{"gene":"CDC25B","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1993,"finding":"Human CDC25B phosphatase dephosphorylates both Thr-14 and Tyr-15 of CDK1 (p34cdc2) in vitro, but not Thr-161, establishing it as a dual-specificity activating phosphatase for the mitotic kinase.","method":"In vitro dephosphorylation assay with purified CDC25B and CDK1","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro biochemical assay establishing substrate specificity; foundational result consistent with all subsequent literature","pmids":["8440392"],"is_preprint":false},{"year":1996,"finding":"CDC25B catalytic domain uses a two-step phosphoenzyme intermediate mechanism (formation and breakdown of phospho-cysteine intermediate) characteristic of dual-specificity phosphatases; rate constants for enzyme phosphorylation (~26 s⁻¹) and dephosphorylation (~1.5 s⁻¹) were determined by pre-steady-state kinetics.","method":"Pre-steady-state kinetic analysis using OMFP substrate with purified recombinant CDC25B catalytic domain","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — rigorous in vitro kinetic reconstitution with pre-steady-state burst analysis, replicated mechanistic framework","pmids":["8910325"],"is_preprint":false},{"year":1997,"finding":"Alternative splicing of CDC25B produces at least three variants (CDC25B1, B2, B3) that differ in activity; in fission yeast complementation assays CDC25B2 > CDC25B3 > CDC25B1 in mitosis-inducing activity, suggesting splice variation controls cell proliferation.","method":"cDNA cloning, genomic sequencing, in vitro phosphatase assay, episomal expression in S. pombe complementation assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional complementation in yeast plus in vitro activity assays; activity differences confirmed by orthogonal methods in one lab","pmids":["9188863"],"is_preprint":false},{"year":1997,"finding":"CDC25B is degraded by the proteasome in a manner dependent on phosphorylation by CDK1-cyclin A but not CDK1-cyclin B, identifying CDK1-cyclin A as a writer that targets CDC25B for proteasomal destruction at the G2/M transition.","method":"In vitro phosphorylation assays, proteasome inhibitor treatment, in vivo degradation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay combined with in vivo proteasome inhibitor experiments; isoform-specificity (cyclin A vs. B) established with orthogonal methods","pmids":["9407044"],"is_preprint":false},{"year":1998,"finding":"Ablation of CDC25B function by microinjection of specific antibodies blocks entry into mitosis in Hs68 cells, but does not affect later stages of mitosis or initiation of DNA replication. CDC25B activity peaks during G2, and is activated by phosphorylation during S-phase both in vitro and in vivo, supporting its role as a 'starter phosphatase' for mitosis.","method":"Microinjection of neutralizing antibodies, cell cycle synchronization, kinase/phosphatase activity assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — microinjection loss-of-function combined with in vitro and in vivo biochemical assays; independently replicated concept","pmids":["9683638"],"is_preprint":false},{"year":1999,"finding":"Overexpression of CDC25B, but not CDC25C, causes S-phase and G2-phase cells to enter mitosis prematurely, overriding the unreplicated-DNA checkpoint. CDC25B is cytoplasmic during S and G2 phases due to nuclear export, and this nuclear export is dependent on cyclin B1, establishing a distinct localization and checkpoint behavior compared to CDC25C.","method":"Time-lapse fluorescence microscopy, microinjection of expression constructs, cell synchronization, GFP-chimera imaging","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — live-cell imaging with functional readouts and domain mutants in synchronized cells; multiple orthogonal methods in one study","pmids":["10444066"],"is_preprint":false},{"year":2000,"finding":"CDC25B contains a nuclear localization signal (residues 335–354) and a nuclear export sequence (residues 28–40). Interaction with 14-3-3 proteins via Ser-323 is required for cytoplasmic retention; mutation of Ser-323 or treatment with the exportin inhibitor leptomycin B retains CDC25B in the nucleus, demonstrating regulated nucleo-cytoplasmic shuttling.","method":"Transfection of HA-tagged deletion/truncation/point-mutant constructs, leptomycin B treatment, subcellular fractionation/immunofluorescence","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Moderate — systematic deletion mapping and pharmacological inhibition, multiple orthogonal methods; replicated by later studies","pmids":["10822367"],"is_preprint":false},{"year":2000,"finding":"CDC25B interacts with 14-3-3 proteins; in two-hybrid assays all three CDC25B splice variants bind 14-3-3η, β, and ζ but poorly bind ε and θ. Interaction requires the integrity of Ser-323 but is independent of phosphorylation, unlike CDC25C, and a high-affinity site for 14-3-3ζ/η is exposed by N-terminal truncation.","method":"Two-hybrid assay, in vitro binding assays, phosphorylation/dephosphorylation experiments, deletion constructs","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — two-hybrid plus in vitro binding; interaction characteristics replicated in subsequent studies but phosphorylation-independence was single-lab finding","pmids":["10713667"],"is_preprint":false},{"year":2000,"finding":"The catalytic acid required for protonation of the leaving group in CDC25B phosphatase activity resides on the protein substrate (CDK2-pTpY/CycA) rather than within the known structure of CDC25B; neither Glu474 nor Glu478, previously proposed, is responsible for the observed pH dependence observed with the natural substrate.","method":"pH-dependent kinetic analysis, site-directed mutagenesis, truncation experiments with small-molecule and natural substrates","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous kinetics and mutagenesis but single lab; result is a negative finding regarding proposed residues combined with a positive finding for substrate-provided catalytic acid","pmids":["10978163"],"is_preprint":false},{"year":2001,"finding":"14-3-3 binding to Ser-323 of CDC25B directly inhibits its phosphatase activity by blocking substrate (cyclin/CDK) access to the catalytic site; mutation of Ser-323 or removal of the N-terminal regulatory domain strongly activates CDC25B and enables bypass of the G2 checkpoint, providing mechanistic evidence that 14-3-3 controls CDC25B activity.","method":"Cell-based overexpression and checkpoint bypass assays, phosphatase activity assays with 14-3-3 binding mutants","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional checkpoint bypass combined with in vitro activity measurement and structure-function mutation analysis","pmids":["11466620"],"is_preprint":false},{"year":2001,"finding":"CDC25B acts as a coactivator for steroid receptors (including the androgen receptor and estrogen receptor) in a hormone-dependent manner, independent of its phosphatase catalytic activity. CDC25B directly interacts with steroid receptors (demonstrated by GST-pulldown and mammalian two-hybrid assays) and synergizes with CBP and p300/PCAF coactivators.","method":"Transient transfection reporter assays, cell-free assay with chromatin templates, GST-pulldown, mammalian two-hybrid","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical methods (GST-pulldown, two-hybrid, chromatin template assay, reporter assay) demonstrating phosphatase-independent interaction and coactivation","pmids":["11689696"],"is_preprint":false},{"year":2002,"finding":"Cdc25b is essential for resumption of meiosis in female mice; Cdc25b-/- oocytes remain permanently arrested at prophase with low MPF (CDK1/cyclin B) activity. Microinjection of wild-type Cdc25b mRNA restores MPF activation and meiotic resumption, establishing Cdc25b as the indispensable activator of CDK1 for meiotic entry.","method":"Gene-targeted knockout mice (Cdc25b-/-), mRNA microinjection rescue, MPF activity assay","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined sterility phenotype, rescued by mRNA injection, multiple orthogonal validations; replicated in concept by subsequent studies","pmids":["11912493"],"is_preprint":false},{"year":2002,"finding":"The kinase pEg3 (PAR-1/MARK family) specifically phosphorylates CDC25B in vitro on Ser-323 and associates with CDC25B in vitro and in vivo; ectopic expression of active pEg3 causes G2 accumulation that is counteracted by CDC25B overexpression, placing pEg3 as an antagonistic regulator of CDC25B at G2/M.","method":"In vitro kinase assay, co-immunoprecipitation, ectopic expression in U2OS cells, cell cycle analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay plus co-IP plus epistasis by overexpression; single lab","pmids":["12400006"],"is_preprint":false},{"year":2003,"finding":"Protein kinase CK2 phosphorylates CDC25B in vitro on Ser-186 and Ser-187 (identified by mass spectrometry), interacts with CDC25B via the CK2β subunit (residues 1–55 of CK2β binding residues 122–200 of CDC25B), and phosphorylation by CK2 increases CDC25B catalytic activity both in vitro and in vivo.","method":"In vitro kinase assay, mass spectrometry, co-immunoprecipitation, phosphatase activity assay in Sf9 and U2OS cells","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mass spectrometry identification of sites, in vitro assay, in vivo co-IP and activity measurement; multiple orthogonal methods","pmids":["12527891"],"is_preprint":false},{"year":2003,"finding":"14-3-3 acts as an intramolecular bridge in CDC25B: Ser-151 and Ser-230 in the N-terminal domain are functional low-affinity 14-3-3 binding sites that cooperate with the high-affinity Ser-323 site to form a bridge constraining CDC25B structure and blocking catalytic site access and nuclear export sequence access.","method":"Mutagenesis of 14-3-3 binding sites, cell-based localization and activity assays, deletion constructs","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutagenesis combined with functional assays; single lab but multiple sites mapped","pmids":["12764136"],"is_preprint":false},{"year":2003,"finding":"PKB/Akt phosphorylates CDC25B on Ser-353, resulting in nuclear export-dependent cytoplasmic accumulation; oxidative stress activates PKB/Akt and reproduces this effect on CDC25B phosphorylation and localization.","method":"In vitro kinase assay, mutagenesis (S353A), subcellular fractionation and immunofluorescence, oxidative stress treatment","journal":"Biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay plus in vivo localization analysis with point mutant; single lab","pmids":["14630392"],"is_preprint":false},{"year":2004,"finding":"Aurora-A kinase phosphorylates CDC25B on Ser-353 both in vitro and in vivo at the centrosome; this phosphorylated form localizes to centrosomes during mitosis, and microinjection of anti-phospho-S353 antibodies causes mitotic delay while a S353 phosphomimetic mutant enhances mitotic entry, demonstrating Aurora-A–CDC25B centrosomal signaling contributes to the G2-M transition.","method":"In vitro kinase assay, RNAi knockdown, immunofluorescence, microinjection of phospho-specific antibodies, overexpression of phosphomimetic mutant","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay, RNAi epistasis, antibody microinjection, and phosphomimetic mutant; replicated by two independent publications (PMID 15128871 and 16082213)","pmids":["15128871","16082213"],"is_preprint":false},{"year":2004,"finding":"14-3-3β binding to Ser-309 (not Ser-216 or Ser-137) of CDC25B is sufficient to drive CDC25B to the cytoplasm; 14-3-3ε shares this behavior, while 14-3-3σ binds preferentially at Ser-216 but does not alter CDC25B localization, demonstrating isoform-selective 14-3-3 binding controls CDC25B subcellular