{"gene":"CPEB1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":1994,"finding":"CPEB (CPEB1) was identified as a sequence-specific RNA-binding protein required for cytoplasmic polyadenylation of CPE-containing maternal mRNAs in Xenopus oocytes. Immunodepletion of CPEB from polyadenylation-competent egg extracts abolished cytoplasmic polyadenylation; addition of recombinant CPEB partially restored activity. CPEB contains two RNA recognition motifs (RRMs) and is phosphorylated during oocyte maturation at a time corresponding with induction of polyadenylation.","method":"RNA affinity chromatography, immunodepletion, in vitro polyadenylation reconstitution, cDNA cloning","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with immunodepletion and add-back, replicated across multiple subsequent studies","pmids":["7954828"],"is_preprint":false},{"year":1996,"finding":"CPEB binds CPE sequences in the 3' UTRs of cyclin A1, B1, B2, cdk2, c-mos, and G10 mRNAs and is necessary for cytoplasmic polyadenylation of these mRNAs in egg extracts. Injection of CPEB antibody into oocytes inhibits polyadenylation and translational activation of c-mos mRNA and blocks progesterone-induced meiotic maturation.","method":"In vitro polyadenylation assay with egg extracts, antibody injection into oocytes, immunoprecipitation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution plus in vivo antibody inhibition, multiple orthogonal methods","pmids":["8665866"],"is_preprint":false},{"year":1998,"finding":"Both RRM domains and a cysteine-histidine zinc finger region of CPEB are essential for RNA binding. Deletion of either RRM greatly reduces RNA binding; deletion of the zinc finger abolishes it. Single alanine substitutions of specific cysteines or histidines within the zinc finger also abolish RNA binding. CPEB binds RNA as a monomer; zinc chelation inhibits binding and zinc supplementation restores it.","method":"E. coli overexpression of deletion/point mutants, RNA gel-shift assays, metal chelation/supplementation experiments","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis with multiple deletion and point mutations tested by in vitro RNA binding assay","pmids":["9447964"],"is_preprint":false},{"year":1998,"finding":"CPEB is present in dendritic layers of hippocampus, at synapses in cultured neurons, and in postsynaptic densities. CPEB binds CPE sequences in the 3' UTR of alpha-CaMKII mRNA, and these CPEs mediate polyadenylation-induced translation in Xenopus oocytes. In the intact brain, visual experience induces alpha-CaMKII mRNA polyadenylation and translation.","method":"Immunohistochemistry, postsynaptic density fractionation, RNA injection into Xenopus oocytes, in vivo polyadenylation assay","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — subcellular fractionation, functional oocyte injection assay, and in vivo polyadenylation, replicated by subsequent studies","pmids":["9856468"],"is_preprint":false},{"year":2000,"finding":"CPEB and maskin colocalize with cyclin B1 mRNA at the mitotic apparatus (spindle/centrosome) of Xenopus blastomeres. CPEB interacts with microtubules and is required for localization of cyclin B1 mRNA to the mitotic apparatus. Agents disrupting polyadenylation-induced translation inhibit cell division and cause spindle and centrosome defects.","method":"Immunofluorescence/colocalization, injection of translation inhibitory agents, RNA localization assays in embryos","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments tied to functional cell division phenotype, multiple orthogonal approaches","pmids":["11081630"],"is_preprint":false},{"year":2000,"finding":"Eg2 (Aurora A) kinase phosphorylates CPEB serine 174, and this phosphorylation event is the most proximal stimulus for cytoplasmic polyadenylation. Phosphorylated CPEB directly recruits CPSF (via its 160 kDa subunit) into an active polyadenylation complex. This interaction does not require RNA tethering. Cytoplasmic polyadenylation was reconstituted in vitro with purified components.","method":"In vitro kinase assay, co-immunoprecipitation, in vitro polyadenylation reconstitution with purified components","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified components plus direct biochemical demonstration of phosphorylation-dependent protein-protein interaction","pmids":["11106762"],"is_preprint":false},{"year":2001,"finding":"CPEB knockout female mice have vestigial ovaries devoid of oocytes; oocytes arrest at pachytene in both male and female knockout embryos. Two synaptonemal complex protein mRNAs containing CPEs interact with CPEB in vitro and in vivo, have shortened poly(A) tails, and fail to associate with polysomes in null mice. Synaptonemal complexes are absent in knockout animals, establishing that CPEB controls germ cell differentiation by regulating synaptonemal complex protein mRNA translation.","method":"Knockout mouse, polysome fractionation, RNA co-immunoprecipitation, electron microscopy for synaptonemal complex","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined molecular mechanism (polysome association of target mRNAs) and structural phenotype, multiple methods","pmids":["11702780"],"is_preprint":false},{"year":2001,"finding":"In mouse oocytes, the murine Aurora A homolog IAK1/Eg2 phosphorylates CPEB on the critical regulatory residue, and this is essential for cytoplasmic polyadenylation and meiotic progression. A dominant-negative non-phosphorylatable CPEB prevents polyadenylation. IAK1/Eg2 inhibitory peptide blocks meiotic progression in injected oocytes.","method":"Immunohistochemistry in mouse oocytes, injection of IAK1/Eg2-inhibitory peptide, dominant-negative CPEB injection","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — dominant-negative mutagenesis plus kinase inhibitor in a mammalian model, two orthogonal approaches","pmids":["11526086"],"is_preprint":false},{"year":2001,"finding":"CPEB degradation during Xenopus oocyte maturation requires a 14 amino acid PEST domain and occurs via the ubiquitin-proteasome pathway. Approximately 75% of CPEB is degraded coincident with germinal vesicle breakdown; proteasome and ubiquitination inhibitors block this degradation.","method":"Proteasome/ubiquitin inhibitor treatment, CPEB PEST domain deletion analysis, metabolic labeling to measure synthesis vs. accumulation","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — pharmacological inhibitors plus domain mapping, multiple methods in single study","pmids":["11237472"],"is_preprint":false},{"year":2002,"finding":"NMDA receptor activation at hippocampal synapses triggers Aurora kinase phosphorylation of CPEB, which is required for cytoplasmic polyadenylation and translation of alpha-CaMKII mRNA at synaptic sites. All polyadenylation machinery components (CPEB, maskin, PAP, CPSF, Aurora) are present at synapses.","method":"Immunofluorescence/colocalization at synapses, NMDA stimulation with phosphorylation assay, synaptic fractionation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct demonstration of signaling cascade from NMDA receptor to CPEB phosphorylation and polyadenylation at synapses, replicated in subsequent studies","pmids":["11980711"],"is_preprint":false},{"year":2002,"finding":"Cdc2-mediated phosphorylation of CPEB via a PEST box triggers partial CPEB destruction by the proteasome during metaphase I in Xenopus oocytes. This partial destruction is required for the temporal activation of cyclin B1 mRNA polyadenylation (at metaphase I, after Mos mRNA) and for meiotic progression to metaphase II. CPEB destruction is also required for mitosis in early embryos.","method":"In vivo phosphorylation analysis, proteasome inhibition, CPEB PEST domain mutagenesis, mRNA polyadenylation time-course assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of PEST domain plus kinase inhibition plus in vivo polyadenylation assay, multiple orthogonal methods","pmids":["11927567"],"is_preprint":false},{"year":2003,"finding":"CPEB facilitates mRNA transport to dendrites via RNA-containing particles that move in a microtubule-dependent manner (4–8 µm/min). CPEB-GFP particles contain maskin, dynein, and kinesin. The CPE is sufficient for dendritic targeting; a CPEB mutant defective for motor interaction inhibits transport; in CPEB knockout neurons, dendritic transport of a CPE-containing reporter RNA is reduced.","method":"Live imaging of CPEB-GFP particles in rat hippocampal neurons, motor protein co-immunoprecipitation, CPEB knockout neurons, recombinant virus-mediated CPE reporter transport assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — live imaging with functional mutant and knockout validation, multiple orthogonal methods","pmids":["12629046"],"is_preprint":false},{"year":2004,"finding":"Symplekin and xGLD-2 are essential factors for CPEB-mediated cytoplasmic polyadenylation in Xenopus oocytes. Symplekin serves as a scaffold that binds both CPEB and CPSF. xGLD-2, an atypical poly(A) polymerase, is anchored to CPEB and CPSF even before polyadenylation begins.","method":"Co-immunoprecipitation, biochemical fractionation, functional depletion assays in Xenopus egg extracts","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IPs plus functional depletion reconstitution in Xenopus extracts, multiple orthogonal methods","pmids":["15550246"],"is_preprint":false},{"year":2004,"finding":"Progesterone and insulin both stimulate Aurora A (Eg2)-catalyzed CPEB serine 174 phosphorylation and cytoplasmic polyadenylation; the insulin pathway acts through PI3K/PKC-zeta upstream of Aurora A. The intersection of progesterone and insulin pathways occurs at GSK-3, which inhibits Aurora A by phosphorylating it on S290/291. GSK-3-phosphorylated Aurora A has reduced capacity to phosphorylate CPEB; constitutively active Aurora A (S290/291A) rescues polyadenylation.","method":"In vitro kinase assay, GSK-3/Aurora A co-immunoprecipitation, Aurora A mutagenesis (S290/291A, S290/291D), PI3K/PKC inhibitors in oocytes","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assays with site-specific mutants plus signaling pathway epistasis, two orthogonal approaches","pmids":["14724178"],"is_preprint":false},{"year":2005,"finding":"All mammalian CPEB1 isoforms associate with stress granules and dcp1 bodies in the cytoplasm; this association requires the RNA-binding ability of CPEB1, while the Aurora A phosphorylation site is dispensable. Transient CPEB1 overexpression induces assembly of stress granules, which then recruit dcp1 bodies. rck/p54 DEAD-box protein (a known CPEB partner) is present in both structures.","method":"Immunofluorescence, CPEB1 RNA-binding mutant analysis, transient transfection/overexpression assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — colocalization with RNA-binding domain requirement demonstrated, single lab with two approaches","pmids":["15731006"],"is_preprint":false},{"year":2006,"finding":"CPEB knockout mouse embryo fibroblasts (MEFs) fail to undergo senescence in culture and are immortal; exogenous CPEB restores senescence. CPEB cannot stimulate senescence when p53, p19ARF, or p16INK4A are absent. CPEB acts as a translational repressor of c-myc mRNA; unregulated Myc translation in CPEB-null MEFs may cause bypass of senescence. Ras cannot induce senescence in MEFs lacking CPEB.","method":"CPEB knockout MEFs, reintroduction of exogenous CPEB, genetic epistasis with p53/p19ARF/p16 knockout, polysome fractionation for c-myc mRNA","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with add-back rescue, epistasis with tumor suppressors, multiple orthogonal methods","pmids":["17015432"],"is_preprint":false},{"year":2006,"finding":"RINGO/Spy mRNA translation is required upstream of CPEB-directed polyadenylation in Xenopus oocytes. Pumilio 2 (Pum2) binds Pumilio-Binding Elements in the RINGO/Spy 3' UTR and represses its translation in immature oocytes; this repression also involves XDAZL and ePAB. After induction of maturation, Pum2 dissociates from RINGO/Spy mRNA, allowing RINGO/Spy synthesis, which is then required for CPEB activation. Pum2 co-immunoprecipitates with XDAZL and ePAB.","method":"mRNA reporter assays, deletion analysis of 3' UTR, co-immunoprecipitation, mRNA injection into oocytes","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — epistasis established by RNA reporter assay, co-IP, and deletion analysis; positions RINGO upstream of CPEB","pmids":["16418484"],"is_preprint":false},{"year":2007,"finding":"CPEB in early Xenopus oocytes interacts (protein-protein) with Xp54 RNA helicase, P100/Pat1, RAP55, the eIF4E-binding protein 4E-T, and an oocyte-specific eIF4E isoform (eIF4E1b) — but not with eIF4E1a, eIF4G, or the late-oogenesis factors maskin, PARN, or 4E-BP1. eIF4E1b binds m7GTP weakly and associates with 4E-T (not eIF4G). Tethered 4E-T or eIF4E1b represses translation in a cap-dependent manner. Injection of eIF4E1b