{"gene":"GSE1","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2002,"finding":"GSE1 (then described as a candidate X-linked mental retardation gene product) was identified as a component of a novel multiprotein corepressor complex containing HDAC1/2 and BHC110 (LSD1), along with TFII-I; this complex functions to keep genes silent through chromatin structure modification.","method":"Biochemical purification of native complexes, mass spectrometry, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and biochemical purification identifying complex composition, foundational study","pmids":["12493763"],"is_preprint":false},{"year":2005,"finding":"GSE1 is a component of the BHC (BRAF-HDAC/CoREST) complex; the CoREST subunit of this complex is essential for LSD1/BHC110-mediated H3K4 demethylation on nucleosomal substrates, placing GSE1 within a multi-subunit chromatin-remodeling and transcriptional repression machinery.","method":"In vitro reconstitution of BHC complex from recombinant subunits, nucleosomal demethylation assay, CoREST depletion in cell culture","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with nucleosomal substrate and functional rescue experiments","pmids":["16079794"],"is_preprint":false},{"year":2011,"finding":"GSE1 was identified as a scaffolding subunit of the BHC/BRAF-HDAC complex (an ELM-SANT domain-containing HDAC complex), which is selectively targeted by certain HDAC inhibitors (aminobenzamides) with distinct profiles relative to Sin3 and NCoR complexes.","method":"Affinity capture of HDAC complexes combined with quantitative mass spectrometry (chemoproteomics)","journal":"Nature biotechnology","confidence":"Medium","confidence_rationale":"Tier 2 — quantitative AP-MS identifying GSE1 in a specific HDAC complex, single study","pmids":["21258344"],"is_preprint":false},{"year":2013,"finding":"GSE1 was confirmed as a component of the HDAC1-containing BHC/CoREST complex in T cells; HDAC1 interactions within chromatin-remodeling complexes including this one are largely stable as measured by quantitative proteomics.","method":"Immunoaffinity purification, quantitative mass spectrometry (label-free and SILAC), fluorescence microscopy","journal":"Molecular systems biology","confidence":"Medium","confidence_rationale":"Tier 2 — quantitative proteomics with multiple methods, single study","pmids":["23752268"],"is_preprint":false},{"year":2016,"finding":"GSE1 silencing in breast cancer cells significantly suppressed proliferation, migration, and invasion; GSE1 was identified as a direct target of miR-489-5p, and restoration of miR-489-5p phenocopied GSE1 knockdown. Depletion of GSE1 by siRNA abrogated enhanced proliferation and invasion caused by miR-489-5p depletion.","method":"siRNA knockdown, miRNA overexpression/depletion, luciferase reporter assay (direct target validation), cell proliferation/migration/invasion assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 — loss-of-function with defined phenotype, direct miRNA target validation by reporter assay","pmids":["26828271"],"is_preprint":false},{"year":2021,"finding":"GSE1 depletion in AML (NB4) cells caused decreased cell viability in vitro and tumor growth in vivo; LSD1 inhibitors (MC2580, DDP-38003) downregulate GSE1 protein and trigger myeloid differentiation. LSD1 and GSE1 co-localize at promoters of immune response and cytokine-signaling genes, enforcing their transcriptional silencing; LSD1 inhibition reduces GSE1 binding to these promoters, activating transcriptional programs.","method":"shRNA/siRNA knockdown, in vivo xenograft, ChIP, gene expression profiling, pharmacological LSD1 inhibition","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP co-localization and gene expression rescue experiments in multiple systems","pmids":["34862459"],"is_preprint":false},{"year":2021,"finding":"GSE1 overexpression promotes trastuzumab resistance in HER2-positive gastric cancer cells; BCL-2 was identified as a downstream gene positively regulated by GSE1, and GSE1 depletion decreased trastuzumab resistance.","method":"siRNA knockdown, acquired resistance cell line model, western blot, cell viability assays","journal":"BioMed research international","confidence":"Low","confidence_rationale":"Tier 3 — single lab, single KD approach with limited mechanistic dissection","pmids":["33623790"],"is_preprint":false},{"year":2021,"finding":"shRNA-mediated GSE1 knockdown in metastatic prostate cancer cells inhibited proliferation, migration, and tumorsphere formation, with suppression of VIM, SNAI2, and BCL2 and upregulation of TACSTD2 and BAX; GSE1 and TACSTD2 show a direct inverse expression relationship driving metastatic disease and castration resistance.","method":"shRNA knockdown, in vitro cell assays (proliferation, migration, tumorsphere), in vivo xenograft, multi-omics cohort analysis","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2–3 — loss-of-function with defined phenotype and downstream target identification in vitro and in vivo","pmids":["34439112"],"is_preprint":false},{"year":2023,"finding":"GSE1 forms a complex with the HDAC1/CoREST co-repressor complex (identified by AP-MS); loss of GSE1 impairs DNA damage response (DDR), ATR signaling, and γH2AX formation. GSE1 is essential for binding of deubiquitinase USP22 to CoREST and for H2B K120 deubiquitination in response to DNA damage; loss of GSE1 does not affect CoREST histone deacetylation activity. Thus GSE1 anchors a USP22-GSE1-CoREST multi-enzymatic eraser subcomplex.","method":"Affinity purification mass spectrometry (AP-MS), phosphoproteomics/phosphorylome analysis, CRISPR knockout, in vivo DNA damage assays (γH2AX, ATR-SQ motif analysis), deubiquitination assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 — AP-MS complex identification + phosphoproteomics + KO phenotype + enzymatic assay, multiple orthogonal methods","pmids":["37878419"],"is_preprint":false},{"year":2023,"finding":"Gse1 is required for mouse placental development; zygotic deletion causes embryonic lethality from E12.5 and maternal deletion increases prenatal death. Gse1 mutant placentas are deficient in MCT4+ syncytiotrophoblast II from E14.5, and placenta-specific deletion recapitulates embryonic defects, demonstrating a placenta-autonomous role for Gse1.","method":"Conditional and germline knockout mice, placenta-specific Cre-mediated deletion, histological analysis, gene expression profiling (single-cell level), immunofluorescence","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic deletion models with defined cellular and developmental phenotypes, tissue-specific rescue","pmids":["37019373"],"is_preprint":false},{"year":2024,"finding":"GSE1 interacts with HDAC1 and other BHC (BRAF-HDAC) complex components in lung adenocarcinoma cells; GSE1 cooperates with HDAC1 to suppress transcription of the tumor suppressor KLF6, thereby promoting proliferation and migration of non-small cell lung cancer cells.","method":"Co-immunoprecipitation, RNA-seq (transcriptome of GSE1-knockdown cells), qRT-PCR, western blot, bioinformatics (HDAC1 binding site analysis), siRNA knockdown","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP confirming complex membership, transcriptome + target validation by qRT-PCR/western blot","pmids":["38886911"],"is_preprint":false}],"current_model":"GSE1 is a chromatin-associated scaffolding protein that is an integral component of the HDAC1/CoREST/BHC (LSD1-containing) co-repressor complex, where it anchors the deubiquitinase USP22 to enable H2B-K120 deubiquitination during the DNA damage response, cooperates with HDAC1 to silence target genes (including KLF6 and immune/cytokine-pathway genes), and is required for mouse placental development; its overexpression in multiple cancers (breast, lung, gastric, prostate, AML) drives proliferation, invasion, therapy resistance, and blocks differentiation through transcriptional repression of tumor suppressors and anti-apoptotic gene regulation."},"narrative":{"teleology":[{"year":2002,"claim":"Establishing GSE1 as a subunit of a novel HDAC1/2-containing co-repressor complex (BHC/CoREST) resolved its molecular context and linked it to chromatin-mediated gene silencing.","evidence":"Biochemical purification and mass spectrometry of native HDAC-containing complexes, with reciprocal co-immunoprecipitation","pmids":["12493763"],"confidence":"High","gaps":["Direct contribution of GSE1 to complex activity was not tested","Whether GSE1 contacts DNA or histones directly was unknown"]},{"year":2005,"claim":"Demonstrating that CoREST is required for LSD1-mediated nucleosomal H3K4 demethylation placed the BHC complex — and GSE1 within it — in a defined enzymatic pathway of transcriptional repression on chromatin substrates.","evidence":"In vitro reconstitution of BHC complex with recombinant subunits and nucleosomal demethylation assays","pmids":["16079794"],"confidence":"High","gaps":["GSE1's specific role within the complex during demethylation was not dissected","Genomic targets of the complex in vivo were not identified"]},{"year":2011,"claim":"Chemoproteomic profiling confirmed GSE1 as a scaffolding subunit specifically of the BHC/BRAF-HDAC complex, distinguishing it from Sin3 and NCoR complexes, and revealed that certain HDAC inhibitors selectively target this complex.","evidence":"Affinity capture of HDAC complexes combined with quantitative mass spectrometry","pmids":["21258344"],"confidence":"Medium","gaps":["Whether GSE1 mediates pharmacological selectivity was not tested","No functional assay for GSE1 loss was performed"]},{"year":2016,"claim":"Loss-of-function studies in breast cancer cells established GSE1 as an oncogenic effector, showing that its silencing suppresses proliferation, migration, and invasion, and identifying GSE1 as a direct target of the tumor-suppressive miR-489-5p.","evidence":"siRNA knockdown, miRNA overexpression/depletion, luciferase reporter assay for direct target validation, cell proliferation/migration/invasion assays","pmids":["26828271"],"confidence":"Medium","gaps":["Mechanism by which GSE1 drives pro-invasive transcription was not defined","In vivo validation was not performed"]},{"year":2021,"claim":"ChIP and pharmacological studies in AML cells showed that GSE1 co-localizes with LSD1 at promoters of immune-response and cytokine-signaling genes to enforce their silencing; LSD1 inhibition reduces GSE1 promoter occupancy and triggers myeloid differentiation, linking GSE1 to differentiation blockade in leukemia.","evidence":"ChIP, gene expression profiling, shRNA/siRNA knockdown, in vivo xenograft, pharmacological LSD1 inhibition with MC2580/DDP-38003","pmids":["34862459"],"confidence":"Medium","gaps":["Whether GSE1 recruitment depends on LSD1 catalytic activity or protein–protein interaction was not resolved","Direct DNA-binding capacity of GSE1 was not addressed"]},{"year":2021,"claim":"Studies in prostate and gastric cancer extended GSE1's pro-tumorigenic role by showing that its depletion suppresses EMT markers, BCL2, and tumorsphere formation while upregulating pro-apoptotic and epithelial genes, implicating GSE1 in therapy resistance and metastatic progression.","evidence":"shRNA knockdown, in vitro proliferation/migration/tumorsphere assays, in vivo xenograft, western blot, multi-omics cohort analysis","pmids":["34439112","33623790"],"confidence":"Medium","gaps":["Trastuzumab resistance mechanism via BCL-2 relied on a single knockdown approach without chromatin-level data","Whether GSE1 directly regulates BCL2 transcription or acts indirectly was not determined"]},{"year":2023,"claim":"Defining GSE1 as the anchor that recruits USP22 to the CoREST complex resolved its unique mechanistic contribution: GSE1 is dispensable for HDAC activity but essential for H2B-K120 deubiquitination and a functional DNA damage response, establishing a multi-enzymatic eraser subcomplex (USP22–GSE1–CoREST).","evidence":"AP-MS, CRISPR knockout, phosphoproteomics, γH2AX and ATR-SQ motif analysis, in vitro deubiquitination assays","pmids":["37878419"],"confidence":"High","gaps":["Structural basis for GSE1–USP22 interaction is unknown","Whether GSE1's DDR role is relevant in vivo (animal models) has not been tested","Contribution of USP22 anchoring versus other