{"gene":"SMARCA4","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":1993,"finding":"BRG1 encodes a 205 kDa nuclear protein containing a DNA-dependent ATPase domain homologous to SWI2/SNF2; a SWI2/BRG1 chimera with the ATPase domain replaced by human sequence rescued mitotic growth and transcriptional activation in swi2- yeast, while point mutation of the conserved ATP-binding lysine abolished complementation and exerted a dominant-negative effect; the same lysine-to-arginine substitution in BRG1 generated a transcriptional dominant negative in human cells.","method":"Yeast complementation, site-directed mutagenesis, dominant-negative overexpression in human cells","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — functional reconstitution with mutagenesis in two organisms","pmids":["8232556"],"is_preprint":false},{"year":1994,"finding":"BRG1 physically interacts with the retinoblastoma protein (RB) via a conserved RB-binding motif; the interaction requires the hypophosphorylated form of RB and the A/B pocket; BRG1-RB cooperation is required for BRG1-induced growth arrest (flat cell formation) in SW13 carcinoma cells, and sequestration of RB by adenovirus E1A or mutation of the RB-binding motif in BRG1 abolishes this activity.","method":"Yeast two-hybrid, co-immunoprecipitation, dominant-negative BRG1 expression, functional rescue assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 — reciprocal co-IP plus functional epistasis, foundational paper with high citations","pmids":["7923370"],"is_preprint":false},{"year":1996,"finding":"BRG1 was purified as part of a mammalian SWI/SNF complex of 9–12 proteins (BRG1-associated factors, BAFs); the BRG1 complex can disrupt nucleosomes and facilitate binding of GAL4-VP16 to nucleosomal templates in vitro; BRG1 and hBRM are present in separate, distinct complexes with heterogeneous subunit compositions across cell types.","method":"Affinity purification, microsequencing, in vitro nucleosome disruption assay, GAL4-VP16 chromatin binding assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — biochemical reconstitution with nucleosome disruption assay, foundational complex characterization","pmids":["8895581"],"is_preprint":false},{"year":1996,"finding":"The mammalian SWI/SNF complex exists in multiple forms with distinct subunit compositions; BAF60b is found in a complex that shares some but not all subunits with the BRG1 complex; tissue-specific BAF subunits (BAF60b in muscle, BAF60c in pancreas) diversify the complex for developmental functions.","method":"Affinity purification, cDNA cloning, co-immunoprecipitation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — MS/sequencing combined with co-IP, replicated across multiple cell lines","pmids":["8804307"],"is_preprint":false},{"year":1998,"finding":"Antigen receptor signaling induces rapid association of the BRG1-containing BAF complex with chromatin; phosphatidylinositol 4,5-bisphosphate (PIP2) is sufficient in vitro to target the BAF complex to chromatin but has no effect on related complexes containing SNF2L/hISWI; β-actin and BAF53 (actin-related protein) are subunits of the BAF complex required for maximal BRG1 ATPase activity and for chromatin/matrix association.","method":"Biochemical fractionation, in vitro chromatin-targeting assay with PIP2, peptide sequencing, ATPase assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with ATPase assay plus functional specificity demonstrated","pmids":["9845365"],"is_preprint":false},{"year":1999,"finding":"Both BRG1 and hBRM, as purified proteins, are capable of remodeling mono-nucleosomes and nucleosomal arrays in an ATP-dependent manner; addition of INI1, BAF155, and BAF170 to BRG1 increases remodeling activity to levels comparable to the whole hSWI/SNF complex, defining the functional core.","method":"In vitro nucleosome remodeling reconstitution with purified recombinant subunits","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with defined subunit combinations","pmids":["10078207"],"is_preprint":false},{"year":2000,"finding":"RB forms a repressor complex containing HDAC and the hSWI/SNF (BRG1-containing) nucleosome remodeling complex that inhibits transcription of cyclins E and A; phosphorylation of RB by cyclin D/CDK4 disrupts the HDAC association but the Rb-hSWI/SNF complex persists and maintains repression of cyclin A and CDC2 genes, controlling exit from S phase.","method":"Co-immunoprecipitation, chromatin immunoprecipitation, reporter assays, dominant-negative BRG1","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — co-IP with functional epistasis, replicated findings on RB-BRG1 axis","pmids":["10778858"],"is_preprint":false},{"year":2000,"finding":"BRCA1 directly interacts with the BRG1 subunit of a SWI/SNF-related complex isolated from human cells; this complex displays chromatin-remodeling activity; p53-mediated transcriptional stimulation by BRCA1 is abrogated by dominant-negative BRG1 or by the cancer-causing BRCA1 exon 11 deletion.","method":"Affinity/conventional chromatography, mass spectrometry, direct binding assay, dominant-negative functional assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 — purified complex characterization with direct binding and functional epistasis","pmids":["10943845"],"is_preprint":false},{"year":2001,"finding":"BRG1 fractionates into two biochemically distinct complexes (differing in activity and subunit composition), while hBRM forms one complex with lower remodeling activity; one BRG1 complex and the hBRM complex contain components of the mSin3 repressor complex; BRG1, hBRM, and BAF155 directly interact with mSin3A in vitro, linking hSWI/SNF complexes to gene repression.","method":"Epitope-tag affinity purification, nucleosome remodeling assay, restriction enzyme accessibility assay, ATPase assay, in vitro pulldown","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 — in vitro remodeling assays plus direct binding, multiple orthogonal methods","pmids":["11238380"],"is_preprint":false},{"year":2001,"finding":"LKB1 (STK11) physically associates with BRG1 via LKB1's N-terminus and BRG1's helicase domain; LKB1 stimulates BRG1 ATPase activity; expression of kinase-dead LKB1 (SL26) blocks BRG1-dependent growth arrest (flat cell formation) in SW13 cells, indicating LKB1 is required for BRG1-mediated growth arrest.","method":"Co-immunoprecipitation, in vitro pulldown, ATPase assay, dominant-negative functional assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — direct binding with ATPase stimulation assay plus functional epistasis","pmids":["11445556"],"is_preprint":false},{"year":2002,"finding":"hELD/OSA1 (ARID1A homolog) is a BRG1-interacting protein; the EHD2 domain of hELD/OSA1 mediates direct binding to BRG1; hELD/OSA1 is present in endogenous SWI/SNF complexes from mouse brain.","method":"cDNA cloning, co-immunoprecipitation, in vitro binding domain mapping","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 3 — single pulldown/co-IP with domain mapping","pmids":["11988099"],"is_preprint":false},{"year":2004,"finding":"BRG1 reintroduction into BRG1-mutant breast tumor cells (ALAB) induced growth arrest associated with up-regulation of CDK inhibitors p21 and p15 and down-regulation of E2F targets (cyclin E); p21 protein was recruited to a complex with CDK2 inhibiting its activity; BRG1 associates with the p21 promoter in a p53-independent manner.","method":"Cell line rescue (BRG1 reintroduction), chromatin immunoprecipitation, CDK2 kinase assay, co-immunoprecipitation, microarray/real-time PCR","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in defined mutant cell line model","pmids":["14673169"],"is_preprint":false},{"year":2004,"finding":"STAT3 associates with BRG1 by co-immunoprecipitation and pulldown; STAT3 DNA binding recruits BRG1 to the p21waf1 promoter, resulting in histone H3 acetylation and increased chromatin accessibility; BRG1 loading is followed by RNA polymerase II association and subsequent CDK9-mediated Ser2 phosphorylation of the CTD, enabling transcription elongation.","method":"Co-immunoprecipitation, pulldown, chromatin immunoprecipitation, restriction enzyme accessibility (Southern blot)","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 — co-IP plus ChIP with functional accessibility assay, single lab","pmids":["15286705"],"is_preprint":false},{"year":2006,"finding":"BRG1-mediated activation of the CSF1 gene results in Z-DNA formation at a TG repeat within the promoter; BRG1 disrupts a positioned nucleosome at the silent CSF1 promoter; both BRG1 activity and Z-DNA formation are required for effective chromatin remodeling, with Z-DNA promoting the transition from transient to extensive nucleosome disruption.","method":"Chromatin immunoprecipitation, nucleosome mapping, Z-DNA specific antibody staining, reporter assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP combined with nucleosome positioning and functional reporter, single lab","pmids":["16537901"],"is_preprint":false},{"year":2009,"finding":"TERT (telomerase reverse transcriptase) interacts with BRG1 and activates Wnt-dependent reporters; TERT physically occupies promoters of Wnt-dependent genes in vivo; TERT-BRG1 interaction places BRG1 as a cofactor in a β-catenin transcriptional complex modulating the Wnt/β-catenin signaling pathway.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), luciferase reporter assay, Xenopus embryo knockdown, mouse knockout","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP plus ChIP plus in vivo genetic models","pmids":["19571879"],"is_preprint":false},{"year":2009,"finding":"ES cells express a specialized esBAF complex defined by the presence of BRG1 (not BRM), BAF155 (not BAF170), and BAF60A (not BAF60C); this specific subunit composition is required for ES cell self-renewal and pluripotency; esBAF directly interacts with key pluripotency regulators.","method":"Quantitative proteomics, conditional knockout in ES cells, co-immunoprecipitation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — proteomic identification plus genetic loss-of-function with defined cellular phenotype","pmids":["19279220"],"is_preprint":false},{"year":2011,"finding":"BRG1 deletion from embryonic blood vessel endothelium results in down-regulation of Frizzled Wnt receptors, degradation of β-catenin, and decreased Wnt signaling; pharmacological β-catenin stabilization substantially rescues BRG1 mutant vascular phenotypes; BRG1 regulates canonical Wnt signaling at two levels — transcription of Wnt receptor genes and Wnt target genes.","method":"Conditional knockout mouse, pharmacological rescue, qRT-PCR, chromatin immunoprecipitation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in vivo with pharmacological rescue","pmids":["21262838"],"is_preprint":false},{"year":2013,"finding":"BRG1 promotes venous endothelial identity by binding conserved regulatory elements within the COUP-TFII promoter and remodeling chromatin to make it accessible to transcriptional machinery; conditional Brg1 deletion from vascular endothelium downregulates COUP-TFII and causes aberrant arterial marker expression on veins.","method":"Conditional knockout mouse, chromatin immunoprecipitation, chromatin accessibility assay","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic deletion with ChIP-based mechanistic evidence","pmids":["23406903"],"is_preprint":false},{"year":2014,"finding":"SMARCA4/BRG1 binding in embryonic mouse tissues is predominantly distal from promoters and largely tissue-specific (73% of distal sites confined to one or few tissues); SMARCA4 associates with both active (H3K27ac) and repressive (H3K27me3) chromatin states at distal regulatory elements, indicating dual activating/repressive functions at enhancers in vivo.","method":"ChIP-seq with FLAG knock-in mouse, histone modification ChIP-seq, transgenic enhancer assays","journal":"Genome research","confidence":"High","confidence_rationale":"Tier 2 — genome-wide ChIP-seq with in vivo enhancer validation","pmids":["24752179"],"is_preprint":false},{"year":2015,"finding":"BRG1 directly interacts with DLX1 and the lncRNA Evf2 through distinct binding sites; Evf2 directly inhibits BRG1 ATPase and chromatin remodeling activities in vitro; in the developing forebrain, Evf2 colocalizes with BRG1, increases BRG1 association with enhancers, yet converts active enhancers to repressed enhancers by inhibiting chromatin remodeling; mutations causing Coffin-Siris syndrome localize to the RNA-binding and DLX1-binding domains of BRG1.","method":"Mass spectrometry, co-immunoprecipitation, in vitro ATPase assay, in vitro chromatin remodeling assay, ChIP, live-cell imaging","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1 — in vitro ATPase/remodeling assay plus co-IP and ChIP with multiple orthogonal methods","pmids":["26138476"],"is_preprint":false},{"year":2016,"finding":"Zebrafish Brg1 is essential for adult heart regeneration; injury-induced Brg1 interacts with Dnmt3ab and suppresses expression of cdkn1c by increasing CpG methylation at its promoter, thereby repressing CDK inhibitor expression and enabling myocardial proliferation.","method":"Transgenic dominant-negative Brg1 overexpression, co-immunoprecipitation, bisulfite sequencing, RNA-seq, RNAscope","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — co-IP with mechanistic functional readout (methylation, proliferation) in vivo","pmids":["27929112"],"is_preprint":false},{"year":2016,"finding":"SMARCA4/Brg1 coordinates Shh-type medulloblastoma transcriptional program by interacting with Gli1, Atoh1, and REST; Brg1 modulates the activity of H3K27me3 modifiers (Polycomb) to regulate medulloblastoma gene expression; Brg1 deletion inhibits tumor formation and progression in a mouse Shh-MB model.","method":"Conditional knockout mouse model, genome-wide expression profiling, ChIP, co-immunoprecipitation","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic model combined with ChIP and co-IP","pmids":["27065321"],"is_preprint":false},{"year":2017,"finding":"The BRG1 bromodomain (BRD) has moderate specificity for H3K14ac and unexpectedly also binds DNA through a basic patch surface; the BRD and adjacent AT-hook make multivalent contacts with DNA with moderate specificity for AT-rich elements; BRD can bind DNA and H3K14ac simultaneously, but DNA rather than histone binding drives nucleosome association in vitro, while neither contributes to global chromatin affinity of BRG1 in mouse ES cells.","method":"NMR, ITC, fluorescence polarization, in vitro nucleosome binding assay, ChIP-seq in mouse ES cells","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — structural NMR plus in vitro