{"gene":"CDC25A","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2001,"finding":"IR-induced destruction of CDC25A requires both ATM and Chk2-mediated phosphorylation of CDC25A on serine 123. Loss of CDC25A prevents dephosphorylation of CDK2 and blocks DNA replication, placing the ATM-Chk2-CDC25A-CDK2 pathway as the S-phase checkpoint governing radioresistant DNA synthesis.","method":"IR treatment of cells with ATM/Chk2 mutants; Chk2 phosphorylation of CDC25A-S123 in vitro; dominant-negative Chk2 alleles unable to bind/phosphorylate CDC25A; CDK2-AF rescue experiments","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (in vitro kinase assay, mutant allele analysis, epistasis rescue), replicated across conditions; foundational mechanistic study","pmids":["11298456"],"is_preprint":false},{"year":2000,"finding":"CDC25A is rapidly degraded via the ubiquitin-proteasome pathway in response to UV or ionizing radiation, in a Chk1-dependent but p53-independent manner, resulting in persistent inhibitory tyrosine phosphorylation of CDK2 and S-phase block.","method":"Proteasome inhibitor treatment; immunoblotting for CDC25A degradation; Chk1 inhibition with caffeine; overexpression bypassing checkpoint; cell survival assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods, foundational study replicated by subsequent work","pmids":["10827953"],"is_preprint":false},{"year":2003,"finding":"Beta-TrCP (SCF E3 ubiquitin ligase F-box protein) is the direct E3 ligase that targets phosphorylated CDC25A for proteasomal degradation during S phase and in response to DNA damage. siRNA knockdown of beta-TrCP1/2 stabilizes CDC25A and causes radioresistant DNA synthesis.","method":"siRNA knockdown of beta-TrCP isoforms; co-immunoprecipitation; in vitro ubiquitination assay; radioresistant DNA synthesis assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro ubiquitination reconstitution plus siRNA loss-of-function with defined phenotype, multiple methods","pmids":["14603323"],"is_preprint":false},{"year":2003,"finding":"SCF-beta-TRCP promotes Chk1-dependent CDC25A ubiquitination in vitro, requiring phosphoserine 79 and phosphoserine 82 as a noncanonical phosphodegron for beta-TrCP recognition, with serine 76 as the Chk1 phosphorylation site that primes this cascade.","method":"In vitro ubiquitination reconstitution with SCFbeta-TRCP; phosphosite mutagenesis; siRNA depletion of beta-TRCP; Chk1-dependent assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution, mutagenesis of phosphodegron, siRNA loss-of-function; mechanistically rigorous single study","pmids":["14681206"],"is_preprint":false},{"year":2003,"finding":"Chk1 mediates CDC25A degradation in response to camptothecin and doxorubicin, and CDC25A overexpression abrogates doxorubicin-induced G2 arrest by dephosphorylating and activating CDK1/Cdc2, establishing a role for CDC25A in the G2/M transition.","method":"Chk1 siRNA knockdown; CDC25A overexpression; cell cycle analysis; CDK1 phosphorylation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — siRNA-specific Chk1 depletion, overexpression rescue, CDK1 dephosphorylation assay; single lab, two orthogonal methods","pmids":["12676925"],"is_preprint":false},{"year":2002,"finding":"During mitosis, CDC25A is stabilized by phosphorylation on Ser17 and Ser115 by cyclin B-CDK1, which uncouples it from ubiquitin-proteasome degradation. CDC25A binds and activates cyclin B-CDK1, and its RNAi-mediated downregulation delays mitotic entry.","method":"Mass spectrometry phosphosite identification; cyclin B-CDK1 kinase assay; RNAi knockdown; cell cycle synchronization; overexpression studies","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — MS phosphosite identification, kinase assay, RNAi phenotype, multiple methods in single study","pmids":["12411508"],"is_preprint":false},{"year":2003,"finding":"Chk1 phosphorylates CDC25A on serine 178 and threonine 507, facilitating 14-3-3 binding. Mutation T507A enhanced CDC25A biological activity, increased binding to cyclin B1, activated cyclin B1-CDK1, and promoted premature mitotic entry, indicating a Chk1/CDC25A/14-3-3 pathway preventing premature mitosis.","method":"In vitro Chk1 kinase assay; site-directed mutagenesis; co-immunoprecipitation with 14-3-3; CDK1 activation assays; cell cycle analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro phosphorylation, mutagenesis, co-IP, CDK activation assay; multiple methods single lab","pmids":["14559997"],"is_preprint":false},{"year":2002,"finding":"CDC25A's catalytic mechanism proceeds through a dissociative transition state without a general acid for low leaving group pKa substrates. For high leaving group pKa substrates, glutamic acid 431 is essential for efficient hydrolysis; E431Q mutation abolishes this activity.","method":"Kinetic isotope effects; Brønsted analysis; pH dependence studies with aryl phosphates; site-directed mutagenesis of E431","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — detailed enzymology with KIE, Brønsted analysis, and mutagenesis in single study","pmids":["11805096"],"is_preprint":false},{"year":2009,"finding":"NEK11 kinase is required for DNA damage-induced CDC25A degradation and G2/M arrest. CHK1 directly activates NEK11 by phosphorylating it on Ser273, and NEK11 in turn directly phosphorylates CDC25A on residues required for beta-TrCP-mediated polyubiquitylation and degradation.","method":"shRNA library screen; NEK11 depletion; direct in vitro phosphorylation of CDC25A by NEK11; CHK1 phosphorylation of NEK11; beta-TrCP ubiquitylation assays; G2/M arrest phenotype","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro kinase assays, loss-of-function with defined checkpoint phenotype, identification of phosphosites; multiple orthogonal methods","pmids":["19734889"],"is_preprint":false},{"year":2008,"finding":"GSK-3beta phosphorylates CDC25A to promote its proteasomal degradation during early cell cycle phases. This phosphorylation requires priming of CDC25A by polo-like kinase 3 (Plk3).","method":"In vitro GSK-3beta kinase assay; phosphosite mapping; Plk3 priming assay; proteasome inhibitor rescue; correlation in human tumor tissues","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase reconstitution, priming kinase identification, tumor tissue correlation; multiple methods single lab","pmids":["18167338"],"is_preprint":false},{"year":2010,"finding":"Casein kinase 1 alpha (CK1alpha) phosphorylates CDC25A on S79 and S82 in a hierarchical manner requiring prior phosphorylation of S76 by Chk1 or GSK-3beta. This CK1alpha phosphorylation facilitates beta-TrCP binding and ubiquitin-mediated proteolysis throughout interphase and after genotoxic stress.","method":"In vitro kinase assays; phosphosite mutagenesis; hierarchical phosphorylation reconstitution; beta-TrCP binding assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of hierarchical phosphorylation cascade with mutagenesis; single lab, multiple methods","pmids":["20348946"],"is_preprint":false},{"year":2010,"finding":"Dub3 ubiquitin hydrolase binds CDC25A and removes polyubiquitin modifications that mark it for proteasomal degradation. Dub3 knockdown increases CDC25A ubiquitylation and degradation, reducing CDK/cyclin activity and causing G1/S and G2/M arrest.","method":"Co-immunoprecipitation; ubiquitylation assays; Dub3 siRNA knockdown; cell cycle analysis; NIH-3T3 transformation; xenograft tumor model","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, ubiquitylation assay, siRNA with defined cell cycle phenotype, in vivo xenograft validation; multiple methods","pmids":["20228808"],"is_preprint":false},{"year":2010,"finding":"14-3-3gamma forms a complex with Chk1 phosphorylated at Ser296 (autophosphorylation site), and this ternary complex (14-3-3gamma/Chk1/CDC25A) mediates CDC25A phosphorylation and degradation to block premature mitotic entry after DNA damage.","method":"Co-immunoprecipitation; phospho-specific antibodies; Chk1-S296A mutant replacement; UV irradiation checkpoint assay; ternary complex characterization","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, mutagenesis rescue, checkpoint phenotype; multiple orthogonal methods single lab","pmids":["20639859"],"is_preprint":false},{"year":2004,"finding":"During unperturbed S phase, physiological regulation of the Chk1-CDC25A pathway depends on ATR, Claspin, Rad9, and Hus1. Ablation of ATR inhibits Chk1-dependent phosphorylation of CDC25A and causes CDC25A accumulation without external DNA damage.","method":"Chemical and genetic ATR ablation; siRNA depletion of Claspin, Rad9, Hus1; immunoblotting for CDC25A levels and Chk1-S345 phosphorylation","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and chemical loss-of-function, multiple pathway components, single lab","pmids":["15190204"],"is_preprint":false},{"year":2002,"finding":"CDC25A possesses a cyclin-binding (Cy) motif near its N-terminus that is required for association with cyclin E/A-CDK2. Mutations in this motif disrupt CDC25A-cyclin-CDK2 association and selectively block dephosphorylation of cyclin E-CDK2. p21 competitively disrupts this interaction, and CDC25A protects CDK complexes from p21 inhibition.","method":"In vitro binding assays with mutant CDC25A constructs; co-immunoprecipitation in vivo; p21 competition assays; Xenopus egg extract reconstitution","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro reconstitution, mutagenesis, co-IP, competition assays; single lab, multiple methods","pmids":["9234691"],"is_preprint":false},{"year":2002,"finding":"CDC25A interacts physically and functionally with EGFR in hepatoma cells. CDC25A dephosphorylates tyrosine-phosphorylated EGFR; purified GST-CDC25A and endogenous CDC25A both dephosphorylate EGFR. The interaction requires the EGFR C-terminus and a functional kinase domain.","method":"Co-immunoprecipitation; in vitro phosphatase assay with GST-CDC25A on EGFR; CDC25A inhibitor Cpd5; EGFR mutant constructs","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro dephosphorylation assay, co-IP, inhibitor experiments, domain-mapping; single lab","pmids":["11912208"],"is_preprint":false},{"year":2001,"finding":"CDC25A physically associates with apoptosis signal-regulating kinase 1 (ASK1) in mammalian cells, co-localizing in the cytoplasm. The