{"gene":"BAZ1A","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":1999,"finding":"ACF consists of two subunits, Acf1 (Drosophila ortholog of BAZ1A) and ISWI, that function synergistically in ATP-dependent chromatin assembly; ISWI alone has ~3% of ACF activity, indicating Acf1 confers additional functionality to the ISWI motor. Acf1 contains two PHD fingers, one bromodomain, and WAC/DDT conserved regions.","method":"Biochemical purification, reconstitution of recombinant two-subunit complex, in vitro chromatin assembly assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified components, quantitative activity assay, replicated across multiple preparations","pmids":["10385622"],"is_preprint":false},{"year":2001,"finding":"Acf1 (Drosophila BAZ1A ortholog) is the p175 subunit of CHRAC; its interaction with ISWI enhances nucleosome sliding efficiency ~10-fold and qualitatively modulates ISWI by altering directionality of nucleosome movements and histone tail requirements. CHRAC is molecularly defined as ISWI, Acf1, CHRAC-14, and CHRAC-16.","method":"Biochemical purification, reconstitution, in vitro nucleosome sliding assay, mass spectrometry identification","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with quantitative nucleosome sliding assays, multiple orthogonal methods including MS identification","pmids":["11447119"],"is_preprint":false},{"year":2002,"finding":"ACF1-SNF2H (ISWI) complex specifically localizes to replicating pericentromeric heterochromatin; RNAi depletion of ACF1 specifically impairs replication of pericentromeric heterochromatin and delays cell-cycle progression through late S phase. An ACF1 mutant unable to interact with SNF2H also interferes with condensed chromatin replication.","method":"RNAi depletion, BrdU incorporation/immunofluorescence localization, flow cytometry cell-cycle analysis, domain mutant expression","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi loss-of-function with specific heterochromatin replication phenotype, localization studies, mutant validation, multiple orthogonal readouts","pmids":["12434153"],"is_preprint":false},{"year":2002,"finding":"Acf1 (Drosophila BAZ1A ortholog) binds DNA through a WAC motif in its N-terminus; interacts with ISWI through a DDT domain; an acidic region likely contacts histones during deposition. All three regions are required for full chromatin assembly activity of ACF.","method":"Systematic deletion/point mutagenesis of Acf1 domains, DNA-binding assays, in vitro chromatin assembly assay, ATPase assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic mutagenesis with in vitro biochemical assays, multiple domain mutants tested","pmids":["12192034"],"is_preprint":false},{"year":2000,"finding":"Human ACF1 (hACF1/BAZ1A) is a subunit of human CHRAC (HuCHRAC), which also contains SNF2H (ISWI isoform) and two histone-fold proteins (human orthologs of CHRAC-14/16). The two small histone-fold proteins form a stable sub-complex that binds naked DNA but not nucleosomes.","method":"Biochemical purification of HuCHRAC, co-purification/co-immunoprecipitation, DNA binding assay","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical purification with co-purification evidence, single lab, functional sub-complex characterization","pmids":["10880450"],"is_preprint":false},{"year":2004,"finding":"Deletion of the C-terminal PHD finger modules of ACF1 (Drosophila BAZ1A ortholog), or their disruption by zinc chelation, profoundly reduces nucleosome mobilization by associated ISWI. PHD fingers of ACF1 interact with core histone central domains, contributing to ACF nucleosome substrate binding.","method":"Domain deletion mutagenesis, in vitro nucleosome mobilization assay, zinc chelation, nucleosome binding assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with in vitro reconstitution and quantitative nucleosome mobilization assays, multiple orthogonal approaches","pmids":["15457208"],"is_preprint":false},{"year":2004,"finding":"Loss of Acf1 (Drosophila BAZ1A ortholog) in vivo decreases periodicity and repeat length of nucleosome arrays in bulk chromatin, compromises transcriptional silencing in pericentric heterochromatin and Polycomb-dependent repression, and accelerates S-phase progression. ACF/CHRAC promotes formation (not disruption) of repressive chromatin in vivo. Genetic interaction with nap1 (NAP-1 histone chaperone) confirmed.","method":"Drosophila Acf1 null genetics, micrococcal nuclease nucleosome ladder analysis, position effect variegation assay, flow cytometry, genetic epistasis with nap1","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo null genetics with multiple orthogonal phenotypic readouts and genetic epistasis, replicated across developmental stages","pmids":["14752009"],"is_preprint":false},{"year":2006,"finding":"Human ACF1 (hACF1/BAZ1A) alters the remodeling strategy of SNF2h: it changes the DNA overhang requirement for nucleosome remodeling and alters the DNA accessibility profile of remodeled products, likely contributing to nucleosome spacing efficiency.","method":"Reconstitution of hACF complex, in vitro nucleosome remodeling assay with defined DNA overhang substrates, restriction enzyme accessibility assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted complex with systematic substrate variation and quantitative in vitro assays, single lab","pmids":["16877760"],"is_preprint":false},{"year":2007,"finding":"Human Acf1 (BAZ1A) interacts with nuclear receptor corepressor N-CoR (identified by yeast two-hybrid); hAcf1 is required for stabilizing the VDR-N-CoR repression complex at target gene promoters (IGFBP3, RANKL). Hormone (vitamin D3) treatment releases hAcf1 from target promoters, and hAcf1 depletion alters histone modification profiles (H3/H4) and histone occupancy at these genes.","method":"Yeast two-hybrid, ChIP, RNAi knockdown, histone modification analysis","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus ChIP and RNAi with multiple chromatin readouts, single lab","pmids":["17519354"],"is_preprint":false},{"year":2008,"finding":"ACF1 (Drosophila BAZ1A ortholog) and ISWI are required for basal repression of Wingless/Wnt target genes in Drosophila; ISWI localizes to Wg target gene chromatin at TCF binding sites while ACF1 distributes more broadly in a manner dependent on ISWI; they are required for TCF binding to chromatin and repress targets by antagonizing histone H4 acetylation. Wingless signaling reduces ACF1 binding to Wg target loci.","method":"Drosophila genetics (RNAi), ChIP, reporter assays, histone acetylation analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus genetic RNAi with multiple readouts, single lab, Drosophila model","pmids":["18786525"],"is_preprint":false},{"year":2010,"finding":"ACF1 (BAZ1A) and SNF2H rapidly accumulate at DNA double-strand breaks (DSBs) and are required for DSB repair in human cells. ACF1 directly interacts with KU70 and is required for KU70/80 accumulation at DSBs. The CHRAC complex (ACF1, SNF2H, CHRAC15, CHRAC17) becomes more associated with chromatin after DSB-inducing treatments. Depletion of either ACF1 or SNF2H significantly reduces both NHEJ and HR frequencies.","method":"Co-immunoprecipitation, laser microirradiation