{"gene":"GABPA","run_date":"2026-06-09T23:54:44","timeline":{"discoveries":[{"year":2018,"finding":"GABPA directly activates DICER1 transcription by binding to the DICER1 promoter; mutation of the GABPA binding site in the DICER1 promoter diminished basal DICER1 promoter activity and abolished GABPA-stimulated promoter activity. GABPA depletion reduced DICER1 expression and increased cellular invasion in thyroid carcinoma cells, while forced DICER1 expression rescued the invasive phenotype of GABPA-depleted cells.","method":"siRNA knockdown, GABPA binding site mutagenesis in promoter-reporter assay, forced DICER1 re-expression rescue experiment, correlation analysis in patient samples","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — promoter mutagenesis, rescue experiment, and replication across patient cohorts and TCGA dataset in one study","pmids":["30181547"],"is_preprint":false},{"year":2020,"finding":"GABPA binds to the DICER1 promoter and regulates DICER1 expression in follicular thyroid carcinoma (FTC) cells; GABPA depletion reduced DICER1 expression, stimulated cell proliferation, and altered miRNA expression, confirming a direct transcriptional regulatory link.","method":"ChIP assay, siRNA knockdown of GABPA in FTC cell lines, miRNA expression profiling","journal":"Endocrine-related cancer","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus functional KD phenotype, independently replicating the GABPA–DICER1 axis from PMID:30181547","pmids":["32163919"],"is_preprint":false},{"year":2019,"finding":"GABPA directly activates transcription of FoxA1 and GATA3, key transcription factors driving luminal differentiation of urothelial cells, thereby dictating luminal identity in bladder cancer cells and suppressing aggressive/basal phenotypes, stemness, invasiveness, and cisplatin resistance.","method":"siRNA/shRNA knockdown and overexpression of GABPA, ChIP-based identification of FoxA1 and GATA3 as direct targets, xenograft transplant model for in vivo metastasis, TCGA/GEO dataset analyses","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP for direct target identification, in vivo xenograft model, multiple orthogonal functional assays in one study","pmids":["31802036"],"is_preprint":false},{"year":2022,"finding":"GABPA directly activates TGFBR2 transcription (identified by RNA-seq and ChIP); GABPA and TGFBR2 phenocopy each other in clear cell renal cell carcinoma (ccRCC) cells, governing TGFβ signaling to suppress proliferation, invasion, and stemness. The oncometabolite L-2-hydroxyglutarate (L-2HG) silences GABPA expression by increasing GABPA gene methylation, thereby disrupting the GABPA–TGFβ axis.","method":"RNA sequencing, ChIP assay, siRNA knockdown and overexpression, xenograft mouse model, L-2HG treatment with methylation analysis, immunohistochemistry on patient specimens","journal":"Journal of experimental & clinical cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNA-seq + ChIP for target identification, in vivo xenograft, epigenetic mechanism, multiple orthogonal methods in one study","pmids":["35549739"],"is_preprint":false},{"year":2021,"finding":"GABPA mediates regulation of BRAFV600E/MAPK signaling on TERT reactivation by selectively recruiting activated ERK to the mutant TERT promoter, where ERK phosphorylates Sp1, causing HDAC1 dissociation and active chromatin. Phosphorylated Sp1 further enhances GABPA binding to the mutant TERT promoter, establishing a synergistic activation loop.","method":"Reporter assays, ChIP assays, co-immunoprecipitation, overexpression/knockdown, phosphorylation analysis","journal":"NPJ precision oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and co-IP evidence from a single lab, multiple complementary assays but no independent replication","pmids":["33483600"],"is_preprint":false},{"year":2014,"finding":"METTL23 physically interacts with GABPA (co-immunoprecipitation). Overexpression of METTL23 increased transcriptional activity at the THPO promoter (a GABPA target), while siRNA knockdown of METTL23 decreased expression of ATP5B (another GABPA target), establishing METTL23 as a co-regulator of GABPA transcriptional function.","method":"Co-immunoprecipitation, promoter-reporter assay for THPO, siRNA knockdown of METTL23 with qRT-PCR for ATP5B","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal functional assays (overexpression + knockdown) plus Co-IP from a single lab","pmids":["24501276"],"is_preprint":false},{"year":2012,"finding":"GABPA controls cell migration in MCF10A breast epithelial cells by regulating a gene network distinct from that of ELK1. Direct GABPA targets RAC1 and KIF20A were identified as functionally important for this migration control.","method":"Chromatin immunoprecipitation-sequencing, gene knockdown, cell migration assays in breast epithelial cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq for direct target identification combined with functional KD migration assays, single lab","pmids":["23284628"],"is_preprint":false},{"year":2015,"finding":"CAPER coactivates ERR-α-mediated Gabpa transcription in response to nutrient (glucose) signaling, linking nutrient-induced mitochondrial energy metabolism to GABPA expression. Inhibition of CAPER arrests ATP generation and GABPA-dependent mitochondrial transcriptional programs.","method":"Coactivation assays, siRNA inhibition of CAPER, metabolic measurements (ATP, respiration), transcriptome analysis","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional coactivation assay and metabolic phenotyping in a single study, single lab","pmids":["25830341"],"is_preprint":false},{"year":2017,"finding":"The GABPA cistrome in THP-1 monocytes (3822 loci) overlaps significantly with VDR binding sites; ~23% of persistent VDR binding sites co-localize with GABPA. About 40% of GABPA binding sites are at transcription start sites, including ~100 of 1,25(OH)2D3 target genes, indicating GABPA contributes to differential vitamin D receptor target gene regulation.","method":"ChIP-sequencing of GABPA and VDR cistromes in THP-1 monocytes, bioinformatic co-localization analysis with PU.1","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq genome-wide binding data, single lab, no functional rescue","pmids":["28870774"],"is_preprint":false},{"year":2016,"finding":"GABPA binds to human-specific promoter sequences to regulate transcription of ~1,215 candidate primary target genes; substitutions creating or disrupting GABPA consensus binding sequences functionally alter promoter activity both in human and nonhuman primate cell backgrounds, demonstrated by promoter-reporter assays and GABPA knockdown.","method":"ChIP-sequencing, promoter-reporter assays in human and African green monkey cells, GABPA knockdown followed by expression profiling","journal":"Molecular biology and evolution","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus functional promoter mutagenesis assays, single lab","pmids":["26814189"],"is_preprint":false},{"year":2019,"finding":"GABPA remains bound to specific genomic sites during mitosis and cooperates with histone acetylation marks (H3K9/14Ac, H3K27Ac, H4K5Ac) to act as a mitotic bookmarking factor. Depletion of GABPA increases H4K5Ac levels at target gene regions and induces transcriptional activation in early G1, suggesting GABPA negatively regulates transcription during the M/G1 transition.","method":"ChIP in mitotic cells, GABPA depletion with histone modification analysis, transcription assays at M/G1 transition","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP in synchronized cells plus functional depletion with histone and transcriptional readouts, single lab","pmids":["30836589"],"is_preprint":false},{"year":2014,"finding":"Gain-of-function mutant p53 (R273H) co-localizes genomically with GABPA binding sites at bidirectional promoters enriched for closely spaced ETS motifs. GABPA shows increased binding signal with higher numbers of ETS motifs per promoter and prefers promoters