{"gene":"AATF","run_date":"2026-04-28T17:12:36","timeline":{"discoveries":[{"year":1999,"finding":"AATF (apoptosis antagonizing transcription factor) was identified as a nuclear phosphoprotein that interacts with Dlk/ZIP kinase (a serine/threonine kinase) and interferes with Dlk-induced apoptosis. AATF contains an acidic domain and a leucine zipper, and a Gal4-BD-AATF fusion protein exhibited strong transactivation activity.","method":"Yeast two-hybrid screen, transactivation assay, apoptosis interference assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, interaction identified by yeast two-hybrid with functional follow-up","pmids":["10580117"],"is_preprint":false},{"year":2000,"finding":"AATF/Che-1 interacts with hRPB11 (a core subunit of RNA polymerase II) and also binds the retinoblastoma protein (Rb) via two distinct domains, repressing Rb-mediated growth suppression and counteracting Rb inhibition of E2F1 transactivation.","method":"Co-immunoprecipitation, two-hybrid, transactivation assay, domain mapping","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal co-IP with functional rescue, single lab","pmids":["10783144"],"is_preprint":false},{"year":2002,"finding":"Che-1/AATF contacts the Rb pocket region and competes with HDAC1 for the same Rb binding site, displacing HDAC1 from the Rb/E2F complex in vitro and from E2F target promoters in vivo, thereby activating DNA synthesis in quiescent cells. Che-1-specific RNAi confirmed its requirement in pocket protein-competent cells.","method":"Co-immunoprecipitation, ChIP, RNA interference, in vitro binding competition, cell cycle assay","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (co-IP, ChIP, RNAi, functional assay) in a single study","pmids":["12450794"],"is_preprint":false},{"year":2003,"finding":"Che-1/AATF activates p21WAF1/CIP1 expression by displacing HDAC1 from Sp1 binding sites on the p21 promoter, leading to accumulation of acetylated histone H3 and G1 growth arrest in colon carcinoma cells.","method":"ChIP, RNA interference, overexpression, cell cycle analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — ChIP showing HDAC1 displacement combined with RNAi and functional readout","pmids":["12847090"],"is_preprint":false},{"year":2003,"finding":"AATF directly interacts with Par-4 (prostate apoptosis response-4) via the leucine zipper domain in neural cells, colocalizing in both cytoplasmic and nuclear compartments. This AATF/Par-4 complex formation is essential for AATF's inhibitory effect on aberrant Aβ-(1-42) production and secretion induced by Par-4.","method":"Co-immunoprecipitation, colocalization, overexpression, Aβ ELISA","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — direct interaction demonstrated with co-IP and functional rescue, single lab","pmids":["14627703"],"is_preprint":false},{"year":2003,"finding":"Che-1/AATF directly interacts with Tau protein in cerebellar granule neurons (CGNs), binding the amino-terminal region of Tau. This interaction is modulated during neuronal apoptosis and was confirmed by co-immunoprecipitation and FRET analysis.","method":"Co-immunoprecipitation, FRET, overexpression","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 — FRET and co-IP confirming direct interaction, single lab","pmids":["14697667"],"is_preprint":false},{"year":2003,"finding":"Che-1/AATF expression is regulated by a negative autoregulatory feedback loop in which the protein binds its own promoter and represses transcription.","method":"ChIP, promoter reporter assay","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and promoter assay, single lab","pmids":["14636992"],"is_preprint":false},{"year":2006,"finding":"ATM/ATR and Chk2 checkpoint kinases physically interact with Che-1/AATF and phosphorylate it in response to DNA damage, promoting its accumulation and stabilization. These modifications induce recruitment of Che-1 to the TP53 and p21 promoters, activating p53 expression and contributing to maintenance of the G2/M checkpoint.","method":"Co-immunoprecipitation, ChIP, kinase assay, siRNA, cell cycle analysis","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 1-2 — kinase interaction, phosphorylation, ChIP, and checkpoint phenotype, multiple orthogonal methods","pmids":["17157788"],"is_preprint":false},{"year":2007,"finding":"In response to apoptotic stimuli, Che-1/AATF interacts with the prolyl isomerase Pin1, and this interaction causes conformational changes that promote Che-1 interaction with the E3 ubiquitin ligase HDM2, leading to ubiquitin-dependent proteasomal degradation of Che-1. A Pin1-binding-deficient Che-1 mutant had an increased half-life and reduced apoptosis.","method":"Co-immunoprecipitation, protein stability assay, site-directed mutagenesis, ubiquitination assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — interaction, mutagenesis, ubiquitination assay, functional phenotype, single lab but multiple orthogonal methods","pmids":["17468107"],"is_preprint":false},{"year":2007,"finding":"NRAGE interacts with Che-1/AATF and inhibits its nuclear localization by sequestering it in the cytoplasmic compartment. NRAGE overexpression targets Che-1 for proteasome-dependent degradation. Overexpression of Che-1 completely reverses NRAGE-induced cell death.","method":"Co-immunoprecipitation, live-cell imaging (EGFP fusion), proteasome inhibitor assay, apoptosis assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — interaction, localization imaging, and functional rescue, single lab","pmids":["17488777"],"is_preprint":false},{"year":2007,"finding":"Che-1/AATF activates XIAP expression in response to DNA damage through a mechanism requiring Che-1 phosphorylation and NF-κB. XIAP expression was found necessary for the anti-apoptotic activity of Che-1.","method":"siRNA, reporter assay, western blot, in vivo xenograft","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 — functional knockdown with defined pathway placement, single lab","pmids":["18049476"],"is_preprint":false},{"year":2009,"finding":"AATF mediates an anti-apoptotic effect of the unfolded protein response (UPR) by being induced through the PERK-eIF2α pathway during ER stress. AATF then transcriptionally activates AKT1 through STAT3, sustaining Akt1 activation and promoting cell survival. RNAi knockdown of AATF or AKT1 sensitized cells to ER stress-mediated cell death.","method":"Gene expression profiling, RNAi, reporter assay, western blot, ER stress cell death assay","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — pathway placement via epistasis (PERK→AATF→STAT3→AKT1) with RNAi and functional readout, multiple orthogonal methods","pmids":["19911006"],"is_preprint":false},{"year":2011,"finding":"PARP-1 directly interacts with Che-1/AATF and promotes its poly(ADP-ribosyl)ation both in vitro and in vivo. This modification is required for Che-1 stabilization following DNA damage, acting independently of ATM kinase activity and controlling Che-1 occupancy at the p21 promoter.","method":"Co-immunoprecipitation, in vitro PARylation assay, PARP inhibition, PARP-1 knockout, ChIP","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro modification assay combined with KO, co-IP, and ChIP; multiple orthogonal methods","pmids":["21317046"],"is_preprint":false},{"year":2012,"finding":"Upon genotoxic stress, AATF is phosphorylated by the checkpoint kinase MK2. This phosphorylation causes release of AATF from cytoplasmic MRLC3 and subsequent nuclear translocation, where AATF binds PUMA, BAX, and BAK promoters to repress p53-driven expression of pro-apoptotic genes. A phospho-mimicking AATF mutant conferred adriamycin resistance in vivo.","method":"Kinase assay, subcellular fractionation, ChIP, site-directed mutagenesis, xenograft model","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — phosphorylation assay, mutagenesis, ChIP, in vivo rescue; multiple orthogonal methods in single rigorous study","pmids":["22909821"],"is_preprint":false},{"year":2012,"finding":"AATF is a nucleolar stress sensor that translocates from the nucleolus to the nucleus upon UV irradiation, physically associating with c-Jun to act as a cofactor for c-Jun-mediated transcription of pro-apoptotic genes (FasL, TNF-α). AATF mutants defective in c-Jun binding failed to induce AP-1 activity or c-Jun-dependent apoptosis.","method":"Co-immunoprecipitation, subcellular localization imaging, reporter assay, domain deletion mutagenesis, c-Jun-deficient MEFs","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — interaction, localization, mutagenesis, and genetic epistasis (c-Jun KO cells), multiple orthogonal methods","pmids":["22933572"],"is_preprint":false},{"year":2013,"finding":"Che-1/AATF localizes at interphase centrosomes in addition to its nuclear localization, accumulating there following DNA damage or spindle poisons. Che-1 depletion generates supernumerary centrosomes, multinucleated cells, and multipolar spindles. Mechanistically, Che-1 depletion abolishes Chk1 binding to