with live-cell imaging, RNAi knockdown, NHEJ/HR reporter assays, clonogenic survival","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying direct KU70 interaction, RNAi with quantitative NHEJ/HR reporter assays, live-cell localization, multiple orthogonal approaches","pmids":["21172662"],"is_preprint":false},{"year":2011,"finding":"hACF1 (BAZ1A) and SNF2H accumulate at laser-induced DNA damage sites; depletion of hACF1 compromises the G2/M checkpoint activated by UV and X-rays, reduces γH2AX and CHK2 phosphorylation signals, increases apoptosis, and causes cells to enter mitosis despite unresolved replication stress lesions (aphidicolin model), resulting in metaphase chromosome breaks.","method":"RNAi depletion, laser microirradiation/immunofluorescence, flow cytometry (cell cycle), γH2AX/CHK2ph immunofluorescence, clonogenic survival","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi loss-of-function with multiple checkpoint readouts, single lab, multiple orthogonal methods","pmids":["21745822"],"is_preprint":false},{"year":2017,"finding":"The PHD domain of BAZ1A (but not BAZ1B) has the non-canonical function of binding DNA. The BAZ1A bromodomain has a non-canonical gatekeeper residue and binds acetylated histone peptides relatively weakly. Both BAZ1A and BAZ1B recruit SMARCA5 to sites of DNA damage; structure-designed bromodomain and PHD mutants impair DNA damage recovery by disrupting ISWI factor loading at lesions.","method":"CRISPR-Cas9 genome editing, crystal structure determination, in vitro binding assays (DNA and acetyl-histone peptide), cell survival assays, structure-based mutagenesis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure determination combined with CRISPR-engineered mutants, in vitro binding assays, and cellular functional readouts","pmids":["29021563"],"is_preprint":false},{"year":2016,"finding":"ACF1 expression is under strict developmental control in Drosophila, persisting at high levels in undifferentiated cells (germ cell precursors, larval neuroblasts); constitutive expression is lethal. Cell-specific ectopic ACF1 expression perturbs chromatin organization. ACF1-containing factors are involved in the initial establishment of heterochromatin structures during development.","method":"Immunostaining, transgenic expression, developmental staging, chromatin organization analysis","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization/expression experiments with gain-of-function lethality phenotype, single lab","pmids":["20843858"],"is_preprint":false},{"year":2022,"finding":"BAZ1A/ACF1 is recruited to UV-damaged chromatin in an MLL1-dependent manner: HBO1 interacts with DDB2 at UV lesions, maintains phosphorylated MLL1 at those sites, and MLL1 catalyzes H3K4 methylation that recruits BAZ1A. Depletion of MLL1 suppresses BAZ1A accumulation at UV-irradiated sites and inhibits CPD removal, placing BAZ1A downstream of the DDB2-HBO1-MLL1 axis in global genome NER.","method":"ChIP, immunofluorescence at UV-irradiated sites, RNAi depletion, CPD removal assay","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and localization assays with RNAi epistasis establishing pathway order, single lab","pmids":["35940372"],"is_preprint":false},{"year":2024,"finding":"ACF1 (BAZ1A) and SMARCA5 each accumulate at DNA breaks independently of each other in an ADP-ribosylation-dependent manner; their recruitment is not due to direct binding to ADP-ribose moieties but is facilitated by DNA binding at relaxed (ADP-ribosylated) chromatin.","method":"Live-cell imaging, laser microirradiation, ADP-ribosylation inhibitors, FRAP, domain mutant analysis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell imaging with pharmacological and genetic dissection, single lab, multiple approaches","pmids":["38170578"],"is_preprint":false},{"year":2019,"finding":"BAZ1A knockdown induces cellular senescence phenotypes; mechanistically, BAZ1A depletion upregulates SMAD3, which in turn activates transcription of the p21-encoding gene CDKN1A, causing senescence-associated phenotypes in human cancer cells.","method":"shRNA knockdown, SA-β-Gal staining, EdU incorporation, CCK-8 assay, gene expression analysis","journal":"Life sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, indirect pathway placement via gene expression changes without direct chromatin mechanistic experiments","pmids":["31085244"],"is_preprint":false},{"year":2025,"finding":"USP10 physically interacts with BAZ1A, deubiquitinates it, and stabilizes BAZ1A protein levels. BAZ1A complexes with SOX2 to drive enhancer-promoter interactions and recruit BRD4, thereby activating cancer stem cell-related gene expression programs in head and neck squamous cell carcinoma.","method":"Co-immunoprecipitation, ubiquitination assay, chromatin immunoprecipitation (ChIP), gene expression analysis","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying deubiquitination and complex formation, ChIP for enhancer-promoter interactions, single lab","pmids":["40204721"],"is_preprint":false},{"year":2024,"finding":"BAZ1A interacts with E2F1; BAZ1A, E2F1, and SMARCA1/5 form a complex that binds the E2F1 promoter. BAZ1A depletion reduces DNaseI sensitivity at E2F1 binding regions of the E2F1 promoter and reduces E2F1-dependent transcription, leading to G1-phase arrest. ChIP-ReChIP confirmed co-occupancy of BAZ1A-bound chromatin by E2F1 at specific E2F1 promoter sites.","method":"Co-immunoprecipitation, ChIP, ChIP-ReChIP, DNaseI sensitivity assay, RNAi knockdown, RNA-seq, orthotopic xenograft","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP-ReChIP co-occupancy and DNaseI accessibility, multiple methods, single lab, preprint not peer-reviewed","pmids":["bio_10.1101_2024.11.20.624462"],"is_preprint":true},{"year":2022,"finding":"BAZ1A localizes to heterochromatin during spermatogenesis and interacts with DICER and major satellite repeat (MSR) chromatin in mouse testes, suggesting a role in heterochromatin regulation in the male germline.","method":"Immunofluorescence, co-immunoprecipitation, ChIP in mouse testis","journal":"Reproduction","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, Co-IP and localization without functional mechanistic follow-up","pmids":["36194437"],"is_preprint":false},{"year":2026,"finding":"NAA20 interacts with ACF1 (BAZ1A), promotes its lactylation (enhanced by lactate), and this modification drives nuclear translocation of ACF1. Lactylated ACF1 increases H3K27ac and H3K4me3 at the GCLM promoter, recruiting Myc and activating GCLM-dependent glutathione synthesis in neuroblastoma.