{"gene":"SET","run_date":"2026-06-10T07:46:31","timeline":{"discoveries":[{"year":2007,"finding":"Crystal structure of SET/TAF-Iβ/INHAT resolved at 2.3 Å revealed a dimeric 'headphone'-like structure with N-terminus, backbone helix, and 'earmuff' domain per subunit. Biochemical mutagenesis showed the bottom surface of the earmuff domain mediates histone chaperone activity by binding both core histones and double-stranded DNA.","method":"X-ray crystallography at 2.3 Å resolution; biochemical mutagenesis; in vitro binding assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and in vitro binding validation in a single rigorous study","pmids":["17360516"],"is_preprint":false},{"year":2002,"finding":"SET/PHAPII (phosphoprotein SET) inhibits protein phosphatase 2A (PP2A) but not PP4, thereby increasing 17,20 lyase activity of P450c17 and promoting androgen biosynthesis. PP2A co-immunoprecipitated with P450c17; SET inhibited PP2A in a concentration-dependent, okadaic acid-sensitive manner.","method":"Co-immunoprecipitation; siRNA knockdown; microsomal activity assays; phosphatase inhibitor experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, siRNA knockdown, in vitro phosphatase assay with multiple orthogonal methods","pmids":["12444089"],"is_preprint":false},{"year":1994,"finding":"PHAPII (SET) was purified from the cytosolic fraction of human B-cells using a synthetic biotinylated cytoplasmic region of the HLA-DR2 alpha chain as affinity matrix, indicating SET binds the cytoplasmic region of HLA class II molecules.","method":"Affinity chromatography purification; protein sequencing; cDNA sequencing","journal":"Biological chemistry Hoppe-Seyler","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct affinity purification with sequence confirmation, single lab","pmids":["8192856"],"is_preprint":false},{"year":2003,"finding":"TAF-Iβ (SET) forms ternary complexes with adenovirus DNA-protein VII complexes in infected cells during early infection. In vitro binding assays showed TAF-I interacts with DNA through core protein VII.","method":"In vitro binding assays with recombinant proteins; co-immunoprecipitation from infected cells","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro reconstitution plus cell-based Co-IP, single lab","pmids":["14675767"],"is_preprint":false},{"year":2015,"finding":"Cytochrome c translocates to cell nuclei upon DNA damage and competitively inhibits SET/TAF-Iβ histone chaperone activity by binding its histone-binding domains and locking them, thereby preventing nucleosome assembly. The structural basis of the cytochrome c–SET/TAF-Iβ interaction was characterized by NMR spectroscopy, calorimetry, mutagenesis, and molecular docking.","method":"NMR spectroscopy; isothermal titration calorimetry; site-directed mutagenesis; molecular docking; nucleosome assembly assay; subcellular fractionation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure, calorimetry, mutagenesis, and functional nucleosome assembly assay combined in one rigorous study","pmids":["26216969"],"is_preprint":false},{"year":2011,"finding":"SET/TAF-Iβ inhibited p300- and PCAF-mediated acetylation of p53 in an INHAT domain-dependent manner. SET/TAF-Iβ interacted with p53, repressed transcription of p53 target genes, and blocked p53-mediated cell cycle arrest and apoptosis. In Drosophila, dSet inhibited dp53 acetylation and rescued apoptotic eye phenotype induced by dp53 overexpression or UV irradiation.","method":"In vitro acetylation assay; Co-immunoprecipitation; reporter assays; FACS; TUNEL; BrdU incorporation; Drosophila genetic rescue experiments","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (in vitro assay, Co-IP, cell-based functional readouts, in vivo genetic rescue), replicated across mammalian and Drosophila systems","pmids":["21911363"],"is_preprint":false},{"year":2013,"finding":"SET/TAF-Iβ interacts with Ku70/80 heterodimer and inhibits CBP- and PCAF-mediated Ku70 acetylation in an INHAT domain-dependent manner. UV-induced DNA damage disrupted the SET/TAF-Iβ–Ku70 interaction, releasing Ku70/80 for recruitment to DNA double-strand break sites via the NHEJ pathway.","method":"Co-immunoprecipitation; in vitro acetylation assay; laser micro-irradiation/live imaging of Ku70 recruitment; siRNA knockdown","journal":"Cellular and molecular life sciences : CMLS","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vitro assay, live-cell DNA damage recruitment imaging with functional consequence, multiple orthogonal methods","pmids":["24305947"],"is_preprint":false},{"year":2007,"finding":"Activated glucocorticoid receptor (GR) interacts with the DNA-binding domain of SET/TAF-Iβ via yeast two-hybrid and co-precipitates with glucocorticoid response elements (GREs) of glucocorticoid-responsive promoters. Ligand-bound GR causes dissociation of SET/TAF-Iβ from promoter GREs, relieving transcriptional repression. The SET-CAN fusion protein does not interact with GR and is constitutively associated with GREs, suppressing GR-mediated transcription.","method":"Yeast two-hybrid; chromatin immunoprecipitation (ChIP); reporter gene assays; Co-immunoprecipitation","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, yeast two-hybrid, reporter assays in single lab with multiple complementary methods","pmids":["18096310"],"is_preprint":false},{"year":2005,"finding":"PCOTH overexpression in prostate cancer cells significantly elevated phosphorylation of SET/TAF-Iβ, as demonstrated by 2D-DIGE, Western blotting, and in-gel kinase assay, linking PCOTH to SET-mediated cancer cell growth.","method":"2D-DIGE phosphoproteomic analysis; Western blotting; in-gel kinase assay; siRNA knockdown","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal phosphoproteomic methods, single lab","pmids":["15930275"],"is_preprint":false},{"year":2011,"finding":"SET nuclear oncogene directly binds the N-terminal BRCT domain of MCPH1 (Microcephalin). SET knockdown caused abnormal chromosome condensation similar to MCPH1-deficient cells, rescued by Condensin II knockdown. MCPH1 missense mutations impairing SET binding failed to rescue the abnormal chromosome condensation phenotype.","method":"Co-immunoprecipitation; siRNA knockdown; epistasis rescue experiments with condensin II knockdown; mutant cell complementation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic epistasis with condensin II, mutant rescue experiments, multiple orthogonal approaches","pmids":["21515671"],"is_preprint":false},{"year":2009,"finding":"SET/TAF-Iβ binds histone H3 preferentially over H2B (Kd 0.15 μM vs 2.87 μM). The central region of SET/TAF-Iβ mediates binding to the globular domain of H3, while the acidic C-terminal tail and N-terminal dimerization domain are dispensable for this interaction.","method":"GST pulldown; fluorescence spectroscopy-based binding assays; circular dichroism of truncation mutants","journal":"BMC biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative