{"gene":"BAZ1B","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2008,"finding":"WSTF (BAZ1B) possesses intrinsic tyrosine kinase activity through a domain with no sequence homology to any known kinase fold, and directly phosphorylates H2A.X on Tyr142, regulating the DNA damage response.","method":"In vitro kinase assay, active-site characterization, mutagenesis, mass spectrometry identification of phosphorylation site","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay with substrate identification, domain mutagenesis, and MS validation; widely cited foundational study","pmids":["19092802"],"is_preprint":false},{"year":2002,"finding":"WSTF forms a two-subunit chromatin remodeling complex (WICH) with the ISWI ATPase (SNF2H in mouse, ISWI in Xenopus), purified to homogeneity; the complex catalyzes assembly of regularly spaced nucleosomal arrays in vitro and localizes to pericentric heterochromatin coincident with its replication.","method":"Biochemical purification from Xenopus egg extract, Co-IP with SNF2H in mouse cells, in vitro nucleosome assembly assay, immunofluorescence","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — complex purified to homogeneity, in vitro activity demonstrated, localization confirmed by IF; replicated across species","pmids":["11980720"],"is_preprint":false},{"year":2005,"finding":"The WSTF bromodomain binds acetylated histones and is required for WINAC complex association with chromatin and ligand-induced VDR-mediated transrepression of the 1α-hydroxylase (CYP19A1) gene; a bromodomain deletion mutant acts as a dominant-negative.","method":"In vitro chromatin template assays, domain-deletion mutagenesis, dominant-negative rescue experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro chromatin assay with mutagenesis establishing bromodomain-acetyl histone interaction and functional consequence; single lab but multiple orthogonal methods","pmids":["16252006"],"is_preprint":false},{"year":2006,"finding":"The WICH complex (WSTF-SNF2h) interacts with nuclear myosin 1 (NM1) and associates with RNA polymerase I and rDNA; RNAi knockdown of WSTF reduces pre-rRNA synthesis in vivo, and antibodies to WSTF inhibit Pol I transcription on chromatin but not naked DNA.","method":"Biochemical fractionation, co-immunoprecipitation, ChIP, RNAi knockdown, in vitro transcription on chromatin templates","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, ChIP, RNAi with functional readout, and in vitro chromatin transcription assay; single lab with multiple orthogonal methods","pmids":["16514417"],"is_preprint":false},{"year":2006,"finding":"WSTF-SNF2h (WICH) is part of a larger ~3 MDa assembly called B-WICH that also contains NM1, Sf3b155, RNA helicase II/Gualpha, Myb-binding protein 1a, CSB, and the proto-oncogene Dek; WSTF-SNF2h-NM1 is associated with RNA Pol III genes (5S rRNA, 7SL), and post-transcriptional silencing of WSTF reduces these Pol III transcripts.","method":"Biochemical fractionation, co-immunoprecipitation, ChIP, RNAi knockdown with transcript-level quantification","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, ChIP, and RNAi with functional readout; single lab","pmids":["16603771"],"is_preprint":false},{"year":2009,"finding":"WSTF is an indispensable shared subunit of both WINAC (SWI/SNF-type) and WICH (ISWI-type) complexes in vivo: WSTF knockout mice show neonatal lethality with cardiovascular defects linked to impaired WINAC-dependent transcription at the Gja5 promoter, and impaired WICH-dependent SNF2H recruitment to PCNA and reduced cell survival after DNA damage—each defect rescued by overexpression of the respective complex components.","method":"WSTF knockout mouse generation, genetic rescue by complex-component overexpression (epistasis), MEF cell assays, ChIP, co-IP with PCNA","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with defined molecular phenotype, genetic rescue establishing pathway position for two distinct complexes, multiple orthogonal methods","pmids":["19470456"],"is_preprint":false},{"year":2005,"finding":"WSTF (within WICH) binds PCNA and localizes to replication foci; depletion of WSTF results in decreased chromatin accessibility on newly replicated DNA and global heterochromatin formation, implicating WICH in epigenetic inheritance through post-replication nucleosome remodeling.","method":"Co-IP with PCNA, immunofluorescence at replication foci, WSTF depletion with chromatin accessibility assay","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PCNA interaction, localization, and depletion phenotype; review/perspective with original data elements, single lab","pmids":["15753658"],"is_preprint":false},{"year":2012,"finding":"WSTF (WICH complex) transiently associates with the inactive X chromosome during late S-phase coincident with Xi DNA replication, and this elevated association precedes BRCA1 and γ-H2A.X recruitment, suggesting a distinct role in heterochromatin maturation post-replication.","method":"Immunofluorescence, cell-cycle staging, sequential localization analysis on Xi","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by IF with temporal resolution and functional inference; single lab, localization without full functional dissection","pmids":["23166813"],"is_preprint":false},{"year":2019,"finding":"WSTF-generated constitutive H2AX-pTyr142 associates with RNA polymerase II and active transcription; ATM-dependent EYA1/3 phosphatases remove this mark to silence transcription at DNA damage sites; subsequent re-phosphorylation by WSTF translocating to lesions facilitates transcription-coupled homologous recombination (TC-HR) in G1, using RNAPII-dependent RNA as donor templates.","method":"Co-IP of pTyr142-H2AX with RNAPII, ATM inhibition, EYA1/3 knockdown, WSTF knockdown, RAD51/RPA32 ChIP, HR reporter assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple co-IP, ChIP, and knockdown experiments with mechanistic pathway placement; single lab","pmids":["31045206"],"is_preprint":false},{"year":2020,"finding":"WSTF is acetylated at Lys426 by MOF acetyltransferase and deacetylated by SIRT1; MSL1v1 bridges WSTF and MOF for this acetylation. K426 acetylation promotes WSTF Ser158 phosphorylation and enhances both kinase and transcriptional regulatory activities of WSTF.","method":"Mass spectrometry identification of acetylation site, in vitro and in vivo acetylation assays with MOF/SIRT1, co-IP, mutagenesis (K426R), functional proliferation/invasion assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PTM site identified by MS, writer/eraser identified by co-IP and in vitro assay, mutagenesis confirms functional consequence; single lab","pmids":["32518374"],"is_preprint":false},{"year":2016,"finding":"WSTF overexpression activates PI3K/Akt and IL-6/STAT3 oncogenic signaling pathways to promote EMT (upregulation of fibronectin, N-cadherin, Snail, Slug, Twist; downregulation of E-cadherin) and increases lung cancer cell proliferation and invasion; these effects are reversed by PI3K or STAT3 inhibitors.","method":"cDNA overexpression, shRNA knockdown, cDNA