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), luciferase assay, immunofluorescence, RNAi knockdown, xenograft models","journal":"Cell biology and toxicology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, new post-translational modification (lactylation) identified by Co-IP and ChIP, no in vitro reconstitution of modification","pmids":["41644856"],"is_preprint":false},{"year":2025,"finding":"In yeast, the WAC-downWAC module (N-terminal region of Itc1, the BAZ1A ortholog) forms a conserved structural module predicted to interact with DNA; deletion of this module abolishes ISW2 complex function at target genes (nucleosome positioning at +1 positions) without affecting global nucleosome organization, functionally equivalent to a null allele.","method":"Yeast genetics, genome-wide nucleosome mapping (MNase-seq), structural prediction, growth assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide nucleosome mapping with defined deletion mutant, multiple genetic backgrounds tested, preprint","pmids":["bio_10.1101_2025.04.27.650761"],"is_preprint":true}],"current_model":"BAZ1A (ACF1/hACF1) is the large non-catalytic subunit of the ISWI-family chromatin remodeling complexes ACF and CHRAC, where it associates with the SNF2H/SMARCA5 ATPase and synergistically enhances nucleosome sliding and spacing ~10-fold through PHD finger contacts with core histones, a WAC/DDT-mediated DNA-binding module, and allosteric modulation of the ATPase remodeling strategy; in the DNA damage response, BAZ1A accumulates at DSBs and UV lesions (the latter via a DDB2-HBO1-MLL1-H3K4me axis), directly interacts with KU70 to promote both NHEJ and HR, supports the G2/M checkpoint, and is recruited to relaxed ADP-ribosylated chromatin independently of its ATPase partner; additionally, BAZ1A represses nuclear receptor-regulated gene expression by stabilizing the VDR-NCoR complex at target promoters, represses Wnt target genes by antagonizing H4 acetylation and supporting TCF chromatin binding, and promotes E2F1-dependent transcription through a BAZ1A-E2F1-SMARCA1/5 complex."},"narrative":{"mechanistic_narrative":"BAZ1A (ACF1/hACF1) is the large non-catalytic subunit of ISWI-family chromatin remodeling complexes ACF and CHRAC, where it associates with the SNF2H/SMARCA5 (ISWI) ATPase and synergistically enhances ATP-dependent nucleosome assembly, sliding, and spacing roughly 10-fold relative to the ATPase alone [PMID:10385622, PMID:11447119]. It contributes to remodeling through distinct modules: a WAC/DDT region that binds DNA and mediates the ISWI interaction, an acidic histone-contacting region, and C-terminal PHD fingers that engage core histone domains to anchor the nucleosome substrate [PMID:12192034, PMID:15457208], and it qualitatively reprograms the SNF2H remodeling strategy by changing DNA-overhang requirements and the accessibility profile of remodeled products [PMID:16877760]; its PHD finger has a non-canonical DNA-binding activity while its bromodomain binds acetylated histones weakly [PMID:29021563]. Through this activity BAZ1A organizes repressive and heterochromatic chromatin: it localizes to and is required for replication of pericentromeric heterochromatin, maintains nucleosome array periodicity, and supports transcriptional silencing [PMID:12434153, PMID:14752009]. In the DNA damage response, BAZ1A and SNF2H rapidly accumulate at double-strand breaks and UV lesions, where BAZ1A directly interacts with KU70 to promote KU70/80 loading and both NHEJ and HR, supports the G2/M checkpoint, and is recruited to relaxed ADP-ribosylated chromatin via DNA binding independently of its ATPase partner [PMID:21172662, PMID:21745822, PMID:38170578]; its recruitment to UV lesions proceeds through a DDB2-HBO1-MLL1-H3K4me axis that delivers BAZ1A for CPD removal in global genome NER [PMID:35940372]. BAZ1A also acts in gene-specific transcriptional regulation, stabilizing the VDR-N-CoR corepressor complex at nuclear-receptor target promoters [PMID:17519354] and forming a BAZ1A-E2F1-SMARCA1/5 complex that opens E2F1 promoter chromatin to drive E2F1-dependent transcription and G1/S progression [PMID:bio_10.1101_2024.11.20.624462].","teleology":[{"year":1999,"claim":"Established that the ISWI ATPase requires a partner subunit for full activity, identifying Acf1 as the defining accessory subunit that converts the bare motor into a functional chromatin assembly machine.","evidence":"Biochemical purification and reconstitution of recombinant two-subunit ACF with in vitro chromatin assembly assays in Drosophila","pmids":["10385622"],"confidence":"High","gaps":["Did not map which Acf1 domains confer the added activity","Human ortholog not yet characterized"]},{"year":2001,"claim":"Showed Acf1 not only boosts but qualitatively reprograms the ISWI motor, defining CHRAC as a discrete four-subunit complex and explaining the ~10-fold enhancement of nucleosome sliding.","evidence":"Reconstitution and in vitro nucleosome sliding assays with mass spectrometry identification of CHRAC subunits","pmids":["11447119"],"confidence":"High","gaps":["Mechanism by which Acf1 alters directionality not structurally resolved","Role of CHRAC-14/16 histone-fold proteins in the activity change unclear"]},{"year":2000,"claim":"Defined the human complex HuCHRAC, demonstrating that the ACF/CHRAC architecture including hACF1/BAZ1A and SNF2H is conserved in humans.","evidence":"Biochemical purification of HuCHRAC with co-IP and DNA-binding assays","pmids":["10880450"],"confidence":"Medium","gaps":["Single-lab purification","Functional remodeling activity of human complex not yet quantified here"]},{"year":2002,"claim":"Dissected the modular architecture of Acf1, assigning DNA binding to the WAC motif, ISWI interaction to the DDT domain, and histone contact to an acidic region, showing all are needed for assembly.","evidence":"Systematic deletion/point mutagenesis with DNA-binding, chromatin assembly, and ATPase assays","pmids":["12192034"],"confidence":"High","gaps":["PHD finger role not addressed in this study","Structural basis of DDT-ISWI interface not resolved"]},{"year":2002,"claim":"Linked ACF1 remodeling activity to a specific in vivo process by showing it is required for replication of condensed pericentromeric heterochromatin and timely late-S progression.","evidence":"RNAi depletion with BrdU localization, flow cytometry, and SNF2H-interaction mutant in human cells","pmids":["12434153"],"confidence":"High","gaps":["How remodeling facilitates fork progression through heterochromatin not defined","No direct replication-factor interaction mapped"]},{"year":2004,"claim":"Identified the PHD fingers as a substrate-recognition module that contacts core histones and is required for efficient nucleosome mobilization.","evidence":"Domain deletion, zinc chelation, and in vitro nucleosome mobilization/binding assays","pmids":["15457208"],"confidence":"High","gaps":["Histone surface contacted not pinpointed at residue level","Did not test DNA-binding function of PHD"]},{"year":2004,"claim":"Demonstrated in vivo that ACF/CHRAC promotes formation of repressive chromatin, regularizing nucleosome spacing and supporting heterochromatic and Polycomb silencing.","evidence":"Drosophila Acf1 null genetics, MNase nucleosome ladders, position-effect variegation, and nap1 epistasis","pmids":["14752009"],"confidence":"High","gaps":["Direct targets of silencing not mapped genome-wide","Relationship to mammalian heterochromatin not established here"]},{"year":2006,"claim":"Showed human ACF1 changes the remodeling strategy of SNF2h, altering DNA-overhang requirements and product accessibility, providing the biochemical basis for spacing efficiency.","evidence":"Reconstituted hACF with defined-overhang nucleosome substrates and restriction-accessibility assays","pmids":["16877760"],"confidence":"High","gaps":["Single-lab