binding assays combined with domain mapping by mutagenesis/truncation, single lab","pmids":["19358706"],"is_preprint":false},{"year":2005,"finding":"SET/TAF-Iβ directly interacts with the acetyltransferase CBP (CREB-binding protein) and enhances CBP-mediated transactivation. SET localizes in distinct nucleoplasmic foci in interphase cells.","method":"Co-immunoprecipitation; confocal laser scanning microscopy; reporter gene transactivation assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP, localization imaging, and functional reporter assay; single lab","pmids":["16061203"],"is_preprint":false},{"year":2017,"finding":"SET/TAF-Iβ and PP32 associate with newly synthesized histone H4 and prevent HAT1-mediated acetylation of H4 at K5 and K12 in vitro. Depletion of PP32 and SET/TAF-Iβ in vivo caused hyperacetylation of H4, decreased H4 stability, reduced Hsp90 interaction, and S-phase arrest.","method":"Proteomics/MS of newly synthesized H4 complex; in vitro HAT1 acetylation assay; siRNA knockdown; mass spectrometry; cell cycle analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro enzymatic assay, proteomic identification, and in vivo knockdown with multiple phenotypic readouts in a single study","pmids":["28977641"],"is_preprint":false},{"year":2014,"finding":"SET/TAF-Iβ inhibits p300-mediated acetylation of FoxO1 in an INHAT domain-dependent manner. SET/TAF-Iβ interacts with FoxO1 and activates transcription of the FoxO1 target gene p21, with increased p21 transcription also observed under oxidative stress conditions.","method":"In vitro acetylation assay; Co-immunoprecipitation; luciferase reporter assay; RT-PCR","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro assay plus cell-based Co-IP and reporter assays, single lab","pmids":["24983498"],"is_preprint":false},{"year":2006,"finding":"SET binds the carboxyl region of the M3-muscarinic receptor third intracellular loop (i3 loop). Endogenous SET co-immunoprecipitates with intact M3 muscarinic receptor. siRNA knockdown of SET augmented M3 receptor-mediated intracellular calcium mobilization by ~35% without affecting P2-purinergic receptor or ionomycin-stimulated calcium responses, indicating SET specifically attenuates M3 muscarinic receptor signaling capacity.","method":"GST pulldown from rat brain lysates; Co-immunoprecipitation; siRNA knockdown; calcium mobilization assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — GST pulldown, reciprocal Co-IP, siRNA knockdown with specific functional readout and appropriate controls showing specificity","pmids":["17065150"],"is_preprint":false},{"year":2007,"finding":"Proteomic screen identified SET-binding proteins including CK2, eIF2α, glycogen phosphorylase (GP), and TCP1-β. SET is a substrate of CK2 in vitro. SET interacts with active (phosphorylated) glycogen phosphorylase but not its inactive form.","method":"SET affinity chromatography; 2-DE/MALDI-TOF MS; Western blot confirmation; Co-immunoprecipitation; in vitro kinase assay","journal":"Proteomics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — affinity MS screen with Co-IP confirmation and in vitro kinase assay, single lab","pmids":["17309103"],"is_preprint":false},{"year":2005,"finding":"SET/I2PP2A negatively regulates the MEK/ERK pathway: overexpression suppressed EGF-stimulated ERK activation, while siRNA-mediated depletion enhanced MEK and ERK activations. SET overexpression inhibited G1/S transition and suppressed cell proliferation.","method":"siRNA knockdown; exogenous overexpression; Western blotting for ERK/MEK phosphorylation; flow cytometry cell cycle analysis","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain- and loss-of-function with pathway readouts, single lab","pmids":["15703833"],"is_preprint":false},{"year":2010,"finding":"SET/TAF-Iβ binds promoters of neuronal development marker genes and negatively regulates their transcription. SET/TAF-Iβ is abundantly expressed in neuronal tissues of Drosophila embryos prior to and in early neuronal development and is reduced during differentiation; siRNA knockdown of SET/TAF-Iβ induces neuronal cell differentiation.","method":"Chromatin immunoprecipitation (ChIP); siRNA knockdown; gene expression analysis; immunostaining of Drosophila embryos","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct promoter binding plus functional siRNA knockdown with differentiation readout, single lab","pmids":["20800572"],"is_preprint":false},{"year":2017,"finding":"SET protein accumulation promotes active DNA demethylation (via increased TET1 levels and 5-hydroxymethylcytosine formation), and directly binds chromatin at promoters of target genes to decrease histone acetylation and repress transcription. TSA (HDAC inhibitor) treatment reversed SET-mediated transcriptional repression and reduced SET protein levels and chromatin binding.","method":"DNA methylation array; 5-methylcytidine/5-hydroxymethylcytosine immunostaining; ChIP; gene expression panels; pharmacological inhibition with 5-AZA and TSA","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct chromatin binding, epigenetic profiling, and functional rescue with inhibitors, single lab","pmids":["28460463"],"is_preprint":false},{"year":2008,"finding":"SET-CAN fusion protein (from t(9;9) acute undifferentiated leukemia) impairs hematopoietic differentiation of erythroid, megakaryocytic, and B cell lineages in transgenic mice, with accumulation of c-kit+Sca-1+Lin- cells in bone marrow. Transgenic mice expressing SET-CAN under the Gata1 regulatory domain developed anemia, thrombocytopenia, and splenomegaly.","method":"Transgenic mouse model; flow cytometry; bone marrow analysis; hematopoietic cell characterization","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic model with defined cellular phenotype, single lab","pmids":["17620317"],"is_preprint":false}],"current_model":"SET (also known as TAF-Iβ, PHAPII, I2PP2A) is a multifunctional nuclear protein that acts as a histone chaperone (binding core histones via its central earmuff domain), as an INHAT (inhibitor of histone acetyltransferases) complex subunit that shields histones and non-histone substrates (p53, Ku70, FoxO1) from acetylation, as an endogenous inhibitor of protein phosphatase 2A (PP2A) to regulate signaling pathways including MEK/ERK and androgen biosynthesis, as a regulator of chromosome condensation through direct interaction with MCPH1's BRCT domain, and as a modulator of GPCR (M3 muscarinic receptor) signaling; its histone chaperone activity is inhibited by cytochrome c upon DNA damage, and its activity is regulated by phosphorylation (e.g., by CK2)."