C-terminus of CDC25A binds ASK1 adjacent to its kinase domain and inhibits ASK1 kinase activity by reducing ASK1 homo-oligomerization, independent of CDC25A phosphatase activity.","method":"Yeast two-hybrid screen; co-immunoprecipitation; confocal immunocytochemistry; inducible transgene expression; ASK1 kinase activity assay; homo-oligomerization assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid, co-IP, confocal colocalization, kinase inhibition assay; multiple methods single lab","pmids":["11416155"],"is_preprint":false},{"year":2005,"finding":"CDC25A physically interacts with and dephosphorylates phospho-ERK both in vitro and in cell culture. Inhibition of CDC25A activity with Cpd5 or siRNA knockdown causes ERK hyper-phosphorylation independent of the EGFR pathway.","method":"Co-immunoprecipitation; in vitro phosphatase assay on phospho-ERK; siRNA knockdown; CDC25A inactive mutant overexpression; EGFR-devoid cell lines","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro dephosphorylation, co-IP, siRNA; single lab, multiple methods","pmids":["15672448"],"is_preprint":false},{"year":2016,"finding":"EGFR activation causes c-Src-mediated phosphorylation of CDC25A at Y59, enabling its interaction with nuclear PKM2. CDC25A then dephosphorylates PKM2 at S37, promoting PKM2-dependent beta-catenin transactivation, c-Myc-upregulated glycolytic gene expression (GLUT1, PKM2, LDHA, CDC25A), creating a positive feedback loop that promotes the Warburg effect.","method":"Co-immunoprecipitation; in vitro dephosphorylation assay of PKM2 by CDC25A; phosphosite mutagenesis; reporter assays; knockdown/overexpression studies; xenograft tumor model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro dephosphorylation of PKM2, co-IP, mutagenesis, reporter assays, in vivo validation; multiple methods single lab","pmids":["27485204"],"is_preprint":false},{"year":2021,"finding":"CDC25A dephosphorylates nuclear PKM2, suppressing autophagy-dependent ferroptosis in cervical cancer cells by upregulating ErbB2 levels through the PKM2-pH3T11-H3K9Ac pathway.","method":"Co-IP; nuclear/cytosolic fractionation; ChIP; dual luciferase assay; siRNA knockdown; xenograft model; cellular ferroptosis assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, fractionation, ChIP, reporter assay; single lab, multiple methods","pmids":["34743185"],"is_preprint":false},{"year":2018,"finding":"CDC25A negatively regulates RIG-I-mediated antiviral signaling by interacting with TBK1 and directly dephosphorylating TBK1 at S172, thereby reducing IRF3 phosphorylation and IFN-beta transcription. This inhibitory effect is dependent on CDC25A phosphatase activity.","method":"Co-immunoprecipitation; in vitro dephosphorylation assay of TBK1-S172 by CDC25A; siRNA knockdown; luciferase reporter assay; VSV/SeV infection assays","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct in vitro dephosphorylation, co-IP, siRNA, reporter assays; multiple orthogonal methods","pmids":["30021902"],"is_preprint":false},{"year":2009,"finding":"In Xenopus eggs, strong ERK activation causes p90RSK-mediated phosphorylation of CDC25A on multiple sites overlapping Chk1 sites, and ERK itself phosphorylates CDC25A, together targeting it for SCF-beta-TrCP-dependent degradation and cell cycle arrest.","method":"In vitro phosphorylation of CDC25A by p90RSK and ERK; SCF-beta-TrCP degradation assay; Xenopus egg system; phosphosite mapping","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assays, reconstituted degradation, Xenopus egg system; single lab","pmids":["19244340"],"is_preprint":false},{"year":2002,"finding":"In Xenopus embryos, Chk1 (but not Cds1/Chk2) is activated at the midblastula transition and is essential for CDC25A degradation and cell cycle elongation. Chk1-induced CDC25A degradation also requires a prior Chk1-independent phosphorylation at Ser73.","method":"Xenopus embryo system; constitutively active Chk1; in vitro phosphorylation; Chk1 inhibition; cell viability assay","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — active kinase, in vitro phosphorylation, embryo genetic epistasis; single lab, ortholog (Xenopus)","pmids":["12110582"],"is_preprint":false},{"year":1999,"finding":"Serum-induced expression of CDC25A is mediated by an E2F site at -62 in the promoter. In serum-starved cells, p130 and p107 (Rb family members) bind E2F at this site to repress transcription; serum induction correlates with inactivation of p107/p130.","method":"Promoter-reporter assays; E2F site mutation; EMSA showing E2F-p107/p130 complex binding; serum induction experiments","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter mutagenesis, EMSA binding, reporter assays; single lab","pmids":["10373518"],"is_preprint":false},{"year":2006,"finding":"p53 downregulates CDC25A transcription in a promoter-dependent manner, without directly binding the CDC25A promoter DNA. This requires a functional p53 but is independent of p53-binding sites; mutant p53, p63, and p73 cannot repress CDC25A transcription.","method":"p53-inducible cell system; qRT-PCR and immunoblotting; promoter-reporter assays; ChIP (negative result for direct binding); p53/p63/p73 comparison","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inducible expression, promoter reporter, ChIP exclusion; single lab, multiple methods","pmids":["17001315"],"is_preprint":false},{"year":2008,"finding":"Dual regulation of CDC25A in DNA damage response occurs at both the protein and transcriptional level: Chk1 promotes rapid protein degradation, while p53-activated ATF3 directly binds the CDC25A promoter to repress transcription. In cells deficient in both Chk1 and p53, CDC25A down-regulation is completely abolished.","method":"siRNA screen for checkpoint kinases; ATF3 ChIP on CDC25A promoter; dual KD of Chk1 and p53; cell cycle and cell death assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, siRNA epistasis, dual KD; single lab, two mechanisms identified","pmids":["19060337"],"is_preprint":false},{"year":2005,"finding":"In cytokine-dependent lymphocytes, cytokine withdrawal activates p38 MAPK, which phosphorylates CDC25A at S75 and S123, inducing its degradation and leaving CDK/cyclin complexes inactive. Expression of CDC25A mutant (S75A/S123A) renders cells resistant to cytokine withdrawal-induced cycle arrest.","method":"p38 MAPK inhibition; phosphosite mutagenesis (S75A, S123A) of CDC25A; cytokine withdrawal assay; CDK activity assay","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation site mutagenesis, p38 inhibitor, cytokine withdrawal phenotype; single lab","pmids":["15928203"],"is_preprint":false},{"year":2008,"finding":"In DNA damage-dependent CDC25A degradation, Chk1 (not Chk2) is the primary kinase phosphorylating Ser-76 required for SCF-beta-TrCP-mediated ubiquitination. Chk2 cannot efficiently phosphorylate Ser-76 and cannot support SCFbeta-TRCP-mediated ubiquitination of CDC25A in vitro. In CHK2-/- cells, CDC25A degradation kinetics are normal, but Chk1 depletion in CHK2-/- cells stabilizes CDC25A.","method":"In vitro kinase assay comparing Chk1 vs Chk2 on Ser-76; in vitro ubiquitination assay; CHK2-/- HCT116 cells; siRNA depletion of Chk1 in CHK2-/- background","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro biochemical reconstitution, isogenic CHK2-/- genetic model, Chk1 siRNA epistasis; multiple methods","pmids":["18480045"],"is_preprint":false},{"year":2017,"finding":"CyclinD-CDK4/CDK6 complexes directly phosphorylate CDC25A on Ser40 during G1. CyclinD1-CDK4 decreases CDC25A stability in a beta-TrCP-dependent manner, with Ser40 and Ser88 phosphorylations contributing. This creates a negative feedback loop controlling the G1/S transition.","method":"In vitro kinase assay of CyclinD-CDK4/6 on CDC25A; phosphosite mutagenesis (Ser40); beta-TrCP dependency; cell cycle synchronization; immunoprecipitation","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay, mutagenesis, beta-TrCP dependency assay; single lab, multiple methods","pmids":["28192398"],"is_preprint":false},{"year":2021,"finding":"DYRK2 kinase phosphorylates CDC25A on at least 7 residues, promoting its ubiquitin/proteasome-mediated degradation independently of known CDC25A E3 ubiquitin ligases. CDC25A in turn controls DYRK2 phosphorylation at residues outside its activation loop, affecting DYRK2 localization and activity, forming a mutual feedback regulatory loop.","method":"In vitro DYRK2 kinase assay; phosphosite identification; ubiquitin-proteasome degradation assays; DYRK2 localization studies; cell cycle and apoptosis assays","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay, phosphosite mapping, degradation assays; single lab, multiple methods","pmids":["34363019"],"is_preprint":false},{"year":2015,"finding":"STK38 (serine-threonine kinase 38) directly phosphorylates CDC25A at Ser-76, and STK38 depletion prevents DNA-damage-induced CDC25A degradation and subsequent G2 arrest.","method":"In vitro kinase assay of STK38 on CDC25A; STK38 siRNA depletion; CDC25A stability assay after DNA damage; G2 arrest measurement","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — direct in vitro kinase assay, siRNA with checkpoint phenotype; single lab","pmids":["25936524"],"is_preprint":false},{"year":2018,"finding":"BRE/BRCC45 facilitates deubiquitylation of CDC25A by recruiting USP7, stabilizing CDC25A in the presence of DNA damage and contributing to cell survival of BRCA2-deficient cells.","method":"Insertional mutagenesis screen; co-immunoprecipitation of BRE-USP7-CDC25A; ubiquitylation assays; cell viability assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, deubiquitylation assay, genetic screen; single lab","pmids":["29416040"],"is_preprint":false},{"year":2005,"finding":"CDC25A shuttles dynamically between nucleus and cytoplasm. Nuclear export is partly mediated by an N-terminal nuclear export sequence (NES) not sensitive to leptomycin B (Exportin 1-independent). A nuclear localization signal (NLS) mutation causes cytoplasmic localization.","method":"FLIP (fluorescence loss in photobleaching); cell fusion assays; NES/NLS mutagenesis; leptomycin B treatment; live-cell imaging with YFP-CDC25A","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell FLIP, FRAP, mutagenesis, inhibitor studies; single