{"gene":"BPTF","run_date":"2026-04-28T17:12:38","timeline":{"discoveries":[{"year":2006,"finding":"The PHD finger of BPTF specifically recognizes histone H3 trimethylated at K4 (H3K4me3) through anti-parallel beta-sheet formation on the PHD finger surface, with the long side chains of R2 and K4me3 fitting into adjacent pre-formed surface pockets bracketing an invariant tryptophan. Crystal and NMR structures of the bromodomain-proximal PHD finger in free and H3K4me3-bound states were determined, and key specificity-determining residues were identified by point mutagenesis.","method":"X-ray crystallography, NMR spectroscopy, peptide binding assays, PHD finger point mutagenesis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — crystal structure + NMR + mutagenesis in a single rigorous study","pmids":["16728978"],"is_preprint":false},{"year":2001,"finding":"BPTF (NURF301), the largest subunit of the NURF complex, together with the ISWI ATPase is necessary and sufficient for accurate and efficient nucleosome sliding in vitro. An HMGA/HMGI(Y)-like domain of NURF301 facilitates nucleosome sliding, implicating DNA conformational changes in the sliding mechanism. NURF301 also directly interacts with sequence-specific transcription factors, providing a basis for targeted recruitment of the NURF complex to specific genes.","method":"Reconstitution of full and partial NURF complexes from recombinant proteins, in vitro nucleosome sliding assay, interaction studies with transcription factors","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro with defined subunit requirements and multiple functional assays","pmids":["11583616"],"is_preprint":false},{"year":2009,"finding":"In Drosophila, alternative splicing of NURF301/BPTF generates distinct NURF complexes with differing histone modification binding specificities. Full-length NURF301 contains a C-terminal bromodomain and PHD finger that bind H3K4me3 and H4K16Ac respectively; a truncated isoform lacking these domains assembles a complex deficient in these marks. Full-length NURF301 (but not the truncated isoform) is required for spermatogenesis and expression of spermatid differentiation genes.","method":"Isoform characterization, microarray expression profiling, genetic mutant analysis, chromatin reader binding assays","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including binding assays, genetics, and expression profiling in vivo","pmids":["19629165"],"is_preprint":false},{"year":2018,"finding":"The conformation of histone H3 tails within nucleosomes is inhibitory to BPTF PHD finger binding. The H3 tails interact robustly but dynamically with nucleosomal DNA, substantially reducing PHD finger association compared to free peptide. Altering the electrostatics of the H3 tail via post-translational modification or mutation increases accessibility to the PHD finger, indicating that PTM crosstalk regulates effector domain binding by altering nucleosome conformation.","method":"NMR spectroscopy, molecular dynamics (MD) simulations, binding assays with nucleosomes vs. peptides","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 — NMR + MD simulations with orthogonal functional validation in nucleosome context","pmids":["29648537"],"is_preprint":false},{"year":2008,"finding":"Bptf is required in mouse embryos for establishment of a functional distal visceral endoderm and proper gastrulation. Bptf-null embryos implant but fail to establish anterior visceral endoderm and primitive streak. Bptf physically and functionally interacts with Smad transcription factors (Smad2/3) and may co-regulate gene targets of the TGF-β/Smad pathway essential for early mouse development.","method":"Knockout mouse analysis, lineage marker histology, microarray, embryoid body differentiation assays, co-immunoprecipitation (physical link to Smad factors)","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with defined phenotype + physical interaction + transcriptomic profiling","pmids":["18974875"],"is_preprint":false},{"year":2008,"finding":"BPTF/FAC1 is essential for trophoblast differentiation during early mouse development; its loss causes failure of ectoplacental cone development and embryonic lethality by E6.5. Development of the anterior visceral endoderm and primitive streak is also impaired in BPTF-null embryos.","method":"Loss-of-function mouse allele, histological analysis with lineage markers","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — knockout mouse with defined embryonic phenotype and multiple lineage markers","pmids":["18794365"],"is_preprint":false},{"year":2015,"finding":"BPTF physically interacts with c-MYC and is required for the full c-MYC transcriptional program in fibroblasts. BPTF knockdown leads to decreased c-MYC recruitment to DNA and changes in chromatin accessibility. In Bptf-null MEFs, BPTF is necessary for c-MYC-driven proliferation, G1-S progression, and replication stress but not c-MYC-driven apoptosis. In vivo, Bptf inactivation in pre-neoplastic pancreatic acinar cells significantly delays tumor development.","method":"Co-immunoprecipitation, ChIP-seq (chromatin accessibility), genetic KO MEFs, in vivo mouse tumor model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ChIP-seq, genetic KO with defined phenotypic readouts and in vivo validation","pmids":["26729287"],"is_preprint":false},{"year":2015,"finding":"In zebrafish, Bptf physically and functionally interacts with phospho-Smad2 (activated by non-Nodal TGF-β signaling) to promote expression of wnt8a, a critical gene for neural posteriorization. Bptf and Smad2 directly bind to and activate the wnt8a promoter by recruiting the NURF remodeling complex, and loss of Bptf increases nucleosome density on the wnt8a promoter.","method":"Morpholino knockdown in zebrafish, co-immunoprecipitation, ChIP (nucleosome density and factor binding at wnt8a promoter), reporter assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — physical interaction + ChIP + functional epistasis in vivo","pmids":["26041917"],"is_preprint":false},{"year":2017,"finding":"BPTF maintains chromatin accessibility at enhancer regions in mammary epithelial cells (MECs) and is essential for mammary gland stem cell (MaSC) self-renewal and differentiation. BPTF depletion arrests cells at an undefined stage of epithelial differentiation with incapacity to achieve luminal cell fate, associated with loss of open chromatin at enhancers.","method":"shRNA-mediated KD, ATAC-seq (genome-wide DNA accessibility), BPTF chemical inhibition, mammary repopulation assays","journal":"Stem cell reports","confidence":"High","confidence_rationale":"Tier 2 — KD/KO with genome-wide chromatin accessibility (ATAC-seq) and functional stem cell assays","pmids":["28579392"],"is_preprint":false},{"year":2018,"finding":"The BPTF bromodomain directly interacts with histone variant H2A.Z in a diacetylation-dependent manner (highest affinity for K4ac/K11ac diacetylation, Kd ~780 µM). This interaction was confirmed by protein-observed 19F NMR (PrOF NMR), 1H NMR CPMG experiments, and photo-cross-linking, and shows specificity over a panel of other bromodomains.","method":"PrOF NMR, CPMG NMR relaxation, photo-cross-linking, fluorescence anisotropy, peptide binding assays","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 — multiple orthogonal biophysical methods, single lab; weak affinity interaction","pmids":["28771339"],"is_preprint":false},{"year":2016,"finding":"MITF directly transcriptionally activates BPTF expression by binding to the BPTF promoter in melanoma cells, as shown by ChIP and luciferase reporter assays. BPTF transduces MITF-driven pro-survival signals including activation of BCL2, and BPTF overexpression rescues growth suppression caused by MITF silencing.","method":"ChIP, luciferase reporter assay, shRNA knockdown, cDNA rescue experiments","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + reporter assay + epistasis rescue, single lab","pmids":["27185926"],"is_preprint":false},{"year":2016,"finding":"BPTF is required for T cell homeostasis via a cell-intrinsic mechanism, and Treg cell-specific BPTF deletion leads to reduced Foxp3 expression, increased lymphocyte infiltration in non-lymphoid organs, and systemic autoimmune syndrome in mice.","method":"Conditional T cell-specific and Treg-specific Bptf knockout mice, flow cytometry, histology","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — clean conditional KO with defined cellular and immune phenotypes","pmids":["27799308"],"is_preprint":false},{"year":2016,"finding":"NURF (via BPTF) directly regulates expression of immunoproteasome subunit genes Psmb8 and Psmb9 and antigen transporter genes Tap1 and Tap2. BPTF silencing enhances tumor antigenicity through improved antigen processing, and PSMB8 inhibitor ONX-0914 reverses the effects of BPTF ablation.","method":"shRNA knockdown, gene expression analysis, PSMB8 inhibitor rescue experiments, co-culture cytotoxicity assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined molecular target genes and pharmacological rescue","pmids":["27651309"],"is_preprint":false},{"year":2017,"finding":"BPTF occupies heparanase (Hpse) regulatory elements and activates its expression, leading to increased heparanase activity, reduced cell surface abundance of heparan sulfate proteoglycans (HSPGs) and natural cytotoxicity receptor (NCR) co-ligands, thereby suppressing NK cell cytolytic activity against tumor cells.","method":"ChIP (BPTF at heparanase promoter), gain/loss-of-function experiments, in vivo NCR1 blocking, NK cell cytotoxicity assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP demonstrating direct occupancy + functional rescue with orthogonal approaches","pmids":["28969075"],"is_preprint":false},{"year":2018,"finding":"BPTF is required for maintaining the population of hematopoietic stem/progenitor cells (HSPCs) and long-term HSCs. Bptf-deficient HSCs are defective in reconstituted hematopoiesis. BPTF loss downregulates HSC-specific gene programs including master transcription factors Meis1, Pbx1, Mn1, and Lmo2, and reduces chromatin accessibility at key HSC 'stemness' genes.","method":"Conditional knockout mice (hematopoietic-specific), bone marrow reconstitution assays, RNA-seq, ATAC-seq","journal":"Stem cell reports","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with multiple orthogonal assays (RNA-seq, ATAC-seq, functional