microarray, qRT-PCR, western blot for EMT markers, pharmacological inhibition, xenograft models","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — OE and KD with pathway inhibitor rescue, in vivo xenograft; single lab, pathway placement through pharmacological epistasis","pmids":["27449264"],"is_preprint":false},{"year":2016,"finding":"BAZ1B haploinsufficiency causes transcriptional dysregulation enriched for neurogenesis and neuron differentiation genes (identified by ChIP-seq); BAZ1B loss activates Wnt signaling and impairs neurogenic commitment in neural progenitor cells, and this differentiation defect is rescued by inhibiting over-active Wnt signaling.","method":"ChIP-seq of BAZ1B targets in iPSC-derived neurons, RNA-seq of WS patient-derived neurons, BAZ1B haploinsufficiency models, Wnt inhibitor rescue","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq target mapping, transcriptomics, patient-derived cells, genetic rescue by Wnt inhibition; multiple orthogonal methods establishing pathway position","pmids":["26755828"],"is_preprint":false},{"year":2018,"finding":"BAZ1B localizes to the mitotic chromosome axis (scaffold) and knockout of BAZ1B in chicken DT40 cells causes prophase delay due to altered chromosome condensation timing and mitosis progression errors; simultaneous knockout of BAZ1A aggravates this phenotype.","method":"Quantitative proteomics of mitotic chromosome scaffold, CRISPR/Cas9 knockout, live-cell imaging, microscopy of condensation timing","journal":"Molecular & cellular proteomics : MCP","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics localization plus KO with defined mitotic phenotype; single lab, chicken model","pmids":["30266865"],"is_preprint":false},{"year":2024,"finding":"BAZ1B (as part of the WICH complex) interacts with ATAD5, and the BAZ1B-binding region on ATAD5 overlaps the UAF1-binding domain; BAZ1B binding to ATAD5 prevents premature de-ubiquitination of mono-ubiquitinated PCNA after oxidative DNA damage, and disruption of this interaction increases cellular sensitivity to oxidative stress.","method":"Co-IP of BAZ1B with ATAD5, domain mapping, WSTF binding-deficient ATAD5 mutants, Ub-PCNA de-ubiquitination kinetics assay, oxidative stress survival assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, domain mapping, functional mutant with defined molecular and cellular phenotype; single lab but multiple orthogonal methods","pmids":["39627214"],"is_preprint":false},{"year":2019,"finding":"BAZ1B is a key regulator of neural crest stem cell (NCSC) induction and migration in vitro, and controls NC-specific transcriptional circuits and distal regulatory elements, as established by functional dissection in patient-derived iPSC-NCSCs from WS and atypical 7q11.23 CNV patients.","method":"iPSC differentiation to NCSC, migration assays, ChIP/ATAC-seq, transcriptome analysis in BAZ1B haploinsufficiency and overexpression patient-derived cells","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived cell models with functional migration and transcriptional assays; single study, multiple omics methods","pmids":["31840056"],"is_preprint":false},{"year":2025,"finding":"During chronic (but not acute) inflammation, WSTF interacts with the ATG8 autophagy protein family in the nucleus, leading to WSTF nuclear export and degradation by autophagosomes/lysosomes; loss of WSTF opens chromatin over inflammatory genes and amplifies NF-κB-driven inflammation; cell-penetrating peptides blocking WSTF-ATG8 interaction suppress chronic inflammation in MASH and osteoarthritis mouse models.","method":"Co-IP of WSTF with ATG8 family members, nuclear fractionation, autophagy flux assays, WSTF knockout/knockdown, ATAC-seq, NF-κB reporter, in vivo mouse models (MASH, osteoarthritis), cell-penetrating peptide inhibitor","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP, nuclear fractionation, multiple KO/KD models, chromatin accessibility, in vivo mouse models, peptide inhibitor rescue; multiple orthogonal methods in a single rigorous study","pmids":["40604282"],"is_preprint":false},{"year":2015,"finding":"BAZ1B (WSTF) is dispensable for H2AX Tyr142 phosphorylation on sex chromosomes during meiosis and for male fertility; conditional BAZ1B deletion in spermatocytes causes ectopic γH2AX on synapsed autosomes at early pachytene but does not affect sex chromosome silencing or SNF2H localization during meiosis—demonstrating context-dependent roles distinct from somatic cells.","method":"Conditional BAZ1B knockout in mouse spermatocytes, immunofluorescence for pTyr142/γH2AX, fertility assays, SMARCA5 localization","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined meiotic phenotypes; negative results for some functions are mechanistically informative; single lab","pmids":["25979708"],"is_preprint":false},{"year":2012,"finding":"WSTF acts as a comodulator bound to the CYP19A1 (aromatase) promoter and is required for its transcriptional activity; treatment with vitamin D analog EB1089 causes WSTF dissociation from the promoter (detected by ChIP/Re-ChIP), and WSTF gene silencing reduces CYP19A1 expression and aromatase activity.","method":"ChIP, Re-ChIP, siRNA-mediated WSTF silencing, qRT-PCR, aromatase activity assay","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP/Re-ChIP establishes promoter occupancy, siRNA with functional readout; single lab, two orthogonal methods","pmids":["23085504"],"is_preprint":false},{"year":2026,"finding":"WSTF localizes to promoters and gene bodies of actively transcribed loci together with co-activators ASH2L and CBP; WSTF loss depletes ASH2L/CBP at these loci, causes loss of H3K4me2 and multiple acetylation marks, gain of Polycomb components, widespread isoform switching, and activates Wnt/β-catenin signaling—with TCF7L2 showing locus-specific isoform switching due to gene-body loss of active marks.","method":"CUT&RUN chromatin profiling, transcriptome profiling, histone PTM analysis, microscopy in WSTF knockout HCT116 cells; locus-specific ChIP validation at TCF7L2","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CUT&RUN, transcriptomics, and histone modification profiling in engineered KO cells; single lab, multiple orthogonal omics methods","pmids":["42258541"],"is_preprint":false},{"year":2026,"finding":"BAZ1B mediates ubiquitination-dependent degradation of P21 (CDKN1A); BAZ1B knockdown suppresses this degradation, leading to P21 accumulation, cellular senescence, and trophoblast dysfunction in a 6PPD-exposure model; supplementation with Baz1b or P21 downregulation rescues placental senescence in vivo.","method":"BAZ1B knockdown/overexpression in trophoblast cells, ubiquitination assays, western blot for P21, mouse 6PPD exposure model with Baz1b rescue","journal":"EBioMedicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ubiquitination assay and KD/OE with single mechanistic claim; single lab, limited orthogonal validation of direct BAZ1B-P21 ubiquitination","pmids":["42224779"],"is_preprint":false}],"current_model":"BAZ1B (WSTF) is a multifunctional chromatin remodeler that operates as the regulatory subunit of two distinct ATP-dependent complexes—WICH (with ISWI/SNF2H, involved in replication-coupled chromatin assembly, PCNA interaction, DNA damage response, and Pol I/III transcription) and WINAC (SWI/SNF-type, involved in nuclear receptor-mediated transcription)—and additionally possesses intrinsic tyrosine kinase activity that phosphorylates H2A.X Tyr142 to regulate the DNA damage response and transcription-coupled homologous recombination; its bromodomain binds acetylated histones to recruit complexes to chromatin, it is itself regulated by MOF-mediated K426 acetylation and SIRT1 deacetylation, it interacts with ATAD5 to prevent premature PCNA de-ubiquitination, and during chronic inflammation its nuclear interaction with ATG8 family proteins triggers its autophagosomal degradation, thereby controlling chromatin accessibility over inflammatory genes."