lab","pmids":["15572030"],"is_preprint":false},{"year":2013,"finding":"miR-483-3p directly targets the 3'-UTR of CDC25A mRNA, reducing CDC25A levels and increasing inhibitory tyrosine phosphorylation of CDK4/6, which abolishes CDK4/6 association with D-type cyclins and arrests cells in early G1.","method":"Luciferase reporter with CDC25A 3'-UTR; anti-miRNA rescue; CDK4/6 phosphorylation status; cyclin-CDK co-immunoprecipitation; cell cycle synchronization","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR reporter validation, CDK phosphorylation and cyclin association assays; single lab","pmids":["23429262"],"is_preprint":false},{"year":2019,"finding":"Chk1-mediated CDC25A degradation is the primary mechanism by which Chk1 controls normal (unperturbed) cell cycle progression; simultaneous depletion of both Chk1 and CDC25A partially suppresses cell cycle defects caused by Chk1 depletion alone.","method":"CRISPR/Cas9 auxin-inducible degron for endogenous Chk1 depletion; simultaneous Chk1+CDC25A depletion epistasis; DNA damage marker accumulation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — endogenous protein depletion via mAID/CRISPR, epistasis experiment; rigorous genetic approach","pmids":["30635443"],"is_preprint":false},{"year":2011,"finding":"CDC25A enhances Foxo1 stability by dephosphorylating CDK2, and Foxo1 directly regulates MMP1 transcription. CDC25A overexpression in breast cancer cells enhances metastasis, while downmodulation inhibits it in mouse models, independent of proliferation and apoptosis.","method":"CDC25A overexpression/knockdown; Foxo1 stability assays; CDK2 dephosphorylation; MMP1 reporter; mouse metastasis models","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway (CDC25A→CDK2→Foxo1→MMP1), in vivo metastasis model; single lab","pmids":["21670150"],"is_preprint":false},{"year":2008,"finding":"CDC25A controls meiosis I progression in mouse oocytes: it localizes exclusively to the nucleus prior to NEBD, is degraded at metaphase I by a maturation-associated mechanism, and overexpression blocks meiotic maturation at MI with spindle/chromosome defects. RNAi reduction decreases meiosis resumption and MII transition.","method":"GFP-CDC25A microinjection; RNAi; cAMP arrest release; CDK1/MAPK activity assays; immunofluorescence for nuclear localization","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi, GFP localization, overexpression with kinase activity readout; single lab","pmids":["18367163"],"is_preprint":false},{"year":1997,"finding":"TGF-beta represses CDC25A expression to cause inhibitory tyrosine phosphorylation and inactivation of CDK4 and CDK6 in a human mammary epithelial cell line, independent of its induction of p15INK4B.","method":"CDC25A mRNA/protein expression analysis after TGF-beta treatment; CDK4/6 tyrosine phosphorylation assays; epistasis between p15 induction and CDC25A repression","journal":"Nature","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — expression repression with kinase phosphorylation readout, epistasis analysis; single lab","pmids":["9163429"],"is_preprint":false},{"year":2017,"finding":"NPAS2 (a circadian transcription factor) heterodimerizes with BMAL1 and binds E-box elements in the CDC25A promoter to transcriptionally upregulate CDC25A, leading to CDK2/4/6 and Bcl-2 dephosphorylation and promoting hepatocellular carcinoma cell survival.","method":"ChIP assay; CDC25A promoter-reporter assay; NPAS2/BMAL1 co-immunoprecipitation; siRNA knockdown; xenograft model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, reporter assay, co-IP, loss-of-function; single lab","pmids":["28333141"],"is_preprint":false},{"year":2012,"finding":"FOXM1 directly regulates CDC25A gene transcription via promoter binding and indirect E2F-dependent pathways. CDC25A phosphatase activity enhances FOXM1 transcriptional activity synergistically through CDK1-mediated phosphorylation of FOXM1 at T600, T611, T620. A novel protein interaction between FOXM1 C-terminus and CDC25A is demonstrated.","method":"CDC25A promoter-reporter assay; FOXM1 ChIP; co-immunoprecipitation of FOXM1-CDC25A; phosphorylation mutagenesis (T600A, T611A); FOXM1 transcriptional activity assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, co-IP, mutagenesis, reporter assays; single lab","pmids":["23240008"],"is_preprint":false},{"year":2021,"finding":"CDK2/cyclin A mediates feedback inhibition of CDC25A by phosphorylating S88 in a CDK consensus sequence, preventing CDC25A over-activation in early S phase. CDK complexes with cyclin B (and possibly cyclin E) stabilize CDC25A in a feed-forward loop.","method":"CDK2 inhibition; cyclin A suppression; S88 phosphorylation analysis; CDC25A stability assays; CHK1 inhibitor experiments","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacologic CDK inhibition, CDK consensus phosphosite, feedback loop characterization; single lab","pmids":["34156324"],"is_preprint":false},{"year":2022,"finding":"SRSF10 promotes exon 6 skipping in CDC25A pre-mRNA, producing a truncated isoform CDC25A(ΔE6) that lacks two ubiquitination sites (Lys150, Lys169) in exon 6, rendering it more stable and nucleus-retained. Additionally, SRSF10 activates CDC25A through Ser178 dephosphorylation causing nuclear retention.","method":"RNA immunoprecipitation and CLIP-qPCR; RNA sequencing for AS events; co-immunoprecipitation; immunofluorescence; western blotting; in vitro and in vivo HCC models","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CLIP, co-IP, isoform characterization, in vivo validation; single lab, multiple methods","pmids":["36539837"],"is_preprint":false},{"year":2013,"finding":"SMG-1 kinase phosphorylates CDC25A as a substrate; cells depleted of SMG-1 show prolonged CDC25A stability and fail to inactivate CDK2 in response to radiation, linking SMG-1 to G1/S checkpoint via CDC25A.","method":"SMG-1 depletion; CDC25A stability assays after irradiation; CDK2 inactivation assay; tumor growth experiments","journal":"Cell cycle","confidence":"Low","confidence_rationale":"Tier 3 / Weak — SMG-1 identified as CDC25A kinase but primarily through stability/depletion assays without direct in vitro kinase assay described in abstract","pmids":["24107632"],"is_preprint":false},{"year":2012,"finding":"Rock2 directly binds CDC25A (co-IP, immunofluorescence colocalization) and regulates CDC25A ubiquitination and degradation. Rock2 knockdown promotes CDC25A ubiquitination and its degradation, causing G1/S arrest.","method":"Co-immunoprecipitation; immunofluorescence; Rock2 siRNA; ubiquitination assay; cell cycle analysis","journal":"Experimental cell research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — co-IP and co-localization with functional siRNA data; single lab, limited mechanistic depth","pmids":["22705122"],"is_preprint":false},{"year":2011,"finding":"JAK2(V617F) upregulates CDC25A at the translational level through STAT5 and the translational initiation factor eIF2alpha, without increasing CDC25A transcription or protein stability or upstream Akt/MAPK involvement.","method":"Jak2(V617F) knock-in mouse model; JAK2(V617F) cell lines; quantitative PCR for transcription; protein stability assays; STAT5 inhibition; eIF2alpha pathway analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knock-in model, dissection of transcription vs. translation vs. stability, STAT5/eIF2alpha pathway; single lab","pmids":["22065597"],"is_preprint":false}],"current_model":"CDC25A is a dual-specificity phosphatase that activates CDKs (CDK2, CDK4/6, CDK1) by dephosphorylating inhibitory phosphotyrosine/phosphothreonine residues to drive G1/S and G2/M cell cycle transitions; its protein levels are tightly controlled by a multi-kinase phosphorylation cascade (ATR-Chk1/Chk2, GSK-3β primed by Plk3, CK1α, p90RSK/ERK, NEK11 activated by Chk1, DYRK2, STK38, CyclinD-CDK4/6) that generates phosphodegrons recognized by SCF-β-TrCP for ubiquitin-proteasome degradation, which is counteracted by deubiquitylases Dub3 and USP7 (recruited by BRE); beyond cell-cycle CDKs, CDC25A also dephosphorylates EGFR, ERK, PKM2, and TBK1, linking it to mitogenic signaling, metabolic reprogramming (Warburg effect via PKM2), and innate immune regulation; transcriptionally, CDC25A is activated by E2F/p107/p130 relief by serum, by Myc and FOXM1/NPAS2-BMAL1 and YBX1, and repressed by p53 (via ATF3 and indirect mechanisms) and TGF-β; subcellularly, CDC25A shuttles between nucleus and cytoplasm via defined NLS/NES sequences, and its cytoplasmic localization in cancer can shift its function toward anti-apoptotic interactions with 14-3-3 and Akt/Raf1."},"narrative":{"mechanistic_narrative":"CDC25A is a dual-specificity phosphatase that drives cell-cycle progression by dephosphorylating and activating cyclin-dependent kinase complexes at successive transitions: it binds cyclin E/A-CDK2 through an N-terminal cyclin-binding (Cy) motif and removes inhibitory phosphorylation to license S-phase entry [PMID:9234691], dephosphorylates CDK1/Cdc2 to permit the G2/M transition [PMID:12676925], and binds and activates cyclin B-CDK1 during mitosis [PMID:12411508]. Its catalysis proceeds through a dissociative transition state, with glutamate 431 essential for hydrolysis of high-leaving-group substrates [PMID:11805096]. The dominant layer of control over CDC25A is regulated proteolysis: in response to DNA damage or during unperturbed S phase, the ATR-Claspin-Rad9-Hus1 axis activates Chk1 [PMID:15190204], which—together with Chk2 after ionizing radiation [PMID:11298456]—triggers ubiquitin-proteasome destruction of CDC25A to enforce the S-phase and G2/M checkpoints and block radioresistant DNA synthesis [PMID:10827953, PMID:30635443]. Degradation is executed by the SCF-β-TrCP E3 ligase, which recognizes a noncanonical phosphodegron built hierarchically: Chk1 (and GSK-3β) phosphorylate the priming Ser76, enabling CK1α phosphorylation of Ser79/Ser82 for β-TrCP binding [PMID:14681206, PMID:20348946, PMID:18480045], with additional kinases (NEK11, activated by Chk1; GSK-3β primed by Plk3; p90RSK/ERK; STK38; CDK4/6; DYRK2) feeding into this destruction program [PMID:19734889, PMID:18167338, PMID:19244340, PMID:28192398, PMID:25936524]. Opposing degradation, the deubiquitylases Dub3 and USP7 (recruited by BRE/BRCC45) stabilize CDC25A [PMID:20228808, PMID:29416040]. Transcriptionally, CDC25A is induced through an E2F site relieved of p107/p130 repression by serum [PMID:10373518] and is repressed by p53 acting indirectly via ATF3 [PMID:17001315, PMID:19060337] and by TGF-β [PMID:9163429]. Beyond cell-cycle CDKs, CDC25A dephosphorylates additional substrates that extend its reach into mitogenic and metabolic signaling—EGFR and ERK [PMID:11912208, PMID:15672448], nuclear PKM2 to promote the Warburg effect [PMID:27485204], and TBK1 at Ser172 to dampen RIG-I antiviral interferon signaling [PMID:30021902].","teleology":[{"year":2000,"claim":"Established that genotoxic stress eliminates CDC25A through regulated proteolysis rather than transcriptional shutdown, defining the molecular basis of the S-phase checkpoint.","evidence":"Proteasome inhibition and Chk1 inhibition during UV/IR in cultured cells, with overexpression bypassing the checkpoint","pmids":["10827953"],"confidence":"High","gaps":["Did not identify the E3 ligase or the phosphodegron","p53-independence shown but upstream kinase cascade not yet resolved"]},{"year":2001,"claim":"Resolved the upstream checkpoint kinases for IR, showing ATM and Chk2 phosphorylate CDC25A on Ser123 to halt replication, placing CDC25A as the effector of the radioresistant-DNA-synthesis checkpoint.","evidence":"ATM/Chk2 mutant cells, in vitro Chk2 phosphorylation of S123, dominant-negative Chk2, and CDK2-AF rescue","pmids":["11298456"],"confidence":"High","gaps":["Relationship between Chk2/S123 and the later-defined Chk1/Ser76 degron unresolved","Did not reconstitute ubiquitination"]},{"year":2002,"claim":"Defined the substrate-recognition and catalytic basis of CDC25A activity—an N-terminal Cy motif for cyclin-CDK2 engagement and a dissociative catalytic mechanism with E431—and showed mitotic stabilization couples it to cyclin B-CDK1.","evidence":"Mutant binding/co-IP and Xenopus extract reconstitution (Cy motif); kinetic isotope effects and Brønsted analysis (catalysis); MS phosphosite mapping and RNAi (mitotic role)","pmids":["9234691","11805096","12411508"],"confidence":"High","gaps":["Structural model of phosphodegron-β-TrCP interaction not addressed","How Cy-motif selectivity is regulated across cell cycle unclear"]},{"year":2003,"claim":"Identified SCF-β-TrCP as the direct E3 ligase and mapped the noncanonical Ser79/Ser82 phosphodegron primed at Ser76 by Chk1, mechanistically completing the degradation pathway and extending CDC25A control to the G2/M transition.","evidence":"In vitro ubiquitination reconstitution, β-TrCP siRNA with radioresistant DNA synthesis, phosphodegron mutagenesis, and Chk1 siRNA with CDK1 dephosphorylation assays","pmids":["14603323","14681206","12676925"],"confidence":"High","gaps":["Did not enumerate all priming kinases feeding Ser76","Counteracting deubiquitylation not yet defined"]},{"year":2004,"claim":"Demonstrated the Chk1-CDC25A circuit operates during unperturbed S phase under ATR/Claspin/Rad9/Hus1 control, not only after exogenous damage, defining a physiological surveillance role.","evidence":"Chemical/genetic ATR ablation and siRNA of Claspin, Rad9, Hus1 with CDC25A and Chk1-S345 immunoblotting","pmids":["15190204"],"confidence":"Medium","gaps":["Quantitative contribution of each component not separated","Link to replication origin firing not addressed"]},{"year":2008,"claim":"Expanded the kinase network priming the degron (GSK-3β via Plk3; CK1α building Ser79/82 hierarchically on Ser76) and showed Chk1, not Chk2, is the principal Ser76 kinase for damage-induced degradation, with a parallel transcriptional arm via p53-ATF3.","evidence":"In vitro kinase reconstitutions, hierarchical phosphorylation, isogenic CHK2-/- cells with Chk1 siRNA epistasis, and ATF3 ChIP on the CDC25A promoter","pmids":["18167338","20348946","18480045","19060337"],"confidence":"High","gaps":["Spatiotemporal coordination of the multi-kinase cascade not resolved","p53 represses without direct promoter binding, exact bridging factor beyond ATF3 unclear"]},{"year":2009,"claim":"Identified NEK11 as a Chk1-activated kinase that directly phosphorylates CDC25A to enable β-TrCP-mediated ubiquitylation, and showed ERK/p90RSK can route CDC25A to the same degradation machinery, broadening checkpoint and mitogenic inputs.","evidence":"shRNA screen, in vitro Chk1->NEK11->CDC25A phosphorylation cascade, β-TrCP ubiquitylation assays; Xenopus p90RSK/ERK phosphorylation and reconstituted degradation","pmids":["19734889","19244340"],"confidence":"High","gaps":["Relative dominance of NEK11 vs direct Chk1 phosphorylation in vivo unclear","p90RSK route shown in Xenopus, mammalian contribution not quantified"]},{"year":2010,"claim":"Defined the deubiquitylation arm and the scaffolded checkpoint complex—Dub3 reverses CDC25A polyubiquitylation, while a 14-3-3γ/Chk1(pS296)/CDC25A ternary complex couples Chk1 autophosphorylation to CDC25A degradation.","evidence":"Co-IP, ubiquitylation assays, Dub3 siRNA with cell-cycle arrest and xenograft validation; phospho-specific antibodies and Chk1-S296A rescue for the ternary complex","pmids":["20228808","20639859"],"confidence":"High","gaps":["How Dub3 activity is itself regulated unknown","Whether USP7 and Dub3 act on distinct ubiquitin pools unresolved"]},{"year":2018,"claim":"Extended CDC25A substrate repertoire beyond CDKs to innate immunity, showing it dephosphorylates TBK1-S172 to suppress IRF3 activation and IFN-β, and identified BRE/USP7 as a stabilizing module relevant to BRCA2-deficient survival.","evidence":"In vitro dephosphorylation of TBK1-S172, co-IP, siRNA, IFN-β reporters and viral infection; insertional mutagenesis screen and BRE-USP7-CDC25A co-IP","pmids":["30021902","29416040"],"confidence":"High","gaps":["Physiological conditions selecting TBK1 vs CDK substrates unclear","How BRE/USP7 recruitment is signaled not defined"]},{"year":2021,"claim":"Identified DYRK2 as an E3-ligase-independent route to CDC25A degradation forming a mutual feedback loop, and confirmed via endogenous-degron epistasis that Chk1's main role in normal cycling is to limit CDC25A.","evidence":"In vitro DYRK2 kinase and phosphosite mapping with proteasomal degradation assays; CRISPR/auxin-degron Chk1 depletion with Chk1+CDC25A double-depletion epistasis","pmids":["34363019","30635443"],"confidence":"Medium","gaps":["E3 ligase mediating DYRK2-driven degradation not identified","Generality of feedback loop across tissues untested"]},{"year":null,"claim":"How the many parallel kinase inputs, deubiquitylases, and non-CDK substrates are integrated to set CDC25A activity in a given cellular and metabolic context remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified quantitative model integrating the kinase/DUB network","Substrate-selection switch between cell-cycle CDKs and EGFR/ERK/PKM2/TBK1 unknown","Structural basis of phosphodegron recognition not determined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,14,15,17,18,20]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,5,14]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[32,36]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[16,32]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,1,4,5,14]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,1,8,13]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[41]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[20]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[18]}],"complexes":["SCF-β-TrCP (substrate)","14-3-3γ/Chk1/CDC25A ternary complex","cyclin E/A-CDK2","cyclin B-CDK1"],"partners":["BTRC","CHEK1","NEK11","CDK2","CDK1","PKM2","TBK1","USP7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P30304","full_name":"M-phase inducer phosphatase 1","aliases":["Dual specificity phosphatase Cdc25A"],"length_aa":524,"mass_kda":59.1,"function":"Tyrosine protein phosphatase which functions as a dosage-dependent inducer of mitotic progression (PubMed:12676925, PubMed:14559997, PubMed:1836978, PubMed:20360007). Directly dephosphorylates CDK1 and stimulates its kinase activity (PubMed:20360007). Also dephosphorylates CDK2 in complex with cyclin-E, in vitro (PubMed:20360007)","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P30304/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CDC25A","classification":"Not Classified","n_dependent_lines":226,"n_total_lines":1208,"dependency_fraction":0.1870860927152318},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CDC25A","total_profiled":1310},"omim":[{"mim_id":"621175","title":"LYSINE-RICH COILED-COIL PROTEIN 1; KRCC1","url":"https://www.omim.org/entry/621175"},{"mim_id":"620694","title":"TUBULIN TYROSINE LIGASE-LIKE 11; TTLL11","url":"https://www.omim.org/entry/620694"},{"mim_id":"620335","title":"CELL DIVISION CYCLE 20B; CDC20B","url":"https://www.omim.org/entry/620335"},{"mim_id":"614532","title":"RASGEF DOMAIN FAMILY, MEMBER 1B; RASGEF1B","url":"https://www.omim.org/entry/614532"},{"mim_id":"613132","title":"MICRO RNA 449B; MIR449B","url":"https://www.omim.org/entry/613132"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"bone marrow","ntpm":14.4},{"tissue":"lymphoid tissue","ntpm":8.2},{"tissue":"testis","ntpm":12.4}],"url":"https://www.proteinatlas.org/search/CDC25A"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P30304","domains":[{"cath_id":"3.40.250.10","chopping":"334-492","consensus_level":"high","plddt":95.5423,"start":334,"end":492},{"cath_id":"-","chopping":"494-524","consensus_level":"medium","plddt":74.8477,"start":494,"end":524}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P30304","model_url":"https://alphafold.ebi.ac.uk/files/AF-P30304-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P30304-F1-predicted_aligned_error_v6.png","plddt_mean":63.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CDC25A","jax_strain_url":"https://www.jax.org/strain/search?query=CDC25A"},"sequence":{"accession":"P30304","fasta_url":"https://rest.uniprot.org/uniprotkb/P30304.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P30304/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P30304"}},"corpus_meta":[{"pmid":"11298456","id":"PMC_11298456","title":"The 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Medical sciences = Hua zhong ke ji da xue xue bao. Yi xue Ying De wen ban = Huazhong keji daxue xuebao. 