pericentrin and its localization at centrosomes, deregulating centrosomal cyclin B-Cdk1 activation and advancing mitotic entry.","method":"Immunofluorescence localization, siRNA, centrosome counting, western blot, spindle checkpoint assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization tied to functional consequence via Chk1/pericentrin pathway, single lab","pmids":["23798705"],"is_preprint":false},{"year":2014,"finding":"HIPK2 interacts with Che-1/AATF and phosphorylates it at specific residues upon genotoxic stress, which strongly increases HDM2/Che-1 interaction and Che-1 degradation via ubiquitin-dependent proteasomal system. HIPK2 depletion decreased Che-1 ubiquitylation and degradation, and Che-1 overexpression counteracted HIPK2-induced apoptosis.","method":"Co-immunoprecipitation, kinase assay, ubiquitination assay, siRNA, apoptosis assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1-2 — kinase assay, ubiquitination assay, genetic rescue, multiple orthogonal methods, single lab","pmids":["25210797"],"is_preprint":false},{"year":2015,"finding":"Che-1/AATF directly binds p53 protein, and this interaction occurs preferentially in a ternary complex with Brca1 in the early hours of DNA damage. Genome-wide ChIP analysis revealed that Che-1/p53 interaction results in preferential transactivation of growth-arrest p53 target genes over pro-apoptotic targets. Che-1+/- mice showed enhanced thymocyte apoptosis after ionizing radiation.","method":"Co-immunoprecipitation, ChIP-seq, genome-wide chromatin occupancy, heterozygous mouse model","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — direct binding, genome-wide ChIP-seq, in vivo genetic model; multiple orthogonal methods","pmids":["25996291"],"is_preprint":false},{"year":2015,"finding":"Under stress conditions (nutrient limitation, hypoxia, DNA damage), Che-1/AATF inhibits mTOR activity by inducing expression of the mTOR inhibitors Redd1 and Deptor, and this activity is required for sustaining stress-induced autophagy.","method":"siRNA, western blot, autophagy assay, qRT-PCR, mTOR activity assay","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — depletion with defined transcriptional targets and autophagy phenotype, single lab","pmids":["25770584"],"is_preprint":false},{"year":2016,"finding":"AATF forms a salt-stable protein complex with neuroguidin (NGDN) and NOL10 (the ANN complex). All three ANN complex members localize to nucleoli with mutual dependence for protein stability. The ANN complex supports nucleolar steps of 40S ribosomal subunit biosynthesis, being required for 18S rRNA maturation and specific nucleolar cleavage steps in the 5'ETS and ITS1 regions.","method":"Immunoprecipitation, domain mapping, siRNA depletion, rRNA processing assay, northern blot, nucleolar localization","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — complex identification with domain mapping, three independent depletions showing same processing defect; multiple orthogonal methods","pmids":["27599843"],"is_preprint":false},{"year":2017,"finding":"Che-1/AATF interacts with subunits of the HAT module of SAGA complexes (ADA2A, ADA2B, and GCN5), as demonstrated by co-immunoprecipitation and yeast two-hybrid with domain delineation.","method":"Co-immunoprecipitation, yeast two-hybrid, colocalization","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP and two-hybrid interaction with domain mapping, single lab","pmids":["29232376"],"is_preprint":false},{"year":2018,"finding":"In Kras-driven murine lung adenocarcinomas, AATF/Che-1 is required to sustain tumor progression predominantly in a p53-dependent manner. In an autochthonous model, Aatf deletion delayed lung cancer formation, and targeting Aatf in existing tumors halted tumor progression, establishing AATF as a key suppressor of p53-driven apoptosis in vivo.","method":"Conditional knockout mouse, dual recombinase strategy, lung adenocarcinoma model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic epistasis with p53 in autochthonous cancer model, rigorous controls","pmids":["29321668"],"is_preprint":false},{"year":2019,"finding":"CLIP-sequencing showed that AATF predominantly binds 45S pre-ribosomal RNA precursor molecules, with binding sites localizing near the SSU cleavage sites. AATF also binds mRNAs encoding ribosome biogenesis factors and snoRNAs. Mass spectrometry interactome analysis confirmed interactions with a large set of proteins involved in rRNA maturation required for small ribosomal subunit (SSU) generation.","method":"CLIP-seq, mass spectrometry interactome, RNA-binding analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1-2 — CLIP-seq and MS interactome in single comprehensive study with multiple orthogonal approaches","pmids":["31363146"],"is_preprint":false},{"year":2020,"finding":"Che-1/AATF interacts with RNA polymerase I and the nucleolar upstream binding factor (UBF), promotes RNA polymerase I-dependent transcription, and binds the rDNA promoter, modulating its epigenetic state by competing with HDAC1. Upon DNA damage, Che-1 relocalizes from rDNA to the TP53 promoter.","method":"Co-immunoprecipitation, ChIP, rRNA synthesis assay, RNAi, nucleolar morphology analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — interaction, ChIP at rDNA, functional rRNA synthesis readout, and dynamic relocalization upon damage; multiple methods","pmids":["32421830"],"is_preprint":false},{"year":2020,"finding":"Che-1/AATF promotes cell proliferation in multiple myeloma by directly interacting with histones and displacing HDAC class I members from them, sustaining global histone acetylation and gene expression. Transgenic mice expressing human Che-1 in plasma cells develop multiple myeloma.","method":"Co-immunoprecipitation, histone acetylation assay, transgenic mouse model, siRNA","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 2 — direct histone interaction with functional readout, in vivo transgenic model, single lab with multiple methods","pmids":["33186461"],"is_preprint":false},{"year":2021,"finding":"CK2 protein kinase phosphorylates Che-1/AATF at Ser316, Ser320, and Ser321 in vitro and in vivo. These phosphorylation events are required for Che-1/histone H3 binding and for Che-1's pro-proliferative activity.","method":"In vitro kinase assay, site-directed mutagenesis, 2D gel electrophoresis, mass spectrometry, co-immunoprecipitation, proliferation assay","journal":"Journal of experimental & clinical cancer research","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay with mutagenesis and functional rescue; multiple orthogonal methods","pmids":["34266450"],"is_preprint":false},{"year":2022,"finding":"AATF/Che-1 localizes to paraspeckles via interaction with the lncRNA NEAT1_2 and directly localizes on R-loops. Depletion of Che-1 produces marked accumulation of RNA:DNA hybrids (R-loops), which triggers sustained activation of an interferon gene expression signature, indicating that Che-1/NEAT1 cooperation prevents excessive inflammatory signaling by facilitating R-loop clearance.","method":"Co-immunoprecipitation with NEAT1, R-loop immunoprecipitation (S9.6 antibody), RNA-seq, siRNA, paraspeckle localization imaging","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — RNA interaction, R-loop accumulation assay, transcriptomic readout; multiple methods, single lab","pmids":["35929179"],"is_preprint":false},{"year":2022,"finding":"AATF competitively interacts with nuclear AIF (apoptosis-inducing factor) to inhibit AIF from binding DNA, thereby inhibiting parthanatos in neuronal ischemia-reperfusion models. AATF overexpression reduced infarct volume and neuronal death in a dMCAO/R model.","method":"Co-immunoprecipitation, competitive binding assay, DNA fragmentation assay, OGD/R and dMCAO/R models, viral overexpression","journal":"Journal of molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — interaction with functional consequence in both in vitro and in vivo models, single lab","pmids":["36058992"],"is_preprint":false},{"year":2025,"finding":"AATF interacts with XRCC4 (a core NHEJ subunit), preventing its ubiquitin-mediated proteasomal degradation. Upon DNA damage, ATM phosphorylates AATF at Ser189, causing its dissociation from XRCC4 and enabling rapid XRCC4 recruitment to DNA break sites for efficient NHEJ repair. AATF depletion or expression of phosphorylation-deficient AATF impaired NHEJ and sensitized glioblastoma xenografts to chemoradiotherapy.","method":"Co-immunoprecipitation, mass spectrometry, in vitro phosphorylation assay, site-directed mutagenesis, NHEJ assay, xenograft model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — co-IP, ATM kinase assay, mutagenesis, NHEJ functional assay, in vivo model; multiple orthogonal methods","pmids":["40436899"],"is_preprint":false}],"current_model":"AATF/Che-1 is a multifunctional nuclear/nucleolar RNA polymerase II-binding protein that: (1) competes with HDAC1 for Rb and Sp1 binding to promote E2F-dependent proliferation and p21-dependent growth arrest; (2) is phosphorylated by ATM/ATR/Chk2 and MK2 upon genotoxic stress, driving nuclear translocation to activate p53/p21 transcription while repressing pro-apoptotic PUMA/BAX/BAK genes; (3) is stabilized by PARP-1-mediated PARylation and destabilized by HIPK2 phosphorylation promoting Pin1/HDM2-dependent ubiquitin-proteasomal degradation; (4) forms a stable ANN complex with NGDN and NOL10 to support 40S ribosomal subunit biogenesis by binding pre-rRNA and RNA polymerase I/UBF; (5) localizes to paraspeckles via NEAT1 lncRNA to resolve R-loops and suppress interferon signaling; (6) protects XRCC4 from degradation and is released from XRCC4 upon ATM-mediated phosphorylation at Ser189 to enable NHEJ DNA repair; and (7) interacts with binding partners including Dlk, Par-4, Tau, c-Jun, and AIF to modulate apoptotic outcomes in diverse stress contexts."