binding assays plus in vivo ChIP-seq","pmids":["28706277"],"is_preprint":false},{"year":2017,"finding":"SMARCA4 cancer missense mutations target conserved ATPase surfaces and disrupt the mechanochemical remodeling cycle; heterozygous expression of these dominant-negative mutants alters open chromatin at thousands of genomic sites, specifically depleting accessibility at active enhancers (losing H3K27ac) predominantly in A compartments; this correlates with pro-oncogenic transcriptional changes including increased MYC expression.","method":"Biochemical ATPase assay, ATAC-seq, ChIP-seq, RNA-seq, dominant-negative mutant cell lines","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1–2 — ATPase disruption biochemistry plus genome-wide chromatin assays, multiple orthogonal methods","pmids":["29323272"],"is_preprint":false},{"year":2018,"finding":"BRG1 is a ubiquitin substrate of SCF-FBW7; CK1δ phosphorylates BRG1 at Ser31/Ser35, facilitating FBW7 binding and subsequent ubiquitination-mediated degradation; stabilization of BRG1 in gastric cancer cells suppresses E-cadherin expression and promotes metastasis.","method":"Co-immunoprecipitation, in vitro kinase assay, ubiquitination assay, site-directed mutagenesis, cell migration/invasion assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro kinase assay and ubiquitination assay with mutagenesis","pmids":["30177679"],"is_preprint":false},{"year":2018,"finding":"BRG1 is required for proper glucocorticoid receptor (GR) transcriptional response in breast cancer cells; BRG1 pre-occupies GR binding sites prior to hormone exposure; BRG1 knockdown blocks recruitment of pioneer factors FOXA1 and GATA3 to GR binding sites, and GR interaction with FOXA1/GATA3 sites is restricted to BRG1 pre-bound loci.","method":"ChIP-seq, siRNA knockdown, hormone treatment, ATAC-seq","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — genome-wide ChIP-seq with functional siRNA knockdown revealing pioneer factor epistasis","pmids":["29792595"],"is_preprint":false},{"year":2018,"finding":"Brg1 interacts with β-catenin to potentiate Wnt signaling in hepatocytes; Brg1 recruits lysine demethylase 4 (KDM4) to activate β-catenin target genes; hepatocyte-specific Brg1 deletion compromises liver regeneration and dampens survival after partial hepatectomy.","method":"Hepatocyte-specific conditional knockout, co-immunoprecipitation, ChIP, partial hepatectomy model","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus ChIP plus in vivo model, single lab","pmids":["30001167"],"is_preprint":false},{"year":2018,"finding":"BRG1 binds to Sox9 promoter regulatory regions and is critical for SOX9 expression in acinar cells; BRG1 recruits upstream regulators PDX1 to the Sox9 promoter and enhancer; BRG1/SOX9 axis is required for acinar-to-ductal metaplasia and PanIN formation in Kras-driven pancreatic tumorigenesis.","method":"Conditional knockout mouse (Ptf1a-CreER; KrasG12D; Brg1fl/fl), ChIP, Sox9 rescue overexpression, organoid assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic model with ChIP and epistasis rescue experiment","pmids":["30010625"],"is_preprint":false},{"year":2019,"finding":"BRG1 loss in prostate cancer cells is synthetically lethal with PTEN loss; PTEN loss stabilizes BRG1 protein through inhibition of the AKT/GSK3β/FBXW7 degradation axis; increased BRG1 in PTEN-deficient cells drives a protumorigenic chromatin configuration causing BRG1 addiction.","method":"Genetically engineered mice, organoid assays, co-immunoprecipitation, western blotting, pharmacological BRG1 inhibitor","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic models with mechanistic pathway dissection using multiple orthogonal approaches","pmids":["30496141"],"is_preprint":false},{"year":2019,"finding":"Xist lncRNA directly interacts with BRG1 in vitro and in cell culture; RNA binding inhibits BRG1 nucleosome-remodeling and ATPase activities in vitro; Xist expels BRG1 from the inactive X chromosome (Xi), and Xist deletion leads to selective return of BRG1 to the Xi correlating with cohesin binding, TAD restoration, and de novo superloop formation.","method":"In vitro ATPase assay, in vitro remodeling assay, RNA immunoprecipitation, ATAC-seq, Hi-C/ChIP-seq","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro ATPase/remodeling assay plus genome-wide chromatin analyses","pmids":["30664740"],"is_preprint":false},{"year":2019,"finding":"BRG1 interacts with RORγ to be recruited to the Elovl3 promoter; BRG1 interacts with histone acetyltransferase p300 at the Elovl3 promoter to activate transcription; BRG1 knockdown attenuates prostate cancer cell migration and invasion concomitant with Elovl3 down-regulation.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, migration/invasion assay","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"Medium","confidence_rationale":"Tier 2–3 — co-IP with ChIP, single lab","pmids":["31154107"],"is_preprint":false},{"year":2020,"finding":"BRG1 deletion in lung cancer leads to replication stress with increased origin firing mediated by CDC6; BRG1-containing SWI/SNF complexes interact with RPA complexes as shown by quantitative mass spectrometry and co-immunoprecipitation; BRG1-deficient lung cancers are selectively sensitive to ATR inhibition.","method":"Gain/loss-of-function genetic approaches, single-molecule replication fork analysis, quantitative mass spectrometry, co-immunoprecipitation, pharmacological ATR inhibition","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — single-molecule replication analysis plus MS interactome plus functional pharmacological epistasis","pmids":["32690724"],"is_preprint":false},{"year":2021,"finding":"Neuronal stimulation induces a CaMKII-sensitive serine phosphorylation of BRG1; phosphorylation alters BRG1 interactions with the NuRD repressor complex and cohesin; non-phosphorylatable BRG1 (knockin) fails to efficiently induce activity-dependent genes, while phosphomimic BRG1 increases enhancer activity; these mutant mice display anxiety-like phenotypes.","method":"Site-directed mutagenesis knockin mice, co-immunoprecipitation, ChIP-seq, RNA-seq, behavioral testing","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — knockin mutagenesis in vivo with co-IP and genome-wide ChIP-seq","pmids":["34260936"],"is_preprint":false},{"year":2021,"finding":"SMARCA4-mutant cells show impaired transactivation and significantly reduced levels of histone demethylases KDM6A/UTX and KDM6B/JMJD3, with aberrant accumulation of H3K27me3; SMARCA4-mutant cells are highly dependent on these demethylases for viability, and KDM6 inhibition (GSK-J4) has strong antitumor effects in orthotopic SMARCA4-mutant lung cancer and SCCOHT models.","method":"Western blotting, pharmacological KDM6 inhibition (GSK-J4), orthotopic xenograft models, histone modification profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — mechanistic in vitro characterization validated in multiple in vivo models","pmids":["34262032"],"is_preprint":false},{"year":2022,"finding":"SMARCA4 colocalizes with SOX10 at gene regulatory elements in diffuse midline glioma (DMG) cells; SMARCA4 chromatin binding is reduced upon depletion of SOX10 or the H3.3K27M mutation; SMARCA4 occupancy at H3K27ac+SOX10 enhancers is most reduced upon depleting H3.3K27M, indicating H3.3K27M epigenome reprogramming creates a dependency on SMARCA4 for gene expression.","method":"ChIP-seq, siRNA depletion, patient-derived xenograft models, loss-of-function genetic approaches","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 — genome-wide ChIP-seq with genetic depletion and in vivo xenograft validation","pmids":["36305747"],"is_preprint":false},{"year":2022,"finding":"OTUD6A deubiquitinase stabilizes BRG1 by erasing K27-linked polyubiquitination on BRG1 (and K11-linked polyubiquitination on AR); identified via mass spectrometry screening; OTUD6A is required for prostate cancer cell progression, and OTUD6A oligonucleotides suppress tumorigenesis in vivo.","method":"Mass spectrometry screening, co-immunoprecipitation, ubiquitination assay, in vivo xenograft/PDX models","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 — MS identification with ubiquitination assay and in vivo validation","pmids":["35233061"],"is_preprint":false},{"year":2023,"finding":"SMARCA4/2 loss represses GLUT1 expression, reducing glucose uptake and glycolysis while increasing dependency on oxidative phosphorylation; these cells upregulate SLC38A2 to import glutamine for fueling OXPHOS; alanine supplementation competes with glutamine for SLC38A2 import and selectively induces death in SMARCA4/2-deficient cancer cells, synergizing with OXPHOS inhibitors.","method":"CRISPR knockout, metabolic flux assays, glucose uptake assay, RNA-seq, patient-derived xenografts, alanine supplementation experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with metabolic mechanistic assays and in vivo validation","pmids":["37210563"],"is_preprint":false}],"current_model":"SMARCA4/BRG1 is the catalytic ATPase subunit of mammalian SWI/SNF (BAF/PBAF) chromatin-remodeling complexes that couples ATP hydrolysis to nucleosome displacement and DNA translocation; it physically interacts with RB, BRCA1, STAT3, LKB1, β-catenin, TERT, RPA complexes, and pioneer transcription factors to regulate cell cycle progression, DNA replication stress responses, enhancer accessibility, Wnt/β-catenin and Wnt-vascular signaling, pluripotency, and tissue-specific gene programs; its activity is regulated post-translationally by CK1δ/FBW7-mediated ubiquitin-proteasomal degradation, OTUD6A-mediated deubiquitination, CaMKII-induced phosphorylation, and direct inhibition by lncRNAs (Xist, Evf2), and its inactivation in cancer causes replication stress, aberrant H3K27me3 accumulation, and metabolic reprogramming toward glutamine/OXPHOS dependency."},"narrative":{"teleology":[{"year":1993,"claim":"Establishing BRG1 as a functional SWI2/SNF2 ATPase homolog answered whether mammals possess a catalytic chromatin-remodeling enzyme equivalent to yeast SWI2, and showed its ATPase activity is essential for transcriptional function.","evidence":"Yeast complementation with chimeric SWI2/BRG1, ATPase-dead K→R mutation abolishes activity in yeast and human cells","pmids":["8232556"],"confidence":"High","gaps":["No mammalian complex partners yet identified","No nucleosome substrate assay performed","Mechanism of transcriptional activation unknown"]},{"year":1994,"claim":"Demonstrating that BRG1 physically and functionally cooperates with the retinoblastoma protein RB linked chromatin remodeling to cell cycle control, answering how SWI/SNF activity intersects with tumor suppression.","evidence":"Yeast two-hybrid and reciprocal co-IP showing RB pocket–BRG1 interaction; disruption by E1A or RB-binding motif mutation abolishes growth arrest in SW13 cells","pmids":["7923370"],"confidence":"High","gaps":["Target genes of RB-BRG1 complex unidentified","In vivo relevance untested"]},{"year":1996,"claim":"Purification and functional characterization of the mammalian BAF complex established BRG1 as the ATPase engine of a multi-subunit nucleosome remodeling machine with cell-type-variable composition.","evidence":"Affinity purification of 9–12 subunit BAF complex; in vitro nucleosome disruption and transcription factor access assays; demonstration that BRG1 and BRM reside in separate complexes","pmids":["8895581","8804307"],"confidence":"High","gaps":["Minimal functional core not yet defined","Structural basis of subunit assembly unknown"]},{"year":1999,"claim":"Reconstitution of the minimal functional core (BRG1 + INI1 + BAF155 + BAF170) resolved which subunits are necessary and sufficient for nucleosome remodeling activity.","evidence":"In vitro nucleosome remodeling with purified recombinant proteins","pmids":["10078207"],"confidence":"High","gaps":["Role of accessory subunits (BAF60, BAF53, β-actin) in modulating activity not fully characterized","No structural model of assembled core"]},{"year":2000,"claim":"Identification of the RB–BRG1–HDAC repressor complex at cyclin E/A promoters and the BRCA1–BRG1 interaction established that BRG1 functions as both a transcriptional activator and repressor depending on its co-recruited partners.","evidence":"Co-IP and ChIP showing RB–BRG1–HDAC complex persists after CDK4 phosphorylation at cyclin A/CDC2 promoters; BRCA1 copurifies with BRG1 and requires it for p53-dependent transactivation","pmids":["10778858","10943845"],"confidence":"High","gaps":["Genome-wide scope of repressive vs. activating BRG1 occupancy unknown","How BRCA1 directs BRG1 to specific loci unclear"]},{"year":2004,"claim":"BRG1 reintroduction into BRG1-deficient tumor cells demonstrated that BRG1 directly activates CDK inhibitor genes (p21, p15) and cooperates with STAT3 to open chromatin and enable transcriptional elongation, providing a mechanistic basis for its tumor-suppressive function.","evidence":"BRG1 rescue in ALAB breast cancer cells upregulates p21/p15 and suppresses E2F targets; STAT3 recruits BRG1 to p21 promoter enabling H3 acetylation and Pol II CTD-Ser2 phosphorylation","pmids":["14673169","15286705"],"confidence":"High","gaps":["Relative contribution of BRG1's remodeling vs. scaffolding role at these loci not dissected","STAT3–BRG1 interaction based on single-lab co-IP"]},{"year":2009,"claim":"Discovery that TERT recruits BRG1 to β-catenin target gene promoters and that embryonic stem cells assemble a specialized esBAF complex revealed BRG1 as a central node linking Wnt signaling, telomerase biology, and pluripotency maintenance.","evidence":"TERT–BRG1 co-IP plus ChIP at Wnt target promoters in Xenopus and mouse; quantitative proteomics defining esBAF (BRG1-exclusive, BAF155-only) required for ES cell self-renewal","pmids":["19571879","19279220"],"confidence":"High","gaps":["Whether TERT enzymatic activity is required for the BRG1 interaction unclear","How esBAF is disassembled during differentiation not established"]},{"year":2011,"claim":"Endothelial conditional knockout revealed BRG1 controls vascular Wnt signaling at two levels—Wnt receptor transcription and β-catenin target gene activation—and subsequently showed BRG1 specifies venous identity via COUP-TFII chromatin remodeling.","evidence":"Conditional Brg1 deletion in embryonic endothelium; pharmacological β-catenin rescue; ChIP at COUP-TFII regulatory elements","pmids":["21262838","23406903"],"confidence":"High","gaps":["Upstream signals that activate BRG1 in endothelial cells unknown","Arterio-venous BRG1 regulatory mechanisms not dissected at single-cell level"]},{"year":2014,"claim":"Genome-wide ChIP-seq in embryonic tissues