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cdc25B phosphatase in breast carcinoma.","date":"2004","source":"Breast cancer (Tokyo, Japan)","url":"https://pubmed.ncbi.nlm.nih.gov/15550849","citation_count":29,"is_preprint":false},{"pmid":"29552180","id":"PMC_29552180","title":"SIRT6 inhibits colorectal cancer stem cell proliferation by targeting CDC25A.","date":"2018","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/29552180","citation_count":29,"is_preprint":false},{"pmid":"12085185","id":"PMC_12085185","title":"Expression of cdc25A and cdc25B proteins in thyroid neoplasms.","date":"2002","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/12085185","citation_count":29,"is_preprint":false},{"pmid":"20217459","id":"PMC_20217459","title":"CDC25A mRNA levels significantly correlate with Ki-67 expression in human glioma samples.","date":"2010","source":"Journal of 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standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"IR-induced destruction of CDC25A requires both ATM and Chk2-mediated phosphorylation of CDC25A on serine 123. Loss of CDC25A prevents dephosphorylation of CDK2 and blocks DNA replication, placing the ATM-Chk2-CDC25A-CDK2 pathway as the S-phase checkpoint governing radioresistant DNA synthesis.\",\n      \"method\": \"IR treatment of cells with ATM/Chk2 mutants; Chk2 phosphorylation of CDC25A-S123 in vitro; dominant-negative Chk2 alleles unable to bind/phosphorylate CDC25A; CDK2-AF rescue experiments\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (in vitro kinase assay, mutant allele analysis, epistasis rescue), replicated across conditions; foundational mechanistic study\",\n      \"pmids\": [\"11298456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CDC25A is rapidly degraded via the ubiquitin-proteasome pathway in response to UV or ionizing radiation, in a Chk1-dependent but p53-independent manner, resulting in persistent inhibitory tyrosine phosphorylation of CDK2 and S-phase block.\",\n      \"method\": \"Proteasome inhibitor treatment; immunoblotting for CDC25A degradation; Chk1 inhibition with caffeine; overexpression bypassing checkpoint; cell survival assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods, foundational study replicated by subsequent work\",\n      \"pmids\": [\"10827953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Beta-TrCP (SCF E3 ubiquitin ligase F-box protein) is the direct E3 ligase that targets phosphorylated CDC25A for proteasomal degradation during S phase and in response to DNA damage. siRNA knockdown of beta-TrCP1/2 stabilizes CDC25A and causes radioresistant DNA synthesis.\",\n      \"method\": \"siRNA knockdown of beta-TrCP isoforms; co-immunoprecipitation; in vitro ubiquitination assay; radioresistant DNA synthesis assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro ubiquitination reconstitution plus siRNA loss-of-function with defined phenotype, multiple methods\",\n      \"pmids\": [\"14603323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SCF-beta-TRCP promotes Chk1-dependent CDC25A ubiquitination in vitro, requiring phosphoserine 79 and phosphoserine 82 as a noncanonical phosphodegron for beta-TrCP recognition, with serine 76 as the Chk1 phosphorylation site that primes this cascade.\",\n      \"method\": \"In vitro ubiquitination reconstitution with SCFbeta-TRCP; phosphosite mutagenesis; siRNA depletion of beta-TRCP; Chk1-dependent assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution, mutagenesis of phosphodegron, siRNA loss-of-function; mechanistically rigorous single study\",\n      \"pmids\": [\"14681206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Chk1 mediates CDC25A degradation in response to camptothecin and doxorubicin, and CDC25A overexpression abrogates doxorubicin-induced G2 arrest by dephosphorylating and activating CDK1/Cdc2, establishing a role for CDC25A in the G2/M transition.\",\n      \"method\": \"Chk1 siRNA knockdown; CDC25A overexpression; cell cycle analysis; CDK1 phosphorylation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA-specific Chk1 depletion, overexpression rescue, CDK1 dephosphorylation assay; single lab, two orthogonal methods\",\n      \"pmids\": [\"12676925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"During mitosis, CDC25A is stabilized by phosphorylation on Ser17 and Ser115 by cyclin B-CDK1, which uncouples it from ubiquitin-proteasome degradation. CDC25A binds and activates cyclin B-CDK1, and its RNAi-mediated downregulation delays mitotic entry.\",\n      \"method\": \"Mass spectrometry phosphosite identification; cyclin B-CDK1 kinase assay; RNAi knockdown; cell cycle synchronization; overexpression studies\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — MS phosphosite identification, kinase assay, RNAi phenotype, multiple methods in single study\",\n      \"pmids\": [\"12411508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Chk1 phosphorylates CDC25A on serine 178 and threonine 507, facilitating 14-3-3 binding. Mutation T507A enhanced CDC25A biological activity, increased binding to cyclin B1, activated cyclin B1-CDK1, and promoted premature mitotic entry, indicating a Chk1/CDC25A/14-3-3 pathway preventing premature mitosis.\",\n      \"method\": \"In vitro Chk1 kinase assay; site-directed mutagenesis; co-immunoprecipitation with 14-3-3; CDK1 activation assays; cell cycle analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro phosphorylation, mutagenesis, co-IP, CDK activation assay; multiple methods single lab\",\n      \"pmids\": [\"14559997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CDC25A's catalytic mechanism proceeds through a dissociative transition state without a general acid for low leaving group pKa substrates. For high leaving group pKa substrates, glutamic acid 431 is essential for efficient hydrolysis; E431Q mutation abolishes this activity.\",\n      \"method\": \"Kinetic isotope effects; Brønsted analysis; pH dependence studies with aryl phosphates; site-directed mutagenesis of E431\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — detailed enzymology with KIE, Brønsted analysis, and mutagenesis in single study\",\n      \"pmids\": [\"11805096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NEK11 kinase is required for DNA damage-induced CDC25A degradation and G2/M arrest. CHK1 directly activates NEK11 by phosphorylating it on Ser273, and NEK11 in turn directly phosphorylates CDC25A on residues required for beta-TrCP-mediated polyubiquitylation and degradation.\",\n      \"method\": \"shRNA library screen; NEK11 depletion; direct in vitro phosphorylation of CDC25A by NEK11; CHK1 phosphorylation of NEK11; beta-TrCP ubiquitylation assays; G2/M arrest phenotype\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro kinase assays, loss-of-function with defined checkpoint phenotype, identification of phosphosites; multiple orthogonal methods\",\n      \"pmids\": [\"19734889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"GSK-3beta phosphorylates CDC25A to promote its proteasomal degradation during early cell cycle phases. This phosphorylation requires priming of CDC25A by polo-like kinase 3 (Plk3).\",\n      \"method\": \"In vitro GSK-3beta kinase assay; phosphosite mapping; Plk3 priming assay; proteasome inhibitor rescue; correlation in human tumor tissues\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase reconstitution, priming kinase identification, tumor tissue correlation; multiple methods single lab\",\n      \"pmids\": [\"18167338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Casein kinase 1 alpha (CK1alpha) phosphorylates CDC25A on S79 and S82 in a hierarchical manner requiring prior phosphorylation of S76 by Chk1 or GSK-3beta. This CK1alpha phosphorylation facilitates beta-TrCP binding and ubiquitin-mediated proteolysis throughout interphase and after genotoxic stress.\",\n      \"method\": \"In vitro kinase assays; phosphosite mutagenesis; hierarchical phosphorylation reconstitution; beta-TrCP binding assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of hierarchical phosphorylation cascade with mutagenesis; single lab, multiple methods\",\n      \"pmids\": [\"20348946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Dub3 ubiquitin hydrolase binds CDC25A and removes polyubiquitin modifications that mark it for proteasomal degradation. Dub3 knockdown increases CDC25A ubiquitylation and degradation, reducing CDK/cyclin activity and causing G1/S and G2/M arrest.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitylation assays; Dub3 siRNA knockdown; cell cycle analysis; NIH-3T3 transformation; xenograft tumor model\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, ubiquitylation assay, siRNA with defined cell cycle phenotype, in vivo xenograft validation; multiple methods\",\n      \"pmids\": [\"20228808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"14-3-3gamma forms a complex with Chk1 phosphorylated at Ser296 (autophosphorylation site), and this ternary complex (14-3-3gamma/Chk1/CDC25A) mediates CDC25A phosphorylation and degradation to block premature mitotic entry after DNA damage.\",\n      \"method\": \"Co-immunoprecipitation; phospho-specific antibodies; Chk1-S296A mutant replacement; UV irradiation checkpoint assay; ternary complex characterization\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, mutagenesis rescue, checkpoint phenotype; multiple orthogonal methods single lab\",\n      \"pmids\": [\"20639859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"During unperturbed S phase, physiological regulation of the Chk1-CDC25A pathway depends on ATR, Claspin, Rad9, and Hus1. Ablation of ATR inhibits Chk1-dependent phosphorylation of CDC25A and causes CDC25A accumulation without external DNA damage.\",\n      \"method\": \"Chemical and genetic ATR ablation; siRNA depletion of Claspin, Rad9, Hus1; immunoblotting for CDC25A levels and Chk1-S345 phosphorylation\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and chemical loss-of-function, multiple pathway components, single lab\",\n      \"pmids\": [\"15190204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CDC25A possesses a cyclin-binding (Cy) motif near its N-terminus that is required for association with cyclin E/A-CDK2. Mutations in this motif disrupt CDC25A-cyclin-CDK2 association and selectively block dephosphorylation of cyclin E-CDK2. p21 competitively disrupts this interaction, and CDC25A protects CDK complexes from p21 inhibition.