},"narrative":{"mechanistic_narrative":"SET (TAF-Iβ / PHAPII / I2PP2A) is a multifunctional nuclear protein that couples histone chaperone activity to the control of protein acetylation, phosphatase signaling, and chromatin-dependent transcription [PMID:17360516, PMID:21911363]. Structurally it is a dimeric 'headphone'-shaped protein whose central 'earmuff' domain binds both core histones and double-stranded DNA to mediate its chaperone function [PMID:17360516]; quantitatively it binds histone H3 with high affinity through this central region, while the acidic C-terminal tail and N-terminal dimerization domain are dispensable [PMID:19358706]. As a histone chaperone SET associates with newly synthesized H4 and shields it from HAT1-mediated K5/K12 acetylation, maintaining H4 stability and orderly S-phase progression [PMID:28977641]. Beyond histones, its INHAT activity blocks acetylation of multiple non-histone substrates—p53 by p300/PCAF, Ku70 by CBP/PCAF, and FoxO1 by p300—thereby repressing p53-dependent cell-cycle arrest and apoptosis, gating Ku70/80 release for NHEJ repair after DNA damage, and modulating FoxO1-driven p21 transcription [PMID:21911363, PMID:24305947, PMID:24983498]. SET also acts as an endogenous PP2A inhibitor, increasing P450c17 17,20-lyase activity to promote androgen biosynthesis and negatively regulating the MEK/ERK pathway and G1/S transition [PMID:12444089, PMID:15703833]. Through direct binding to the BRCT domain of MCPH1 it restrains condensin II to ensure normal chromosome condensation [PMID:21515671], and it represses chromatin targets via reduced histone acetylation coupled to TET1-driven DNA demethylation [PMID:28460463]. Its histone chaperone activity is switched off when cytochrome c translocates to the nucleus upon DNA damage and locks its histone-binding domains [PMID:26216969]. SET additionally attenuates M3-muscarinic receptor signaling by binding the receptor i3 loop [PMID:17065150], and its leukemogenic SET-CAN fusion impairs hematopoietic differentiation [PMID:17620317].","teleology":[{"year":1994,"claim":"Established an early biochemical handle on SET/PHAPII by isolating it through a defined ligand, framing it as a cytosolic interactor of HLA class II cytoplasmic tails.","evidence":"Affinity purification on a biotinylated HLA-DR2 alpha cytoplasmic peptide with protein and cDNA sequencing","pmids":["8192856"],"confidence":"Medium","gaps":["No functional consequence of HLA binding shown","Single-lab affinity capture without orthogonal validation"]},{"year":2002,"claim":"Showed that SET acts as a selective PP2A inhibitor with a concrete physiological output, linking phosphatase control to steroidogenesis.","evidence":"Co-IP, siRNA knockdown, and okadaic-acid-sensitive microsomal phosphatase/lyase activity assays","pmids":["12444089"],"confidence":"High","gaps":["Does not define how SET selectivity for PP2A over PP4 is achieved","Structural basis of inhibition unresolved"]},{"year":2003,"claim":"Demonstrated that SET/TAF-I can be hijacked into viral nucleoprotein assembly, showing its chaperone surface engages DNA via partner proteins.","evidence":"In vitro binding with recombinant proteins and Co-IP from adenovirus-infected cells","pmids":["14675767"],"confidence":"Medium","gaps":["Relevance to endogenous chromatin assembly not established","Single-lab context"]},{"year":2005,"claim":"Connected SET to oncogenic signaling, defining it as a negative regulator of the MEK/ERK proliferative axis and a brake on G1/S transition.","evidence":"Reciprocal overexpression/siRNA with ERK/MEK phosphorylation Western blots and flow cytometry","pmids":["15703833"],"confidence":"Medium","gaps":["Mechanistic link between PP2A inhibition and ERK suppression not directly dissected","Single-lab study"]},{"year":2005,"claim":"Identified an activating role in transcription via direct CBP binding, broadening SET beyond acetyltransferase inhibition and placing it in nucleoplasmic foci.","evidence":"Co-IP, confocal microscopy, and reporter transactivation assays","pmids":["16061203"],"confidence":"Medium","gaps":["Apparent contradiction with INHAT inhibitory role unresolved","Promoter context-dependence not mapped"]},{"year":2005,"claim":"Placed SET phosphorylation downstream of an oncoprotein, suggesting its activity is regulated by upstream kinase signaling in cancer.","evidence":"2D-DIGE phosphoproteomics, in-gel kinase assay, and siRNA in prostate cancer cells","pmids":["15930275"],"confidence":"Medium","gaps":["Phosphorylation site and functional consequence on SET not defined","Direct vs indirect kinase relationship unclear"]},{"year":2006,"claim":"Extended SET function to membrane receptor signaling, showing it directly dampens M3 muscarinic receptor output.","evidence":"GST pulldown, reciprocal Co-IP, and siRNA with specific calcium mobilization readouts and controls","pmids":["17065150"],"confidence":"High","gaps":["Molecular mechanism by which i3-loop binding attenuates signaling unknown","Whether nuclear SET pools contribute is unclear"]},{"year":2007,"claim":"Provided the structural foundation for SET function, defining the dimeric architecture and the earmuff surface that binds histones and DNA.","evidence":"2.3 Å X-ray crystallography with mutagenesis and in vitro binding","pmids":["17360516"],"confidence":"High","gaps":["No structure of histone- or substrate-bound complex","Does not explain non-histone substrate selectivity"]},{"year":2007,"claim":"Defined SET as a corepressor that occupies GREs and is displaced by ligand-bound GR, and showed the SET-CAN fusion locks repression—mechanistically linking SET to nuclear hormone signaling and oncogenesis.","evidence":"Yeast two-hybrid, ChIP, reporter assays, and Co-IP","pmids":["18096310"],"confidence":"Medium","gaps":["Generality across GR target genes not established","Single-lab study"]},{"year":2007,"claim":"Built an interaction map identifying CK2 as a kinase acting on SET and metabolic/translation-associated partners, framing SET as a phosphorylation-regulated hub.","evidence":"Affinity-MS screen with Co-IP confirmation and in vitro CK2 kinase assay","pmids":["17309103"],"confidence":"Medium","gaps":["Functional consequences of most interactions untested","CK2 phosphosite and its effect not mapped"]},{"year":2008,"claim":"Modeled the leukemogenic activity of the SET-CAN fusion in vivo, linking SET-derived oncoproteins to blocked hematopoietic differentiation.","evidence":"Gata1-driven SET-CAN transgenic mice with flow cytometry and bone marrow analysis","pmids":["17620317"],"confidence":"Medium","gaps":["Contribution of native SET domains to the phenotype not isolated","Molecular targets of the fusion in vivo unknown"]},{"year":2009,"claim":"Quantified SET's histone preference and mapped the binding determinant to its central region, refining the chaperone mechanism.","evidence":"GST pulldown, fluorescence binding (Kd determination), and CD on truncation mutants","pmids":["19358706"],"confidence":"Medium","gaps":["Affinity in the context of full nucleosome assembly not addressed","Single-lab measurements"]},{"year":2010,"claim":"Identified a developmental gene-regulatory role, showing SET binds neuronal marker promoters and restrains differentiation.","evidence":"ChIP, siRNA, expression