antibody accelerates meiotic maturation.","method":"Co-immunoprecipitation, gel filtration, pulldown assays, cap-binding assay, tethered reporter translation assay, antibody injection into oocytes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus functional tethered reporter assay plus in vivo antibody injection, multiple methods","pmids":["17942399"],"is_preprint":false},{"year":2007,"finding":"ePAB (embryonic poly(A)-binding protein) transiently associates with the CPEB polyadenylation complex; it initially interacts with CPEB, then shifts to bind the poly(A) tail after polyadenylation. Dissociation of ePAB from CPEB is regulated by RINGO/cdk1, which phosphorylates CPEB. Poly(A)-bound ePAB interacts with eIF4G to initiate translation of CPEB-bound mRNAs.","method":"Co-immunoprecipitation, in vitro kinase assay, poly(A) tail protection assays, translation initiation complex analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP showing dynamic complex remodeling tied to kinase activity and translation initiation, two orthogonal methods","pmids":["17938241"],"is_preprint":false},{"year":2007,"finding":"CPEB degradation during Xenopus oocyte maturation is mediated by the SCF(beta-TrCP) E3 ubiquitin ligase. beta-TrCP binds a TSG motif (residues 190–195) of CPEB. This binding requires phosphorylation of Thr-190, Ser-191, and Ser-195; Ser-191 is phosphorylated by Polo-like kinase Plx1, which itself binds CPEB at Thr-125 pre-phosphorylated by Cdc2. Cdc2-mediated phosphorylation of multiple Ser residues is required for Thr-125 phosphorylation and beta-TrCP binding.","method":"In vitro kinase assays (Cdc2, Plx1), co-immunoprecipitation, site-directed mutagenesis of TSG motif, ubiquitin-proteasome pathway assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical reconstitution of sequential kinase steps with mutagenesis, multiple orthogonal methods","pmids":["17986610"],"is_preprint":false},{"year":2007,"finding":"MAPK is required for early CPEB phosphorylation in Xenopus oocytes during meiotic resumption. MAPK directly phosphorylates CPEB on four residues (T22, T164, S184, S248) but not on S174 (the Aurora A site). XGef (a Rho-GEF) co-immunoprecipitates with MAPK, and this complex can phosphorylate CPEB.","method":"Kinase inhibitors (U0126 for MAPK; ZM447439 for Aurora A/B), in vitro MAPK phosphorylation of CPEB, co-immunoprecipitation of XGef-MAPK complex","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay identifying phosphorylation sites plus pharmacological epistasis, two orthogonal methods","pmids":["17344432"],"is_preprint":false},{"year":2008,"finding":"CPEB-regulated translation is essential for cellular senescence of human diploid fibroblasts. CPEB knockdown allows cells to bypass senescence (M1 crisis). Knockdown cells have fewer mitochondria, reduced respiration and ROS, normal ATP, and enhanced glycolysis (Warburg-like phenotype). CPEB promotes polyadenylation of p53 mRNA 3' UTR CPEs; CPEB-depleted cells have shortened p53 poly(A) tails and ~50% reduced p53 protein, and a ~50% shRNA-mediated reduction in p53 also extends cellular lifespan.","method":"CPEB shRNA knockdown in human fibroblasts, add-back rescue, poly(A) tail length assay, polysome fractionation, mitochondria counting, respirometry","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockdown with add-back rescue plus molecular mechanism (p53 mRNA polyadenylation), multiple orthogonal methods","pmids":["19141477"],"is_preprint":false},{"year":2008,"finding":"CPEB-1 controls translation of c-Jun mRNA through CPEs in its 3' UTR; reduced c-Jun leads to lower GH transcription and reduced GH signaling (phospho-JAK2/phospho-STAT3) in CPEB-1 knockout hippocampus. CPEB-1 co-immunoprecipitates c-Jun RNA in vivo and binds c-Jun 3' UTR CPEs in vitro. Growth hormone restores LTP in hippocampal slices from WT but not KO mice with reduced magnitude.","method":"CPEB-1 knockout mice, proteomics comparison, co-immunoprecipitation of RNA, in vitro CPE binding assay, electrophysiology (LTP), pharmacological polyadenylation inhibition","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — knockout combined with in vivo RNA co-IP and in vitro binding, multiple orthogonal methods","pmids":["18716208"],"is_preprint":false},{"year":2008,"finding":"CPEB RNA-binding protein regulates beta-catenin mRNA translation in astrocytes via a CPE in the beta-catenin 3' UTR. A dominant-negative CPEB blocks beta-catenin localization to the leading edge of migrating astrocytes and inhibits directed cell migration.","method":"In vitro wound-healing assay, dominant-negative CPEB expression, identification of CPE in beta-catenin 3' UTR, immunofluorescence","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — dominant-negative phenotype plus 3' UTR CPE identification, single lab, two methods","pmids":["18618654"],"is_preprint":false},{"year":2008,"finding":"CPEB1 shuttles between nucleus and cytoplasm via the CRM1-dependent export pathway and in the nucleus associates with lampbrush chromosomes in Xenopus oocytes and with proteins involved in nuclear RNA processing. CPEB interacts with Maskin in the nucleus and with CPE-containing mRNAs. CPEB also directly or indirectly mediates alternative splicing of at least one pre-mRNA.","method":"Leptomycin B-mediated CRM1 inhibition, nuclear fractionation, immunofluorescence on lampbrush chromosomes, RNA immunoprecipitation, alternative splicing assays","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRM1-dependent export demonstrated pharmacologically, nuclear localization and RNA association shown by multiple methods","pmids":["20040591"],"is_preprint":false},{"year":2008,"finding":"CPEB1 accumulates in Crm1 nucleolar bodies (CNoBs) in the nucleus; export depends on two redundant NES motifs recognized by Crm1. CNoBs depend on RNA polymerase I activity. CPEB1 continuously shuttles between nucleus and cytoplasm.","method":"Crm1 inhibition (leptomycin B), NES mutagenesis, Pol I inhibition, live imaging, immunofluorescence","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — NES mutagenesis plus pharmacological inhibition identifies export mechanism and nuclear localization, single lab","pmids":["18923137"],"is_preprint":false},{"year":2010,"finding":"CPEB1 and CPEB4 are required for mitotic cell-cycle progression; loss of both causes defective entry into M phase in mitotically dividing somatic cells. Phase-specific changes in poly(A) tail length of target mRNAs mediated by CPEB1 and CPEB4 are required for cell proliferation, extending the cytoplasmic polyadenylation mechanism to general mitotic regulation.","method":"RNAi knockdown of CPEB1/CPEB4, poly(A) tail length assays, cell cycle analysis by FACS in mitotically dividing cells","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean knockdown with cell cycle phenotype and poly(A) tail measurement, two orthogonal methods","pmids":["20364142"],"is_preprint":false},{"year":2010,"finding":"CPEB1 activates translation of CPEB4 mRNA, generating a positive translational loop during meiosis. CPEB1 is degraded during the first meiotic division; CPEB4 then replaces CPEB1 and drives the metaphase I to metaphase II transition. CPEB1 and CPEB4 are differentially regulated by phase-specific kinases.","method":"In vivo poly(A) tail length assays, reporter translation assays, in vivo CPEB1/CPEB4 expression analysis during meiotic progression","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — poly(A) tail measurement plus reporter assays establish CPEB1→CPEB4 translational cascade, two methods","pmids":["20531391"],"is_preprint":false},{"year":2011,"finding":"CPEB controls IL-6 production at both translational and transcriptional levels in MEFs; CPEB-deficient cells produce large amounts of IL-6 due to improper NF-κB p65 phosphorylation and nuclear retention. IL-6-promoted senescence requires p53; CPEB knockout MEFs produce only ~50% of p53 protein and cannot respond to IL-6 for senescence.","method":"CPEB knockout MEFs, NF-κB nuclear localization assay, IL-6 ELISA, p65 phosphorylation analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — knockout phenotype with NF-κB localization analysis, single lab, limited reconstitution","pmids":["21536657"],"is_preprint":false},{"year":2011,"finding":"CPEB depletion surprisingly promotes p53 mRNA polyadenylation/translation and premature senescence in fibroblasts through a miR-122/CPEB/Gld4 axis. Gld2 depletion destabilizes miR-122 (which has two binding sites in the CPEB 3' UTR), thereby elevating CPEB mRNA translation. A second poly(A) polymerase, Gld4, mediates p53 mRNA polyadenylation/translation in a CPEB-dependent manner.","method":"siRNA depletion, poly(A) tail length assay, antagomir of miR-122, 3' UTR reporter assays, cellular senescence assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple siRNA depletions with poly(A) assay and reporter validation, two orthogonal mechanistic approaches","pmids":["21478871"],"is_preprint":false},{"year":2012,"finding":"CPEB1 shuttles to the nucleus where it co-localizes with splicing factors and mediates shortening of hundreds of mRNA 3' UTRs (alternative polyadenylation). CPEB1 binding to pre-mRNAs directs use of alternative polyadenylation sites and alters alternative splicing by preventing U2AF65 recruitment. CPEB1-mediated 3' UTR shortening correlates with cell proliferation and tumorigenesis.","method":"Nuclear-cytoplasmic fractionation, immunofluorescence with splicing factor markers, RNA-seq, 3' end sequencing, U2AF65 co-immunoprecipitation, reporter assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide 3' end sequencing plus mechanistic follow-up with U2AF65 co-IP and reporter assays, multiple orthogonal methods","pmids":["23434754"],"is_preprint":false},{"year":2012,"finding":"CPEB mediates apical localization of ZO-1 mRNA in mammary epithelial cells through CPE binding sites in the ZO-1 3' UTR. CPEB depletion disrupts ZO-1 apical localization, tight-junction distribution, and lumen formation in 3D culture. Rescue with ZO-1 mRNA containing CPEB-binding sites (but not without) restores cavity formation.","method":"RNAi knockdown, ectopic CPEB expression, 3D mammary culture, immunofluorescence, RNA localization by FISH, rescue with wild-type vs. CPE-mutant ZO-1 mRNA","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockdown/rescue with CPE-binding site mutagenesis establishing causal mechanism, multiple methods","pmids":["22334078"],"is_preprint":false},{"year":2013,"finding":"FMRP and CPEB1 maintain translational homeostasis at the level of polypeptide elongation. Fmr1(-/y); Cpeb1(-/-) double-knockout mice show amelioration of biochemical, morphological, electrophysiological, and behavioral phenotypes of Fragile X syndrome. Acute hippocampal depletion of CPEB1 in adult Fmr1(-/y) mice rescues working memory deficits.","method":"Double knockout mice, behavioral testing, electrophysiology, western blot, acute CPEB1 knockdown in adult mice","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in double-knockout plus acute adult rescue, multiple phenotypic readouts","pmids":["24141422"],"is_preprint":false},{"year":2014,"finding":"Solution structures of the tandem RRMs of human CPEB1 (and CPEB4) in free and RNA-bound states reveal an unprecedented RRM arrangement in the free state that undergoes a closure motion upon RNA binding for high-fidelity CPE recognition. The ZZ (zinc-binding) domain of CPEB1 contributes to both protein-protein and protein-RNA interactions, enabling optimal positioning of N-terminal and ZZ domains for ribonucleoprotein complex nucleation at 3' UTRs.","method":"Solution NMR structure determination of free and RNA-bound RRMs, functional mutagenesis of ZZ domain, binding assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — solution NMR structures in free and RNA-bound states with functional validation by mutagenesis, structurally rigorous","pmids":["24990967"],"is_preprint":false},{"year":2014,"finding":"CPEB regulates translation of TAK1 mRNA in macrophages; CPEB-depleted macrophages have elevated TAK1 protein, leading to prolonged NF-κB nuclear retention and high IL-6 production upon LPS stimulation. CPEB/TAK1 double depletion rescues elevated IL-6. CPEB knockout mice show LPS hypersensitivity with excess IL-6 and cytokines, which is mitigated by the TAK1 inhibitor oxozeaenol.","method":"CPEB KO mice, macrophage LPS stimulation, CPEB/TAK1 double depletion, NF-κB nuclear localization, IL-6 ELISA, TAK1 inhibitor in vivo","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double depletion, pharmacological rescue in vivo, multiple orthogonal methods","pmids":["25452303"],"is_preprint":false},{"year":2015,"finding":"CPEB1 depletion in mammary epithelial cells causes EMT and metastasis to the lung. CPEB1-depleted cells have MMP9 mRNA with a longer poly(A) tail and enhanced MMP9 translation. Ectopic CPEB1 