\",\n      \"method\": \"In vitro binding assays with mutant CDC25A constructs; co-immunoprecipitation in vivo; p21 competition assays; Xenopus egg extract reconstitution\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro reconstitution, mutagenesis, co-IP, competition assays; single lab, multiple methods\",\n      \"pmids\": [\"9234691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CDC25A interacts physically and functionally with EGFR in hepatoma cells. CDC25A dephosphorylates tyrosine-phosphorylated EGFR; purified GST-CDC25A and endogenous CDC25A both dephosphorylate EGFR. The interaction requires the EGFR C-terminus and a functional kinase domain.\",\n      \"method\": \"Co-immunoprecipitation; in vitro phosphatase assay with GST-CDC25A on EGFR; CDC25A inhibitor Cpd5; EGFR mutant constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro dephosphorylation assay, co-IP, inhibitor experiments, domain-mapping; single lab\",\n      \"pmids\": [\"11912208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CDC25A physically associates with apoptosis signal-regulating kinase 1 (ASK1) in mammalian cells, co-localizing in the cytoplasm. The C-terminus of CDC25A binds ASK1 adjacent to its kinase domain and inhibits ASK1 kinase activity by reducing ASK1 homo-oligomerization, independent of CDC25A phosphatase activity.\",\n      \"method\": \"Yeast two-hybrid screen; co-immunoprecipitation; confocal immunocytochemistry; inducible transgene expression; ASK1 kinase activity assay; homo-oligomerization assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid, co-IP, confocal colocalization, kinase inhibition assay; multiple methods single lab\",\n      \"pmids\": [\"11416155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CDC25A physically interacts with and dephosphorylates phospho-ERK both in vitro and in cell culture. Inhibition of CDC25A activity with Cpd5 or siRNA knockdown causes ERK hyper-phosphorylation independent of the EGFR pathway.\",\n      \"method\": \"Co-immunoprecipitation; in vitro phosphatase assay on phospho-ERK; siRNA knockdown; CDC25A inactive mutant overexpression; EGFR-devoid cell lines\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro dephosphorylation, co-IP, siRNA; single lab, multiple methods\",\n      \"pmids\": [\"15672448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"EGFR activation causes c-Src-mediated phosphorylation of CDC25A at Y59, enabling its interaction with nuclear PKM2. CDC25A then dephosphorylates PKM2 at S37, promoting PKM2-dependent beta-catenin transactivation, c-Myc-upregulated glycolytic gene expression (GLUT1, PKM2, LDHA, CDC25A), creating a positive feedback loop that promotes the Warburg effect.\",\n      \"method\": \"Co-immunoprecipitation; in vitro dephosphorylation assay of PKM2 by CDC25A; phosphosite mutagenesis; reporter assays; knockdown/overexpression studies; xenograft tumor model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro dephosphorylation of PKM2, co-IP, mutagenesis, reporter assays, in vivo validation; multiple methods single lab\",\n      \"pmids\": [\"27485204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CDC25A dephosphorylates nuclear PKM2, suppressing autophagy-dependent ferroptosis in cervical cancer cells by upregulating ErbB2 levels through the PKM2-pH3T11-H3K9Ac pathway.\",\n      \"method\": \"Co-IP; nuclear/cytosolic fractionation; ChIP; dual luciferase assay; siRNA knockdown; xenograft model; cellular ferroptosis assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, fractionation, ChIP, reporter assay; single lab, multiple methods\",\n      \"pmids\": [\"34743185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CDC25A negatively regulates RIG-I-mediated antiviral signaling by interacting with TBK1 and directly dephosphorylating TBK1 at S172, thereby reducing IRF3 phosphorylation and IFN-beta transcription. This inhibitory effect is dependent on CDC25A phosphatase activity.\",\n      \"method\": \"Co-immunoprecipitation; in vitro dephosphorylation assay of TBK1-S172 by CDC25A; siRNA knockdown; luciferase reporter assay; VSV/SeV infection assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct in vitro dephosphorylation, co-IP, siRNA, reporter assays; multiple orthogonal methods\",\n      \"pmids\": [\"30021902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Xenopus eggs, strong ERK activation causes p90RSK-mediated phosphorylation of CDC25A on multiple sites overlapping Chk1 sites, and ERK itself phosphorylates CDC25A, together targeting it for SCF-beta-TrCP-dependent degradation and cell cycle arrest.\",\n      \"method\": \"In vitro phosphorylation of CDC25A by p90RSK and ERK; SCF-beta-TrCP degradation assay; Xenopus egg system; phosphosite mapping\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assays, reconstituted degradation, Xenopus egg system; single lab\",\n      \"pmids\": [\"19244340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"In Xenopus embryos, Chk1 (but not Cds1/Chk2) is activated at the midblastula transition and is essential for CDC25A degradation and cell cycle elongation. Chk1-induced CDC25A degradation also requires a prior Chk1-independent phosphorylation at Ser73.\",\n      \"method\": \"Xenopus embryo system; constitutively active Chk1; in vitro phosphorylation; Chk1 inhibition; cell viability assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — active kinase, in vitro phosphorylation, embryo genetic epistasis; single lab, ortholog (Xenopus)\",\n      \"pmids\": [\"12110582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Serum-induced expression of CDC25A is mediated by an E2F site at -62 in the promoter. In serum-starved cells, p130 and p107 (Rb family members) bind E2F at this site to repress transcription; serum induction correlates with inactivation of p107/p130.\",\n      \"method\": \"Promoter-reporter assays; E2F site mutation; EMSA showing E2F-p107/p130 complex binding; serum induction experiments\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter mutagenesis, EMSA binding, reporter assays; single lab\",\n      \"pmids\": [\"10373518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"p53 downregulates CDC25A transcription in a promoter-dependent manner, without directly binding the CDC25A promoter DNA. This requires a functional p53 but is independent of p53-binding sites; mutant p53, p63, and p73 cannot repress CDC25A transcription.\",\n      \"method\": \"p53-inducible cell system; qRT-PCR and immunoblotting; promoter-reporter assays; ChIP (negative result for direct binding); p53/p63/p73 comparison\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible expression, promoter reporter, ChIP exclusion; single lab, multiple methods\",\n      \"pmids\": [\"17001315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Dual regulation of CDC25A in DNA damage response occurs at both the protein and transcriptional level: Chk1 promotes rapid protein degradation, while p53-activated ATF3 directly binds the CDC25A promoter to repress transcription. In cells deficient in both Chk1 and p53, CDC25A down-regulation is completely abolished.\",\n      \"method\": \"siRNA screen for checkpoint kinases; ATF3 ChIP on CDC25A promoter; dual KD of Chk1 and p53; cell cycle and cell death assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, siRNA epistasis, dual KD; single lab, two mechanisms identified\",\n      \"pmids\": [\"19060337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In cytokine-dependent lymphocytes, cytokine withdrawal activates p38 MAPK, which phosphorylates CDC25A at S75 and S123, inducing its degradation and leaving CDK/cyclin complexes inactive. Expression of CDC25A mutant (S75A/S123A) renders cells resistant to cytokine withdrawal-induced cycle arrest.\",\n      \"method\": \"p38 MAPK inhibition; phosphosite mutagenesis (S75A, S123A) of CDC25A; cytokine withdrawal assay; CDK activity assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site mutagenesis, p38 inhibitor, cytokine withdrawal phenotype; single lab\",\n      \"pmids\": [\"15928203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In DNA damage-dependent CDC25A degradation, Chk1 (not Chk2) is the primary kinase phosphorylating Ser-76 required for SCF-beta-TrCP-mediated ubiquitination. Chk2 cannot efficiently phosphorylate Ser-76 and cannot support SCFbeta-TRCP-mediated ubiquitination of CDC25A in vitro. In CHK2-/- cells, CDC25A degradation kinetics are normal, but Chk1 depletion in CHK2-/- cells stabilizes CDC25A.\",\n      \"method\": \"In vitro kinase assay comparing Chk1 vs Chk2 on Ser-76; in vitro ubiquitination assay; CHK2-/- HCT116 cells; siRNA depletion of Chk1 in CHK2-/- background\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro biochemical reconstitution, isogenic CHK2-/- genetic model, Chk1 siRNA epistasis; multiple methods\",\n      \"pmids\": [\"18480045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CyclinD-CDK4/CDK6 complexes directly phosphorylate CDC25A on Ser40 during G1. CyclinD1-CDK4 decreases CDC25A stability in a beta-TrCP-dependent manner, with Ser40 and Ser88 phosphorylations contributing. This creates a negative feedback loop controlling the G1/S transition.\",\n      \"method\": \"In vitro kinase assay of CyclinD-CDK4/6 on CDC25A; phosphosite mutagenesis (Ser40); beta-TrCP dependency; cell cycle synchronization; immunoprecipitation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay, mutagenesis, beta-TrCP dependency assay; single lab, multiple methods\",\n      \"pmids\": [\"28192398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DYRK2 kinase phosphorylates CDC25A on at least 7 residues, promoting its ubiquitin/proteasome-mediated degradation independently of known CDC25A E3 ubiquitin ligases. CDC25A in turn controls DYRK2 phosphorylation at residues outside its activation loop, affecting DYRK2 localization and activity, forming a mutual feedback regulatory loop.