with closely spaced inverted ETS motifs, in contrast to ETS1.","method":"ChIP-seq for p53 R273H, ETS1, and GABPA; bioinformatic analysis of ETS motif spacing and binding signal","journal":"Oncotarget","confidence":"Low","confidence_rationale":"Tier 4 / Weak — ChIP-seq binding analysis only, no functional validation of the interaction mechanism","pmids":["24481480"],"is_preprint":false},{"year":2022,"finding":"GABPA binds directly to the RACGAP1 promoter and regulates its transcription in hepatocellular carcinoma, as confirmed by luciferase reporter and ChIP assays.","method":"Luciferase reporter assay, ChIP assay","journal":"Oxidative medicine and cellular longevity","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, ChIP and reporter assay without independent replication or mutagenesis","pmids":["35958019"],"is_preprint":false},{"year":2022,"finding":"GABPA negatively regulates GPX1 transcription in gastric cancer cells; GABPA binds GPX1 via a predicted site confirmed by dual-luciferase reporter assay, and overexpression of GABPA reduces GPX1 levels and blocks cell migration.","method":"Dual-luciferase reporter assay, GABPA overexpression, transwell and wound healing migration assays","journal":"Journal of medical biochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, luciferase reporter assay only, no ChIP or mutagenesis","pmids":["36042907"],"is_preprint":false},{"year":2023,"finding":"GABPA binds directly to the PHB2 promoter region and controls transcriptional expression of PHB2 in endometriosis. PHB2 downregulation in ectopic endometrium leads to impaired PRKN/Parkin-mediated mitophagy, promoting cell proliferation, migration, and invasion.","method":"Bioinformatics, ChIP assay, reporter assay for GABPA-PHB2 promoter interaction, PHB2 overexpression/knockdown with mitophagy marker analysis","journal":"Reproductive sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ChIP and reporter assay from single lab with limited mechanistic depth on GABPA itself","pmids":["37587393"],"is_preprint":false},{"year":2024,"finding":"GABPA directly binds to the ACSL4 promoter region and promotes ACSL4 transcription, increasing susceptibility of clear cell renal cell carcinoma cells to ferroptosis; GABPA overexpression suppressed ccRCC cell proliferation, migration, and invasion through this pathway.","method":"ChIP assay, GABPA overexpression in vitro and in vivo, ferroptosis assays","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, ChIP plus overexpression phenotype, limited mechanistic depth","pmids":["39489850"],"is_preprint":false},{"year":2024,"finding":"GABPA functions as a transcription factor for HPN-AS1 (a lncRNA) by binding its promoter, as confirmed by ChIP and luciferase reporter assays in hepatocellular carcinoma cells.","method":"ChIP assay, luciferase reporter assay","journal":"The Turkish journal of gastroenterology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, ChIP and reporter assay without mutagenesis or independent replication","pmids":["39114737"],"is_preprint":false},{"year":2025,"finding":"GABPA induces miR-30e expression by stimulating DICER1 transcription; higher miR-30e levels consequently target P4HA2 for downregulation. This GABPA→DICER1→miR-30e→P4HA2 axis reduces collagen I and III formation (ECM deposition), lowers ECM stiffness, suppresses YAP1 nuclear translocation (mechanotransduction), and restrains bladder cancer aggressiveness in xenograft models.","method":"GABPA-transgenic mice, GABPA overexpression/depletion in BC cells, atomic force microscopy of ECM rigidity, xenograft metastasis model, miR-30e manipulation, P4HA2 overexpression rescue","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods including transgenic mice, atomic force microscopy, and in vivo xenograft, single lab","pmids":["40813762"],"is_preprint":false},{"year":2025,"finding":"GABPA regulates ASC transcription (confirmed by luciferase reporter and ChIP assays); HMGB1 activates caspase-1 through this GABPA-regulated ASC transcription in hepatic stellate cells, promoting liver fibrosis.","method":"Luciferase reporter assay, ChIP assay, immunofluorescence, immunoblotting, lentiviral transfection, caspase-1 inhibitor (Z-YVAD-FMK) treatment","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, ChIP and reporter assay, no independent replication","pmids":["40749747"],"is_preprint":false},{"year":2025,"finding":"GABPA is required for T-lineage entry in early T cell development; acute CRISPR knockout of Gabpa blocks T-lineage developmental progression in an in vitro differentiation system derived from expanded hematopoietic progenitors.","method":"Acute CRISPR knockout of Gabpa in hematopoietic progenitor expansion + T cell differentiation culture system, single-cell RNA sequencing","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, KO phenotype without downstream mechanistic pathway placement for GABPA specifically","pmids":["bio_10.1101_2025.04.22.649893"],"is_preprint":true},{"year":2025,"finding":"GABPA is required for naive pluripotency establishment; using a targeted rapid protein degradation system, GABPA depletion disrupted major zygotic genome activation (ZGA) and epiblast (EPI) specification during E3.5–E4.5 transition, affecting 47% of EPI genes. GABPA binding dynamics show it occupies ICM gene promoters co-bound by TFAP2C and SOX2 at E3.5 to drive the EPI program at E4.5.","method":"Targeted rapid protein degradation (auxin-inducible degron system), chromatin binding dynamics analysis (ChIP/ATAC), single-cell transcriptomics","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — protein degradation system with chromatin binding dynamics and transcriptomic readouts, single lab, peer-reviewed","pmids":["39747581"],"is_preprint":false},{"year":2024,"finding":"miR-450b-5p directly targets GABPA (reducing its expression), and GABPA in turn binds directly to the HOXD10 promoter to regulate HOXD10 transcription. Knockdown of GABPA promoted proliferation and invasion of endometriotic cells in vivo and in vitro, phenocopying miR-450b-5p overexpression.","method":"miRNA target validation, GABPA knockdown/overexpression, promoter binding assay for HOXD10, in vivo mouse endometriosis model with lentiviral HOXD10 overexpression","journal":"iScience","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, promoter binding assay without ChIP; mechanistic depth for GABPA limited to regulatory axis identification","pmids":["39759007"],"is_preprint":false},{"year":1995,"finding":"The GABPA (E4TF1-60) gene was mapped to human chromosome 21q21.2-q21.3 and shown to contain ten exons. GABPA is an ETS-related DNA-binding protein that forms heterodimers with other polypeptides.","method":"Genomic Southern hybridization, exon sequencing, FISH (independently confirmed by FISH, somatic cell hybrids, YAC hybridization in PMID:7590737)","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Strong — independently replicated chromosomal mapping by two labs using orthogonal methods","pmids":["8543189","7590737"],"is_preprint":false}],"current_model":"GABPA is an ETS-family transcription factor that directly binds ETS consensus motifs in gene promoters to activate transcription of a broad set of targets including DICER1, FoxA1, GATA3, TGFBR2, ACSL4, RACGAP1, PHB2, and ASC; it acts as a mitotic bookmarking factor, cooperates with histone acetylation to regulate transcription at the M/G1 transition, serves as a master specifier of epiblast naive pluripotency, and is required for T-lineage entry—while in cancer contexts it predominantly acts as a tumor suppressor by promoting cellular differentiation and suppressing invasion, modulating ECM stiffness via a DICER1–miR-30e–P4HA2 axis, and governing TGFβ signaling through TGFBR2, even as it also activates telomerase by selectively binding mutant TERT promoters and recruiting activated ERK/Sp1."