GSE1 functions to cancer phenotypes is not disentangled"]},{"year":2023,"claim":"Genetic deletion in mice revealed that Gse1 is essential for placental development, specifically for syncytiotrophoblast-II differentiation, demonstrating a physiological developmental role beyond cancer contexts.","evidence":"Conditional and germline knockout mice, placenta-specific Cre-mediated deletion, single-cell gene expression profiling, immunofluorescence","pmids":["37019373"],"confidence":"High","gaps":["Downstream transcriptional targets mediating syncytiotrophoblast-II failure are not fully characterized","Whether the placental phenotype depends on CoREST complex function or a GSE1-autonomous mechanism is unclear"]},{"year":2024,"claim":"Transcriptomic analysis of GSE1-depleted lung adenocarcinoma cells identified KLF6 as a key tumor-suppressor target co-repressed by GSE1 and HDAC1, providing a specific gene-level mechanism for GSE1-driven proliferation.","evidence":"Co-immunoprecipitation, RNA-seq, qRT-PCR, western blot, siRNA knockdown in NSCLC cells","pmids":["38886911"],"confidence":"Medium","gaps":["Direct binding of GSE1/HDAC1 to the KLF6 promoter was not shown by ChIP","Whether KLF6 re-expression fully rescues the GSE1 depletion phenotype was not tested"]},{"year":null,"claim":"Key unresolved questions include the structural basis for GSE1's scaffolding within the CoREST complex, how GSE1's USP22-anchoring and HDAC1-cooperating functions are partitioned across different biological contexts (DDR, development, oncogenesis), and whether GSE1 has functions independent of the CoREST complex.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of GSE1 or the GSE1–USP22 interface exists","Relative importance of USP22-anchoring versus transcriptional repression in cancer phenotypes is unknown","Whether GSE1 operates outside the CoREST complex has not been addressed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,8]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[5,10]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,5,8]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[1,8]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1,8]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,10]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[8]}],"complexes":["BHC/BRAF-HDAC/CoREST complex","USP22-GSE1-CoREST subcomplex"],"partners":["HDAC1","RCOR1","KDM1A","USP22","HDAC2","GTF2I"],"other_free_text":[]},"mechanistic_narrative":"GSE1 is a chromatin-associated scaffolding protein that functions within the HDAC1/CoREST/BHC (LSD1-containing) co-repressor complex to mediate transcriptional silencing and coordinate the DNA damage response. GSE1 anchors the deubiquitinase USP22 to the CoREST complex, enabling H2B-K120 deubiquitination upon DNA damage without affecting the complex's histone deacetylase activity, and cooperates with HDAC1 to repress target genes including the tumor suppressor KLF6 and immune/cytokine-signaling loci [PMID:37878419, PMID:34862459, PMID:38886911]. GSE1 is required for placental development in mice, where its loss causes embryonic lethality due to deficient syncytiotrophoblast-II differentiation in a placenta-autonomous manner [PMID:37019373]. Overexpression of GSE1 in multiple cancer types promotes proliferation, invasion, and therapy resistance through transcriptional repression of tumor suppressors and modulation of apoptotic gene expression [PMID:26828271, PMID:34439112, PMID:33623790]."},"prefetch_data":{"uniprot":{"accession":"Q14687","full_name":"Genetic suppressor element 1","aliases":[],"length_aa":1217,"mass_kda":136.2,"function":"","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q14687/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GSE1","classification":"Not 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all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GSE1"},"hgnc":{"alias_symbol":[],"prev_symbol":["KIAA0182"]},"alphafold":{"accession":"Q14687","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14687","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14687-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14687-F1-predicted_aligned_error_v6.png","plddt_mean":54.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GSE1","jax_strain_url":"https://www.jax.org/strain/search?query=GSE1"},"sequence":{"accession":"Q14687","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14687.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14687/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14687"}},"corpus_meta":[{"pmid":"26828271","id":"PMC_26828271","title":"GSE1 negative regulation by miR-489-5p promotes breast cancer cell proliferation and invasion.","date":"2016","source":"Biochemical and 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/27705803","citation_count":216,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"29568061","id":"PMC_29568061","title":"An AP-MS- and BioID-compatible MAC-tag enables comprehensive mapping of protein interactions and subcellular localizations.","date":"2018","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/29568061","citation_count":201,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12493763","id":"PMC_12493763","title":"A candidate X-linked mental retardation gene is a component of a new family of histone deacetylase-containing complexes.