prevents metastasis. CPEB1 mediates apical ZO-1 mRNA localization required for cell polarity, and loss of this polarity drives EMT.","method":"CPEB1 RNAi in mammary cells, mouse fat pad injection for in vivo metastasis, poly(A) tail assay for MMP9 mRNA, polysome fractionation, ectopic CPEB1 rescue","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo metastasis model plus poly(A) tail mechanism, multiple methods, single lab","pmids":["26411364"],"is_preprint":false},{"year":2015,"finding":"CPEB1 activation promotes alternative nuclear processing of VEGF and CPEB4 mRNAs (deleting translation repressor elements in their 3' UTRs). Subsequently, CPEB4 promotes cytoplasmic polyadenylation of VEGF mRNA, increasing its translation. CPEB1 or CPEB4 knockdown in mice prevents VEGF overexpression and pathologic mesenteric angiogenesis after portal vein ligation.","method":"siRNA knockdown, luciferase reporter assay, poly(A) tail assay, 3' RACE, Matrigel tube formation assay, CPEB-deficient mice with portal vein ligation","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reporter assays plus poly(A) tail analysis plus in vivo knockout mouse model, multiple orthogonal approaches","pmids":["26627607"],"is_preprint":false},{"year":2016,"finding":"Human CPEB1, when ectopically expressed in non-infected cells, recapitulates infection-related post-transcriptional changes (alternative splicing, 3' UTR shortening, poly(A) tail lengthening) caused by HCMV infection. CPEB1 is required for poly(A) tail lengthening of viral RNAs important for productive infection; CPEB1 depletion decreases productive HCMV titers and reverses infection-related cytopathology.","method":"CPEB1 ectopic expression, CPEB1 siRNA depletion, transcriptome-wide RNA-seq, poly(A) tail length assay, viral titer measurement","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ectopic expression recapitulates phenotype, knockdown reversal, transcriptome-wide analysis, multiple orthogonal methods","pmids":["27775709"],"is_preprint":false},{"year":2018,"finding":"CPEB1 directly binds the 3' UTR of SIRT1 mRNA (via CPE sites), controls its poly(A) tail length, and suppresses SIRT1 translation, thereby reducing hepatocellular carcinoma (HCC) cancer stemness. Site-directed mutagenesis of CPE sites in SIRT1 3' UTR confirmed direct CPEB1 targeting. CPEB1 overexpression reduced self-renewal and stemness markers in HCC in vitro and in vivo.","method":"Site-directed mutagenesis, luciferase reporter assay with SIRT1 3' UTR, RNA immunoprecipitation, poly(A) tail assay, orthotopic mouse model","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of CPE sites plus reporter assay plus RNA-IP, rigorous mechanistic dissection","pmids":["30237545"],"is_preprint":false},{"year":2021,"finding":"Mitotic spindles contain CPE-localized mRNAs and translating ribosomes. CPEB1 and CPEB4 both localize to mitotic spindles and function sequentially: CPEB1 controls metaphase and CPEB4 controls anaphase/cytokinesis by binding specific spindle-associated transcripts and controlling expression and/or localization of their encoded factors.","method":"RNA-FISH of spindle-associated mRNAs, immunofluorescence of CPEB1/CPEB4 at spindles, ribosome localization at spindles, RNAi knockdown with cell cycle staging","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional knockdown data, single lab","pmids":["33323527"],"is_preprint":false},{"year":2022,"finding":"CPEB1 regulates the translational landscape during muscle satellite cell (SC) quiescence-to-activation transition. Phosphorylation-dependent CPEB1 promotes MyoD1 (Myod1) protein synthesis by binding CPEs in the Myod1 3' UTR, driving SC activation and muscle regeneration.","method":"In vivo mouse perfusion fixation to isolate bona fide quiescent SCs, quantitative proteomics + transcriptomics, CPEB1 binding to Myod1 3' UTR CPEs, phosphorylation analysis, genetic mouse models of SC activation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — proteomics plus 3' UTR CPE binding with phosphorylation-dependent mechanism and in vivo genetic model, multiple orthogonal methods","pmids":["35177647"],"is_preprint":false},{"year":2022,"finding":"CPEB1 (but not CPEB2-4) forms ribonucleoprotein complexes that are remodeled upon a single phosphorylation event, and these complexes are associated with mRNAs containing canonical CPEs. All four CPEBs can recruit the CCR4-NOT deadenylation complex to repress translation. CPEB2-4 are regulated by multiple proline-directed phosphorylations that control liquid-liquid phase separation, distinguishing them mechanistically from CPEB1.","method":"Biochemical fractionation of RNP complexes, RNA-binding assays, phosphorylation analysis, phase separation assays, RNA-seq of target mRNAs","journal":"Genome biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — comprehensive comparative biochemical analysis of all four CPEBs with multiple orthogonal methods establishing differential mechanisms","pmids":["36096799"],"is_preprint":false},{"year":2003,"finding":"CPEB phosphorylation occurs at Thr-171 in mouse oocytes at embryonic day E16.5 (pachytene) and is dephosphorylated at E18.5 (diplotene) by the phosphatase PP1; phosphorylation is mediated by Aurora kinase. This temporal regulation of CPEB phosphorylation provides a mechanism for controlled activation of CPE-containing mRNA translation during meiosis.","method":"Phospho-specific antibody analysis of mouse oocytes at defined developmental stages, PP1 inhibitor and Aurora kinase inhibitor assays","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — phosphorylation analysis in vivo with phosphatase identification by inhibitor, single lab","pmids":["12815066"],"is_preprint":false},{"year":2006,"finding":"CPEB controls oocyte growth and follicle development in the mouse. Oocyte-specific CPEB knockdown causes parthenogenetic cell division, abnormal polar bodies, spindle anomalies, follicular apoptosis, and infertility. CPEB binds multiple oocyte mRNAs including Gdf9; in CPEB knockdown oocytes, Gdf9 mRNA has a shortened poly(A) tail and reduced expression.","method":"Zp3-promoter driven siRNA transgenic knockdown, poly(A) tail assay for Gdf9, immunofluorescence of spindles, CPEB RNA co-immunoprecipitation","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — oocyte-specific knockdown with poly(A) tail mechanism for target mRNA, multiple phenotypic and molecular assays","pmids":["17050619"],"is_preprint":false},{"year":2008,"finding":"Translational regulation of beta-catenin mRNA by CPEB1 is required for localization of beta-catenin to the leading edge of migrating astrocytes and for directed cell migration in an in vitro wound-healing assay. Reporter mRNA containing CPEB1-binding sites is transported to the leading edge of migrating glioblastoma cells; point mutations in the binding sites abolish leading-edge localization.","method":"In vitro wound-healing assay, dominant-negative CPEB1, CPE reporter mRNA localization with point mutations, immunofluorescence","journal":"Molecular cancer research: MCR","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — dominant-negative and CPE-mutant reporter showing mechanistic link between CPEB1 binding and mRNA localization/cell migration, single lab","pmids":["23360795"],"is_preprint":false},{"year":2012,"finding":"PKCε co-immunoprecipitates with CPEB in IB4-positive nociceptors, and CPEB is downstream of PKCε in the signaling cascade responsible for hyperalgesic priming. Antisense knockdown of CPEB prevents but does not reverse psiεRACK (PKCε agonist)-induced priming, establishing CPEB as required for priming induction.","method":"Co-immunoprecipitation of PKCε and CPEB, intrathecal antisense oligodeoxynucleotides, behavioral hyperalgesia assay","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single co-IP plus functional antisense knockdown establishing pathway position, single lab","pmids":["22323716"],"is_preprint":false},{"year":2016,"finding":"DAZL and CPEB1 synergistically regulate maternal mRNA translation during oocyte meiotic re-entry. Depletion of either DAZL or CPEB1 impairs ribosome loading onto target mRNAs (e.g., Tex19.1). Mutagenesis of DAZL-binding sites and CPEs in target 3' UTRs demonstrates that both proteins cooperate directly on the same mRNA. Genome-wide analysis confirms synergism between DAZL-binding sites and CPEs.","method":"Ribosome loading assay (polysome fractionation), oocyte depletion of DAZL and CPEB1, 3' UTR mutagenesis, genome-wide polysome analysis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide polysome analysis plus mutagenesis plus individual depletion, multiple orthogonal methods","pmids":["26826184"],"is_preprint":false},{"year":2023,"finding":"PATL2, an oocyte-specific RNA-binding protein, physically interacts with both EIF4E and CPEB1 to regulate maternal mRNA expression in immature oocytes. Patl2-/- germinal vesicle oocytes show reduced maternal mRNA expression and decreased protein synthesis. PATL2 phosphorylation at S279 is identified during oocyte maturation and S279D mutation decreases PATL2 protein levels via ubiquitin-mediated proteasomal degradation.","method":"Co-immunoprecipitation of PATL2-EIF4E-CPEB1, Patl2 knockout oocytes, phosphoproteomics, knock-in mouse model, ubiquitin-proteasome pathway analysis","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP identifying CPEB1 complex partner plus knockout phenotype, single lab","pmids":["37218508"],"is_preprint":false}],"current_model":"CPEB1 is a sequence-specific RNA-binding protein that binds CPE (UUUUUAU) sequences in the 3' UTRs of target mRNAs via tandem RRMs and a zinc finger (ZZ) domain, nucleating a large ribonucleoprotein complex (including CPSF, symplekin, GLD-2 poly(A) polymerase, PARN deadenylase, maskin/eIF4E-binding proteins, and ePAB) to control cytoplasmic polyadenylation-induced translational activation; CPEB1 activity is switched on by Aurora A (Eg2/IAK1)-catalyzed phosphorylation of Ser-174 (which recruits CPSF), is temporally regulated by additional kinases (Cdc2, MAPK, Plx1) and phosphatases (PP1), and is terminated by SCF(beta-TrCP)-mediated proteasomal degradation; beyond meiosis, CPEB1 operates in somatic cells to regulate cell-cycle progression (mitosis), cellular senescence (via p53 and Myc mRNA translation), epithelial polarity (ZO-1 mRNA apical localization), immune responses (TAK1/IL-6/NF-κB axis), muscle stem cell activation (Myod1 translation), and also functions in the nucleus to mediate alternative 3' UTR processing and alternative splicing."},"narrative":{"mechanistic_narrative":"CPEB1 is a sequence-specific RNA-binding protein that governs cytoplasmic polyadenylation-induced translation by recognizing cytoplasmic polyadenylation elements (CPEs, UUUUUAU) in the 3' UTRs of target mRNAs and nucleating a regulatory ribonucleoprotein complex on them [PMID:7954828, PMID:8665866]. RNA recognition requires its tandem RRMs together with a cysteine-histidine zinc finger, which fold into a closure-competent arrangement that achieves high-fidelity CPE recognition and positions the protein for complex assembly [PMID:9447964, PMID:24990967]. On bound mRNAs CPEB1 organizes a polyadenylation apparatus that includes the scaffold symplekin, CPSF, and the poly(A) polymerase GLD-2, while in the repressed state it engages eIF4E-binding factors (4E-T, the oocyte-specific eIF4E1b) and recruits the CCR4-NOT deadenylase to keep target mRNAs translationally silent [PMID:11106762, PMID:15550246, PMID:17942399, PMID:36096799]. The molecular switch from repression to activation is a single Aurora A (Eg2/IAK1)-catalyzed phosphorylation of a critical serine that triggers CPSF recruitment and complex remodeling; this event is integrated by additional kinases (MAPK, Cdc2, Plx1) and reversed by PP1, while subsequent SCF(beta-TrCP)-mediated, PEST/TSG-motif-dependent ubiquitination drives partial CPEB1 destruction to impose temporal order on successive polyadenylation events [PMID:11106762, PMID:17986610, PMID:17344432, PMID:12815066, PMID:11927567]. Through this mechanism CPEB1 is essential for oocyte meiotic maturation and germ cell differentiation, controlling polyadenylation of c-mos, cyclin, synaptonemal-complex, and Gdf9 mRNAs, and acts within a CPEB1→CPEB4 translational relay during the meiotic divisions [PMID:8665866, PMID:11702780, PMID:17050619, PMID:20531391]. Beyond meiosis, CPEB1 drives mitotic cell-cycle progression and localizes target mRNAs and translation machinery to the mitotic spindle [PMID:20364142, PMID:33323527], localizes and translates dendritic mRNAs such as alpha-CaMKII at activated synapses [PMID:9856468, PMID:11980711, PMID:12629046], enforces cellular senescence via translational control of p53 and c-myc [PMID:17015432, PMID:19141477], regulates innate immune output through a TAK1/NF-κB/IL-6 axis [PMID:25452303], and maintains epithelial polarity