hepatocyte culture, transcriptome profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vivo and ex vivo experiments with transcriptome-level validation\",\n      \"pmids\": [\"28193997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TGIF1 binds to a conserved TGIF consensus site 5' of the Evi5l gene and represses its expression; loss of Tgif1 and Tgif2 increases Evi5l expression, decreases primary cilia number, and reduces Shh pathway transcriptional response in MEFs; knockdown of Evi5l partially restores cilia and Shh signaling in double-null MEFs.\",\n      \"method\": \"ChIP, transcriptome profiling, siRNA knockdown, primary cilia quantification, Shh pathway reporter assays in MEFs\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus genetic epistasis with functional rescue, multiple orthogonal methods\",\n      \"pmids\": [\"27956704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tgif2 participates in photoreceptor cell differentiation in the early mouse retina; shRNA knockdown decreases rod photoreceptors and increases cones, while conditional Tgif2 overexpression causes abnormal nuclear localization of cone photoreceptors.\",\n      \"method\": \"shRNA knockdown in retinal explants, conditional knock-in mouse, ERG functional testing\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and ex vivo loss- and gain-of-function with defined cellular phenotype, single lab\",\n      \"pmids\": [\"27639517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EGFR-RAS-ERK signaling phosphorylates TGIF2 and increases its protein stability; phosphorylation is required for TGIF2-promoted cancer stem cell properties and OCT4 promoter binding, as phosphorylation-deficient TGIF2 mutants lose these functions.\",\n      \"method\": \"Phosphorylation-deficient mutagenesis, luciferase/ChIP reporter assays, xenograft mouse models\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — site-directed mutagenesis combined with ChIP and in vivo xenograft validation\",\n      \"pmids\": [\"31871777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Phosphorylation of TGIF2 by EGFR/ERK signaling is required for TGIF2 to recruit HDAC1 to the E-cadherin promoter and suppress E-cadherin transcription, thereby promoting EMT and metastasis in lung adenocarcinoma; phosphorylation-deficient TGIF2 mutants cannot recruit HDAC1 or suppress E-cadherin.\",\n      \"method\": \"Co-immunoprecipitation (TGIF2-HDAC1 interaction), ChIP, dual-luciferase reporter, phosphorylation-deficient mutagenesis, xenograft mouse models\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reciprocal Co-IP plus ChIP, mutagenesis, and in vivo validation in single study\",\n      \"pmids\": [\"36647029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Nuclear PKM2 promotes post-translational degradation of TGIF2 protein via the ubiquitin-proteasome system during EMT in oral squamous cell carcinoma; TGIF2 mRNA and protein levels dissociate, and proteasome inhibition with MG132 restores TGIF2 protein.\",\n      \"method\": \"MG132 proteasome inhibition assay, Western blot, PKM2 knockdown, mRNA/protein expression mismatch analysis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological proteasome inhibition plus knockdown with defined mechanistic readout, single lab\",\n      \"pmids\": [\"30333907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"JICD1 (Jagged1 intracellular domain) forms a transcriptional complex with DDX17, SMAD3, and TGIF2 to increase SOX2 expression, driving oncogenic transformation; TGIF2 is thus a component of a transcriptional complex promoting cancer stem cell properties.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, proteomics, transcriptome analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP supported by ChIP-seq and proteomics, multiple orthogonal methods\",\n      \"pmids\": [\"36417870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TGIF2 is an endogenous repressor of TGF-β/Smad2/3 signaling; miR-181c-5p targets the 3'UTR of TGIF2 mRNA, reduces TGIF2 protein, and elevates Smad2/3 phosphorylation to promote pancreatic progenitor differentiation from hiPSCs.\",\n      \"method\": \"Luciferase 3'UTR reporter assay, Western blot, Smad2/3 phosphorylation assay, lentiviral overexpression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — 3'UTR validation plus signaling pathway readout, single lab\",\n      \"pmids\": [\"32541687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TGIF2 represses FCMR transcription by directly binding to the FCMR gene promoter in cervical cancer cells, and TGIF2-driven metastasis is partially dependent on this FCMR suppression.