analysis, and Drosophila embryo immunostaining","pmids":["20800572"],"confidence":"Medium","gaps":["Direct repressive mechanism at these promoters not dissected","Mammalian conservation of neuronal role untested here"]},{"year":2011,"claim":"Established SET as a direct INHAT regulator of p53, mechanistically connecting acetylation shielding to suppression of cell-cycle arrest and apoptosis across species.","evidence":"In vitro acetylation, Co-IP, reporter/FACS/TUNEL readouts, and Drosophila genetic rescue","pmids":["21911363"],"confidence":"High","gaps":["In vivo tumor-suppressor relevance not addressed","Selectivity among p53 lysines not defined"]},{"year":2011,"claim":"Revealed a chromosome-condensation function through direct MCPH1 BRCT-domain binding that restrains condensin II.","evidence":"Co-IP, siRNA, condensin II epistasis, and MCPH1 mutant complementation","pmids":["21515671"],"confidence":"High","gaps":["How SET-MCPH1 binding mechanistically limits condensin II unclear","Cell-cycle timing of the interaction not resolved"]},{"year":2013,"claim":"Defined SET as a switch controlling Ku70 acetylation and NHEJ engagement, with DNA damage releasing Ku70/80 to break sites.","evidence":"Reciprocal Co-IP, in vitro acetylation, and laser micro-irradiation live imaging with siRNA","pmids":["24305947"],"confidence":"High","gaps":["Signal that triggers SET-Ku70 dissociation not identified","Quantitative impact on repair efficiency not measured"]},{"year":2014,"claim":"Extended INHAT regulation to FoxO1, linking SET to oxidative-stress-responsive p21 transcription.","evidence":"In vitro acetylation, Co-IP, luciferase reporter, and RT-PCR","pmids":["24983498"],"confidence":"Medium","gaps":["Whether SET activates or represses FoxO1 targets broadly is unclear","Single-lab study"]},{"year":2015,"claim":"Identified the off-switch for SET chaperone activity: nuclear cytochrome c locks its histone-binding domains during DNA damage, blocking nucleosome assembly.","evidence":"NMR, ITC, mutagenesis, docking, nucleosome assembly assay, and subcellular fractionation","pmids":["26216969"],"confidence":"High","gaps":["Downstream chromatin/apoptotic consequences of this block not fully traced","Kinetics of cytochrome c competition in cells not measured"]},{"year":2017,"claim":"Demonstrated SET's role in safeguarding newly synthesized H4, preventing HAT1 over-acetylation and supporting H4 stability and S-phase progression.","evidence":"Proteomics of new-H4 complex, in vitro HAT1 assay, siRNA, and cell-cycle analysis","pmids":["28977641"],"confidence":"High","gaps":["Division of labor between SET and PP32 not resolved","Link to Hsp90 chaperone pathway mechanistically incomplete"]},{"year":2017,"claim":"Connected SET-driven transcriptional repression to coordinated epigenetic remodeling via TET1-dependent DNA demethylation and reduced histone acetylation.","evidence":"Methylation arrays, 5mC/5hmC staining, ChIP, expression panels, and 5-AZA/TSA inhibition","pmids":["28460463"],"confidence":"Medium","gaps":["Direct vs indirect control of TET1 not established","Single-lab study"]},{"year":null,"claim":"How SET's distinct activities—histone chaperone, INHAT acetylation shielding, PP2A inhibition, and receptor/transcription regulation—are partitioned and coordinated within a cell, and how phosphorylation toggles between them, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated model linking phosphorylation state to which activity dominates","Substrate-selection rules for INHAT shielding undefined","Spatial/temporal regulation across cytosolic and nuclear pools unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0,10,12]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,5,6,13,12]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,5,6,13,14,16]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,3]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[7,17,18]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[11]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,5,9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,12,18]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[6]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,7,13,17,18]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,14,16]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[9,12,16]}],"complexes":["INHAT complex"],"partners":["PP2A","TP53","XRCC6","FOXO1","MCPH1","CREBBP","CHRM3","CSNK2A1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q01105","full_name":"Protein SET","aliases":["HLA-DR-associated protein II","Inhibitor of granzyme A-activated DNase","IGAAD","PHAPII","Phosphatase 2A inhibitor I2PP2A","I-2PP2A","Template-activating factor I","TAF-I"],"length_aa":290,"mass_kda":33.5,"function":"Multitasking protein, involved in apoptosis, transcription, nucleosome assembly and histone chaperoning. Isoform 2 anti-apoptotic activity is mediated by inhibition of the GZMA-activated DNase, NME1. In the course of cytotoxic T-lymphocyte (CTL)-induced apoptosis, GZMA cleaves SET, disrupting its binding to NME1 and releasing NME1 inhibition. Isoform 1 and isoform 2 are potent inhibitors of protein phosphatase 2A. Isoform 1 and isoform 2 inhibit EP300/CREBBP and PCAF-mediated acetylation of histones (HAT) and nucleosomes, most probably by masking the accessibility of lysines of histones to the acetylases. The predominant target for inhibition is histone H4. HAT inhibition leads to silencing of HAT-dependent transcription and prevents active demethylation of DNA. 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Gene regulatory mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/32389825","citation_count":19,"is_preprint":false},{"pmid":"17065150","id":"PMC_17065150","title":"The proto-oncogene SET interacts with muscarinic receptors and attenuates receptor signaling.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17065150","citation_count":19,"is_preprint":false},{"pmid":"15703833","id":"PMC_15703833","title":"The oncoprotein I-2PP2A/SET negatively regulates the MEK/ERK pathway and cell proliferation.","date":"2005","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/15703833","citation_count":18,"is_preprint":false},{"pmid":"37032117","id":"PMC_37032117","title":"Modulating auxin response stabilizes tomato fruit set.","date":"2023","source":"Plant physiology","url":"https://pubmed.ncbi.nlm.nih.gov/37032117","citation_count":18,"is_preprint":false},{"pmid":"26062569","id":"PMC_26062569","title":"The therapeutic effects of SET/I2PP2A inhibitors on canine melanoma.","date":"2015","source":"The Journal of veterinary medical science","url":"https://pubmed.ncbi.nlm.nih.gov/26062569","citation_count":18,"is_preprint":false},{"pmid":"30443898","id":"PMC_30443898","title":"SET alpha and SET beta mRNA isoforms in chronic lymphocytic leukaemia.","date":"2018","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/30443898","citation_count":17,"is_preprint":false},{"pmid":"33028195","id":"PMC_33028195","title":"GeneSetCluster: a tool for summarizing and integrating gene-set analysis results.","date":"2020","source":"BMC bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/33028195","citation_count":17,"is_preprint":false},{"pmid":"20800572","id":"PMC_20800572","title":"Negative regulation of neuronal cell differentiation by INHAT subunit SET/TAF-Iβ.","date":"2010","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/20800572","citation_count":17,"is_preprint":false},{"pmid":"26093049","id":"PMC_26093049","title":"miSEA: microRNA set enrichment analysis.","date":"2015","source":"Bio Systems","url":"https://pubmed.ncbi.nlm.nih.gov/26093049","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":39890,"output_tokens":4876,"usd":0.096405,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13210,"output_tokens":5477,"usd":0.101487,"stage2_stop_reason":"end_turn"},"total_usd":0.197892,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of SET/TAF-Iβ/INHAT resolved at 2.3 Å revealed a dimeric 'headphone'-like structure with N-terminus, backbone helix, and 'earmuff' domain per subunit. Biochemical mutagenesis showed the bottom surface of the earmuff domain mediates histone chaperone activity by binding both core histones and double-stranded DNA.\",\n      \"method\": \"X-ray crystallography at 2.3 Å resolution; biochemical mutagenesis; in vitro binding assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and in vitro binding validation in a single rigorous study\",\n      \"pmids\": [\"17360516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"SET/PHAPII (phosphoprotein SET) inhibits protein phosphatase 2A (PP2A) but not PP4, thereby increasing 17,20 lyase activity of P450c17 and promoting androgen biosynthesis. PP2A co-immunoprecipitated with P450c17; SET inhibited PP2A in a concentration-dependent, okadaic acid-sensitive manner.\",\n      \"method\": \"Co-immunoprecipitation; siRNA knockdown; microsomal activity assays; phosphatase inhibitor experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, siRNA knockdown, in vitro phosphatase assay with multiple orthogonal methods\",\n      \"pmids\": [\"12444089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"PHAPII (SET) was purified from the cytosolic fraction of human B-cells using a synthetic biotinylated cytoplasmic region of the HLA-DR2 alpha chain as affinity matrix, indicating SET binds the cytoplasmic region of HLA class II molecules.\",\n      \"method\": \"Affinity chromatography purification; protein sequencing; cDNA sequencing\",\n      \"journal\": \"Biological chemistry Hoppe-Seyler\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct affinity purification with sequence confirmation, single lab\",\n      \"pmids\": [\"8192856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TAF-Iβ (SET) forms ternary complexes with adenovirus DNA-protein VII complexes in infected cells during early infection. In vitro binding assays showed TAF-I interacts with DNA through core protein VII.\",\n      \"method\": \"In vitro binding assays with recombinant proteins; co-immunoprecipitation from infected cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro reconstitution plus cell-based Co-IP, single lab\",\n      \"pmids\": [\"14675767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cytochrome c translocates to cell nuclei upon DNA damage and competitively inhibits SET/TAF-Iβ histone chaperone activity by binding its histone-binding domains and locking them, thereby preventing nucleosome assembly. The structural basis of the cytochrome c–SET/TAF-Iβ interaction was characterized by NMR spectroscopy, calorimetry, mutagenesis, and molecular docking.\",\n      \"method\": \"NMR spectroscopy; isothermal titration calorimetry; site-directed mutagenesis; molecular docking; nucleosome assembly assay; subcellular fractionation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure, calorimetry, mutagenesis, and functional nucleosome assembly assay combined in one rigorous study\",\n      \"pmids\": [\"26216969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SET/TAF-Iβ inhibited p300- and PCAF-mediated acetylation of p53 in an INHAT domain-dependent manner. SET/TAF-Iβ interacted with p53, repressed transcription of p53 target genes, and blocked p53-mediated cell cycle arrest and apoptosis. In Drosophila, dSet inhibited dp53 acetylation and rescued apoptotic eye phenotype induced by dp53 overexpression or UV irradiation.\",\n      \"method\": \"In vitro acetylation assay; Co-immunoprecipitation; reporter assays; FACS; TUNEL; BrdU incorporation; Drosophila genetic rescue experiments\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (in vitro assay, Co-IP, cell-based functional readouts, in vivo genetic rescue), replicated across mammalian and Drosophila systems\",\n      \"pmids\": [\"21911363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SET/TAF-Iβ interacts with Ku70/80 heterodimer and inhibits CBP- and PCAF-mediated Ku70 acetylation in an INHAT domain-dependent manner. UV-induced DNA damage disrupted the SET/TAF-Iβ–Ku70 interaction, releasing Ku70/80 for recruitment to DNA double-strand break sites via the NHEJ pathway.\",\n      \"method\": \"Co-immunoprecipitation; in vitro acetylation assay; laser micro-irradiation/live imaging of Ku70 recruitment; siRNA knockdown\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vitro assay, live-cell DNA damage recruitment imaging with functional consequence, multiple orthogonal methods\",\n      \"pmids\": [\"24305947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Activated glucocorticoid receptor (GR) interacts with the DNA-binding domain of SET/TAF-Iβ via yeast two-hybrid and co-precipitates with glucocorticoid response elements (GREs) of glucocorticoid-responsive promoters. Ligand-bound GR causes dissociation of SET/TAF-Iβ from promoter GREs, relieving transcriptional repression. The SET-CAN fusion protein does not interact with GR and is constitutively associated with GREs, suppressing GR-mediated transcription.\",\n      \"method\": \"Yeast two-hybrid; chromatin immunoprecipitation (ChIP); reporter gene assays; Co-immunoprecipitation\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, yeast two-hybrid, reporter assays in single lab with multiple complementary methods\",\n      \"pmids\": [\"18096310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PCOTH overexpression in prostate cancer cells significantly elevated phosphorylation of SET/TAF-Iβ, as demonstrated by 2D-DIGE, Western blotting, and in-gel kinase assay, linking PCOTH to SET-mediated cancer cell growth.