},"narrative":{"mechanistic_narrative":"GABPA is an ETS-family DNA-binding transcription factor that binds ETS consensus motifs—preferentially closely spaced inverted ETS sites at bidirectional promoters—to activate transcription of a broad target program [PMID:8543189, PMID:7590737, PMID:24481480]. It functions as a master specifier of developmental and lineage programs: a rapid-degradation system established its requirement for major zygotic genome activation and epiblast specification, where it occupies ICM gene promoters co-bound by TFAP2C and SOX2 to drive the naive pluripotency program [PMID:39747581]. Across multiple epithelial cancers GABPA predominantly acts as a tumor suppressor by enforcing differentiation and restraining invasion: it directly activates DICER1 to limit cellular invasiveness, with re-expression of DICER1 rescuing the invasive phenotype of GABPA-depleted cells [PMID:30181547, PMID:32163919], and extends this through a DICER1→miR-30e→P4HA2 axis that lowers collagen deposition and ECM stiffness, suppresses YAP1 nuclear translocation, and restrains bladder cancer aggressiveness [PMID:40813762]. It also activates the luminal-identity transcription factors FoxA1 and GATA3 in urothelial cells [PMID:31802036] and the TGFBR2 receptor to govern TGFβ signaling in renal carcinoma, an axis silenced by L-2HG-driven GABPA promoter methylation [PMID:35549739]. In a context-specific role distinct from its tumor-suppressive function, GABPA mediates BRAF/MAPK-driven TERT reactivation by selectively recruiting activated ERK to mutant TERT promoters, where ERK phosphorylates Sp1 to open chromatin and reinforce GABPA binding [PMID:33483600]. Its transcriptional output is shaped by cofactors including METTL23 [PMID:24501276] and the ERRα/CAPER nutrient-sensing axis that couples GABPA expression to mitochondrial energy metabolism [PMID:25830341], and it acts as a mitotic bookmarking factor cooperating with histone acetylation to regulate transcription across the M/G1 transition [PMID:30836589].","teleology":[{"year":1995,"claim":"Establishing GABPA's genomic identity and biochemical class was the foundation: it was mapped to chromosome 21 and defined as an ETS-related DNA-binding protein that acts in heterodimeric complexes.","evidence":"Genomic Southern hybridization, exon sequencing, and FISH mapping, independently confirmed across two labs","pmids":["8543189","7590737"],"confidence":"Medium","gaps":["Does not establish functional targets or transcriptional output","Heterodimer partners not characterized in this corpus"]},{"year":2012,"claim":"Genome-wide cistrome mapping showed GABPA regulates a gene network distinct from other ETS factors (ELK1), assigning it a specific role in cell migration via direct targets RAC1 and KIF20A.","evidence":"ChIP-seq with gene knockdown and migration assays in MCF10A breast epithelial cells","pmids":["23284628"],"confidence":"Medium","gaps":["Mechanism of target selectivity vs. other ETS factors not resolved","Functional contribution of individual targets beyond RAC1/KIF20A unquantified"]},{"year":2014,"claim":"Two findings refined the binding logic and cofactor dependence: GABPA preferentially binds promoters with closely spaced inverted ETS motifs, and METTL23 was identified as a physical co-regulator of its transcriptional activity.","evidence":"ChIP-seq motif-spacing analysis; co-immunoprecipitation plus reciprocal overexpression/knockdown at THPO and ATP5B target promoters","pmids":["24481480","24501276"],"confidence":"Low","gaps":["p53 R273H co-localization is binding correlation only, no functional validation","Whether METTL23 methylates GABPA directly is not established"]},{"year":2015,"claim":"Upstream regulation of GABPA itself was linked to metabolism: ERRα/CAPER coactivate Gabpa transcription in response to glucose, coupling nutrient signaling to GABPA-driven mitochondrial programs.","evidence":"Coactivation assays, CAPER siRNA, metabolic measurements, and transcriptomics","pmids":["25830341"],"confidence":"Medium","gaps":["Direct mitochondrial target genes of GABPA in this context not enumerated","Single-lab finding without independent replication"]},{"year":2018,"claim":"The GABPA–DICER1 axis defined a concrete tumor-suppressive mechanism: GABPA directly activates DICER1 to restrain invasion, with DICER1 re-expression rescuing the phenotype.","evidence":"siRNA knockdown, promoter binding-site mutagenesis, rescue experiment, and patient/TCGA correlation in thyroid carcinoma","pmids":["30181547"],"confidence":"High","gaps":["Downstream miRNA effectors not identified at this stage","Generality beyond thyroid carcinoma untested here"]},{"year":2019,"claim":"Three findings broadened GABPA's role into differentiation control and cell-cycle regulation: it directly activates luminal identity factors FoxA1/GATA3 in bladder cancer, contributes to vitamin-D receptor target regulation, and acts as a mitotic bookmarking factor cooperating with histone acetylation.","evidence":"ChIP and xenograft for FoxA1/GATA3; GABPA/VDR ChIP-seq cistrome overlap in monocytes; mitotic ChIP with histone modification and M/G1 transcription analysis","pmids":["31802036","28870774","30836589"],"confidence":"Medium","gaps":["Mechanism of GABPA retention on mitotic chromatin unresolved","VDR co-localization is binding-based without functional rescue"]},{"year":2021,"claim":"A context-specific oncogenic role emerged: GABPA mediates MAPK-driven TERT reactivation by recruiting activated ERK to mutant TERT promoters, where ERK-phosphorylated Sp1 opens chromatin and reinforces GABPA binding.","evidence":"Reporter assays, ChIP, co-IP, and phosphorylation analysis in a single lab","pmids":["33483600"],"confidence":"Medium","gaps":["No independent replication of the GABPA–ERK–Sp1 loop","Reconciliation of this oncogenic role with GABPA's tumor-suppressive functions not addressed"]},{"year":2022,"claim":"The TGFBR2 axis extended GABPA's tumor-suppressor mechanism and connected it to oncometabolite signaling: GABPA activates TGFBR2 to govern TGFβ signaling, and L-2HG silences GABPA via promoter methylation.","evidence":"RNA-seq, ChIP, xenograft, and L-2HG/methylation analysis in clear cell renal cell carcinoma","pmids":["35549739"],"confidence":"High","gaps":["Other targets (RACGAP1, HPN-AS1) rest on lower-confidence single-assay evidence","How L-2HG directs methylation to the GABPA locus is unspecified"]},{"year":2025,"claim":"Degron-based studies placed GABPA at the top of early developmental hierarchies—required for zygotic genome activation and naive epiblast specification—and as required for T-lineage entry, while the DICER1 axis was mechanistically completed via miR-30e→P4HA2 control of ECM stiffness.","evidence":"Auxin-inducible degron with chromatin dynamics and single-cell transcriptomics (pluripotency); acute CRISPR KO in T-cell differentiation (preprint); transgenic mice and atomic force microscopy (ECM axis)","pmids":["39747581","40813762","39759007"],"confidence":"Medium","gaps":["T-lineage requirement is preprint-level without downstream pathway placement","Whether developmental and tumor-suppressive functions share the same target logic is unknown"]},{"year":null,"claim":"How GABPA's opposing roles—tumor suppression via differentiation versus oncogenic TERT activation—are selected within a given cell, and what determines its locus-specific recruitment, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying model reconciling tumor-suppressive and oncogenic contexts","Determinants of context-specific cofactor recruitment (ERK/Sp1 vs. TFAP2C/SOX2) undefined","Structural basis of inverted-ETS-motif preference not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,3,20,22]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[11,22]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[10,22]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,2,3,9]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,20]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,3,4]}],"complexes":[],"partners":["METTL23","SP1","ERK","TFAP2C","SOX2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q06546","full_name":"GA-binding