},"narrative":{"teleology":[{"year":1999,"claim":"Establishing AATF as a nuclear phosphoprotein with transactivation capacity that antagonizes kinase-induced apoptosis resolved the initial identity of the gene product and its anti-apoptotic orientation.","evidence":"Yeast two-hybrid identification of Dlk/ZIP kinase interaction, Gal4 transactivation assay, and apoptosis interference assay","pmids":["10580117"],"confidence":"Medium","gaps":["Dlk interaction validated only by yeast two-hybrid with overexpression follow-up","endogenous relevance of Dlk–AATF axis unresolved","mechanism of apoptosis inhibition undefined"]},{"year":2000,"claim":"Demonstrating that AATF/Che-1 binds both RNA polymerase II (via hRPB11) and Rb established it as a transcriptional cofactor that modulates Rb-mediated growth suppression and E2F1 transactivation.","evidence":"Co-immunoprecipitation, two-hybrid, and transactivation rescue assays","pmids":["10783144"],"confidence":"Medium","gaps":["Rb interaction domains mapped but stoichiometry and in vivo relevance not established","no genome-wide target identification"]},{"year":2002,"claim":"Showing that Che-1 competes with HDAC1 for the Rb pocket and is recruited to E2F target promoters resolved the mechanism by which AATF promotes cell cycle entry — through derepression of E2F targets via HDAC1 displacement.","evidence":"In vitro binding competition, ChIP at E2F promoters, RNAi in pocket-protein-competent cells, cell cycle assay","pmids":["12450794"],"confidence":"High","gaps":["Whether HDAC1 displacement is the sole mechanism for E2F activation","contribution of other pocket proteins (p107, p130) not dissected"]},{"year":2003,"claim":"Extending the HDAC1-displacement mechanism to the p21 promoter via Sp1 showed that AATF drives growth arrest as well as proliferation depending on promoter context, revealing context-dependent transcriptional outcomes.","evidence":"ChIP at Sp1 sites on p21 promoter, RNAi, histone acetylation analysis, cell cycle assay in colon carcinoma cells","pmids":["12847090"],"confidence":"High","gaps":["How AATF is directed to proliferative versus growth-arrest promoters is unclear","Sp1/HDAC1 competition not reconstituted with purified components"]},{"year":2003,"claim":"Identification of Par-4 and Tau as AATF-binding partners in neural cells broadened the functional scope of AATF beyond cell cycle control to neuronal apoptosis regulation and Aβ production.","evidence":"Co-immunoprecipitation, FRET (for Tau), colocalization, Aβ ELISA (for Par-4) in cerebellar granule neurons and neural cell lines","pmids":["14627703","14697667"],"confidence":"Medium","gaps":["Physiological relevance in neurodegeneration models not tested","downstream signaling mechanisms linking AATF-Par-4 to Aβ production undefined"]},{"year":2006,"claim":"Discovery that ATM/ATR and Chk2 phosphorylate and stabilize Che-1 upon DNA damage, recruiting it to the p53 and p21 promoters, placed AATF squarely in the DNA damage checkpoint signaling cascade and explained its damage-induced stabilization.","evidence":"Kinase assay, co-immunoprecipitation with ATM/ATR/Chk2, ChIP at p53 promoter, siRNA, G2/M checkpoint analysis","pmids":["17157788"],"confidence":"High","gaps":["Specific phosphorylation sites mediating each functional outcome not fully mapped","relative contributions of ATM versus ATR not separated"]},{"year":2007,"claim":"Elucidation of the Pin1/HDM2-dependent degradation pathway showed how apoptotic signals eliminate AATF's anti-apoptotic function, establishing that the balance between kinase-mediated stabilization and Pin1/HDM2-dependent turnover dictates cell fate.","evidence":"Co-immunoprecipitation, ubiquitination assay, protein stability assay, Pin1-binding-deficient mutagenesis","pmids":["17468107"],"confidence":"High","gaps":["Identity of the proline-directed kinase priming Pin1 binding unclear","whether this pathway operates in all cell types not addressed"]},{"year":2009,"claim":"Positioning AATF downstream of the PERK–eIF2α UPR branch as a transcriptional activator of AKT1 via STAT3 revealed a new stress-responsive axis extending AATF's survival function beyond DNA damage to ER stress.","evidence":"Gene expression profiling, RNAi epistasis (PERK→AATF→STAT3→AKT1), ER stress cell death assay","pmids":["19911006"],"confidence":"High","gaps":["Direct binding of AATF to AKT1 promoter not shown by ChIP in this study","mechanism of PERK/eIF2α-mediated AATF induction not delineated"]},{"year":2011,"claim":"Identification of PARP-1-mediated PARylation as an ATM-independent stabilization mechanism for Che-1 added a second post-translational axis controlling AATF protein levels and its promoter occupancy at p21.","evidence":"In vitro PARylation assay, PARP-1 knockout cells, PARP inhibition, ChIP at p21 promoter","pmids":["21317046"],"confidence":"High","gaps":["Sites of PARylation on AATF not mapped","interplay between PARylation and phosphorylation not resolved"]},{"year":2012,"claim":"Demonstration that MK2 phosphorylates AATF to release it from cytoplasmic MRLC3, enabling nuclear entry and selective repression of pro-apoptotic p53 targets (PUMA, BAX, BAK), resolved how genotoxic stress channels AATF toward anti-apoptotic gene regulation.","evidence":"Kinase assay, subcellular fractionation, ChIP at PUMA/BAX/BAK promoters, phospho-mimicking mutagenesis, xenograft model","pmids":["22909821"],"confidence":"High","gaps":["Mechanism of selective repression of pro-apoptotic versus growth-arrest promoters not fully explained","MRLC3 sequestration mechanism not structurally characterized"]},{"year":2014,"claim":"Showing that HIPK2 phosphorylation promotes HDM2-mediated ubiquitination and degradation of Che-1 identified the upstream kinase that primes the degradation switch, complementing the earlier Pin1/HDM2 pathway and establishing a pro-apoptotic kinase–AATF antagonism.","evidence":"Kinase assay, ubiquitination assay, siRNA of HIPK2, apoptosis rescue by Che-1 overexpression","pmids":["25210797"],"confidence":"High","gaps":["Relationship between HIPK2 and Pin1 in sequential modification not tested","specific HIPK2 phosphosites and their individual contributions not fully resolved"]},{"year":2015,"claim":"ChIP-seq demonstration that Che-1 forms a ternary complex with p53 and BRCA1 to preferentially activate growth-arrest over pro-apoptotic p53 targets, validated in Che-1+/− mice, provided genome-wide evidence for how AATF biases p53 output toward survival.","evidence":"ChIP-seq, co-immunoprecipitation, heterozygous mouse model with ionizing radiation challenge","pmids":["25996291"],"confidence":"High","gaps":["BRCA1's structural role in the ternary complex undefined","complete null mouse phenotype not reported"]},{"year":2016,"claim":"Identification of the ANN complex (AATF–NGDN–NOL10) and its requirement for 18S rRNA maturation established AATF as a core component of small ribosomal subunit biogenesis, revealing a function independent of its transcriptional activities.","evidence":"Immunoprecipitation, domain mapping, siRNA depletion of each component, northern blot rRNA processing assay, nucleolar localization","pmids":["27599843"],"confidence":"High","gaps":["Enzymatic activity within the ANN complex not identified","whether ANN complex function is linked to AATF's stress-responsive roles unknown"]},{"year":2019,"claim":"CLIP-seq mapping of AATF RNA-binding sites to 45S pre-rRNA near SSU cleavage regions, combined with a comprehensive mass spectrometry interactome, confirmed direct RNA engagement and connected AATF to a broad rRNA maturation protein network.","evidence":"CLIP-seq, mass spectrometry interactome analysis","pmids":["31363146"],"confidence":"High","gaps":["Structure of AATF–pre-rRNA complex not determined","RNA-binding domain not delineated"]},{"year":2020,"claim":"Showing that Che-1 occupies the rDNA promoter, interacts with RNA Pol I and UBF, and dynamically relocalizes from rDNA to the p53 promoter upon DNA damage unified AATF's ribosome biogenesis and DNA damage transcription functions as a nucleolar stress sensor.","evidence":"ChIP at rDNA promoter, co-immunoprecipitation