distribution.","method":"Site-directed mutagenesis, co-expression of FLAG-tagged CDC25B with various 14-3-3 isoforms, immunofluorescence","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutagenesis with immunofluorescence readout; single lab but multiple isoforms and sites tested","pmids":["15173315"],"is_preprint":false},{"year":2004,"finding":"Endogenous CDC25B is mainly nuclear but a fraction is cytoplasmic during G2; a nuclear export sequence (NES) at amino acids 54–67 is required for efficient nuclear shuttling (by FLIP assay) and for the mitotic-inducing function of CDC25B; p38 MAPK signaling regulates CDC25B localization in response to stress via the NES and Ser-323.","method":"Immunofluorescence with RNAi validation, FRAP/FLIP in live cells, mutagenesis of NES, p38 inhibitor treatment, UV/cycloheximide stress","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell FLIP assay + mutagenesis + pharmacological inhibition; single lab","pmids":["15456846"],"is_preprint":false},{"year":2005,"finding":"Beta-TrCP recognizes a non-phosphorylated DDG motif (DDGφXD) in CDC25B; this interaction is essential for ubiquitination and proteasomal degradation of CDC25B under normal (non-checkpoint) conditions, establishing SCF-β-TrCP as the E3 ubiquitin ligase that controls constitutive CDC25B turnover.","method":"Xenopus egg extract ubiquitination/degradation assays, mutagenesis of DDG motif, in vivo and in vitro binding assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — biochemical reconstitution in Xenopus extracts, mutagenesis, and cell-based degradation assays; multiple orthogonal methods","pmids":["15845771"],"is_preprint":false},{"year":2005,"finding":"Crystal structure of oxidized CDC25B reveals an intramolecular disulfide bond formed upon oxidation, with three P-loop conformations: active (apo), intermediate (sulfenic acid), and closed/inactive (disulfide). The closed conformation prevents substrate binding, defining the mechanism of reversible oxidative inactivation of CDC25B.","method":"X-ray crystallography time-course; structures of apo, sulfenic, disulfide, sulfinic and sulfonic forms","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures of multiple oxidation states in a single study; directly links structural rearrangement to inactivation mechanism","pmids":["15807524"],"is_preprint":false},{"year":2005,"finding":"Cdc25B specifically activates cyclin B1-CDK1 at centrosomes; RNAi depletion of Cdc25B causes G2 delay with reduced cyclin B1-CDK1 and cyclin A-CDK2 activities; time-lapse imaging shows Cdc25B has a unique centrosomal role in initiating mitosis distinct from Cdc25A (chromatin condensation).","method":"RNAi (siRNA), quantitative immunofluorescence, 3D time-lapse microscopy, CDK activity assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RNAi epistasis with multiple isoforms, quantitative live imaging, and kinase activity assays; distinct roles of each isoform established","pmids":["16216921"],"is_preprint":false},{"year":2005,"finding":"CDC25B is phosphorylated by pEg3 at Ser-169 in vitro (identified by mass spectrometry); this Ser-169-phosphorylated form accumulates during mitosis and localizes to centrosomes in vivo; RNAi knockdown of pEg3 abolishes the centrosomal signal.","method":"In vitro kinase assay, mass spectrometry, phospho-specific antibodies, immunofluorescence, RNAi","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry site identification, RNAi epistasis, in vivo localization; single lab","pmids":["15908796"],"is_preprint":false},{"year":2005,"finding":"Mice lacking both Cdc25B and Cdc25C are viable and born at expected Mendelian ratios; cells from double-knockout mice have normal cell cycles, DNA damage responses, and Cdc25A regulation, indicating that Cdc25A functionally compensates for the combined loss of Cdc25B and Cdc25C in somatic cells.","method":"Double-knockout mouse genetics, cell cycle profiling, checkpoint assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double-knockout and comprehensive cell biology analysis; clear functional redundancy established","pmids":["15767688"],"is_preprint":false},{"year":2006,"finding":"CHK1 phosphorylates CDC25B in vitro on multiple sites including S230 and S563; S230 phosphorylation occurs in vivo during S and G2 phases in the absence of DNA damage; phospho-S230 CDC25B localizes to centrosomes from early S phase; S230A mutation increases CDC25B's mitotic-inducing activity, establishing CHK1 as a constitutive negative regulator of centrosomal CDC25B.","method":"In vitro kinase assay, mass spectrometry, phospho-specific antibodies, immunofluorescence, S230A mutagenesis with functional assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay, mass spectrometry site mapping, in vivo phospho-specific localization, and gain-of-function mutagenesis; multiple orthogonal methods","pmids":["17003105"],"is_preprint":false},{"year":2006,"finding":"Chk1 inhibition induces a 'paraspindle' phenotype (regular spindle assembly but aberrant chromatin condensation) that is reverted by Cdc25B siRNA knockdown, and is phenocopied by Cdc25B (but not Cdc25A) overexpression; placing Cdc25B downstream of Chk1 in coordinating mitotic chromatin condensation with spindle assembly.","method":"Chk1 kinase inhibitor, siRNA knockdown, overexpression epistasis, microscopy of mitotic phenotypes","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic epistasis; single lab; phenotype well-defined","pmids":["17106257"],"is_preprint":false},{"year":2006,"finding":"MAPKAP kinase-2 (MK2) phosphorylates CDC25B on multiple sites (S169, S323, S353, S375) and p38 SAPK phosphorylates CDC25B on S249, as determined by mass spectrometry and phospho-specific antibodies; S323-phosphorylated CDC25B is detected at centrosomes during a normal cell cycle.","method":"In vitro kinase assay, mass spectrometry, phospho-specific antibodies, immunofluorescence","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — mass spectrometry plus antibody validation plus localization; single lab but rigorous site identification","pmids":["16861915"],"is_preprint":false},{"year":2007,"finding":"CDC25B localizes asymmetrically to the mother centrosome from S to G2 phases, along with CHK1, CDK1 and WEE1; siRNA inhibition of CDC25B causes accumulation of G2 cells with only single centrioles in separated centrosomes, indicating a role for CDC25B in centriole duplication.","method":"Immunofluorescence, siRNA knockdown, centrosome marker co-staining","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with defined centrosome duplication phenotype and immunofluorescence localization; single lab","pmids":["18235220"],"is_preprint":false},{"year":2007,"finding":"Overexpression of catalytically active (but not phosphatase-inactive) CDC25B at centrosomes causes centrosome overduplication, aberrant microtubule organization, and abnormal gamma-tubulin accumulation; inhibition of CDC25B phosphatase activity reduces interphase microtubule assembly and centrosomal gamma-tubulin localization, establishing CDC25B as part of the pathway controlling gamma-tubulin recruitment and centrosome duplication.","method":"Inducible overexpression, phosphatase-inactive mutant, siRNA, immunofluorescence for gamma-tubulin","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — catalytic-dead mutant distinguishes phosphatase-dependent effect; loss- and gain-of-function in same study; single lab","pmids":["18089784"],"is_preprint":false},{"year":2007,"finding":"CDC25B splice variants show differential mitotic stability: degradation of CDC25B after the metaphase-anaphase transition depends on KEN-box and RRKSE motifs located in the alternatively spliced B domain; CDC25B2, lacking the B domain, is stable during mitosis. Intramolecular FRET biosensors reveal major conformational changes in the N-terminal/B-domain region during mitosis.","method":"Time-lapse video microscopy, FRET biosensors, mutagenesis of degradation motifs (KEN-box, RRKSE), cyclin B1 co-degradation kinetics","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — motif mutagenesis, live-cell FRET, time-lapse; single lab with multiple orthogonal approaches","pmids":["17599046"],"is_preprint":false},{"year":2008,"finding":"PKA phosphorylates CDC25B at Ser-321 in vitro (not the S321A mutant); in mouse oocytes phospho-Ser321 CDC25B is cytoplasmic and detected in GV-arrested oocytes; S321A mutant enters the nucleus more rapidly and induces GVBD faster than wild-type; S321A also reduces 14-3-3 association, establishing PKA-mediated phosphorylation of Ser-321 as a mechanism for cytoplasmic sequestration of CDC25B to maintain meiotic prophase arrest.","method":"In vitro PKA kinase assay, fluorescent-tagged protein microinjection, GVBD assay in mouse oocytes, 14-3-3 co-immunoprecipitation, phospho-specific western blot","journal":"Cell cycle","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay plus in vivo oocyte assay plus localization plus binding assay; replicated by independent group (PMID 19035343, 23326474)","pmids":["19223768","19035343"],"is_preprint":false},{"year":2009,"finding":"PLK1 activity is required for relocalization of CDC25B from the cytoplasm to the nucleus at the G2-M transition; gain- and loss-of-function of PLK1 show that PLK1 stimulates CDC25B-induced mitotic entry both under normal conditions and after DNA damage-induced G2/M arrest.","method":"PLK1 inhibitor, gain/loss-of-function by overexpression and siRNA, subcellular localization by immunofluorescence, mitotic entry assay","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic epistasis with localization readout; single lab","pmids":["19185590"],"is_preprint":false},{"year":2009,"finding":"MEK1-dependent activation of the MAPK pathway destabilizes CDC25B protein specifically in G2 phase; re-introduction of CDC25B overcomes the MEK1-dependent G2 delay, defining MEK1 as a regulator of G2/M entry through CDC25B protein stability.","method":"MEK1 inhibitor (U0126), MEK1 overexpression, G2/M synchronization, CDC25B reintroduction rescue assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with rescue by CDC25B re-expression; single lab, specific epistasis demonstrated","pmids":["19801682"],"is_preprint":false},{"year":2009,"finding":"JNK1/2 and p38 MAPK induce CDC25B degradation in response to nongenotoxic stress (anisomycin); mass spectrometry and site-directed mutagenesis identified Ser-101 as the critical JNK/p38 phosphorylation site; S101A mutant CDC25B is refractory to anisomycin-induced degradation and can override anisomycin-induced G2 arrest.","method":"In vitro kinase assay, mass spectrometry, S101A mutagenesis, co-transfection, cell cycle analysis","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mass spectrometry site identification, mutagenesis, and functional bypass assay in one study","pmids":["19638579"],"is_preprint":false},{"year":2009,"finding":"Rapamycin induces phosphorylation of CDC25B at Ser-375; mutation S375A substantially reduces CDC25B phosphatase activity and inhibits rapamycin-induced AKT activation; CDC25B depletion attenuates rapamycin-induced oncogenic AKT signaling, establishing a rapamycin→CDC25B(pS375)→AKT oncogenic pathway.","method":"Phosphoproteomics (mass spectrometry), siRNA screen, site-directed mutagenesis (S375A), AKT phosphorylation assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphoproteomics plus mutagenesis plus siRNA epistasis; single lab, novel pathway","pmids":["19276368"],"is_preprint":false},{"year":2010,"finding":"Human Cdc14A phosphatase directly binds to and dephosphorylates Cdc25B, inhibiting its catalytic activity; increased Cdc14A levels delay mitotic entry by inhibiting CDK1-cyclin B1 activity through Cdc25B (and Cdc25A), while reduced Cdc14A accelerates mitotic entry, establishing Cdc14A as a direct