protein alpha chain","aliases":["Nuclear respiratory factor 2 subunit alpha","Transcription factor E4TF1-60"],"length_aa":454,"mass_kda":51.3,"function":"Transcription factor capable of interacting with purine rich repeats (GA repeats). Positively regulates transcription of transcriptional repressor RHIT/ZNF205 (PubMed:22306510) (Microbial infection) Necessary for the expression of the Adenovirus E4 gene","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q06546/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/GABPA","classification":"Common Essential","n_dependent_lines":1007,"n_total_lines":1208,"dependency_fraction":0.8336092715231788},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GABPA","total_profiled":1310},"omim":[{"mim_id":"621284","title":"GA-BINDING PROTEIN TRANSCRIPTION FACTOR, SUBUNIT BETA-2; GABPB2","url":"https://www.omim.org/entry/621284"},{"mim_id":"621279","title":"LONG INTERGENIC NON-PROTEIN CODING RNA 1011; LINC01011","url":"https://www.omim.org/entry/621279"},{"mim_id":"620758","title":"TRANSLOCASE OF INNER MITOCHONDRIAL MEMBRANE 23B; TIMM23B","url":"https://www.omim.org/entry/620758"},{"mim_id":"620738","title":"ZONE OF POLARIZING ACTIVITY REGULATORY SEQUENCE; ZRS","url":"https://www.omim.org/entry/620738"},{"mim_id":"615942","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL RECESSIVE 44; MRT44","url":"https://www.omim.org/entry/615942"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GABPA"},"hgnc":{"alias_symbol":["E4TF1A","NFT2","NRF2","E4TF1-60","NRF2A"],"prev_symbol":[]},"alphafold":{"accession":"Q06546","domains":[{"cath_id":"3.10.20.90","chopping":"35-113","consensus_level":"high","plddt":85.1076,"start":35,"end":113},{"cath_id":"1.10.150.50","chopping":"159-256","consensus_level":"medium","plddt":77.8062,"start":159,"end":256},{"cath_id":"1.10.10.10","chopping":"321-432","consensus_level":"medium","plddt":89.247,"start":321,"end":432}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06546","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q06546-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q06546-F1-predicted_aligned_error_v6.png","plddt_mean":67.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GABPA","jax_strain_url":"https://www.jax.org/strain/search?query=GABPA"},"sequence":{"accession":"Q06546","fasta_url":"https://rest.uniprot.org/uniprotkb/Q06546.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q06546/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06546"}},"corpus_meta":[{"pmid":"26281945","id":"PMC_26281945","title":"Nrf2--a therapeutic target for the treatment of neurodegenerative diseases.","date":"2015","source":"Free radical biology & medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26281945","citation_count":282,"is_preprint":false},{"pmid":"25912479","id":"PMC_25912479","title":"Nrf2--A regulator of keratinocyte redox signaling.","date":"2015","source":"Free radical biology & medicine","url":"https://pubmed.ncbi.nlm.nih.gov/25912479","citation_count":148,"is_preprint":false},{"pmid":"30181547","id":"PMC_30181547","title":"GABPA inhibits invasion/metastasis in papillary thyroid carcinoma by regulating DICER1 expression.","date":"2018","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/30181547","citation_count":49,"is_preprint":false},{"pmid":"29524743","id":"PMC_29524743","title":"Nrf2a modulates the embryonic antioxidant response to perfluorooctanesulfonic acid (PFOS) in the zebrafish, Danio rerio.","date":"2018","source":"Aquatic toxicology (Amsterdam, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/29524743","citation_count":49,"is_preprint":false},{"pmid":"26325326","id":"PMC_26325326","title":"Regulation of Ahr signaling by Nrf2 during development: Effects of Nrf2a deficiency on PCB126 embryotoxicity in zebrafish (Danio rerio).","date":"2015","source":"Aquatic toxicology (Amsterdam, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/26325326","citation_count":49,"is_preprint":false},{"pmid":"31802036","id":"PMC_31802036","title":"GABPA is a master regulator of luminal identity and restrains aggressive diseases in bladder cancer.","date":"2019","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/31802036","citation_count":45,"is_preprint":false},{"pmid":"25830341","id":"PMC_25830341","title":"CAPER is vital for energy and redox homeostasis by integrating glucose-induced mitochondrial functions via ERR-α-Gabpa and stress-induced adaptive responses via NF-κB-cMYC.","date":"2015","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25830341","citation_count":39,"is_preprint":false},{"pmid":"24501276","id":"PMC_24501276","title":"METTL23, a transcriptional partner of GABPA, is essential for human cognition.","date":"2014","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24501276","citation_count":36,"is_preprint":false},{"pmid":"23284628","id":"PMC_23284628","title":"The ETS transcription factors ELK1 and GABPA regulate different gene networks to control MCF10A breast epithelial cell migration.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23284628","citation_count":33,"is_preprint":false},{"pmid":"33348637","id":"PMC_33348637","title":"Nrf2-A Molecular Target for Sepsis Patients in Critical Care.","date":"2020","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/33348637","citation_count":28,"is_preprint":false},{"pmid":"32163919","id":"PMC_32163919","title":"GABPA-dependent down-regulation of DICER1 in follicular thyroid tumours.","date":"2020","source":"Endocrine-related cancer","url":"https://pubmed.ncbi.nlm.nih.gov/32163919","citation_count":27,"is_preprint":false},{"pmid":"35549739","id":"PMC_35549739","title":"GABPA-activated TGFBR2 transcription inhibits aggressiveness but is epigenetically erased by oncometabolites in renal cell carcinoma.","date":"2022","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/35549739","citation_count":24,"is_preprint":false},{"pmid":"28870774","id":"PMC_28870774","title":"ETS transcription factor family member GABPA contributes to vitamin D receptor target gene regulation.","date":"2017","source":"The Journal of steroid biochemistry and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/28870774","citation_count":22,"is_preprint":false},{"pmid":"26814189","id":"PMC_26814189","title":"Human Lineage-Specific Transcriptional Regulation through GA-Binding Protein Transcription Factor Alpha (GABPa).","date":"2016","source":"Molecular biology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/26814189","citation_count":21,"is_preprint":false},{"pmid":"24652768","id":"PMC_24652768","title":"Heme acts through the Bach1b/Nrf2a-MafK pathway to regulate exocrine peptidase precursor genes in porphyric zebrafish.","date":"2014","source":"Disease models & mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/24652768","citation_count":20,"is_preprint":false},{"pmid":"35958019","id":"PMC_35958019","title":"Up-Regulation of RACGAP1 Promotes Progressions of Hepatocellular Carcinoma Regulated by GABPA via PI3K/AKT Pathway.","date":"2022","source":"Oxidative medicine and cellular longevity","url":"https://pubmed.ncbi.nlm.nih.gov/35958019","citation_count":20,"is_preprint":false},{"pmid":"33483600","id":"PMC_33483600","title":"Synergistic activation of mutant TERT promoter by Sp1 and GABPA in BRAFV600E-driven human cancers.","date":"2021","source":"NPJ precision oncology","url":"https://pubmed.ncbi.nlm.nih.gov/33483600","citation_count":19,"is_preprint":false},{"pmid":"24481480","id":"PMC_24481480","title":"Preferred binding of gain-of-function mutant p53 to bidirectional promoters with coordinated binding of ETS1 and GABPA to multiple binding sites.","date":"2014","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/24481480","citation_count":15,"is_preprint":false},{"pmid":"39747581","id":"PMC_39747581","title":"The transcription factor GABPA is a master regulator of naive