study","Structural mechanism of strategy switch unresolved"]},{"year":2007,"claim":"Extended BAZ1A function beyond remodeling to gene-specific repression by showing it stabilizes the VDR-N-CoR corepressor complex at hormone-responsive promoters.","evidence":"Yeast two-hybrid, ChIP, RNAi, and histone-modification analysis at IGFBP3/RANKL","pmids":["17519354"],"confidence":"Medium","gaps":["Direct vs SNF2H-dependent recruitment not separated","Generality across nuclear receptors untested"]},{"year":2008,"claim":"Connected ACF1/ISWI to developmental signaling by showing they repress Wnt targets via TCF chromatin binding and antagonism of H4 acetylation.","evidence":"Drosophila RNAi, ChIP, reporter and histone-acetylation assays","pmids":["18786525"],"confidence":"Medium","gaps":["Mammalian conservation of Wnt regulation untested","Mechanism linking remodeling to H4 acetylation unclear"]},{"year":2010,"claim":"Placed BAZ1A directly in DSB repair by identifying a direct KU70 interaction that drives KU70/80 loading and promotes both NHEJ and HR.","evidence":"Reciprocal co-IP, laser microirradiation live imaging, RNAi with NHEJ/HR reporters and clonogenic survival","pmids":["21172662"],"confidence":"High","gaps":["How a single factor supports both NHEJ and HR not mechanistically resolved","Remodeling vs scaffolding contribution at breaks not separated"]},{"year":2011,"claim":"Showed BAZ1A is required for the G2/M checkpoint and genome stability under replication stress, linking its damage role to cell-cycle control.","evidence":"RNAi depletion with checkpoint, gammaH2AX/CHK2 phosphorylation, apoptosis, and chromosome-break readouts","pmids":["21745822"],"confidence":"Medium","gaps":["Direct checkpoint-kinase connection not defined","Single-lab study"]},{"year":2017,"claim":"Provided structural basis for BAZ1A's non-canonical reader modules, showing its PHD binds DNA and its bromodomain binds acetyl-histones weakly, both required for ISWI loading at lesions.","evidence":"Crystal structures, CRISPR-engineered mutants, in vitro binding, and cell survival assays","pmids":["29021563"],"confidence":"High","gaps":["Endogenous chromatin marks read at lesions not defined","Relative contributions of PHD-DNA vs bromodomain not quantified in vivo"]},{"year":2022,"claim":"Defined the recruitment pathway for BAZ1A at UV lesions, placing it downstream of a DDB2-HBO1-MLL1-H3K4me axis required for CPD removal in global genome NER.","evidence":"ChIP, immunofluorescence at UV sites, RNAi epistasis, and CPD removal assay","pmids":["35940372"],"confidence":"Medium","gaps":["Direct H3K4me-BAZ1A reading not shown biochemically","Step at which BAZ1A acts in NER unresolved"]},{"year":2024,"claim":"Showed BAZ1A and SMARCA5 are recruited to breaks independently of each other via DNA binding at relaxed ADP-ribosylated chromatin, decoupling BAZ1A recruitment from its ATPase partner.","evidence":"Live-cell imaging, laser microirradiation, ADP-ribosylation inhibitors, FRAP, and domain mutants","pmids":["38170578"],"confidence":"Medium","gaps":["Whether independent recruitment produces functional complexes at breaks unclear","Single-lab study"]},{"year":2024,"claim":"Identified a transcription-activating role for BAZ1A in a BAZ1A-E2F1-SMARCA1/5 complex that opens E2F1 promoter chromatin to drive E2F1-dependent transcription and cell-cycle progression.","evidence":"Co-IP, ChIP-ReChIP co-occupancy, DNaseI sensitivity, RNAi, RNA-seq, and orthotopic xenograft (preprint)","pmids":["bio_10.1101_2024.11.20.624462"],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","How a repressive remodeler activates here mechanistically unclear"]},{"year":2025,"claim":"Identified USP10 as a deubiquitinase that stabilizes BAZ1A, which complexes with SOX2 to drive enhancer-promoter looping and BRD4 recruitment in cancer stem cells.","evidence":"Co-IP, ubiquitination assay, and ChIP in head and neck squamous cell carcinoma","pmids":["40204721"],"confidence":"Medium","gaps":["Direct vs indirect SOX2/BRD4 association not fully separated","Single-lab, disease-specific context"]},{"year":null,"claim":"How BAZ1A switches between its core repressive/heterochromatin-organizing remodeling role and its context-specific transcription-activating and germline/metabolic functions, and what selects between its many partners, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying model integrating remodeling, DDR, and gene-specific roles","Post-translational control (lactylation, deubiquitination) of partner choice uncharacterized","Mammalian heterochromatin/germline functions lack mechanistic depth"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[3,12]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,7]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[8,18]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[10]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,8]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[2,6]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[2,10]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1,5,6]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[10,12,14]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[2]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8,18]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[11,18]}],"complexes":["ACF","CHRAC"],"partners":["SMARCA5","KU70","NCOR1","E2F1","SMARCA1","USP10","SOX2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NRL2","full_name":"Bromodomain adjacent to zinc finger domain protein 1A","aliases":["ATP-dependent chromatin-remodeling protein","ATP-utilizing chromatin assembly and remodeling factor 1","hACF1","CHRAC subunit ACF1","Williams syndrome transcription factor-related chromatin-remodeling factor 180","WCRF180","hWALp1"],"length_aa":1556,"mass_kda":178.7,"function":"Regulatory subunit of the ATP-dependent ACF-1 and ACF-5 ISWI chromatin remodeling complexes, which form ordered nucleosome arrays on chromatin and slide edge- and center-positioned histone octamers away from their original location on the DNA template to facilitate access to DNA during DNA-templated processes such as DNA replication, transcription, and repair (PubMed:17099699, PubMed:28801535). Both complexes regulate the spacing of nucleosomes along the chromatin and have the ability to slide mononucleosomes to the center of a DNA template in an ATP-dependent manner (PubMed:14759371, PubMed:17099699, PubMed:28801535). The ACF-1 ISWI chromatin remodeling complex has a lower ATP hydrolysis rate than the ACF-5 ISWI chromatin remodeling complex (PubMed:28801535). Has a role in sensing the length of DNA which flank nucleosomes, which modulates the nucleosome spacing activity of the ACF-5 ISWI chromatin remodeling complex (PubMed:17099699). Involved in DNA replication and together with SMARCA5/SNF2H is required for replication of pericentric heterochromatin in S-phase (PubMed:12434153). May have a role in nuclear receptor-mediated transcription repression (PubMed:17519354)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9NRL2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BAZ1A","classification":"Not Classified","n_dependent_lines":31,"n_total_lines":1208,"dependency_fraction":0.02566225165562914},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000198604","cell_line_id":"CID001130","localizations":[{"compartment":"chromatin","grade":3}],"interactors":[{"gene":"CHRAC1","stoichiometry":10.0},{"gene":"SMARCA5","stoichiometry":10.0},{"gene":"SMARCA1","stoichiometry":4.0},{"gene":"CSNK2A1","stoichiometry":0.2},{"gene":"H2AFZ","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGA1","stoichiometry":0.2},{"gene":"HMGN2","stoichiometry":0.2},{"gene":"HMGN5","stoichiometry":0.2},{"gene":"MECP2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001130","total_profiled":1310},"omim":[{"mim_id":"618370","title":"NEXN ANTISENSE RNA 1, NONCODING; NEXNAS1","url":"https://www.omim.org/entry/618370"},{"mim_id":"613121","title":"NEXILIN F-ACTIN-BINDING PROTEIN; 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Acf1 contains two PHD fingers, one bromodomain, and WAC/DDT conserved regions.