},"narrative":{"mechanistic_narrative":"BAZ1B (WSTF) is a multifunctional chromatin regulator that serves as the indispensable, shared regulatory subunit of two distinct ATP-dependent remodeling complexes—the ISWI-type WICH (with SNF2H) and the SWI/SNF-type WINAC—coupling chromatin remodeling to replication, transcription, and the DNA damage response [PMID:19470456, PMID:16252006, PMID:11980720]. Within WICH, BAZ1B binds PCNA and localizes to replication foci, where it maintains chromatin accessibility on newly replicated DNA and contributes to post-replication heterochromatin maturation, including transient association with the inactive X chromosome [PMID:15753658, PMID:23166813]; it also assembles into the larger B-WICH complex with nuclear myosin 1 and other factors to promote RNA Pol I and Pol III transcription of rDNA and 5S/7SL genes [PMID:16514417, PMID:16603771]. BAZ1B carries an atypical intrinsic tyrosine kinase activity—housed in a domain unrelated to canonical kinase folds—that phosphorylates H2A.X on Tyr142 to regulate the DNA damage response, and this mark, dynamically removed by EYA phosphatases and re-deposited by BAZ1B, governs transcription-coupled homologous recombination [PMID:19092802, PMID:31045206]. Its bromodomain reads acetylated histones to dock WINAC on chromatin and direct nuclear-receptor-mediated transcription, including VDR-dependent regulation of CYP19A1 [PMID:16252006, PMID:23085504]. BAZ1B occupies active loci alongside ASH2L and CBP to maintain H3K4me2 and histone acetylation and restrain Polycomb and Wnt/β-catenin signaling, and its haploinsufficiency dysregulates neurogenic and neural-crest transcriptional programs through aberrant Wnt activation [PMID:42258541, PMID:26755828, PMID:31840056]. BAZ1B also acts at the mitotic chromosome scaffold to time chromosome condensation [PMID:30266865], interacts with ATAD5 to prevent premature de-ubiquitination of PCNA after oxidative damage [PMID:39627214], and during chronic inflammation is exported and degraded via nuclear ATG8 interaction, opening chromatin over NF-κB-driven inflammatory genes [PMID:40604282]. BAZ1B activity is tuned by MOF-mediated K426 acetylation and SIRT1 deacetylation [PMID:32518374].","teleology":[{"year":2002,"claim":"Established BAZ1B as the targeting subunit of a defined ISWI-family remodeling complex, answering what biochemical machine WSTF operates within.","evidence":"Biochemical purification of WICH from Xenopus extract, Co-IP with SNF2H, in vitro nucleosome spacing assay, and IF at pericentric heterochromatin","pmids":["11980720"],"confidence":"High","gaps":["Did not define the in vivo essentiality of the complex","Did not connect remodeling to a specific physiological output"]},{"year":2005,"claim":"Connected WICH to DNA replication by showing BAZ1B binds PCNA and maintains open chromatin on nascent DNA, framing a role in epigenetic inheritance.","evidence":"Co-IP with PCNA, IF at replication foci, and WSTF depletion with chromatin accessibility readout","pmids":["15753658"],"confidence":"Medium","gaps":["Mechanism of accessibility maintenance not resolved at nucleotide resolution","Did not test downstream heritability of marks directly"]},{"year":2005,"claim":"Assigned a transcriptional function to the BAZ1B bromodomain as an acetyl-histone reader required to recruit WINAC for nuclear-receptor signaling.","evidence":"In vitro chromatin template assays, bromodomain-deletion mutagenesis, and dominant-negative rescue at the CYP19A1/VDR axis","pmids":["16252006"],"confidence":"High","gaps":["Acetyl-lysine specificity of the bromodomain not fully mapped","Composition of WINAC not exhaustively defined here"]},{"year":2006,"claim":"Extended BAZ1B function to RNA polymerase I and III transcription as part of the larger B-WICH assembly, broadening its role beyond replication.","evidence":"Biochemical fractionation, reciprocal Co-IP with NM1/Pol I and Pol III genes, ChIP, RNAi with transcript-level readouts, and in vitro chromatin transcription","pmids":["16514417","16603771"],"confidence":"High","gaps":["Whether remodeling versus scaffolding drives transcriptional support is unresolved","Direct catalytic contribution of WSTF kinase to Pol I/III not tested"]},{"year":2008,"claim":"Revealed an unprecedented intrinsic tyrosine kinase activity in BAZ1B targeting H2A.X Tyr142, defining a direct enzymatic role in the DNA damage response.","evidence":"In vitro kinase assays, active-site characterization, mutagenesis, and MS identification of the Tyr142 phosphosite","pmids":["19092802"],"confidence":"High","gaps":["Structural basis of the atypical kinase fold not solved","Full substrate repertoire beyond H2A.X not defined"]},{"year":2009,"claim":"Demonstrated in vivo that BAZ1B is the obligate shared subunit of both WINAC and WICH, separating its transcriptional and replication/repair functions genetically.","evidence":"WSTF knockout mouse with cardiovascular phenotype, complex-component overexpression rescue (epistasis), MEF assays, ChIP, and PCNA Co-IP","pmids":["19470456"],"confidence":"High","gaps":["Tissue-specific division of the two complexes not mapped","Relative contribution of kinase activity to the knockout phenotype not isolated"]},{"year":2012,"claim":"Placed BAZ1B temporally at the replicating inactive X and at the CYP19A1 promoter, refining its roles in heterochromatin maturation and nuclear-receptor-regulated transcription.","evidence":"IF with cell-cycle staging on Xi; ChIP/Re-ChIP and siRNA with aromatase activity readouts at CYP19A1","pmids":["23166813","23085504"],"confidence":"Medium","gaps":["Causal role of Xi association in silencing not established","How ligand triggers WSTF promoter dissociation is unknown"]},{"year":2016,"claim":"Linked BAZ1B dosage to developmental gene programs and oncogenic signaling, connecting chromatin function to neurogenesis and tumor phenotypes.","evidence":"ChIP-seq/RNA-seq in patient-derived neurons with Wnt-inhibitor rescue; overexpression/knockdown with PI3K/STAT3 inhibitor rescue and xenografts in lung cancer","pmids":["26755828","27449264"],"confidence":"High","gaps":["Direct versus indirect control of Wnt