negative regulator of CDC25B.","method":"Co-immunoprecipitation, in vitro dephosphorylation/activity assay, overexpression and knockdown experiments, CDK1-cyclin B1 activity assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro binding and dephosphorylation assay plus in vivo epistasis; single lab","pmids":["20956543"],"is_preprint":false},{"year":2011,"finding":"p53 transcriptionally represses CDC25B through a mechanism involving Sp1/Sp3 and NF-Y binding sites on the Cdc25B promoter; chromatin immunoprecipitation shows p53 occupies the Cdc25B promoter and mediates attenuation through these factors, and this repression occurs independently of p21.","method":"Promoter deletion/mutation analysis, ChIP, transient transfection reporter assays, p21-/- cell lines","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus promoter mutagenesis plus genetic cell models; single lab but multiple orthogonal tools","pmids":["21242964"],"is_preprint":false},{"year":2012,"finding":"CDC25B expression in neural progenitors of the developing chick spinal cord shortens G2 phase; RNAi knockdown of CDC25B specifically lengthens G2 without affecting S-phase, and reduces conversion of proliferating progenitors to post-mitotic neurons, establishing CDC25B as a regulator of G2 phase length and neurogenesis.","method":"In vivo RNAi knockdown in chick spinal cord, cell cycle phase length measurement, neuronal differentiation assays","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with specific G2-length and neurogenesis readouts in a developmental model; single lab","pmids":["22318230"],"is_preprint":false},{"year":2012,"finding":"Selenoprotein W (SelW) promotes recovery from G2 arrest by activating CDC25B; SelW knockdown causes sustained inactivation of CDC25B (maintained 14-3-3 binding) and delayed CDK1 dephosphorylation. SelW activates CDC25B by promoting dissociation of 14-3-3 from CDC25B through reduction of the intramolecular disulfide bond in a redox-dependent manner.","method":"siRNA knockdown of SelW, phospho-CDK1/CDC25B western blots, co-immunoprecipitation of CDC25B with 14-3-3, cell cycle analysis","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi epistasis combined with biochemical 14-3-3 binding assays and redox-based mechanism; single lab","pmids":["22982242"],"is_preprint":false},{"year":2013,"finding":"RSK (ribosomal S6 kinase) phosphorylates CDC25B (and CDC25A) at a conserved motif near the catalytic domain in vitro and in vivo in mitotic cells; phosphorylation at RSK sites increases CDC25B M-phase-inducing activity; RSK inhibition blocks G2/M transition, establishing RSK as an activating kinase for CDC25B.","method":"In vitro kinase assay with recombinant RSK and Xenopus egg extracts, site mutagenesis, RSK inhibitor, M-phase inducing assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro biochemical assay plus cell-based inhibitor epistasis; single lab","pmids":["23708659"],"is_preprint":false},{"year":2013,"finding":"MC1R/cAMP signaling delays G2-M progression in melanoma cells by phosphorylation and inhibition of Cdc25B; expression of a Cdc25B S323A phosphorylation-resistant mutant rescues the MC1R-induced G2 delay, placing Cdc25B downstream of cAMP/PKA in the MC1R pathway.","method":"MC1R overexpression, cAMP agonist treatment, Cdc25B S323A rescue, cell cycle analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic epistasis with mutagenesis rescue; single lab","pmids":["23908401"],"is_preprint":false},{"year":2013,"finding":"14-3-3ε specifically binds CDC25B at Ser-321; mutation Ser321Ala abolishes 14-3-3ε binding and cytoplasmic retention of CDC25B in mouse oocytes; co-expression of 14-3-3ε with wild-type CDC25B or a S321D phosphomimetic prevents GVBD, while S321A co-expressed with 14-3-3ε still induces GVBD, confirming Ser-321 is the specific 14-3-3ε binding site maintaining meiotic arrest.","method":"Co-immunoprecipitation, GVBD assay by microinjection, immunofluorescence co-localization, mutagenesis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional GVBD rescue with multiple mutants; replicates the S321 binding site identified in prior studies","pmids":["23326474"],"is_preprint":false},{"year":2014,"finding":"Fragment-based screening identified a compound that binds CDC25B at a pocket adjacent to the protein-protein interaction interface with CDK2/Cyclin A (not the active site); NMR data and crystal structure confirm the allosteric binding site; an analogue disrupts CDC25B–CDK2/Cyclin A interaction and inhibits CDK2 dephosphorylation, establishing that allosteric inhibition via the substrate-binding interface is a viable mechanism.","method":"NMR fragment screening, X-ray crystallography, co-immunoprecipitation disruption assay, in vitro CDK2 dephosphorylation assay","journal":"ACS chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure of inhibitor-bound CDC25B combined with NMR and in vitro functional disruption assay; orthogonal structural and biochemical methods","pmids":["25423142"],"is_preprint":false},{"year":2015,"finding":"LSD1 (a histone H3K4me2 demethylase) in mouse oocytes represses CDC25B transcription epigenetically; conditional deletion of Lsd1 causes upregulation of CDC25B, leading to precocious meiotic resumption, spindle and chromosomal defects, and oocyte failure, with CDC25B upregulation mechanistically responsible for the precocious CDK1 activation.","method":"Conditional oocyte-specific Lsd1 knockout, H3K4me2 ChIP, CDC25B mRNA/protein quantification, rescue experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic knockout plus ChIP mechanistic analysis plus defined CDC25B-dependent phenotype rescue; multiple orthogonal methods","pmids":["26626423"],"is_preprint":false},{"year":2019,"finding":"All seven YWHA (14-3-3) isoforms expressed in mouse oocytes interact with CDC25B, demonstrated by in situ proximity ligation assay and FRET microscopy (YWHAH/14-3-3η interaction confirmed by FRET); injection of R18 (a YWHA-blocking peptide) promotes GVBD; however, complete genetic deletion of YWHAH or YWHAE does not alter meiotic arrest, indicating these two isoforms individually are not essential.","method":"In situ proximity ligation assay, FRET microscopy, R18 peptide microinjection, oocyte-specific knockout of YWHAH and YWHAE","journal":"BMC developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PLA and FRET interactions plus genetic knockouts; YWHAH/YWHAE non-essentiality is a defined negative finding in the context of positive interaction data","pmids":["31640562"],"is_preprint":false},{"year":2022,"finding":"METTL3 induces m6A modification on CDC25B mRNA in the M phase; this m6A modification accelerates CDC25B mRNA translation via YTHDF1-dependent reading, increasing CDC25B protein and promoting cell cycle G2/M progression.","method":"m6A-seq/meRIP-qPCR, YTHDF1 knockdown, METTL3 knockdown/overexpression, ribosome profiling/translation assay, cell cycle analysis","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m6A mapping plus reader knockdown epistasis plus functional cell cycle readout; replicated in independent cancer context (PMID 35287752)","pmids":["35637959","35287752"],"is_preprint":false}],"current_model":"CDC25B is a dual-specificity phosphatase that removes inhibitory Thr-14/Tyr-15 phosphates from CDK1 to trigger mitotic entry; it acts as the primary 'starter phosphatase' at centrosomes during G2/M, where its activity is locally controlled by Aurora-A (activating, Ser-353), CHK1 (inhibitory, Ser-230), PLK1 (promotes nuclear import), PKA (inhibitory, Ser-321/323 in oocytes), CK2 (activating, Ser-186/187), pEg3 (Ser-169), JNK/p38 (destabilizing, Ser-101), RSK (activating), PKB/Akt (cytoplasmic sequestration via Ser-353), and MEK1-ERK (destabilization); its subcellular localization oscillates via a nuclear export sequence (aa 54–67/28–40), a nuclear localization signal (aa 335–354), and 14-3-3 protein binding to Ser-323/309/151/230 that constrains its structure and sequesters it in the cytoplasm; it is degraded by SCF-β-TrCP via a DDG motif and by the proteasome in a CDK1-cyclin A-dependent manner; it also functions as a ligand-independent coactivator of steroid receptors through direct protein–protein interaction; and it is epigenetically regulated at the mRNA level by LSD1/H3K4me2 and by METTL3-mediated m6A modification, which enhances YTHDF1-dependent translation."},"narrative":{"mechanistic_narrative":"CDC25B is a dual-specificity phosphatase that triggers mitotic entry by removing the inhibitory Thr-14/Tyr-15 phosphates from CDK1, acting as the 'starter phosphatase' for the G2/M transition [PMID:8440392, PMID:9683638]. Catalysis proceeds through a two-step phospho-cysteine intermediate mechanism, with the protein substrate itself supplying the catalytic acid for leaving-group protonation [PMID:8910325, PMID:10978163]. Functionally, CDC25B specifically activates cyclin B1-CDK1 at centrosomes, and its loss causes G2 delay; its catalytic activity is also required for normal centrosomal gamma-tubulin recruitment and centriole/centrosome duplication [PMID:16216921, PMID:18089784, PMID:18235220]. Genetic studies establish a non-redundant requirement in female meiosis—Cdc25b-null oocytes arrest in prophase with low MPF and are rescued by Cdc25b mRNA—whereas in somatic cells Cdc25A compensates for combined loss of Cdc25B and Cdc25C [PMID:11912493, PMID:15767688]. CDC25B activity, localization, and abundance are tightly controlled: activating phosphorylation by Aurora-A (Ser-353), CK2 (Ser-186/187), and RSK promotes mitotic entry [PMID:15128871, PMID:16082213, PMID:12527891, PMID:23708659], while CHK1 (Ser-230) and the phosphatase Cdc14A impose inhibitory control [PMID:17003105, PMID:20956543]. 14-3-3 binding to Ser-323 and cooperating low-affinity sites (Ser-151/230/309) forms an intramolecular bridge that blocks catalytic-site and nuclear-export-sequence access, sequestering CDC25B in the cytoplasm; checkpoint bypass follows disruption of this interaction [PMID:11466620, PMID:12764136, PMID:15173315]. Nucleo-cytoplasmic shuttling is governed by defined NES and NLS elements together with PLK1-driven nuclear import, and PKA-mediated Ser-321 phosphorylation maintains 14-3-3-dependent cytoplasmic sequestration to enforce meiotic prophase arrest [PMID:10822367, PMID:15456846, PMID:19185590, PMID:19223768, PMID:19035343]. CDC25B is degraded constitutively by SCF-β-TrCP via a non-phosphorylated DDG motif and in a CDK1-cyclin A-dependent proteasomal manner, with stress kinases (JNK/p38 via Ser-101) and MEK1 also driving its destabilization [PMID:15845771, PMID:9407044, PMID:19638579, PMID:19801682]. Independently of its phosphatase activity, CDC25B acts as a ligand-dependent coactivator of steroid receptors through direct protein interaction [PMID:11689696]. Its expression is further controlled by p53-mediated transcriptional repression, LSD1/H3K4me2 epigenetic repression in oocytes, and METTL3-deposited m6A that enhances YTHDF1-dependent translation [PMID:21242964, PMID:26626423, PMID:35637959, PMID:35287752].","teleology":[{"year":1993,"claim":"Established what CDC25B does enzymatically by showing it dephosphorylates the inhibitory residues of CDK1, defining it as an activating mitotic phosphatase.","evidence":"In vitro dephosphorylation of CDK1 with purified CDC25B","pmids":["8440392"],"confidence":"High","gaps":["In vitro substrate specificity did not address in vivo timing or compartmentalized action","Did not distinguish CDC25B from CDC25A/C roles"]},{"year":1996,"claim":"Defined the catalytic mechanism, showing CDC25B uses a phospho-cysteine intermediate typical of dual-specificity phosphatases.","evidence":"Pre-steady-state kinetics with OMFP and recombinant catalytic domain","pmids":["8910325"],"confidence":"High","gaps":["Used small-molecule