demonstrated that BRG1 predominantly occupies tissue-specific distal regulatory elements (enhancers) carrying both active (H3K27ac) and repressive (H3K27me3) marks, redefining BRG1 as a dual-function enhancer regulator.","evidence":"FLAG knock-in ChIP-seq across multiple embryonic tissues with histone mark co-mapping and transgenic enhancer validation","pmids":["24752179"],"confidence":"High","gaps":["How BRG1 switches between activating and repressive states at the same locus not resolved","Whether all distal sites require ATPase activity unknown"]},{"year":2017,"claim":"Structural and functional dissection of the BRG1 bromodomain revealed multivalent DNA and H3K14ac binding, while cancer-associated ATPase mutations were shown to act as dominant negatives depleting chromatin accessibility at active enhancers genome-wide.","evidence":"NMR/ITC of bromodomain–DNA and bromodomain–H3K14ac interactions; ATAC-seq/ChIP-seq in cells expressing heterozygous dominant-negative ATPase-dead BRG1","pmids":["28706277","29323272"],"confidence":"High","gaps":["Full-length BRG1 structural model absent","Whether dominant-negative effect operates through poison-subunit incorporation into all BAF subtypes untested"]},{"year":2018,"claim":"Identification of the CK1δ–FBW7 ubiquitin-dependent degradation pathway for BRG1, and the PTEN/AKT/GSK3β axis that stabilizes BRG1 in prostate cancer, established post-translational proteolysis as a major regulatory layer controlling BRG1 protein levels.","evidence":"In vitro kinase assay (CK1δ phosphorylates Ser31/35), ubiquitination assay, mutagenesis; PTEN-loss stabilizes BRG1 via AKT/GSK3β/FBXW7 inhibition in genetically engineered mice and organoids","pmids":["30177679","30496141"],"confidence":"High","gaps":["Whether other E3 ligases target BRG1 unknown","Tissue-specific regulation of BRG1 turnover not mapped"]},{"year":2019,"claim":"Demonstration that lncRNAs Xist and Evf2 directly bind and inhibit BRG1 ATPase/remodeling activity introduced RNA-mediated regulation as a mechanism for silencing BRG1 at specific genomic loci, including the inactive X chromosome.","evidence":"In vitro ATPase and remodeling assays with purified BRG1 and RNA; Xist deletion restores BRG1 binding to Xi with consequent TAD/superloop formation; Evf2 converts active enhancers to repressed state in developing forebrain","pmids":["30664740","26138476"],"confidence":"High","gaps":["RNA-binding domain of BRG1 not structurally resolved","Scope of regulatory lncRNAs beyond Xist and Evf2 unexplored"]},{"year":2020,"claim":"BRG1 loss was found to cause replication stress through deregulated CDC6-mediated origin firing, with BRG1-containing complexes physically engaging RPA, revealing a non-transcriptional role in replication fork stability.","evidence":"Single-molecule DNA fiber analysis, quantitative MS interactome, co-IP of BRG1–RPA; selective ATR inhibitor sensitivity of BRG1-deficient lung cancer","pmids":["32690724"],"confidence":"High","gaps":["Direct mechanistic link between chromatin remodeling and origin licensing not established","Whether the RPA interaction is BAF- or PBAF-specific unknown"]},{"year":2021,"claim":"CaMKII-dependent phosphorylation of BRG1 in neurons was shown to alter its interactions with NuRD and cohesin, governing activity-dependent enhancer activation and behavior, revealing a signaling-responsive switch for BRG1 function.","evidence":"Phospho-site knockin mice; co-IP showing phosphorylation-dependent NuRD/cohesin interaction changes; ChIP-seq and RNA-seq; anxiety-like behavioral phenotype","pmids":["34260936"],"confidence":"High","gaps":["Kinase(s) responsible for basal BRG1 phosphorylation at other sites not identified","Whether phosphorylation alters BAF complex composition in neurons untested"]},{"year":2022,"claim":"OTUD6A was identified as a deubiquitinase that stabilizes BRG1 by removing K27-linked polyubiquitin chains, complementing the FBW7-mediated degradation axis and revealing bidirectional ubiquitin regulation of BRG1 levels.","evidence":"MS screen, co-IP, in vitro and cellular ubiquitination assays, xenograft/PDX validation","pmids":["35233061"],"confidence":"High","gaps":["Whether OTUD6A targets BRG1 in all tissues or is context-specific unknown","Interplay between K27-linked and K48-linked ubiquitination on BRG1 uncharacterized"]},{"year":2023,"claim":"SMARCA4 loss was shown to rewire cellular metabolism by repressing GLUT1, reducing glycolysis, and creating dependency on glutamine import via SLC38A2 for OXPHOS, identifying a metabolic vulnerability exploitable by alanine competition.","evidence":"CRISPR KO, metabolic flux assays, glucose uptake measurements, RNA-seq, alanine supplementation in PDX models","pmids":["37210563"],"confidence":"High","gaps":["Whether metabolic rewiring occurs in all SMARCA4-mutant cancer types unknown","Direct chromatin mechanism linking BRG1 to GLUT1 transcription not fully delineated"]},{"year":null,"claim":"Outstanding questions include the high-resolution cryo-EM structure of full-length BRG1 within assembled BAF and PBAF complexes, the complete catalog of regulatory lncRNAs that modulate BRG1 activity, the mechanistic basis by which BRG1 switches between activating and repressive functions at the same enhancer, and whether the replication-fork-protective role of BRG1 operates through direct chromatin remodeling at origins or through an independent scaffolding function.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Full-length BRG1 cryo-EM structure in BAF/PBAF context not yet available","Systematic identification of regulatory RNAs targeting BRG1 not performed","Remodeling-independent scaffolding functions not formally dissected from ATPase-dependent roles"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,4,5,19,23,29]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[22]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,6,11,12,14,17,25]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[19,29]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2,18,25]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[18,29]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[18,25]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[2,5,18,23,29]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,6,11,12,17,25]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,6,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[14,16,26]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[15,17,19]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[31]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[24,35]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[23,33,36]}],"complexes":["BAF (SWI/SNF-A)","PBAF (SWI/SNF-B)","esBAF"],"partners":["RB1","BRCA1","SMARCB1","SMARCC1","SMARCC2","TERT","CTNNB1","ARID1A"],"other_free_text":[]},"mechanistic_narrative":"SMARCA4 (BRG1) is the catalytic ATPase subunit of mammalian SWI/SNF (BAF/PBAF) chromatin-remodeling complexes, coupling ATP hydrolysis to nucleosome displacement to regulate transcription, enhancer accessibility, DNA replication, and higher-order chromatin architecture. Together with a core of INI1, BAF155, and BAF170, BRG1 reconstitutes near-complete nucleosome remodeling activity, and combinatorial assembly of tissue-specific BAF subunits diversifies the complex for developmental and cell-type-specific gene programs including embryonic stem cell pluripotency and vascular endothelial identity [PMID:10078207, PMID:19279220, PMID:23406903]. BRG1 is recruited to target loci through interactions with transcription factors (RB, BRCA1, STAT3, β-catenin/TERT, glucocorticoid receptor pioneer factors FOXA1/GATA3, SOX10) and its own bromodomain-AT-hook DNA-binding module, while its activity is post-translationally regulated by CK1δ/FBW7-mediated ubiquitin-proteasomal degradation, OTUD6A deubiquitination, CaMKII phosphorylation, and direct inhibition by lncRNAs Xist and Evf2 [PMID:7923370, PMID:29792595, PMID:30177679, PMID:35233061, PMID:34260936, PMID:30664740]. Inactivating mutations cause dominant-negative loss of chromatin accessibility at active enhancers, aberrant H3K27me3 accumulation, replication stress with RPA-complex engagement, and metabolic rewiring toward glutamine/OXPHOS dependency, creating therapeutic vulnerabilities to ATR inhibition, KDM6 inhibition, and glutamine-transport competition [PMID:29323272, PMID:32690724, PMID:34262032, PMID:37210563]."},"prefetch_data":{"uniprot":{"accession":"P51532","full_name":"SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily A member 4","aliases":["BRG1-associated factor 190A","BAF190A","Mitotic growth and transcription activator","Protein BRG-1","Protein brahma homolog 1","SNF2-beta","Transcription activator BRG1"],"length_aa":1647,"mass_kda":184.6,"function":"ATPase involved in transcriptional activation and repression of select genes by chromatin remodeling (alteration of DNA-nucleosome topology). Component of SWI/SNF chromatin remodeling complexes that carry out key enzymatic activities, changing chromatin structure by altering DNA-histone contacts within a nucleosome in an ATP-dependent manner (PubMed:15075294, PubMed:29374058, PubMed:30339381, PubMed:32459350). Component of the CREST-BRG1 complex, a multiprotein complex that regulates promoter activation by orchestrating the calcium-dependent release of a repressor complex and the recruitment of an activator complex. In resting neurons, transcription of the c-FOS promoter is inhibited by SMARCA4-dependent recruitment of a phospho-RB1-HDAC repressor complex. Upon calcium influx, RB1 is dephosphorylated by calcineurin, which leads to release of the repressor complex. At the same time, there is increased recruitment of CREBBP to the promoter by a CREST-dependent mechanism, which leads to transcriptional activation. The CREST-BRG1 complex also binds to the NR2B promoter, and activity-dependent induction of NR2B expression involves the release of HDAC1 and recruitment of CREBBP (By similarity). Belongs to the neural progenitors-specific chromatin remodeling complex (npBAF complex) and the neuron-specific chromatin remodeling complex (nBAF complex). During neural development, a switch from a stem/progenitor to a postmitotic chromatin remodeling mechanism occurs as neurons exit the cell cycle and become committed to their adult state. The transition from proliferating neural stem/progenitor cells to postmitotic neurons requires a switch in subunit composition of the npBAF and nBAF complexes. As neural progenitors exit mitosis and differentiate into neurons, npBAF complexes which contain ACTL6A/BAF53A and PHF10/BAF45A, are exchanged for homologous alternative ACTL6B/BAF53B and DPF1/BAF45B or DPF3/BAF45C subunits in neuron-specific complexes (nBAF). The npBAF complex is essential for the self-renewal/proliferative capacity of the multipotent neural stem cells. The nBAF complex along with CREST plays a role regulating the activity of genes essential for dendrite growth. SMARCA4/BAF190A may promote neural stem cell self-renewal/proliferation by enhancing Notch-dependent proliferative signals, while concurrently making the neural stem cell insensitive to SHH-dependent differentiating cues (By similarity). Acts as a corepressor of ZEB1 to regulate E-cadherin transcription and is required for induction of epithelial-mesenchymal transition (EMT) by ZEB1 (PubMed:20418909). Binds via DLX1 to enhancers located in the intergenic region between DLX5 and DLX6 and this binding is stabilized by the long non-coding RNA (lncRNA) Evf2 (By similarity). Binds to RNA in a promiscuous manner (By similarity). In brown adipose tissue, involved in the regulation of thermogenic genes expression (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P51532/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SMARCA4","classification":"Not Classified","n_dependent_lines":422,"n_total_lines":1208,"dependency_fraction":0.34933774834437087},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000127616","cell_line_id":"CID001672","localizations":[{"compartment":"nucleoplasm","grade":3},{"compartment":"chromatin","grade":2}],"interactors":[{"gene":"ARID1A","stoichiometry":10.0},{"gene":"PHF10","stoichiometry":10.0},{"gene":"BCL7A","stoichiometry":10.0},{"gene":"SMARCB1","stoichiometry":10.0},{"gene":"SMARCC1","stoichiometry":10.0},{"gene":"SMARCE1","stoichiometry":10.0},{"gene":"SMARCD1","stoichiometry":10.0},{"gene":"SMARCC2","stoichiometry":10.0},{"gene":"SS18","stoichiometry":10.0},{"gene":"SMARCD2","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001672","total_profiled":1310},"omim":[{"mim_id":"620843","title":"HEAT-SHOCK TRANSCRIPTION FACTOR 5; HSF5","url":"https://www.omim.org/entry/620843"},{"mim_id":"620792","title":"OTOSCLEROSIS 12; OTSC12","url":"https://www.omim.org/entry/620792"},{"mim_id":"620006","title":"RAD54-LIKE 2; RAD54L2","url":"https://www.omim.org/entry/620006"},{"mim_id":"618779","title":"COFFIN-SIRIS SYNDROME 11; CSS11","url":"https://www.omim.org/entry/618779"},{"mim_id":"618502","title":"BRD4-INTERACTING CHROMATIN REMODELING COMPLEX-ASSOCIATED PROTEIN-LIKE; BICRAL","url":"https://www.omim.org/entry/618502"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli fibrillar center","reliability":"Supported"},{"location":"Nucleoli rim","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SMARCA4"},"hgnc":{"alias_symbol":["hSNF2b","BRG1","BAF190","SNF2","SWI2","SNF2-BETA","SNF2LB","FLJ39786"],"prev_symbol":["SNF2L4"]},"alphafold":{"accession":"P51532","domains":[{"cath_id":"-","chopping":"375-384_395-423","consensus_level":"medium","plddt":88.9085,"start":375,"end":423},{"cath_id":"3.40.50.10810","chopping":"734-981","consensus_level":"medium","plddt":83.97,"start":734,"end":981},{"cath_id":"3.40.50.300","chopping":"992-1257_1302-1330","consensus_level":"medium","plddt":82.5636,"start":992,"end":1330},{"cath_id":"1.20.920.10","chopping":"1457-1567","consensus_level":"medium","plddt":89.4411,"start":1457,"end":1567},{"cath_id":"1.20.5","chopping":"457-526","consensus_level":"high","plddt":83.8886,"start":457,"end":526}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P51532","model_url":"https://alphafold.ebi.ac.uk/files/AF-P51532-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P51532-F1-predicted_aligned_error_v6.png","plddt_mean":64.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SMARCA4","jax_strain_url":"https://www.jax.org/strain/search?query=SMARCA4"},"sequence":{"accession":"P51532","fasta_url":"https://rest.uniprot.org/uniprotkb/P51532.