reconstitution)","pmids":["29456179"],"is_preprint":false},{"year":2018,"finding":"The lncRNA NMR directly binds to BPTF and recruits BPTF to chromatin to potentially promote expression of MMP3 and MMP10 via the ERK1/2 pathway in esophageal squamous cell carcinoma cells.","method":"RNA pulldown, Co-IP, ChIP","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 3 — RNA pulldown + ChIP showing recruitment, single lab","pmids":["29763634"],"is_preprint":false},{"year":2019,"finding":"BPTF cooperates with the p50 subunit of NF-κB to regulate COX-2 promoter activity and expression in lung cancer cells. BPTF is identified as a COX-2 promoter-binding protein by biotin-streptavidin-agarose pulldown and ChIP; BPTF knockdown abrogates p50 binding to the COX-2 promoter, and p50 inhibition reverses the effect of BPTF silencing on COX-2 expression.","method":"Biotin-streptavidin-agarose pulldown, mass spectrometry, ChIP, co-immunoprecipitation, luciferase reporter assay","journal":"American journal of translational research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods (pulldown, ChIP, Co-IP, reporter), single lab","pmids":["31934287"],"is_preprint":false},{"year":2000,"finding":"FAC1 (BPTF) interacts with the Myc-associated zinc finger protein ZF87/MAZ, as demonstrated by yeast two-hybrid and confirmed with recombinant protein in vitro. The ZF87/MAZ interaction domain was mapped to the region containing a putative NLS/NES of FAC1. FAC1 represses ZF87/MAZ-induced transcriptional activation of the SV40 promoter in a dose-dependent manner, and a FAC1 deletion mutant lacking the ZF87/MAZ interaction domain does not suppress ZF87/MAZ activation.","method":"Yeast two-hybrid, in vitro recombinant protein interaction, deletion mutant mapping, co-transfection luciferase reporter assay","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — yeast two-hybrid + in vitro confirmation + functional reporter assay with domain mapping","pmids":["10727212"],"is_preprint":false},{"year":1999,"finding":"FAC1 (BPTF) DNA binding activity is dramatically enhanced by phosphorylation; phosphatase treatment of nuclear extracts reduces FAC1 DNA binding affinity, and inhibition of serine/threonine phosphatases increases FAC1 DNA binding activity, indicating that FAC1 DNA binding is regulated by phosphorylation.","method":"DNA binding assays (EMSA), phosphatase treatment of nuclear extracts, pharmacological phosphatase inhibition","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — biochemical assays with pharmacological and enzymatic manipulation, single lab","pmids":["10403843"],"is_preprint":false},{"year":2022,"finding":"BPTF directly binds to the Cdc25A promoter (-178/+107 region) and transcriptionally activates Cdc25A expression, accelerating the cell cycle in colorectal cancer cells. BPTF itself is transcriptionally regulated by c-Myc, forming a c-Myc/BPTF/Cdc25A signaling axis.","method":"RNA-seq, DNA-pulldown, ChIP, luciferase reporter assay, siRNA/shRNA knockdown","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal approaches (ChIP, DNA-pulldown, reporter assay), single lab","pmids":["35932692"],"is_preprint":false},{"year":2021,"finding":"METTL14-mediated m6A modification negatively regulates the mRNA stability of BPTF. METTL14 deficiency leads to accumulation of BPTF, which remodels the enhancer landscape and constitutes super-enhancers activating downstream oncogenic targets such as ENO2 and SRC, leading to glycolytic reprogramming in renal cell carcinoma.","method":"MeRIP-seq, RNA-seq, ChIP-seq, ATAC-seq, cell line and organoid models, xenograft models","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple genomic approaches (MeRIP-seq, ChIP-seq, ATAC-seq) establishing mechanistic link, single lab","pmids":["33664855"],"is_preprint":false},{"year":2020,"finding":"hnRNPLL controls alternative splicing of Bptf during embryonic stem cell differentiation, promoting ES cell-preferred exon skipping events. hnRNPLL-mediated alternative splicing of Bptf (and Tbx3) is important for pluripotency exit; depletion of hnRNPLL leads to sustained expression of ES cell-preferred Bptf isoforms and differentiation deficiency.","method":"Functional RBP screen, hnRNPLL knockout mice, RNA-seq, splicing analysis","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — KO mice + transcriptomic profiling establishing isoform-specific function, single lab","pmids":["33349972"],"is_preprint":false},{"year":2019,"finding":"BPTF's impact on high-grade glioma growth is mediated through positive effects on expression of MYC and MYC pathway targets, as shown by shRNA screens in vitro/in vivo. BPTF depletion reduces tumor self-renewal capacity and leads to more neuronal characteristics.","method":"In vitro/in vivo epigenomic shRNA inhibition screen, gene expression analysis, neurosphere self-renewal assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo shRNA screen with functional and transcriptomic readouts, single lab","pmids":["31844250"],"is_preprint":false},{"year":2024,"finding":"BPTF interacts with MYCN and core regulatory circuitry (CRC) transcription factors in neuroblastoma, as shown by immunoprecipitation/mass spectrometry. Genome-wide BPTF distribution shows dual roles: co-localization with MYCN/MYC at cell cycle gene promoters, and co-localization with CRC transcription factors at super-enhancers to regulate cell identity.","method":"Immunoprecipitation/mass spectrometry, bulk RNA-seq, single-cell sequencing, ChIP-seq, tissue microarrays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — IP/MS with genome-wide ChIP-seq, multiple approaches; preprint","pmids":["38405949"],"is_preprint":true},{"year":2024,"finding":"BPTF regulates androgen receptor (AR) activity in prostate cancer by increasing chromatin accessibility at AR binding sites (through SMARCA1, the catalytic NURF subunit) and by forming a protein complex with AR and FOXA1 in which FOXA1 recruits the BPTF-AR complex to chromatin while BPTF stabilizes the AR-FOXA1 interaction. BPTF interacts with AR through its bromodomain, and bromodomain inhibition disrupts this interaction and impairs AR signaling.","method":"RNA-seq, ChIP-seq, ATAC-seq, Co-IP, bromodomain inhibitor treatment, BPTF knockdown","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple genomic and biochemical orthogonal methods (ChIP-seq, ATAC-seq, Co-IP, inhibitor validation), single lab but rigorous","pmids":["41381516"],"is_preprint":false},{"year":2025,"finding":"BPTF's PHD finger interprets H3K4me3 on HCC cells to hinder their recognition by NK cells. PROTAC-mediated degradation of BPTF directly enhances the abundance of natural cytotoxicity receptor ligands on HCC cells, facilitating recognition and cytotoxicity by NK cells both in vitro and in vivo.","method":"PROTAC degrader, NK cell cytotoxicity assays, flow cytometry for NCR ligand expression, in vivo xenograft models","journal":"Molecular therapy","confidence":"Medium","confidence_rationale":"Tier 2 — PROTAC degradation with functional immune assays and in vivo validation, single lab","pmids":["39935175"],"is_preprint":false},{"year":2020,"finding":"BPTF is required for normal B-cell differentiation and c-MYC-driven B-cell lymphomagenesis. Haploinsufficiency of Bptf delays lymphomagenesis in Eμ-Myc mice. Tumors arising in a Bptf heterozygous background display decreased c-MYC levels and pathway activity, and increased NF-κB pathway activation.","method":"Eμ-Myc transgenic mouse model with conditional Bptf deletion, gene expression analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo genetic epistasis in mouse lymphoma model with molecular pathway analysis","pmids":["32451433"],"is_preprint":false},{"year":2023,"finding":"PHF6 physically interacts with BPTF and recruits it to mediate epigenetic remodeling to augment HIF transcriptional activity in breast cancer cells. PHF6 also physically interacts with HIF-1α and HIF-2α to potentiate HIF-driven transcriptional events.","method":"Co-immunoprecipitation, ChIP-qPCR, CRISPR HIF double knockout","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP with ChIP validation, single lab","pmids":["36967443"],"is_preprint":false},{"year":2022,"finding":"BPTF promotes COX-2 expression by facilitating VEGF promoter occupancy; lumbrokinase downregulates BPTF expression, decreases its anchoring at the VEGF promoter region, and thereby suppresses VEGF expression in NSCLC cells.","method":"ChIP (BPTF at VEGF promoter), Western blot, siRNA knockdown","journal":"Biomolecules","confidence":"Low","confidence_rationale":"Tier 3 — ChIP in a pharmacological context, single lab, indirect readout","pmids":["39062456"],"is_preprint":false},{"year":2024,"finding":"NUP98-BPTF fusion protein promotes transformation of NIH3T3 fibroblasts by transcriptionally upregulating Pim1 through binding to its promoter, and activates MYC and mTORC1 signaling. PIM1 knockdown or pharmacological mTORC1 inhibition suppresses NUP98-BPTF-induced transformation. NUP98-BPTF also enhances survival of Jurkat T-ALL cells by inactivating the pro-apoptotic protein BAD.","method":"Lentiviral inducible expression in NIH3T3 and Jurkat cells, ChIP (binding to Pim1 promoter), shRNA/inhibitor rescue experiments","journal":"Cancer medicine","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP showing direct promoter binding + functional rescue, single lab","pmids":["38940430"],"is_preprint":false},{"year":2025,"finding":"Molecular dynamics simulations reveal that BPTF PHD finger and bromodomain adopt distinct conformational states depending on binding context; nucleosome engagement induces compaction of the multidomain structure. PHD finger binding displaces the H3 tail from nucleosomal DNA, increasing H3 tail flexibility and promoting compensatory binding of the H4 tail to DNA, weakening overall hydrogen bonding with DNA and suggesting localized nucleosome destabilization.","method":"Molecular dynamics (MD) simulations","journal":"Biophysical journal","confidence":"Low","confidence_rationale":"Tier 4 — computational only, no direct experimental validation in this study","pmids":["40616262"],"is_preprint":false},{"year":2025,"finding":"Using nucleosome mass spectrometry, the BPTF PHD-bromodomain native tandem reader was shown to require coincident H3K4me3 together with K9ac, K14ac, and K18ac for effective nucleosome engagement, demonstrating multivalent combinatorial histone