with Pol I/UBF, rRNA synthesis assay, damage-induced relocalization","pmids":["32421830"],"confidence":"High","gaps":["Signal triggering relocalization from rDNA to p53 promoter not identified","whether Pol I interaction requires the ANN complex unclear"]},{"year":2020,"claim":"Demonstration that Che-1 directly binds histones, displaces class I HDACs globally, and sustains histone acetylation — with transgenic Che-1 mice developing multiple myeloma — extended the HDAC-displacement mechanism from promoter-specific to genome-wide and established oncogenic potential in plasma cells.","evidence":"Co-immunoprecipitation with histones, histone acetylation assay, transgenic mouse model, siRNA","pmids":["33186461"],"confidence":"High","gaps":["Specificity of histone mark changes not profiled genome-wide","whether CK2 phosphorylation is required for histone binding in vivo not tested in this study"]},{"year":2021,"claim":"Identification of CK2 as a kinase phosphorylating Che-1 at Ser316/320/321 to enable histone H3 binding provided the post-translational mechanism controlling AATF's HDAC-displacement and proliferative activity.","evidence":"In vitro kinase assay, site-directed mutagenesis, mass spectrometry, co-immunoprecipitation with histone H3, proliferation assay","pmids":["34266450"],"confidence":"High","gaps":["Whether CK2 phosphorylation intersects with ATM/MK2 phosphorylation cascades unknown","structural basis for phospho-dependent histone binding not resolved"]},{"year":2022,"claim":"Discovery that AATF localizes to paraspeckles via NEAT1 lncRNA and directly resolves R-loops, with its depletion triggering interferon gene activation, revealed a novel genome-integrity function connecting AATF to innate immune suppression.","evidence":"NEAT1 co-immunoprecipitation, S9.6 R-loop immunoprecipitation, RNA-seq, siRNA, paraspeckle imaging","pmids":["35929179"],"confidence":"High","gaps":["Enzymatic or catalytic mechanism of R-loop resolution by AATF not identified","whether R-loop function depends on the ANN complex or other partners unknown"]},{"year":2025,"claim":"Establishing that AATF protects XRCC4 from ubiquitin-mediated degradation and that ATM-mediated Ser189 phosphorylation releases AATF from XRCC4 to permit NHEJ defined a direct DNA repair function and a damage-responsive switch with therapeutic relevance in glioblastoma.","evidence":"Co-immunoprecipitation, mass spectrometry, in vitro ATM phosphorylation assay, Ser189 mutagenesis, NHEJ reporter assay, glioblastoma xenograft model","pmids":["40436899"],"confidence":"High","gaps":["Whether AATF also affects alternative end-joining or homologous recombination","structural basis of AATF–XRCC4 interaction unknown","relationship between Ser189 phosphorylation and other ATM-dependent AATF phosphorylation events not clarified"]},{"year":null,"claim":"Key unresolved questions include the structural basis of AATF's RNA-binding and histone-binding activities, how AATF is coordinately regulated by its multiple kinase inputs (ATM, MK2, CK2, HIPK2) to select between transcriptional programs, and whether its ribosome biogenesis, R-loop resolution, and NHEJ functions are mechanistically interconnected.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of AATF or its complexes available","integrated signaling model for multi-kinase regulation lacking","functional hierarchy among ribosome biogenesis, R-loop resolution, and NHEJ roles not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,3,7,13,17,23,24]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[22,26]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[24,25]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[6,23]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,7,13,14,17,26]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[19,22,23]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[15]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9,13]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,2,3,7,17,23,24]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[7,28]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2,3,15]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,8,13,16,17]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[19,22,23]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[18]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[7,11,13]}],"complexes":["ANN complex (AATF–NGDN–NOL10)"],"partners":["NGDN","NOL10","RB1","TP53","HDAC1","XRCC4","NEAT1","BRCA1"],"other_free_text":[]},"mechanistic_narrative":"AATF/Che-1 is a multifunctional nuclear and nucleolar protein that integrates transcriptional regulation, ribosome biogenesis, DNA repair, and R-loop resolution to govern cell proliferation and stress responses. It binds RNA polymerase II, retinoblastoma protein (Rb), and histones, displacing HDAC1 from Rb/E2F complexes, Sp1-containing promoters, and chromatin to activate E2F-dependent proliferation, p21-mediated growth arrest, and global histone acetylation [PMID:12450794, PMID:12847090, PMID:33186461]. Upon genotoxic stress, AATF is phosphorylated by ATM/ATR/Chk2, MK2, and CK2, which drive its nuclear translocation, stabilization, and selective recruitment to p53/p21 promoters while repressing pro-apoptotic targets (PUMA, BAX, BAK), and ATM-mediated Ser189 phosphorylation releases AATF from XRCC4 to enable NHEJ repair [PMID:17157788, PMID:22909821, PMID:40436899]. As a core subunit of the ANN complex (with NGDN and NOL10), AATF binds 45S pre-rRNA near SSU cleavage sites and interacts with RNA polymerase I/UBF to promote 18S rRNA maturation and 40S ribosomal subunit biogenesis, and it localizes to paraspeckles via NEAT1 lncRNA to resolve R-loops and suppress interferon signaling [PMID:27599843, PMID:31363146, PMID:32421830, PMID:35929179]."},"prefetch_data":{"uniprot":{"accession":"Q9NY61","full_name":"Protein AATF","aliases":["Apoptosis-antagonizing transcription factor","Rb-binding protein Che-1"],"length_aa":560,"mass_kda":63.1,"function":"Part of the small subunit (SSU) processome, first precursor of the small eukaryotic ribosomal subunit. During the assembly of the SSU processome in the nucleolus, many ribosome biogenesis factors, an RNA chaperone and ribosomal proteins associate with the nascent pre-rRNA and work in concert to generate RNA folding, modifications, rearrangements and cleavage as well as targeted degradation of pre-ribosomal RNA by the RNA exosome (PubMed:34516797). May function as a general inhibitor of the histone deacetylase HDAC1. Binding to the pocket region of RB1 may displace HDAC1 from RB1/E2F complexes, leading to activation of E2F target genes and cell cycle progression. Conversely, displacement of HDAC1 from SP1 bound to the CDKN1A promoter leads to increased expression of this CDK inhibitor and blocks cell cycle progression. Also antagonizes PAWR mediated induction of aberrant amyloid peptide production in Alzheimer disease (presenile and senile dementia), although the molecular basis for this phenomenon has not been described to date","subcellular_location":"Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/Q9NY61/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/AATF","classification":"Common Essential","n_dependent_lines":1029,"n_total_lines":1208,"dependency_fraction":0.8518211920529801},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000275700","cell_line_id":"CID001083","localizations":[{"compartment":"nucleolus_gc","grade":3}],"interactors":[{"gene":"NGDN","stoichiometry":4.0},{"gene":"EVPL","stoichiometry":0.2},{"gene":"MSN","stoichiometry":0.2},{"gene":"RAB11A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001083","total_profiled":1310},"omim":[{"mim_id":"608463","title":"APOPTOSIS-ANTAGONIZING TRANSCRIPTION FACTOR; AATF","url":"https://www.omim.org/entry/608463"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/AATF"},"hgnc":{"alias_symbol":["DED","CHE-1","CHE1","BFR2"],"prev_symbol":[]},"alphafold":{"accession":"Q9NY61","domains":[{"cath_id":"-","chopping":"460-500","consensus_level":"medium","plddt":68.582,"start":460,"end":500}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NY61","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NY61-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NY61-F1-predicted_aligned_error_v6.png","plddt_mean":64.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AATF","jax_strain_url":"https://www.jax.org/strain/search?query=AATF"},"sequence":{"accession":"Q9NY61","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NY61.