target genes not fully separated","Whether oncogenic signaling depends on remodeling or kinase activity unclear"]},{"year":2018,"claim":"Identified a mitotic role for BAZ1B at the chromosome scaffold controlling condensation timing, distinct from its interphase chromatin functions.","evidence":"Quantitative proteomics of mitotic chromosome scaffold and CRISPR knockout with live-cell imaging in DT40 cells, aggravated by BAZ1A co-deletion","pmids":["30266865"],"confidence":"Medium","gaps":["Molecular target on the axis not identified","Whether SNF2H is required for this role untested"]},{"year":2019,"claim":"Resolved how the H2AX-pTyr142 mark is dynamically regulated to switch between transcription and transcription-coupled homologous recombination at lesions.","evidence":"Co-IP of pTyr142-H2AX with RNAPII, ATM inhibition, EYA1/3 and WSTF knockdown, RAD51/RPA32 ChIP, and HR reporter assays; plus iPSC-NCSC functional dissection of neural-crest circuits","pmids":["31045206","31840056"],"confidence":"Medium","gaps":["Direct demonstration of RNA template use during TC-HR incomplete","Kinetics of WSTF translocation to lesions not fully defined"]},{"year":2015,"claim":"Showed context dependence of BAZ1B function by demonstrating it is dispensable for H2AX Tyr142 phosphorylation in meiotic sex chromosome silencing despite its somatic kinase role.","evidence":"Conditional BAZ1B knockout in mouse spermatocytes with IF for pTyr142/γH2AX, fertility assays, and SMARCA5 localization","pmids":["25979708"],"confidence":"Medium","gaps":["Identity of the compensating meiotic kinase unknown","Mechanism of the early-pachytene ectopic γH2AX phenotype unresolved"]},{"year":2020,"claim":"Defined an acetylation switch controlling BAZ1B activity, showing post-translational tuning of its kinase and transcriptional functions.","evidence":"MS site mapping of K426, in vitro/in vivo acetylation with MOF/SIRT1, MSL1v1-bridged Co-IP, K426R mutagenesis, and proliferation/invasion assays","pmids":["32518374"],"confidence":"Medium","gaps":["How K426 acetylation mechanistically promotes Ser158 phosphorylation unclear","In vivo physiological context of the switch not established"]},{"year":2024,"claim":"Identified the BAZ1B–ATAD5 interaction as a mechanism protecting mono-ubiquitinated PCNA from premature de-ubiquitination after oxidative damage.","evidence":"Reciprocal Co-IP, domain mapping (overlap with UAF1-binding region), binding-deficient ATAD5 mutants, Ub-PCNA de-ubiquitination kinetics, and oxidative stress survival assays","pmids":["39627214"],"confidence":"High","gaps":["Whether WICH remodeling is required for this protective role untested","Structural detail of the competition with UAF1 not resolved"]},{"year":2025,"claim":"Established a nuclear autophagy mechanism whereby ATG8-mediated degradation of BAZ1B opens inflammatory chromatin during chronic inflammation, with therapeutic implications.","evidence":"Co-IP with ATG8 family, nuclear fractionation, autophagy flux assays, KO/KD models, ATAC-seq, NF-κB reporter, MASH/osteoarthritis mouse models, and cell-penetrating peptide inhibitor rescue","pmids":["40604282"],"confidence":"High","gaps":["Trigger that converts acute to chronic ATG8 engagement not defined","Whether kinase or remodeling activity of retained WSTF restrains inflammation untested"]},{"year":2026,"claim":"Mapped BAZ1B's co-activator partnership and active-mark maintenance at transcribed loci, explaining isoform switching and Wnt de-repression upon its loss.","evidence":"CUT&RUN, transcriptome and histone PTM profiling, and locus-specific ChIP at TCF7L2 in WSTF knockout HCT116 cells","pmids":["42258541"],"confidence":"Medium","gaps":["Whether ASH2L/CBP recruitment is direct or via remodeling unresolved","Generality of isoform switching beyond profiled loci unclear"]},{"year":null,"claim":"How BAZ1B's distinct enzymatic (tyrosine kinase) and remodeling (WICH/WINAC) activities are coordinately deployed and selected across replication, transcription, repair, and inflammation contexts remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of the atypical kinase domain","No unified model linking activity selection to upstream signals","Direct ubiquitin-ligase role toward P21 rests on single low-confidence evidence (idx 19)"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,8]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1,2,5]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[2]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3,17,18]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,15,18]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[1,12,7]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,8,13]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,3,4,18]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[1,2,18]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[12]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[11,14]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[15]}],"complexes":["WICH","WINAC","B-WICH"],"partners":["SMARCA5","PCNA","ATAD5","ASH2L","CBP","MOF","SIRT1","NM1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UIG0","full_name":"Tyrosine-protein kinase BAZ1B","aliases":["Bromodomain adjacent to zinc finger domain protein 1B","Williams syndrome transcription factor","Williams-Beuren syndrome chromosomal region 10 protein","Williams-Beuren syndrome chromosomal region 9 protein","hWALp2"],"length_aa":1483,"mass_kda":170.9,"function":"Atypical tyrosine-protein kinase that plays a central role in chromatin remodeling and acts as a transcription regulator (PubMed:19092802). Involved in DNA damage response by phosphorylating 'Tyr-142' of histone H2AX (H2AXY142ph) (PubMed:19092802, PubMed:19234442). H2AXY142ph plays a central role in DNA repair and acts as a mark that distinguishes between apoptotic and repair responses to genotoxic stress (PubMed:19092802, PubMed:19234442). Regulatory subunit of the ATP-dependent WICH-1 and WICH-5 ISWI chromatin remodeling complexes, which form ordered nucleosome arrays on chromatin and facilitate access to DNA during DNA-templated processes such as DNA replication, transcription, and repair (PubMed:11980720, 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 (PubMed:28801535). The WICH-1 ISWI chromatin remodeling complex has a lower ATP hydrolysis rate than the WICH-5 ISWI chromatin remodeling complex (PubMed:28801535). The WICH-5 ISWI chromatin-remodeling complex regulates the transcription of various genes, has a role in RNA polymerase I transcription (By similarity). Within the B-WICH complex has a role in RNA polymerase III transcription (PubMed:16603771). Mediates the recruitment of the WICH-5 ISWI chromatin remodeling complex to replication foci during DNA replication (PubMed:15543136)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9UIG0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BAZ1B","classification":"Not