through apical localization of ZO-1 mRNA, the loss of which promotes EMT and metastasis [PMID:22334078, PMID:26411364]. CPEB1 also shuttles into the nucleus via CRM1-dependent export and there directs alternative polyadenylation (3' UTR shortening) and alternative splicing by blocking U2AF65 recruitment [PMID:20040591, PMID:23434754]. Genetically, loss of CPEB1 ameliorates the phenotypes of Fragile X syndrome, where CPEB1 and FMRP act in opposing control of translational elongation [PMID:24141422].","teleology":[{"year":1994,"claim":"Established that a dedicated factor is required for cytoplasmic polyadenylation, answering whether CPE-directed poly(A) addition needs a sequence-specific binding protein.","evidence":"RNA affinity chromatography, immunodepletion/add-back, and in vitro polyadenylation reconstitution in Xenopus egg extracts","pmids":["7954828"],"confidence":"High","gaps":["Did not define the target mRNA repertoire","No structural basis for CPE recognition"]},{"year":1996,"claim":"Defined CPEB1's physiological mRNA targets and showed its activity is required for meiotic maturation, linking polyadenylation to a developmental decision.","evidence":"In vitro polyadenylation, antibody injection into oocytes, immunoprecipitation of cyclin/c-mos mRNAs","pmids":["8665866"],"confidence":"High","gaps":["Did not reveal how CPEB1 activity is switched on","Mechanism coupling polyadenylation to translation unresolved"]},{"year":1998,"claim":"Mapped the RNA-binding determinants, showing both RRMs and a zinc finger are required and that CPEB1 binds as a monomer.","evidence":"Deletion/point mutagenesis with RNA gel-shift and metal chelation/supplementation","pmids":["9447964"],"confidence":"High","gaps":["No atomic structure","Did not address protein-protein contacts"]},{"year":2000,"claim":"Identified the activating switch: Aurora A phosphorylation of a single serine recruits CPSF to build an active polyadenylation complex, the most proximal trigger for polyadenylation.","evidence":"In vitro kinase assay, co-IP, reconstitution with purified components","pmids":["11106762"],"confidence":"High","gaps":["Did not explain temporal ordering of distinct target mRNAs","Upstream control of Aurora A unaddressed"]},{"year":2001,"claim":"Demonstrated CPEB1 is essential in vivo for germ cell differentiation by controlling synaptonemal-complex protein mRNA translation, extending the mechanism to mammalian development.","evidence":"CPEB knockout mouse, polysome fractionation, RNA co-IP, electron microscopy","pmids":["11702780","11526086"],"confidence":"High","gaps":["Full target mRNA set in vivo not defined","Somatic roles untested"]},{"year":2001,"claim":"Showed CPEB1 abundance is actively downregulated via PEST-dependent ubiquitin-proteasome degradation, introducing termination as part of the regulatory cycle.","evidence":"Proteasome/ubiquitin inhibitors, PEST deletion, metabolic labeling","pmids":["11237472"],"confidence":"High","gaps":["E3 ligase not identified","Kinase signals targeting degradation unknown"]},{"year":2003,"claim":"Resolved the timing logic: sequential kinase (MAPK, Cdc2) and phosphatase (PP1) inputs and Cdc2/PEST-dependent partial destruction order successive polyadenylation events during meiosis.","evidence":"Phospho-specific antibodies across staged oocytes, kinase inhibitors, PEST mutagenesis, polyadenylation time-courses","pmids":["12815066","11927567","17344432"],"confidence":"High","gaps":["Integration of multiple phosphosites quantitatively unresolved","PP1 targeting specificity unclear"]},{"year":2002,"claim":"Extended CPEB1-directed polyadenylation to neurons, establishing activity-dependent local translation at synapses downstream of NMDA receptor/Aurora signaling.","evidence":"Synaptic fractionation, immunofluorescence, NMDA stimulation with phosphorylation assay, oocyte injection","pmids":["9856468","11980711","12629046"],"confidence":"High","gaps":["In vivo behavioral consequences not yet defined","Motor-coupling mechanism for transport partially characterized"]},{"year":2004,"claim":"Identified the core complex scaffold (symplekin) and poly(A) polymerase (GLD-2), and placed upstream signaling (insulin/PI3K, GSK-3) on Aurora A activity, building the biochemical architecture of the machine.","evidence":"Co-IP, fractionation, depletion reconstitution in Xenopus extracts; in vitro kinase assays with Aurora A mutants","pmids":["15550246","14724178"],"confidence":"High","gaps":["Stoichiometry and order of assembly not fully resolved","How signals converge spatially unclear"]},{"year":2007,"claim":"Defined the repressive state and termination machinery: CPEB1 partners with eIF4E-binding factors (4E-T, eIF4E1b) to silence mRNAs, ePAB dynamically hands off to eIF4G, and SCF(beta-TrCP) recognizes a phospho-TSG motif for degradation.","evidence":"Reciprocal co-IP, tethered reporter assays, sequential in vitro kinase assays (Cdc2, Plx1), TSG-motif mutagenesis, antibody injection","pmids":["17942399","17938241","17986610"],"confidence":"High","gaps":["Quantitative kinetics of activation-to-repression switching unresolved","Coordination of degradation with translation activation incomplete"]},{"year":2006,"claim":"Showed CPEB1 is required for cellular senescence through translational control of c-myc, connecting it to tumor-suppressor pathways in somatic cells.","evidence":"Knockout MEFs with add-back rescue, epistasis with p53/p19ARF/p16, polysome fractionation","pmids":["17015432"],"confidence":"High","gaps":["Direct vs. indirect control of c-myc translation not fully separated","Relationship to p53 control resolved only later"]},{"year":2009,"claim":"Established translational control of p53 mRNA polyadenylation as a senescence mechanism in human fibroblasts, with metabolic consequences.","evidence":"shRNA knockdown with rescue, poly(A) tail assay, polysome fractionation, respirometry","pmids":["19141477","21478871"],"confidence":"High","gaps":["Opposing directionality of p53 control between studies (miR-122/Gld4 axis) not fully reconciled","Tissue specificity uncharacterized"]},{"year":2010,"claim":"Generalized CPEB1's polyadenylation mechanism to mitotic cell-cycle progression and defined a CPEB1→CPEB4 translational relay, distinguishing paralog roles.","evidence":"RNAi of CPEB1/CPEB4, poly(A) tail assays, cell-cycle FACS, reporter and poly(A) assays during meiosis","pmids":["20364142","20531391"],"confidence":"High","gaps":["Spindle-specific transcript targets not enumerated here","Mechanism of CPEB1-to-CPEB4 handoff partially defined"]},{"year":2012,"claim":"Uncovered a nuclear function: CPEB1 shuttles via CRM1 and directs alternative polyadenylation and splicing genome-wide by blocking U2AF65, broadening its mechanism beyond cytoplasmic translation.","evidence":"CRM1 inhibition, NES mutagenesis, nuclear fractionation, RNA-seq/3' end sequencing, U2AF65 co-IP","pmids":["20040591","18923137","23434754"],"confidence":"High","gaps":["How nuclear vs. cytoplasmic activities are partitioned unclear","Determinants of co-transcriptional recruitment unknown"]},{"year":2012,"claim":"Linked CPEB1 to epithelial polarity through apical ZO-1 mRNA localization, with loss driving EMT and metastasis, establishing a tumor-relevant function.","evidence":"Knockdown/rescue with CPE-mutant ZO-1 mRNA, 3D mammary culture, FISH, in vivo metastasis model, MMP9 poly(A) assay","pmids":["22334078","26411364"],"confidence":"High","gaps":["Mechanism of apical mRNA targeting incompletely defined","Relative contribution of multiple targets to EMT unresolved"]},{"year":2014,"claim":"Determined solution structures of the tandem RRMs and assigned the ZZ domain dual RNA/protein roles, providing the structural basis for high-fidelity CPE recognition and complex nucleation.","evidence":"Solution NMR of free and RNA-bound RRMs with ZZ-domain functional mutagenesis","pmids":["24990967"],"confidence":"High","gaps":["Full-length complex structure absent","Structural basis of phospho-regulation not captured"]},{"year":2014,"claim":"Placed CPEB1 in innate immunity as a translational brake on TAK1, controlling NF-κB/IL-6 output, and in Fragile X via opposing FMRP at translational elongation.","evidence":"Knockout mice, macrophage LPS stimulation, double depletion, TAK1 inhibitor in vivo; Fmr1/Cpeb1 double-knockout phenotypic rescue","pmids":["25452303","28..."],"confidence":"High","gaps":["IL-6 transcriptional vs. translational contributions partially separated","Disease-relevant target hierarchy unclear"]},{"year":2022,"claim":"Distinguished CPEB1 mechanistically from paralogs and identified phosphorylation-driven RNP remodeling and CCR4-NOT recruitment, while extending function to muscle stem cell activation via Myod1 translation.","evidence":"Comparative RNP fractionation, RNA-seq, phosphorylation and phase-separation assays; quantitative proteomics with Myod1 3' UTR CPE binding and genetic mouse models","pmids":["36096799","35177647"],"confidence":"High","gaps":["Whether CPEB1 undergoes phase separation like CPEB2-4 unresolved","In vivo target sets across tissues incomplete"]},{"year":null,"claim":"How CPEB1's nuclear (alternative processing) and cytoplasmic (polyadenylation/translation) activities are coordinated, and what determines target and tissue specificity across its many contexts, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model partitioning nuclear vs. cytoplasmic functions","Full-length RNP complex structure unavailable","Tissue-specific target codes undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,2,33,38]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[5,15,21,17,40]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[5,12,30]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,12,17]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14,5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[24,25,30]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[25]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[4,39]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4,11]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,5,12,30]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[26,10,39]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[6,43,27,46]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[24,30]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[15,21,28]}],"complexes":["CPEB1 cytoplasmic polyadenylation complex (CPEB1-CPSF-symplekin-GLD-2)","CCR4-NOT deadenylase complex (recruited)"],"partners":["CPSF","SYMPLEKIN","GLD-2","MASKIN","EIF4E1B","4E-T","EPAB","AURKA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BZB8","full_name":"Cytoplasmic polyadenylation element-binding protein 1","aliases":[],"length_aa":566,"mass_kda":62.6,"function":"Sequence-specific RNA-binding protein that regulates mRNA cytoplasmic polyadenylation and translation initiation during oocyte maturation, early development and at postsynapse sites of neurons. Binds to the cytoplasmic polyadenylation element (CPE), an uridine-rich sequence element (consensus sequence 5'-UUUUUAU-3') within the mRNA 3'-UTR. RNA binding results in a clear conformational change analogous to the Venus fly trap mechanism (PubMed:24990967). In absence of phosphorylation and in association with TACC3 is also involved as a repressor of translation of CPE-containing mRNA; a repression that is relieved by phosphorylation or degradation (By similarity). Involved in the transport of CPE-containing mRNA to dendrites; those mRNAs may be transported to dendrites in a translationally dormant form and translationally activated at synapses (By similarity). Its interaction with APLP1 promotes local CPE-containing mRNA polyadenylation and translation activation (By similarity). Induces the assembly of stress granules in the absence of stress. Required for cell cycle progression, specifically for prophase entry (PubMed:26398195)","subcellular_location":"Cytoplasm; Nucleus; Cytoplasm, P-body; Cytoplasmic granule; Synapse; Membrane; Postsynaptic density; Cell projection, dendrite","url":"https://www.uniprot.org/uniprotkb/Q9BZB8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CPEB1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CPEB1","total_profiled":1310},"omim":[{"mim_id":"621172","title":"RHO GUANINE NUCLEOTIDE EXCHANGE FACTOR 39; ARHGEF39","url":"https://www.omim.org/entry/621172"},{"mim_id":"614029","title":"SPEEDY/RINGO CELL CYCLE REGULATOR FAMILY, MEMBER A; SPDYA","url":"https://www.omim.org/entry/614029"},{"mim_id":"610607","title":"CYTOPLASMIC POLYADENYLATION ELEMENT-BINDING PROTEIN 4; CPEB4","url":"https://www.omim.org/entry/610607"},{"mim_id":"607342","title":"CYTOPLASMIC POLYADENYLATION ELEMENT-BINDING PROTEIN 1; CPEB1","url":"https://www.omim.org/entry/607342"},{"mim_id":"190060","title":"MOS PROTOONCOGENE, SERINE/THREONINE KINASE; MOS","url":"https://www.omim.org/entry/190060"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":31.6},{"tissue":"testis","ntpm":30.4}],"url":"https://www.proteinatlas.org/search/CPEB1"},"hgnc":{"alias_symbol":["FLJ13203","CPEB"],"prev_symbol":[]},"alphafold":{"accession":"Q9BZB8","domains":[{"cath_id":"3.30.70.330","chopping":"310-349_357-413","consensus_level":"medium","plddt":86.8558,"start":310,"end":413}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BZB8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BZB8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BZB8-F1-predicted_aligned_error_v6.png","plddt_mean":65.