substrate, not the physiological CDK substrate","Did not resolve the source of the catalytic acid"]},{"year":1998,"claim":"Demonstrated CDC25B is required for mitotic entry but not DNA replication, framing it as a G2-peaking 'starter phosphatase'.","evidence":"Neutralizing antibody microinjection plus activity assays in synchronized cells","pmids":["9683638"],"confidence":"High","gaps":["Did not localize the relevant pool of CDC25B","Mechanism of S-phase activating phosphorylation not identified"]},{"year":1999,"claim":"Showed CDC25B drives premature mitosis overriding the unreplicated-DNA checkpoint and is cytoplasmic via cyclin B1-dependent nuclear export, distinguishing it from CDC25C.","evidence":"Time-lapse imaging and GFP-chimera localization in synchronized cells","pmids":["10444066"],"confidence":"High","gaps":["Export machinery and signals not yet mapped","Functional consequence of cytoplasmic pool unclear"]},{"year":2000,"claim":"Mapped the NLS, NES, and 14-3-3 (Ser-323) requirement controlling regulated nucleo-cytoplasmic shuttling.","evidence":"Deletion/point mutants, leptomycin B, fractionation and immunofluorescence; two-hybrid 14-3-3 binding mapping","pmids":["10822367","10713667"],"confidence":"High","gaps":["Phosphorylation-independence of 14-3-3 binding was a single-lab claim","Did not show how 14-3-3 affects catalysis"]},{"year":2001,"claim":"Defined 14-3-3 as a direct activity brake (blocking substrate access) and uncovered a phosphatase-independent coactivator function for steroid receptors.","evidence":"Checkpoint bypass and activity assays with 14-3-3 mutants; GST-pulldown, two-hybrid and reporter assays for receptor coactivation","pmids":["11466620","11689696"],"confidence":"High","gaps":["Structural basis of catalytic-site occlusion not resolved","Physiological relevance of coactivator role to cell-cycle function unclear"]},{"year":2002,"claim":"Established CDC25B as the indispensable CDK1 activator for female meiotic resumption.","evidence":"Cdc25b knockout mice with mRNA-injection rescue and MPF assays","pmids":["11912493"],"confidence":"High","gaps":["Somatic redundancy not yet addressed","Upstream control in oocytes not defined"]},{"year":2003,"claim":"Identified opposing post-translational inputs—CK2 (Ser-186/187, activating) and PKB/Akt (Ser-353, cytoplasmic export)—and refined the 14-3-3 intramolecular bridge model (Ser-151/230/323).","evidence":"In vitro kinase assays, mass spectrometry, co-IP, localization and activity assays","pmids":["12527891","14630392","12764136"],"confidence":"Medium","gaps":["Single-lab site assignments","Integration of multiple phospho-inputs in vivo not resolved"]},{"year":2004,"claim":"Placed CDC25B in centrosomal G2/M signaling through Aurora-A phosphorylation at Ser-353 and refined isoform-selective 14-3-3 control of localization (Ser-309).","evidence":"In vitro kinase assays, RNAi, phospho-antibody microinjection, phosphomimetics, 14-3-3 isoform co-expression","pmids":["15128871","16082213","15173315"],"confidence":"High","gaps":["Crosstalk among Ser-353 kinases (Aurora-A vs Akt) not reconciled","Centrosomal substrate spectrum undefined"]},{"year":2005,"claim":"Defined the destruction and redox control of CDC25B—SCF-β-TrCP via a non-phospho DDG motif, and structural disulfide-based oxidative inactivation—and pinned its centrosomal cyclin B1-CDK1 activation to mitotic onset.","evidence":"Xenopus extract degradation assays; multi-state crystal structures; RNAi with quantitative live imaging and CDK activity assays; pEg3 Ser-169 mapping","pmids":["15845771","15807524","16216921","15908796"],"confidence":"High","gaps":["In vivo relevance of oxidation states uncertain","Coupling of degradation to checkpoint signaling incomplete"]},{"year":2005,"claim":"Demonstrated somatic redundancy: Cdc25A compensates for combined Cdc25B/Cdc25C loss.","evidence":"Double-knockout mouse genetics with cell-cycle and checkpoint profiling","pmids":["15767688"],"confidence":"High","gaps":["Did not address tissue-specific non-redundant contexts beyond oocytes"]},{"year":2006,"claim":"Identified CHK1 (Ser-230) as a constitutive negative regulator of centrosomal CDC25B and placed CDC25B downstream of CHK1 in coordinating chromatin condensation with spindle assembly; mapped stress-kinase sites (MK2, p38).","evidence":"In vitro kinase assays, mass spectrometry, phospho-antibody localization, gain-of-function mutants, CHK1-inhibitor epistasis","pmids":["17003105","17106257","16861915"],"confidence":"High","gaps":["How constitutive CHK1 signaling is integrated with activating inputs at centrosomes unclear","Functional weight of individual stress-kinase sites not separated"]},{"year":2007,"claim":"Extended CDC25B function to centrosome biology—asymmetric mother-centrosome localization, centriole duplication, and phosphatase-dependent gamma-tubulin recruitment.","evidence":"Immunofluorescence, siRNA, catalytic-dead and inducible overexpression with gamma-tubulin readouts; FRET biosensors and degradation-motif mapping","pmids":["18235220","18089784","17599046"],"confidence":"Medium","gaps":["Direct centrosomal substrates not identified","Single-lab findings for centrosome duplication role"]},{"year":2008,"claim":"Defined PKA-mediated Ser-321 phosphorylation as the mechanism sequestering CDC25B in the cytoplasm via 14-3-3 to maintain meiotic prophase arrest.","evidence":"In vitro PKA assay, oocyte microinjection/GVBD, 14-3-3 co-IP, phospho-antibodies","pmids":["19223768","19035343"],"confidence":"High","gaps":["Relationship between Ser-321 and Ser-323 14-3-3 control not fully resolved"]},{"year":2009,"claim":"Expanded the regulatory network with activating (RSK, PLK1-driven import) and destabilizing (JNK/p38 via Ser-101, MEK1) inputs and an oncogenic rapamycin→CDC25B(Ser-375)→AKT axis.","evidence":"In vitro kinase assays, mutagenesis, pharmacological/genetic epistasis, phosphoproteomics and rescue assays","pmids":["19185590","19638579","19801682","19276368"],"confidence":"Medium","gaps":["Single-lab pathway assignments","Hierarchy among competing kinase inputs in vivo undefined"]},{"year":2010,"claim":"Identified Cdc14A as a direct phosphatase that dephosphorylates and inhibits CDC25B to restrain mitotic entry.","evidence":"Co-IP, in vitro dephosphorylation/activity assays, overexpression/knockdown with CDK1-cyclin B1 readout","pmids":["20956543"],"confidence":"Medium","gaps":["Single-lab finding","Specific Cdc14A target residues on CDC25B not mapped"]},{"year":2012,"claim":"Showed CDC25B controls G2 length and influences neurogenesis in vivo, linking its cell-cycle role to developmental cell-fate decisions.","evidence":"In vivo RNAi in chick spinal cord with phase-length and differentiation readouts; p53 promoter-repression mapping","pmids":["22318230","21242964"],"confidence":"Medium","gaps":["Mechanism connecting G2 length to neuronal conversion unclear","Single-lab developmental finding"]},{"year":2013,"claim":"Clarified redox- and signaling-based activity control: SelW reduces the disulfide to release 14-3-3 and activate CDC25B; cAMP/PKA (MC1R) and 14-3-3ε (Ser-321) inhibit it.","evidence":"siRNA epistasis with 14-3-3 binding assays; MC1R/cAMP rescue with S323A; co-IP and GVBD rescue with 14-3-3ε mutants","pmids":["22982242","23908401","23326474"],"confidence":"Medium","gaps":["Physiological redox triggers of SelW action uncertain","Single-lab mechanistic claims"]},{"year":2015,"claim":"Established epigenetic control of CDC25B levels: LSD1/H3K4me2 represses CDC25B transcription in oocytes, with CDC25B upregulation responsible for precocious CDK1 activation and oocyte failure.","evidence":"Conditional Lsd1 oocyte knockout, H3K4me2 ChIP, CDC25B quantification and rescue","pmids":["26626423"],"confidence":"High","gaps":["Generalizability beyond oocytes not shown"]},{"year":2019,"claim":"Showed all seven 14-3-3 isoforms interact with CDC25B in oocytes but that single deletion of YWHAH or YWHAE is dispensable for meiotic arrest, indicating functional redundancy among isoforms.","evidence":"Proximity ligation assay, FRET, R18 peptide injection, single-isoform knockouts","pmids":["31640562"],"confidence":"Medium","gaps":["Combinatorial isoform requirement not determined","Per-isoform site preferences in oocytes not resolved"]},{"year":2022,"claim":"Identified m6A-based translational control of CDC25B, with METTL3 deposition and YTHDF1 reading accelerating its translation to drive G2/M progression.","evidence":"meRIP-qPCR/m6A-seq, METTL3 and YTHDF1 knockdown, ribosome profiling and cell-cycle analysis","pmids":["35637959","35287752"],"confidence":"Medium","gaps":["Spatial/temporal coupling of m6A control to mitotic timing unresolved","Specific m6A sites on CDC25B mRNA not defined"]},{"year":null,"claim":"How the many competing activating, inhibitory, localization, and degradation inputs are quantitatively integrated to produce a switch-like, spatially controlled CDC25B activation at centrosomes remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model reconciles the multiple kinases targeting overlapping residues (e.g., Ser-353, Ser-323)","Centrosomal substrate(s) beyond CDK1 not identified","Tissue-specific essentiality outside oocytes not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,8,21,42]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[10]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,15,17,18,30]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5,6,18,31]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[16,21,22,24,27,28]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,4,5,21]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[11,30,43]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[45]}],"complexes":[],"partners":["CDK1","CDK2","YWHAB","YWHAE","YWHAH","CSNK2B","CDC14A","AURKA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P30305","full_name":"M-phase inducer phosphatase 2","aliases":["Dual specificity phosphatase Cdc25B"],"length_aa":580,"mass_kda":65.0,"function":"Tyrosine protein phosphatase which functions as a dosage-dependent inducer of mitotic progression (PubMed:1836978, PubMed:20360007). Directly dephosphorylates CDK1 and stimulates its kinase activity (PubMed:20360007). Required for G2/M phases of the cell cycle progression and abscission during cytokinesis in a ECT2-dependent manner (PubMed:17332740). The three isoforms seem to have a different level of activity (PubMed:1836978)","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, spindle pole","url":"https://www.uniprot.org/uniprotkb/P30305/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CDC25B","classification":"Not Classified","n_dependent_lines":249,"n_total_lines":1208,"dependency_fraction":0.20612582781456953},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"SNRPC","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CDC25B","total_profiled":1310},"omim":[{"mim_id":"614593","title":"MEIOSIS REGULATOR AND mRNA STABILITY FACTOR 1; MARF1","url":"https://www.omim.org/entry/614593"},{"mim_id":"609236","title":"BR SERINE/THREONINE KINASE 2; BRSK2","url":"https://www.omim.org/entry/609236"},{"mim_id":"605066","title":"TYROSINE 3-MONOOXYGENASE/TRYPTOPHAN 5-MONOOXYGENASE ACTIVATION PROTEIN, EPSILON ISOFORM; YWHAE","url":"https://www.omim.org/entry/605066"},{"mim_id":"602341","title":"FORKHEAD BOX M1; FOXM1","url":"https://www.omim.org/entry/602341"},{"mim_id":"600289","title":"MITOGEN-ACTIVATED PROTEIN KINASE 14; MAPK14","url":"https://www.omim.org/entry/600289"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Vesicles","reliability":"Uncertain"},{"location":"Mitotic spindle","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CDC25B"},"hgnc":{"alias_symbol":["MPIP2"],"prev_symbol":[]},"alphafold":{"accession":"P30305","domains":[{"cath_id":"3.40.250.10","chopping":"387-548","consensus_level":"high","plddt":96.1035,"start":387,"end":548}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P30305","model_url":"https://alphafold.ebi.ac.uk/files/AF-P30305-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P30305-F1-predicted_aligned_error_v6.png","plddt_mean":63.