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NY61/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NY61"}},"corpus_meta":[{"pmid":"10200473","id":"PMC_10200473","title":"Cell death attenuation by 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SARS-CoV-2.","date":"2021","source":"Viruses","url":"https://pubmed.ncbi.nlm.nih.gov/34202565","citation_count":7,"is_preprint":false},{"pmid":"31963803","id":"PMC_31963803","title":"Titanium Porous Coating Using 3D Direct Energy Deposition (DED) Printing for Cementless TKA Implants: Does It Induce Chronic Inflammation?","date":"2020","source":"Materials (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/31963803","citation_count":7,"is_preprint":false},{"pmid":"27012205","id":"PMC_27012205","title":"Che-1 gene silencing induces osteosarcoma cell apoptosis by inhibiting mutant p53 expression.","date":"2016","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/27012205","citation_count":7,"is_preprint":false},{"pmid":"34266450","id":"PMC_34266450","title":"CK2-mediated phosphorylation of Che-1/AATF is required for its pro-proliferative activity.","date":"2021","source":"Journal of experimental & clinical cancer research : 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the generation of truncated AATF protein to ensure oncogenic transformation.","date":"2016","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/27611213","citation_count":5,"is_preprint":false},{"pmid":"29232376","id":"PMC_29232376","title":"Che1/AATF interacts with subunits of the histone acetyltransferase core module of SAGA complexes.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/29232376","citation_count":5,"is_preprint":false},{"pmid":"22960635","id":"PMC_22960635","title":"Che-ating death: CHE1/AATF protects from p53-mediated apoptosis.","date":"2012","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/22960635","citation_count":4,"is_preprint":false},{"pmid":"36058992","id":"PMC_36058992","title":"AATF Competitively Interacts with Nuclear AIF and Inhibits Parthanatos of Neurons in dMCAO/R and OGD/R Models.","date":"2022","source":"Journal of molecular neuroscience : 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AATF contains an acidic domain and a leucine zipper, and a Gal4-BD-AATF fusion protein exhibited strong transactivation activity.\",\n      \"method\": \"Yeast two-hybrid screen, transactivation assay, apoptosis interference assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, interaction identified by yeast two-hybrid with functional follow-up\",\n      \"pmids\": [\"10580117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"AATF/Che-1 interacts with hRPB11 (a core subunit of RNA polymerase II) and also binds the retinoblastoma protein (Rb) via two distinct domains, repressing Rb-mediated growth suppression and counteracting Rb inhibition of E2F1 transactivation.\",\n      \"method\": \"Co-immunoprecipitation, two-hybrid, transactivation assay, domain mapping\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with functional rescue, single lab\",\n      \"pmids\": [\"10783144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Che-1/AATF contacts the Rb pocket region and competes with HDAC1 for the same Rb binding site, displacing HDAC1 from the Rb/E2F complex in vitro and from E2F target promoters in vivo, thereby activating DNA synthesis in quiescent cells. Che-1-specific RNAi confirmed its requirement in pocket protein-competent cells.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, RNA interference, in vitro binding competition, cell cycle assay\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (co-IP, ChIP, RNAi, functional assay) in a single study\",\n      \"pmids\": [\"12450794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Che-1/AATF activates p21WAF1/CIP1 expression by displacing HDAC1 from Sp1 binding sites on the p21 promoter, leading to accumulation of acetylated histone H3 and G1 growth arrest in colon carcinoma cells.\",\n      \"method\": \"ChIP, RNA interference, overexpression, cell cycle analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP showing HDAC1 displacement combined with RNAi and functional readout\",\n      \"pmids\": [\"12847090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"AATF directly interacts with Par-4 (prostate apoptosis response-4) via the leucine zipper domain in neural cells, colocalizing in both cytoplasmic and nuclear compartments. This AATF/Par-4 complex formation is essential for AATF's inhibitory effect on aberrant Aβ-(1-42) production and secretion induced by Par-4.\",\n      \"method\": \"Co-immunoprecipitation, colocalization, overexpression, Aβ ELISA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction demonstrated with co-IP and functional rescue, single lab\",\n      \"pmids\": [\"14627703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Che-1/AATF directly interacts with Tau protein in cerebellar granule neurons (CGNs), binding the amino-terminal region of Tau. This interaction is modulated during neuronal apoptosis and was confirmed by co-immunoprecipitation and FRET analysis.\",\n      \"method\": \"Co-immunoprecipitation, FRET, overexpression\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — FRET and co-IP confirming direct interaction, single lab\",\n      \"pmids\": [\"14697667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Che-1/AATF expression is regulated by a negative autoregulatory feedback loop in which the protein binds its own promoter and represses transcription.\",\n      \"method\": \"ChIP, promoter reporter assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and promoter assay, single lab\",\n      \"pmids\": [\"14636992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ATM/ATR and Chk2 checkpoint kinases physically interact with Che-1/AATF and phosphorylate it in response to DNA damage, promoting its accumulation and stabilization. These modifications induce recruitment of Che-1 to the TP53 and p21 promoters, activating p53 expression and contributing to maintenance of the G2/M checkpoint.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, kinase assay, siRNA, cell cycle analysis\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — kinase interaction, phosphorylation, ChIP, and checkpoint phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"17157788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In response to apoptotic stimuli, Che-1/AATF interacts with the prolyl isomerase Pin1, and this interaction causes conformational changes that promote Che-1 interaction with the E3 ubiquitin ligase HDM2, leading to ubiquitin-dependent proteasomal degradation of Che-1. A Pin1-binding-deficient Che-1 mutant had an increased half-life and reduced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, protein stability assay, site-directed mutagenesis, ubiquitination assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — interaction, mutagenesis, ubiquitination assay, functional phenotype, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"17468107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NRAGE interacts with Che-1/AATF and inhibits its nuclear localization by sequestering it in the cytoplasmic compartment. NRAGE overexpression targets Che-1 for proteasome-dependent degradation. Overexpression of Che-1 completely reverses NRAGE-induced cell death.\",\n      \"method\": \"Co-immunoprecipitation, live-cell imaging (EGFP fusion), proteasome inhibitor assay, apoptosis assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — interaction, localization imaging, and functional rescue, single lab\",\n      \"pmids\": [\"17488777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Che-1/AATF activates XIAP expression in response to DNA damage through a mechanism requiring Che-1 phosphorylation and NF-κB. XIAP expression was found necessary for the anti-apoptotic activity of Che-1.\",\n      \"method\": \"siRNA, reporter assay, western blot, in vivo xenograft\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional knockdown with defined pathway placement, single lab\",\n      \"pmids\": [\"18049476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"AATF mediates an anti-apoptotic effect of the unfolded protein response (UPR) by being induced through the PERK-eIF2α pathway during ER stress. AATF then transcriptionally activates AKT1 through STAT3, sustaining Akt1 activation and promoting cell survival. RNAi knockdown of AATF or AKT1 sensitized cells to ER stress-mediated cell death.\",\n      \"method\": \"Gene expression profiling, RNAi, reporter assay, western blot, ER stress cell death assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pathway placement via epistasis (PERK→AATF→STAT3→AKT1) with RNAi and functional readout, multiple orthogonal methods\",\n      \"pmids\": [\"19911006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PARP-1 directly interacts with Che-1/AATF and promotes its poly(ADP-ribosyl)ation both in vitro and in vivo. This modification is required for Che-1 stabilization following DNA damage, acting independently of ATM kinase activity and controlling Che-1 occupancy at the p21 promoter.