modification readout.","method":"Nucleosome mass spectrometry (Nuc-MS), native top-down MS","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 1 — novel mass spectrometry method with direct protein-nucleosome readout; preprint","pmids":["bio_10.1101_2025.05.01.651740"],"is_preprint":true},{"year":2024,"finding":"BPTF activates hTERT expression transcriptionally in hepatocellular carcinoma cells, as shown by knockdown experiments demonstrating that BPTF loss reduces hTERT expression and inhibits stem cell traits and tumor growth.","method":"shRNA knockdown, Western blot, xenograft mouse model","journal":"Redox biology","confidence":"Low","confidence_rationale":"Tier 3 — KD with phenotype but mechanistic link (direct promoter binding) not established by ChIP","pmids":["30419422"],"is_preprint":false},{"year":2024,"finding":"BPTF regulates FOXC1 protein stability in glioma via USP34-mediated de-ubiquitination; BPTF knockdown reduces FOXC1 protein levels and inhibits glioma cell proliferation, apoptosis, and migration. The interaction between BPTF and USP34, and the effect on FOXC1 ubiquitination, was demonstrated by immunoprecipitation assays.","method":"Co-immunoprecipitation, ubiquitination assay, Western blot, shRNA knockdown, functional cell assays","journal":"Histology and histopathology","confidence":"Low","confidence_rationale":"Tier 3 — Co-IP plus functional assay, single lab, no structural or reconstitution data","pmids":["38686761"],"is_preprint":false},{"year":2025,"finding":"BPTF primarily affects chromatin accessibility at gene promoters near transcription start sites in planarian stem cells; BPTF-dependent loss of accessibility and gene expression is greatest at genes marked by Set1-dependent H3K4me3 (with broader peaks) but not MLL1/2-dependent H3K4me3. Loss of bptf phenocopies Set1 knockdown.","method":"RNAi knockdown in planarians, ATAC-seq, RNA-seq, genetic epistasis with Set1","journal":"BMC genomics","confidence":"Medium","confidence_rationale":"Tier 2 — ATAC-seq + RNA-seq + genetic epistasis in vivo organism, single lab","pmids":["40069606"],"is_preprint":false},{"year":2025,"finding":"BPTF bromodomain directly interacts with acetylated H2A.Z isoforms in an affinity-dependent and acetyl-lysine binding pocket-specific manner, as validated by photoaffinity probes with diazirine photo-crosslinking in both recombinant BPTF and in nuclear lysates from A549 lung cancer cells. Endogenous BPTF was enriched by acetylated H2A.Z probes, though to a lesser extent than the canonical H4K16ac partner.","method":"Photoaffinity crosslinking probes, SDS-PAGE, pulldown from nuclear lysates, bottom-up proteomics for histone acetylation quantification","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — photoaffinity crosslinking in both recombinant and cell lysate contexts with pocket-specific controls","pmids":["40864556"],"is_preprint":false},{"year":2024,"finding":"BPTF binds directly to the promoter region of the Slug gene and activates Slug transcription, thereby promoting trophoblast epithelial-to-mesenchymal transition (EMT). BPTF knockdown prevents EMT and attenuates trophoblast invasion in vitro.","method":"shRNA knockdown, ChIP (BPTF at Slug promoter), invasion assays","journal":"Gene","confidence":"Low","confidence_rationale":"Tier 3 — ChIP + KD functional assay, single lab","pmids":["38521110"],"is_preprint":false},{"year":2006,"finding":"In C. elegans, ISW-1 (ISWI ortholog) acts as part of a NURF-like complex with NURF-1 (NURF301/BPTF ortholog) to promote vulval cell-fate specification by antagonizing the transcriptional activities of Myb-MuvB/dREAM, NuRD, and Tip60/NuA4 complexes. Mutations in isw-1 and nurf-1 suppress both the synMuv phenotype and the multivulva phenotype caused by Ras pathway overactivation.","method":"Genetic suppressor screen, double-mutant epistasis analysis in C. elegans","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with multiple alleles and pathways, ortholog functional study","pmids":["16774993"],"is_preprint":false}],"current_model":"BPTF is the largest subunit and NURF-specific scaffolding component of the ATP-dependent NURF chromatin remodeling complex (with ISWI/SMARCA1 as the catalytic ATPase), where it reads histone H3K4me3 via its PHD finger (recognition inhibited by H3 tail-DNA contacts in the nucleosome context) and acetylated histones via its bromodomain, thereby recruiting NURF to specific chromatin loci to promote nucleosome sliding and increase chromatin accessibility at target gene promoters and enhancers; BPTF physically interacts with and facilitates the chromatin occupancy and transcriptional activity of oncogenic transcription factors including c-MYC, MYCN, AR, Smad2, and NF-κB p50, and is required for stem cell self-renewal, hematopoiesis, T cell homeostasis, trophoblast differentiation, and proper embryogenesis in mammals."},"narrative":{"teleology":[{"year":1999,"claim":"Establishing that BPTF (FAC1) DNA-binding activity is post-translationally regulated answered whether BPTF function is constitutive or dynamically controlled, revealing phosphorylation as a regulatory input.","evidence":"EMSA with phosphatase treatment and pharmacological phosphatase inhibition in nuclear extracts","pmids":["10403843"],"confidence":"Medium","gaps":["kinase(s) responsible not identified","in vivo relevance of phosphorylation-dependent binding not tested","phosphorylation sites on BPTF not mapped"]},{"year":2000,"claim":"Identification of BPTF interaction with the zinc-finger protein ZF87/MAZ and demonstration that BPTF represses MAZ-driven transcription established that BPTF can modulate transcription factor activity through direct protein-protein contact.","evidence":"Yeast two-hybrid, recombinant protein interaction, deletion mapping, and co-transfection reporter assay","pmids":["10727212"],"confidence":"Medium","gaps":["no in vivo confirmation of BPTF-MAZ functional interaction","relevance to endogenous gene targets not shown"]},{"year":2001,"claim":"Reconstitution of the NURF complex showed that BPTF together with ISWI is necessary and sufficient for nucleosome sliding, defining BPTF as the essential scaffolding subunit that also mediates transcription factor recruitment.","evidence":"Reconstitution from recombinant Drosophila proteins with in vitro nucleosome sliding and transcription factor interaction assays","pmids":["11583616"],"confidence":"High","gaps":["mammalian BPTF-ISWI sufficiency for sliding not directly reconstituted at this point","mechanism by which the HMGA-like domain facilitates sliding not structurally resolved"]},{"year":2006,"claim":"Structural determination of the BPTF PHD finger bound to H3K4me3 established the molecular basis for how NURF reads this activating histone mark, revealing the specificity pocket architecture and key residues.","evidence":"X-ray crystallography and NMR of the PHD finger free and H3K4me3-bound, with mutagenesis validation","pmids":["16728978"],"confidence":"High","gaps":["how PHD finger engagement translates to remodeling activity not addressed","contribution of bromodomain in multivalent binding not yet characterized"]},{"year":2006,"claim":"Genetic studies in C. elegans showed that a BPTF ortholog (NURF-1) functions in a NURF-like complex to antagonize repressive chromatin complexes during cell-fate specification, establishing an evolutionarily conserved role in developmental gene regulation.","evidence":"Genetic suppressor screen and epistasis analysis in C. elegans vulval development","pmids":["16774993"],"confidence":"Medium","gaps":["biochemical confirmation of a C. elegans NURF complex not provided","direct chromatin targets not identified"]},{"year":2008,"claim":"Knockout studies in mouse established that BPTF is essential for mammalian embryogenesis, specifically for trophoblast differentiation, visceral endoderm specification, and gastrulation, and that it physically interacts with Smad2/3 to co-regulate TGF-β target genes.","evidence":"Bptf-null mouse embryos with histological and molecular characterization; co-immunoprecipitation with Smad factors","pmids":["18974875","18794365"],"confidence":"High","gaps":["direct genomic targets of BPTF-Smad co-regulation in embryo not mapped","whether NURF remodeling activity per se is required for these phenotypes not tested"]},{"year":2009,"claim":"Characterization of alternatively spliced Drosophila NURF301 isoforms showed that the PHD finger and bromodomain are dispensable for some NURF functions but required for spermatogenesis, demonstrating that distinct BPTF isoforms confer different chromatin-reading capabilities.","evidence":"Isoform analysis, histone mark binding assays, and genetic mutant phenotyping in Drosophila","pmids":["19629165"],"confidence":"High","gaps":["mammalian BPTF isoform-specific functions not yet delineated","whether truncated isoforms have distinct genomic targets not determined"]},{"year":2015,"claim":"Discovery that BPTF physically interacts with c-MYC and is required for MYC-driven transcription, proliferation, and in vivo tumorigenesis established BPTF as a critical MYC cofactor linking chromatin remodeling to oncogenic programs.","evidence":"Co-IP, ChIP-seq, Bptf-null MEFs, and Bptf-deleted pancreatic tumor mouse model","pmids":["26729287"],"confidence":"High","gaps":["structural basis of the BPTF-MYC interaction unknown","whether BPTF is required for all MYC target genes or a specific subset not fully resolved"]},{"year":2015,"claim":"Demonstration that BPTF cooperates with phospho-Smad2 to open chromatin and activate wnt8a in zebrafish neural posteriorization provided in vivo evidence for BPTF as a signal-responsive chromatin remodeling effector.","evidence":"Morpholino knockdown, Co-IP, ChIP showing nucleosome density changes at wnt8a promoter in zebrafish","pmids":["26041917"],"confidence":"High","gaps":["genome-wide targets of BPTF-Smad2 in neural development not mapped"]},{"year":2016,"claim":"Conditional knockout studies revealed cell-intrinsic roles of BPTF in T cell homeostasis and Treg function, and showed that BPTF suppresses tumor immunogenicity by repressing immunoproteasome and antigen transporter genes, linking chromatin remodeling to immune evasion.","evidence":"T cell- and Treg-specific Bptf conditional KO mice; shRNA KD with gene expression analysis and PSMB8 inhibitor rescue","pmids":["27799308","27651309"],"confidence":"Medium","gaps":["whether