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CDC25B","jax_strain_url":"https://www.jax.org/strain/search?query=CDC25B"},"sequence":{"accession":"P30305","fasta_url":"https://rest.uniprot.org/uniprotkb/P30305.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P30305/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P30305"}},"corpus_meta":[{"pmid":"9683638","id":"PMC_9683638","title":"The cdc25B phosphatase is 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mechanistic framework\",\n      \"pmids\": [\"8910325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Alternative splicing of CDC25B produces at least three variants (CDC25B1, B2, B3) that differ in activity; in fission yeast complementation assays CDC25B2 > CDC25B3 > CDC25B1 in mitosis-inducing activity, suggesting splice variation controls cell proliferation.\",\n      \"method\": \"cDNA cloning, genomic sequencing, in vitro phosphatase assay, episomal expression in S. pombe complementation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional complementation in yeast plus in vitro activity assays; activity differences confirmed by orthogonal methods in one lab\",\n      \"pmids\": [\"9188863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CDC25B is degraded by the proteasome in a manner dependent on phosphorylation by CDK1-cyclin A but not CDK1-cyclin B, identifying CDK1-cyclin A as a writer that targets CDC25B for proteasomal destruction at the G2/M transition.\",\n      \"method\": \"In vitro phosphorylation assays, proteasome inhibitor treatment, in vivo degradation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay combined with in vivo proteasome inhibitor experiments; isoform-specificity (cyclin A vs. B) established with orthogonal methods\",\n      \"pmids\": [\"9407044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Ablation of CDC25B function by microinjection of specific antibodies blocks entry into mitosis in Hs68 cells, but does not affect later stages of mitosis or initiation of DNA replication. CDC25B activity peaks during G2, and is activated by phosphorylation during S-phase both in vitro and in vivo, supporting its role as a 'starter phosphatase' for mitosis.\",\n      \"method\": \"Microinjection of neutralizing antibodies, cell cycle synchronization, kinase/phosphatase activity assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — microinjection loss-of-function combined with in vitro and in vivo biochemical assays; independently replicated concept\",\n      \"pmids\": [\"9683638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Overexpression of CDC25B, but not CDC25C, causes S-phase and G2-phase cells to enter mitosis prematurely, overriding the unreplicated-DNA checkpoint. CDC25B is cytoplasmic during S and G2 phases due to nuclear export, and this nuclear export is dependent on cyclin B1, establishing a distinct localization and checkpoint behavior compared to CDC25C.\",\n      \"method\": \"Time-lapse fluorescence microscopy, microinjection of expression constructs, cell synchronization, GFP-chimera imaging\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell imaging with functional readouts and domain mutants in synchronized cells; multiple orthogonal methods in one study\",\n      \"pmids\": [\"10444066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CDC25B contains a nuclear localization signal (residues 335–354) and a nuclear export sequence (residues 28–40). Interaction with 14-3-3 proteins via Ser-323 is required for cytoplasmic retention; mutation of Ser-323 or treatment with the exportin inhibitor leptomycin B retains CDC25B in the nucleus, demonstrating regulated nucleo-cytoplasmic shuttling.\",\n      \"method\": \"Transfection of HA-tagged deletion/truncation/point-mutant constructs, leptomycin B treatment, subcellular fractionation/immunofluorescence\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic deletion mapping and pharmacological inhibition, multiple orthogonal methods; replicated by later studies\",\n      \"pmids\": [\"10822367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CDC25B interacts with 14-3-3 proteins; in two-hybrid assays all three CDC25B splice variants bind 14-3-3η, β, and ζ but poorly bind ε and θ. Interaction requires the integrity of Ser-323 but is independent of phosphorylation, unlike CDC25C, and a high-affinity site for 14-3-3ζ/η is exposed by N-terminal truncation.\",\n      \"method\": \"Two-hybrid assay, in vitro binding assays, phosphorylation/dephosphorylation experiments, deletion constructs\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — two-hybrid plus in vitro binding; interaction characteristics replicated in subsequent studies but phosphorylation-independence was single-lab finding\",\n      \"pmids\": [\"10713667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The catalytic acid required for protonation of the leaving group in CDC25B phosphatase activity resides on the protein substrate (CDK2-pTpY/CycA) rather than within the known structure of CDC25B; neither Glu474 nor Glu478, previously proposed, is responsible for the observed pH dependence observed with the natural substrate.\",\n      \"method\": \"pH-dependent kinetic analysis, site-directed mutagenesis, truncation experiments with small-molecule and natural substrates\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous kinetics and mutagenesis but single lab; result is a negative finding regarding proposed residues combined with a positive finding for substrate-provided catalytic acid\",\n      \"pmids\": [\"10978163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"14-3-3 binding to Ser-323 of CDC25B directly inhibits its phosphatase activity by blocking substrate (cyclin/CDK) access to the catalytic site; mutation of Ser-323 or removal of the N-terminal regulatory domain strongly activates CDC25B and enables bypass of the G2 checkpoint, providing mechanistic evidence that 14-3-3 controls CDC25B activity.\",\n      \"method\": \"Cell-based overexpression and checkpoint bypass assays, phosphatase activity assays with 14-3-3 binding mutants\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional checkpoint bypass combined with in vitro activity measurement and structure-function mutation analysis\",\n      \"pmids\": [\"11466620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CDC25B acts as a coactivator for steroid receptors (including the androgen receptor and estrogen receptor) in a hormone-dependent manner, independent of its phosphatase catalytic activity. CDC25B directly interacts with steroid receptors (demonstrated by GST-pulldown and mammalian two-hybrid assays) and synergizes with CBP and p300/PCAF coactivators.\",\n      \"method\": \"Transient transfection reporter assays, cell-free assay with chromatin templates, GST-pulldown, mammalian two-hybrid\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical methods (GST-pulldown, two-hybrid, chromatin template assay, reporter assay) demonstrating phosphatase-independent interaction and coactivation\",\n      \"pmids\": [\"11689696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Cdc25b is essential for resumption of meiosis in female mice; Cdc25b-/- oocytes remain permanently arrested at prophase with low MPF (CDK1/cyclin B) activity. Microinjection of wild-type Cdc25b mRNA restores MPF activation and meiotic resumption, establishing Cdc25b as the indispensable activator of CDK1 for meiotic entry.\",\n      \"method\": \"Gene-targeted knockout mice (Cdc25b-/-), mRNA microinjection rescue, MPF activity assay\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined sterility phenotype, rescued by mRNA injection, multiple orthogonal validations; replicated in concept by subsequent studies\",\n      \"pmids\": [\"11912493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The kinase pEg3 (PAR-1/MARK family) specifically phosphorylates CDC25B in vitro on Ser-323 and associates with CDC25B in vitro and in vivo; ectopic expression of active pEg3 causes G2 accumulation that is counteracted by CDC25B overexpression, placing pEg3 as an antagonistic regulator of CDC25B at G2/M.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, ectopic expression in U2OS cells, cell cycle analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay plus co-IP plus epistasis by overexpression; single lab\",\n      \"pmids\": [\"12400006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Protein kinase CK2 phosphorylates CDC25B in vitro on Ser-186 and Ser-187 (identified by mass spectrometry), interacts with CDC25B via the CK2β subunit (residues 1–55 of CK2β binding residues 122–200 of CDC25B), and phosphorylation by CK2 increases CDC25B catalytic activity both in vitro and in vivo.\",\n      \"method\": \"In vitro kinase assay, mass spectrometry, co-immunoprecipitation, phosphatase activity assay in Sf9 and U2OS cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mass spectrometry identification of sites, in vitro assay, in vivo co-IP and activity measurement; multiple orthogonal methods\",\n      \"pmids\": [\"12527891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"14-3-3 acts as an intramolecular bridge in CDC25B: Ser-151 and Ser-230 in the N-terminal domain are functional low-affinity 14-3-3 binding sites that cooperate with the high-affinity Ser-323 site to form a bridge constraining CDC25B structure and blocking catalytic site access and nuclear export sequence access.\",\n      \"method\": \"Mutagenesis of 14-3-3 binding sites, cell-based localization and activity assays, deletion constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutagenesis combined with functional assays; single lab but multiple sites mapped\",\n      \"pmids\": [\"12764136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PKB/Akt phosphorylates CDC25B on Ser-353, resulting in nuclear export-dependent cytoplasmic accumulation; oxidative stress activates PKB/Akt and reproduces this effect on CDC25B phosphorylation and localization.\",\n      \"method\": \"In vitro kinase assay, mutagenesis (S353A), subcellular fractionation and immunofluorescence, oxidative stress treatment\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay plus in vivo localization analysis with point mutant; single lab\",\n      \"pmids\": [\"14630392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Aurora-A kinase phosphorylates CDC25B on Ser-353 both in vitro and in vivo at the centrosome; this phosphorylated form localizes to centrosomes during mitosis, and microinjection of anti-phospho-S353 antibodies causes mitotic delay while a S353 phosphomimetic mutant enhances mitotic entry, demonstrating Aurora-A–CDC25B centrosomal signaling contributes to the G2-M transition.\",\n      \"method\": \"In vitro kinase assay, RNAi knockdown, immunofluorescence, microinjection of phospho-specific antibodies, overexpression of phosphomimetic mutant\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay, RNAi epistasis, antibody microinjection, and phosphomimetic mutant; replicated by two independent publications (PMID 15128871 and 16082213)\",\n      \"pmids\": [\"15128871\", \"16082213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"14-3-3β binding to Ser-309 (not Ser-216 or Ser-137) of CDC25B is sufficient to drive CDC25B to the cytoplasm; 14-3-3ε shares this behavior, while 14-3-3σ binds preferentially at Ser-216 but does not alter CDC25B localization, demonstrating isoform-selective 14-3-3 binding controls CDC25B subcellular distribution.