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P51532/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P51532"}},"corpus_meta":[{"pmid":"10319870","id":"PMC_10319870","title":"Maintenance 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One BRG1 complex and the hBrm complex contain components of the mammalian Sin3 (mSin3) repressor complex, and BRG1 directly interacts with mSin3A in vitro.\",\n      \"method\": \"Epitope-tagged affinity purification, biochemical fractionation, in vitro nucleosome remodeling assays, ATP hydrolysis assays, direct pulldown\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal biochemical methods including in vitro reconstitution and direct binding assays in a single study\",\n      \"pmids\": [\"11238380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"LKB1 (STK11) physically associates with BRG1 through the N-terminus of LKB1 and the helicase domain of BRG1, and LKB1 stimulates BRG1 ATPase activity. Expression of a kinase-dead LKB1 mutant blocks BRG1-dependent growth arrest in SW13 cells, establishing LKB1 as required for BRG1-mediated cell cycle arrest.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, ATPase activity assay, dominant-negative mutant expression, cell morphology/growth arrest phenotyping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro ATPase assay plus reciprocal binding plus functional epistasis in cells\",\n      \"pmids\": [\"11445556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"BRG1 reintroduction into BRG1-mutant breast tumor cells induces growth arrest accompanied by upregulation of p21 and p15 CDK inhibitors; p21 protein is recruited to a complex with CDK2 to inhibit its activity, and BRG1 associates with the p21 promoter in a p53-independent manner.\",\n      \"method\": \"BRG1 reintroduction (rescue experiment), gene expression analysis, ChIP at p21 promoter, CDK2 co-immunoprecipitation/kinase assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function/gain-of-function with defined molecular phenotype, ChIP, and co-IP kinase assay\",\n      \"pmids\": [\"14673169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"BRG1 associates with STAT3 and is recruited to the p21waf1 promoter upon STAT3 DNA binding, leading to histone H3 acetylation and increased promoter accessibility, followed by RNA polymerase II association and transcription elongation.\",\n      \"method\": \"Co-immunoprecipitation, pulldown, ChIP, restriction enzyme accessibility assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods but single lab\",\n      \"pmids\": [\"15286705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"BRG1 activation of the CSF1 gene disrupts a positioned nucleosome at the TG repeat sequence and induces Z-DNA formation; both BRG1 remodeling activity and Z-DNA formation are required cooperatively for effective chromatin remodeling of the CSF1 promoter.\",\n      \"method\": \"Nucleosome positioning assay, Z-DNA formation assay, chromatin remodeling assay, promoter accessibility analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical assays in a single study\",\n      \"pmids\": [\"16537901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Conditional deletion of Brg1 from embryonic blood vessels leads to downregulation of frizzled Wnt receptor genes, degradation of β-catenin, and decreased Wnt signaling in endothelial cells; pharmacological stabilization of β-catenin rescues Brg1 mutant vessel morphology, demonstrating that BRG1 modulates canonical Wnt signaling at the level of both Wnt receptor transcription and Wnt target gene transcription.\",\n      \"method\": \"Conditional knockout mouse model, pharmacological rescue, gene expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with pharmacological rescue and mechanistic epistasis\",\n      \"pmids\": [\"21262838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BRG1 promotes COUP-TFII expression in venous endothelial cells by binding conserved regulatory elements within the COUP-TFII promoter and remodeling chromatin to increase promoter accessibility; conditional Brg1 deletion results in downregulated COUP-TFII and aberrant arterial marker expression on veins.\",\n      \"method\": \"Conditional knockout mouse, ChIP, chromatin accessibility assay, gene expression analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with direct ChIP evidence for BRG1 binding and chromatin remodeling at target locus\",\n      \"pmids\": [\"23406903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"BRG1 loss in NSCLC cells alters nucleosome positioning and occupancy surrounding transcription start sites of cancer-associated genes, increases tumorigenic potential, and alters cellular morphology, establishing that BRG1-mediated nucleosome remodeling directly regulates gene expression relevant to lung cancer aggressiveness.\",\n      \"method\": \"BRG1 silencing (siRNA/shRNA), nucleosome positioning analysis, gene expression profiling, tumorigenic assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with nucleosome-level mechanistic readout\",\n      \"pmids\": [\"25115300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Genome-wide ChIP-seq in six embryonic mouse tissues shows SMARCA4 binds both active enhancers (marked by H3K27ac) and repressed regulatory elements (marked by repressive marks), and is associated with tissue-specific up- or downregulation of gene expression, indicating a dual active/repressive function at distal regulatory sequences in vivo.\",\n      \"method\": \"ChIP-seq, histone modification profiling, transgenic mouse enhancer assays\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP-seq with multiple histone mark profiles and functional transgenic validation\",\n      \"pmids\": [\"24752179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The lncRNA Evf2 directly inhibits BRG1 ATPase and chromatin remodeling activities through RNA-BRG1 binding, while simultaneously increasing BRG1 association with DNA regulatory enhancers via a DLX1-containing ribonucleoprotein complex; BRG1 directly interacts with DLX1 and Evf2 through distinct binding sites.\",\n      \"method\": \"Mass spectrometry, co-IP, in vitro ATPase inhibition assay, in vitro chromatin remodeling assay, ChIP, RNA colocalization (nuclear imaging)\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro ATPase/remodeling assays with MS-identified interactors and ChIP\",\n      \"pmids\": [\"26138476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Brg1 in zebrafish heart promotes regeneration after injury by interacting with Dnmt3ab and suppressing expression of cyclin-dependent kinase inhibitors cdkn1a and cdkn1c through Dnmt3ab-dependent DNA methylation at the cdkn1c promoter.\",\n      \"method\": \"Transgenic dominant-negative Brg1 expression, RNA-seq, RNAscope, co-IP (Brg1-Dnmt3ab), methylation analysis at cdkn1c promoter\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus functional methylation assay and in vivo phenotype\",\n      \"pmids\": [\"27929112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SMARCA4/Brg1 coordinates with transcription factors Gli1, Atoh1, and REST to regulate oncogene and tumor suppressor expression in Shh-type medulloblastoma, and modulates H3K27me3 modifier activities to control gene expression; Brg1 deletion in precancerous progenitors significantly inhibits tumor formation.\",\n      \"method\": \"Conditional knockout mouse, genome-wide expression analysis, ChIP, genome-wide binding analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with genome-wide binding and histone modification evidence\",\n      \"pmids\": [\"27065321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SMARCA4 cancer missense mutations target conserved ATPase surfaces and disrupt the mechanochemical cycle of remodeling; heterozygous expression of these mutants acts dominantly to alter chromatin accessibility at thousands of active enhancers (losing H3K27ac but not H3K4me1) across the genome, including superenhancers, and induces pro-oncogenic expression changes including increased MYC.\",\n      \"method\": \"Mutagenesis of ATPase domain, ATAC-seq, ChIP-seq for histone marks, gene expression profiling\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ATPase mutagenesis combined with genome-wide chromatin accessibility and histone mark profiling\",\n      \"pmids\": [\"29323272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BRG1 and hBRM bromodomains have DNA-binding activity through a basic patch surface; the bromodomain and an adjacent AT-hook make multivalent contacts with DNA leading to robust affinity for AT-rich elements. Although BRDs can bind both DNA and H3K14ac simultaneously, DNA-binding rather than histone binding drives association with nucleosomes in vitro; neither contributes substantially to global chromatin affinity of BRG1 in mouse ESCs.\",\n      \"method\": \"NMR, binding assays (ITC, fluorescence), mutagenesis, nucleosome binding assays, ChIP in mouse ESCs\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural and biochemical reconstitution with mutagenesis validated in cells\",\n      \"pmids\": [\"28706277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BRG1 is required for proper glucocorticoid receptor (GR) transcriptional response; BRG1 pre-occupies GR binding sites before hormone exposure, establishes accessible chromatin, and is required for recruitment of pioneer factors FOXA1 and GATA3 to GR binding sites.\",\n      \"method\": \"BRG1 knockdown, ChIP-seq, ATAC-seq, gene expression analysis in human breast cancer cells\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP-seq and ATAC-seq with loss-of-function, multiple orthogonal methods\",\n      \"pmids\": [\"29792595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SCFFBW7 ubiquitin ligase complex targets BRG1 for ubiquitination-mediated proteasomal degradation; CK1δ phosphorylates BRG1 at Ser31/Ser35 to facilitate FBW7 binding; BRG1 stabilization in gastric cancer suppresses E-cadherin expression to promote metastasis.\",\n      \"method\": \"Co-IP, ubiquitination assay, phosphorylation mapping, siRNA knockdown, rescue experiments, clinical sample correlation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical reconstitution of ubiquitination, phosphorylation site mapping, functional rescue\",\n      \"pmids\": [\"30177679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BRG1 in liver hepatocytes interacts with β-catenin to potentiate Wnt signaling and promote hepatocyte proliferation; mechanistically, Brg1 recruits lysine demethylase KDM4 to activate β-catenin target genes during liver regeneration.\",\n      \"method\": \"Hepatocyte-specific Brg1 knockout mice, partial hepatectomy, co-IP (Brg1-β-catenin), ChIP (KDM4 recruitment)\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with co-IP and ChIP evidence for molecular mechanism\",\n      \"pmids\": [\"30001167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BRG1 binds to the Sox9 promoter to directly regulate its expression and is critical for recruitment of upstream regulators including PDX1 to the Sox9 promoter and enhancer in acinar cells; BRG1 deletion in acinar cells impairs acinar-to-ductal metaplasia and PanIN formation, and Sox9 overexpression rescues the PanIN phenotype.\",\n      \"method\": \"Conditional knockout mouse (Ptf1a-CreER; KrasG12D; Brg1fl/fl), ChIP, transgenic rescue with Sox9 overexpression, dual recombinase system\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis rescue with direct ChIP evidence for BRG1 at Sox9 locus\",\n      \"pmids\": [\"30010625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PTEN loss stabilizes BRG1 protein through inhibition of the AKT/GSK3β/FBXW7 degradation axis; increased BRG1 in PTEN-deficient prostate cancer cells drives chromatin remodeling into protumorigenic configurations, creating synthetic lethality between PTEN loss and BRG1.\",\n      \"method\": \"Genetically engineered mice, organoid assays, co-IP, protein stability assays, chromatin remodeling profiling, BRG1 antagonist preclinical models\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vivo and in vitro methods establishing mechanism\",\n      \"pmids\": [\"30496141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Xist lncRNA directly interacts with BRG1 and inhibits its nucleosome-remodeling and ATPase activities in vitro; in cells, Xist expels BRG1 from the inactive X chromosome (Xi), and Xist deletion leads to return of BRG1 to Xi correlating with cohesin binding and restoration of topologically associated domains and superloops.\",\n      \"method\": \"In vitro RNA-binding and ATPase inhibition assays, RNA IP, ChIP-seq, Hi-C, ATAC-seq\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro ATPase inhibition assay plus genome-wide chromatin and 3D architecture studies\",\n      \"pmids\": [\"30664740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BRG1-containing SWI/SNF complexes interact with RPA complexes (shown by quantitative mass spectrometry and co-IP); BRG1 loss leads to activation of replication stress responses with increased origin firing mediated by the prelicensing protein CDC6, and BRG1-deficient lung cancers are sensitive to ATR inhibition.\",\n      \"method\": \"Quantitative mass spectrometry, co-IP, single-molecule replication fork dynamics assay (DNA fiber), ATR inhibitor sensitivity assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — MS-identified interaction, co-IP, and single-molecule replication assay\",\n      \"pmids\": [\"32690724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BRG1 interacts with activator protein 1 (AP-1)/RelA to activate CCL7 transcription in hepatocytes in a redox-sensitive manner; CK2-catalyzed phosphorylation of BRG1 is required for this activity. Hepatocyte-specific BRG1 deletion abolishes CCL7 induction and macrophage infiltration in mouse livers.\",\n      \"method\": \"Hepatocyte-specific conditional KO, co-IP (BRG1-AP-1), ChIP, antioxidant blockade, in vitro hepatocyte treatment\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with co-IP and ChIP, single lab\",\n      \"pmids\": [\"34454163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Neuronal activity induces CaMKII-dependent serine phosphorylation of BRG1 at a specific site; this phosphorylation alters BRG1 interaction with NuRD repressor complex and cohesin, affects BRG1 recruitment to enhancers in an H3K27Ac-dependent manner, and regulates enhancer-promoter looping, RNA Pol II recruitment, and enhancer RNA expression.\",\n      \"method\": \"Knockin mice (non-phosphorylatable and phosphomimic BRG1), ChIP-seq, CaMKII inhibition, co-IP, behavioral phenotyping\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knockin mouse models with multiple orthogonal molecular readouts\",\n      \"pmids\": [\"34260936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OTUD6A deubiquitinase stabilizes BRG1 by erasing K27-linked polyubiquitination of BRG1; mass spectrometry identified BRG1 as an OTUD6A substrate, and catalytically inactive OTUD6A fails to stabilize BRG1 or promote prostate cancer progression.