pluripotency.","date":"2025","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/39747581","citation_count":13,"is_preprint":false},{"pmid":"30594530","id":"PMC_30594530","title":"Increased susceptibility to oxidative stress-induced toxicological evaluation by genetically modified nrf2a-deficient zebrafish.","date":"2018","source":"Journal of pharmacological and toxicological methods","url":"https://pubmed.ncbi.nlm.nih.gov/30594530","citation_count":13,"is_preprint":false},{"pmid":"37598896","id":"PMC_37598896","title":"Nrf2--a hidden bridge linking cancer stem cells to ferroptosis.","date":"2023","source":"Critical reviews in oncology/hematology","url":"https://pubmed.ncbi.nlm.nih.gov/37598896","citation_count":13,"is_preprint":false},{"pmid":"32063256","id":"PMC_32063256","title":"Embryonic exposures to mono-2-ethylhexyl phthalate induce larval steatosis in zebrafish independent of Nrf2a signaling.","date":"2020","source":"Journal of developmental origins of health and disease","url":"https://pubmed.ncbi.nlm.nih.gov/32063256","citation_count":12,"is_preprint":false},{"pmid":"34509758","id":"PMC_34509758","title":"The Nrf2a pathway impacts zebrafish offspring development with maternal preconception exposure to perfluorobutanesulfonic acid.","date":"2021","source":"Chemosphere","url":"https://pubmed.ncbi.nlm.nih.gov/34509758","citation_count":11,"is_preprint":false},{"pmid":"31858786","id":"PMC_31858786","title":"CRISPR-Generated Nrf2a Loss- and Gain-of-Function Mutants Facilitate Mechanistic Analysis of Chemical Oxidative Stress-Mediated Toxicity in Zebrafish.","date":"2020","source":"Chemical research in toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/31858786","citation_count":8,"is_preprint":false},{"pmid":"8543189","id":"PMC_8543189","title":"Assignment of the E4TF1-60 gene to human chromosome 21q21.2-q21.3.","date":"1995","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/8543189","citation_count":8,"is_preprint":false},{"pmid":"30836589","id":"PMC_30836589","title":"Identification of GA-Binding Protein Transcription Factor Alpha Subunit (GABPA) as a Novel Bookmarking Factor.","date":"2019","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/30836589","citation_count":8,"is_preprint":false},{"pmid":"7590737","id":"PMC_7590737","title":"Mapping of the human transcription factor GABPA (E4TF1-60) gene to chromosome 21.","date":"1995","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/7590737","citation_count":7,"is_preprint":false},{"pmid":"39489850","id":"PMC_39489850","title":"GABPA inhibits tumorigenesis in clear cell renal cell carcinoma by regulating ferroptosis through ACSL4.","date":"2024","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/39489850","citation_count":6,"is_preprint":false},{"pmid":"37587393","id":"PMC_37587393","title":"Prohibitin2/PHB2, Transcriptionally Regulated by GABPA, Inhibits Cell Growth via PRKN/Parkin-dependent Mitophagy in Endometriosis.","date":"2023","source":"Reproductive sciences (Thousand Oaks, Calif.)","url":"https://pubmed.ncbi.nlm.nih.gov/37587393","citation_count":5,"is_preprint":false},{"pmid":"36042907","id":"PMC_36042907","title":"GABPA protects against gastric cancer deterioration via negatively regulating GPX1.","date":"2022","source":"Journal of medical biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36042907","citation_count":5,"is_preprint":false},{"pmid":"36717045","id":"PMC_36717045","title":"Evaluation of the oxidative toxicity induced by lead, manganese, and cadmium using genetically modified nrf2a-mutant zebrafish.","date":"2023","source":"Comparative biochemistry and physiology. Toxicology & pharmacology : CBP","url":"https://pubmed.ncbi.nlm.nih.gov/36717045","citation_count":5,"is_preprint":false},{"pmid":"39114737","id":"PMC_39114737","title":"GABPA-Mediated Expression of HPN-AS1 Facilitates Cell Apoptosis and Inhibits Cell Proliferation in Hepatocellular Carcinoma by Promoting eIF4A3 Degradation.","date":"2024","source":"The Turkish journal of gastroenterology : the official journal of Turkish Society of Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/39114737","citation_count":3,"is_preprint":false},{"pmid":"41422226","id":"PMC_41422226","title":"Suppressing the OTUD7A/KDM5B/GABPA axis enhances the sensitivity of cisplatin through inducing ferroptosis in KRAS-mutant LUAD.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41422226","citation_count":1,"is_preprint":false},{"pmid":"34194624","id":"PMC_34194624","title":"TERT and its binding protein: overexpression of GABPA/B in high grade gliomas.","date":"2021","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/34194624","citation_count":1,"is_preprint":false},{"pmid":"40813762","id":"PMC_40813762","title":"The ETS transcription factor GABPA inhibits bladder cancer aggressiveness by repressing extracellular matrix deposition and mechanotransduction signaling.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/40813762","citation_count":1,"is_preprint":false},{"pmid":"38628657","id":"PMC_38628657","title":"Crucial role of lncRNA NONHSAG037054.2 and GABPA, and their related functional networks, in ankylosing spondylitis.","date":"2024","source":"Experimental and therapeutic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/38628657","citation_count":1,"is_preprint":false},{"pmid":"39759007","id":"PMC_39759007","title":"miR-450b-5p promotes development of endometriosis by inhibiting the GABPA/HOXD10 axis.","date":"2024","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/39759007","citation_count":1,"is_preprint":false},{"pmid":"40749747","id":"PMC_40749747","title":"HMGB1 activates caspase-1 and induces hepatic stellate cell activation via GABPA-ASC.","date":"2025","source":"Biochimica et biophysica acta. Molecular cell research","url":"https://pubmed.ncbi.nlm.nih.gov/40749747","citation_count":0,"is_preprint":false},{"pmid":"39605507","id":"PMC_39605507","title":"The transcription factor GABPA is a master regulator of naïve pluripotency.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39605507","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.04.22.649893","title":"T cell development from expanded hematopoietic progenitors reveals progression control by  <i>Lmo2</i>  ,  <i>Erg</i>  ,  <i>Spi1</i>  ,  <i>Hoxa9</i>  , and  <i>Meis1</i>","date":"2025-04-26","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.22.649893","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.12.603281","title":"Waves of transcription drive erythroid differentiation and launch the NRF2-activated antioxidant program","date":"2024-07-16","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.12.603281","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22228,"output_tokens":5470,"usd":0.074367,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13902,"output_tokens":3587,"usd":0.079592,"stage2_stop_reason":"end_turn"},"total_usd":0.153959,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2018,\n      \"finding\": \"GABPA directly activates DICER1 transcription by binding to the DICER1 promoter; mutation of the GABPA binding site in the DICER1 promoter diminished basal DICER1 promoter activity and abolished GABPA-stimulated promoter activity. GABPA depletion reduced DICER1 expression and increased cellular invasion in thyroid carcinoma cells, while forced DICER1 expression rescued the invasive phenotype of GABPA-depleted cells.\",\n      \"method\": \"siRNA knockdown, GABPA binding site mutagenesis in promoter-reporter assay, forced DICER1 re-expression rescue experiment, correlation analysis in patient samples\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — promoter mutagenesis, rescue experiment, and replication across patient cohorts and TCGA dataset in one study\",\n      \"pmids\": [\"30181547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GABPA binds to the DICER1 promoter and regulates DICER1 expression in follicular thyroid carcinoma (FTC) cells; GABPA depletion reduced DICER1 expression, stimulated cell proliferation, and altered miRNA expression, confirming a direct transcriptional regulatory link.