\",\n      \"method\": \"Site-directed mutagenesis, co-expression of FLAG-tagged CDC25B with various 14-3-3 isoforms, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutagenesis with immunofluorescence readout; single lab but multiple isoforms and sites tested\",\n      \"pmids\": [\"15173315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Endogenous CDC25B is mainly nuclear but a fraction is cytoplasmic during G2; a nuclear export sequence (NES) at amino acids 54–67 is required for efficient nuclear shuttling (by FLIP assay) and for the mitotic-inducing function of CDC25B; p38 MAPK signaling regulates CDC25B localization in response to stress via the NES and Ser-323.\",\n      \"method\": \"Immunofluorescence with RNAi validation, FRAP/FLIP in live cells, mutagenesis of NES, p38 inhibitor treatment, UV/cycloheximide stress\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell FLIP assay + mutagenesis + pharmacological inhibition; single lab\",\n      \"pmids\": [\"15456846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Beta-TrCP recognizes a non-phosphorylated DDG motif (DDGφXD) in CDC25B; this interaction is essential for ubiquitination and proteasomal degradation of CDC25B under normal (non-checkpoint) conditions, establishing SCF-β-TrCP as the E3 ubiquitin ligase that controls constitutive CDC25B turnover.\",\n      \"method\": \"Xenopus egg extract ubiquitination/degradation assays, mutagenesis of DDG motif, in vivo and in vitro binding assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biochemical reconstitution in Xenopus extracts, mutagenesis, and cell-based degradation assays; multiple orthogonal methods\",\n      \"pmids\": [\"15845771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structure of oxidized CDC25B reveals an intramolecular disulfide bond formed upon oxidation, with three P-loop conformations: active (apo), intermediate (sulfenic acid), and closed/inactive (disulfide). The closed conformation prevents substrate binding, defining the mechanism of reversible oxidative inactivation of CDC25B.\",\n      \"method\": \"X-ray crystallography time-course; structures of apo, sulfenic, disulfide, sulfinic and sulfonic forms\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures of multiple oxidation states in a single study; directly links structural rearrangement to inactivation mechanism\",\n      \"pmids\": [\"15807524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cdc25B specifically activates cyclin B1-CDK1 at centrosomes; RNAi depletion of Cdc25B causes G2 delay with reduced cyclin B1-CDK1 and cyclin A-CDK2 activities; time-lapse imaging shows Cdc25B has a unique centrosomal role in initiating mitosis distinct from Cdc25A (chromatin condensation).\",\n      \"method\": \"RNAi (siRNA), quantitative immunofluorescence, 3D time-lapse microscopy, CDK activity assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi epistasis with multiple isoforms, quantitative live imaging, and kinase activity assays; distinct roles of each isoform established\",\n      \"pmids\": [\"16216921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CDC25B is phosphorylated by pEg3 at Ser-169 in vitro (identified by mass spectrometry); this Ser-169-phosphorylated form accumulates during mitosis and localizes to centrosomes in vivo; RNAi knockdown of pEg3 abolishes the centrosomal signal.\",\n      \"method\": \"In vitro kinase assay, mass spectrometry, phospho-specific antibodies, immunofluorescence, RNAi\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry site identification, RNAi epistasis, in vivo localization; single lab\",\n      \"pmids\": [\"15908796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mice lacking both Cdc25B and Cdc25C are viable and born at expected Mendelian ratios; cells from double-knockout mice have normal cell cycles, DNA damage responses, and Cdc25A regulation, indicating that Cdc25A functionally compensates for the combined loss of Cdc25B and Cdc25C in somatic cells.\",\n      \"method\": \"Double-knockout mouse genetics, cell cycle profiling, checkpoint assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double-knockout and comprehensive cell biology analysis; clear functional redundancy established\",\n      \"pmids\": [\"15767688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CHK1 phosphorylates CDC25B in vitro on multiple sites including S230 and S563; S230 phosphorylation occurs in vivo during S and G2 phases in the absence of DNA damage; phospho-S230 CDC25B localizes to centrosomes from early S phase; S230A mutation increases CDC25B's mitotic-inducing activity, establishing CHK1 as a constitutive negative regulator of centrosomal CDC25B.\",\n      \"method\": \"In vitro kinase assay, mass spectrometry, phospho-specific antibodies, immunofluorescence, S230A mutagenesis with functional assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay, mass spectrometry site mapping, in vivo phospho-specific localization, and gain-of-function mutagenesis; multiple orthogonal methods\",\n      \"pmids\": [\"17003105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Chk1 inhibition induces a 'paraspindle' phenotype (regular spindle assembly but aberrant chromatin condensation) that is reverted by Cdc25B siRNA knockdown, and is phenocopied by Cdc25B (but not Cdc25A) overexpression; placing Cdc25B downstream of Chk1 in coordinating mitotic chromatin condensation with spindle assembly.\",\n      \"method\": \"Chk1 kinase inhibitor, siRNA knockdown, overexpression epistasis, microscopy of mitotic phenotypes\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic epistasis; single lab; phenotype well-defined\",\n      \"pmids\": [\"17106257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MAPKAP kinase-2 (MK2) phosphorylates CDC25B on multiple sites (S169, S323, S353, S375) and p38 SAPK phosphorylates CDC25B on S249, as determined by mass spectrometry and phospho-specific antibodies; S323-phosphorylated CDC25B is detected at centrosomes during a normal cell cycle.\",\n      \"method\": \"In vitro kinase assay, mass spectrometry, phospho-specific antibodies, immunofluorescence\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mass spectrometry plus antibody validation plus localization; single lab but rigorous site identification\",\n      \"pmids\": [\"16861915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CDC25B localizes asymmetrically to the mother centrosome from S to G2 phases, along with CHK1, CDK1 and WEE1; siRNA inhibition of CDC25B causes accumulation of G2 cells with only single centrioles in separated centrosomes, indicating a role for CDC25B in centriole duplication.\",\n      \"method\": \"Immunofluorescence, siRNA knockdown, centrosome marker co-staining\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with defined centrosome duplication phenotype and immunofluorescence localization; single lab\",\n      \"pmids\": [\"18235220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Overexpression of catalytically active (but not phosphatase-inactive) CDC25B at centrosomes causes centrosome overduplication, aberrant microtubule organization, and abnormal gamma-tubulin accumulation; inhibition of CDC25B phosphatase activity reduces interphase microtubule assembly and centrosomal gamma-tubulin localization, establishing CDC25B as part of the pathway controlling gamma-tubulin recruitment and centrosome duplication.\",\n      \"method\": \"Inducible overexpression, phosphatase-inactive mutant, siRNA, immunofluorescence for gamma-tubulin\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — catalytic-dead mutant distinguishes phosphatase-dependent effect; loss- and gain-of-function in same study; single lab\",\n      \"pmids\": [\"18089784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CDC25B splice variants show differential mitotic stability: degradation of CDC25B after the metaphase-anaphase transition depends on KEN-box and RRKSE motifs located in the alternatively spliced B domain; CDC25B2, lacking the B domain, is stable during mitosis. Intramolecular FRET biosensors reveal major conformational changes in the N-terminal/B-domain region during mitosis.\",\n      \"method\": \"Time-lapse video microscopy, FRET biosensors, mutagenesis of degradation motifs (KEN-box, RRKSE), cyclin B1 co-degradation kinetics\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — motif mutagenesis, live-cell FRET, time-lapse; single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"17599046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PKA phosphorylates CDC25B at Ser-321 in vitro (not the S321A mutant); in mouse oocytes phospho-Ser321 CDC25B is cytoplasmic and detected in GV-arrested oocytes; S321A mutant enters the nucleus more rapidly and induces GVBD faster than wild-type; S321A also reduces 14-3-3 association, establishing PKA-mediated phosphorylation of Ser-321 as a mechanism for cytoplasmic sequestration of CDC25B to maintain meiotic prophase arrest.\",\n      \"method\": \"In vitro PKA kinase assay, fluorescent-tagged protein microinjection, GVBD assay in mouse oocytes, 14-3-3 co-immunoprecipitation, phospho-specific western blot\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay plus in vivo oocyte assay plus localization plus binding assay; replicated by independent group (PMID 19035343, 23326474)\",\n      \"pmids\": [\"19223768\", \"19035343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PLK1 activity is required for relocalization of CDC25B from the cytoplasm to the nucleus at the G2-M transition; gain- and loss-of-function of PLK1 show that PLK1 stimulates CDC25B-induced mitotic entry both under normal conditions and after DNA damage-induced G2/M arrest.\",\n      \"method\": \"PLK1 inhibitor, gain/loss-of-function by overexpression and siRNA, subcellular localization by immunofluorescence, mitotic entry assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic epistasis with localization readout; single lab\",\n      \"pmids\": [\"19185590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MEK1-dependent activation of the MAPK pathway destabilizes CDC25B protein specifically in G2 phase; re-introduction of CDC25B overcomes the MEK1-dependent G2 delay, defining MEK1 as a regulator of G2/M entry through CDC25B protein stability.\",\n      \"method\": \"MEK1 inhibitor (U0126), MEK1 overexpression, G2/M synchronization, CDC25B reintroduction rescue assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with rescue by CDC25B re-expression; single lab, specific epistasis demonstrated\",\n      \"pmids\": [\"19801682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"JNK1/2 and p38 MAPK induce CDC25B degradation in response to nongenotoxic stress (anisomycin); mass spectrometry and site-directed mutagenesis identified Ser-101 as the critical JNK/p38 phosphorylation site; S101A mutant CDC25B is refractory to anisomycin-induced degradation and can override anisomycin-induced G2 arrest.\",\n      \"method\": \"In vitro kinase assay, mass spectrometry, S101A mutagenesis, co-transfection, cell cycle analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mass spectrometry site identification, mutagenesis, and functional bypass assay in one study\",\n      \"pmids\": [\"19638579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Rapamycin induces phosphorylation of CDC25B at Ser-375; mutation S375A substantially reduces CDC25B phosphatase activity and inhibits rapamycin-induced AKT activation; CDC25B depletion attenuates rapamycin-induced oncogenic AKT signaling, establishing a rapamycin→CDC25B(pS375)→AKT oncogenic pathway.