\",\n      \"method\": \"Biochemical purification, reconstitution of recombinant two-subunit complex, in vitro chromatin assembly assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified components, quantitative activity assay, replicated across multiple preparations\",\n      \"pmids\": [\"10385622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Acf1 (Drosophila BAZ1A ortholog) is the p175 subunit of CHRAC; its interaction with ISWI enhances nucleosome sliding efficiency ~10-fold and qualitatively modulates ISWI by altering directionality of nucleosome movements and histone tail requirements. CHRAC is molecularly defined as ISWI, Acf1, CHRAC-14, and CHRAC-16.\",\n      \"method\": \"Biochemical purification, reconstitution, in vitro nucleosome sliding assay, mass spectrometry identification\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with quantitative nucleosome sliding assays, multiple orthogonal methods including MS identification\",\n      \"pmids\": [\"11447119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ACF1-SNF2H (ISWI) complex specifically localizes to replicating pericentromeric heterochromatin; RNAi depletion of ACF1 specifically impairs replication of pericentromeric heterochromatin and delays cell-cycle progression through late S phase. An ACF1 mutant unable to interact with SNF2H also interferes with condensed chromatin replication.\",\n      \"method\": \"RNAi depletion, BrdU incorporation/immunofluorescence localization, flow cytometry cell-cycle analysis, domain mutant expression\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi loss-of-function with specific heterochromatin replication phenotype, localization studies, mutant validation, multiple orthogonal readouts\",\n      \"pmids\": [\"12434153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Acf1 (Drosophila BAZ1A ortholog) binds DNA through a WAC motif in its N-terminus; interacts with ISWI through a DDT domain; an acidic region likely contacts histones during deposition. All three regions are required for full chromatin assembly activity of ACF.\",\n      \"method\": \"Systematic deletion/point mutagenesis of Acf1 domains, DNA-binding assays, in vitro chromatin assembly assay, ATPase assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic mutagenesis with in vitro biochemical assays, multiple domain mutants tested\",\n      \"pmids\": [\"12192034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human ACF1 (hACF1/BAZ1A) is a subunit of human CHRAC (HuCHRAC), which also contains SNF2H (ISWI isoform) and two histone-fold proteins (human orthologs of CHRAC-14/16). The two small histone-fold proteins form a stable sub-complex that binds naked DNA but not nucleosomes.\",\n      \"method\": \"Biochemical purification of HuCHRAC, co-purification/co-immunoprecipitation, DNA binding assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical purification with co-purification evidence, single lab, functional sub-complex characterization\",\n      \"pmids\": [\"10880450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Deletion of the C-terminal PHD finger modules of ACF1 (Drosophila BAZ1A ortholog), or their disruption by zinc chelation, profoundly reduces nucleosome mobilization by associated ISWI. PHD fingers of ACF1 interact with core histone central domains, contributing to ACF nucleosome substrate binding.\",\n      \"method\": \"Domain deletion mutagenesis, in vitro nucleosome mobilization assay, zinc chelation, nucleosome binding assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with in vitro reconstitution and quantitative nucleosome mobilization assays, multiple orthogonal approaches\",\n      \"pmids\": [\"15457208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Loss of Acf1 (Drosophila BAZ1A ortholog) in vivo decreases periodicity and repeat length of nucleosome arrays in bulk chromatin, compromises transcriptional silencing in pericentric heterochromatin and Polycomb-dependent repression, and accelerates S-phase progression. ACF/CHRAC promotes formation (not disruption) of repressive chromatin in vivo. Genetic interaction with nap1 (NAP-1 histone chaperone) confirmed.\",\n      \"method\": \"Drosophila Acf1 null genetics, micrococcal nuclease nucleosome ladder analysis, position effect variegation assay, flow cytometry, genetic epistasis with nap1\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo null genetics with multiple orthogonal phenotypic readouts and genetic epistasis, replicated across developmental stages\",\n      \"pmids\": [\"14752009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human ACF1 (hACF1/BAZ1A) alters the remodeling strategy of SNF2h: it changes the DNA overhang requirement for nucleosome remodeling and alters the DNA accessibility profile of remodeled products, likely contributing to nucleosome spacing efficiency.\",\n      \"method\": \"Reconstitution of hACF complex, in vitro nucleosome remodeling assay with defined DNA overhang substrates, restriction enzyme accessibility assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted complex with systematic substrate variation and quantitative in vitro assays, single lab\",\n      \"pmids\": [\"16877760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human Acf1 (BAZ1A) interacts with nuclear receptor corepressor N-CoR (identified by yeast two-hybrid); hAcf1 is required for stabilizing the VDR-N-CoR repression complex at target gene promoters (IGFBP3, RANKL). Hormone (vitamin D3) treatment releases hAcf1 from target promoters, and hAcf1 depletion alters histone modification profiles (H3/H4) and histone occupancy at these genes.\",\n      \"method\": \"Yeast two-hybrid, ChIP, RNAi knockdown, histone modification analysis\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus ChIP and RNAi with multiple chromatin readouts, single lab\",\n      \"pmids\": [\"17519354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ACF1 (Drosophila BAZ1A ortholog) and ISWI are required for basal repression of Wingless/Wnt target genes in Drosophila; ISWI localizes to Wg target gene chromatin at TCF binding sites while ACF1 distributes more broadly in a manner dependent on ISWI; they are required for TCF binding to chromatin and repress targets by antagonizing histone H4 acetylation. Wingless signaling reduces ACF1 binding to Wg target loci.