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CPEB1","jax_strain_url":"https://www.jax.org/strain/search?query=CPEB1"},"sequence":{"accession":"Q9BZB8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BZB8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BZB8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BZB8"}},"corpus_meta":[{"pmid":"11433366","id":"PMC_11433366","title":"Translational control by CPEB: a means to the end.","date":"2001","source":"Nature reviews. Molecular cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/11433366","citation_count":485,"is_preprint":false},{"pmid":"17481902","id":"PMC_17481902","title":"CPEB: a life in translation.","date":"2007","source":"Trends in biochemical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/17481902","citation_count":442,"is_preprint":false},{"pmid":"14697205","id":"PMC_14697205","title":"A neuronal isoform of the aplysia CPEB has prion-like properties.","date":"2003","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/14697205","citation_count":433,"is_preprint":false},{"pmid":"9856468","id":"PMC_9856468","title":"CPEB-mediated cytoplasmic polyadenylation and the regulation of experience-dependent translation of alpha-CaMKII mRNA at synapses.","date":"1998","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/9856468","citation_count":415,"is_preprint":false},{"pmid":"7954828","id":"PMC_7954828","title":"CPEB is a specificity factor that mediates cytoplasmic polyadenylation during 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Immunodepletion of CPEB from polyadenylation-competent egg extracts abolished cytoplasmic polyadenylation; addition of recombinant CPEB partially restored activity. CPEB contains two RNA recognition motifs (RRMs) and is phosphorylated during oocyte maturation at a time corresponding with induction of polyadenylation.\",\n      \"method\": \"RNA affinity chromatography, immunodepletion, in vitro polyadenylation reconstitution, cDNA cloning\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with immunodepletion and add-back, replicated across multiple subsequent studies\",\n      \"pmids\": [\"7954828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"CPEB binds CPE sequences in the 3' UTRs of cyclin A1, B1, B2, cdk2, c-mos, and G10 mRNAs and is necessary for cytoplasmic polyadenylation of these mRNAs in egg extracts. Injection of CPEB antibody into oocytes inhibits polyadenylation and translational activation of c-mos mRNA and blocks progesterone-induced meiotic maturation.\",\n      \"method\": \"In vitro polyadenylation assay with egg extracts, antibody injection into oocytes, immunoprecipitation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution plus in vivo antibody inhibition, multiple orthogonal methods\",\n      \"pmids\": [\"8665866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Both RRM domains and a cysteine-histidine zinc finger region of CPEB are essential for RNA binding. Deletion of either RRM greatly reduces RNA binding; deletion of the zinc finger abolishes it. Single alanine substitutions of specific cysteines or histidines within the zinc finger also abolish RNA binding. CPEB binds RNA as a monomer; zinc chelation inhibits binding and zinc supplementation restores it.\",\n      \"method\": \"E. coli overexpression of deletion/point mutants, RNA gel-shift assays, metal chelation/supplementation experiments\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis with multiple deletion and point mutations tested by in vitro RNA binding assay\",\n      \"pmids\": [\"9447964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CPEB is present in dendritic layers of hippocampus, at synapses in cultured neurons, and in postsynaptic densities. CPEB binds CPE sequences in the 3' UTR of alpha-CaMKII mRNA, and these CPEs mediate polyadenylation-induced translation in Xenopus oocytes. In the intact brain, visual experience induces alpha-CaMKII mRNA polyadenylation and translation.\",\n      \"method\": \"Immunohistochemistry, postsynaptic density fractionation, RNA injection into Xenopus oocytes, in vivo polyadenylation assay\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — subcellular fractionation, functional oocyte injection assay, and in vivo polyadenylation, replicated by subsequent studies\",\n      \"pmids\": [\"9856468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CPEB and maskin colocalize with cyclin B1 mRNA at the mitotic apparatus (spindle/centrosome) of Xenopus blastomeres. CPEB interacts with microtubules and is required for localization of cyclin B1 mRNA to the mitotic apparatus. Agents disrupting polyadenylation-induced translation inhibit cell division and cause spindle and centrosome defects.\",\n      \"method\": \"Immunofluorescence/colocalization, injection of translation inhibitory agents, RNA localization assays in embryos\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments tied to functional cell division phenotype, multiple orthogonal approaches\",\n      \"pmids\": [\"11081630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Eg2 (Aurora A) kinase phosphorylates CPEB serine 174, and this phosphorylation event is the most proximal stimulus for cytoplasmic polyadenylation. Phosphorylated CPEB directly recruits CPSF (via its 160 kDa subunit) into an active polyadenylation complex. This interaction does not require RNA tethering. Cytoplasmic polyadenylation was reconstituted in vitro with purified components.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, in vitro polyadenylation reconstitution with purified components\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified components plus direct biochemical demonstration of phosphorylation-dependent protein-protein interaction\",\n      \"pmids\": [\"11106762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CPEB knockout female mice have vestigial ovaries devoid of oocytes; oocytes arrest at pachytene in both male and female knockout embryos. Two synaptonemal complex protein mRNAs containing CPEs interact with CPEB in vitro and in vivo, have shortened poly(A) tails, and fail to associate with polysomes in null mice. Synaptonemal complexes are absent in knockout animals, establishing that CPEB controls germ cell differentiation by regulating synaptonemal complex protein mRNA translation.\",\n      \"method\": \"Knockout mouse, polysome fractionation, RNA co-immunoprecipitation, electron microscopy for synaptonemal complex\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined molecular mechanism (polysome association of target mRNAs) and structural phenotype, multiple methods\",\n      \"pmids\": [\"11702780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In mouse oocytes, the murine Aurora A homolog IAK1/Eg2 phosphorylates CPEB on the critical regulatory residue, and this is essential for cytoplasmic polyadenylation and meiotic progression. A dominant-negative non-phosphorylatable CPEB prevents polyadenylation. IAK1/Eg2 inhibitory peptide blocks meiotic progression in injected oocytes.\",\n      \"method\": \"Immunohistochemistry in mouse oocytes, injection of IAK1/Eg2-inhibitory peptide, dominant-negative CPEB injection\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — dominant-negative mutagenesis plus kinase inhibitor in a mammalian model, two orthogonal approaches\",\n      \"pmids\": [\"11526086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CPEB degradation during Xenopus oocyte maturation requires a 14 amino acid PEST domain and occurs via the ubiquitin-proteasome pathway. Approximately 75% of CPEB is degraded coincident with germinal vesicle breakdown; proteasome and ubiquitination inhibitors block this degradation.\",\n      \"method\": \"Proteasome/ubiquitin inhibitor treatment, CPEB PEST domain deletion analysis, metabolic labeling to measure synthesis vs. accumulation\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — pharmacological inhibitors plus domain mapping, multiple methods in single study\",\n      \"pmids\": [\"11237472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NMDA receptor activation at hippocampal synapses triggers Aurora kinase phosphorylation of CPEB, which is required for cytoplasmic polyadenylation and translation of alpha-CaMKII mRNA at synaptic sites. All polyadenylation machinery components (CPEB, maskin, PAP, CPSF, Aurora) are present at synapses.\",\n      \"method\": \"Immunofluorescence/colocalization at synapses, NMDA stimulation with phosphorylation assay, synaptic fractionation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct demonstration of signaling cascade from NMDA receptor to CPEB phosphorylation and polyadenylation at synapses, replicated in subsequent studies\",\n      \"pmids\": [\"11980711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Cdc2-mediated phosphorylation of CPEB via a PEST box triggers partial CPEB destruction by the proteasome during metaphase I in Xenopus oocytes. This partial destruction is required for the temporal activation of cyclin B1 mRNA polyadenylation (at metaphase I, after Mos mRNA) and for meiotic progression to metaphase II. CPEB destruction is also required for mitosis in early embryos.\",\n      \"method\": \"In vivo phosphorylation analysis, proteasome inhibition, CPEB PEST domain mutagenesis, mRNA polyadenylation time-course assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of PEST domain plus kinase inhibition plus in vivo polyadenylation assay, multiple orthogonal methods\",\n      \"pmids\": [\"11927567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CPEB facilitates mRNA transport to dendrites via RNA-containing particles that move in a microtubule-dependent manner (4–8 µm/min). CPEB-GFP particles contain maskin, dynein, and kinesin. The CPE is sufficient for dendritic targeting; a CPEB mutant defective for motor interaction inhibits transport; in CPEB knockout neurons, dendritic transport of a CPE-containing reporter RNA is reduced.\",\n      \"method\": \"Live imaging of CPEB-GFP particles in rat hippocampal neurons, motor protein co-immunoprecipitation, CPEB knockout neurons, recombinant virus-mediated CPE reporter transport assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live imaging with functional mutant and knockout validation, multiple orthogonal methods\",\n      \"pmids\": [\"12629046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Symplekin and xGLD-2 are essential factors for CPEB-mediated cytoplasmic polyadenylation in Xenopus oocytes. Symplekin serves as a scaffold that binds both CPEB and CPSF. xGLD-2, an atypical poly(A) polymerase, is anchored to CPEB and CPSF even before polyadenylation begins.\",\n      \"method\": \"Co-immunoprecipitation, biochemical fractionation, functional depletion assays in Xenopus egg extracts\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IPs plus functional depletion reconstitution in Xenopus extracts, multiple orthogonal methods\",\n      \"pmids\": [\"15550246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Progesterone and insulin both stimulate Aurora A (Eg2)-catalyzed CPEB serine 174 phosphorylation and cytoplasmic polyadenylation; the insulin pathway acts through PI3K/PKC-zeta upstream of Aurora A. The intersection of progesterone and insulin pathways occurs at GSK-3, which inhibits Aurora A by phosphorylating it on S290/291. GSK-3-phosphorylated Aurora A has reduced capacity to phosphorylate CPEB; constitutively active Aurora A (S290/291A) rescues polyadenylation.\",\n      \"method\": \"In vitro kinase assay, GSK-3/Aurora A co-immunoprecipitation, Aurora A mutagenesis (S290/291A, S290/291D), PI3K/PKC inhibitors in oocytes\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assays with site-specific mutants plus signaling pathway epistasis, two orthogonal approaches\",\n      \"pmids\": [\"14724178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"All mammalian CPEB1 isoforms associate with stress granules and dcp1 bodies in the cytoplasm; this association requires the RNA-binding ability of CPEB1, while the Aurora A phosphorylation site is dispensable. Transient CPEB1 overexpression induces assembly of stress granules, which then recruit dcp1 bodies. rck/p54 DEAD-box protein (a known CPEB partner) is present in both structures.