BPTF directly binds immunoproteasome gene promoters or acts indirectly not fully resolved","mechanism connecting NURF remodeling to Foxp3 regulation unknown"]},{"year":2017,"claim":"ATAC-seq studies demonstrated that BPTF maintains open chromatin specifically at enhancer regions in mammary epithelial cells and is required for mammary stem cell self-renewal, providing genome-wide evidence for its role in stem cell chromatin accessibility.","evidence":"shRNA KD and chemical inhibition with ATAC-seq and mammary repopulation assays","pmids":["28579392"],"confidence":"High","gaps":["whether BPTF acts at enhancers via NURF-dependent sliding or additional mechanisms not distinguished"]},{"year":2018,"claim":"NMR and MD studies revealed that H3 tail–DNA contacts within nucleosomes inhibit BPTF PHD finger binding, and that post-translational modifications relieve this autoinhibition, resolving why histone peptide binding affinities overestimate nucleosomal recognition.","evidence":"NMR spectroscopy and MD simulations comparing BPTF PHD binding to free peptides versus reconstituted nucleosomes","pmids":["29648537"],"confidence":"High","gaps":["which specific modifications most effectively relieve autoinhibition on native chromatin not systematically tested","in vivo validation of this regulatory mechanism lacking"]},{"year":2018,"claim":"Hematopoietic-specific BPTF deletion showed it is essential for HSC maintenance and long-term reconstitution, with loss of chromatin accessibility at stemness genes, establishing BPTF as a master regulator of adult stem cell identity.","evidence":"Conditional KO mice with bone marrow reconstitution, RNA-seq, and ATAC-seq","pmids":["29456179"],"confidence":"High","gaps":["whether BPTF maintains HSC identity through NURF-dependent remodeling or additional transcription factor interactions not dissected"]},{"year":2018,"claim":"Biophysical characterization showed the BPTF bromodomain recognizes diacetylated H2A.Z, expanding the reader repertoire beyond canonical H3/H4 marks to histone variants.","evidence":"PrOF NMR, CPMG NMR, photo-crosslinking, and fluorescence anisotropy with acetylated H2A.Z peptides","pmids":["28771339"],"confidence":"Medium","gaps":["weak affinity (Kd ~780 µM) raises question of physiological relevance","nucleosome-context validation of H2A.Z recognition not performed in this study"]},{"year":2020,"claim":"Genetic epistasis in the Eµ-Myc lymphoma model confirmed BPTF haploinsufficiency delays MYC-driven lymphomagenesis and showed compensatory NF-κB pathway activation, establishing BPTF as a dose-dependent MYC effector in vivo.","evidence":"Eµ-Myc transgenic mice with conditional Bptf deletion, gene expression profiling","pmids":["32451433"],"confidence":"Medium","gaps":["whether NF-κB activation is a direct consequence of BPTF loss or secondary not resolved"]},{"year":2020,"claim":"hnRNPLL was found to control alternative splicing of Bptf during ES cell differentiation, showing that BPTF isoform switching is a regulated event important for pluripotency exit.","evidence":"Functional RBP screen, hnRNPLL KO mice, RNA-seq and splicing analysis","pmids":["33349972"],"confidence":"Medium","gaps":["functional differences between ES cell-preferred and differentiation-preferred BPTF isoforms not biochemically characterized"]},{"year":2024,"claim":"Integrated genomic and biochemical analysis in prostate cancer demonstrated that BPTF interacts with AR through its bromodomain and forms a ternary complex with FOXA1, using NURF remodeling to increase chromatin accessibility at AR binding sites — resolving how BPTF couples to hormone-dependent transcription.","evidence":"Co-IP, ChIP-seq, ATAC-seq, RNA-seq, and bromodomain inhibitor treatment in prostate cancer cells","pmids":["41381516"],"confidence":"High","gaps":["whether the BPTF-AR interaction is acetylation-dependent on AR itself not determined","structural basis of the ternary BPTF-AR-FOXA1 complex unknown"]},{"year":2025,"claim":"Identification that BPTF PHD-finger reading of H3K4me3 on tumor cells suppresses NK cell recognition, and that PROTAC-mediated BPTF degradation restores NCR ligand surface expression to enhance anti-tumor immunity, validated BPTF as a druggable immune-evasion target.","evidence":"PROTAC degrader, NK cytotoxicity assays, flow cytometry, and in vivo xenograft models","pmids":["39935175"],"confidence":"Medium","gaps":["mechanism linking BPTF-H3K4me3 reading to NCR ligand gene repression not fully elucidated","PROTAC selectivity and off-target effects not comprehensively assessed"]},{"year":2025,"claim":"Planarian stem cell studies and nucleosome mass spectrometry established that BPTF preferentially maintains accessibility at Set1-dependent (broad H3K4me3) promoters and requires coincident H3K4me3 with K9ac, K14ac, and K18ac for effective nucleosome engagement, defining the combinatorial histone code read by the tandem PHD-bromodomain cassette.","evidence":"RNAi + ATAC-seq in planarians; nucleosome mass spectrometry with defined modification states (preprint for Nuc-MS)","pmids":["40069606","bio_10.1101_2025.05.01.651740"],"confidence":"Medium","gaps":["Nuc-MS data is preprint and awaits peer review","whether broad versus narrow H3K4me3 distinction applies in mammalian BPTF function not tested"]},{"year":null,"claim":"The structural basis for how BPTF scaffolds the NURF complex and how its multivalent histone reading is allosterically coupled to ISWI ATPase activation remains unresolved at atomic resolution.","evidence":"","pmids":[],"confidence":"Low","gaps":["no cryo-EM or crystal structure of mammalian NURF holo-complex","mechanism coupling histone modification readout to ATPase stimulation unknown","systematic identification of BPTF isoform-specific interactomes and genomic targets in mammalian tissues not performed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0,2,3,9,25,31,35]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[6,7,8,14,16,19,20,24]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[18,19]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,6,24]}],"localization":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[0,3,6,7,8,14,24,34]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,6,18]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1,2,3,8,14,20,24,34]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,7,16,19,24]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,5,7,37]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[11,12,13,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,7,16,24]}],"complexes":["NURF"],"partners":["SMARCA1","MYC","MYCN","SMAD2","AR","FOXA1","NFKB1","PHF6"],"other_free_text":[]},"mechanistic_narrative":"BPTF is the scaffolding subunit of the NURF ATP-dependent chromatin remodeling complex, where it couples histone modification readout to nucleosome sliding and transcriptional activation at promoters and enhancers. Its C-terminal PHD finger recognizes H3K4me3 — with binding modulated by H3 tail–DNA contacts on nucleosomes — while its bromodomain engages acetylated histones including H4K16ac and diacetylated H2A.Z, enabling multivalent recruitment of the ISWI/SMARCA1 ATPase to appropriately marked chromatin [PMID:16728978, PMID:29648537, PMID:28771339, PMID:11583616]. BPTF physically interacts with and facilitates chromatin occupancy of sequence-specific transcription factors including c-MYC, MYCN, Smad2, AR/FOXA1, and NF-κB p50, thereby integrating signal-dependent transcription factor activity with chromatin remodeling at target loci [PMID:26729287, PMID:26041917, PMID:41381516, PMID:31934287]. Through maintenance of chromatin accessibility, BPTF is essential for hematopoietic stem cell self-renewal, mammary stem cell differentiation, T cell homeostasis, and proper mammalian embryogenesis — including trophoblast and visceral endoderm specification — and its loss suppresses MYC-driven tumorigenesis and enhances tumor immunogenicity by upregulating antigen processing and natural cytotoxicity receptor ligands [PMID:29456179, PMID:28579392, PMID:27799308, PMID:18974875, PMID:26729287, PMID:27651309, PMID:39935175]."},"prefetch_data":{"uniprot":{"accession":"Q12830","full_name":"Nucleosome-remodeling factor subunit BPTF","aliases":["Bromodomain and PHD finger-containing transcription factor","Fetal Alz-50 clone 1 protein","Fetal Alzheimer antigen"],"length_aa":3046,"mass_kda":338.3,"function":"Regulatory subunit of the ATP-dependent NURF-1 and NURF-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:14609955, PubMed:28801535). The NURF-1 ISWI chromatin remodeling complex has a lower ATP hydrolysis rate than the NURF-5 ISWI chromatin remodeling complex (PubMed:28801535). Within the NURF-1 ISWI chromatin-remodeling complex, binds to the promoters of En1 and En2 to positively regulate their expression and promote brain development (PubMed:14609955). Histone-binding protein which binds to H3 tails trimethylated on 'Lys-4' (H3K4me3), which mark transcription start sites of active genes (PubMed:16728976, PubMed:16728978). Binds to histone H3 tails dimethylated on 'Lys-4' (H3K4Me2) to a lesser extent (PubMed:16728976, PubMed:16728978, PubMed:18042461). May also regulate transcription through direct binding to DNA or transcription factors (PubMed:10575013)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q12830/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/BPTF","classification":"Common Essential","n_dependent_lines":853,"n_total_lines":1208,"dependency_fraction":0.7061258278145696},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"SMARCA1","stoichiometry":4.0},{"gene":"SMARCA5","stoichiometry":4.0},{"gene":"H2AFZ","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"PARP1","stoichiometry":0.2},{"gene":"RBBP4","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/BPTF","total_profiled":1310},"omim":[{"mim_id":"617755","title":"NEURODEVELOPMENTAL DISORDER WITH DYSMORPHIC FACIES AND DISTAL LIMB ANOMALIES; NEDDFL","url":"https://www.omim.org/entry/617755"},{"mim_id":"617215","title":"BPTF-ASSOCIATED CHROMATIN COMPLEX COMPONENT 1; BACC1","url":"https://www.omim.org/entry/617215"},{"mim_id":"602810","title":"HISTONE GENE CLUSTER 1, H3 HISTONE FAMILY, MEMBER A; HIST1H3A","url":"https://www.omim.org/entry/602810"},{"mim_id":"601819","title":"BROMODOMAIN PHD FINGER TRANSCRIPTION FACTOR; BPTF","url":"https://www.omim.org/entry/601819"},{"mim_id":"300012","title":"SWI/SNF-RELATED, MATRIX-ASSOCIATED, ACTIN-DEPENDENT REGULATOR OF CHROMATIN, SUBFAMILY A, MEMBER 1; SMARCA1","url":"https://www.omim.org/entry/300012"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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Crystal and NMR structures of the bromodomain-proximal PHD finger in free and H3K4me3-bound states were determined, and key specificity-determining residues were identified by point mutagenesis.