\",\n      \"method\": \"Luciferase promoter assay, shRNA knockdown, in vivo nude mouse metastasis model\",\n      \"journal\": \"European review for medical and pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — luciferase promoter assay with in vivo confirmation, single lab\",\n      \"pmids\": [\"32572908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TGIF2 controls neural stem cell (NSC) fate maintenance by interacting with the SIN3A/HDAC repressor complex to suppress neuronal differentiation genes; loss or gain of TGIF2 in cortical NSCs shifts the balance between self-renewal and neuronal differentiation.\",\n      \"method\": \"RNA-seq, ATAC-seq, in vitro and in vivo overexpression/knockdown, co-immunoprecipitation with SIN3A/HDAC complex\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiomic plus functional in vivo experiments, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.02.13.635953\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TGIF2 downregulation in autistic mice is associated with inactivation of the Wnt/β-catenin signaling pathway; overexpression of TGIF2 suppresses neuronal apoptosis and autism-like symptoms. The histone demethylase LSD1 binds the TGIF2 promoter and is associated with H3K4me1 reduction and TGIF2 downregulation.\",\n      \"method\": \"ChIP-qPCR, adenovirus-mediated overexpression in vivo, behavioral tests, pathway analysis\",\n      \"journal\": \"Brain and behavior\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ChIP-qPCR plus in vivo rescue, single lab with moderate mechanistic depth\",\n      \"pmids\": [\"35592894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TGIF2 transcriptionally upregulates HMGB3 by binding the HMGB3 promoter (confirmed by luciferase reporter and ChIP assays); HMGB3 then promotes TGF-β signaling through TLR3, driving esophageal squamous cell carcinoma proliferation and metastasis.\",\n      \"method\": \"Luciferase reporter assay, ChIP, co-immunoprecipitation, RNA-seq\",\n      \"journal\": \"Genes & diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and luciferase reporter validation of direct promoter binding, single lab\",\n      \"pmids\": [\"41716633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Smad2 cooperates with TGIF2 to co-regulate the SOX2 promoter, activating SOX2 expression; SOX2 in turn transactivates EGFR/MAPK signaling that promotes TGIF2 nuclear translocation, forming a positive feedback loop driving EMT and cancer stem cell properties in pancreatic cancer.\",\n      \"method\": \"ChIP, co-immunoprecipitation, siRNA rescue experiments, luciferase reporter, in vivo xenograft\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus Co-IP and functional rescue, single lab\",\n      \"pmids\": [\"39781447\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TGIF2 is a TALE-homeodomain transcriptional repressor that acts by recruiting HDAC1 and the mSin3 corepressor complex (but not CtBP) to limit TGF-β/Nodal–Smad signaling and directly repress target gene promoters; its repressive activity and stability are enhanced by EGFR/ERK-mediated phosphorylation, and it participates in broader transcriptional complexes (e.g., with SMAD3/DDX17/JICD1) to regulate cell fate decisions including gastrulation, neural stem cell maintenance, pancreas-liver lineage choice, and cancer stemness.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TGIF2 is a TALE-superclass homeodomain transcriptional repressor that controls cell fate decisions in development and disease by recruiting histone deacetylase complexes to target gene promoters and by modulating TGF-β/Nodal–Smad signaling. TGIF2 represses transcription through direct recruitment of HDAC1 and the mSin3/SIN3A corepressor complex, and unlike the related TGIF1, it does not interact with CtBP, functioning as a context-independent repressor of both TGF-β-dependent and -independent targets [PMID:11427533, PMID:16436215]. EGFR/RAS/ERK-mediated phosphorylation stabilizes TGIF2 protein and is required for its ability to recruit HDAC1 to promoters such as E-cadherin, thereby driving EMT and cancer stemness, while TGIF2 also participates in multiprotein transcriptional complexes (e.g., JICD1–DDX17–SMAD3–TGIF2) that activate SOX2 expression [PMID:31871777, PMID:36647029, PMID:36417870]. In vivo, Tgif2 functions redundantly with Tgif1 to limit Nodal signaling during gastrulation and axial patterning, and independently directs lineage decisions including pancreas-liver fate specification, photoreceptor differentiation, and neural stem cell maintenance [PMID:20040491, PMID:28193997, PMID:27639517].