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12493763","citation_count":156,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"30415952","id":"PMC_30415952","title":"MYC Protein Interactome Profiling Reveals Functionally Distinct Regions that Cooperate to Drive Tumorigenesis.","date":"2018","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/30415952","citation_count":152,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32344865","id":"PMC_32344865","title":"Comparative Application of BioID and TurboID for Protein-Proximity Biotinylation.","date":"2020","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/32344865","citation_count":146,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19322201","id":"PMC_19322201","title":"Ubiquitin-mediated proteolysis of HuR by heat shock.","date":"2009","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/19322201","citation_count":142,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"29117863","id":"PMC_29117863","title":"RNA-binding activity of TRIM25 is mediated by its PRY/SPRY domain and is required for ubiquitination.","date":"2017","source":"BMC biology","url":"https://pubmed.ncbi.nlm.nih.gov/29117863","citation_count":135,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7927,"output_tokens":1862,"usd":0.025856},"stage2":{"model":"claude-opus-4-6","input_tokens":5122,"output_tokens":1935,"usd":0.110978},"total_usd":0.341744,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":19752,"output_tokens":3488,"usd":0.055788},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6293,"output_tokens":2718,"usd":0.149122}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2023,\n      \"finding\": \"GSE1 forms a stable complex with the HDAC1/CoREST co-repressor complex, as identified by affinity purification mass spectrometry. Loss of GSE1 impairs the DNA damage response (DDR), ATR signalling, and γH2AX formation upon DNA damage induction, and alters phosphorylation of ATR target SQ motifs on DDR-related proteins. GSE1 is essential for binding of the deubiquitinase USP22 to CoREST and for deubiquitination of histone H2B K120 in response to DNA damage, forming a USP22-GSE1-CoREST multi-enzymatic eraser complex with deacetylase, demethylase, and deubiquitinase activities.\",\n      \"method\": \"Affinity purification mass spectrometry (AP-MS), phosphoproteomics, GSE1 knockout cells, H2B ubiquitination assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (AP-MS, phosphoproteomics, KO phenotype, histone modification assays) in a single rigorous study\",\n      \"pmids\": [\"37878419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GSE1 interacts with HDAC1 and other BHC (BRAF-HDAC) complex components as shown by immunoprecipitation, and cooperates with HDAC1 to transcriptionally repress the tumor suppressor KLF6 in lung adenocarcinoma cells, promoting proliferation and migration.\",\n      \"method\": \"Co-immunoprecipitation, transcriptome analysis (RNA-seq), qRT-PCR, western blot, siRNA knockdown\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — reciprocal Co-IP plus transcriptomic and functional validation in a single study\",\n      \"pmids\": [\"38886911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LSD1 inhibitors (MC2580, DDP-38003) downregulate GSE1 protein levels, leading to myeloid differentiation of AML cells. LSD1 and GSE1 co-localize at promoters of immune response and cytokine-signaling genes at baseline to enforce transcriptional silencing; LSD1 inhibition reduces GSE1 promoter binding, activating these transcriptional programs.\",\n      \"method\": \"ChIP, LSD1 inhibitor treatment, GSE1 depletion (siRNA/shRNA), in vitro and in vivo tumor assays, gene expression profiling\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP co-localization plus functional genetic depletion with defined transcriptional and differentiation phenotype in a single study\",\n      \"pmids\": [\"34862459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Mouse Gse1 (ortholog) is a component of the CoREST complex that acts as an H3K4 and H3K9 demethylase regulator. Zygotic deletion of Gse1 causes embryonic lethality from E12.5 due to placental defects, specifically loss of MCT4+ syncytiotrophoblast II cells, as demonstrated by placenta-specific conditional deletion using Tat-Cre.\",\n      \"method\": \"Mouse conditional knockout (maternal and zygotic), Cre-lox placenta-specific deletion, histology, gene expression profiling\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype and placenta-specific rescue experiment; mouse ortholog\",\n      \"pmids\": [\"37019373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GSE1 is a direct target of miR-489-5p; forced expression of miR-489-5p suppresses breast cancer cell proliferation, migration, and invasion, and depletion of GSE1 by siRNA abrogates the enhanced oncogenic phenotypes caused by miR-489-5p loss, placing GSE1 downstream of miR-489-5p in this regulatory axis.\",\n      \"method\": \"siRNA knockdown, miRNA overexpression, luciferase reporter assay (implied as direct target), functional proliferation/migration/invasion assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct miRNA-target identification with epistasis rescue experiment; single lab\",\n      \"pmids\": [\"26828271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In HER2-positive gastric cancer cells, GSE1 positively regulates BCL-2 expression, and this GSE1-BCL-2 axis promotes trastuzumab resistance; depletion of GSE1 decreases trastuzumab resistance in acquired-resistant gastric cancer cells.\",\n      \"method\": \"siRNA knockdown, western blot, cell viability assays with trastuzumab\",\n      \"journal\": \"BioMed research international\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 + Weak — single lab, single method set, no direct mechanistic assay for BCL-2 regulation\",\n      \"pmids\": [\"33623790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GSE1 is a direct target mRNA of miR-144-3p, and circ_0001982 acts as a sponge for miR-144-3p to upregulate GSE1 expression in breast cancer, promoting proliferation, glycolysis, migration, and invasion; this was validated by dual-luciferase reporter and RNA immunoprecipitation assays.\",\n      \"method\": \"Dual-luciferase reporter assay, RNA immunoprecipitation, siRNA knockdown, xenograft model\",\n      \"journal\": \"Journal of biochemical and molecular toxicology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 + Weak — single lab, ceRNA axis with limited mechanistic depth on GSE1 itself\",\n      \"pmids\": [\"37867456\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GSE1 is a chromatin-associated scaffold protein that forms a stable complex with the HDAC1/CoREST co-repressor and is essential for recruiting the deubiquitinase USP22 to CoREST, enabling H2B K120 deubiquitination in response to DNA damage; it also cooperates with HDAC1 to transcriptionally silence target genes (including tumor suppressors such as KLF6 and immune/cytokine-response genes), and its activity is regulated post-transcriptionally by miRNAs (miR-489-5p, miR-144-3p) and at the protein level downstream of LSD1 activity.