\",\n      \"method\": \"X-ray crystallography, NMR spectroscopy, peptide binding assays, PHD finger point mutagenesis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure + NMR + mutagenesis in a single rigorous study\",\n      \"pmids\": [\"16728978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"BPTF (NURF301), the largest subunit of the NURF complex, together with the ISWI ATPase is necessary and sufficient for accurate and efficient nucleosome sliding in vitro. An HMGA/HMGI(Y)-like domain of NURF301 facilitates nucleosome sliding, implicating DNA conformational changes in the sliding mechanism. NURF301 also directly interacts with sequence-specific transcription factors, providing a basis for targeted recruitment of the NURF complex to specific genes.\",\n      \"method\": \"Reconstitution of full and partial NURF complexes from recombinant proteins, in vitro nucleosome sliding assay, interaction studies with transcription factors\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro with defined subunit requirements and multiple functional assays\",\n      \"pmids\": [\"11583616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Drosophila, alternative splicing of NURF301/BPTF generates distinct NURF complexes with differing histone modification binding specificities. Full-length NURF301 contains a C-terminal bromodomain and PHD finger that bind H3K4me3 and H4K16Ac respectively; a truncated isoform lacking these domains assembles a complex deficient in these marks. Full-length NURF301 (but not the truncated isoform) is required for spermatogenesis and expression of spermatid differentiation genes.\",\n      \"method\": \"Isoform characterization, microarray expression profiling, genetic mutant analysis, chromatin reader binding assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including binding assays, genetics, and expression profiling in vivo\",\n      \"pmids\": [\"19629165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The conformation of histone H3 tails within nucleosomes is inhibitory to BPTF PHD finger binding. The H3 tails interact robustly but dynamically with nucleosomal DNA, substantially reducing PHD finger association compared to free peptide. Altering the electrostatics of the H3 tail via post-translational modification or mutation increases accessibility to the PHD finger, indicating that PTM crosstalk regulates effector domain binding by altering nucleosome conformation.\",\n      \"method\": \"NMR spectroscopy, molecular dynamics (MD) simulations, binding assays with nucleosomes vs. peptides\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR + MD simulations with orthogonal functional validation in nucleosome context\",\n      \"pmids\": [\"29648537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Bptf is required in mouse embryos for establishment of a functional distal visceral endoderm and proper gastrulation. Bptf-null embryos implant but fail to establish anterior visceral endoderm and primitive streak. Bptf physically and functionally interacts with Smad transcription factors (Smad2/3) and may co-regulate gene targets of the TGF-β/Smad pathway essential for early mouse development.\",\n      \"method\": \"Knockout mouse analysis, lineage marker histology, microarray, embryoid body differentiation assays, co-immunoprecipitation (physical link to Smad factors)\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with defined phenotype + physical interaction + transcriptomic profiling\",\n      \"pmids\": [\"18974875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"BPTF/FAC1 is essential for trophoblast differentiation during early mouse development; its loss causes failure of ectoplacental cone development and embryonic lethality by E6.5. Development of the anterior visceral endoderm and primitive streak is also impaired in BPTF-null embryos.\",\n      \"method\": \"Loss-of-function mouse allele, histological analysis with lineage markers\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knockout mouse with defined embryonic phenotype and multiple lineage markers\",\n      \"pmids\": [\"18794365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BPTF physically interacts with c-MYC and is required for the full c-MYC transcriptional program in fibroblasts. BPTF knockdown leads to decreased c-MYC recruitment to DNA and changes in chromatin accessibility. In Bptf-null MEFs, BPTF is necessary for c-MYC-driven proliferation, G1-S progression, and replication stress but not c-MYC-driven apoptosis. In vivo, Bptf inactivation in pre-neoplastic pancreatic acinar cells significantly delays tumor development.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq (chromatin accessibility), genetic KO MEFs, in vivo mouse tumor model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ChIP-seq, genetic KO with defined phenotypic readouts and in vivo validation\",\n      \"pmids\": [\"26729287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In zebrafish, Bptf physically and functionally interacts with phospho-Smad2 (activated by non-Nodal TGF-β signaling) to promote expression of wnt8a, a critical gene for neural posteriorization. Bptf and Smad2 directly bind to and activate the wnt8a promoter by recruiting the NURF remodeling complex, and loss of Bptf increases nucleosome density on the wnt8a promoter.\",\n      \"method\": \"Morpholino knockdown in zebrafish, co-immunoprecipitation, ChIP (nucleosome density and factor binding at wnt8a promoter), reporter assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — physical interaction + ChIP + functional epistasis in vivo\",\n      \"pmids\": [\"26041917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BPTF maintains chromatin accessibility at enhancer regions in mammary epithelial cells (MECs) and is essential for mammary gland stem cell (MaSC) self-renewal and differentiation. BPTF depletion arrests cells at an undefined stage of epithelial differentiation with incapacity to achieve luminal cell fate, associated with loss of open chromatin at enhancers.\",\n      \"method\": \"shRNA-mediated KD, ATAC-seq (genome-wide DNA accessibility), BPTF chemical inhibition, mammary repopulation assays\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KD/KO with genome-wide chromatin accessibility (ATAC-seq) and functional stem cell assays\",\n      \"pmids\": [\"28579392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The BPTF bromodomain directly interacts with histone variant H2A.Z in a diacetylation-dependent manner (highest affinity for K4ac/K11ac diacetylation, Kd ~780 µM). This interaction was confirmed by protein-observed 19F NMR (PrOF NMR), 1H NMR CPMG experiments, and photo-cross-linking, and shows specificity over a panel of other bromodomains.\",\n      \"method\": \"PrOF NMR, CPMG NMR relaxation, photo-cross-linking, fluorescence anisotropy, peptide binding assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal biophysical methods, single lab; weak affinity interaction\",\n      \"pmids\": [\"28771339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MITF directly transcriptionally activates BPTF expression by binding to the BPTF promoter in melanoma cells, as shown by ChIP and luciferase reporter assays. BPTF transduces MITF-driven pro-survival signals including activation of BCL2, and BPTF overexpression rescues growth suppression caused by MITF silencing.\",\n      \"method\": \"ChIP, luciferase reporter assay, shRNA knockdown, cDNA rescue experiments\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + reporter assay + epistasis rescue, single lab\",\n      \"pmids\": [\"27185926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BPTF is required for T cell homeostasis via a cell-intrinsic mechanism, and Treg cell-specific BPTF deletion leads to reduced Foxp3 expression, increased lymphocyte infiltration in non-lymphoid organs, and systemic autoimmune syndrome in mice.\",\n      \"method\": \"Conditional T cell-specific and Treg-specific Bptf knockout mice, flow cytometry, histology\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with defined cellular and immune phenotypes\",\n      \"pmids\": [\"27799308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NURF (via BPTF) directly regulates expression of immunoproteasome subunit genes Psmb8 and Psmb9 and antigen transporter genes Tap1 and Tap2. BPTF silencing enhances tumor antigenicity through improved antigen processing, and PSMB8 inhibitor ONX-0914 reverses the effects of BPTF ablation.\",\n      \"method\": \"shRNA knockdown, gene expression analysis, PSMB8 inhibitor rescue experiments, co-culture cytotoxicity assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined molecular target genes and pharmacological rescue\",\n      \"pmids\": [\"27651309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BPTF occupies heparanase (Hpse) regulatory elements and activates its expression, leading to increased heparanase activity, reduced cell surface abundance of heparan sulfate proteoglycans (HSPGs) and natural cytotoxicity receptor (NCR) co-ligands, thereby suppressing NK cell cytolytic activity against tumor cells.\",\n      \"method\": \"ChIP (BPTF at heparanase promoter), gain/loss-of-function experiments, in vivo NCR1 blocking, NK cell cytotoxicity assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating direct occupancy + functional rescue with orthogonal approaches\",\n      \"pmids\": [\"28969075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BPTF is required for maintaining the population of hematopoietic stem/progenitor cells (HSPCs) and long-term HSCs. Bptf-deficient HSCs are defective in reconstituted hematopoiesis. BPTF loss downregulates HSC-specific gene programs including master transcription factors Meis1, Pbx1, Mn1, and Lmo2, and reduces chromatin accessibility at key HSC 'stemness' genes.