\",\n      \"method\": \"Phosphoproteomics (mass spectrometry), siRNA screen, site-directed mutagenesis (S375A), AKT phosphorylation assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphoproteomics plus mutagenesis plus siRNA epistasis; single lab, novel pathway\",\n      \"pmids\": [\"19276368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human Cdc14A phosphatase directly binds to and dephosphorylates Cdc25B, inhibiting its catalytic activity; increased Cdc14A levels delay mitotic entry by inhibiting CDK1-cyclin B1 activity through Cdc25B (and Cdc25A), while reduced Cdc14A accelerates mitotic entry, establishing Cdc14A as a direct negative regulator of CDC25B.\",\n      \"method\": \"Co-immunoprecipitation, in vitro dephosphorylation/activity assay, overexpression and knockdown experiments, CDK1-cyclin B1 activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro binding and dephosphorylation assay plus in vivo epistasis; single lab\",\n      \"pmids\": [\"20956543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"p53 transcriptionally represses CDC25B through a mechanism involving Sp1/Sp3 and NF-Y binding sites on the Cdc25B promoter; chromatin immunoprecipitation shows p53 occupies the Cdc25B promoter and mediates attenuation through these factors, and this repression occurs independently of p21.\",\n      \"method\": \"Promoter deletion/mutation analysis, ChIP, transient transfection reporter assays, p21-/- cell lines\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus promoter mutagenesis plus genetic cell models; single lab but multiple orthogonal tools\",\n      \"pmids\": [\"21242964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CDC25B expression in neural progenitors of the developing chick spinal cord shortens G2 phase; RNAi knockdown of CDC25B specifically lengthens G2 without affecting S-phase, and reduces conversion of proliferating progenitors to post-mitotic neurons, establishing CDC25B as a regulator of G2 phase length and neurogenesis.\",\n      \"method\": \"In vivo RNAi knockdown in chick spinal cord, cell cycle phase length measurement, neuronal differentiation assays\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with specific G2-length and neurogenesis readouts in a developmental model; single lab\",\n      \"pmids\": [\"22318230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Selenoprotein W (SelW) promotes recovery from G2 arrest by activating CDC25B; SelW knockdown causes sustained inactivation of CDC25B (maintained 14-3-3 binding) and delayed CDK1 dephosphorylation. SelW activates CDC25B by promoting dissociation of 14-3-3 from CDC25B through reduction of the intramolecular disulfide bond in a redox-dependent manner.\",\n      \"method\": \"siRNA knockdown of SelW, phospho-CDK1/CDC25B western blots, co-immunoprecipitation of CDC25B with 14-3-3, cell cycle analysis\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi epistasis combined with biochemical 14-3-3 binding assays and redox-based mechanism; single lab\",\n      \"pmids\": [\"22982242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RSK (ribosomal S6 kinase) phosphorylates CDC25B (and CDC25A) at a conserved motif near the catalytic domain in vitro and in vivo in mitotic cells; phosphorylation at RSK sites increases CDC25B M-phase-inducing activity; RSK inhibition blocks G2/M transition, establishing RSK as an activating kinase for CDC25B.\",\n      \"method\": \"In vitro kinase assay with recombinant RSK and Xenopus egg extracts, site mutagenesis, RSK inhibitor, M-phase inducing assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro biochemical assay plus cell-based inhibitor epistasis; single lab\",\n      \"pmids\": [\"23708659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MC1R/cAMP signaling delays G2-M progression in melanoma cells by phosphorylation and inhibition of Cdc25B; expression of a Cdc25B S323A phosphorylation-resistant mutant rescues the MC1R-induced G2 delay, placing Cdc25B downstream of cAMP/PKA in the MC1R pathway.\",\n      \"method\": \"MC1R overexpression, cAMP agonist treatment, Cdc25B S323A rescue, cell cycle analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic epistasis with mutagenesis rescue; single lab\",\n      \"pmids\": [\"23908401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"14-3-3ε specifically binds CDC25B at Ser-321; mutation Ser321Ala abolishes 14-3-3ε binding and cytoplasmic retention of CDC25B in mouse oocytes; co-expression of 14-3-3ε with wild-type CDC25B or a S321D phosphomimetic prevents GVBD, while S321A co-expressed with 14-3-3ε still induces GVBD, confirming Ser-321 is the specific 14-3-3ε binding site maintaining meiotic arrest.\",\n      \"method\": \"Co-immunoprecipitation, GVBD assay by microinjection, immunofluorescence co-localization, mutagenesis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional GVBD rescue with multiple mutants; replicates the S321 binding site identified in prior studies\",\n      \"pmids\": [\"23326474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Fragment-based screening identified a compound that binds CDC25B at a pocket adjacent to the protein-protein interaction interface with CDK2/Cyclin A (not the active site); NMR data and crystal structure confirm the allosteric binding site; an analogue disrupts CDC25B–CDK2/Cyclin A interaction and inhibits CDK2 dephosphorylation, establishing that allosteric inhibition via the substrate-binding interface is a viable mechanism.\",\n      \"method\": \"NMR fragment screening, X-ray crystallography, co-immunoprecipitation disruption assay, in vitro CDK2 dephosphorylation assay\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure of inhibitor-bound CDC25B combined with NMR and in vitro functional disruption assay; orthogonal structural and biochemical methods\",\n      \"pmids\": [\"25423142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LSD1 (a histone H3K4me2 demethylase) in mouse oocytes represses CDC25B transcription epigenetically; conditional deletion of Lsd1 causes upregulation of CDC25B, leading to precocious meiotic resumption, spindle and chromosomal defects, and oocyte failure, with CDC25B upregulation mechanistically responsible for the precocious CDK1 activation.\",\n      \"method\": \"Conditional oocyte-specific Lsd1 knockout, H3K4me2 ChIP, CDC25B mRNA/protein quantification, rescue experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic knockout plus ChIP mechanistic analysis plus defined CDC25B-dependent phenotype rescue; multiple orthogonal methods\",\n      \"pmids\": [\"26626423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"All seven YWHA (14-3-3) isoforms expressed in mouse oocytes interact with CDC25B, demonstrated by in situ proximity ligation assay and FRET microscopy (YWHAH/14-3-3η interaction confirmed by FRET); injection of R18 (a YWHA-blocking peptide) promotes GVBD; however, complete genetic deletion of YWHAH or YWHAE does not alter meiotic arrest, indicating these two isoforms individually are not essential.\",\n      \"method\": \"In situ proximity ligation assay, FRET microscopy, R18 peptide microinjection, oocyte-specific knockout of YWHAH and YWHAE\",\n      \"journal\": \"BMC developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PLA and FRET interactions plus genetic knockouts; YWHAH/YWHAE non-essentiality is a defined negative finding in the context of positive interaction data\",\n      \"pmids\": [\"31640562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 induces m6A modification on CDC25B mRNA in the M phase; this m6A modification accelerates CDC25B mRNA translation via YTHDF1-dependent reading, increasing CDC25B protein and promoting cell cycle G2/M progression.\",\n      \"method\": \"m6A-seq/meRIP-qPCR, YTHDF1 knockdown, METTL3 knockdown/overexpression, ribosome profiling/translation assay, cell cycle analysis\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m6A mapping plus reader knockdown epistasis plus functional cell cycle readout; replicated in independent cancer context (PMID 35287752)\",\n      \"pmids\": [\"35637959\", \"35287752\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDC25B is a dual-specificity phosphatase that removes inhibitory Thr-14/Tyr-15 phosphates from CDK1 to trigger mitotic entry; it acts as the primary 'starter phosphatase' at centrosomes during G2/M, where its activity is locally controlled by Aurora-A (activating, Ser-353), CHK1 (inhibitory, Ser-230), PLK1 (promotes nuclear import), PKA (inhibitory, Ser-321/323 in oocytes), CK2 (activating, Ser-186/187), pEg3 (Ser-169), JNK/p38 (destabilizing, Ser-101), RSK (activating), PKB/Akt (cytoplasmic sequestration via Ser-353), and MEK1-ERK (destabilization); its subcellular localization oscillates via a nuclear export sequence (aa 54–67/28–40), a nuclear localization signal (aa 335–354), and 14-3-3 protein binding to Ser-323/309/151/230 that constrains its structure and sequesters it in the cytoplasm; it is degraded by SCF-β-TrCP via a DDG motif and by the proteasome in a CDK1-cyclin A-dependent manner; it also functions as a ligand-independent coactivator of steroid receptors through direct protein–protein interaction; and it is epigenetically regulated at the mRNA level by LSD1/H3K4me2 and by METTL3-mediated m6A modification, which enhances YTHDF1-dependent translation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDC25B is a dual-specificity phosphatase that triggers mitotic entry by removing the inhibitory Thr-14/Tyr-15 phosphates from CDK1, acting as the 'starter phosphatase' for the G2/M transition [#0, #4]. Catalysis proceeds through a two-step phospho-cysteine intermediate mechanism, with the protein substrate itself supplying the catalytic acid for leaving-group protonation [#1, #8]. Functionally, CDC25B specifically activates cyclin B1-CDK1 at centrosomes, and its loss causes G2 delay; its catalytic activity is also required for normal centrosomal gamma-tubulin recruitment and centriole/centrosome duplication [#21, #28, #27]. Genetic studies establish a non-redundant requirement in female meiosis—Cdc25b-null oocytes arrest in prophase with low MPF and are rescued by Cdc25b mRNA—whereas in somatic cells Cdc25A compensates for combined loss of Cdc25B and Cdc25C [#11, #23]. CDC25B activity, localization, and abundance are tightly controlled: activating phosphorylation by Aurora-A (Ser-353), CK2 (Ser-186/187), and RSK promotes mitotic entry [#16, #13, #39], while CHK1 (Ser-230) and the phosphatase Cdc14A impose inhibitory control [#24, #35]. 14-3-3 binding to Ser-323 and cooperating low-affinity sites (Ser-151/230/309) forms an intramolecular bridge that blocks catalytic-site and nuclear-export-sequence access, sequestering CDC25B in the cytoplasm; checkpoint bypass follows disruption of this interaction [#9, #14, #17]. Nucleo-cytoplasmic shuttling is governed by defined NES and NLS elements together with PLK1-driven nuclear import, and PKA-mediated Ser-321 phosphorylation maintains 14-3-3-dependent cytoplasmic sequestration to enforce meiotic prophase arrest [#6, #18, #31, #30]. CDC25B is degraded constitutively by SCF-β-TrCP via a non-phosphorylated DDG motif and in a CDK1-cyclin A-dependent proteasomal manner, with stress kinases (JNK/p38 via Ser-101) and MEK1 also driving its destabilization [#19, #3, #33, #32]. Independently of its phosphatase activity, CDC25B acts as a ligand-dependent coactivator of steroid receptors through direct protein interaction [#10]. Its expression is further controlled by p53-mediated transcriptional repression, LSD1/H3K4me2 epigenetic repression in oocytes, and METTL3-deposited m6A that enhances YTHDF1-dependent translation [#36, #43, #45].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established what CDC25B does enzymatically by showing it dephosphorylates the inhibitory residues of CDK1, defining it as an activating mitotic phosphatase.