\",\n      \"method\": \"ChIP assay, siRNA knockdown of GABPA in FTC cell lines, miRNA expression profiling\",\n      \"journal\": \"Endocrine-related cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus functional KD phenotype, independently replicating the GABPA–DICER1 axis from PMID:30181547\",\n      \"pmids\": [\"32163919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GABPA directly activates transcription of FoxA1 and GATA3, key transcription factors driving luminal differentiation of urothelial cells, thereby dictating luminal identity in bladder cancer cells and suppressing aggressive/basal phenotypes, stemness, invasiveness, and cisplatin resistance.\",\n      \"method\": \"siRNA/shRNA knockdown and overexpression of GABPA, ChIP-based identification of FoxA1 and GATA3 as direct targets, xenograft transplant model for in vivo metastasis, TCGA/GEO dataset analyses\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP for direct target identification, in vivo xenograft model, multiple orthogonal functional assays in one study\",\n      \"pmids\": [\"31802036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GABPA directly activates TGFBR2 transcription (identified by RNA-seq and ChIP); GABPA and TGFBR2 phenocopy each other in clear cell renal cell carcinoma (ccRCC) cells, governing TGFβ signaling to suppress proliferation, invasion, and stemness. The oncometabolite L-2-hydroxyglutarate (L-2HG) silences GABPA expression by increasing GABPA gene methylation, thereby disrupting the GABPA–TGFβ axis.\",\n      \"method\": \"RNA sequencing, ChIP assay, siRNA knockdown and overexpression, xenograft mouse model, L-2HG treatment with methylation analysis, immunohistochemistry on patient specimens\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNA-seq + ChIP for target identification, in vivo xenograft, epigenetic mechanism, multiple orthogonal methods in one study\",\n      \"pmids\": [\"35549739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GABPA mediates regulation of BRAFV600E/MAPK signaling on TERT reactivation by selectively recruiting activated ERK to the mutant TERT promoter, where ERK phosphorylates Sp1, causing HDAC1 dissociation and active chromatin. Phosphorylated Sp1 further enhances GABPA binding to the mutant TERT promoter, establishing a synergistic activation loop.\",\n      \"method\": \"Reporter assays, ChIP assays, co-immunoprecipitation, overexpression/knockdown, phosphorylation analysis\",\n      \"journal\": \"NPJ precision oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and co-IP evidence from a single lab, multiple complementary assays but no independent replication\",\n      \"pmids\": [\"33483600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"METTL23 physically interacts with GABPA (co-immunoprecipitation). Overexpression of METTL23 increased transcriptional activity at the THPO promoter (a GABPA target), while siRNA knockdown of METTL23 decreased expression of ATP5B (another GABPA target), establishing METTL23 as a co-regulator of GABPA transcriptional function.\",\n      \"method\": \"Co-immunoprecipitation, promoter-reporter assay for THPO, siRNA knockdown of METTL23 with qRT-PCR for ATP5B\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal functional assays (overexpression + knockdown) plus Co-IP from a single lab\",\n      \"pmids\": [\"24501276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GABPA controls cell migration in MCF10A breast epithelial cells by regulating a gene network distinct from that of ELK1. Direct GABPA targets RAC1 and KIF20A were identified as functionally important for this migration control.\",\n      \"method\": \"Chromatin immunoprecipitation-sequencing, gene knockdown, cell migration assays in breast epithelial cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq for direct target identification combined with functional KD migration assays, single lab\",\n      \"pmids\": [\"23284628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CAPER coactivates ERR-α-mediated Gabpa transcription in response to nutrient (glucose) signaling, linking nutrient-induced mitochondrial energy metabolism to GABPA expression. Inhibition of CAPER arrests ATP generation and GABPA-dependent mitochondrial transcriptional programs.\",\n      \"method\": \"Coactivation assays, siRNA inhibition of CAPER, metabolic measurements (ATP, respiration), transcriptome analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional coactivation assay and metabolic phenotyping in a single study, single lab\",\n      \"pmids\": [\"25830341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The GABPA cistrome in THP-1 monocytes (3822 loci) overlaps significantly with VDR binding sites; ~23% of persistent VDR binding sites co-localize with GABPA. About 40% of GABPA binding sites are at transcription start sites, including ~100 of 1,25(OH)2D3 target genes, indicating GABPA contributes to differential vitamin D receptor target gene regulation.\",\n      \"method\": \"ChIP-sequencing of GABPA and VDR cistromes in THP-1 monocytes, bioinformatic co-localization analysis with PU.1\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq genome-wide binding data, single lab, no functional rescue\",\n      \"pmids\": [\"28870774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GABPA binds to human-specific promoter sequences to regulate transcription of ~1,215 candidate primary target genes; substitutions creating or disrupting GABPA consensus binding sequences functionally alter promoter activity both in human and nonhuman primate cell backgrounds, demonstrated by promoter-reporter assays and GABPA knockdown.\",\n      \"method\": \"ChIP-sequencing, promoter-reporter assays in human and African green monkey cells, GABPA knockdown followed by expression profiling\",\n      \"journal\": \"Molecular biology and evolution\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus functional promoter mutagenesis assays, single lab\",\n      \"pmids\": [\"26814189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GABPA remains bound to specific genomic sites during mitosis and cooperates with histone acetylation marks (H3K9/14Ac, H3K27Ac, H4K5Ac) to act as a mitotic bookmarking factor. Depletion of GABPA increases H4K5Ac levels at target gene regions and induces transcriptional activation in early G1, suggesting GABPA negatively regulates transcription during the M/G1 transition.\",\n      \"method\": \"ChIP in mitotic cells, GABPA depletion with histone modification analysis, transcription assays at M/G1 transition\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP in synchronized cells plus functional depletion with histone and transcriptional readouts, single lab\",\n      \"pmids\": [\"30836589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Gain-of-function mutant p53 (R273H) co-localizes genomically with GABPA binding sites at bidirectional promoters enriched for closely spaced ETS motifs. GABPA shows increased binding signal with higher numbers of ETS motifs per promoter and prefers promoters with closely spaced inverted ETS motifs, in contrast to ETS1.\",\n      \"method\": \"ChIP-seq for p53 R273H, ETS1, and GABPA; bioinformatic analysis of ETS motif spacing and binding signal\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — ChIP-seq binding analysis only, no functional validation of the interaction mechanism\",\n      \"pmids\": [\"24481480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GABPA binds directly to the RACGAP1 promoter and regulates its transcription in hepatocellular carcinoma, as confirmed by luciferase reporter and ChIP assays.\",\n      \"method\": \"Luciferase reporter assay, ChIP assay\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, ChIP and reporter assay without independent replication or mutagenesis\",\n      \"pmids\": [\"35958019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GABPA negatively regulates GPX1 transcription in gastric cancer cells; GABPA binds GPX1 via a predicted site confirmed by dual-luciferase reporter assay, and overexpression of GABPA reduces GPX1 levels and blocks cell migration.