\",\n      \"method\": \"Mass spectrometry substrate screen, co-IP, ubiquitination assay with linkage-specific antibodies, catalytic mutant OTUD6A, in vivo mouse models\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — MS identification, biochemical ubiquitination assay with linkage specificity, and catalytic mutant validation\",\n      \"pmids\": [\"35233061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SMARCA4/2-loss represses GLUT1 expression, reducing glucose uptake and glycolysis while increasing dependency on oxidative phosphorylation (OXPHOS); these cells upregulate SLC38A2 to import glutamine for OXPHOS fueling, creating vulnerability to OXPHOS inhibitors and glutamine metabolism inhibitors.\",\n      \"method\": \"SMARCA4/2 knockdown/KO, metabolic flux assays, glucose uptake assay, gene expression profiling, patient-derived xenografts\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal metabolic assays with in vivo xenograft validation\",\n      \"pmids\": [\"37210563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Brg1 controls chromatin remodeling and transcription at the Pax7 promoter in primary myoblasts; deletion of Brg1 in satellite-cell-derived myoblasts causes proliferation defects and apoptosis, which are rescued by reintroduction of catalytically active Brg1 or by Pax7 overexpression.\",\n      \"method\": \"Conditional Brg1 deletion in primary myoblasts, ChIP, rescue by Brg1 reintroduction and Pax7 overexpression, apoptosis and proliferation assays\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with genetic rescue and ChIP, single lab\",\n      \"pmids\": [\"26036967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"hELD/OSA1 (a human homologue of Drosophila Eld/Osa) binds directly to BRG1 through its EHD2 domain and is found in endogenous SWI/SNF complexes, identifying hELD/OSA1 as a BRG1-interacting subunit that may modulate complex targeting.\",\n      \"method\": \"Domain mapping, direct binding assay, co-immunoprecipitation of endogenous complex\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP with domain mapping, single lab\",\n      \"pmids\": [\"11988099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BRG1 knockdown globally alters long-range genomic interactions and reduces TAD boundary strength, with evidence that BRG1 affects nucleosome occupancy around CTCF sites at TAD boundaries, suggesting BRG1 contributes to genome architecture through CTCF and topoisomerase regulation.\",\n      \"method\": \"BRG1 knockdown, Hi-C, ChIP\",\n      \"journal\": \"Nucleus (Austin, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genome-wide 3D genome analysis but mechanism partly speculative\",\n      \"pmids\": [\"28060558\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SMARCA4/BRG1 is the catalytic ATPase subunit of the mammalian SWI/SNF (BAF/PBAF) chromatin remodeling complex that couples ATP hydrolysis to nucleosome remodeling; it assembles into at least two biochemically distinct complexes (including mSin3A-containing repressive forms), is recruited to gene promoters and distal enhancers by transcription factors (STAT3, GR, NF-κB, AP-1) and lncRNAs (Evf2, Xist), remodels chromatin to control accessibility and gene expression, interacts with RPA complexes to suppress replication stress, and is subject to multiple post-translational regulatory events including CK1δ/FBW7-mediated ubiquitin-proteasomal degradation, OTUD6A-mediated K27-deubiquitination stabilization, AKT/GSK3β/FBXW7-regulated stability, and CaMKII-induced phosphorylation that modulates its interactions with cohesin and the NuRD repressor complex to regulate neuronal activity-dependent enhancer activation.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1993,\n      \"finding\": \"BRG1 encodes a 205 kDa nuclear protein containing a DNA-dependent ATPase domain homologous to SWI2/SNF2; a SWI2/BRG1 chimera with the ATPase domain replaced by human sequence rescued mitotic growth and transcriptional activation in swi2- yeast, while point mutation of the conserved ATP-binding lysine abolished complementation and exerted a dominant-negative effect; the same lysine-to-arginine substitution in BRG1 generated a transcriptional dominant negative in human cells.\",\n      \"method\": \"Yeast complementation, site-directed mutagenesis, dominant-negative overexpression in human cells\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional reconstitution with mutagenesis in two organisms\",\n      \"pmids\": [\"8232556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"BRG1 physically interacts with the retinoblastoma protein (RB) via a conserved RB-binding motif; the interaction requires the hypophosphorylated form of RB and the A/B pocket; BRG1-RB cooperation is required for BRG1-induced growth arrest (flat cell formation) in SW13 carcinoma cells, and sequestration of RB by adenovirus E1A or mutation of the RB-binding motif in BRG1 abolishes this activity.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, dominant-negative BRG1 expression, functional rescue assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reciprocal co-IP plus functional epistasis, foundational paper with high citations\",\n      \"pmids\": [\"7923370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"BRG1 was purified as part of a mammalian SWI/SNF complex of 9–12 proteins (BRG1-associated factors, BAFs); the BRG1 complex can disrupt nucleosomes and facilitate binding of GAL4-VP16 to nucleosomal templates in vitro; BRG1 and hBRM are present in separate, distinct complexes with heterogeneous subunit compositions across cell types.\",\n      \"method\": \"Affinity purification, microsequencing, in vitro nucleosome disruption assay, GAL4-VP16 chromatin binding assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical reconstitution with nucleosome disruption assay, foundational complex characterization\",\n      \"pmids\": [\"8895581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The mammalian SWI/SNF complex exists in multiple forms with distinct subunit compositions; BAF60b is found in a complex that shares some but not all subunits with the BRG1 complex; tissue-specific BAF subunits (BAF60b in muscle, BAF60c in pancreas) diversify the complex for developmental functions.\",\n      \"method\": \"Affinity purification, cDNA cloning, co-immunoprecipitation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — MS/sequencing combined with co-IP, replicated across multiple cell lines\",\n      \"pmids\": [\"8804307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Antigen receptor signaling induces rapid association of the BRG1-containing BAF complex with chromatin; phosphatidylinositol 4,5-bisphosphate (PIP2) is sufficient in vitro to target the BAF complex to chromatin but has no effect on related complexes containing SNF2L/hISWI; β-actin and BAF53 (actin-related protein) are subunits of the BAF complex required for maximal BRG1 ATPase activity and for chromatin/matrix association.\",\n      \"method\": \"Biochemical fractionation, in vitro chromatin-targeting assay with PIP2, peptide sequencing, ATPase assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with ATPase assay plus functional specificity demonstrated\",\n      \"pmids\": [\"9845365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Both BRG1 and hBRM, as purified proteins, are capable of remodeling mono-nucleosomes and nucleosomal arrays in an ATP-dependent manner; addition of INI1, BAF155, and BAF170 to BRG1 increases remodeling activity to levels comparable to the whole hSWI/SNF complex, defining the functional core.\",\n      \"method\": \"In vitro nucleosome remodeling reconstitution with purified recombinant subunits\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with defined subunit combinations\",\n      \"pmids\": [\"10078207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"RB forms a repressor complex containing HDAC and the hSWI/SNF (BRG1-containing) nucleosome remodeling complex that inhibits transcription of cyclins E and A; phosphorylation of RB by cyclin D/CDK4 disrupts the HDAC association but the Rb-hSWI/SNF complex persists and maintains repression of cyclin A and CDC2 genes, controlling exit from S phase.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation, reporter assays, dominant-negative BRG1\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with functional epistasis, replicated findings on RB-BRG1 axis\",\n      \"pmids\": [\"10778858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"BRCA1 directly interacts with the BRG1 subunit of a SWI/SNF-related complex isolated from human cells; this complex displays chromatin-remodeling activity; p53-mediated transcriptional stimulation by BRCA1 is abrogated by dominant-negative BRG1 or by the cancer-causing BRCA1 exon 11 deletion.\",\n      \"method\": \"Affinity/conventional chromatography, mass spectrometry, direct binding assay, dominant-negative functional assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — purified complex characterization with direct binding and functional epistasis\",\n      \"pmids\": [\"10943845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"BRG1 fractionates into two biochemically distinct complexes (differing in activity and subunit composition), while hBRM forms one complex with lower remodeling activity; one BRG1 complex and the hBRM complex contain components of the mSin3 repressor complex; BRG1, hBRM, and BAF155 directly interact with mSin3A in vitro, linking hSWI/SNF complexes to gene repression.\",\n      \"method\": \"Epitope-tag affinity purification, nucleosome remodeling assay, restriction enzyme accessibility assay, ATPase assay, in vitro pulldown\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro remodeling assays plus direct binding, multiple orthogonal methods\",\n      \"pmids\": [\"11238380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"LKB1 (STK11) physically associates with BRG1 via LKB1's N-terminus and BRG1's helicase domain; LKB1 stimulates BRG1 ATPase activity; expression of kinase-dead LKB1 (SL26) blocks BRG1-dependent growth arrest (flat cell formation) in SW13 cells, indicating LKB1 is required for BRG1-mediated growth arrest.\",\n      \"method\": \"Co-immunoprecipitation, in vitro pulldown, ATPase assay, dominant-negative functional assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct binding with ATPase stimulation assay plus functional epistasis\",\n      \"pmids\": [\"11445556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"hELD/OSA1 (ARID1A homolog) is a BRG1-interacting protein; the EHD2 domain of hELD/OSA1 mediates direct binding to BRG1; hELD/OSA1 is present in endogenous SWI/SNF complexes from mouse brain.\",\n      \"method\": \"cDNA cloning, co-immunoprecipitation, in vitro binding domain mapping\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single pulldown/co-IP with domain mapping\",\n      \"pmids\": [\"11988099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"BRG1 reintroduction into BRG1-mutant breast tumor cells (ALAB) induced growth arrest associated with up-regulation of CDK inhibitors p21 and p15 and down-regulation of E2F targets (cyclin E); p21 protein was recruited to a complex with CDK2 inhibiting its activity; BRG1 associates with the p21 promoter in a p53-independent manner.\",\n      \"method\": \"Cell line rescue (BRG1 reintroduction), chromatin immunoprecipitation, CDK2 kinase assay, co-immunoprecipitation, microarray/real-time PCR\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in defined mutant cell line model\",\n      \"pmids\": [\"14673169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"STAT3 associates with BRG1 by co-immunoprecipitation and pulldown; STAT3 DNA binding recruits BRG1 to the p21waf1 promoter, resulting in histone H3 acetylation and increased chromatin accessibility; BRG1 loading is followed by RNA polymerase II association and subsequent CDK9-mediated Ser2 phosphorylation of the CTD, enabling transcription elongation.\",\n      \"method\": \"Co-immunoprecipitation, pulldown, chromatin immunoprecipitation, restriction enzyme accessibility (Southern blot)\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — co-IP plus ChIP with functional accessibility assay, single lab\",\n      \"pmids\": [\"15286705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"BRG1-mediated activation of the CSF1 gene results in Z-DNA formation at a TG repeat within the promoter; BRG1 disrupts a positioned nucleosome at the silent CSF1 promoter; both BRG1 activity and Z-DNA formation are required for effective chromatin remodeling, with Z-DNA promoting the transition from transient to extensive nucleosome disruption.\",\n      \"method\": \"Chromatin immunoprecipitation, nucleosome mapping, Z-DNA specific antibody staining, reporter assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP combined with nucleosome positioning and functional reporter, single lab\",\n      \"pmids\": [\"16537901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TERT (telomerase reverse transcriptase) interacts with BRG1 and activates Wnt-dependent reporters; TERT physically occupies promoters of Wnt-dependent genes in vivo; TERT-BRG1 interaction places BRG1 as a cofactor in a β-catenin transcriptional complex modulating the Wnt/β-catenin signaling pathway.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), luciferase reporter assay, Xenopus embryo knockdown, mouse knockout\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus ChIP plus in vivo genetic models\",\n      \"pmids\": [\"19571879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ES cells express a specialized esBAF complex defined by the presence of BRG1 (not BRM), BAF155 (not BAF170), and BAF60A (not BAF60C); this specific subunit composition is required for ES cell self-renewal and pluripotency; esBAF directly interacts with key pluripotency regulators.\",\n      \"method\": \"Quantitative proteomics, conditional knockout in ES cells, co-immunoprecipitation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomic identification plus genetic loss-of-function with defined cellular phenotype\",\n      \"pmids\": [\"19279220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BRG1 deletion from embryonic blood vessel endothelium results in down-regulation of Frizzled Wnt receptors, degradation of β-catenin, and decreased Wnt signaling; pharmacological β-catenin stabilization substantially rescues BRG1 mutant vascular phenotypes; BRG1 regulates canonical Wnt signaling at two levels — transcription of Wnt receptor genes and Wnt target genes.