Classified","n_dependent_lines":197,"n_total_lines":1208,"dependency_fraction":0.1630794701986755},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000009954","cell_line_id":"CID001131","localizations":[{"compartment":"chromatin","grade":3}],"interactors":[{"gene":"NUCKS1","stoichiometry":10.0},{"gene":"HMGN5","stoichiometry":4.0},{"gene":"NUMA1","stoichiometry":4.0},{"gene":"SMARCA1","stoichiometry":4.0},{"gene":"SMARCA5","stoichiometry":4.0},{"gene":"H1F0","stoichiometry":0.2},{"gene":"H2AFZ","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGA1","stoichiometry":0.2},{"gene":"HMGN2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001131","total_profiled":1310},"omim":[{"mim_id":"609757","title":"WILLIAMS-BEUREN REGION DUPLICATION SYNDROME","url":"https://www.omim.org/entry/609757"},{"mim_id":"609506","title":"CYTOCHROME P450, SUBFAMILY XXVIIB, POLYPEPTIDE 1; CYP27B1","url":"https://www.omim.org/entry/609506"},{"mim_id":"605681","title":"BROMODOMAIN ADJACENT TO ZINC FINGER DOMAIN, 1B; BAZ1B","url":"https://www.omim.org/entry/605681"},{"mim_id":"605680","title":"BROMODOMAIN ADJACENT TO ZINC FINGER DOMAIN, 1A; BAZ1A","url":"https://www.omim.org/entry/605680"},{"mim_id":"603375","title":"SWI/SNF-RELATED, MATRIX-ASSOCIATED, ACTIN-DEPENDENT REGULATOR OF CHROMATIN, SUBFAMILY A, MEMBER 5; SMARCA5","url":"https://www.omim.org/entry/603375"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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widely cited foundational study\",\n      \"pmids\": [\"19092802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"WSTF forms a two-subunit chromatin remodeling complex (WICH) with the ISWI ATPase (SNF2H in mouse, ISWI in Xenopus), purified to homogeneity; the complex catalyzes assembly of regularly spaced nucleosomal arrays in vitro and localizes to pericentric heterochromatin coincident with its replication.\",\n      \"method\": \"Biochemical purification from Xenopus egg extract, Co-IP with SNF2H in mouse cells, in vitro nucleosome assembly assay, immunofluorescence\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — complex purified to homogeneity, in vitro activity demonstrated, localization confirmed by IF; replicated across species\",\n      \"pmids\": [\"11980720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The WSTF bromodomain binds acetylated histones and is required for WINAC complex association with chromatin and ligand-induced VDR-mediated transrepression of the 1α-hydroxylase (CYP19A1) gene; a bromodomain deletion mutant acts as a dominant-negative.\",\n      \"method\": \"In vitro chromatin template assays, domain-deletion mutagenesis, dominant-negative rescue experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro chromatin assay with mutagenesis establishing bromodomain-acetyl histone interaction and functional consequence; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"16252006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The WICH complex (WSTF-SNF2h) interacts with nuclear myosin 1 (NM1) and associates with RNA polymerase I and rDNA; RNAi knockdown of WSTF reduces pre-rRNA synthesis in vivo, and antibodies to WSTF inhibit Pol I transcription on chromatin but not naked DNA.\",\n      \"method\": \"Biochemical fractionation, co-immunoprecipitation, ChIP, RNAi knockdown, in vitro transcription on chromatin templates\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, ChIP, RNAi with functional readout, and in vitro chromatin transcription assay; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"16514417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"WSTF-SNF2h (WICH) is part of a larger ~3 MDa assembly called B-WICH that also contains NM1, Sf3b155, RNA helicase II/Gualpha, Myb-binding protein 1a, CSB, and the proto-oncogene Dek; WSTF-SNF2h-NM1 is associated with RNA Pol III genes (5S rRNA, 7SL), and post-transcriptional silencing of WSTF reduces these Pol III transcripts.\",\n      \"method\": \"Biochemical fractionation, co-immunoprecipitation, ChIP, RNAi knockdown with transcript-level quantification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, ChIP, and RNAi with functional readout; single lab\",\n      \"pmids\": [\"16603771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"WSTF is an indispensable shared subunit of both WINAC (SWI/SNF-type) and WICH (ISWI-type) complexes in vivo: WSTF knockout mice show neonatal lethality with cardiovascular defects linked to impaired WINAC-dependent transcription at the Gja5 promoter, and impaired WICH-dependent SNF2H recruitment to PCNA and reduced cell survival after DNA damage—each defect rescued by overexpression of the respective complex components.\",\n      \"method\": \"WSTF knockout mouse generation, genetic rescue by complex-component overexpression (epistasis), MEF cell assays, ChIP, co-IP with PCNA\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with defined molecular phenotype, genetic rescue establishing pathway position for two distinct complexes, multiple orthogonal methods\",\n      \"pmids\": [\"19470456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"WSTF (within WICH) binds PCNA and localizes to replication foci; depletion of WSTF results in decreased chromatin accessibility on newly replicated DNA and global heterochromatin formation, implicating WICH in epigenetic inheritance through post-replication nucleosome remodeling.\",\n      \"method\": \"Co-IP with PCNA, immunofluorescence at replication foci, WSTF depletion with chromatin accessibility assay\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PCNA interaction, localization, and depletion phenotype; review/perspective with original data elements, single lab\",\n      \"pmids\": [\"15753658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"WSTF (WICH complex) transiently associates with the inactive X chromosome during late S-phase coincident with Xi DNA replication, and this elevated association precedes BRCA1 and γ-H2A.X recruitment, suggesting a distinct role in heterochromatin maturation post-replication.\",\n      \"method\": \"Immunofluorescence, cell-cycle staging, sequential localization analysis on Xi\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by IF with temporal resolution and functional inference; single lab, localization without full functional dissection\",\n      \"pmids\": [\"23166813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"WSTF-generated constitutive H2AX-pTyr142 associates with RNA polymerase II and active transcription; ATM-dependent EYA1/3 phosphatases remove this mark to silence transcription at DNA damage sites; subsequent re-phosphorylation by WSTF translocating to lesions facilitates transcription-coupled homologous recombination (TC-HR) in G1, using RNAPII-dependent RNA as donor templates.\",\n      \"method\": \"Co-IP of pTyr142-H2AX with RNAPII, ATM inhibition, EYA1/3 knockdown, WSTF knockdown, RAD51/RPA32 ChIP, HR reporter assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple co-IP, ChIP, and knockdown experiments with mechanistic pathway placement; single lab\",\n      \"pmids\": [\"31045206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WSTF is acetylated at Lys426 by MOF acetyltransferase and deacetylated by SIRT1; MSL1v1 bridges WSTF and MOF for this acetylation. K426 acetylation promotes WSTF Ser158 phosphorylation and enhances both kinase and transcriptional regulatory activities of WSTF.