\",\n      \"method\": \"Immunofluorescence, CPEB1 RNA-binding mutant analysis, transient transfection/overexpression assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — colocalization with RNA-binding domain requirement demonstrated, single lab with two approaches\",\n      \"pmids\": [\"15731006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CPEB knockout mouse embryo fibroblasts (MEFs) fail to undergo senescence in culture and are immortal; exogenous CPEB restores senescence. CPEB cannot stimulate senescence when p53, p19ARF, or p16INK4A are absent. CPEB acts as a translational repressor of c-myc mRNA; unregulated Myc translation in CPEB-null MEFs may cause bypass of senescence. Ras cannot induce senescence in MEFs lacking CPEB.\",\n      \"method\": \"CPEB knockout MEFs, reintroduction of exogenous CPEB, genetic epistasis with p53/p19ARF/p16 knockout, polysome fractionation for c-myc mRNA\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with add-back rescue, epistasis with tumor suppressors, multiple orthogonal methods\",\n      \"pmids\": [\"17015432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RINGO/Spy mRNA translation is required upstream of CPEB-directed polyadenylation in Xenopus oocytes. Pumilio 2 (Pum2) binds Pumilio-Binding Elements in the RINGO/Spy 3' UTR and represses its translation in immature oocytes; this repression also involves XDAZL and ePAB. After induction of maturation, Pum2 dissociates from RINGO/Spy mRNA, allowing RINGO/Spy synthesis, which is then required for CPEB activation. Pum2 co-immunoprecipitates with XDAZL and ePAB.\",\n      \"method\": \"mRNA reporter assays, deletion analysis of 3' UTR, co-immunoprecipitation, mRNA injection into oocytes\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established by RNA reporter assay, co-IP, and deletion analysis; positions RINGO upstream of CPEB\",\n      \"pmids\": [\"16418484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CPEB in early Xenopus oocytes interacts (protein-protein) with Xp54 RNA helicase, P100/Pat1, RAP55, the eIF4E-binding protein 4E-T, and an oocyte-specific eIF4E isoform (eIF4E1b) — but not with eIF4E1a, eIF4G, or the late-oogenesis factors maskin, PARN, or 4E-BP1. eIF4E1b binds m7GTP weakly and associates with 4E-T (not eIF4G). Tethered 4E-T or eIF4E1b represses translation in a cap-dependent manner. Injection of eIF4E1b antibody accelerates meiotic maturation.\",\n      \"method\": \"Co-immunoprecipitation, gel filtration, pulldown assays, cap-binding assay, tethered reporter translation assay, antibody injection into oocytes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus functional tethered reporter assay plus in vivo antibody injection, multiple methods\",\n      \"pmids\": [\"17942399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ePAB (embryonic poly(A)-binding protein) transiently associates with the CPEB polyadenylation complex; it initially interacts with CPEB, then shifts to bind the poly(A) tail after polyadenylation. Dissociation of ePAB from CPEB is regulated by RINGO/cdk1, which phosphorylates CPEB. Poly(A)-bound ePAB interacts with eIF4G to initiate translation of CPEB-bound mRNAs.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, poly(A) tail protection assays, translation initiation complex analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP showing dynamic complex remodeling tied to kinase activity and translation initiation, two orthogonal methods\",\n      \"pmids\": [\"17938241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CPEB degradation during Xenopus oocyte maturation is mediated by the SCF(beta-TrCP) E3 ubiquitin ligase. beta-TrCP binds a TSG motif (residues 190–195) of CPEB. This binding requires phosphorylation of Thr-190, Ser-191, and Ser-195; Ser-191 is phosphorylated by Polo-like kinase Plx1, which itself binds CPEB at Thr-125 pre-phosphorylated by Cdc2. Cdc2-mediated phosphorylation of multiple Ser residues is required for Thr-125 phosphorylation and beta-TrCP binding.\",\n      \"method\": \"In vitro kinase assays (Cdc2, Plx1), co-immunoprecipitation, site-directed mutagenesis of TSG motif, ubiquitin-proteasome pathway assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical reconstitution of sequential kinase steps with mutagenesis, multiple orthogonal methods\",\n      \"pmids\": [\"17986610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MAPK is required for early CPEB phosphorylation in Xenopus oocytes during meiotic resumption. MAPK directly phosphorylates CPEB on four residues (T22, T164, S184, S248) but not on S174 (the Aurora A site). XGef (a Rho-GEF) co-immunoprecipitates with MAPK, and this complex can phosphorylate CPEB.\",\n      \"method\": \"Kinase inhibitors (U0126 for MAPK; ZM447439 for Aurora A/B), in vitro MAPK phosphorylation of CPEB, co-immunoprecipitation of XGef-MAPK complex\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay identifying phosphorylation sites plus pharmacological epistasis, two orthogonal methods\",\n      \"pmids\": [\"17344432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CPEB-regulated translation is essential for cellular senescence of human diploid fibroblasts. CPEB knockdown allows cells to bypass senescence (M1 crisis). Knockdown cells have fewer mitochondria, reduced respiration and ROS, normal ATP, and enhanced glycolysis (Warburg-like phenotype). CPEB promotes polyadenylation of p53 mRNA 3' UTR CPEs; CPEB-depleted cells have shortened p53 poly(A) tails and ~50% reduced p53 protein, and a ~50% shRNA-mediated reduction in p53 also extends cellular lifespan.\",\n      \"method\": \"CPEB shRNA knockdown in human fibroblasts, add-back rescue, poly(A) tail length assay, polysome fractionation, mitochondria counting, respirometry\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockdown with add-back rescue plus molecular mechanism (p53 mRNA polyadenylation), multiple orthogonal methods\",\n      \"pmids\": [\"19141477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CPEB-1 controls translation of c-Jun mRNA through CPEs in its 3' UTR; reduced c-Jun leads to lower GH transcription and reduced GH signaling (phospho-JAK2/phospho-STAT3) in CPEB-1 knockout hippocampus. CPEB-1 co-immunoprecipitates c-Jun RNA in vivo and binds c-Jun 3' UTR CPEs in vitro. Growth hormone restores LTP in hippocampal slices from WT but not KO mice with reduced magnitude.\",\n      \"method\": \"CPEB-1 knockout mice, proteomics comparison, co-immunoprecipitation of RNA, in vitro CPE binding assay, electrophysiology (LTP), pharmacological polyadenylation inhibition\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout combined with in vivo RNA co-IP and in vitro binding, multiple orthogonal methods\",\n      \"pmids\": [\"18716208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CPEB RNA-binding protein regulates beta-catenin mRNA translation in astrocytes via a CPE in the beta-catenin 3' UTR. A dominant-negative CPEB blocks beta-catenin localization to the leading edge of migrating astrocytes and inhibits directed cell migration.\",\n      \"method\": \"In vitro wound-healing assay, dominant-negative CPEB expression, identification of CPE in beta-catenin 3' UTR, immunofluorescence\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — dominant-negative phenotype plus 3' UTR CPE identification, single lab, two methods\",\n      \"pmids\": [\"18618654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CPEB1 shuttles between nucleus and cytoplasm via the CRM1-dependent export pathway and in the nucleus associates with lampbrush chromosomes in Xenopus oocytes and with proteins involved in nuclear RNA processing. CPEB interacts with Maskin in the nucleus and with CPE-containing mRNAs. CPEB also directly or indirectly mediates alternative splicing of at least one pre-mRNA.\",\n      \"method\": \"Leptomycin B-mediated CRM1 inhibition, nuclear fractionation, immunofluorescence on lampbrush chromosomes, RNA immunoprecipitation, alternative splicing assays\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRM1-dependent export demonstrated pharmacologically, nuclear localization and RNA association shown by multiple methods\",\n      \"pmids\": [\"20040591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CPEB1 accumulates in Crm1 nucleolar bodies (CNoBs) in the nucleus; export depends on two redundant NES motifs recognized by Crm1. CNoBs depend on RNA polymerase I activity. CPEB1 continuously shuttles between nucleus and cytoplasm.\",\n      \"method\": \"Crm1 inhibition (leptomycin B), NES mutagenesis, Pol I inhibition, live imaging, immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — NES mutagenesis plus pharmacological inhibition identifies export mechanism and nuclear localization, single lab\",\n      \"pmids\": [\"18923137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CPEB1 and CPEB4 are required for mitotic cell-cycle progression; loss of both causes defective entry into M phase in mitotically dividing somatic cells. Phase-specific changes in poly(A) tail length of target mRNAs mediated by CPEB1 and CPEB4 are required for cell proliferation, extending the cytoplasmic polyadenylation mechanism to general mitotic regulation.\",\n      \"method\": \"RNAi knockdown of CPEB1/CPEB4, poly(A) tail length assays, cell cycle analysis by FACS in mitotically dividing cells\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockdown with cell cycle phenotype and poly(A) tail measurement, two orthogonal methods\",\n      \"pmids\": [\"20364142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CPEB1 activates translation of CPEB4 mRNA, generating a positive translational loop during meiosis. CPEB1 is degraded during the first meiotic division; CPEB4 then replaces CPEB1 and drives the metaphase I to metaphase II transition. CPEB1 and CPEB4 are differentially regulated by phase-specific kinases.\",\n      \"method\": \"In vivo poly(A) tail length assays, reporter translation assays, in vivo CPEB1/CPEB4 expression analysis during meiotic progression\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — poly(A) tail measurement plus reporter assays establish CPEB1→CPEB4 translational cascade, two methods\",\n      \"pmids\": [\"20531391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CPEB controls IL-6 production at both translational and transcriptional levels in MEFs; CPEB-deficient cells produce large amounts of IL-6 due to improper NF-κB p65 phosphorylation and nuclear retention. IL-6-promoted senescence requires p53; CPEB knockout MEFs produce only ~50% of p53 protein and cannot respond to IL-6 for senescence.\",\n      \"method\": \"CPEB knockout MEFs, NF-κB nuclear localization assay, IL-6 ELISA, p65 phosphorylation analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — knockout phenotype with NF-κB localization analysis, single lab, limited reconstitution\",\n      \"pmids\": [\"21536657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CPEB depletion surprisingly promotes p53 mRNA polyadenylation/translation and premature senescence in fibroblasts through a miR-122/CPEB/Gld4 axis. Gld2 depletion destabilizes miR-122 (which has two binding sites in the CPEB 3' UTR), thereby elevating CPEB mRNA translation. A second poly(A) polymerase, Gld4, mediates p53 mRNA polyadenylation/translation in a CPEB-dependent manner.\",\n      \"method\": \"siRNA depletion, poly(A) tail length assay, antagomir of miR-122, 3' UTR reporter assays, cellular senescence assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple siRNA depletions with poly(A) assay and reporter validation, two orthogonal mechanistic approaches\",\n      \"pmids\": [\"21478871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CPEB1 shuttles to the nucleus where it co-localizes with splicing factors and mediates shortening of hundreds of mRNA 3' UTRs (alternative polyadenylation). CPEB1 binding to pre-mRNAs directs use of alternative polyadenylation sites and alters alternative splicing by preventing U2AF65 recruitment. CPEB1-mediated 3' UTR shortening correlates with cell proliferation and tumorigenesis.\",\n      \"method\": \"Nuclear-cytoplasmic fractionation, immunofluorescence with splicing factor markers, RNA-seq, 3' end sequencing, U2AF65 co-immunoprecipitation, reporter assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide 3' end sequencing plus mechanistic follow-up with U2AF65 co-IP and reporter assays, multiple orthogonal methods\",\n      \"pmids\": [\"23434754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CPEB mediates apical localization of ZO-1 mRNA in mammary epithelial cells through CPE binding sites in the ZO-1 3' UTR. CPEB depletion disrupts ZO-1 apical localization, tight-junction distribution, and lumen formation in 3D culture. Rescue with ZO-1 mRNA containing CPEB-binding sites (but not without) restores cavity formation.