\",\n      \"method\": \"Conditional knockout mouse, pharmacological rescue, qRT-PCR, chromatin immunoprecipitation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in vivo with pharmacological rescue\",\n      \"pmids\": [\"21262838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BRG1 promotes venous endothelial identity by binding conserved regulatory elements within the COUP-TFII promoter and remodeling chromatin to make it accessible to transcriptional machinery; conditional Brg1 deletion from vascular endothelium downregulates COUP-TFII and causes aberrant arterial marker expression on veins.\",\n      \"method\": \"Conditional knockout mouse, chromatin immunoprecipitation, chromatin accessibility assay\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic deletion with ChIP-based mechanistic evidence\",\n      \"pmids\": [\"23406903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SMARCA4/BRG1 binding in embryonic mouse tissues is predominantly distal from promoters and largely tissue-specific (73% of distal sites confined to one or few tissues); SMARCA4 associates with both active (H3K27ac) and repressive (H3K27me3) chromatin states at distal regulatory elements, indicating dual activating/repressive functions at enhancers in vivo.\",\n      \"method\": \"ChIP-seq with FLAG knock-in mouse, histone modification ChIP-seq, transgenic enhancer assays\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP-seq with in vivo enhancer validation\",\n      \"pmids\": [\"24752179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BRG1 directly interacts with DLX1 and the lncRNA Evf2 through distinct binding sites; Evf2 directly inhibits BRG1 ATPase and chromatin remodeling activities in vitro; in the developing forebrain, Evf2 colocalizes with BRG1, increases BRG1 association with enhancers, yet converts active enhancers to repressed enhancers by inhibiting chromatin remodeling; mutations causing Coffin-Siris syndrome localize to the RNA-binding and DLX1-binding domains of BRG1.\",\n      \"method\": \"Mass spectrometry, co-immunoprecipitation, in vitro ATPase assay, in vitro chromatin remodeling assay, ChIP, live-cell imaging\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro ATPase/remodeling assay plus co-IP and ChIP with multiple orthogonal methods\",\n      \"pmids\": [\"26138476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Zebrafish Brg1 is essential for adult heart regeneration; injury-induced Brg1 interacts with Dnmt3ab and suppresses expression of cdkn1c by increasing CpG methylation at its promoter, thereby repressing CDK inhibitor expression and enabling myocardial proliferation.\",\n      \"method\": \"Transgenic dominant-negative Brg1 overexpression, co-immunoprecipitation, bisulfite sequencing, RNA-seq, RNAscope\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with mechanistic functional readout (methylation, proliferation) in vivo\",\n      \"pmids\": [\"27929112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SMARCA4/Brg1 coordinates Shh-type medulloblastoma transcriptional program by interacting with Gli1, Atoh1, and REST; Brg1 modulates the activity of H3K27me3 modifiers (Polycomb) to regulate medulloblastoma gene expression; Brg1 deletion inhibits tumor formation and progression in a mouse Shh-MB model.\",\n      \"method\": \"Conditional knockout mouse model, genome-wide expression profiling, ChIP, co-immunoprecipitation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model combined with ChIP and co-IP\",\n      \"pmids\": [\"27065321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The BRG1 bromodomain (BRD) has moderate specificity for H3K14ac and unexpectedly also binds DNA through a basic patch surface; the BRD and adjacent AT-hook make multivalent contacts with DNA with moderate specificity for AT-rich elements; BRD can bind DNA and H3K14ac simultaneously, but DNA rather than histone binding drives nucleosome association in vitro, while neither contributes to global chromatin affinity of BRG1 in mouse ES cells.\",\n      \"method\": \"NMR, ITC, fluorescence polarization, in vitro nucleosome binding assay, ChIP-seq in mouse ES cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural NMR plus in vitro binding assays plus in vivo ChIP-seq\",\n      \"pmids\": [\"28706277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SMARCA4 cancer missense mutations target conserved ATPase surfaces and disrupt the mechanochemical remodeling cycle; heterozygous expression of these dominant-negative mutants alters open chromatin at thousands of genomic sites, specifically depleting accessibility at active enhancers (losing H3K27ac) predominantly in A compartments; this correlates with pro-oncogenic transcriptional changes including increased MYC expression.\",\n      \"method\": \"Biochemical ATPase assay, ATAC-seq, ChIP-seq, RNA-seq, dominant-negative mutant cell lines\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ATPase disruption biochemistry plus genome-wide chromatin assays, multiple orthogonal methods\",\n      \"pmids\": [\"29323272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BRG1 is a ubiquitin substrate of SCF-FBW7; CK1δ phosphorylates BRG1 at Ser31/Ser35, facilitating FBW7 binding and subsequent ubiquitination-mediated degradation; stabilization of BRG1 in gastric cancer cells suppresses E-cadherin expression and promotes metastasis.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, ubiquitination assay, site-directed mutagenesis, cell migration/invasion assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro kinase assay and ubiquitination assay with mutagenesis\",\n      \"pmids\": [\"30177679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BRG1 is required for proper glucocorticoid receptor (GR) transcriptional response in breast cancer cells; BRG1 pre-occupies GR binding sites prior to hormone exposure; BRG1 knockdown blocks recruitment of pioneer factors FOXA1 and GATA3 to GR binding sites, and GR interaction with FOXA1/GATA3 sites is restricted to BRG1 pre-bound loci.\",\n      \"method\": \"ChIP-seq, siRNA knockdown, hormone treatment, ATAC-seq\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP-seq with functional siRNA knockdown revealing pioneer factor epistasis\",\n      \"pmids\": [\"29792595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Brg1 interacts with β-catenin to potentiate Wnt signaling in hepatocytes; Brg1 recruits lysine demethylase 4 (KDM4) to activate β-catenin target genes; hepatocyte-specific Brg1 deletion compromises liver regeneration and dampens survival after partial hepatectomy.\",\n      \"method\": \"Hepatocyte-specific conditional knockout, co-immunoprecipitation, ChIP, partial hepatectomy model\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus ChIP plus in vivo model, single lab\",\n      \"pmids\": [\"30001167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BRG1 binds to Sox9 promoter regulatory regions and is critical for SOX9 expression in acinar cells; BRG1 recruits upstream regulators PDX1 to the Sox9 promoter and enhancer; BRG1/SOX9 axis is required for acinar-to-ductal metaplasia and PanIN formation in Kras-driven pancreatic tumorigenesis.\",\n      \"method\": \"Conditional knockout mouse (Ptf1a-CreER; KrasG12D; Brg1fl/fl), ChIP, Sox9 rescue overexpression, organoid assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model with ChIP and epistasis rescue experiment\",\n      \"pmids\": [\"30010625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BRG1 loss in prostate cancer cells is synthetically lethal with PTEN loss; PTEN loss stabilizes BRG1 protein through inhibition of the AKT/GSK3β/FBXW7 degradation axis; increased BRG1 in PTEN-deficient cells drives a protumorigenic chromatin configuration causing BRG1 addiction.\",\n      \"method\": \"Genetically engineered mice, organoid assays, co-immunoprecipitation, western blotting, pharmacological BRG1 inhibitor\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic models with mechanistic pathway dissection using multiple orthogonal approaches\",\n      \"pmids\": [\"30496141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Xist lncRNA directly interacts with BRG1 in vitro and in cell culture; RNA binding inhibits BRG1 nucleosome-remodeling and ATPase activities in vitro; Xist expels BRG1 from the inactive X chromosome (Xi), and Xist deletion leads to selective return of BRG1 to the Xi correlating with cohesin binding, TAD restoration, and de novo superloop formation.\",\n      \"method\": \"In vitro ATPase assay, in vitro remodeling assay, RNA immunoprecipitation, ATAC-seq, Hi-C/ChIP-seq\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro ATPase/remodeling assay plus genome-wide chromatin analyses\",\n      \"pmids\": [\"30664740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BRG1 interacts with RORγ to be recruited to the Elovl3 promoter; BRG1 interacts with histone acetyltransferase p300 at the Elovl3 promoter to activate transcription; BRG1 knockdown attenuates prostate cancer cell migration and invasion concomitant with Elovl3 down-regulation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, migration/invasion assay\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — co-IP with ChIP, single lab\",\n      \"pmids\": [\"31154107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BRG1 deletion in lung cancer leads to replication stress with increased origin firing mediated by CDC6; BRG1-containing SWI/SNF complexes interact with RPA complexes as shown by quantitative mass spectrometry and co-immunoprecipitation; BRG1-deficient lung cancers are selectively sensitive to ATR inhibition.\",\n      \"method\": \"Gain/loss-of-function genetic approaches, single-molecule replication fork analysis, quantitative mass spectrometry, co-immunoprecipitation, pharmacological ATR inhibition\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — single-molecule replication analysis plus MS interactome plus functional pharmacological epistasis\",\n      \"pmids\": [\"32690724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Neuronal stimulation induces a CaMKII-sensitive serine phosphorylation of BRG1; phosphorylation alters BRG1 interactions with the NuRD repressor complex and cohesin; non-phosphorylatable BRG1 (knockin) fails to efficiently induce activity-dependent genes, while phosphomimic BRG1 increases enhancer activity; these mutant mice display anxiety-like phenotypes.\",\n      \"method\": \"Site-directed mutagenesis knockin mice, co-immunoprecipitation, ChIP-seq, RNA-seq, behavioral testing\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knockin mutagenesis in vivo with co-IP and genome-wide ChIP-seq\",\n      \"pmids\": [\"34260936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SMARCA4-mutant cells show impaired transactivation and significantly reduced levels of histone demethylases KDM6A/UTX and KDM6B/JMJD3, with aberrant accumulation of H3K27me3; SMARCA4-mutant cells are highly dependent on these demethylases for viability, and KDM6 inhibition (GSK-J4) has strong antitumor effects in orthotopic SMARCA4-mutant lung cancer and SCCOHT models.\",\n      \"method\": \"Western blotting, pharmacological KDM6 inhibition (GSK-J4), orthotopic xenograft models, histone modification profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic in vitro characterization validated in multiple in vivo models\",\n      \"pmids\": [\"34262032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SMARCA4 colocalizes with SOX10 at gene regulatory elements in diffuse midline glioma (DMG) cells; SMARCA4 chromatin binding is reduced upon depletion of SOX10 or the H3.3K27M mutation; SMARCA4 occupancy at H3K27ac+SOX10 enhancers is most reduced upon depleting H3.3K27M, indicating H3.3K27M epigenome reprogramming creates a dependency on SMARCA4 for gene expression.\",\n      \"method\": \"ChIP-seq, siRNA depletion, patient-derived xenograft models, loss-of-function genetic approaches\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP-seq with genetic depletion and in vivo xenograft validation\",\n      \"pmids\": [\"36305747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OTUD6A deubiquitinase stabilizes BRG1 by erasing K27-linked polyubiquitination on BRG1 (and K11-linked polyubiquitination on AR); identified via mass spectrometry screening; OTUD6A is required for prostate cancer cell progression, and OTUD6A oligonucleotides suppress tumorigenesis in vivo.\",\n      \"method\": \"Mass spectrometry screening, co-immunoprecipitation, ubiquitination assay, in vivo xenograft/PDX models\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — MS identification with ubiquitination assay and in vivo validation\",\n      \"pmids\": [\"35233061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SMARCA4/2 loss represses GLUT1 expression, reducing glucose uptake and glycolysis while increasing dependency on oxidative phosphorylation; these cells upregulate SLC38A2 to import glutamine for fueling OXPHOS; alanine supplementation competes with glutamine for SLC38A2 import and selectively induces death in SMARCA4/2-deficient cancer cells, synergizing with OXPHOS inhibitors.\",\n      \"method\": \"CRISPR knockout, metabolic flux assays, glucose uptake assay, RNA-seq, patient-derived xenografts, alanine supplementation experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with metabolic mechanistic assays and in vivo validation\",\n      \"pmids\": [\"37210563\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SMARCA4/BRG1 is the catalytic ATPase subunit of mammalian SWI/SNF (BAF/PBAF) chromatin-remodeling complexes that couples ATP hydrolysis to nucleosome displacement and DNA translocation; it physically interacts with RB, BRCA1, STAT3, LKB1, β-catenin, TERT, RPA complexes, and pioneer transcription factors to regulate cell cycle progression, DNA replication stress responses, enhancer accessibility, Wnt/β-catenin and Wnt-vascular signaling, pluripotency, and tissue-specific gene programs; its activity is regulated post-translationally by CK1δ/FBW7-mediated ubiquitin-proteasomal degradation, OTUD6A-mediated deubiquitination, CaMKII-induced phosphorylation, and direct inhibition by lncRNAs (Xist, Evf2), and its inactivation in cancer causes replication stress, aberrant H3K27me3 accumulation, and metabolic reprogramming toward glutamine/OXPHOS dependency.