\",\n      \"method\": \"In vitro DYRK2 kinase assay; phosphosite identification; ubiquitin-proteasome degradation assays; DYRK2 localization studies; cell cycle and apoptosis assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay, phosphosite mapping, degradation assays; single lab, multiple methods\",\n      \"pmids\": [\"34363019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"STK38 (serine-threonine kinase 38) directly phosphorylates CDC25A at Ser-76, and STK38 depletion prevents DNA-damage-induced CDC25A degradation and subsequent G2 arrest.\",\n      \"method\": \"In vitro kinase assay of STK38 on CDC25A; STK38 siRNA depletion; CDC25A stability assay after DNA damage; G2 arrest measurement\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct in vitro kinase assay, siRNA with checkpoint phenotype; single lab\",\n      \"pmids\": [\"25936524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BRE/BRCC45 facilitates deubiquitylation of CDC25A by recruiting USP7, stabilizing CDC25A in the presence of DNA damage and contributing to cell survival of BRCA2-deficient cells.\",\n      \"method\": \"Insertional mutagenesis screen; co-immunoprecipitation of BRE-USP7-CDC25A; ubiquitylation assays; cell viability assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, deubiquitylation assay, genetic screen; single lab\",\n      \"pmids\": [\"29416040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CDC25A shuttles dynamically between nucleus and cytoplasm. Nuclear export is partly mediated by an N-terminal nuclear export sequence (NES) not sensitive to leptomycin B (Exportin 1-independent). A nuclear localization signal (NLS) mutation causes cytoplasmic localization.\",\n      \"method\": \"FLIP (fluorescence loss in photobleaching); cell fusion assays; NES/NLS mutagenesis; leptomycin B treatment; live-cell imaging with YFP-CDC25A\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell FLIP, FRAP, mutagenesis, inhibitor studies; single lab\",\n      \"pmids\": [\"15572030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"miR-483-3p directly targets the 3'-UTR of CDC25A mRNA, reducing CDC25A levels and increasing inhibitory tyrosine phosphorylation of CDK4/6, which abolishes CDK4/6 association with D-type cyclins and arrests cells in early G1.\",\n      \"method\": \"Luciferase reporter with CDC25A 3'-UTR; anti-miRNA rescue; CDK4/6 phosphorylation status; cyclin-CDK co-immunoprecipitation; cell cycle synchronization\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR reporter validation, CDK phosphorylation and cyclin association assays; single lab\",\n      \"pmids\": [\"23429262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Chk1-mediated CDC25A degradation is the primary mechanism by which Chk1 controls normal (unperturbed) cell cycle progression; simultaneous depletion of both Chk1 and CDC25A partially suppresses cell cycle defects caused by Chk1 depletion alone.\",\n      \"method\": \"CRISPR/Cas9 auxin-inducible degron for endogenous Chk1 depletion; simultaneous Chk1+CDC25A depletion epistasis; DNA damage marker accumulation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — endogenous protein depletion via mAID/CRISPR, epistasis experiment; rigorous genetic approach\",\n      \"pmids\": [\"30635443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CDC25A enhances Foxo1 stability by dephosphorylating CDK2, and Foxo1 directly regulates MMP1 transcription. CDC25A overexpression in breast cancer cells enhances metastasis, while downmodulation inhibits it in mouse models, independent of proliferation and apoptosis.\",\n      \"method\": \"CDC25A overexpression/knockdown; Foxo1 stability assays; CDK2 dephosphorylation; MMP1 reporter; mouse metastasis models\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway (CDC25A→CDK2→Foxo1→MMP1), in vivo metastasis model; single lab\",\n      \"pmids\": [\"21670150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CDC25A controls meiosis I progression in mouse oocytes: it localizes exclusively to the nucleus prior to NEBD, is degraded at metaphase I by a maturation-associated mechanism, and overexpression blocks meiotic maturation at MI with spindle/chromosome defects. RNAi reduction decreases meiosis resumption and MII transition.\",\n      \"method\": \"GFP-CDC25A microinjection; RNAi; cAMP arrest release; CDK1/MAPK activity assays; immunofluorescence for nuclear localization\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi, GFP localization, overexpression with kinase activity readout; single lab\",\n      \"pmids\": [\"18367163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"TGF-beta represses CDC25A expression to cause inhibitory tyrosine phosphorylation and inactivation of CDK4 and CDK6 in a human mammary epithelial cell line, independent of its induction of p15INK4B.\",\n      \"method\": \"CDC25A mRNA/protein expression analysis after TGF-beta treatment; CDK4/6 tyrosine phosphorylation assays; epistasis between p15 induction and CDC25A repression\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — expression repression with kinase phosphorylation readout, epistasis analysis; single lab\",\n      \"pmids\": [\"9163429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NPAS2 (a circadian transcription factor) heterodimerizes with BMAL1 and binds E-box elements in the CDC25A promoter to transcriptionally upregulate CDC25A, leading to CDK2/4/6 and Bcl-2 dephosphorylation and promoting hepatocellular carcinoma cell survival.\",\n      \"method\": \"ChIP assay; CDC25A promoter-reporter assay; NPAS2/BMAL1 co-immunoprecipitation; siRNA knockdown; xenograft model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, reporter assay, co-IP, loss-of-function; single lab\",\n      \"pmids\": [\"28333141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"FOXM1 directly regulates CDC25A gene transcription via promoter binding and indirect E2F-dependent pathways. CDC25A phosphatase activity enhances FOXM1 transcriptional activity synergistically through CDK1-mediated phosphorylation of FOXM1 at T600, T611, T620. A novel protein interaction between FOXM1 C-terminus and CDC25A is demonstrated.\",\n      \"method\": \"CDC25A promoter-reporter assay; FOXM1 ChIP; co-immunoprecipitation of FOXM1-CDC25A; phosphorylation mutagenesis (T600A, T611A); FOXM1 transcriptional activity assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, co-IP, mutagenesis, reporter assays; single lab\",\n      \"pmids\": [\"23240008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CDK2/cyclin A mediates feedback inhibition of CDC25A by phosphorylating S88 in a CDK consensus sequence, preventing CDC25A over-activation in early S phase. CDK complexes with cyclin B (and possibly cyclin E) stabilize CDC25A in a feed-forward loop.\",\n      \"method\": \"CDK2 inhibition; cyclin A suppression; S88 phosphorylation analysis; CDC25A stability assays; CHK1 inhibitor experiments\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacologic CDK inhibition, CDK consensus phosphosite, feedback loop characterization; single lab\",\n      \"pmids\": [\"34156324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SRSF10 promotes exon 6 skipping in CDC25A pre-mRNA, producing a truncated isoform CDC25A(ΔE6) that lacks two ubiquitination sites (Lys150, Lys169) in exon 6, rendering it more stable and nucleus-retained. Additionally, SRSF10 activates CDC25A through Ser178 dephosphorylation causing nuclear retention.\",\n      \"method\": \"RNA immunoprecipitation and CLIP-qPCR; RNA sequencing for AS events; co-immunoprecipitation; immunofluorescence; western blotting; in vitro and in vivo HCC models\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CLIP, co-IP, isoform characterization, in vivo validation; single lab, multiple methods\",\n      \"pmids\": [\"36539837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SMG-1 kinase phosphorylates CDC25A as a substrate; cells depleted of SMG-1 show prolonged CDC25A stability and fail to inactivate CDK2 in response to radiation, linking SMG-1 to G1/S checkpoint via CDC25A.\",\n      \"method\": \"SMG-1 depletion; CDC25A stability assays after irradiation; CDK2 inactivation assay; tumor growth experiments\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — SMG-1 identified as CDC25A kinase but primarily through stability/depletion assays without direct in vitro kinase assay described in abstract\",\n      \"pmids\": [\"24107632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rock2 directly binds CDC25A (co-IP, immunofluorescence colocalization) and regulates CDC25A ubiquitination and degradation. Rock2 knockdown promotes CDC25A ubiquitination and its degradation, causing G1/S arrest.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence; Rock2 siRNA; ubiquitination assay; cell cycle analysis\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — co-IP and co-localization with functional siRNA data; single lab, limited mechanistic depth\",\n      \"pmids\": [\"22705122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"JAK2(V617F) upregulates CDC25A at the translational level through STAT5 and the translational initiation factor eIF2alpha, without increasing CDC25A transcription or protein stability or upstream Akt/MAPK involvement.