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll first classify each paper, then extract discoveries from KEPT papers only.\n\n**Classification:**\n\nRetrieved papers:\n1. GSE1/miR-489-5p in breast cancer → KEEP\n2. GSE1/LSD1 in AML → KEEP\n3. GSE1/trastuzumab resistance in gastric cancer → KEEP\n4. GSE1/TACSTD2 in prostate cancer → KEEP\n5. GSE1 methylation in atrial fibrillation → EXCLUDE (expression/biomarker only)\n6. GSE1/HDAC1/CoREST/DDR → KEEP\n7. Gse1 mouse placenta development → KEEP\n8. GSE1/HDAC1/KLF6 in lung cancer → KEEP\n9. Circ_0001982/miR-144-3p/GSE1 → KEEP (GSE1 as downstream target)\n10. ASD genetics preprint → EXCLUDE (GWAS/association)\n11. Hypertension multi-omics preprint → EXCLUDE (expression/methylation association)\n\nGene2pubmed curated papers:\n- PMID:16189514, 16169070, 12477932, 15302935, 26186194, 28514442, 26496610, 25416956, 32296183, 33961781, 22939629, 19060904 → Large-scale interactome/proteome studies; GSE1 appears incidentally → EXCLUDE (no mechanistic findings about GSE1 specifically)\n- PMID:16079794 (CoREST/BHC complex, H3K4 demethylation) → KEEP (GSE1 is a component of BHC/CoREST complex)\n- PMID:29395067 → EXCLUDE (GSE1 incidental)\n- PMID:21258344 (HDAC inhibitors/complexes) → KEEP (GSE1/BHC complex component)\n- PMID:15489334, 8889548 → EXCLUDE (cDNA libraries)\n- PMID:26638075, 35271311, 34079125 → EXCLUDE (GSE1 incidental)\n- PMID:32322062 → EXCLUDE (PCK1/INSIG, no GSE1)\n- PMID:23752268 (HDAC interactome) → KEEP (GSE1 in HDAC complexes)\n- PMID:27705803 → EXCLUDE (PcG complexome, GSE1 not specifically discussed)\n- PMID:29568061, 32344865 → EXCLUDE (methodology)\n- PMID:17043677 → EXCLUDE (DISC1 interactome, GSE1 incidental)\n- PMID:19322201 → EXCLUDE (HuR ubiquitination)\n- PMID:29117863 → EXCLUDE (TRIM25)\n- PMID:30415952 → EXCLUDE (MYC interactome)\n- PMID:12493763 (HDAC complexes, X-linked MR gene) → KEEP (GSE1/BHC complex)\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"GSE1 (then described as a candidate X-linked mental retardation gene product) was identified as a component of a novel multiprotein corepressor complex containing HDAC1/2 and BHC110 (LSD1), along with TFII-I; this complex functions to keep genes silent through chromatin structure modification.\",\n      \"method\": \"Biochemical purification of native complexes, mass spectrometry, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and biochemical purification identifying complex composition, foundational study\",\n      \"pmids\": [\"12493763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"GSE1 is a component of the BHC (BRAF-HDAC/CoREST) complex; the CoREST subunit of this complex is essential for LSD1/BHC110-mediated H3K4 demethylation on nucleosomal substrates, placing GSE1 within a multi-subunit chromatin-remodeling and transcriptional repression machinery.\",\n      \"method\": \"In vitro reconstitution of BHC complex from recombinant subunits, nucleosomal demethylation assay, CoREST depletion in cell culture\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with nucleosomal substrate and functional rescue experiments\",\n      \"pmids\": [\"16079794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GSE1 was identified as a scaffolding subunit of the BHC/BRAF-HDAC complex (an ELM-SANT domain-containing HDAC complex), which is selectively targeted by certain HDAC inhibitors (aminobenzamides) with distinct profiles relative to Sin3 and NCoR complexes.\",\n      \"method\": \"Affinity capture of HDAC complexes combined with quantitative mass spectrometry (chemoproteomics)\",\n      \"journal\": \"Nature biotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative AP-MS identifying GSE1 in a specific HDAC complex, single study\",\n      \"pmids\": [\"21258344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GSE1 was confirmed as a component of the HDAC1-containing BHC/CoREST complex in T cells; HDAC1 interactions within chromatin-remodeling complexes including this one are largely stable as measured by quantitative proteomics.\",\n      \"method\": \"Immunoaffinity purification, quantitative mass spectrometry (label-free and SILAC), fluorescence microscopy\",\n      \"journal\": \"Molecular systems biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative proteomics with multiple methods, single study\",\n      \"pmids\": [\"23752268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GSE1 silencing in breast cancer cells significantly suppressed proliferation, migration, and invasion; GSE1 was identified as a direct target of miR-489-5p, and restoration of miR-489-5p phenocopied GSE1 knockdown. Depletion of GSE1 by siRNA abrogated enhanced proliferation and invasion caused by miR-489-5p depletion.\",\n      \"method\": \"siRNA knockdown, miRNA overexpression/depletion, luciferase reporter assay (direct target validation), cell proliferation/migration/invasion assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — loss-of-function with defined phenotype, direct miRNA target validation by reporter assay\",\n      \"pmids\": [\"26828271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GSE1 depletion in AML (NB4) cells caused decreased cell viability in vitro and tumor growth in vivo; LSD1 inhibitors (MC2580, DDP-38003) downregulate GSE1 protein and trigger myeloid differentiation. LSD1 and GSE1 co-localize at promoters of immune response and cytokine-signaling genes, enforcing their transcriptional silencing; LSD1 inhibition reduces GSE1 binding to these promoters, activating transcriptional programs.\",\n      \"method\": \"shRNA/siRNA knockdown, in vivo xenograft, ChIP, gene expression profiling, pharmacological LSD1 inhibition\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP co-localization and gene expression rescue experiments in multiple systems\",\n      \"pmids\": [\"34862459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GSE1 overexpression promotes trastuzumab resistance in HER2-positive gastric cancer cells; BCL-2 was identified as a downstream gene positively regulated by GSE1, and GSE1 depletion decreased trastuzumab resistance.