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SMARCA4 (BRG1) is the catalytic ATPase subunit of mammalian SWI/SNF chromatin remodeling complexes that couples ATP hydrolysis to nucleosome repositioning and eviction, thereby controlling chromatin accessibility at promoters, enhancers, and topologically associating domain boundaries across diverse developmental and homeostatic contexts. BRG1 assembles into biochemically distinct complexes—including mSin3A-containing repressive forms—and is recruited to specific genomic loci by transcription factors (STAT3, GR, AP-1/RelA, Gli1, DLX1) and long noncoding RNAs (Evf2, Xist), where it remodels nucleosomes to enable or prevent transcription factor binding, RNA polymerase II loading, and enhancer–promoter looping [PMID:11238380, PMID:15286705, PMID:29792595, PMID:26138476, PMID:30664740, PMID:34260936]. Protein stability is regulated by CK1δ/SCFFBW7- and AKT/GSK3β/FBXW7-mediated ubiquitin-proteasomal degradation and by OTUD6A-catalyzed K27-linked deubiquitination, while CaMKII-dependent phosphorylation modulates BRG1 interactions with the NuRD repressor and cohesin to govern neuronal activity-dependent enhancer activation [PMID:30177679, PMID:30496141, PMID:35233061, PMID:34260936]. Cancer-associated ATPase-domain missense mutations act dominantly to collapse chromatin accessibility at active enhancers genome-wide, and BRG1 loss rewires cellular metabolism by repressing GLUT1 and shifting energy production toward oxidative phosphorylation [PMID:29323272, PMID:37210563].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing that BRG1 exists in multiple biochemically distinct complexes with autonomous ATPase and nucleosome-remodeling activities resolved how a single catalytic subunit can serve both activating and repressive chromatin functions, including through incorporation of the mSin3A corepressor.\",\n      \"evidence\": \"Epitope-tagged affinity purification and in vitro nucleosome remodeling/ATPase assays from human cells\",\n      \"pmids\": [\"11238380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subunit composition differences between the two BRG1 complexes were not fully resolved\", \"Whether distinct complexes act at distinct genomic loci was untested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstration that LKB1 physically binds BRG1 and stimulates its ATPase activity, with kinase-dead LKB1 blocking BRG1-mediated growth arrest, established the first signaling input that directly modulates BRG1 catalytic output.\",\n      \"evidence\": \"In vitro binding and ATPase assay, dominant-negative LKB1 in SW13 cells\",\n      \"pmids\": [\"11445556\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation site on BRG1 by LKB1 was not identified\", \"In vivo relevance of LKB1-BRG1 axis in tumor suppression not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showing that BRG1 directly binds the p21 promoter and induces growth arrest through p21/p15 upregulation and CDK2 inhibition—and that STAT3 recruits BRG1 to remodel chromatin at p21—established a mechanistic link between SWI/SNF recruitment by transcription factors and cell cycle control.\",\n      \"evidence\": \"BRG1 reintroduction in BRG1-null breast tumor cells, ChIP, co-IP/kinase assay; parallel study with STAT3 co-IP and restriction enzyme accessibility\",\n      \"pmids\": [\"14673169\", \"15286705\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BRG1-STAT3 interaction is direct or bridged through other SWI/SNF subunits was unclear\", \"Genome-wide scope of STAT3-directed BRG1 targeting was not assessed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery that BRG1-mediated nucleosome disruption at the CSF1 promoter induces Z-DNA formation, and that both events cooperate for effective remodeling, revealed an unexpected structural DNA consequence of SWI/SNF activity.\",\n      \"evidence\": \"Nucleosome positioning and Z-DNA formation assays at CSF1 locus\",\n      \"pmids\": [\"16537901\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality of Z-DNA formation during BRG1 remodeling at other loci unknown\", \"No structural basis for how remodeling promotes Z-DNA\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Conditional vascular deletion of Brg1 combined with pharmacological β-catenin rescue demonstrated that BRG1 maintains canonical Wnt signaling by controlling Frizzled receptor transcription—the first in vivo epistasis experiment placing BRG1 upstream of a developmental signaling pathway.\",\n      \"evidence\": \"Endothelial conditional knockout mouse, pharmacological β-catenin stabilization rescue\",\n      \"pmids\": [\"21262838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BRG1 directly remodels chromatin at Frizzled gene promoters or acts indirectly was not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Genome-wide ChIP-seq across six embryonic tissues showing BRG1 occupancy at both active (H3K27ac) and repressed (H3K27me3) regulatory elements established the dual activator/repressor role of BRG1 at distal enhancers in vivo, while parallel work in NSCLC showed that BRG1 loss alters nucleosome positioning at TSS regions of cancer genes.\",\n      \"evidence\": \"ChIP-seq with histone mark profiling in mouse embryonic tissues; nucleosome positioning analysis after BRG1 knockdown in NSCLC cells\",\n      \"pmids\": [\"24752179\", \"25115300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which BRG1 is targeted to repressive elements was not determined\", \"Causal relationship between nucleosome repositioning and gene expression changes was correlative\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of Evf2 lncRNA as a direct inhibitor of BRG1 ATPase activity that paradoxically increases BRG1 genomic occupancy via a DLX1-containing RNP established lncRNA-mediated regulation of SWI/SNF catalysis, paralleling subsequent work showing Xist similarly inhibits BRG1 to enforce X-chromosome inactivation.\",\n      \"evidence\": \"In vitro ATPase inhibition, RNA-IP, ChIP; later Xist in vitro inhibition and ChIP-seq/Hi-C on Xi\",\n      \"pmids\": [\"26138476\", \"30664740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RNA-binding domain on BRG1 not structurally defined\", \"Whether other lncRNAs use the same mechanism is unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Structural and biochemical characterization of BRG1's bromodomain revealed an unexpected DNA-binding activity through a basic patch, with multivalent contacts to AT-rich DNA driving nucleosome association more than acetyl-histone recognition, redefining how SWI/SNF ATPases engage their substrate.\",\n      \"evidence\": \"NMR, ITC, fluorescence binding, mutagenesis, nucleosome binding assays, ChIP in mouse ESCs\",\n      \"pmids\": [\"28706277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of bromodomain DNA-binding to locus-specific targeting in differentiated cells untested\", \"Structural model of full bromodomain–nucleosome complex not available\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that cancer-associated ATPase-domain missense mutations dominantly collapse H3K27ac at thousands of enhancers (including superenhancers) while retaining H3K4me1 revealed a gain-of-function mechanism for SMARCA4 mutations in oncogenesis, distinct from simple loss of function.\",\n      \"evidence\": \"ATPase mutagenesis, ATAC-seq, ChIP-seq for histone marks, gene expression profiling\",\n      \"pmids\": [\"29323272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for dominant-negative poisoning of the complex not resolved\", \"Whether mutant BRG1 traps on chromatin or prevents wild-type complex assembly is unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Hi-C analysis after BRG1 depletion showed reduced TAD boundary strength and altered long-range interactions, linking SWI/SNF remodeling activity to three-dimensional genome organization through nucleosome occupancy changes at CTCF sites.\",\n      \"evidence\": \"BRG1 knockdown, Hi-C, ChIP\",\n      \"pmids\": [\"28060558\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether BRG1 directly remodels nucleosomes at CTCF sites or acts indirectly was not distinguished\", \"Causal chain from nucleosome remodeling to cohesin/CTCF-mediated looping was speculative\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovery that CK1δ phosphorylates BRG1 at Ser31/Ser35 to create a degron recognized by SCFFBW7, mediating proteasomal degradation, established the first defined post-translational degradation pathway for BRG1 and connected its protein stability to gastric cancer metastasis.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, phosphorylation mapping, siRNA rescue, clinical samples\",\n      \"pmids\": [\"30177679\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CK1δ-BRG1 phosphorylation is signal-regulated was not addressed\", \"Interplay between SCFFBW7 and the AKT/GSK3β/FBXW7 axis described later was not integrated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Genome-wide ATAC-seq and ChIP-seq showing that BRG1 pre-occupies glucocorticoid receptor binding sites before hormone, maintaining accessible chromatin required for pioneer factor (FOXA1, GATA3) recruitment, redefined BRG1 as a chromatin priming factor rather than solely a hormone-responsive coactivator.\",\n      \"evidence\": \"BRG1 knockdown, ChIP-seq, ATAC-seq in human breast cancer cells\",\n      \"pmids\": [\"29792595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How BRG1 is initially recruited to GR sites before hormone stimulus is unknown\", \"Whether BRG1 priming is a general mechanism at other nuclear receptor loci was not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"PTEN loss was shown to stabilize BRG1 through inhibition of the AKT/GSK3β/FBXW7 degradation pathway, creating a synthetic-lethal dependency on BRG1 in PTEN-null prostate cancer, integrating SWI/SNF stability with PI3K-pathway oncogenesis.\",\n      \"evidence\": \"Genetically engineered mice, organoids, co-IP, protein stability assays, BRG1 antagonist in vivo\",\n      \"pmids\": [\"30496141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same degradation axis operates in all tissue contexts is unknown\", \"Precise ubiquitin chain type in the AKT/GSK3β/FBXW7 axis was not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovery that BRG1-containing SWI/SNF complexes physically interact with the RPA complex, and that BRG1 loss increases replication origin firing through CDC6 upregulation, established an unexpected role for SWI/SNF in suppressing replication stress, explaining sensitivity of BRG1-deficient cancers to ATR inhibitors.\",\n      \"evidence\": \"Quantitative mass spectrometry, co-IP, DNA fiber assay, ATR inhibitor sensitivity in lung cancer\",\n      \"pmids\": [\"32690724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism by which BRG1 suppresses CDC6-mediated origin licensing is unclear\", \"Whether replication-stress role is SWI/SNF-complex-dependent or BRG1-autonomous is untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"CaMKII-dependent phosphorylation of BRG1 was shown to modulate its interactions with NuRD and cohesin, controlling enhancer–promoter looping and enhancer RNA production in neurons, revealing how neuronal activity signals are transduced into chromatin remodeling changes.\",\n      \"evidence\": \"Knockin mice (phospho-null and phosphomimic BRG1), ChIP-seq, co-IP, behavioral phenotyping\",\n      \"pmids\": [\"34260936\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the phosphorylation site(s) relative to other known regulatory sites not fully mapped\", \"Whether CaMKII regulation of BRG1 operates outside neurons is unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of OTUD6A as a deubiquitinase that stabilizes BRG1 by removing K27-linked polyubiquitin chains established a counterbalancing stabilization mechanism opposing SCFFBW7-mediated degradation.\",\n      \"evidence\": \"Mass spectrometry substrate screen, linkage-specific ubiquitination assays, catalytic-dead OTUD6A mutant, in vivo mouse models\",\n      \"pmids\": [\"35233061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether K27-linked ubiquitin is the chain type added by SCFFBW7 or a different E3 was not resolved\", \"Regulatory signals that control OTUD6A activity toward BRG1 are unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that SMARCA4/2 loss represses GLUT1, shifting metabolism from glycolysis to OXPHOS fueled by glutamine via SLC38A2, revealed that SWI/SNF controls metabolic gene accessibility and creates targetable metabolic vulnerabilities in SWI/SNF-mutant cancers.\",\n      \"evidence\": \"SMARCA4/2 KO, metabolic flux and glucose uptake assays, gene expression profiling, patient-derived xenografts\",\n      \"pmids\": [\"37210563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BRG1 directly remodels chromatin at the GLUT1 locus or acts indirectly is not shown\", \"Contribution of SMARCA2 loss versus SMARCA4 loss individually to the metabolic phenotype was not fully deconvolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis for how cancer-associated ATPase mutations dominantly poison the SWI/SNF complex; the full repertoire and specificity of lncRNAs that regulate BRG1 catalysis; integration of the multiple post-translational stability and activity signals (CK1δ, CaMKII, AKT/GSK3β, OTUD6A) into a unified regulatory logic; and the direct mechanism by which BRG1 suppresses replication stress through RPA interaction.