\",\n      \"method\": \"Jak2(V617F) knock-in mouse model; JAK2(V617F) cell lines; quantitative PCR for transcription; protein stability assays; STAT5 inhibition; eIF2alpha pathway analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knock-in model, dissection of transcription vs. translation vs. stability, STAT5/eIF2alpha pathway; single lab\",\n      \"pmids\": [\"22065597\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDC25A is a dual-specificity phosphatase that activates CDKs (CDK2, CDK4/6, CDK1) by dephosphorylating inhibitory phosphotyrosine/phosphothreonine residues to drive G1/S and G2/M cell cycle transitions; its protein levels are tightly controlled by a multi-kinase phosphorylation cascade (ATR-Chk1/Chk2, GSK-3β primed by Plk3, CK1α, p90RSK/ERK, NEK11 activated by Chk1, DYRK2, STK38, CyclinD-CDK4/6) that generates phosphodegrons recognized by SCF-β-TrCP for ubiquitin-proteasome degradation, which is counteracted by deubiquitylases Dub3 and USP7 (recruited by BRE); beyond cell-cycle CDKs, CDC25A also dephosphorylates EGFR, ERK, PKM2, and TBK1, linking it to mitogenic signaling, metabolic reprogramming (Warburg effect via PKM2), and innate immune regulation; transcriptionally, CDC25A is activated by E2F/p107/p130 relief by serum, by Myc and FOXM1/NPAS2-BMAL1 and YBX1, and repressed by p53 (via ATF3 and indirect mechanisms) and TGF-β; subcellularly, CDC25A shuttles between nucleus and cytoplasm via defined NLS/NES sequences, and its cytoplasmic localization in cancer can shift its function toward anti-apoptotic interactions with 14-3-3 and Akt/Raf1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDC25A is a dual-specificity phosphatase that drives cell-cycle progression by dephosphorylating and activating cyclin-dependent kinase complexes at successive transitions: it binds cyclin E/A-CDK2 through an N-terminal cyclin-binding (Cy) motif and removes inhibitory phosphorylation to license S-phase entry [#14], dephosphorylates CDK1/Cdc2 to permit the G2/M transition [#4], and binds and activates cyclin B-CDK1 during mitosis [#5]. Its catalysis proceeds through a dissociative transition state, with glutamate 431 essential for hydrolysis of high-leaving-group substrates [#7]. The dominant layer of control over CDC25A is regulated proteolysis: in response to DNA damage or during unperturbed S phase, the ATR-Claspin-Rad9-Hus1 axis activates Chk1 [#13], which—together with Chk2 after ionizing radiation [#0]—triggers ubiquitin-proteasome destruction of CDC25A to enforce the S-phase and G2/M checkpoints and block radioresistant DNA synthesis [#1, #34]. Degradation is executed by the SCF-\\u03b2-TrCP E3 ligase, which recognizes a noncanonical phosphodegron built hierarchically: Chk1 (and GSK-3\\u03b2) phosphorylate the priming Ser76, enabling CK1\\u03b1 phosphorylation of Ser79/Ser82 for \\u03b2-TrCP binding [#3, #10, #27], with additional kinases (NEK11, activated by Chk1; GSK-3\\u03b2 primed by Plk3; p90RSK/ERK; STK38; CDK4/6; DYRK2) feeding into this destruction program [#8, #9, #21, #28, #30]. Opposing degradation, the deubiquitylases Dub3 and USP7 (recruited by BRE/BRCC45) stabilize CDC25A [#11, #31]. Transcriptionally, CDC25A is induced through an E2F site relieved of p107/p130 repression by serum [#23] and is repressed by p53 acting indirectly via ATF3 [#24, #25] and by TGF-\\u03b2 [#37]. Beyond cell-cycle CDKs, CDC25A dephosphorylates additional substrates that extend its reach into mitogenic and metabolic signaling—EGFR and ERK [#15, #17], nuclear PKM2 to promote the Warburg effect [#18], and TBK1 at Ser172 to dampen RIG-I antiviral interferon signaling [#20].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that genotoxic stress eliminates CDC25A through regulated proteolysis rather than transcriptional shutdown, defining the molecular basis of the S-phase checkpoint.\",\n      \"evidence\": \"Proteasome inhibition and Chk1 inhibition during UV/IR in cultured cells, with overexpression bypassing the checkpoint\",\n      \"pmids\": [\"10827953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the E3 ligase or the phosphodegron\", \"p53-independence shown but upstream kinase cascade not yet resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Resolved the upstream checkpoint kinases for IR, showing ATM and Chk2 phosphorylate CDC25A on Ser123 to halt replication, placing CDC25A as the effector of the radioresistant-DNA-synthesis checkpoint.\",\n      \"evidence\": \"ATM/Chk2 mutant cells, in vitro Chk2 phosphorylation of S123, dominant-negative Chk2, and CDK2-AF rescue\",\n      \"pmids\": [\"11298456\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between Chk2/S123 and the later-defined Chk1/Ser76 degron unresolved\", \"Did not reconstitute ubiquitination\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the substrate-recognition and catalytic basis of CDC25A activity—an N-terminal Cy motif for cyclin-CDK2 engagement and a dissociative catalytic mechanism with E431—and showed mitotic stabilization couples it to cyclin B-CDK1.\",\n      \"evidence\": \"Mutant binding/co-IP and Xenopus extract reconstitution (Cy motif); kinetic isotope effects and Br\\u00f8nsted analysis (catalysis); MS phosphosite mapping and RNAi (mitotic role)\",\n      \"pmids\": [\"9234691\", \"11805096\", \"12411508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural model of phosphodegron-\\u03b2-TrCP interaction not addressed\", \"How Cy-motif selectivity is regulated across cell cycle unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified SCF-\\u03b2-TrCP as the direct E3 ligase and mapped the noncanonical Ser79/Ser82 phosphodegron primed at Ser76 by Chk1, mechanistically completing the degradation pathway and extending CDC25A control to the G2/M transition.\",\n      \"evidence\": \"In vitro ubiquitination reconstitution, \\u03b2-TrCP siRNA with radioresistant DNA synthesis, phosphodegron mutagenesis, and Chk1 siRNA with CDK1 dephosphorylation assays\",\n      \"pmids\": [\"14603323\", \"14681206\", \"12676925\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not enumerate all priming kinases feeding Ser76\", \"Counteracting deubiquitylation not yet defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated the Chk1-CDC25A circuit operates during unperturbed S phase under ATR/Claspin/Rad9/Hus1 control, not only after exogenous damage, defining a physiological surveillance role.\",\n      \"evidence\": \"Chemical/genetic ATR ablation and siRNA of Claspin, Rad9, Hus1 with CDC25A and Chk1-S345 immunoblotting\",\n      \"pmids\": [\"15190204\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of each component not separated\", \"Link to replication origin firing not addressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Expanded the kinase network priming the degron (GSK-3\\u03b2 via Plk3; CK1\\u03b1 building Ser79/82 hierarchically on Ser76) and showed Chk1, not Chk2, is the principal Ser76 kinase for damage-induced degradation, with a parallel transcriptional arm via p53-ATF3.\",\n      \"evidence\": \"In vitro kinase reconstitutions, hierarchical phosphorylation, isogenic CHK2-/- cells with Chk1 siRNA epistasis, and ATF3 ChIP on the CDC25A promoter\",\n      \"pmids\": [\"18167338\", \"20348946\", \"18480045\", \"19060337\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatiotemporal coordination of the multi-kinase cascade not resolved\", \"p53 represses without direct promoter binding, exact bridging factor beyond ATF3 unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified NEK11 as a Chk1-activated kinase that directly phosphorylates CDC25A to enable \\u03b2-TrCP-mediated ubiquitylation, and showed ERK/p90RSK can route CDC25A to the same degradation machinery, broadening checkpoint and mitogenic inputs.\",\n      \"evidence\": \"shRNA screen, in vitro Chk1->NEK11->CDC25A phosphorylation cascade, \\u03b2-TrCP ubiquitylation assays; Xenopus p90RSK/ERK phosphorylation and reconstituted degradation\",\n      \"pmids\": [\"19734889\", \"19244340\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative dominance of NEK11 vs direct Chk1 phosphorylation in vivo unclear\", \"p90RSK route shown in Xenopus, mammalian contribution not quantified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the deubiquitylation arm and the scaffolded checkpoint complex—Dub3 reverses CDC25A polyubiquitylation, while a 14-3-3\\u03b3/Chk1(pS296)/CDC25A ternary complex couples Chk1 autophosphorylation to CDC25A degradation.\",\n      \"evidence\": \"Co-IP, ubiquitylation assays, Dub3 siRNA with cell-cycle arrest and xenograft validation; phospho-specific antibodies and Chk1-S296A rescue for the ternary complex\",\n      \"pmids\": [\"20228808\", \"20639859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Dub3 activity is itself regulated unknown\", \"Whether USP7 and Dub3 act on distinct ubiquitin pools unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extended CDC25A substrate repertoire beyond CDKs to innate immunity, showing it dephosphorylates TBK1-S172 to suppress IRF3 activation and IFN-\\u03b2, and identified BRE/USP7 as a stabilizing module relevant to BRCA2-deficient survival.\",\n      \"evidence\": \"In vitro dephosphorylation of TBK1-S172, co-IP, siRNA, IFN-\\u03b2 reporters and viral infection; insertional mutagenesis screen and BRE-USP7-CDC25A co-IP\",\n      \"pmids\": [\"30021902\", \"29416040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological conditions selecting TBK1 vs CDK substrates unclear\", \"How BRE/USP7 recruitment is signaled not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified DYRK2 as an E3-ligase-independent route to CDC25A degradation forming a mutual feedback loop, and confirmed via endogenous-degron epistasis that Chk1's main role in normal cycling is to limit CDC25A.\",\n      \"evidence\": \"In vitro DYRK2 kinase and phosphosite mapping with proteasomal degradation assays; CRISPR/auxin-degron Chk1 depletion with Chk1+CDC25A double-depletion epistasis\",\n      \"pmids\": [\"34363019\", \"30635443\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase mediating DYRK2-driven degradation not identified\", \"Generality of feedback loop across tissues untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many parallel kinase inputs, deubiquitylases, and non-CDK substrates are integrated to set CDC25A activity in a given cellular and metabolic context remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified quantitative model integrating the kinase/DUB network\", \"Substrate-selection switch between cell-cycle CDKs and EGFR/ERK/PKM2/TBK1 unknown\", \"Structural basis of phosphodegron recognition not determined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 14, 15, 17, 18, 20]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 5, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [32, 36]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [16, 32]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1, 4, 5, 14]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 1, 8, 13]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [41]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"complexes\": [\"SCF-\\u03b2-TrCP (substrate)\", \"14-3-3\\u03b3/Chk1/CDC25A ternary complex\", \"cyclin E/A-CDK2\", \"cyclin B-CDK1\"],\n    \"partners\": [\"BTRC\", \"CHEK1\", \"NEK11\", \"CDK2\", \"CDK1\", \"PKM2\", \"TBK1\", \"USP7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}