\",\n      \"method\": \"2D-DIGE phosphoproteomic analysis; Western blotting; in-gel kinase assay; siRNA knockdown\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal phosphoproteomic methods, single lab\",\n      \"pmids\": [\"15930275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SET nuclear oncogene directly binds the N-terminal BRCT domain of MCPH1 (Microcephalin). SET knockdown caused abnormal chromosome condensation similar to MCPH1-deficient cells, rescued by Condensin II knockdown. MCPH1 missense mutations impairing SET binding failed to rescue the abnormal chromosome condensation phenotype.\",\n      \"method\": \"Co-immunoprecipitation; siRNA knockdown; epistasis rescue experiments with condensin II knockdown; mutant cell complementation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic epistasis with condensin II, mutant rescue experiments, multiple orthogonal approaches\",\n      \"pmids\": [\"21515671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SET/TAF-Iβ binds histone H3 preferentially over H2B (Kd 0.15 μM vs 2.87 μM). The central region of SET/TAF-Iβ mediates binding to the globular domain of H3, while the acidic C-terminal tail and N-terminal dimerization domain are dispensable for this interaction.\",\n      \"method\": \"GST pulldown; fluorescence spectroscopy-based binding assays; circular dichroism of truncation mutants\",\n      \"journal\": \"BMC biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative binding assays combined with domain mapping by mutagenesis/truncation, single lab\",\n      \"pmids\": [\"19358706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SET/TAF-Iβ directly interacts with the acetyltransferase CBP (CREB-binding protein) and enhances CBP-mediated transactivation. SET localizes in distinct nucleoplasmic foci in interphase cells.\",\n      \"method\": \"Co-immunoprecipitation; confocal laser scanning microscopy; reporter gene transactivation assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP, localization imaging, and functional reporter assay; single lab\",\n      \"pmids\": [\"16061203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SET/TAF-Iβ and PP32 associate with newly synthesized histone H4 and prevent HAT1-mediated acetylation of H4 at K5 and K12 in vitro. Depletion of PP32 and SET/TAF-Iβ in vivo caused hyperacetylation of H4, decreased H4 stability, reduced Hsp90 interaction, and S-phase arrest.\",\n      \"method\": \"Proteomics/MS of newly synthesized H4 complex; in vitro HAT1 acetylation assay; siRNA knockdown; mass spectrometry; cell cycle analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro enzymatic assay, proteomic identification, and in vivo knockdown with multiple phenotypic readouts in a single study\",\n      \"pmids\": [\"28977641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SET/TAF-Iβ inhibits p300-mediated acetylation of FoxO1 in an INHAT domain-dependent manner. SET/TAF-Iβ interacts with FoxO1 and activates transcription of the FoxO1 target gene p21, with increased p21 transcription also observed under oxidative stress conditions.\",\n      \"method\": \"In vitro acetylation assay; Co-immunoprecipitation; luciferase reporter assay; RT-PCR\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro assay plus cell-based Co-IP and reporter assays, single lab\",\n      \"pmids\": [\"24983498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SET binds the carboxyl region of the M3-muscarinic receptor third intracellular loop (i3 loop). Endogenous SET co-immunoprecipitates with intact M3 muscarinic receptor. siRNA knockdown of SET augmented M3 receptor-mediated intracellular calcium mobilization by ~35% without affecting P2-purinergic receptor or ionomycin-stimulated calcium responses, indicating SET specifically attenuates M3 muscarinic receptor signaling capacity.\",\n      \"method\": \"GST pulldown from rat brain lysates; Co-immunoprecipitation; siRNA knockdown; calcium mobilization assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — GST pulldown, reciprocal Co-IP, siRNA knockdown with specific functional readout and appropriate controls showing specificity\",\n      \"pmids\": [\"17065150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Proteomic screen identified SET-binding proteins including CK2, eIF2α, glycogen phosphorylase (GP), and TCP1-β. SET is a substrate of CK2 in vitro. SET interacts with active (phosphorylated) glycogen phosphorylase but not its inactive form.\",\n      \"method\": \"SET affinity chromatography; 2-DE/MALDI-TOF MS; Western blot confirmation; Co-immunoprecipitation; in vitro kinase assay\",\n      \"journal\": \"Proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — affinity MS screen with Co-IP confirmation and in vitro kinase assay, single lab\",\n      \"pmids\": [\"17309103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SET/I2PP2A negatively regulates the MEK/ERK pathway: overexpression suppressed EGF-stimulated ERK activation, while siRNA-mediated depletion enhanced MEK and ERK activations. SET overexpression inhibited G1/S transition and suppressed cell proliferation.\",\n      \"method\": \"siRNA knockdown; exogenous overexpression; Western blotting for ERK/MEK phosphorylation; flow cytometry cell cycle analysis\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain- and loss-of-function with pathway readouts, single lab\",\n      \"pmids\": [\"15703833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SET/TAF-Iβ binds promoters of neuronal development marker genes and negatively regulates their transcription. SET/TAF-Iβ is abundantly expressed in neuronal tissues of Drosophila embryos prior to and in early neuronal development and is reduced during differentiation; siRNA knockdown of SET/TAF-Iβ induces neuronal cell differentiation.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP); siRNA knockdown; gene expression analysis; immunostaining of Drosophila embryos\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct promoter binding plus functional siRNA knockdown with differentiation readout, single lab\",\n      \"pmids\": [\"20800572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SET protein accumulation promotes active DNA demethylation (via increased TET1 levels and 5-hydroxymethylcytosine formation), and directly binds chromatin at promoters of target genes to decrease histone acetylation and repress transcription. TSA (HDAC inhibitor) treatment reversed SET-mediated transcriptional repression and reduced SET protein levels and chromatin binding.\",\n      \"method\": \"DNA methylation array; 5-methylcytidine/5-hydroxymethylcytosine immunostaining; ChIP; gene expression panels; pharmacological inhibition with 5-AZA and TSA\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct chromatin binding, epigenetic profiling, and functional rescue with inhibitors, single lab\",\n      \"pmids\": [\"28460463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SET-CAN fusion protein (from t(9;9) acute undifferentiated leukemia) impairs hematopoietic differentiation of erythroid, megakaryocytic, and B cell lineages in transgenic mice, with accumulation of c-kit+Sca-1+Lin- cells in bone marrow. Transgenic mice expressing SET-CAN under the Gata1 regulatory domain developed anemia, thrombocytopenia, and splenomegaly.