\",\n      \"method\": \"siRNA knockdown, acquired resistance cell line model, western blot, cell viability assays\",\n      \"journal\": \"BioMed research international\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single KD approach with limited mechanistic dissection\",\n      \"pmids\": [\"33623790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"shRNA-mediated GSE1 knockdown in metastatic prostate cancer cells inhibited proliferation, migration, and tumorsphere formation, with suppression of VIM, SNAI2, and BCL2 and upregulation of TACSTD2 and BAX; GSE1 and TACSTD2 show a direct inverse expression relationship driving metastatic disease and castration resistance.\",\n      \"method\": \"shRNA knockdown, in vitro cell assays (proliferation, migration, tumorsphere), in vivo xenograft, multi-omics cohort analysis\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — loss-of-function with defined phenotype and downstream target identification in vitro and in vivo\",\n      \"pmids\": [\"34439112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GSE1 forms a complex with the HDAC1/CoREST co-repressor complex (identified by AP-MS); loss of GSE1 impairs DNA damage response (DDR), ATR signaling, and γH2AX formation. GSE1 is essential for binding of deubiquitinase USP22 to CoREST and for H2B K120 deubiquitination in response to DNA damage; loss of GSE1 does not affect CoREST histone deacetylation activity. Thus GSE1 anchors a USP22-GSE1-CoREST multi-enzymatic eraser subcomplex.\",\n      \"method\": \"Affinity purification mass spectrometry (AP-MS), phosphoproteomics/phosphorylome analysis, CRISPR knockout, in vivo DNA damage assays (γH2AX, ATR-SQ motif analysis), deubiquitination assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — AP-MS complex identification + phosphoproteomics + KO phenotype + enzymatic assay, multiple orthogonal methods\",\n      \"pmids\": [\"37878419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Gse1 is required for mouse placental development; zygotic deletion causes embryonic lethality from E12.5 and maternal deletion increases prenatal death. Gse1 mutant placentas are deficient in MCT4+ syncytiotrophoblast II from E14.5, and placenta-specific deletion recapitulates embryonic defects, demonstrating a placenta-autonomous role for Gse1.\",\n      \"method\": \"Conditional and germline knockout mice, placenta-specific Cre-mediated deletion, histological analysis, gene expression profiling (single-cell level), immunofluorescence\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic deletion models with defined cellular and developmental phenotypes, tissue-specific rescue\",\n      \"pmids\": [\"37019373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GSE1 interacts with HDAC1 and other BHC (BRAF-HDAC) complex components in lung adenocarcinoma cells; GSE1 cooperates with HDAC1 to suppress transcription of the tumor suppressor KLF6, thereby promoting proliferation and migration of non-small cell lung cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, RNA-seq (transcriptome of GSE1-knockdown cells), qRT-PCR, western blot, bioinformatics (HDAC1 binding site analysis), siRNA knockdown\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP confirming complex membership, transcriptome + target validation by qRT-PCR/western blot\",\n      \"pmids\": [\"38886911\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GSE1 is a chromatin-associated scaffolding protein that is an integral component of the HDAC1/CoREST/BHC (LSD1-containing) co-repressor complex, where it anchors the deubiquitinase USP22 to enable H2B-K120 deubiquitination during the DNA damage response, cooperates with HDAC1 to silence target genes (including KLF6 and immune/cytokine-pathway genes), and is required for mouse placental development; its overexpression in multiple cancers (breast, lung, gastric, prostate, AML) drives proliferation, invasion, therapy resistance, and blocks differentiation through transcriptional repression of tumor suppressors and anti-apoptotic gene regulation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GSE1 is a chromatin-associated scaffold protein that functions within the CoREST/HDAC1 co-repressor machinery to coordinate histone deacetylation, demethylation, and deubiquitination at target gene promoters. GSE1 forms a stable complex with HDAC1 and CoREST and is essential for recruiting the deubiquitinase USP22 to this complex, enabling H2B K120 deubiquitination in response to DNA damage and supporting ATR signaling and γH2AX formation [PMID:37878419]. Beyond the DNA damage response, GSE1 cooperates with HDAC1 to transcriptionally repress tumor suppressor genes such as KLF6 in lung adenocarcinoma and co-localizes with LSD1 at promoters of immune-response and cytokine-signaling genes to enforce their silencing in AML cells [PMID:38886911, PMID:34862459]. In mice, zygotic deletion of the ortholog Gse1 causes embryonic lethality due to placental defects, specifically loss of syncytiotrophoblast II cells, demonstrating an essential developmental role [PMID:37019373].\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"The first functional link between GSE1 and cell proliferation/invasion was established when GSE1 was identified as a direct miR-489-5p target whose depletion suppressed breast cancer oncogenic phenotypes, framing GSE1 as a pro-proliferative factor.\",\n      \"evidence\": \"miRNA overexpression, luciferase reporter assay, and epistasis rescue by siRNA in breast cancer cells\",\n      \"pmids\": [\"26828271\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No chromatin or transcriptional mechanism for GSE1 was identified\",\n        \"Single cancer model without biochemical characterization of GSE1 protein function\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"GSE1 was placed mechanistically within the LSD1/CoREST chromatin axis when LSD1 inhibition was shown to downregulate GSE1 protein and release GSE1 from promoters of immune-response genes, activating these programs and driving myeloid differentiation in AML — establishing GSE1 as an LSD1-dependent transcriptional co-repressor.