\",\n      \"method\": \"Dual-luciferase reporter assay, GABPA overexpression, transwell and wound healing migration assays\",\n      \"journal\": \"Journal of medical biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, luciferase reporter assay only, no ChIP or mutagenesis\",\n      \"pmids\": [\"36042907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GABPA binds directly to the PHB2 promoter region and controls transcriptional expression of PHB2 in endometriosis. PHB2 downregulation in ectopic endometrium leads to impaired PRKN/Parkin-mediated mitophagy, promoting cell proliferation, migration, and invasion.\",\n      \"method\": \"Bioinformatics, ChIP assay, reporter assay for GABPA-PHB2 promoter interaction, PHB2 overexpression/knockdown with mitophagy marker analysis\",\n      \"journal\": \"Reproductive sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ChIP and reporter assay from single lab with limited mechanistic depth on GABPA itself\",\n      \"pmids\": [\"37587393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GABPA directly binds to the ACSL4 promoter region and promotes ACSL4 transcription, increasing susceptibility of clear cell renal cell carcinoma cells to ferroptosis; GABPA overexpression suppressed ccRCC cell proliferation, migration, and invasion through this pathway.\",\n      \"method\": \"ChIP assay, GABPA overexpression in vitro and in vivo, ferroptosis assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, ChIP plus overexpression phenotype, limited mechanistic depth\",\n      \"pmids\": [\"39489850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GABPA functions as a transcription factor for HPN-AS1 (a lncRNA) by binding its promoter, as confirmed by ChIP and luciferase reporter assays in hepatocellular carcinoma cells.\",\n      \"method\": \"ChIP assay, luciferase reporter assay\",\n      \"journal\": \"The Turkish journal of gastroenterology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, ChIP and reporter assay without mutagenesis or independent replication\",\n      \"pmids\": [\"39114737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GABPA induces miR-30e expression by stimulating DICER1 transcription; higher miR-30e levels consequently target P4HA2 for downregulation. This GABPA→DICER1→miR-30e→P4HA2 axis reduces collagen I and III formation (ECM deposition), lowers ECM stiffness, suppresses YAP1 nuclear translocation (mechanotransduction), and restrains bladder cancer aggressiveness in xenograft models.\",\n      \"method\": \"GABPA-transgenic mice, GABPA overexpression/depletion in BC cells, atomic force microscopy of ECM rigidity, xenograft metastasis model, miR-30e manipulation, P4HA2 overexpression rescue\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods including transgenic mice, atomic force microscopy, and in vivo xenograft, single lab\",\n      \"pmids\": [\"40813762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GABPA regulates ASC transcription (confirmed by luciferase reporter and ChIP assays); HMGB1 activates caspase-1 through this GABPA-regulated ASC transcription in hepatic stellate cells, promoting liver fibrosis.\",\n      \"method\": \"Luciferase reporter assay, ChIP assay, immunofluorescence, immunoblotting, lentiviral transfection, caspase-1 inhibitor (Z-YVAD-FMK) treatment\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, ChIP and reporter assay, no independent replication\",\n      \"pmids\": [\"40749747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GABPA is required for T-lineage entry in early T cell development; acute CRISPR knockout of Gabpa blocks T-lineage developmental progression in an in vitro differentiation system derived from expanded hematopoietic progenitors.\",\n      \"method\": \"Acute CRISPR knockout of Gabpa in hematopoietic progenitor expansion + T cell differentiation culture system, single-cell RNA sequencing\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, KO phenotype without downstream mechanistic pathway placement for GABPA specifically\",\n      \"pmids\": [\"bio_10.1101_2025.04.22.649893\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GABPA is required for naive pluripotency establishment; using a targeted rapid protein degradation system, GABPA depletion disrupted major zygotic genome activation (ZGA) and epiblast (EPI) specification during E3.5–E4.5 transition, affecting 47% of EPI genes. GABPA binding dynamics show it occupies ICM gene promoters co-bound by TFAP2C and SOX2 at E3.5 to drive the EPI program at E4.5.\",\n      \"method\": \"Targeted rapid protein degradation (auxin-inducible degron system), chromatin binding dynamics analysis (ChIP/ATAC), single-cell transcriptomics\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein degradation system with chromatin binding dynamics and transcriptomic readouts, single lab, peer-reviewed\",\n      \"pmids\": [\"39747581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"miR-450b-5p directly targets GABPA (reducing its expression), and GABPA in turn binds directly to the HOXD10 promoter to regulate HOXD10 transcription. Knockdown of GABPA promoted proliferation and invasion of endometriotic cells in vivo and in vitro, phenocopying miR-450b-5p overexpression.\",\n      \"method\": \"miRNA target validation, GABPA knockdown/overexpression, promoter binding assay for HOXD10, in vivo mouse endometriosis model with lentiviral HOXD10 overexpression\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, promoter binding assay without ChIP; mechanistic depth for GABPA limited to regulatory axis identification\",\n      \"pmids\": [\"39759007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The GABPA (E4TF1-60) gene was mapped to human chromosome 21q21.2-q21.3 and shown to contain ten exons. GABPA is an ETS-related DNA-binding protein that forms heterodimers with other polypeptides.\",\n      \"method\": \"Genomic Southern hybridization, exon sequencing, FISH (independently confirmed by FISH, somatic cell hybrids, YAC hybridization in PMID:7590737)\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Strong — independently replicated chromosomal mapping by two labs using orthogonal methods\",\n      \"pmids\": [\"8543189\", \"7590737\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GABPA is an ETS-family transcription factor that directly binds ETS consensus motifs in gene promoters to activate transcription of a broad set of targets including DICER1, FoxA1, GATA3, TGFBR2, ACSL4, RACGAP1, PHB2, and ASC; it acts as a mitotic bookmarking factor, cooperates with histone acetylation to regulate transcription at the M/G1 transition, serves as a master specifier of epiblast naive pluripotency, and is required for T-lineage entry—while in cancer contexts it predominantly acts as a tumor suppressor by promoting cellular differentiation and suppressing invasion, modulating ECM stiffness via a DICER1–miR-30e–P4HA2 axis, and governing TGFβ signaling through TGFBR2, even as it also activates telomerase by selectively binding mutant TERT promoters and recruiting activated ERK/Sp1.