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing TGIF2 as a nuclear TALE-homeodomain protein resolved the basic subcellular context in which it operates.\",\n      \"evidence\": \"Epitope-tagged cDNA transfection with nuclear localization assay in mammalian cells\",\n      \"pmids\": [\"11006116\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No DNA-binding specificity or target genes identified at this stage\",\n        \"Functional role beyond nuclear localization uncharacterized\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that TGIF2 recruits HDAC1 and interacts with TGF-β-activated Smads — but unlike TGIF1 cannot bind CtBP — established it as a context-independent transcriptional repressor that attenuates Smad signaling.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, transcriptional reporter assays, and DNA-binding assays\",\n      \"pmids\": [\"11427533\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Endogenous chromatin targets not identified\",\n        \"In vivo requirement not tested\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of mSin3 as an additional corepressor partner and characterization of splice variants showed that TGIF2 represses both TGF-β-dependent and -independent transcription through multiple corepressor complexes.\",\n      \"evidence\": \"Co-immunoprecipitation and transcriptional reporter assays with full-length and short splice forms of mouse Tgif2\",\n      \"pmids\": [\"16436215\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Relative contribution of HDAC1 vs. mSin3 recruitment not dissected\",\n        \"No in vivo confirmation of splice-variant-specific functions\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic epistasis in compound-null mice proved that Tgif1 and Tgif2 redundantly limit Nodal signaling in vivo, as their combined loss caused gastrulation failure rescuable by reducing Nodal dosage.\",\n      \"evidence\": \"Compound null and conditional epiblast-deleted mouse mutants with Nodal dose-reduction rescue\",\n      \"pmids\": [\"20040491\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct chromatin targets mediating Nodal repression not mapped\",\n        \"Individual contribution of TGIF2 vs. TGIF1 in this context remains unclear\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extending the developmental scope, loss-of-function studies showed TGIF2 contributes redundantly with TGIF1 to axial patterning via Hox gene regulation, and independently regulates photoreceptor rod vs. cone fate in the retina.\",\n      \"evidence\": \"Single and compound null mouse mutants with Hoxc6 expression analysis; shRNA knockdown and conditional overexpression in retinal explants\",\n      \"pmids\": [\"27187787\", \"27639517\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct promoter binding at Hox loci not demonstrated\",\n        \"Mechanism linking TGIF2 to rod/cone specification unknown\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Three studies collectively broadened TGIF2's role: forced expression in hepatocytes induced a pancreatic progenitor-like program, loss of Tgif1/2 derepressed Evi5l to reduce primary cilia and Shh signaling, and TGIF2 was found to directly bind and repress the FCMR promoter to promote metastasis.\",\n      \"evidence\": \"AAV-mediated Tgif2 overexpression in mouse hepatocytes with transcriptome profiling; ChIP, siRNA rescue, and cilia quantification in MEFs; luciferase promoter assay and nude mouse metastasis model\",\n      \"pmids\": [\"28193997\", \"27956704\", \"32572908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Endogenous requirement for TGIF2 in pancreas specification not tested (gain-of-function only)\",\n        \"Whether TGIF2 directly binds Evi5l promoter (ChIP was for TGIF1)\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showing that nuclear PKM2 targets TGIF2 for ubiquitin-proteasome-dependent degradation revealed a post-translational control mechanism governing TGIF2 protein levels.