\",\n      \"evidence\": \"ChIP, LSD1 inhibitor treatment, siRNA/shRNA depletion, gene expression profiling, and in vivo tumor assays in AML cells\",\n      \"pmids\": [\"34862459\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between GSE1 and LSD1 was not demonstrated by reciprocal pulldown\",\n        \"Whether GSE1 regulation by LSD1 is transcriptional or post-translational was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The core biochemical function of GSE1 was defined when AP-MS and knockout studies showed it forms a stable complex with HDAC1/CoREST and is required to recruit USP22 to this complex, enabling H2B K120 deubiquitination during the DNA damage response — establishing a multi-enzymatic eraser complex with deacetylase, demethylase, and deubiquitinase activities.\",\n      \"evidence\": \"Affinity purification mass spectrometry, phosphoproteomics, GSE1 knockout cells, and histone ubiquitination assays\",\n      \"pmids\": [\"37878419\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for how GSE1 bridges USP22 and CoREST is unknown\",\n        \"Whether USP22 recruitment by GSE1 is relevant outside the DDR context has not been tested\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"An essential developmental role for GSE1 was established when mouse Gse1 knockout caused embryonic lethality from E12.5 due to loss of MCT4+ syncytiotrophoblast II cells, confirming in vivo requirement and linking CoREST complex function to placental morphogenesis.\",\n      \"evidence\": \"Mouse conditional knockout, Cre-lox placenta-specific deletion, histology, and gene expression profiling\",\n      \"pmids\": [\"37019373\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether specific chromatin targets of Gse1 in trophoblast differentiation are shared with its cancer-related targets is unknown\",\n        \"Human GSE1 mutations in placental or developmental disease have not been reported\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"GSE1's cooperation with HDAC1 was extended to a specific transcriptional target when GSE1-HDAC1 interaction was shown to repress the tumor suppressor KLF6 in lung adenocarcinoma, mechanistically linking the co-repressor complex to a defined downstream gene that controls proliferation and migration.\",\n      \"evidence\": \"Co-immunoprecipitation, RNA-seq, qRT-PCR, western blot, and siRNA knockdown in lung adenocarcinoma cells\",\n      \"pmids\": [\"38886911\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct GSE1 occupancy at the KLF6 promoter was not shown by ChIP\",\n        \"Whether KLF6 repression depends on USP22 recruitment or only on HDAC1 activity is unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of GSE1's scaffolding within the USP22–CoREST complex, the full repertoire of its direct chromatin targets across cell types, and whether its DDR and transcriptional co-repressor functions are separable remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural or cryo-EM model of the USP22–GSE1–CoREST complex exists\",\n        \"Genome-wide direct binding targets of GSE1 across normal and cancer contexts are not catalogued\",\n        \"Whether GSE1's role in DDR (USP22 recruitment, H2Bub deubiquitination) is mechanistically separable from its transcriptional silencing function is untested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [\n      \"CoREST complex\",\n      \"BHC (BRAF-HDAC) complex\"\n    ],\n    \"partners\": [\n      \"HDAC1\",\n      \"USP22\",\n      \"LSD1\",\n      \"RCOR1\",\n      \"KLF6\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"GSE1 is a chromatin-associated scaffolding protein that functions within the HDAC1/CoREST/BHC (LSD1-containing) co-repressor complex to mediate transcriptional silencing and coordinate the DNA damage response. GSE1 anchors the deubiquitinase USP22 to the CoREST complex, enabling H2B-K120 deubiquitination upon DNA damage without affecting the complex's histone deacetylase activity, and cooperates with HDAC1 to repress target genes including the tumor suppressor KLF6 and immune/cytokine-signaling loci [PMID:37878419, PMID:34862459, PMID:38886911]. GSE1 is required for placental development in mice, where its loss causes embryonic lethality due to deficient syncytiotrophoblast-II differentiation in a placenta-autonomous manner [PMID:37019373]. Overexpression of GSE1 in multiple cancer types promotes proliferation, invasion, and therapy resistance through transcriptional repression of tumor suppressors and modulation of apoptotic gene expression [PMID:26828271, PMID:34439112, PMID:33623790].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing GSE1 as a subunit of a novel HDAC1/2-containing co-repressor complex (BHC/CoREST) resolved its molecular context and linked it to chromatin-mediated gene silencing.\",\n      \"evidence\": \"Biochemical purification and mass spectrometry of native HDAC-containing complexes, with reciprocal co-immunoprecipitation\",\n      \"pmids\": [\"12493763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct contribution of GSE1 to complex activity was not tested\",\n        \"Whether GSE1 contacts DNA or histones directly was unknown\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating that CoREST is required for LSD1-mediated nucleosomal H3K4 demethylation placed the BHC complex — and GSE1 within it — in a defined enzymatic pathway of transcriptional repression on chromatin substrates.\",\n      \"evidence\": \"In vitro reconstitution of BHC complex with recombinant subunits and nucleosomal demethylation assays\",\n      \"pmids\": [\"16079794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"GSE1's specific role within the complex during demethylation was not dissected\",\n        \"Genomic targets of the complex in vivo were not identified\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Chemoproteomic profiling confirmed GSE1 as a scaffolding subunit specifically of the BHC/BRAF-HDAC complex, distinguishing it from Sin3 and NCoR complexes, and revealed that certain HDAC inhibitors selectively target this complex.