\",\n      \"method\": \"Conditional knockout mice (hematopoietic-specific), bone marrow reconstitution assays, RNA-seq, ATAC-seq\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple orthogonal assays (RNA-seq, ATAC-seq, functional reconstitution)\",\n      \"pmids\": [\"29456179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The lncRNA NMR directly binds to BPTF and recruits BPTF to chromatin to potentially promote expression of MMP3 and MMP10 via the ERK1/2 pathway in esophageal squamous cell carcinoma cells.\",\n      \"method\": \"RNA pulldown, Co-IP, ChIP\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — RNA pulldown + ChIP showing recruitment, single lab\",\n      \"pmids\": [\"29763634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BPTF cooperates with the p50 subunit of NF-κB to regulate COX-2 promoter activity and expression in lung cancer cells. BPTF is identified as a COX-2 promoter-binding protein by biotin-streptavidin-agarose pulldown and ChIP; BPTF knockdown abrogates p50 binding to the COX-2 promoter, and p50 inhibition reverses the effect of BPTF silencing on COX-2 expression.\",\n      \"method\": \"Biotin-streptavidin-agarose pulldown, mass spectrometry, ChIP, co-immunoprecipitation, luciferase reporter assay\",\n      \"journal\": \"American journal of translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods (pulldown, ChIP, Co-IP, reporter), single lab\",\n      \"pmids\": [\"31934287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"FAC1 (BPTF) interacts with the Myc-associated zinc finger protein ZF87/MAZ, as demonstrated by yeast two-hybrid and confirmed with recombinant protein in vitro. The ZF87/MAZ interaction domain was mapped to the region containing a putative NLS/NES of FAC1. FAC1 represses ZF87/MAZ-induced transcriptional activation of the SV40 promoter in a dose-dependent manner, and a FAC1 deletion mutant lacking the ZF87/MAZ interaction domain does not suppress ZF87/MAZ activation.\",\n      \"method\": \"Yeast two-hybrid, in vitro recombinant protein interaction, deletion mutant mapping, co-transfection luciferase reporter assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid + in vitro confirmation + functional reporter assay with domain mapping\",\n      \"pmids\": [\"10727212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"FAC1 (BPTF) DNA binding activity is dramatically enhanced by phosphorylation; phosphatase treatment of nuclear extracts reduces FAC1 DNA binding affinity, and inhibition of serine/threonine phosphatases increases FAC1 DNA binding activity, indicating that FAC1 DNA binding is regulated by phosphorylation.\",\n      \"method\": \"DNA binding assays (EMSA), phosphatase treatment of nuclear extracts, pharmacological phosphatase inhibition\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical assays with pharmacological and enzymatic manipulation, single lab\",\n      \"pmids\": [\"10403843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BPTF directly binds to the Cdc25A promoter (-178/+107 region) and transcriptionally activates Cdc25A expression, accelerating the cell cycle in colorectal cancer cells. BPTF itself is transcriptionally regulated by c-Myc, forming a c-Myc/BPTF/Cdc25A signaling axis.\",\n      \"method\": \"RNA-seq, DNA-pulldown, ChIP, luciferase reporter assay, siRNA/shRNA knockdown\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (ChIP, DNA-pulldown, reporter assay), single lab\",\n      \"pmids\": [\"35932692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL14-mediated m6A modification negatively regulates the mRNA stability of BPTF. METTL14 deficiency leads to accumulation of BPTF, which remodels the enhancer landscape and constitutes super-enhancers activating downstream oncogenic targets such as ENO2 and SRC, leading to glycolytic reprogramming in renal cell carcinoma.\",\n      \"method\": \"MeRIP-seq, RNA-seq, ChIP-seq, ATAC-seq, cell line and organoid models, xenograft models\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple genomic approaches (MeRIP-seq, ChIP-seq, ATAC-seq) establishing mechanistic link, single lab\",\n      \"pmids\": [\"33664855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"hnRNPLL controls alternative splicing of Bptf during embryonic stem cell differentiation, promoting ES cell-preferred exon skipping events. hnRNPLL-mediated alternative splicing of Bptf (and Tbx3) is important for pluripotency exit; depletion of hnRNPLL leads to sustained expression of ES cell-preferred Bptf isoforms and differentiation deficiency.\",\n      \"method\": \"Functional RBP screen, hnRNPLL knockout mice, RNA-seq, splicing analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mice + transcriptomic profiling establishing isoform-specific function, single lab\",\n      \"pmids\": [\"33349972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BPTF's impact on high-grade glioma growth is mediated through positive effects on expression of MYC and MYC pathway targets, as shown by shRNA screens in vitro/in vivo. BPTF depletion reduces tumor self-renewal capacity and leads to more neuronal characteristics.\",\n      \"method\": \"In vitro/in vivo epigenomic shRNA inhibition screen, gene expression analysis, neurosphere self-renewal assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo shRNA screen with functional and transcriptomic readouts, single lab\",\n      \"pmids\": [\"31844250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BPTF interacts with MYCN and core regulatory circuitry (CRC) transcription factors in neuroblastoma, as shown by immunoprecipitation/mass spectrometry. Genome-wide BPTF distribution shows dual roles: co-localization with MYCN/MYC at cell cycle gene promoters, and co-localization with CRC transcription factors at super-enhancers to regulate cell identity.\",\n      \"method\": \"Immunoprecipitation/mass spectrometry, bulk RNA-seq, single-cell sequencing, ChIP-seq, tissue microarrays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — IP/MS with genome-wide ChIP-seq, multiple approaches; preprint\",\n      \"pmids\": [\"38405949\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BPTF regulates androgen receptor (AR) activity in prostate cancer by increasing chromatin accessibility at AR binding sites (through SMARCA1, the catalytic NURF subunit) and by forming a protein complex with AR and FOXA1 in which FOXA1 recruits the BPTF-AR complex to chromatin while BPTF stabilizes the AR-FOXA1 interaction. BPTF interacts with AR through its bromodomain, and bromodomain inhibition disrupts this interaction and impairs AR signaling.\",\n      \"method\": \"RNA-seq, ChIP-seq, ATAC-seq, Co-IP, bromodomain inhibitor treatment, BPTF knockdown\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genomic and biochemical orthogonal methods (ChIP-seq, ATAC-seq, Co-IP, inhibitor validation), single lab but rigorous\",\n      \"pmids\": [\"41381516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BPTF's PHD finger interprets H3K4me3 on HCC cells to hinder their recognition by NK cells. PROTAC-mediated degradation of BPTF directly enhances the abundance of natural cytotoxicity receptor ligands on HCC cells, facilitating recognition and cytotoxicity by NK cells both in vitro and in vivo.\",\n      \"method\": \"PROTAC degrader, NK cell cytotoxicity assays, flow cytometry for NCR ligand expression, in vivo xenograft models\",\n      \"journal\": \"Molecular therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — PROTAC degradation with functional immune assays and in vivo validation, single lab\",\n      \"pmids\": [\"39935175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BPTF is required for normal B-cell differentiation and c-MYC-driven B-cell lymphomagenesis. Haploinsufficiency of Bptf delays lymphomagenesis in Eμ-Myc mice. Tumors arising in a Bptf heterozygous background display decreased c-MYC levels and pathway activity, and increased NF-κB pathway activation.\",\n      \"method\": \"Eμ-Myc transgenic mouse model with conditional Bptf deletion, gene expression analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic epistasis in mouse lymphoma model with molecular pathway analysis\",\n      \"pmids\": [\"32451433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHF6 physically interacts with BPTF and recruits it to mediate epigenetic remodeling to augment HIF transcriptional activity in breast cancer cells. PHF6 also physically interacts with HIF-1α and HIF-2α to potentiate HIF-driven transcriptional events.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-qPCR, CRISPR HIF double knockout\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP with ChIP validation, single lab\",\n      \"pmids\": [\"36967443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BPTF promotes COX-2 expression by facilitating VEGF promoter occupancy; lumbrokinase downregulates BPTF expression, decreases its anchoring at the VEGF promoter region, and thereby suppresses VEGF expression in NSCLC cells.\",\n      \"method\": \"ChIP (BPTF at VEGF promoter), Western blot, siRNA knockdown\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — ChIP in a pharmacological context, single lab, indirect readout\",\n      \"pmids\": [\"39062456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NUP98-BPTF fusion protein promotes transformation of NIH3T3 fibroblasts by transcriptionally upregulating Pim1 through binding to its promoter, and activates MYC and mTORC1 signaling. PIM1 knockdown or pharmacological mTORC1 inhibition suppresses NUP98-BPTF-induced transformation. NUP98-BPTF also enhances survival of Jurkat T-ALL cells by inactivating the pro-apoptotic protein BAD.\",\n      \"method\": \"Lentiviral inducible expression in NIH3T3 and Jurkat cells, ChIP (binding to Pim1 promoter), shRNA/inhibitor rescue experiments\",\n      \"journal\": \"Cancer medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP showing direct promoter binding + functional rescue, single lab\",\n      \"pmids\": [\"38940430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Molecular dynamics simulations reveal that BPTF PHD finger and bromodomain adopt distinct conformational states depending on binding context; nucleosome engagement induces compaction of the multidomain structure. PHD finger binding displaces the H3 tail from nucleosomal DNA, increasing H3 tail flexibility and promoting compensatory binding of the H4 tail to DNA, weakening overall hydrogen bonding with DNA and suggesting localized nucleosome destabilization.