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GABPA is an ETS-family DNA-binding transcription factor that binds ETS consensus motifs—preferentially closely spaced inverted ETS sites at bidirectional promoters—to activate transcription of a broad target program [#22, #11]. It functions as a master specifier of developmental and lineage programs: a rapid-degradation system established its requirement for major zygotic genome activation and epiblast specification, where it occupies ICM gene promoters co-bound by TFAP2C and SOX2 to drive the naive pluripotency program [#20]. Across multiple epithelial cancers GABPA predominantly acts as a tumor suppressor by enforcing differentiation and restraining invasion: it directly activates DICER1 to limit cellular invasiveness, with re-expression of DICER1 rescuing the invasive phenotype of GABPA-depleted cells [#0, #1], and extends this through a DICER1→miR-30e→P4HA2 axis that lowers collagen deposition and ECM stiffness, suppresses YAP1 nuclear translocation, and restrains bladder cancer aggressiveness [#17]. It also activates the luminal-identity transcription factors FoxA1 and GATA3 in urothelial cells [#2] and the TGFBR2 receptor to govern TGFβ signaling in renal carcinoma, an axis silenced by L-2HG-driven GABPA promoter methylation [#3]. In a context-specific role distinct from its tumor-suppressive function, GABPA mediates BRAF/MAPK-driven TERT reactivation by selectively recruiting activated ERK to mutant TERT promoters, where ERK phosphorylates Sp1 to open chromatin and reinforce GABPA binding [#4]. Its transcriptional output is shaped by cofactors including METTL23 [#5] and the ERRα/CAPER nutrient-sensing axis that couples GABPA expression to mitochondrial energy metabolism [#7], and it acts as a mitotic bookmarking factor cooperating with histone acetylation to regulate transcription across the M/G1 transition [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing GABPA's genomic identity and biochemical class was the foundation: it was mapped to chromosome 21 and defined as an ETS-related DNA-binding protein that acts in heterodimeric complexes.\",\n      \"evidence\": \"Genomic Southern hybridization, exon sequencing, and FISH mapping, independently confirmed across two labs\",\n      \"pmids\": [\"8543189\", \"7590737\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish functional targets or transcriptional output\", \"Heterodimer partners not characterized in this corpus\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Genome-wide cistrome mapping showed GABPA regulates a gene network distinct from other ETS factors (ELK1), assigning it a specific role in cell migration via direct targets RAC1 and KIF20A.\",\n      \"evidence\": \"ChIP-seq with gene knockdown and migration assays in MCF10A breast epithelial cells\",\n      \"pmids\": [\"23284628\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of target selectivity vs. other ETS factors not resolved\", \"Functional contribution of individual targets beyond RAC1/KIF20A unquantified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Two findings refined the binding logic and cofactor dependence: GABPA preferentially binds promoters with closely spaced inverted ETS motifs, and METTL23 was identified as a physical co-regulator of its transcriptional activity.\",\n      \"evidence\": \"ChIP-seq motif-spacing analysis; co-immunoprecipitation plus reciprocal overexpression/knockdown at THPO and ATP5B target promoters\",\n      \"pmids\": [\"24481480\", \"24501276\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"p53 R273H co-localization is binding correlation only, no functional validation\", \"Whether METTL23 methylates GABPA directly is not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Upstream regulation of GABPA itself was linked to metabolism: ERRα/CAPER coactivate Gabpa transcription in response to glucose, coupling nutrient signaling to GABPA-driven mitochondrial programs.\",\n      \"evidence\": \"Coactivation assays, CAPER siRNA, metabolic measurements, and transcriptomics\",\n      \"pmids\": [\"25830341\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mitochondrial target genes of GABPA in this context not enumerated\", \"Single-lab finding without independent replication\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The GABPA–DICER1 axis defined a concrete tumor-suppressive mechanism: GABPA directly activates DICER1 to restrain invasion, with DICER1 re-expression rescuing the phenotype.\",\n      \"evidence\": \"siRNA knockdown, promoter binding-site mutagenesis, rescue experiment, and patient/TCGA correlation in thyroid carcinoma\",\n      \"pmids\": [\"30181547\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream miRNA effectors not identified at this stage\", \"Generality beyond thyroid carcinoma untested here\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Three findings broadened GABPA's role into differentiation control and cell-cycle regulation: it directly activates luminal identity factors FoxA1/GATA3 in bladder cancer, contributes to vitamin-D receptor target regulation, and acts as a mitotic bookmarking factor cooperating with histone acetylation.\",\n      \"evidence\": \"ChIP and xenograft for FoxA1/GATA3; GABPA/VDR ChIP-seq cistrome overlap in monocytes; mitotic ChIP with histone modification and M/G1 transcription analysis\",\n      \"pmids\": [\"31802036\", \"28870774\", \"30836589\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of GABPA retention on mitotic chromatin unresolved\", \"VDR co-localization is binding-based without functional rescue\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A context-specific oncogenic role emerged: GABPA mediates MAPK-driven TERT reactivation by recruiting activated ERK to mutant TERT promoters, where ERK-phosphorylated Sp1 opens chromatin and reinforces GABPA binding.\",\n      \"evidence\": \"Reporter assays, ChIP, co-IP, and phosphorylation analysis in a single lab\",\n      \"pmids\": [\"33483600\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No independent replication of the GABPA–ERK–Sp1 loop\", \"Reconciliation of this oncogenic role with GABPA's tumor-suppressive functions not addressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The TGFBR2 axis extended GABPA's tumor-suppressor mechanism and connected it to oncometabolite signaling: GABPA activates TGFBR2 to govern TGFβ signaling, and L-2HG silences GABPA via promoter methylation.\",\n      \"evidence\": \"RNA-seq, ChIP, xenograft, and L-2HG/methylation analysis in clear cell renal cell carcinoma\",\n      \"pmids\": [\"35549739\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other targets (RACGAP1, HPN-AS1) rest on lower-confidence single-assay evidence\", \"How L-2HG directs methylation to the GABPA locus is unspecified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Degron-based studies placed GABPA at the top of early developmental hierarchies—required for zygotic genome activation and naive epiblast specification—and as required for T-lineage entry, while the DICER1 axis was mechanistically completed via miR-30e→P4HA2 control of ECM stiffness.\",\n      \"evidence\": \"Auxin-inducible degron with chromatin dynamics and single-cell transcriptomics (pluripotency); acute CRISPR KO in T-cell differentiation (preprint); transgenic mice and atomic force microscopy (ECM axis)\",\n      \"pmids\": [\"39747581\", \"40813762\", \"39759007\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"T-lineage requirement is preprint-level without downstream pathway placement\", \"Whether developmental and tumor-suppressive functions share the same target logic is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GABPA's opposing roles—tumor suppression via differentiation versus oncogenic TERT activation—are selected within a given cell, and what determines its locus-specific recruitment, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model reconciling tumor-suppressive and oncogenic contexts\", \"Determinants of context-specific cofactor recruitment (ERK/Sp1 vs. TFAP2C/SOX2) undefined\", \"Structural basis of inverted-ETS-motif preference not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 3, 20, 22]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [11, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [10, 22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 2, 3, 9]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 20]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 3, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"METTL23\", \"Sp1\", \"ERK\", \"TFAP2C\", \"SOX2\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}