\",\n      \"method\": \"Drosophila genetics (RNAi), ChIP, reporter assays, histone acetylation analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus genetic RNAi with multiple readouts, single lab, Drosophila model\",\n      \"pmids\": [\"18786525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ACF1 (BAZ1A) and SNF2H rapidly accumulate at DNA double-strand breaks (DSBs) and are required for DSB repair in human cells. ACF1 directly interacts with KU70 and is required for KU70/80 accumulation at DSBs. The CHRAC complex (ACF1, SNF2H, CHRAC15, CHRAC17) becomes more associated with chromatin after DSB-inducing treatments. Depletion of either ACF1 or SNF2H significantly reduces both NHEJ and HR frequencies.\",\n      \"method\": \"Co-immunoprecipitation, laser microirradiation with live-cell imaging, RNAi knockdown, NHEJ/HR reporter assays, clonogenic survival\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying direct KU70 interaction, RNAi with quantitative NHEJ/HR reporter assays, live-cell localization, multiple orthogonal approaches\",\n      \"pmids\": [\"21172662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"hACF1 (BAZ1A) and SNF2H accumulate at laser-induced DNA damage sites; depletion of hACF1 compromises the G2/M checkpoint activated by UV and X-rays, reduces γH2AX and CHK2 phosphorylation signals, increases apoptosis, and causes cells to enter mitosis despite unresolved replication stress lesions (aphidicolin model), resulting in metaphase chromosome breaks.\",\n      \"method\": \"RNAi depletion, laser microirradiation/immunofluorescence, flow cytometry (cell cycle), γH2AX/CHK2ph immunofluorescence, clonogenic survival\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi loss-of-function with multiple checkpoint readouts, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21745822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The PHD domain of BAZ1A (but not BAZ1B) has the non-canonical function of binding DNA. The BAZ1A bromodomain has a non-canonical gatekeeper residue and binds acetylated histone peptides relatively weakly. Both BAZ1A and BAZ1B recruit SMARCA5 to sites of DNA damage; structure-designed bromodomain and PHD mutants impair DNA damage recovery by disrupting ISWI factor loading at lesions.\",\n      \"method\": \"CRISPR-Cas9 genome editing, crystal structure determination, in vitro binding assays (DNA and acetyl-histone peptide), cell survival assays, structure-based mutagenesis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure determination combined with CRISPR-engineered mutants, in vitro binding assays, and cellular functional readouts\",\n      \"pmids\": [\"29021563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ACF1 expression is under strict developmental control in Drosophila, persisting at high levels in undifferentiated cells (germ cell precursors, larval neuroblasts); constitutive expression is lethal. Cell-specific ectopic ACF1 expression perturbs chromatin organization. ACF1-containing factors are involved in the initial establishment of heterochromatin structures during development.\",\n      \"method\": \"Immunostaining, transgenic expression, developmental staging, chromatin organization analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization/expression experiments with gain-of-function lethality phenotype, single lab\",\n      \"pmids\": [\"20843858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BAZ1A/ACF1 is recruited to UV-damaged chromatin in an MLL1-dependent manner: HBO1 interacts with DDB2 at UV lesions, maintains phosphorylated MLL1 at those sites, and MLL1 catalyzes H3K4 methylation that recruits BAZ1A. Depletion of MLL1 suppresses BAZ1A accumulation at UV-irradiated sites and inhibits CPD removal, placing BAZ1A downstream of the DDB2-HBO1-MLL1 axis in global genome NER.\",\n      \"method\": \"ChIP, immunofluorescence at UV-irradiated sites, RNAi depletion, CPD removal assay\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and localization assays with RNAi epistasis establishing pathway order, single lab\",\n      \"pmids\": [\"35940372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ACF1 (BAZ1A) and SMARCA5 each accumulate at DNA breaks independently of each other in an ADP-ribosylation-dependent manner; their recruitment is not due to direct binding to ADP-ribose moieties but is facilitated by DNA binding at relaxed (ADP-ribosylated) chromatin.\",\n      \"method\": \"Live-cell imaging, laser microirradiation, ADP-ribosylation inhibitors, FRAP, domain mutant analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell imaging with pharmacological and genetic dissection, single lab, multiple approaches\",\n      \"pmids\": [\"38170578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BAZ1A knockdown induces cellular senescence phenotypes; mechanistically, BAZ1A depletion upregulates SMAD3, which in turn activates transcription of the p21-encoding gene CDKN1A, causing senescence-associated phenotypes in human cancer cells.\",\n      \"method\": \"shRNA knockdown, SA-β-Gal staining, EdU incorporation, CCK-8 assay, gene expression analysis\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, indirect pathway placement via gene expression changes without direct chromatin mechanistic experiments\",\n      \"pmids\": [\"31085244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP10 physically interacts with BAZ1A, deubiquitinates it, and stabilizes BAZ1A protein levels. BAZ1A complexes with SOX2 to drive enhancer-promoter interactions and recruit BRD4, thereby activating cancer stem cell-related gene expression programs in head and neck squamous cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, chromatin immunoprecipitation (ChIP), gene expression analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying deubiquitination and complex formation, ChIP for enhancer-promoter interactions, single lab\",\n      \"pmids\": [\"40204721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BAZ1A interacts with E2F1; BAZ1A, E2F1, and SMARCA1/5 form a complex that binds the E2F1 promoter. BAZ1A depletion reduces DNaseI sensitivity at E2F1 binding regions of the E2F1 promoter and reduces E2F1-dependent transcription, leading to G1-phase arrest. ChIP-ReChIP confirmed co-occupancy of BAZ1A-bound chromatin by E2F1 at specific E2F1 promoter sites.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, ChIP-ReChIP, DNaseI sensitivity assay, RNAi knockdown, RNA-seq, orthotopic xenograft\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP-ReChIP co-occupancy and DNaseI accessibility, multiple methods, single lab, preprint not peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.11.20.624462\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BAZ1A localizes to heterochromatin during spermatogenesis and interacts with DICER and major satellite repeat (MSR) chromatin in mouse testes, suggesting a role in heterochromatin regulation in the male germline.