\",\n      \"method\": \"Mass spectrometry identification of acetylation site, in vitro and in vivo acetylation assays with MOF/SIRT1, co-IP, mutagenesis (K426R), functional proliferation/invasion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PTM site identified by MS, writer/eraser identified by co-IP and in vitro assay, mutagenesis confirms functional consequence; single lab\",\n      \"pmids\": [\"32518374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"WSTF overexpression activates PI3K/Akt and IL-6/STAT3 oncogenic signaling pathways to promote EMT (upregulation of fibronectin, N-cadherin, Snail, Slug, Twist; downregulation of E-cadherin) and increases lung cancer cell proliferation and invasion; these effects are reversed by PI3K or STAT3 inhibitors.\",\n      \"method\": \"cDNA overexpression, shRNA knockdown, cDNA microarray, qRT-PCR, western blot for EMT markers, pharmacological inhibition, xenograft models\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — OE and KD with pathway inhibitor rescue, in vivo xenograft; single lab, pathway placement through pharmacological epistasis\",\n      \"pmids\": [\"27449264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BAZ1B haploinsufficiency causes transcriptional dysregulation enriched for neurogenesis and neuron differentiation genes (identified by ChIP-seq); BAZ1B loss activates Wnt signaling and impairs neurogenic commitment in neural progenitor cells, and this differentiation defect is rescued by inhibiting over-active Wnt signaling.\",\n      \"method\": \"ChIP-seq of BAZ1B targets in iPSC-derived neurons, RNA-seq of WS patient-derived neurons, BAZ1B haploinsufficiency models, Wnt inhibitor rescue\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq target mapping, transcriptomics, patient-derived cells, genetic rescue by Wnt inhibition; multiple orthogonal methods establishing pathway position\",\n      \"pmids\": [\"26755828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BAZ1B localizes to the mitotic chromosome axis (scaffold) and knockout of BAZ1B in chicken DT40 cells causes prophase delay due to altered chromosome condensation timing and mitosis progression errors; simultaneous knockout of BAZ1A aggravates this phenotype.\",\n      \"method\": \"Quantitative proteomics of mitotic chromosome scaffold, CRISPR/Cas9 knockout, live-cell imaging, microscopy of condensation timing\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics localization plus KO with defined mitotic phenotype; single lab, chicken model\",\n      \"pmids\": [\"30266865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BAZ1B (as part of the WICH complex) interacts with ATAD5, and the BAZ1B-binding region on ATAD5 overlaps the UAF1-binding domain; BAZ1B binding to ATAD5 prevents premature de-ubiquitination of mono-ubiquitinated PCNA after oxidative DNA damage, and disruption of this interaction increases cellular sensitivity to oxidative stress.\",\n      \"method\": \"Co-IP of BAZ1B with ATAD5, domain mapping, WSTF binding-deficient ATAD5 mutants, Ub-PCNA de-ubiquitination kinetics assay, oxidative stress survival assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, domain mapping, functional mutant with defined molecular and cellular phenotype; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"39627214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BAZ1B is a key regulator of neural crest stem cell (NCSC) induction and migration in vitro, and controls NC-specific transcriptional circuits and distal regulatory elements, as established by functional dissection in patient-derived iPSC-NCSCs from WS and atypical 7q11.23 CNV patients.\",\n      \"method\": \"iPSC differentiation to NCSC, migration assays, ChIP/ATAC-seq, transcriptome analysis in BAZ1B haploinsufficiency and overexpression patient-derived cells\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived cell models with functional migration and transcriptional assays; single study, multiple omics methods\",\n      \"pmids\": [\"31840056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"During chronic (but not acute) inflammation, WSTF interacts with the ATG8 autophagy protein family in the nucleus, leading to WSTF nuclear export and degradation by autophagosomes/lysosomes; loss of WSTF opens chromatin over inflammatory genes and amplifies NF-κB-driven inflammation; cell-penetrating peptides blocking WSTF-ATG8 interaction suppress chronic inflammation in MASH and osteoarthritis mouse models.\",\n      \"method\": \"Co-IP of WSTF with ATG8 family members, nuclear fractionation, autophagy flux assays, WSTF knockout/knockdown, ATAC-seq, NF-κB reporter, in vivo mouse models (MASH, osteoarthritis), cell-penetrating peptide inhibitor\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP, nuclear fractionation, multiple KO/KD models, chromatin accessibility, in vivo mouse models, peptide inhibitor rescue; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"40604282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BAZ1B (WSTF) is dispensable for H2AX Tyr142 phosphorylation on sex chromosomes during meiosis and for male fertility; conditional BAZ1B deletion in spermatocytes causes ectopic γH2AX on synapsed autosomes at early pachytene but does not affect sex chromosome silencing or SNF2H localization during meiosis—demonstrating context-dependent roles distinct from somatic cells.\",\n      \"method\": \"Conditional BAZ1B knockout in mouse spermatocytes, immunofluorescence for pTyr142/γH2AX, fertility assays, SMARCA5 localization\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined meiotic phenotypes; negative results for some functions are mechanistically informative; single lab\",\n      \"pmids\": [\"25979708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"WSTF acts as a comodulator bound to the CYP19A1 (aromatase) promoter and is required for its transcriptional activity; treatment with vitamin D analog EB1089 causes WSTF dissociation from the promoter (detected by ChIP/Re-ChIP), and WSTF gene silencing reduces CYP19A1 expression and aromatase activity.\",\n      \"method\": \"ChIP, Re-ChIP, siRNA-mediated WSTF silencing, qRT-PCR, aromatase activity assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP/Re-ChIP establishes promoter occupancy, siRNA with functional readout; single lab, two orthogonal methods\",\n      \"pmids\": [\"23085504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"WSTF localizes to promoters and gene bodies of actively transcribed loci together with co-activators ASH2L and CBP; WSTF loss depletes ASH2L/CBP at these loci, causes loss of H3K4me2 and multiple acetylation marks, gain of Polycomb components, widespread isoform switching, and activates Wnt/β-catenin signaling—with TCF7L2 showing locus-specific isoform switching due to gene-body loss of active marks.