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No cryo-EM or crystal structure of disease-mutant SWI/SNF complex on nucleosome\", \"Systematic identification of all regulatory lncRNAs for BRG1 lacking\", \"Integrated model of BRG1 stability regulation across tissue contexts absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 1, 9, 19]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [9, 19]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 3, 6, 8, 14]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 8, 14, 22]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [8, 19, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 4, 7, 8, 12, 14, 19, 22]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 3, 6, 8, 14, 17]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 2, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 16, 18]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [7, 11, 12, 24]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [15, 18, 23]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"complexes\": [\n      \"SWI/SNF (BAF)\",\n      \"SWI/SNF (PBAF)\",\n      \"mSin3A-containing SWI/SNF\"\n    ],\n    \"partners\": [\n      \"ARID1A\",\n      \"LKB1\",\n      \"STAT3\",\n      \"DLX1\",\n      \"FBW7\",\n      \"OTUD6A\",\n      \"RPA1\",\n      \"CTNNB1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"SMARCA4 (BRG1) is the catalytic ATPase subunit of mammalian SWI/SNF (BAF/PBAF) chromatin-remodeling complexes, coupling ATP hydrolysis to nucleosome displacement to regulate transcription, enhancer accessibility, DNA replication, and higher-order chromatin architecture. Together with a core of INI1, BAF155, and BAF170, BRG1 reconstitutes near-complete nucleosome remodeling activity, and combinatorial assembly of tissue-specific BAF subunits diversifies the complex for developmental and cell-type-specific gene programs including embryonic stem cell pluripotency and vascular endothelial identity [PMID:10078207, PMID:19279220, PMID:23406903]. BRG1 is recruited to target loci through interactions with transcription factors (RB, BRCA1, STAT3, β-catenin/TERT, glucocorticoid receptor pioneer factors FOXA1/GATA3, SOX10) and its own bromodomain-AT-hook DNA-binding module, while its activity is post-translationally regulated by CK1δ/FBW7-mediated ubiquitin-proteasomal degradation, OTUD6A deubiquitination, CaMKII phosphorylation, and direct inhibition by lncRNAs Xist and Evf2 [PMID:7923370, PMID:29792595, PMID:30177679, PMID:35233061, PMID:34260936, PMID:30664740]. Inactivating mutations cause dominant-negative loss of chromatin accessibility at active enhancers, aberrant H3K27me3 accumulation, replication stress with RPA-complex engagement, and metabolic rewiring toward glutamine/OXPHOS dependency, creating therapeutic vulnerabilities to ATR inhibition, KDM6 inhibition, and glutamine-transport competition [PMID:29323272, PMID:32690724, PMID:34262032, PMID:37210563].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Establishing BRG1 as a functional SWI2/SNF2 ATPase homolog answered whether mammals possess a catalytic chromatin-remodeling enzyme equivalent to yeast SWI2, and showed its ATPase activity is essential for transcriptional function.\",\n      \"evidence\": \"Yeast complementation with chimeric SWI2/BRG1, ATPase-dead K→R mutation abolishes activity in yeast and human cells\",\n      \"pmids\": [\"8232556\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No mammalian complex partners yet identified\", \"No nucleosome substrate assay performed\", \"Mechanism of transcriptional activation unknown\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Demonstrating that BRG1 physically and functionally cooperates with the retinoblastoma protein RB linked chromatin remodeling to cell cycle control, answering how SWI/SNF activity intersects with tumor suppression.\",\n      \"evidence\": \"Yeast two-hybrid and reciprocal co-IP showing RB pocket–BRG1 interaction; disruption by E1A or RB-binding motif mutation abolishes growth arrest in SW13 cells\",\n      \"pmids\": [\"7923370\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Target genes of RB-BRG1 complex unidentified\", \"In vivo relevance untested\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Purification and functional characterization of the mammalian BAF complex established BRG1 as the ATPase engine of a multi-subunit nucleosome remodeling machine with cell-type-variable composition.\",\n      \"evidence\": \"Affinity purification of 9–12 subunit BAF complex; in vitro nucleosome disruption and transcription factor access assays; demonstration that BRG1 and BRM reside in separate complexes\",\n      \"pmids\": [\"8895581\", \"8804307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Minimal functional core not yet defined\", \"Structural basis of subunit assembly unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Reconstitution of the minimal functional core (BRG1 + INI1 + BAF155 + BAF170) resolved which subunits are necessary and sufficient for nucleosome remodeling activity.\",\n      \"evidence\": \"In vitro nucleosome remodeling with purified recombinant proteins\",\n      \"pmids\": [\"10078207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role of accessory subunits (BAF60, BAF53, β-actin) in modulating activity not fully characterized\", \"No structural model of assembled core\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of the RB–BRG1–HDAC repressor complex at cyclin E/A promoters and the BRCA1–BRG1 interaction established that BRG1 functions as both a transcriptional activator and repressor depending on its co-recruited partners.\",\n      \"evidence\": \"Co-IP and ChIP showing RB–BRG1–HDAC complex persists after CDK4 phosphorylation at cyclin A/CDC2 promoters; BRCA1 copurifies with BRG1 and requires it for p53-dependent transactivation\",\n      \"pmids\": [\"10778858\", \"10943845\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide scope of repressive vs. activating BRG1 occupancy unknown\", \"How BRCA1 directs BRG1 to specific loci unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"BRG1 reintroduction into BRG1-deficient tumor cells demonstrated that BRG1 directly activates CDK inhibitor genes (p21, p15) and cooperates with STAT3 to open chromatin and enable transcriptional elongation, providing a mechanistic basis for its tumor-suppressive function.\",\n      \"evidence\": \"BRG1 rescue in ALAB breast cancer cells upregulates p21/p15 and suppresses E2F targets; STAT3 recruits BRG1 to p21 promoter enabling H3 acetylation and Pol II CTD-Ser2 phosphorylation\",\n      \"pmids\": [\"14673169\", \"15286705\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of BRG1's remodeling vs. scaffolding role at these loci not dissected\", \"STAT3–BRG1 interaction based on single-lab co-IP\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that TERT recruits BRG1 to β-catenin target gene promoters and that embryonic stem cells assemble a specialized esBAF complex revealed BRG1 as a central node linking Wnt signaling, telomerase biology, and pluripotency maintenance.\",\n      \"evidence\": \"TERT–BRG1 co-IP plus ChIP at Wnt target promoters in Xenopus and mouse; quantitative proteomics defining esBAF (BRG1-exclusive, BAF155-only) required for ES cell self-renewal\",\n      \"pmids\": [\"19571879\", \"19279220\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TERT enzymatic activity is required for the BRG1 interaction unclear\", \"How esBAF is disassembled during differentiation not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Endothelial conditional knockout revealed BRG1 controls vascular Wnt signaling at two levels—Wnt receptor transcription and β-catenin target gene activation—and subsequently showed BRG1 specifies venous identity via COUP-TFII chromatin remodeling.\",\n      \"evidence\": \"Conditional Brg1 deletion in embryonic endothelium; pharmacological β-catenin rescue; ChIP at COUP-TFII regulatory elements\",\n      \"pmids\": [\"21262838\", \"23406903\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals that activate BRG1 in endothelial cells unknown\", \"Arterio-venous BRG1 regulatory mechanisms not dissected at single-cell level\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Genome-wide ChIP-seq in embryonic tissues demonstrated that BRG1 predominantly occupies tissue-specific distal regulatory elements (enhancers) carrying both active (H3K27ac) and repressive (H3K27me3) marks, redefining BRG1 as a dual-function enhancer regulator.\",\n      \"evidence\": \"FLAG knock-in ChIP-seq across multiple embryonic tissues with histone mark co-mapping and transgenic enhancer validation\",\n      \"pmids\": [\"24752179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How BRG1 switches between activating and repressive states at the same locus not resolved\", \"Whether all distal sites require ATPase activity unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Structural and functional dissection of the BRG1 bromodomain revealed multivalent DNA and H3K14ac binding, while cancer-associated ATPase mutations were shown to act as dominant negatives depleting chromatin accessibility at active enhancers genome-wide.\",\n      \"evidence\": \"NMR/ITC of bromodomain–DNA and bromodomain–H3K14ac interactions; ATAC-seq/ChIP-seq in cells expressing heterozygous dominant-negative ATPase-dead BRG1\",\n      \"pmids\": [\"28706277\", \"29323272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length BRG1 structural model absent\", \"Whether dominant-negative effect operates through poison-subunit incorporation into all BAF subtypes untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of the CK1δ–FBW7 ubiquitin-dependent degradation pathway for BRG1, and the PTEN/AKT/GSK3β axis that stabilizes BRG1 in prostate cancer, established post-translational proteolysis as a major regulatory layer controlling BRG1 protein levels.\",\n      \"evidence\": \"In vitro kinase assay (CK1δ phosphorylates Ser31/35), ubiquitination assay, mutagenesis; PTEN-loss stabilizes BRG1 via AKT/GSK3β/FBXW7 inhibition in genetically engineered mice and organoids\",\n      \"pmids\": [\"30177679\", \"30496141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other E3 ligases target BRG1 unknown\", \"Tissue-specific regulation of BRG1 turnover not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstration that lncRNAs Xist and Evf2 directly bind and inhibit BRG1 ATPase/remodeling activity introduced RNA-mediated regulation as a mechanism for silencing BRG1 at specific genomic loci, including the inactive X chromosome.\",\n      \"evidence\": \"In vitro ATPase and remodeling assays with purified BRG1 and RNA; Xist deletion restores BRG1 binding to Xi with consequent TAD/superloop formation; Evf2 converts active enhancers to repressed state in developing forebrain\",\n      \"pmids\": [\"30664740\", \"26138476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RNA-binding domain of BRG1 not structurally resolved\", \"Scope of regulatory lncRNAs beyond Xist and Evf2 unexplored\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"BRG1 loss was found to cause replication stress through deregulated CDC6-mediated origin firing, with BRG1-containing complexes physically engaging RPA, revealing a non-transcriptional role in replication fork stability.\",\n      \"evidence\": \"Single-molecule DNA fiber analysis, quantitative MS interactome, co-IP of BRG1–RPA; selective ATR inhibitor sensitivity of BRG1-deficient lung cancer\",\n      \"pmids\": [\"32690724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanistic link between chromatin remodeling and origin licensing not established\", \"Whether the RPA interaction is BAF- or PBAF-specific unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"CaMKII-dependent phosphorylation of BRG1 in neurons was shown to alter its interactions with NuRD and cohesin, governing activity-dependent enhancer activation and behavior, revealing a signaling-responsive switch for BRG1 function.\",\n      \"evidence\": \"Phospho-site knockin mice; co-IP showing phosphorylation-dependent NuRD/cohesin interaction changes; ChIP-seq and RNA-seq; anxiety-like behavioral phenotype\",\n      \"pmids\": [\"34260936\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase(s) responsible for basal BRG1 phosphorylation at other sites not identified\", \"Whether phosphorylation alters BAF complex composition in neurons untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"OTUD6A was identified as a deubiquitinase that stabilizes BRG1 by removing K27-linked polyubiquitin chains, complementing the FBW7-mediated degradation axis and revealing bidirectional ubiquitin regulation of BRG1 levels.\",\n      \"evidence\": \"MS screen, co-IP, in vitro and cellular ubiquitination assays, xenograft/PDX validation\",\n      \"pmids\": [\"35233061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether OTUD6A targets BRG1 in all tissues or is context-specific unknown\", \"Interplay between K27-linked and K48-linked ubiquitination on BRG1 uncharacterized\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"SMARCA4 loss was shown to rewire cellular metabolism by repressing GLUT1, reducing glycolysis, and creating dependency on glutamine import via SLC38A2 for OXPHOS, identifying a metabolic vulnerability exploitable by alanine competition.\",\n      \"evidence\": \"CRISPR KO, metabolic flux assays, glucose uptake measurements, RNA-seq, alanine supplementation in PDX models\",\n      \"pmids\": [\"37210563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether metabolic rewiring occurs in all SMARCA4-mutant cancer types unknown\", \"Direct chromatin mechanism linking BRG1 to GLUT1 transcription not fully delineated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Outstanding questions include the high-resolution cryo-EM structure of full-length BRG1 within assembled BAF and PBAF complexes, the complete catalog of regulatory lncRNAs that modulate BRG1 activity, the mechanistic basis by which BRG1 switches between activating and repressive functions at the same enhancer, and whether the replication-fork-protective role of BRG1 operates through direct chromatin remodeling at origins or through an independent scaffolding function.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Full-length BRG1 cryo-EM structure in BAF/PBAF context not yet available\", \"Systematic identification of regulatory RNAs targeting BRG1 not performed\", \"Remodeling-independent scaffolding functions not formally dissected from ATPase-dependent roles\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 4, 5, 19, 23, 29]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [22]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 6, 11, 12, 14, 17, 25]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [19, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2, 18, 25]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [18, 29]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [18, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [2, 5, 18, 23, 29]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 6, 11, 12, 17, 25]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 6, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [14, 16, 26]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [15, 17, 19]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [31]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [24, 35]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [23, 33, 36]}\n    ],\n    \"complexes\": [\n      \"BAF (SWI/SNF-A)\",\n      \"PBAF (SWI/SNF-B)\",\n      \"esBAF\"\n    ],\n    \"partners\": [\n      \"RB1\",\n      \"BRCA1\",\n      \"SMARCB1\",\n      \"SMARCC1\",\n      \"SMARCC2\",\n      \"TERT\",\n      \"CTNNB1\",\n      \"ARID1A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}