\",\n      \"method\": \"Co-immunoprecipitation, in vitro PARylation assay, PARP inhibition, PARP-1 knockout, ChIP\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro modification assay combined with KO, co-IP, and ChIP; multiple orthogonal methods\",\n      \"pmids\": [\"21317046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Upon genotoxic stress, AATF is phosphorylated by the checkpoint kinase MK2. This phosphorylation causes release of AATF from cytoplasmic MRLC3 and subsequent nuclear translocation, where AATF binds PUMA, BAX, and BAK promoters to repress p53-driven expression of pro-apoptotic genes. A phospho-mimicking AATF mutant conferred adriamycin resistance in vivo.\",\n      \"method\": \"Kinase assay, subcellular fractionation, ChIP, site-directed mutagenesis, xenograft model\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — phosphorylation assay, mutagenesis, ChIP, in vivo rescue; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"22909821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"AATF is a nucleolar stress sensor that translocates from the nucleolus to the nucleus upon UV irradiation, physically associating with c-Jun to act as a cofactor for c-Jun-mediated transcription of pro-apoptotic genes (FasL, TNF-α). AATF mutants defective in c-Jun binding failed to induce AP-1 activity or c-Jun-dependent apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization imaging, reporter assay, domain deletion mutagenesis, c-Jun-deficient MEFs\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — interaction, localization, mutagenesis, and genetic epistasis (c-Jun KO cells), multiple orthogonal methods\",\n      \"pmids\": [\"22933572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Che-1/AATF localizes at interphase centrosomes in addition to its nuclear localization, accumulating there following DNA damage or spindle poisons. Che-1 depletion generates supernumerary centrosomes, multinucleated cells, and multipolar spindles. Mechanistically, Che-1 depletion abolishes Chk1 binding to pericentrin and its localization at centrosomes, deregulating centrosomal cyclin B-Cdk1 activation and advancing mitotic entry.\",\n      \"method\": \"Immunofluorescence localization, siRNA, centrosome counting, western blot, spindle checkpoint assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization tied to functional consequence via Chk1/pericentrin pathway, single lab\",\n      \"pmids\": [\"23798705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HIPK2 interacts with Che-1/AATF and phosphorylates it at specific residues upon genotoxic stress, which strongly increases HDM2/Che-1 interaction and Che-1 degradation via ubiquitin-dependent proteasomal system. HIPK2 depletion decreased Che-1 ubiquitylation and degradation, and Che-1 overexpression counteracted HIPK2-induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, kinase assay, ubiquitination assay, siRNA, apoptosis assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — kinase assay, ubiquitination assay, genetic rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"25210797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Che-1/AATF directly binds p53 protein, and this interaction occurs preferentially in a ternary complex with Brca1 in the early hours of DNA damage. Genome-wide ChIP analysis revealed that Che-1/p53 interaction results in preferential transactivation of growth-arrest p53 target genes over pro-apoptotic targets. Che-1+/- mice showed enhanced thymocyte apoptosis after ionizing radiation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, genome-wide chromatin occupancy, heterozygous mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding, genome-wide ChIP-seq, in vivo genetic model; multiple orthogonal methods\",\n      \"pmids\": [\"25996291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Under stress conditions (nutrient limitation, hypoxia, DNA damage), Che-1/AATF inhibits mTOR activity by inducing expression of the mTOR inhibitors Redd1 and Deptor, and this activity is required for sustaining stress-induced autophagy.\",\n      \"method\": \"siRNA, western blot, autophagy assay, qRT-PCR, mTOR activity assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — depletion with defined transcriptional targets and autophagy phenotype, single lab\",\n      \"pmids\": [\"25770584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AATF forms a salt-stable protein complex with neuroguidin (NGDN) and NOL10 (the ANN complex). All three ANN complex members localize to nucleoli with mutual dependence for protein stability. The ANN complex supports nucleolar steps of 40S ribosomal subunit biosynthesis, being required for 18S rRNA maturation and specific nucleolar cleavage steps in the 5'ETS and ITS1 regions.\",\n      \"method\": \"Immunoprecipitation, domain mapping, siRNA depletion, rRNA processing assay, northern blot, nucleolar localization\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — complex identification with domain mapping, three independent depletions showing same processing defect; multiple orthogonal methods\",\n      \"pmids\": [\"27599843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Che-1/AATF interacts with subunits of the HAT module of SAGA complexes (ADA2A, ADA2B, and GCN5), as demonstrated by co-immunoprecipitation and yeast two-hybrid with domain delineation.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, colocalization\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP and two-hybrid interaction with domain mapping, single lab\",\n      \"pmids\": [\"29232376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In Kras-driven murine lung adenocarcinomas, AATF/Che-1 is required to sustain tumor progression predominantly in a p53-dependent manner. In an autochthonous model, Aatf deletion delayed lung cancer formation, and targeting Aatf in existing tumors halted tumor progression, establishing AATF as a key suppressor of p53-driven apoptosis in vivo.\",\n      \"method\": \"Conditional knockout mouse, dual recombinase strategy, lung adenocarcinoma model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic epistasis with p53 in autochthonous cancer model, rigorous controls\",\n      \"pmids\": [\"29321668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CLIP-sequencing showed that AATF predominantly binds 45S pre-ribosomal RNA precursor molecules, with binding sites localizing near the SSU cleavage sites. AATF also binds mRNAs encoding ribosome biogenesis factors and snoRNAs. Mass spectrometry interactome analysis confirmed interactions with a large set of proteins involved in rRNA maturation required for small ribosomal subunit (SSU) generation.\",\n      \"method\": \"CLIP-seq, mass spectrometry interactome, RNA-binding analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — CLIP-seq and MS interactome in single comprehensive study with multiple orthogonal approaches\",\n      \"pmids\": [\"31363146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Che-1/AATF interacts with RNA polymerase I and the nucleolar upstream binding factor (UBF), promotes RNA polymerase I-dependent transcription, and binds the rDNA promoter, modulating its epigenetic state by competing with HDAC1. Upon DNA damage, Che-1 relocalizes from rDNA to the TP53 promoter.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, rRNA synthesis assay, RNAi, nucleolar morphology analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — interaction, ChIP at rDNA, functional rRNA synthesis readout, and dynamic relocalization upon damage; multiple methods\",\n      \"pmids\": [\"32421830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Che-1/AATF promotes cell proliferation in multiple myeloma by directly interacting with histones and displacing HDAC class I members from them, sustaining global histone acetylation and gene expression. Transgenic mice expressing human Che-1 in plasma cells develop multiple myeloma.\",\n      \"method\": \"Co-immunoprecipitation, histone acetylation assay, transgenic mouse model, siRNA\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct histone interaction with functional readout, in vivo transgenic model, single lab with multiple methods\",\n      \"pmids\": [\"33186461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CK2 protein kinase phosphorylates Che-1/AATF at Ser316, Ser320, and Ser321 in vitro and in vivo. These phosphorylation events are required for Che-1/histone H3 binding and for Che-1's pro-proliferative activity.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis, 2D gel electrophoresis, mass spectrometry, co-immunoprecipitation, proliferation assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay with mutagenesis and functional rescue; multiple orthogonal methods\",\n      \"pmids\": [\"34266450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AATF/Che-1 localizes to paraspeckles via interaction with the lncRNA NEAT1_2 and directly localizes on R-loops. Depletion of Che-1 produces marked accumulation of RNA:DNA hybrids (R-loops), which triggers sustained activation of an interferon gene expression signature, indicating that Che-1/NEAT1 cooperation prevents excessive inflammatory signaling by facilitating R-loop clearance.