\",\n      \"method\": \"CUT&RUN chromatin profiling, transcriptome profiling, histone PTM analysis, microscopy in WSTF knockout HCT116 cells; locus-specific ChIP validation at TCF7L2\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CUT&RUN, transcriptomics, and histone modification profiling in engineered KO cells; single lab, multiple orthogonal omics methods\",\n      \"pmids\": [\"42258541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"BAZ1B mediates ubiquitination-dependent degradation of P21 (CDKN1A); BAZ1B knockdown suppresses this degradation, leading to P21 accumulation, cellular senescence, and trophoblast dysfunction in a 6PPD-exposure model; supplementation with Baz1b or P21 downregulation rescues placental senescence in vivo.\",\n      \"method\": \"BAZ1B knockdown/overexpression in trophoblast cells, ubiquitination assays, western blot for P21, mouse 6PPD exposure model with Baz1b rescue\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ubiquitination assay and KD/OE with single mechanistic claim; single lab, limited orthogonal validation of direct BAZ1B-P21 ubiquitination\",\n      \"pmids\": [\"42224779\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BAZ1B (WSTF) is a multifunctional chromatin remodeler that operates as the regulatory subunit of two distinct ATP-dependent complexes—WICH (with ISWI/SNF2H, involved in replication-coupled chromatin assembly, PCNA interaction, DNA damage response, and Pol I/III transcription) and WINAC (SWI/SNF-type, involved in nuclear receptor-mediated transcription)—and additionally possesses intrinsic tyrosine kinase activity that phosphorylates H2A.X Tyr142 to regulate the DNA damage response and transcription-coupled homologous recombination; its bromodomain binds acetylated histones to recruit complexes to chromatin, it is itself regulated by MOF-mediated K426 acetylation and SIRT1 deacetylation, it interacts with ATAD5 to prevent premature PCNA de-ubiquitination, and during chronic inflammation its nuclear interaction with ATG8 family proteins triggers its autophagosomal degradation, thereby controlling chromatin accessibility over inflammatory genes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BAZ1B (WSTF) is a multifunctional chromatin regulator that serves as the indispensable, shared regulatory subunit of two distinct ATP-dependent remodeling complexes—the ISWI-type WICH (with SNF2H) and the SWI/SNF-type WINAC—coupling chromatin remodeling to replication, transcription, and the DNA damage response [#5, #2, #1]. Within WICH, BAZ1B binds PCNA and localizes to replication foci, where it maintains chromatin accessibility on newly replicated DNA and contributes to post-replication heterochromatin maturation, including transient association with the inactive X chromosome [#6, #7]; it also assembles into the larger B-WICH complex with nuclear myosin 1 and other factors to promote RNA Pol I and Pol III transcription of rDNA and 5S/7SL genes [#3, #4]. BAZ1B carries an atypical intrinsic tyrosine kinase activity—housed in a domain unrelated to canonical kinase folds—that phosphorylates H2A.X on Tyr142 to regulate the DNA damage response, and this mark, dynamically removed by EYA phosphatases and re-deposited by BAZ1B, governs transcription-coupled homologous recombination [#0, #8]. Its bromodomain reads acetylated histones to dock WINAC on chromatin and direct nuclear-receptor-mediated transcription, including VDR-dependent regulation of CYP19A1 [#2, #17]. BAZ1B occupies active loci alongside ASH2L and CBP to maintain H3K4me2 and histone acetylation and restrain Polycomb and Wnt/β-catenin signaling, and its haploinsufficiency dysregulates neurogenic and neural-crest transcriptional programs through aberrant Wnt activation [#18, #11, #14]. BAZ1B also acts at the mitotic chromosome scaffold to time chromosome condensation [#12], interacts with ATAD5 to prevent premature de-ubiquitination of PCNA after oxidative damage [#13], and during chronic inflammation is exported and degraded via nuclear ATG8 interaction, opening chromatin over NF-κB-driven inflammatory genes [#15]. BAZ1B activity is tuned by MOF-mediated K426 acetylation and SIRT1 deacetylation [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established BAZ1B as the targeting subunit of a defined ISWI-family remodeling complex, answering what biochemical machine WSTF operates within.\",\n      \"evidence\": \"Biochemical purification of WICH from Xenopus extract, Co-IP with SNF2H, in vitro nucleosome spacing assay, and IF at pericentric heterochromatin\",\n      \"pmids\": [\"11980720\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the in vivo essentiality of the complex\", \"Did not connect remodeling to a specific physiological output\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected WICH to DNA replication by showing BAZ1B binds PCNA and maintains open chromatin on nascent DNA, framing a role in epigenetic inheritance.\",\n      \"evidence\": \"Co-IP with PCNA, IF at replication foci, and WSTF depletion with chromatin accessibility readout\",\n      \"pmids\": [\"15753658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of accessibility maintenance not resolved at nucleotide resolution\", \"Did not test downstream heritability of marks directly\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Assigned a transcriptional function to the BAZ1B bromodomain as an acetyl-histone reader required to recruit WINAC for nuclear-receptor signaling.\",\n      \"evidence\": \"In vitro chromatin template assays, bromodomain-deletion mutagenesis, and dominant-negative rescue at the CYP19A1/VDR axis\",\n      \"pmids\": [\"16252006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetyl-lysine specificity of the bromodomain not fully mapped\", \"Composition of WINAC not exhaustively defined here\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended BAZ1B function to RNA polymerase I and III transcription as part of the larger B-WICH assembly, broadening its role beyond replication.\",\n      \"evidence\": \"Biochemical fractionation, reciprocal Co-IP with NM1/Pol I and Pol III genes, ChIP, RNAi with transcript-level readouts, and in vitro chromatin transcription\",\n      \"pmids\": [\"16514417\", \"16603771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether remodeling versus scaffolding drives transcriptional support is unresolved\", \"Direct catalytic contribution of WSTF kinase to Pol I/III not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed an unprecedented intrinsic tyrosine kinase activity in BAZ1B targeting H2A.X Tyr142, defining a direct enzymatic role in the DNA damage response.\",\n      \"evidence\": \"In vitro kinase assays, active-site characterization, mutagenesis, and MS identification of the Tyr142 phosphosite\",\n      \"pmids\": [\"19092802\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the atypical kinase fold not solved\", \"Full substrate repertoire beyond H2A.X not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated in vivo that BAZ1B is the obligate shared subunit of both WINAC and WICH, separating its transcriptional and replication/repair functions genetically.