\",\n      \"method\": \"Molecular dynamics (MD) simulations\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational only, no direct experimental validation in this study\",\n      \"pmids\": [\"40616262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Using nucleosome mass spectrometry, the BPTF PHD-bromodomain native tandem reader was shown to require coincident H3K4me3 together with K9ac, K14ac, and K18ac for effective nucleosome engagement, demonstrating multivalent combinatorial histone modification readout.\",\n      \"method\": \"Nucleosome mass spectrometry (Nuc-MS), native top-down MS\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — novel mass spectrometry method with direct protein-nucleosome readout; preprint\",\n      \"pmids\": [\"bio_10.1101_2025.05.01.651740\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BPTF activates hTERT expression transcriptionally in hepatocellular carcinoma cells, as shown by knockdown experiments demonstrating that BPTF loss reduces hTERT expression and inhibits stem cell traits and tumor growth.\",\n      \"method\": \"shRNA knockdown, Western blot, xenograft mouse model\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — KD with phenotype but mechanistic link (direct promoter binding) not established by ChIP\",\n      \"pmids\": [\"30419422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BPTF regulates FOXC1 protein stability in glioma via USP34-mediated de-ubiquitination; BPTF knockdown reduces FOXC1 protein levels and inhibits glioma cell proliferation, apoptosis, and migration. The interaction between BPTF and USP34, and the effect on FOXC1 ubiquitination, was demonstrated by immunoprecipitation assays.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Western blot, shRNA knockdown, functional cell assays\",\n      \"journal\": \"Histology and histopathology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus functional assay, single lab, no structural or reconstitution data\",\n      \"pmids\": [\"38686761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BPTF primarily affects chromatin accessibility at gene promoters near transcription start sites in planarian stem cells; BPTF-dependent loss of accessibility and gene expression is greatest at genes marked by Set1-dependent H3K4me3 (with broader peaks) but not MLL1/2-dependent H3K4me3. Loss of bptf phenocopies Set1 knockdown.\",\n      \"method\": \"RNAi knockdown in planarians, ATAC-seq, RNA-seq, genetic epistasis with Set1\",\n      \"journal\": \"BMC genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ATAC-seq + RNA-seq + genetic epistasis in vivo organism, single lab\",\n      \"pmids\": [\"40069606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BPTF bromodomain directly interacts with acetylated H2A.Z isoforms in an affinity-dependent and acetyl-lysine binding pocket-specific manner, as validated by photoaffinity probes with diazirine photo-crosslinking in both recombinant BPTF and in nuclear lysates from A549 lung cancer cells. Endogenous BPTF was enriched by acetylated H2A.Z probes, though to a lesser extent than the canonical H4K16ac partner.\",\n      \"method\": \"Photoaffinity crosslinking probes, SDS-PAGE, pulldown from nuclear lysates, bottom-up proteomics for histone acetylation quantification\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — photoaffinity crosslinking in both recombinant and cell lysate contexts with pocket-specific controls\",\n      \"pmids\": [\"40864556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BPTF binds directly to the promoter region of the Slug gene and activates Slug transcription, thereby promoting trophoblast epithelial-to-mesenchymal transition (EMT). BPTF knockdown prevents EMT and attenuates trophoblast invasion in vitro.\",\n      \"method\": \"shRNA knockdown, ChIP (BPTF at Slug promoter), invasion assays\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — ChIP + KD functional assay, single lab\",\n      \"pmids\": [\"38521110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In C. elegans, ISW-1 (ISWI ortholog) acts as part of a NURF-like complex with NURF-1 (NURF301/BPTF ortholog) to promote vulval cell-fate specification by antagonizing the transcriptional activities of Myb-MuvB/dREAM, NuRD, and Tip60/NuA4 complexes. Mutations in isw-1 and nurf-1 suppress both the synMuv phenotype and the multivulva phenotype caused by Ras pathway overactivation.\",\n      \"method\": \"Genetic suppressor screen, double-mutant epistasis analysis in C. elegans\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple alleles and pathways, ortholog functional study\",\n      \"pmids\": [\"16774993\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BPTF is the largest subunit and NURF-specific scaffolding component of the ATP-dependent NURF chromatin remodeling complex (with ISWI/SMARCA1 as the catalytic ATPase), where it reads histone H3K4me3 via its PHD finger (recognition inhibited by H3 tail-DNA contacts in the nucleosome context) and acetylated histones via its bromodomain, thereby recruiting NURF to specific chromatin loci to promote nucleosome sliding and increase chromatin accessibility at target gene promoters and enhancers; BPTF physically interacts with and facilitates the chromatin occupancy and transcriptional activity of oncogenic transcription factors including c-MYC, MYCN, AR, Smad2, and NF-κB p50, and is required for stem cell self-renewal, hematopoiesis, T cell homeostasis, trophoblast differentiation, and proper embryogenesis in mammals.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"BPTF is the scaffolding subunit of the NURF ATP-dependent chromatin remodeling complex, where it couples histone modification readout to nucleosome sliding and transcriptional activation at promoters and enhancers. Its C-terminal PHD finger recognizes H3K4me3 — with binding modulated by H3 tail–DNA contacts on nucleosomes — while its bromodomain engages acetylated histones including H4K16ac and diacetylated H2A.Z, enabling multivalent recruitment of the ISWI/SMARCA1 ATPase to appropriately marked chromatin [PMID:16728978, PMID:29648537, PMID:28771339, PMID:11583616]. BPTF physically interacts with and facilitates chromatin occupancy of sequence-specific transcription factors including c-MYC, MYCN, Smad2, AR/FOXA1, and NF-κB p50, thereby integrating signal-dependent transcription factor activity with chromatin remodeling at target loci [PMID:26729287, PMID:26041917, PMID:41381516, PMID:31934287]. Through maintenance of chromatin accessibility, BPTF is essential for hematopoietic stem cell self-renewal, mammary stem cell differentiation, T cell homeostasis, and proper mammalian embryogenesis — including trophoblast and visceral endoderm specification — and its loss suppresses MYC-driven tumorigenesis and enhances tumor immunogenicity by upregulating antigen processing and natural cytotoxicity receptor ligands [PMID:29456179, PMID:28579392, PMID:27799308, PMID:18974875, PMID:26729287, PMID:27651309, PMID:39935175].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing that BPTF (FAC1) DNA-binding activity is post-translationally regulated answered whether BPTF function is constitutive or dynamically controlled, revealing phosphorylation as a regulatory input.\",\n      \"evidence\": \"EMSA with phosphatase treatment and pharmacological phosphatase inhibition in nuclear extracts\",\n      \"pmids\": [\"10403843\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"kinase(s) responsible not identified\", \"in vivo relevance of phosphorylation-dependent binding not tested\", \"phosphorylation sites on BPTF not mapped\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of BPTF interaction with the zinc-finger protein ZF87/MAZ and demonstration that BPTF represses MAZ-driven transcription established that BPTF can modulate transcription factor activity through direct protein-protein contact.\",\n      \"evidence\": \"Yeast two-hybrid, recombinant protein interaction, deletion mapping, and co-transfection reporter assay\",\n      \"pmids\": [\"10727212\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"no in vivo confirmation of BPTF-MAZ functional interaction\", \"relevance to endogenous gene targets not shown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Reconstitution of the NURF complex showed that BPTF together with ISWI is necessary and sufficient for nucleosome sliding, defining BPTF as the essential scaffolding subunit that also mediates transcription factor recruitment.\",\n      \"evidence\": \"Reconstitution from recombinant Drosophila proteins with in vitro nucleosome sliding and transcription factor interaction assays\",\n      \"pmids\": [\"11583616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mammalian BPTF-ISWI sufficiency for sliding not directly reconstituted at this point\", \"mechanism by which the HMGA-like domain facilitates sliding not structurally resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Structural determination of the BPTF PHD finger bound to H3K4me3 established the molecular basis for how NURF reads this activating histone mark, revealing the specificity pocket architecture and key residues.\",\n      \"evidence\": \"X-ray crystallography and NMR of the PHD finger free and H3K4me3-bound, with mutagenesis validation\",\n      \"pmids\": [\"16728978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"how PHD finger engagement translates to remodeling activity not addressed\", \"contribution of bromodomain in multivalent binding not yet characterized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Genetic studies in C. elegans showed that a BPTF ortholog (NURF-1) functions in a NURF-like complex to antagonize repressive chromatin complexes during cell-fate specification, establishing an evolutionarily conserved role in developmental gene regulation.\",\n      \"evidence\": \"Genetic suppressor screen and epistasis analysis in C. elegans vulval development\",\n      \"pmids\": [\"16774993\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"biochemical confirmation of a C. elegans NURF complex not provided\", \"direct chromatin targets not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Knockout studies in mouse established that BPTF is essential for mammalian embryogenesis, specifically for trophoblast differentiation, visceral endoderm specification, and gastrulation, and that it physically interacts with Smad2/3 to co-regulate TGF-β target genes.