\",\n      \"evidence\": \"In vitro dephosphorylation of CDK1 with purified CDC25B\",\n      \"pmids\": [\"8440392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro substrate specificity did not address in vivo timing or compartmentalized action\", \"Did not distinguish CDC25B from CDC25A/C roles\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined the catalytic mechanism, showing CDC25B uses a phospho-cysteine intermediate typical of dual-specificity phosphatases.\",\n      \"evidence\": \"Pre-steady-state kinetics with OMFP and recombinant catalytic domain\",\n      \"pmids\": [\"8910325\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Used small-molecule substrate, not the physiological CDK substrate\", \"Did not resolve the source of the catalytic acid\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated CDC25B is required for mitotic entry but not DNA replication, framing it as a G2-peaking 'starter phosphatase'.\",\n      \"evidence\": \"Neutralizing antibody microinjection plus activity assays in synchronized cells\",\n      \"pmids\": [\"9683638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not localize the relevant pool of CDC25B\", \"Mechanism of S-phase activating phosphorylation not identified\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed CDC25B drives premature mitosis overriding the unreplicated-DNA checkpoint and is cytoplasmic via cyclin B1-dependent nuclear export, distinguishing it from CDC25C.\",\n      \"evidence\": \"Time-lapse imaging and GFP-chimera localization in synchronized cells\",\n      \"pmids\": [\"10444066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Export machinery and signals not yet mapped\", \"Functional consequence of cytoplasmic pool unclear\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Mapped the NLS, NES, and 14-3-3 (Ser-323) requirement controlling regulated nucleo-cytoplasmic shuttling.\",\n      \"evidence\": \"Deletion/point mutants, leptomycin B, fractionation and immunofluorescence; two-hybrid 14-3-3 binding mapping\",\n      \"pmids\": [\"10822367\", \"10713667\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation-independence of 14-3-3 binding was a single-lab claim\", \"Did not show how 14-3-3 affects catalysis\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined 14-3-3 as a direct activity brake (blocking substrate access) and uncovered a phosphatase-independent coactivator function for steroid receptors.\",\n      \"evidence\": \"Checkpoint bypass and activity assays with 14-3-3 mutants; GST-pulldown, two-hybrid and reporter assays for receptor coactivation\",\n      \"pmids\": [\"11466620\", \"11689696\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of catalytic-site occlusion not resolved\", \"Physiological relevance of coactivator role to cell-cycle function unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Established CDC25B as the indispensable CDK1 activator for female meiotic resumption.\",\n      \"evidence\": \"Cdc25b knockout mice with mRNA-injection rescue and MPF assays\",\n      \"pmids\": [\"11912493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Somatic redundancy not yet addressed\", \"Upstream control in oocytes not defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified opposing post-translational inputs—CK2 (Ser-186/187, activating) and PKB/Akt (Ser-353, cytoplasmic export)—and refined the 14-3-3 intramolecular bridge model (Ser-151/230/323).\",\n      \"evidence\": \"In vitro kinase assays, mass spectrometry, co-IP, localization and activity assays\",\n      \"pmids\": [\"12527891\", \"14630392\", \"12764136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab site assignments\", \"Integration of multiple phospho-inputs in vivo not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placed CDC25B in centrosomal G2/M signaling through Aurora-A phosphorylation at Ser-353 and refined isoform-selective 14-3-3 control of localization (Ser-309).\",\n      \"evidence\": \"In vitro kinase assays, RNAi, phospho-antibody microinjection, phosphomimetics, 14-3-3 isoform co-expression\",\n      \"pmids\": [\"15128871\", \"16082213\", \"15173315\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crosstalk among Ser-353 kinases (Aurora-A vs Akt) not reconciled\", \"Centrosomal substrate spectrum undefined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the destruction and redox control of CDC25B—SCF-β-TrCP via a non-phospho DDG motif, and structural disulfide-based oxidative inactivation—and pinned its centrosomal cyclin B1-CDK1 activation to mitotic onset.\",\n      \"evidence\": \"Xenopus extract degradation assays; multi-state crystal structures; RNAi with quantitative live imaging and CDK activity assays; pEg3 Ser-169 mapping\",\n      \"pmids\": [\"15845771\", \"15807524\", \"16216921\", \"15908796\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of oxidation states uncertain\", \"Coupling of degradation to checkpoint signaling incomplete\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated somatic redundancy: Cdc25A compensates for combined Cdc25B/Cdc25C loss.\",\n      \"evidence\": \"Double-knockout mouse genetics with cell-cycle and checkpoint profiling\",\n      \"pmids\": [\"15767688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address tissue-specific non-redundant contexts beyond oocytes\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified CHK1 (Ser-230) as a constitutive negative regulator of centrosomal CDC25B and placed CDC25B downstream of CHK1 in coordinating chromatin condensation with spindle assembly; mapped stress-kinase sites (MK2, p38).\",\n      \"evidence\": \"In vitro kinase assays, mass spectrometry, phospho-antibody localization, gain-of-function mutants, CHK1-inhibitor epistasis\",\n      \"pmids\": [\"17003105\", \"17106257\", \"16861915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How constitutive CHK1 signaling is integrated with activating inputs at centrosomes unclear\", \"Functional weight of individual stress-kinase sites not separated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended CDC25B function to centrosome biology—asymmetric mother-centrosome localization, centriole duplication, and phosphatase-dependent gamma-tubulin recruitment.\",\n      \"evidence\": \"Immunofluorescence, siRNA, catalytic-dead and inducible overexpression with gamma-tubulin readouts; FRET biosensors and degradation-motif mapping\",\n      \"pmids\": [\"18235220\", \"18089784\", \"17599046\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct centrosomal substrates not identified\", \"Single-lab findings for centrosome duplication role\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined PKA-mediated Ser-321 phosphorylation as the mechanism sequestering CDC25B in the cytoplasm via 14-3-3 to maintain meiotic prophase arrest.\",\n      \"evidence\": \"In vitro PKA assay, oocyte microinjection/GVBD, 14-3-3 co-IP, phospho-antibodies\",\n      \"pmids\": [\"19223768\", \"19035343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between Ser-321 and Ser-323 14-3-3 control not fully resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Expanded the regulatory network with activating (RSK, PLK1-driven import) and destabilizing (JNK/p38 via Ser-101, MEK1) inputs and an oncogenic rapamycin→CDC25B(Ser-375)→AKT axis.\",\n      \"evidence\": \"In vitro kinase assays, mutagenesis, pharmacological/genetic epistasis, phosphoproteomics and rescue assays\",\n      \"pmids\": [\"19185590\", \"19638579\", \"19801682\", \"19276368\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab pathway assignments\", \"Hierarchy among competing kinase inputs in vivo undefined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Cdc14A as a direct phosphatase that dephosphorylates and inhibits CDC25B to restrain mitotic entry.\",\n      \"evidence\": \"Co-IP, in vitro dephosphorylation/activity assays, overexpression/knockdown with CDK1-cyclin B1 readout\",\n      \"pmids\": [\"20956543\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding\", \"Specific Cdc14A target residues on CDC25B not mapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed CDC25B controls G2 length and influences neurogenesis in vivo, linking its cell-cycle role to developmental cell-fate decisions.\",\n      \"evidence\": \"In vivo RNAi in chick spinal cord with phase-length and differentiation readouts; p53 promoter-repression mapping\",\n      \"pmids\": [\"22318230\", \"21242964\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting G2 length to neuronal conversion unclear\", \"Single-lab developmental finding\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Clarified redox- and signaling-based activity control: SelW reduces the disulfide to release 14-3-3 and activate CDC25B; cAMP/PKA (MC1R) and 14-3-3ε (Ser-321) inhibit it.\",\n      \"evidence\": \"siRNA epistasis with 14-3-3 binding assays; MC1R/cAMP rescue with S323A; co-IP and GVBD rescue with 14-3-3ε mutants\",\n      \"pmids\": [\"22982242\", \"23908401\", \"23326474\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological redox triggers of SelW action uncertain\", \"Single-lab mechanistic claims\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established epigenetic control of CDC25B levels: LSD1/H3K4me2 represses CDC25B transcription in oocytes, with CDC25B upregulation responsible for precocious CDK1 activation and oocyte failure.\",\n      \"evidence\": \"Conditional Lsd1 oocyte knockout, H3K4me2 ChIP, CDC25B quantification and rescue\",\n      \"pmids\": [\"26626423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability beyond oocytes not shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed all seven 14-3-3 isoforms interact with CDC25B in oocytes but that single deletion of YWHAH or YWHAE is dispensable for meiotic arrest, indicating functional redundancy among isoforms.\",\n      \"evidence\": \"Proximity ligation assay, FRET, R18 peptide injection, single-isoform knockouts\",\n      \"pmids\": [\"31640562\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Combinatorial isoform requirement not determined\", \"Per-isoform site preferences in oocytes not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified m6A-based translational control of CDC25B, with METTL3 deposition and YTHDF1 reading accelerating its translation to drive G2/M progression.\",\n      \"evidence\": \"meRIP-qPCR/m6A-seq, METTL3 and YTHDF1 knockdown, ribosome profiling and cell-cycle analysis\",\n      \"pmids\": [\"35637959\", \"35287752\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Spatial/temporal coupling of m6A control to mitotic timing unresolved\", \"Specific m6A sites on CDC25B mRNA not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many competing activating, inhibitory, localization, and degradation inputs are quantitatively integrated to produce a switch-like, spatially controlled CDC25B activation at centrosomes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model reconciles the multiple kinases targeting overlapping residues (e.g., Ser-353, Ser-323)\", \"Centrosomal substrate(s) beyond CDK1 not identified\", \"Tissue-specific essentiality outside oocytes not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 8, 21, 42]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 15, 17, 18, 30]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 6, 18, 31]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [16, 21, 22, 24, 27, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 4, 5, 21]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [11, 30, 43]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [45]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CDK1\", \"CDK2\", \"YWHAB\", \"YWHAE\", \"YWHAH\", \"CSNK2B\", \"CDC14A\", \"AURKA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":9,"faith_pct":88.88888888888889}}