\",\n      \"method\": \"RNAi knockdown, ectopic CPEB expression, 3D mammary culture, immunofluorescence, RNA localization by FISH, rescue with wild-type vs. CPE-mutant ZO-1 mRNA\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockdown/rescue with CPE-binding site mutagenesis establishing causal mechanism, multiple methods\",\n      \"pmids\": [\"22334078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FMRP and CPEB1 maintain translational homeostasis at the level of polypeptide elongation. Fmr1(-/y); Cpeb1(-/-) double-knockout mice show amelioration of biochemical, morphological, electrophysiological, and behavioral phenotypes of Fragile X syndrome. Acute hippocampal depletion of CPEB1 in adult Fmr1(-/y) mice rescues working memory deficits.\",\n      \"method\": \"Double knockout mice, behavioral testing, electrophysiology, western blot, acute CPEB1 knockdown in adult mice\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in double-knockout plus acute adult rescue, multiple phenotypic readouts\",\n      \"pmids\": [\"24141422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Solution structures of the tandem RRMs of human CPEB1 (and CPEB4) in free and RNA-bound states reveal an unprecedented RRM arrangement in the free state that undergoes a closure motion upon RNA binding for high-fidelity CPE recognition. The ZZ (zinc-binding) domain of CPEB1 contributes to both protein-protein and protein-RNA interactions, enabling optimal positioning of N-terminal and ZZ domains for ribonucleoprotein complex nucleation at 3' UTRs.\",\n      \"method\": \"Solution NMR structure determination of free and RNA-bound RRMs, functional mutagenesis of ZZ domain, binding assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — solution NMR structures in free and RNA-bound states with functional validation by mutagenesis, structurally rigorous\",\n      \"pmids\": [\"24990967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CPEB regulates translation of TAK1 mRNA in macrophages; CPEB-depleted macrophages have elevated TAK1 protein, leading to prolonged NF-κB nuclear retention and high IL-6 production upon LPS stimulation. CPEB/TAK1 double depletion rescues elevated IL-6. CPEB knockout mice show LPS hypersensitivity with excess IL-6 and cytokines, which is mitigated by the TAK1 inhibitor oxozeaenol.\",\n      \"method\": \"CPEB KO mice, macrophage LPS stimulation, CPEB/TAK1 double depletion, NF-κB nuclear localization, IL-6 ELISA, TAK1 inhibitor in vivo\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double depletion, pharmacological rescue in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"25452303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CPEB1 depletion in mammary epithelial cells causes EMT and metastasis to the lung. CPEB1-depleted cells have MMP9 mRNA with a longer poly(A) tail and enhanced MMP9 translation. Ectopic CPEB1 prevents metastasis. CPEB1 mediates apical ZO-1 mRNA localization required for cell polarity, and loss of this polarity drives EMT.\",\n      \"method\": \"CPEB1 RNAi in mammary cells, mouse fat pad injection for in vivo metastasis, poly(A) tail assay for MMP9 mRNA, polysome fractionation, ectopic CPEB1 rescue\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo metastasis model plus poly(A) tail mechanism, multiple methods, single lab\",\n      \"pmids\": [\"26411364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CPEB1 activation promotes alternative nuclear processing of VEGF and CPEB4 mRNAs (deleting translation repressor elements in their 3' UTRs). Subsequently, CPEB4 promotes cytoplasmic polyadenylation of VEGF mRNA, increasing its translation. CPEB1 or CPEB4 knockdown in mice prevents VEGF overexpression and pathologic mesenteric angiogenesis after portal vein ligation.\",\n      \"method\": \"siRNA knockdown, luciferase reporter assay, poly(A) tail assay, 3' RACE, Matrigel tube formation assay, CPEB-deficient mice with portal vein ligation\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reporter assays plus poly(A) tail analysis plus in vivo knockout mouse model, multiple orthogonal approaches\",\n      \"pmids\": [\"26627607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Human CPEB1, when ectopically expressed in non-infected cells, recapitulates infection-related post-transcriptional changes (alternative splicing, 3' UTR shortening, poly(A) tail lengthening) caused by HCMV infection. CPEB1 is required for poly(A) tail lengthening of viral RNAs important for productive infection; CPEB1 depletion decreases productive HCMV titers and reverses infection-related cytopathology.\",\n      \"method\": \"CPEB1 ectopic expression, CPEB1 siRNA depletion, transcriptome-wide RNA-seq, poly(A) tail length assay, viral titer measurement\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ectopic expression recapitulates phenotype, knockdown reversal, transcriptome-wide analysis, multiple orthogonal methods\",\n      \"pmids\": [\"27775709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CPEB1 directly binds the 3' UTR of SIRT1 mRNA (via CPE sites), controls its poly(A) tail length, and suppresses SIRT1 translation, thereby reducing hepatocellular carcinoma (HCC) cancer stemness. Site-directed mutagenesis of CPE sites in SIRT1 3' UTR confirmed direct CPEB1 targeting. CPEB1 overexpression reduced self-renewal and stemness markers in HCC in vitro and in vivo.\",\n      \"method\": \"Site-directed mutagenesis, luciferase reporter assay with SIRT1 3' UTR, RNA immunoprecipitation, poly(A) tail assay, orthotopic mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of CPE sites plus reporter assay plus RNA-IP, rigorous mechanistic dissection\",\n      \"pmids\": [\"30237545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Mitotic spindles contain CPE-localized mRNAs and translating ribosomes. CPEB1 and CPEB4 both localize to mitotic spindles and function sequentially: CPEB1 controls metaphase and CPEB4 controls anaphase/cytokinesis by binding specific spindle-associated transcripts and controlling expression and/or localization of their encoded factors.\",\n      \"method\": \"RNA-FISH of spindle-associated mRNAs, immunofluorescence of CPEB1/CPEB4 at spindles, ribosome localization at spindles, RNAi knockdown with cell cycle staging\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional knockdown data, single lab\",\n      \"pmids\": [\"33323527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CPEB1 regulates the translational landscape during muscle satellite cell (SC) quiescence-to-activation transition. Phosphorylation-dependent CPEB1 promotes MyoD1 (Myod1) protein synthesis by binding CPEs in the Myod1 3' UTR, driving SC activation and muscle regeneration.\",\n      \"method\": \"In vivo mouse perfusion fixation to isolate bona fide quiescent SCs, quantitative proteomics + transcriptomics, CPEB1 binding to Myod1 3' UTR CPEs, phosphorylation analysis, genetic mouse models of SC activation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proteomics plus 3' UTR CPE binding with phosphorylation-dependent mechanism and in vivo genetic model, multiple orthogonal methods\",\n      \"pmids\": [\"35177647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CPEB1 (but not CPEB2-4) forms ribonucleoprotein complexes that are remodeled upon a single phosphorylation event, and these complexes are associated with mRNAs containing canonical CPEs. All four CPEBs can recruit the CCR4-NOT deadenylation complex to repress translation. CPEB2-4 are regulated by multiple proline-directed phosphorylations that control liquid-liquid phase separation, distinguishing them mechanistically from CPEB1.\",\n      \"method\": \"Biochemical fractionation of RNP complexes, RNA-binding assays, phosphorylation analysis, phase separation assays, RNA-seq of target mRNAs\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — comprehensive comparative biochemical analysis of all four CPEBs with multiple orthogonal methods establishing differential mechanisms\",\n      \"pmids\": [\"36096799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CPEB phosphorylation occurs at Thr-171 in mouse oocytes at embryonic day E16.5 (pachytene) and is dephosphorylated at E18.5 (diplotene) by the phosphatase PP1; phosphorylation is mediated by Aurora kinase. This temporal regulation of CPEB phosphorylation provides a mechanism for controlled activation of CPE-containing mRNA translation during meiosis.\",\n      \"method\": \"Phospho-specific antibody analysis of mouse oocytes at defined developmental stages, PP1 inhibitor and Aurora kinase inhibitor assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — phosphorylation analysis in vivo with phosphatase identification by inhibitor, single lab\",\n      \"pmids\": [\"12815066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CPEB controls oocyte growth and follicle development in the mouse. Oocyte-specific CPEB knockdown causes parthenogenetic cell division, abnormal polar bodies, spindle anomalies, follicular apoptosis, and infertility. CPEB binds multiple oocyte mRNAs including Gdf9; in CPEB knockdown oocytes, Gdf9 mRNA has a shortened poly(A) tail and reduced expression.\",\n      \"method\": \"Zp3-promoter driven siRNA transgenic knockdown, poly(A) tail assay for Gdf9, immunofluorescence of spindles, CPEB RNA co-immunoprecipitation\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — oocyte-specific knockdown with poly(A) tail mechanism for target mRNA, multiple phenotypic and molecular assays\",\n      \"pmids\": [\"17050619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Translational regulation of beta-catenin mRNA by CPEB1 is required for localization of beta-catenin to the leading edge of migrating astrocytes and for directed cell migration in an in vitro wound-healing assay. Reporter mRNA containing CPEB1-binding sites is transported to the leading edge of migrating glioblastoma cells; point mutations in the binding sites abolish leading-edge localization.\",\n      \"method\": \"In vitro wound-healing assay, dominant-negative CPEB1, CPE reporter mRNA localization with point mutations, immunofluorescence\",\n      \"journal\": \"Molecular cancer research: MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — dominant-negative and CPE-mutant reporter showing mechanistic link between CPEB1 binding and mRNA localization/cell migration, single lab\",\n      \"pmids\": [\"23360795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PKCε co-immunoprecipitates with CPEB in IB4-positive nociceptors, and CPEB is downstream of PKCε in the signaling cascade responsible for hyperalgesic priming. Antisense knockdown of CPEB prevents but does not reverse psiεRACK (PKCε agonist)-induced priming, establishing CPEB as required for priming induction.\",\n      \"method\": \"Co-immunoprecipitation of PKCε and CPEB, intrathecal antisense oligodeoxynucleotides, behavioral hyperalgesia assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single co-IP plus functional antisense knockdown establishing pathway position, single lab\",\n      \"pmids\": [\"22323716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DAZL and CPEB1 synergistically regulate maternal mRNA translation during oocyte meiotic re-entry. Depletion of either DAZL or CPEB1 impairs ribosome loading onto target mRNAs (e.g., Tex19.1). Mutagenesis of DAZL-binding sites and CPEs in target 3' UTRs demonstrates that both proteins cooperate directly on the same mRNA. Genome-wide analysis confirms synergism between DAZL-binding sites and CPEs.\",\n      \"method\": \"Ribosome loading assay (polysome fractionation), oocyte depletion of DAZL and CPEB1, 3' UTR mutagenesis, genome-wide polysome analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide polysome analysis plus mutagenesis plus individual depletion, multiple orthogonal methods\",\n      \"pmids\": [\"26826184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PATL2, an oocyte-specific RNA-binding protein, physically interacts with both EIF4E and CPEB1 to regulate maternal mRNA expression in immature oocytes. Patl2-/- germinal vesicle oocytes show reduced maternal mRNA expression and decreased protein synthesis. PATL2 phosphorylation at S279 is identified during oocyte maturation and S279D mutation decreases PATL2 protein levels via ubiquitin-mediated proteasomal degradation.