\",\n      \"evidence\": \"MG132 proteasome inhibition, PKM2 knockdown, mRNA/protein discordance analysis in oral squamous cell carcinoma\",\n      \"pmids\": [\"30333907\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"E3 ligase mediating TGIF2 ubiquitination not identified\",\n        \"Direct PKM2–TGIF2 physical interaction not shown\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"EGFR/RAS/ERK-mediated phosphorylation was shown to stabilize TGIF2 protein and be required for OCT4 promoter binding and cancer stem cell properties, linking upstream signaling to TGIF2 transcriptional activity.\",\n      \"evidence\": \"Phosphorylation-deficient mutagenesis, ChIP, luciferase reporter assays, and xenograft mouse models\",\n      \"pmids\": [\"31871777\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific phosphorylation sites and their individual contributions not fully mapped\",\n        \"Whether phosphorylation controls all TGIF2 targets or a subset is unknown\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Two studies expanded TGIF2's transcriptional partnerships: it was identified as a component of a JICD1–DDX17–SMAD3–TGIF2 complex that activates SOX2 to drive cancer stemness, and separately, LSD1-mediated epigenetic silencing of the TGIF2 promoter was linked to neuronal apoptosis in an autism model.\",\n      \"evidence\": \"Co-IP, ChIP-seq, and proteomics for the JICD1 complex; ChIP-qPCR and adenoviral overexpression with behavioral testing in mice\",\n      \"pmids\": [\"36417870\", \"35592894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether TGIF2 acts as repressor or activator in the JICD1 complex is ambiguous\",\n        \"Causal role of TGIF2 downregulation in autism pathogenesis not established\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"ERK-dependent phosphorylation was mechanistically linked to HDAC1 recruitment at the E-cadherin promoter, showing that phosphorylation controls the repressor–corepressor interaction driving EMT.\",\n      \"evidence\": \"Reciprocal Co-IP of TGIF2–HDAC1, ChIP on E-cadherin promoter, phosphorylation-deficient mutants, and xenograft models in lung adenocarcinoma\",\n      \"pmids\": [\"36647029\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of phosphorylation-dependent HDAC1 recruitment unknown\",\n        \"Genome-wide scope of phospho-TGIF2-dependent repression not determined\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Recent work identified a TGIF2–Smad2–SOX2–EGFR positive feedback loop in pancreatic cancer, TGIF2 transcriptional activation of HMGB3 in esophageal cancer, and TGIF2 interaction with SIN3A/HDAC to maintain neural stem cell identity, revealing context-dependent activator and repressor functions.\",\n      \"evidence\": \"ChIP, Co-IP, siRNA rescue, xenograft models; luciferase reporter and ChIP for HMGB3 promoter; RNA-seq, ATAC-seq, and in vivo NSC overexpression/knockdown (preprint for NSC study)\",\n      \"pmids\": [\"39781447\", \"41716633\", \"bio_10.1101_2025.02.13.635953\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Neural stem cell study is a preprint awaiting peer review\",\n        \"How TGIF2 switches between transcriptional repression and activation is mechanistically unresolved\",\n        \"In vivo requirement for TGIF2 in adult neural stem cell niches not demonstrated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of TGIF2's dual repressor/activator function, the identity of the E3 ubiquitin ligase controlling its turnover, and genome-wide maps of direct TGIF2 binding sites across developmental and disease contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of TGIF2 or its complexes\",\n        \"No genome-wide TGIF2 ChIP-seq in normal developmental tissues\",\n        \"E3 ligase for TGIF2 ubiquitination unidentified\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 6, 8, 9, 13, 16, 17]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 5, 6, 9, 13, 14, 16, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 8, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0074160\", \"supporting_discovery_ids\": [0, 2, 5, 6, 9, 13, 14, 16, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 8, 9, 12, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 4, 5, 7]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 2, 9, 14]}\n    ],\n    \"complexes\": [\n      \"SIN3A/HDAC corepressor complex\",\n      \"JICD1–DDX17–SMAD3–TGIF2 complex\"\n    ],\n    \"partners\": [\n      \"HDAC1\",\n      \"SIN3A\",\n      \"SMAD2\",\n      \"SMAD3\",\n      \"DDX17\",\n      \"JICD1\",\n      \"PKM2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}