\",\n      \"method\": \"Transgenic mouse model; flow cytometry; bone marrow analysis; hematopoietic cell characterization\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic model with defined cellular phenotype, single lab\",\n      \"pmids\": [\"17620317\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SET (also known as TAF-Iβ, PHAPII, I2PP2A) is a multifunctional nuclear protein that acts as a histone chaperone (binding core histones via its central earmuff domain), as an INHAT (inhibitor of histone acetyltransferases) complex subunit that shields histones and non-histone substrates (p53, Ku70, FoxO1) from acetylation, as an endogenous inhibitor of protein phosphatase 2A (PP2A) to regulate signaling pathways including MEK/ERK and androgen biosynthesis, as a regulator of chromosome condensation through direct interaction with MCPH1's BRCT domain, and as a modulator of GPCR (M3 muscarinic receptor) signaling; its histone chaperone activity is inhibited by cytochrome c upon DNA damage, and its activity is regulated by phosphorylation (e.g., by CK2).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SET (TAF-Iβ / PHAPII / I2PP2A) is a multifunctional nuclear protein that couples histone chaperone activity to the control of protein acetylation, phosphatase signaling, and chromatin-dependent transcription [#0, #5]. Structurally it is a dimeric 'headphone'-shaped protein whose central 'earmuff' domain binds both core histones and double-stranded DNA to mediate its chaperone function [#0]; quantitatively it binds histone H3 with high affinity through this central region, while the acidic C-terminal tail and N-terminal dimerization domain are dispensable [#10]. As a histone chaperone SET associates with newly synthesized H4 and shields it from HAT1-mediated K5/K12 acetylation, maintaining H4 stability and orderly S-phase progression [#12]. Beyond histones, its INHAT activity blocks acetylation of multiple non-histone substrates—p53 by p300/PCAF, Ku70 by CBP/PCAF, and FoxO1 by p300—thereby repressing p53-dependent cell-cycle arrest and apoptosis, gating Ku70/80 release for NHEJ repair after DNA damage, and modulating FoxO1-driven p21 transcription [#5, #6, #13]. SET also acts as an endogenous PP2A inhibitor, increasing P450c17 17,20-lyase activity to promote androgen biosynthesis and negatively regulating the MEK/ERK pathway and G1/S transition [#1, #16]. Through direct binding to the BRCT domain of MCPH1 it restrains condensin II to ensure normal chromosome condensation [#9], and it represses chromatin targets via reduced histone acetylation coupled to TET1-driven DNA demethylation [#18]. Its histone chaperone activity is switched off when cytochrome c translocates to the nucleus upon DNA damage and locks its histone-binding domains [#4]. SET additionally attenuates M3-muscarinic receptor signaling by binding the receptor i3 loop [#14], and its leukemogenic SET-CAN fusion impairs hematopoietic differentiation [#19].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established an early biochemical handle on SET/PHAPII by isolating it through a defined ligand, framing it as a cytosolic interactor of HLA class II cytoplasmic tails.\",\n      \"evidence\": \"Affinity purification on a biotinylated HLA-DR2 alpha cytoplasmic peptide with protein and cDNA sequencing\",\n      \"pmids\": [\"8192856\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional consequence of HLA binding shown\", \"Single-lab affinity capture without orthogonal validation\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed that SET acts as a selective PP2A inhibitor with a concrete physiological output, linking phosphatase control to steroidogenesis.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, and okadaic-acid-sensitive microsomal phosphatase/lyase activity assays\",\n      \"pmids\": [\"12444089\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define how SET selectivity for PP2A over PP4 is achieved\", \"Structural basis of inhibition unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated that SET/TAF-I can be hijacked into viral nucleoprotein assembly, showing its chaperone surface engages DNA via partner proteins.\",\n      \"evidence\": \"In vitro binding with recombinant proteins and Co-IP from adenovirus-infected cells\",\n      \"pmids\": [\"14675767\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relevance to endogenous chromatin assembly not established\", \"Single-lab context\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected SET to oncogenic signaling, defining it as a negative regulator of the MEK/ERK proliferative axis and a brake on G1/S transition.\",\n      \"evidence\": \"Reciprocal overexpression/siRNA with ERK/MEK phosphorylation Western blots and flow cytometry\",\n      \"pmids\": [\"15703833\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between PP2A inhibition and ERK suppression not directly dissected\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified an activating role in transcription via direct CBP binding, broadening SET beyond acetyltransferase inhibition and placing it in nucleoplasmic foci.\",\n      \"evidence\": \"Co-IP, confocal microscopy, and reporter transactivation assays\",\n      \"pmids\": [\"16061203\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Apparent contradiction with INHAT inhibitory role unresolved\", \"Promoter context-dependence not mapped\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Placed SET phosphorylation downstream of an oncoprotein, suggesting its activity is regulated by upstream kinase signaling in cancer.\",\n      \"evidence\": \"2D-DIGE phosphoproteomics, in-gel kinase assay, and siRNA in prostate cancer cells\",\n      \"pmids\": [\"15930275\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphorylation site and functional consequence on SET not defined\", \"Direct vs indirect kinase relationship unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended SET function to membrane receptor signaling, showing it directly dampens M3 muscarinic receptor output.\",\n      \"evidence\": \"GST pulldown, reciprocal Co-IP, and siRNA with specific calcium mobilization readouts and controls\",\n      \"pmids\": [\"17065150\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which i3-loop binding attenuates signaling unknown\", \"Whether nuclear SET pools contribute is unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Provided the structural foundation for SET function, defining the dimeric architecture and the earmuff surface that binds histones and DNA.\",\n      \"evidence\": \"2.3 Å X-ray crystallography with mutagenesis and in vitro binding\",\n      \"pmids\": [\"17360516\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of histone- or substrate-bound complex\", \"Does not explain non-histone substrate selectivity\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined SET as a corepressor that occupies GREs and is displaced by ligand-bound GR, and showed the SET-CAN fusion locks repression—mechanistically linking SET to nuclear hormone signaling and oncogenesis.