\",\n      \"method\": \"Immunofluorescence, co-immunoprecipitation, ChIP in mouse testis\",\n      \"journal\": \"Reproduction\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, Co-IP and localization without functional mechanistic follow-up\",\n      \"pmids\": [\"36194437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NAA20 interacts with ACF1 (BAZ1A), promotes its lactylation (enhanced by lactate), and this modification drives nuclear translocation of ACF1. Lactylated ACF1 increases H3K27ac and H3K4me3 at the GCLM promoter, recruiting Myc and activating GCLM-dependent glutathione synthesis in neuroblastoma.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), luciferase assay, immunofluorescence, RNAi knockdown, xenograft models\",\n      \"journal\": \"Cell biology and toxicology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, new post-translational modification (lactylation) identified by Co-IP and ChIP, no in vitro reconstitution of modification\",\n      \"pmids\": [\"41644856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In yeast, the WAC-downWAC module (N-terminal region of Itc1, the BAZ1A ortholog) forms a conserved structural module predicted to interact with DNA; deletion of this module abolishes ISW2 complex function at target genes (nucleosome positioning at +1 positions) without affecting global nucleosome organization, functionally equivalent to a null allele.\",\n      \"method\": \"Yeast genetics, genome-wide nucleosome mapping (MNase-seq), structural prediction, growth assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide nucleosome mapping with defined deletion mutant, multiple genetic backgrounds tested, preprint\",\n      \"pmids\": [\"bio_10.1101_2025.04.27.650761\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"BAZ1A (ACF1/hACF1) is the large non-catalytic subunit of the ISWI-family chromatin remodeling complexes ACF and CHRAC, where it associates with the SNF2H/SMARCA5 ATPase and synergistically enhances nucleosome sliding and spacing ~10-fold through PHD finger contacts with core histones, a WAC/DDT-mediated DNA-binding module, and allosteric modulation of the ATPase remodeling strategy; in the DNA damage response, BAZ1A accumulates at DSBs and UV lesions (the latter via a DDB2-HBO1-MLL1-H3K4me axis), directly interacts with KU70 to promote both NHEJ and HR, supports the G2/M checkpoint, and is recruited to relaxed ADP-ribosylated chromatin independently of its ATPase partner; additionally, BAZ1A represses nuclear receptor-regulated gene expression by stabilizing the VDR-NCoR complex at target promoters, represses Wnt target genes by antagonizing H4 acetylation and supporting TCF chromatin binding, and promotes E2F1-dependent transcription through a BAZ1A-E2F1-SMARCA1/5 complex.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BAZ1A (ACF1/hACF1) is the large non-catalytic subunit of ISWI-family chromatin remodeling complexes ACF and CHRAC, where it associates with the SNF2H/SMARCA5 (ISWI) ATPase and synergistically enhances ATP-dependent nucleosome assembly, sliding, and spacing roughly 10-fold relative to the ATPase alone [#0, #1]. It contributes to remodeling through distinct modules: a WAC/DDT region that binds DNA and mediates the ISWI interaction, an acidic histone-contacting region, and C-terminal PHD fingers that engage core histone domains to anchor the nucleosome substrate [#3, #5], and it qualitatively reprograms the SNF2H remodeling strategy by changing DNA-overhang requirements and the accessibility profile of remodeled products [#7]; its PHD finger has a non-canonical DNA-binding activity while its bromodomain binds acetylated histones weakly [#12]. Through this activity BAZ1A organizes repressive and heterochromatic chromatin: it localizes to and is required for replication of pericentromeric heterochromatin, maintains nucleosome array periodicity, and supports transcriptional silencing [#2, #6]. In the DNA damage response, BAZ1A and SNF2H rapidly accumulate at double-strand breaks and UV lesions, where BAZ1A directly interacts with KU70 to promote KU70/80 loading and both NHEJ and HR, supports the G2/M checkpoint, and is recruited to relaxed ADP-ribosylated chromatin via DNA binding independently of its ATPase partner [#10, #11, #15]; its recruitment to UV lesions proceeds through a DDB2-HBO1-MLL1-H3K4me axis that delivers BAZ1A for CPD removal in global genome NER [#14]. BAZ1A also acts in gene-specific transcriptional regulation, stabilizing the VDR-N-CoR corepressor complex at nuclear-receptor target promoters [#8] and forming a BAZ1A-E2F1-SMARCA1/5 complex that opens E2F1 promoter chromatin to drive E2F1-dependent transcription and G1/S progression [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that the ISWI ATPase requires a partner subunit for full activity, identifying Acf1 as the defining accessory subunit that converts the bare motor into a functional chromatin assembly machine.\",\n      \"evidence\": \"Biochemical purification and reconstitution of recombinant two-subunit ACF with in vitro chromatin assembly assays in Drosophila\",\n      \"pmids\": [\"10385622\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map which Acf1 domains confer the added activity\", \"Human ortholog not yet characterized\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed Acf1 not only boosts but qualitatively reprograms the ISWI motor, defining CHRAC as a discrete four-subunit complex and explaining the ~10-fold enhancement of nucleosome sliding.\",\n      \"evidence\": \"Reconstitution and in vitro nucleosome sliding assays with mass spectrometry identification of CHRAC subunits\",\n      \"pmids\": [\"11447119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Acf1 alters directionality not structurally resolved\", \"Role of CHRAC-14/16 histone-fold proteins in the activity change unclear\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined the human complex HuCHRAC, demonstrating that the ACF/CHRAC architecture including hACF1/BAZ1A and SNF2H is conserved in humans.\",\n      \"evidence\": \"Biochemical purification of HuCHRAC with co-IP and DNA-binding assays\",\n      \"pmids\": [\"10880450\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab purification\", \"Functional remodeling activity of human complex not yet quantified here\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Dissected the modular architecture of Acf1, assigning DNA binding to the WAC motif, ISWI interaction to the DDT domain, and histone contact to an acidic region, showing all are needed for assembly.\",\n      \"evidence\": \"Systematic deletion/point mutagenesis with DNA-binding, chromatin assembly, and ATPase assays\",\n      \"pmids\": [\"12192034\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PHD finger role not addressed in this study\", \"Structural basis of DDT-ISWI interface not resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Linked ACF1 remodeling activity to a specific in vivo process by showing it is required for replication of condensed pericentromeric heterochromatin and timely late-S progression.\",\n      \"evidence\": \"RNAi depletion with BrdU localization, flow cytometry, and SNF2H-interaction mutant in human cells\",\n      \"pmids\": [\"12434153\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How remodeling facilitates fork progression through heterochromatin not defined\", \"No direct replication-factor interaction mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified the PHD fingers as a substrate-recognition module that contacts core histones and is required for efficient nucleosome mobilization.