\",\n      \"evidence\": \"Affinity capture of HDAC complexes combined with quantitative mass spectrometry\",\n      \"pmids\": [\"21258344\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether GSE1 mediates pharmacological selectivity was not tested\",\n        \"No functional assay for GSE1 loss was performed\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Loss-of-function studies in breast cancer cells established GSE1 as an oncogenic effector, showing that its silencing suppresses proliferation, migration, and invasion, and identifying GSE1 as a direct target of the tumor-suppressive miR-489-5p.\",\n      \"evidence\": \"siRNA knockdown, miRNA overexpression/depletion, luciferase reporter assay for direct target validation, cell proliferation/migration/invasion assays\",\n      \"pmids\": [\"26828271\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which GSE1 drives pro-invasive transcription was not defined\",\n        \"In vivo validation was not performed\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"ChIP and pharmacological studies in AML cells showed that GSE1 co-localizes with LSD1 at promoters of immune-response and cytokine-signaling genes to enforce their silencing; LSD1 inhibition reduces GSE1 promoter occupancy and triggers myeloid differentiation, linking GSE1 to differentiation blockade in leukemia.\",\n      \"evidence\": \"ChIP, gene expression profiling, shRNA/siRNA knockdown, in vivo xenograft, pharmacological LSD1 inhibition with MC2580/DDP-38003\",\n      \"pmids\": [\"34862459\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether GSE1 recruitment depends on LSD1 catalytic activity or protein–protein interaction was not resolved\",\n        \"Direct DNA-binding capacity of GSE1 was not addressed\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Studies in prostate and gastric cancer extended GSE1's pro-tumorigenic role by showing that its depletion suppresses EMT markers, BCL2, and tumorsphere formation while upregulating pro-apoptotic and epithelial genes, implicating GSE1 in therapy resistance and metastatic progression.\",\n      \"evidence\": \"shRNA knockdown, in vitro proliferation/migration/tumorsphere assays, in vivo xenograft, western blot, multi-omics cohort analysis\",\n      \"pmids\": [\"34439112\", \"33623790\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Trastuzumab resistance mechanism via BCL-2 relied on a single knockdown approach without chromatin-level data\",\n        \"Whether GSE1 directly regulates BCL2 transcription or acts indirectly was not determined\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defining GSE1 as the anchor that recruits USP22 to the CoREST complex resolved its unique mechanistic contribution: GSE1 is dispensable for HDAC activity but essential for H2B-K120 deubiquitination and a functional DNA damage response, establishing a multi-enzymatic eraser subcomplex (USP22–GSE1–CoREST).\",\n      \"evidence\": \"AP-MS, CRISPR knockout, phosphoproteomics, γH2AX and ATR-SQ motif analysis, in vitro deubiquitination assays\",\n      \"pmids\": [\"37878419\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for GSE1–USP22 interaction is unknown\",\n        \"Whether GSE1's DDR role is relevant in vivo (animal models) has not been tested\",\n        \"Contribution of USP22 anchoring versus other GSE1 functions to cancer phenotypes is not disentangled\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Genetic deletion in mice revealed that Gse1 is essential for placental development, specifically for syncytiotrophoblast-II differentiation, demonstrating a physiological developmental role beyond cancer contexts.\",\n      \"evidence\": \"Conditional and germline knockout mice, placenta-specific Cre-mediated deletion, single-cell gene expression profiling, immunofluorescence\",\n      \"pmids\": [\"37019373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Downstream transcriptional targets mediating syncytiotrophoblast-II failure are not fully characterized\",\n        \"Whether the placental phenotype depends on CoREST complex function or a GSE1-autonomous mechanism is unclear\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Transcriptomic analysis of GSE1-depleted lung adenocarcinoma cells identified KLF6 as a key tumor-suppressor target co-repressed by GSE1 and HDAC1, providing a specific gene-level mechanism for GSE1-driven proliferation.\",\n      \"evidence\": \"Co-immunoprecipitation, RNA-seq, qRT-PCR, western blot, siRNA knockdown in NSCLC cells\",\n      \"pmids\": [\"38886911\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct binding of GSE1/HDAC1 to the KLF6 promoter was not shown by ChIP\",\n        \"Whether KLF6 re-expression fully rescues the GSE1 depletion phenotype was not tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for GSE1's scaffolding within the CoREST complex, how GSE1's USP22-anchoring and HDAC1-cooperating functions are partitioned across different biological contexts (DDR, development, oncogenesis), and whether GSE1 has functions independent of the CoREST complex.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of GSE1 or the GSE1–USP22 interface exists\",\n        \"Relative importance of USP22-anchoring versus transcriptional repression in cancer phenotypes is unknown\",\n        \"Whether GSE1 operates outside the CoREST complex has not been addressed\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 8]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [5, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 5, 8]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 10]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\n      \"BHC/BRAF-HDAC/CoREST complex\",\n      \"USP22-GSE1-CoREST subcomplex\"\n    ],\n    \"partners\": [\n      \"HDAC1\",\n      \"RCOR1\",\n      \"KDM1A\",\n      \"USP22\",\n      \"HDAC2\",\n      \"GTF2I\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}