\",\n      \"evidence\": \"Yeast two-hybrid, ChIP, reporter assays, and Co-IP\",\n      \"pmids\": [\"18096310\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality across GR target genes not established\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Built an interaction map identifying CK2 as a kinase acting on SET and metabolic/translation-associated partners, framing SET as a phosphorylation-regulated hub.\",\n      \"evidence\": \"Affinity-MS screen with Co-IP confirmation and in vitro CK2 kinase assay\",\n      \"pmids\": [\"17309103\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequences of most interactions untested\", \"CK2 phosphosite and its effect not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Modeled the leukemogenic activity of the SET-CAN fusion in vivo, linking SET-derived oncoproteins to blocked hematopoietic differentiation.\",\n      \"evidence\": \"Gata1-driven SET-CAN transgenic mice with flow cytometry and bone marrow analysis\",\n      \"pmids\": [\"17620317\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Contribution of native SET domains to the phenotype not isolated\", \"Molecular targets of the fusion in vivo unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Quantified SET's histone preference and mapped the binding determinant to its central region, refining the chaperone mechanism.\",\n      \"evidence\": \"GST pulldown, fluorescence binding (Kd determination), and CD on truncation mutants\",\n      \"pmids\": [\"19358706\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Affinity in the context of full nucleosome assembly not addressed\", \"Single-lab measurements\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified a developmental gene-regulatory role, showing SET binds neuronal marker promoters and restrains differentiation.\",\n      \"evidence\": \"ChIP, siRNA, expression analysis, and Drosophila embryo immunostaining\",\n      \"pmids\": [\"20800572\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct repressive mechanism at these promoters not dissected\", \"Mammalian conservation of neuronal role untested here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established SET as a direct INHAT regulator of p53, mechanistically connecting acetylation shielding to suppression of cell-cycle arrest and apoptosis across species.\",\n      \"evidence\": \"In vitro acetylation, Co-IP, reporter/FACS/TUNEL readouts, and Drosophila genetic rescue\",\n      \"pmids\": [\"21911363\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo tumor-suppressor relevance not addressed\", \"Selectivity among p53 lysines not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed a chromosome-condensation function through direct MCPH1 BRCT-domain binding that restrains condensin II.\",\n      \"evidence\": \"Co-IP, siRNA, condensin II epistasis, and MCPH1 mutant complementation\",\n      \"pmids\": [\"21515671\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SET-MCPH1 binding mechanistically limits condensin II unclear\", \"Cell-cycle timing of the interaction not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined SET as a switch controlling Ku70 acetylation and NHEJ engagement, with DNA damage releasing Ku70/80 to break sites.\",\n      \"evidence\": \"Reciprocal Co-IP, in vitro acetylation, and laser micro-irradiation live imaging with siRNA\",\n      \"pmids\": [\"24305947\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal that triggers SET-Ku70 dissociation not identified\", \"Quantitative impact on repair efficiency not measured\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended INHAT regulation to FoxO1, linking SET to oxidative-stress-responsive p21 transcription.\",\n      \"evidence\": \"In vitro acetylation, Co-IP, luciferase reporter, and RT-PCR\",\n      \"pmids\": [\"24983498\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SET activates or represses FoxO1 targets broadly is unclear\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified the off-switch for SET chaperone activity: nuclear cytochrome c locks its histone-binding domains during DNA damage, blocking nucleosome assembly.\",\n      \"evidence\": \"NMR, ITC, mutagenesis, docking, nucleosome assembly assay, and subcellular fractionation\",\n      \"pmids\": [\"26216969\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream chromatin/apoptotic consequences of this block not fully traced\", \"Kinetics of cytochrome c competition in cells not measured\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated SET's role in safeguarding newly synthesized H4, preventing HAT1 over-acetylation and supporting H4 stability and S-phase progression.\",\n      \"evidence\": \"Proteomics of new-H4 complex, in vitro HAT1 assay, siRNA, and cell-cycle analysis\",\n      \"pmids\": [\"28977641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Division of labor between SET and PP32 not resolved\", \"Link to Hsp90 chaperone pathway mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected SET-driven transcriptional repression to coordinated epigenetic remodeling via TET1-dependent DNA demethylation and reduced histone acetylation.\",\n      \"evidence\": \"Methylation arrays, 5mC/5hmC staining, ChIP, expression panels, and 5-AZA/TSA inhibition\",\n      \"pmids\": [\"28460463\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect control of TET1 not established\", \"Single-lab study\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SET's distinct activities—histone chaperone, INHAT acetylation shielding, PP2A inhibition, and receptor/transcription regulation—are partitioned and coordinated within a cell, and how phosphorylation toggles between them, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated model linking phosphorylation state to which activity dominates\", \"Substrate-selection rules for INHAT shielding undefined\", \"Spatial/temporal regulation across cytosolic and nuclear pools unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 10, 12]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 5, 6, 13, 12]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 5, 6, 13, 14, 16]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [7, 17, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 5, 9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 12, 18]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 7, 13, 17, 18]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 14, 16]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [9, 12, 16]}\n    ],\n    \"complexes\": [\"INHAT complex\"],\n    \"partners\": [\"PP2A\", \"TP53\", \"XRCC6\", \"FOXO1\", \"MCPH1\", \"CREBBP\", \"CHRM3\", \"CSNK2A1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}