\",\n      \"method\": \"Co-immunoprecipitation with NEAT1, R-loop immunoprecipitation (S9.6 antibody), RNA-seq, siRNA, paraspeckle localization imaging\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNA interaction, R-loop accumulation assay, transcriptomic readout; multiple methods, single lab\",\n      \"pmids\": [\"35929179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AATF competitively interacts with nuclear AIF (apoptosis-inducing factor) to inhibit AIF from binding DNA, thereby inhibiting parthanatos in neuronal ischemia-reperfusion models. AATF overexpression reduced infarct volume and neuronal death in a dMCAO/R model.\",\n      \"method\": \"Co-immunoprecipitation, competitive binding assay, DNA fragmentation assay, OGD/R and dMCAO/R models, viral overexpression\",\n      \"journal\": \"Journal of molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — interaction with functional consequence in both in vitro and in vivo models, single lab\",\n      \"pmids\": [\"36058992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AATF interacts with XRCC4 (a core NHEJ subunit), preventing its ubiquitin-mediated proteasomal degradation. Upon DNA damage, ATM phosphorylates AATF at Ser189, causing its dissociation from XRCC4 and enabling rapid XRCC4 recruitment to DNA break sites for efficient NHEJ repair. AATF depletion or expression of phosphorylation-deficient AATF impaired NHEJ and sensitized glioblastoma xenografts to chemoradiotherapy.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, in vitro phosphorylation assay, site-directed mutagenesis, NHEJ assay, xenograft model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — co-IP, ATM kinase assay, mutagenesis, NHEJ functional assay, in vivo model; multiple orthogonal methods\",\n      \"pmids\": [\"40436899\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AATF/Che-1 is a multifunctional nuclear/nucleolar RNA polymerase II-binding protein that: (1) competes with HDAC1 for Rb and Sp1 binding to promote E2F-dependent proliferation and p21-dependent growth arrest; (2) is phosphorylated by ATM/ATR/Chk2 and MK2 upon genotoxic stress, driving nuclear translocation to activate p53/p21 transcription while repressing pro-apoptotic PUMA/BAX/BAK genes; (3) is stabilized by PARP-1-mediated PARylation and destabilized by HIPK2 phosphorylation promoting Pin1/HDM2-dependent ubiquitin-proteasomal degradation; (4) forms a stable ANN complex with NGDN and NOL10 to support 40S ribosomal subunit biogenesis by binding pre-rRNA and RNA polymerase I/UBF; (5) localizes to paraspeckles via NEAT1 lncRNA to resolve R-loops and suppress interferon signaling; (6) protects XRCC4 from degradation and is released from XRCC4 upon ATM-mediated phosphorylation at Ser189 to enable NHEJ DNA repair; and (7) interacts with binding partners including Dlk, Par-4, Tau, c-Jun, and AIF to modulate apoptotic outcomes in diverse stress contexts.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"AATF/Che-1 is a multifunctional nuclear and nucleolar protein that integrates transcriptional regulation, ribosome biogenesis, DNA repair, and R-loop resolution to govern cell proliferation and stress responses. It binds RNA polymerase II, retinoblastoma protein (Rb), and histones, displacing HDAC1 from Rb/E2F complexes, Sp1-containing promoters, and chromatin to activate E2F-dependent proliferation, p21-mediated growth arrest, and global histone acetylation [PMID:12450794, PMID:12847090, PMID:33186461]. Upon genotoxic stress, AATF is phosphorylated by ATM/ATR/Chk2, MK2, and CK2, which drive its nuclear translocation, stabilization, and selective recruitment to p53/p21 promoters while repressing pro-apoptotic targets (PUMA, BAX, BAK), and ATM-mediated Ser189 phosphorylation releases AATF from XRCC4 to enable NHEJ repair [PMID:17157788, PMID:22909821, PMID:40436899]. As a core subunit of the ANN complex (with NGDN and NOL10), AATF binds 45S pre-rRNA near SSU cleavage sites and interacts with RNA polymerase I/UBF to promote 18S rRNA maturation and 40S ribosomal subunit biogenesis, and it localizes to paraspeckles via NEAT1 lncRNA to resolve R-loops and suppress interferon signaling [PMID:27599843, PMID:31363146, PMID:32421830, PMID:35929179].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing AATF as a nuclear phosphoprotein with transactivation capacity that antagonizes kinase-induced apoptosis resolved the initial identity of the gene product and its anti-apoptotic orientation.\",\n      \"evidence\": \"Yeast two-hybrid identification of Dlk/ZIP kinase interaction, Gal4 transactivation assay, and apoptosis interference assay\",\n      \"pmids\": [\"10580117\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dlk interaction validated only by yeast two-hybrid with overexpression follow-up\", \"endogenous relevance of Dlk–AATF axis unresolved\", \"mechanism of apoptosis inhibition undefined\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrating that AATF/Che-1 binds both RNA polymerase II (via hRPB11) and Rb established it as a transcriptional cofactor that modulates Rb-mediated growth suppression and E2F1 transactivation.\",\n      \"evidence\": \"Co-immunoprecipitation, two-hybrid, and transactivation rescue assays\",\n      \"pmids\": [\"10783144\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Rb interaction domains mapped but stoichiometry and in vivo relevance not established\", \"no genome-wide target identification\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showing that Che-1 competes with HDAC1 for the Rb pocket and is recruited to E2F target promoters resolved the mechanism by which AATF promotes cell cycle entry — through derepression of E2F targets via HDAC1 displacement.\",\n      \"evidence\": \"In vitro binding competition, ChIP at E2F promoters, RNAi in pocket-protein-competent cells, cell cycle assay\",\n      \"pmids\": [\"12450794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HDAC1 displacement is the sole mechanism for E2F activation\", \"contribution of other pocket proteins (p107, p130) not dissected\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Extending the HDAC1-displacement mechanism to the p21 promoter via Sp1 showed that AATF drives growth arrest as well as proliferation depending on promoter context, revealing context-dependent transcriptional outcomes.\",\n      \"evidence\": \"ChIP at Sp1 sites on p21 promoter, RNAi, histone acetylation analysis, cell cycle assay in colon carcinoma cells\",\n      \"pmids\": [\"12847090\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AATF is directed to proliferative versus growth-arrest promoters is unclear\", \"Sp1/HDAC1 competition not reconstituted with purified components\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of Par-4 and Tau as AATF-binding partners in neural cells broadened the functional scope of AATF beyond cell cycle control to neuronal apoptosis regulation and Aβ production.\",\n      \"evidence\": \"Co-immunoprecipitation, FRET (for Tau), colocalization, Aβ ELISA (for Par-4) in cerebellar granule neurons and neural cell lines\",\n      \"pmids\": [\"14627703\", \"14697667\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance in neurodegeneration models not tested\", \"downstream signaling mechanisms linking AATF-Par-4 to Aβ production undefined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery that ATM/ATR and Chk2 phosphorylate and stabilize Che-1 upon DNA damage, recruiting it to the p53 and p21 promoters, placed AATF squarely in the DNA damage checkpoint signaling cascade and explained its damage-induced stabilization.\",\n      \"evidence\": \"Kinase assay, co-immunoprecipitation with ATM/ATR/Chk2, ChIP at p53 promoter, siRNA, G2/M checkpoint analysis\",\n      \"pmids\": [\"17157788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation sites mediating each functional outcome not fully mapped\", \"relative contributions of ATM versus ATR not separated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Elucidation of the Pin1/HDM2-dependent degradation pathway showed how apoptotic signals eliminate AATF's anti-apoptotic function, establishing that the balance between kinase-mediated stabilization and Pin1/HDM2-dependent turnover dictates cell fate.\",\n      \"evidence\": \"Co-immunoprecipitation, ubiquitination assay, protein stability assay, Pin1-binding-deficient mutagenesis\",\n      \"pmids\": [\"17468107\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the proline-directed kinase priming Pin1 binding unclear\", \"whether this pathway operates in all cell types not addressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Positioning AATF downstream of the PERK–eIF2α UPR branch as a transcriptional activator of AKT1 via STAT3 revealed a new stress-responsive axis extending AATF's survival function beyond DNA damage to ER stress.