\",\n      \"evidence\": \"Bptf-null mouse embryos with histological and molecular characterization; co-immunoprecipitation with Smad factors\",\n      \"pmids\": [\"18974875\", \"18794365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"direct genomic targets of BPTF-Smad co-regulation in embryo not mapped\", \"whether NURF remodeling activity per se is required for these phenotypes not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Characterization of alternatively spliced Drosophila NURF301 isoforms showed that the PHD finger and bromodomain are dispensable for some NURF functions but required for spermatogenesis, demonstrating that distinct BPTF isoforms confer different chromatin-reading capabilities.\",\n      \"evidence\": \"Isoform analysis, histone mark binding assays, and genetic mutant phenotyping in Drosophila\",\n      \"pmids\": [\"19629165\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mammalian BPTF isoform-specific functions not yet delineated\", \"whether truncated isoforms have distinct genomic targets not determined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Discovery that BPTF physically interacts with c-MYC and is required for MYC-driven transcription, proliferation, and in vivo tumorigenesis established BPTF as a critical MYC cofactor linking chromatin remodeling to oncogenic programs.\",\n      \"evidence\": \"Co-IP, ChIP-seq, Bptf-null MEFs, and Bptf-deleted pancreatic tumor mouse model\",\n      \"pmids\": [\"26729287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"structural basis of the BPTF-MYC interaction unknown\", \"whether BPTF is required for all MYC target genes or a specific subset not fully resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstration that BPTF cooperates with phospho-Smad2 to open chromatin and activate wnt8a in zebrafish neural posteriorization provided in vivo evidence for BPTF as a signal-responsive chromatin remodeling effector.\",\n      \"evidence\": \"Morpholino knockdown, Co-IP, ChIP showing nucleosome density changes at wnt8a promoter in zebrafish\",\n      \"pmids\": [\"26041917\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"genome-wide targets of BPTF-Smad2 in neural development not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Conditional knockout studies revealed cell-intrinsic roles of BPTF in T cell homeostasis and Treg function, and showed that BPTF suppresses tumor immunogenicity by repressing immunoproteasome and antigen transporter genes, linking chromatin remodeling to immune evasion.\",\n      \"evidence\": \"T cell- and Treg-specific Bptf conditional KO mice; shRNA KD with gene expression analysis and PSMB8 inhibitor rescue\",\n      \"pmids\": [\"27799308\", \"27651309\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"whether BPTF directly binds immunoproteasome gene promoters or acts indirectly not fully resolved\", \"mechanism connecting NURF remodeling to Foxp3 regulation unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"ATAC-seq studies demonstrated that BPTF maintains open chromatin specifically at enhancer regions in mammary epithelial cells and is required for mammary stem cell self-renewal, providing genome-wide evidence for its role in stem cell chromatin accessibility.\",\n      \"evidence\": \"shRNA KD and chemical inhibition with ATAC-seq and mammary repopulation assays\",\n      \"pmids\": [\"28579392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether BPTF acts at enhancers via NURF-dependent sliding or additional mechanisms not distinguished\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"NMR and MD studies revealed that H3 tail–DNA contacts within nucleosomes inhibit BPTF PHD finger binding, and that post-translational modifications relieve this autoinhibition, resolving why histone peptide binding affinities overestimate nucleosomal recognition.\",\n      \"evidence\": \"NMR spectroscopy and MD simulations comparing BPTF PHD binding to free peptides versus reconstituted nucleosomes\",\n      \"pmids\": [\"29648537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"which specific modifications most effectively relieve autoinhibition on native chromatin not systematically tested\", \"in vivo validation of this regulatory mechanism lacking\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Hematopoietic-specific BPTF deletion showed it is essential for HSC maintenance and long-term reconstitution, with loss of chromatin accessibility at stemness genes, establishing BPTF as a master regulator of adult stem cell identity.\",\n      \"evidence\": \"Conditional KO mice with bone marrow reconstitution, RNA-seq, and ATAC-seq\",\n      \"pmids\": [\"29456179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether BPTF maintains HSC identity through NURF-dependent remodeling or additional transcription factor interactions not dissected\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Biophysical characterization showed the BPTF bromodomain recognizes diacetylated H2A.Z, expanding the reader repertoire beyond canonical H3/H4 marks to histone variants.\",\n      \"evidence\": \"PrOF NMR, CPMG NMR, photo-crosslinking, and fluorescence anisotropy with acetylated H2A.Z peptides\",\n      \"pmids\": [\"28771339\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"weak affinity (Kd ~780 µM) raises question of physiological relevance\", \"nucleosome-context validation of H2A.Z recognition not performed in this study\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genetic epistasis in the Eµ-Myc lymphoma model confirmed BPTF haploinsufficiency delays MYC-driven lymphomagenesis and showed compensatory NF-κB pathway activation, establishing BPTF as a dose-dependent MYC effector in vivo.\",\n      \"evidence\": \"Eµ-Myc transgenic mice with conditional Bptf deletion, gene expression profiling\",\n      \"pmids\": [\"32451433\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"whether NF-κB activation is a direct consequence of BPTF loss or secondary not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"hnRNPLL was found to control alternative splicing of Bptf during ES cell differentiation, showing that BPTF isoform switching is a regulated event important for pluripotency exit.\",\n      \"evidence\": \"Functional RBP screen, hnRNPLL KO mice, RNA-seq and splicing analysis\",\n      \"pmids\": [\"33349972\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"functional differences between ES cell-preferred and differentiation-preferred BPTF isoforms not biochemically characterized\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Integrated genomic and biochemical analysis in prostate cancer demonstrated that BPTF interacts with AR through its bromodomain and forms a ternary complex with FOXA1, using NURF remodeling to increase chromatin accessibility at AR binding sites — resolving how BPTF couples to hormone-dependent transcription.\",\n      \"evidence\": \"Co-IP, ChIP-seq, ATAC-seq, RNA-seq, and bromodomain inhibitor treatment in prostate cancer cells\",\n      \"pmids\": [\"41381516\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether the BPTF-AR interaction is acetylation-dependent on AR itself not determined\", \"structural basis of the ternary BPTF-AR-FOXA1 complex unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification that BPTF PHD-finger reading of H3K4me3 on tumor cells suppresses NK cell recognition, and that PROTAC-mediated BPTF degradation restores NCR ligand surface expression to enhance anti-tumor immunity, validated BPTF as a druggable immune-evasion target.\",\n      \"evidence\": \"PROTAC degrader, NK cytotoxicity assays, flow cytometry, and in vivo xenograft models\",\n      \"pmids\": [\"39935175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mechanism linking BPTF-H3K4me3 reading to NCR ligand gene repression not fully elucidated\", \"PROTAC selectivity and off-target effects not comprehensively assessed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Planarian stem cell studies and nucleosome mass spectrometry established that BPTF preferentially maintains accessibility at Set1-dependent (broad H3K4me3) promoters and requires coincident H3K4me3 with K9ac, K14ac, and K18ac for effective nucleosome engagement, defining the combinatorial histone code read by the tandem PHD-bromodomain cassette.\",\n      \"evidence\": \"RNAi + ATAC-seq in planarians; nucleosome mass spectrometry with defined modification states (preprint for Nuc-MS)\",\n      \"pmids\": [\"40069606\", \"bio_10.1101_2025.05.01.651740\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuc-MS data is preprint and awaits peer review\", \"whether broad versus narrow H3K4me3 distinction applies in mammalian BPTF function not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for how BPTF scaffolds the NURF complex and how its multivalent histone reading is allosterically coupled to ISWI ATPase activation remains unresolved at atomic resolution.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"no cryo-EM or crystal structure of mammalian NURF holo-complex\", \"mechanism coupling histone modification readout to ATPase stimulation unknown\", \"systematic identification of BPTF isoform-specific interactomes and genomic targets in mammalian tissues not performed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 2, 3, 9, 25, 31, 35]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [6, 7, 8, 14, 16, 19, 20, 24]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [18, 19]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 6, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 3, 6, 7, 8, 14, 24, 34]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 6, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1, 2, 3, 8, 14, 20, 24, 34]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 7, 16, 19, 24]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 5, 7, 37]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [11, 12, 13, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 7, 16, 24]}\n    ],\n    \"complexes\": [\n      \"NURF\"\n    ],\n    \"partners\": [\n      \"SMARCA1\",\n      \"MYC\",\n      \"MYCN\",\n      \"SMAD2\",\n      \"AR\",\n      \"FOXA1\",\n      \"NFKB1\",\n      \"PHF6\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}