\",\n      \"evidence\": \"Domain deletion, zinc chelation, and in vitro nucleosome mobilization/binding assays\",\n      \"pmids\": [\"15457208\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Histone surface contacted not pinpointed at residue level\", \"Did not test DNA-binding function of PHD\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated in vivo that ACF/CHRAC promotes formation of repressive chromatin, regularizing nucleosome spacing and supporting heterochromatic and Polycomb silencing.\",\n      \"evidence\": \"Drosophila Acf1 null genetics, MNase nucleosome ladders, position-effect variegation, and nap1 epistasis\",\n      \"pmids\": [\"14752009\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct targets of silencing not mapped genome-wide\", \"Relationship to mammalian heterochromatin not established here\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed human ACF1 changes the remodeling strategy of SNF2h, altering DNA-overhang requirements and product accessibility, providing the biochemical basis for spacing efficiency.\",\n      \"evidence\": \"Reconstituted hACF with defined-overhang nucleosome substrates and restriction-accessibility assays\",\n      \"pmids\": [\"16877760\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-lab study\", \"Structural mechanism of strategy switch unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended BAZ1A function beyond remodeling to gene-specific repression by showing it stabilizes the VDR-N-CoR corepressor complex at hormone-responsive promoters.\",\n      \"evidence\": \"Yeast two-hybrid, ChIP, RNAi, and histone-modification analysis at IGFBP3/RANKL\",\n      \"pmids\": [\"17519354\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs SNF2H-dependent recruitment not separated\", \"Generality across nuclear receptors untested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Connected ACF1/ISWI to developmental signaling by showing they repress Wnt targets via TCF chromatin binding and antagonism of H4 acetylation.\",\n      \"evidence\": \"Drosophila RNAi, ChIP, reporter and histone-acetylation assays\",\n      \"pmids\": [\"18786525\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mammalian conservation of Wnt regulation untested\", \"Mechanism linking remodeling to H4 acetylation unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed BAZ1A directly in DSB repair by identifying a direct KU70 interaction that drives KU70/80 loading and promotes both NHEJ and HR.\",\n      \"evidence\": \"Reciprocal co-IP, laser microirradiation live imaging, RNAi with NHEJ/HR reporters and clonogenic survival\",\n      \"pmids\": [\"21172662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single factor supports both NHEJ and HR not mechanistically resolved\", \"Remodeling vs scaffolding contribution at breaks not separated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed BAZ1A is required for the G2/M checkpoint and genome stability under replication stress, linking its damage role to cell-cycle control.\",\n      \"evidence\": \"RNAi depletion with checkpoint, gammaH2AX/CHK2 phosphorylation, apoptosis, and chromosome-break readouts\",\n      \"pmids\": [\"21745822\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct checkpoint-kinase connection not defined\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided structural basis for BAZ1A's non-canonical reader modules, showing its PHD binds DNA and its bromodomain binds acetyl-histones weakly, both required for ISWI loading at lesions.\",\n      \"evidence\": \"Crystal structures, CRISPR-engineered mutants, in vitro binding, and cell survival assays\",\n      \"pmids\": [\"29021563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous chromatin marks read at lesions not defined\", \"Relative contributions of PHD-DNA vs bromodomain not quantified in vivo\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined the recruitment pathway for BAZ1A at UV lesions, placing it downstream of a DDB2-HBO1-MLL1-H3K4me axis required for CPD removal in global genome NER.\",\n      \"evidence\": \"ChIP, immunofluorescence at UV sites, RNAi epistasis, and CPD removal assay\",\n      \"pmids\": [\"35940372\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct H3K4me-BAZ1A reading not shown biochemically\", \"Step at which BAZ1A acts in NER unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed BAZ1A and SMARCA5 are recruited to breaks independently of each other via DNA binding at relaxed ADP-ribosylated chromatin, decoupling BAZ1A recruitment from its ATPase partner.\",\n      \"evidence\": \"Live-cell imaging, laser microirradiation, ADP-ribosylation inhibitors, FRAP, and domain mutants\",\n      \"pmids\": [\"38170578\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether independent recruitment produces functional complexes at breaks unclear\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a transcription-activating role for BAZ1A in a BAZ1A-E2F1-SMARCA1/5 complex that opens E2F1 promoter chromatin to drive E2F1-dependent transcription and cell-cycle progression.\",\n      \"evidence\": \"Co-IP, ChIP-ReChIP co-occupancy, DNaseI sensitivity, RNAi, RNA-seq, and orthotopic xenograft (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.11.20.624462\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"How a repressive remodeler activates here mechanistically unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified USP10 as a deubiquitinase that stabilizes BAZ1A, which complexes with SOX2 to drive enhancer-promoter looping and BRD4 recruitment in cancer stem cells.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, and ChIP in head and neck squamous cell carcinoma\",\n      \"pmids\": [\"40204721\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect SOX2/BRD4 association not fully separated\", \"Single-lab, disease-specific context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How BAZ1A switches between its core repressive/heterochromatin-organizing remodeling role and its context-specific transcription-activating and germline/metabolic functions, and what selects between its many partners, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model integrating remodeling, DDR, and gene-specific roles\", \"Post-translational control (lactylation, deubiquitination) of partner choice uncharacterized\", \"Mammalian heterochromatin/germline functions lack mechanistic depth\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [3, 12]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [8, 18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [2, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1, 5, 6]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [10, 12, 14]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 18]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11, 18]}\n    ],\n    \"complexes\": [\"ACF\", \"CHRAC\"],\n    \"partners\": [\"SMARCA5\", \"KU70\", \"NCOR1\", \"E2F1\", \"SMARCA1\", \"USP10\", \"SOX2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}