\",\n      \"evidence\": \"Gene expression profiling, RNAi epistasis (PERK→AATF→STAT3→AKT1), ER stress cell death assay\",\n      \"pmids\": [\"19911006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding of AATF to AKT1 promoter not shown by ChIP in this study\", \"mechanism of PERK/eIF2α-mediated AATF induction not delineated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of PARP-1-mediated PARylation as an ATM-independent stabilization mechanism for Che-1 added a second post-translational axis controlling AATF protein levels and its promoter occupancy at p21.\",\n      \"evidence\": \"In vitro PARylation assay, PARP-1 knockout cells, PARP inhibition, ChIP at p21 promoter\",\n      \"pmids\": [\"21317046\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sites of PARylation on AATF not mapped\", \"interplay between PARylation and phosphorylation not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstration that MK2 phosphorylates AATF to release it from cytoplasmic MRLC3, enabling nuclear entry and selective repression of pro-apoptotic p53 targets (PUMA, BAX, BAK), resolved how genotoxic stress channels AATF toward anti-apoptotic gene regulation.\",\n      \"evidence\": \"Kinase assay, subcellular fractionation, ChIP at PUMA/BAX/BAK promoters, phospho-mimicking mutagenesis, xenograft model\",\n      \"pmids\": [\"22909821\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of selective repression of pro-apoptotic versus growth-arrest promoters not fully explained\", \"MRLC3 sequestration mechanism not structurally characterized\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing that HIPK2 phosphorylation promotes HDM2-mediated ubiquitination and degradation of Che-1 identified the upstream kinase that primes the degradation switch, complementing the earlier Pin1/HDM2 pathway and establishing a pro-apoptotic kinase–AATF antagonism.\",\n      \"evidence\": \"Kinase assay, ubiquitination assay, siRNA of HIPK2, apoptosis rescue by Che-1 overexpression\",\n      \"pmids\": [\"25210797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between HIPK2 and Pin1 in sequential modification not tested\", \"specific HIPK2 phosphosites and their individual contributions not fully resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"ChIP-seq demonstration that Che-1 forms a ternary complex with p53 and BRCA1 to preferentially activate growth-arrest over pro-apoptotic p53 targets, validated in Che-1+/− mice, provided genome-wide evidence for how AATF biases p53 output toward survival.\",\n      \"evidence\": \"ChIP-seq, co-immunoprecipitation, heterozygous mouse model with ionizing radiation challenge\",\n      \"pmids\": [\"25996291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"BRCA1's structural role in the ternary complex undefined\", \"complete null mouse phenotype not reported\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of the ANN complex (AATF–NGDN–NOL10) and its requirement for 18S rRNA maturation established AATF as a core component of small ribosomal subunit biogenesis, revealing a function independent of its transcriptional activities.\",\n      \"evidence\": \"Immunoprecipitation, domain mapping, siRNA depletion of each component, northern blot rRNA processing assay, nucleolar localization\",\n      \"pmids\": [\"27599843\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymatic activity within the ANN complex not identified\", \"whether ANN complex function is linked to AATF's stress-responsive roles unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"CLIP-seq mapping of AATF RNA-binding sites to 45S pre-rRNA near SSU cleavage regions, combined with a comprehensive mass spectrometry interactome, confirmed direct RNA engagement and connected AATF to a broad rRNA maturation protein network.\",\n      \"evidence\": \"CLIP-seq, mass spectrometry interactome analysis\",\n      \"pmids\": [\"31363146\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of AATF–pre-rRNA complex not determined\", \"RNA-binding domain not delineated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showing that Che-1 occupies the rDNA promoter, interacts with RNA Pol I and UBF, and dynamically relocalizes from rDNA to the p53 promoter upon DNA damage unified AATF's ribosome biogenesis and DNA damage transcription functions as a nucleolar stress sensor.\",\n      \"evidence\": \"ChIP at rDNA promoter, co-immunoprecipitation with Pol I/UBF, rRNA synthesis assay, damage-induced relocalization\",\n      \"pmids\": [\"32421830\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal triggering relocalization from rDNA to p53 promoter not identified\", \"whether Pol I interaction requires the ANN complex unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstration that Che-1 directly binds histones, displaces class I HDACs globally, and sustains histone acetylation — with transgenic Che-1 mice developing multiple myeloma — extended the HDAC-displacement mechanism from promoter-specific to genome-wide and established oncogenic potential in plasma cells.\",\n      \"evidence\": \"Co-immunoprecipitation with histones, histone acetylation assay, transgenic mouse model, siRNA\",\n      \"pmids\": [\"33186461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specificity of histone mark changes not profiled genome-wide\", \"whether CK2 phosphorylation is required for histone binding in vivo not tested in this study\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of CK2 as a kinase phosphorylating Che-1 at Ser316/320/321 to enable histone H3 binding provided the post-translational mechanism controlling AATF's HDAC-displacement and proliferative activity.\",\n      \"evidence\": \"In vitro kinase assay, site-directed mutagenesis, mass spectrometry, co-immunoprecipitation with histone H3, proliferation assay\",\n      \"pmids\": [\"34266450\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CK2 phosphorylation intersects with ATM/MK2 phosphorylation cascades unknown\", \"structural basis for phospho-dependent histone binding not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that AATF localizes to paraspeckles via NEAT1 lncRNA and directly resolves R-loops, with its depletion triggering interferon gene activation, revealed a novel genome-integrity function connecting AATF to innate immune suppression.\",\n      \"evidence\": \"NEAT1 co-immunoprecipitation, S9.6 R-loop immunoprecipitation, RNA-seq, siRNA, paraspeckle imaging\",\n      \"pmids\": [\"35929179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymatic or catalytic mechanism of R-loop resolution by AATF not identified\", \"whether R-loop function depends on the ANN complex or other partners unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Establishing that AATF protects XRCC4 from ubiquitin-mediated degradation and that ATM-mediated Ser189 phosphorylation releases AATF from XRCC4 to permit NHEJ defined a direct DNA repair function and a damage-responsive switch with therapeutic relevance in glioblastoma.\",\n      \"evidence\": \"Co-immunoprecipitation, mass spectrometry, in vitro ATM phosphorylation assay, Ser189 mutagenesis, NHEJ reporter assay, glioblastoma xenograft model\",\n      \"pmids\": [\"40436899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AATF also affects alternative end-joining or homologous recombination\", \"structural basis of AATF–XRCC4 interaction unknown\", \"relationship between Ser189 phosphorylation and other ATM-dependent AATF phosphorylation events not clarified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of AATF's RNA-binding and histone-binding activities, how AATF is coordinately regulated by its multiple kinase inputs (ATM, MK2, CK2, HIPK2) to select between transcriptional programs, and whether its ribosome biogenesis, R-loop resolution, and NHEJ functions are mechanistically interconnected.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of AATF or its complexes available\", \"integrated signaling model for multi-kinase regulation lacking\", \"functional hierarchy among ribosome biogenesis, R-loop resolution, and NHEJ roles not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 3, 7, 13, 17, 23, 24]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [22, 26]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [24, 25]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [6, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 7, 13, 14, 17, 26]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [19, 22, 23]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 3, 7, 17, 23, 24]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [7, 28]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2, 3, 15]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 8, 13, 16, 17]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [19, 22, 23]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [7, 11, 13]}\n    ],\n    \"complexes\": [\n      \"ANN complex (AATF–NGDN–NOL10)\"\n    ],\n    \"partners\": [\n      \"NGDN\",\n      \"NOL10\",\n      \"RB1\",\n      \"TP53\",\n      \"HDAC1\",\n      \"XRCC4\",\n      \"NEAT1\",\n      \"BRCA1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}