\",\n      \"evidence\": \"WSTF knockout mouse with cardiovascular phenotype, complex-component overexpression rescue (epistasis), MEF assays, ChIP, and PCNA Co-IP\",\n      \"pmids\": [\"19470456\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific division of the two complexes not mapped\", \"Relative contribution of kinase activity to the knockout phenotype not isolated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed BAZ1B temporally at the replicating inactive X and at the CYP19A1 promoter, refining its roles in heterochromatin maturation and nuclear-receptor-regulated transcription.\",\n      \"evidence\": \"IF with cell-cycle staging on Xi; ChIP/Re-ChIP and siRNA with aromatase activity readouts at CYP19A1\",\n      \"pmids\": [\"23166813\", \"23085504\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal role of Xi association in silencing not established\", \"How ligand triggers WSTF promoter dissociation is unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked BAZ1B dosage to developmental gene programs and oncogenic signaling, connecting chromatin function to neurogenesis and tumor phenotypes.\",\n      \"evidence\": \"ChIP-seq/RNA-seq in patient-derived neurons with Wnt-inhibitor rescue; overexpression/knockdown with PI3K/STAT3 inhibitor rescue and xenografts in lung cancer\",\n      \"pmids\": [\"26755828\", \"27449264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect control of Wnt target genes not fully separated\", \"Whether oncogenic signaling depends on remodeling or kinase activity unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified a mitotic role for BAZ1B at the chromosome scaffold controlling condensation timing, distinct from its interphase chromatin functions.\",\n      \"evidence\": \"Quantitative proteomics of mitotic chromosome scaffold and CRISPR knockout with live-cell imaging in DT40 cells, aggravated by BAZ1A co-deletion\",\n      \"pmids\": [\"30266865\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular target on the axis not identified\", \"Whether SNF2H is required for this role untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved how the H2AX-pTyr142 mark is dynamically regulated to switch between transcription and transcription-coupled homologous recombination at lesions.\",\n      \"evidence\": \"Co-IP of pTyr142-H2AX with RNAPII, ATM inhibition, EYA1/3 and WSTF knockdown, RAD51/RPA32 ChIP, and HR reporter assays; plus iPSC-NCSC functional dissection of neural-crest circuits\",\n      \"pmids\": [\"31045206\", \"31840056\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct demonstration of RNA template use during TC-HR incomplete\", \"Kinetics of WSTF translocation to lesions not fully defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed context dependence of BAZ1B function by demonstrating it is dispensable for H2AX Tyr142 phosphorylation in meiotic sex chromosome silencing despite its somatic kinase role.\",\n      \"evidence\": \"Conditional BAZ1B knockout in mouse spermatocytes with IF for pTyr142/γH2AX, fertility assays, and SMARCA5 localization\",\n      \"pmids\": [\"25979708\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the compensating meiotic kinase unknown\", \"Mechanism of the early-pachytene ectopic γH2AX phenotype unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined an acetylation switch controlling BAZ1B activity, showing post-translational tuning of its kinase and transcriptional functions.\",\n      \"evidence\": \"MS site mapping of K426, in vitro/in vivo acetylation with MOF/SIRT1, MSL1v1-bridged Co-IP, K426R mutagenesis, and proliferation/invasion assays\",\n      \"pmids\": [\"32518374\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How K426 acetylation mechanistically promotes Ser158 phosphorylation unclear\", \"In vivo physiological context of the switch not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified the BAZ1B–ATAD5 interaction as a mechanism protecting mono-ubiquitinated PCNA from premature de-ubiquitination after oxidative damage.\",\n      \"evidence\": \"Reciprocal Co-IP, domain mapping (overlap with UAF1-binding region), binding-deficient ATAD5 mutants, Ub-PCNA de-ubiquitination kinetics, and oxidative stress survival assays\",\n      \"pmids\": [\"39627214\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether WICH remodeling is required for this protective role untested\", \"Structural detail of the competition with UAF1 not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established a nuclear autophagy mechanism whereby ATG8-mediated degradation of BAZ1B opens inflammatory chromatin during chronic inflammation, with therapeutic implications.\",\n      \"evidence\": \"Co-IP with ATG8 family, nuclear fractionation, autophagy flux assays, KO/KD models, ATAC-seq, NF-κB reporter, MASH/osteoarthritis mouse models, and cell-penetrating peptide inhibitor rescue\",\n      \"pmids\": [\"40604282\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger that converts acute to chronic ATG8 engagement not defined\", \"Whether kinase or remodeling activity of retained WSTF restrains inflammation untested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Mapped BAZ1B's co-activator partnership and active-mark maintenance at transcribed loci, explaining isoform switching and Wnt de-repression upon its loss.\",\n      \"evidence\": \"CUT&RUN, transcriptome and histone PTM profiling, and locus-specific ChIP at TCF7L2 in WSTF knockout HCT116 cells\",\n      \"pmids\": [\"42258541\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ASH2L/CBP recruitment is direct or via remodeling unresolved\", \"Generality of isoform switching beyond profiled loci unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How BAZ1B's distinct enzymatic (tyrosine kinase) and remodeling (WICH/WINAC) activities are coordinately deployed and selected across replication, transcription, repair, and inflammation contexts remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the atypical kinase domain\", \"No unified model linking activity selection to upstream signals\", \"Direct ubiquitin-ligase role toward P21 rests on single low-confidence evidence (idx 19)\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1, 2, 5]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3, 17, 18]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 15, 18]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [1, 12, 7]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 8, 13]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 3, 4, 18]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [1, 2, 18]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [11, 14]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [\n      \"WICH\",\n      \"WINAC\",\n      \"B-WICH\"\n    ],\n    \"partners\": [\n      \"SMARCA5\",\n      \"PCNA\",\n      \"ATAD5\",\n      \"ASH2L\",\n      \"CBP\",\n      \"MOF\",\n      \"SIRT1\",\n      \"NM1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}