\",\n      \"method\": \"Co-immunoprecipitation of PATL2-EIF4E-CPEB1, Patl2 knockout oocytes, phosphoproteomics, knock-in mouse model, ubiquitin-proteasome pathway analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP identifying CPEB1 complex partner plus knockout phenotype, single lab\",\n      \"pmids\": [\"37218508\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CPEB1 is a sequence-specific RNA-binding protein that binds CPE (UUUUUAU) sequences in the 3' UTRs of target mRNAs via tandem RRMs and a zinc finger (ZZ) domain, nucleating a large ribonucleoprotein complex (including CPSF, symplekin, GLD-2 poly(A) polymerase, PARN deadenylase, maskin/eIF4E-binding proteins, and ePAB) to control cytoplasmic polyadenylation-induced translational activation; CPEB1 activity is switched on by Aurora A (Eg2/IAK1)-catalyzed phosphorylation of Ser-174 (which recruits CPSF), is temporally regulated by additional kinases (Cdc2, MAPK, Plx1) and phosphatases (PP1), and is terminated by SCF(beta-TrCP)-mediated proteasomal degradation; beyond meiosis, CPEB1 operates in somatic cells to regulate cell-cycle progression (mitosis), cellular senescence (via p53 and Myc mRNA translation), epithelial polarity (ZO-1 mRNA apical localization), immune responses (TAK1/IL-6/NF-κB axis), muscle stem cell activation (Myod1 translation), and also functions in the nucleus to mediate alternative 3' UTR processing and alternative splicing.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CPEB1 is a sequence-specific RNA-binding protein that governs cytoplasmic polyadenylation-induced translation by recognizing cytoplasmic polyadenylation elements (CPEs, UUUUUAU) in the 3' UTRs of target mRNAs and nucleating a regulatory ribonucleoprotein complex on them [#0, #1]. RNA recognition requires its tandem RRMs together with a cysteine-histidine zinc finger, which fold into a closure-competent arrangement that achieves high-fidelity CPE recognition and positions the protein for complex assembly [#2, #33]. On bound mRNAs CPEB1 organizes a polyadenylation apparatus that includes the scaffold symplekin, CPSF, and the poly(A) polymerase GLD-2, while in the repressed state it engages eIF4E-binding factors (4E-T, the oocyte-specific eIF4E1b) and recruits the CCR4-NOT deadenylase to keep target mRNAs translationally silent [#5, #12, #17, #41]. The molecular switch from repression to activation is a single Aurora A (Eg2/IAK1)-catalyzed phosphorylation of a critical serine that triggers CPSF recruitment and complex remodeling; this event is integrated by additional kinases (MAPK, Cdc2, Plx1) and reversed by PP1, while subsequent SCF(beta-TrCP)-mediated, PEST/TSG-motif-dependent ubiquitination drives partial CPEB1 destruction to impose temporal order on successive polyadenylation events [#5, #19, #20, #42, #10]. Through this mechanism CPEB1 is essential for oocyte meiotic maturation and germ cell differentiation, controlling polyadenylation of c-mos, cyclin, synaptonemal-complex, and Gdf9 mRNAs, and acts within a CPEB1\\u2192CPEB4 translational relay during the meiotic divisions [#1, #6, #43, #27]. Beyond meiosis, CPEB1 drives mitotic cell-cycle progression and localizes target mRNAs and translation machinery to the mitotic spindle [#26, #39], localizes and translates dendritic mRNAs such as alpha-CaMKII at activated synapses [#3, #9, #11], enforces cellular senescence via translational control of p53 and c-myc [#15, #21], regulates innate immune output through a TAK1/NF-\\u03baB/IL-6 axis [#34], and maintains epithelial polarity through apical localization of ZO-1 mRNA, the loss of which promotes EMT and metastasis [#31, #35]. CPEB1 also shuttles into the nucleus via CRM1-dependent export and there directs alternative polyadenylation (3' UTR shortening) and alternative splicing by blocking U2AF65 recruitment [#24, #30]. Genetically, loss of CPEB1 ameliorates the phenotypes of Fragile X syndrome, where CPEB1 and FMRP act in opposing control of translational elongation [#32].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established that a dedicated factor is required for cytoplasmic polyadenylation, answering whether CPE-directed poly(A) addition needs a sequence-specific binding protein.\",\n      \"evidence\": \"RNA affinity chromatography, immunodepletion/add-back, and in vitro polyadenylation reconstitution in Xenopus egg extracts\",\n      \"pmids\": [\"7954828\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the target mRNA repertoire\", \"No structural basis for CPE recognition\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined CPEB1's physiological mRNA targets and showed its activity is required for meiotic maturation, linking polyadenylation to a developmental decision.\",\n      \"evidence\": \"In vitro polyadenylation, antibody injection into oocytes, immunoprecipitation of cyclin/c-mos mRNAs\",\n      \"pmids\": [\"8665866\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not reveal how CPEB1 activity is switched on\", \"Mechanism coupling polyadenylation to translation unresolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Mapped the RNA-binding determinants, showing both RRMs and a zinc finger are required and that CPEB1 binds as a monomer.\",\n      \"evidence\": \"Deletion/point mutagenesis with RNA gel-shift and metal chelation/supplementation\",\n      \"pmids\": [\"9447964\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic structure\", \"Did not address protein-protein contacts\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified the activating switch: Aurora A phosphorylation of a single serine recruits CPSF to build an active polyadenylation complex, the most proximal trigger for polyadenylation.\",\n      \"evidence\": \"In vitro kinase assay, co-IP, reconstitution with purified components\",\n      \"pmids\": [\"11106762\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain temporal ordering of distinct target mRNAs\", \"Upstream control of Aurora A unaddressed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrated CPEB1 is essential in vivo for germ cell differentiation by controlling synaptonemal-complex protein mRNA translation, extending the mechanism to mammalian development.\",\n      \"evidence\": \"CPEB knockout mouse, polysome fractionation, RNA co-IP, electron microscopy\",\n      \"pmids\": [\"11702780\", \"11526086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full target mRNA set in vivo not defined\", \"Somatic roles untested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed CPEB1 abundance is actively downregulated via PEST-dependent ubiquitin-proteasome degradation, introducing termination as part of the regulatory cycle.\",\n      \"evidence\": \"Proteasome/ubiquitin inhibitors, PEST deletion, metabolic labeling\",\n      \"pmids\": [\"11237472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase not identified\", \"Kinase signals targeting degradation unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Resolved the timing logic: sequential kinase (MAPK, Cdc2) and phosphatase (PP1) inputs and Cdc2/PEST-dependent partial destruction order successive polyadenylation events during meiosis.\",\n      \"evidence\": \"Phospho-specific antibodies across staged oocytes, kinase inhibitors, PEST mutagenesis, polyadenylation time-courses\",\n      \"pmids\": [\"12815066\", \"11927567\", \"17344432\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of multiple phosphosites quantitatively unresolved\", \"PP1 targeting specificity unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extended CPEB1-directed polyadenylation to neurons, establishing activity-dependent local translation at synapses downstream of NMDA receptor/Aurora signaling.\",\n      \"evidence\": \"Synaptic fractionation, immunofluorescence, NMDA stimulation with phosphorylation assay, oocyte injection\",\n      \"pmids\": [\"9856468\", \"11980711\", \"12629046\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo behavioral consequences not yet defined\", \"Motor-coupling mechanism for transport partially characterized\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified the core complex scaffold (symplekin) and poly(A) polymerase (GLD-2), and placed upstream signaling (insulin/PI3K, GSK-3) on Aurora A activity, building the biochemical architecture of the machine.\",\n      \"evidence\": \"Co-IP, fractionation, depletion reconstitution in Xenopus extracts; in vitro kinase assays with Aurora A mutants\",\n      \"pmids\": [\"15550246\", \"14724178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and order of assembly not fully resolved\", \"How signals converge spatially unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the repressive state and termination machinery: CPEB1 partners with eIF4E-binding factors (4E-T, eIF4E1b) to silence mRNAs, ePAB dynamically hands off to eIF4G, and SCF(beta-TrCP) recognizes a phospho-TSG motif for degradation.\",\n      \"evidence\": \"Reciprocal co-IP, tethered reporter assays, sequential in vitro kinase assays (Cdc2, Plx1), TSG-motif mutagenesis, antibody injection\",\n      \"pmids\": [\"17942399\", \"17938241\", \"17986610\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative kinetics of activation-to-repression switching unresolved\", \"Coordination of degradation with translation activation incomplete\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed CPEB1 is required for cellular senescence through translational control of c-myc, connecting it to tumor-suppressor pathways in somatic cells.\",\n      \"evidence\": \"Knockout MEFs with add-back rescue, epistasis with p53/p19ARF/p16, polysome fractionation\",\n      \"pmids\": [\"17015432\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs. indirect control of c-myc translation not fully separated\", \"Relationship to p53 control resolved only later\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established translational control of p53 mRNA polyadenylation as a senescence mechanism in human fibroblasts, with metabolic consequences.\",\n      \"evidence\": \"shRNA knockdown with rescue, poly(A) tail assay, polysome fractionation, respirometry\",\n      \"pmids\": [\"19141477\", \"21478871\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Opposing directionality of p53 control between studies (miR-122/Gld4 axis) not fully reconciled\", \"Tissue specificity uncharacterized\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Generalized CPEB1's polyadenylation mechanism to mitotic cell-cycle progression and defined a CPEB1\\u2192CPEB4 translational relay, distinguishing paralog roles.\",\n      \"evidence\": \"RNAi of CPEB1/CPEB4, poly(A) tail assays, cell-cycle FACS, reporter and poly(A) assays during meiosis\",\n      \"pmids\": [\"20364142\", \"20531391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spindle-specific transcript targets not enumerated here\", \"Mechanism of CPEB1-to-CPEB4 handoff partially defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Uncovered a nuclear function: CPEB1 shuttles via CRM1 and directs alternative polyadenylation and splicing genome-wide by blocking U2AF65, broadening its mechanism beyond cytoplasmic translation.\",\n      \"evidence\": \"CRM1 inhibition, NES mutagenesis, nuclear fractionation, RNA-seq/3' end sequencing, U2AF65 co-IP\",\n      \"pmids\": [\"20040591\", \"18923137\", \"23434754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How nuclear vs. cytoplasmic activities are partitioned unclear\", \"Determinants of co-transcriptional recruitment unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked CPEB1 to epithelial polarity through apical ZO-1 mRNA localization, with loss driving EMT and metastasis, establishing a tumor-relevant function.\",\n      \"evidence\": \"Knockdown/rescue with CPE-mutant ZO-1 mRNA, 3D mammary culture, FISH, in vivo metastasis model, MMP9 poly(A) assay\",\n      \"pmids\": [\"22334078\", \"26411364\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of apical mRNA targeting incompletely defined\", \"Relative contribution of multiple targets to EMT unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Determined solution structures of the tandem RRMs and assigned the ZZ domain dual RNA/protein roles, providing the structural basis for high-fidelity CPE recognition and complex nucleation.\",\n      \"evidence\": \"Solution NMR of free and RNA-bound RRMs with ZZ-domain functional mutagenesis\",\n      \"pmids\": [\"24990967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length complex structure absent\", \"Structural basis of phospho-regulation not captured\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed CPEB1 in innate immunity as a translational brake on TAK1, controlling NF-\\u03baB/IL-6 output, and in Fragile X via opposing FMRP at translational elongation.\",\n      \"evidence\": \"Knockout mice, macrophage LPS stimulation, double depletion, TAK1 inhibitor in vivo; Fmr1/Cpeb1 double-knockout phenotypic rescue\",\n      \"pmids\": [\"25452303\", \"28...\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"IL-6 transcriptional vs. translational contributions partially separated\", \"Disease-relevant target hierarchy unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Distinguished CPEB1 mechanistically from paralogs and identified phosphorylation-driven RNP remodeling and CCR4-NOT recruitment, while extending function to muscle stem cell activation via Myod1 translation.\",\n      \"evidence\": \"Comparative RNP fractionation, RNA-seq, phosphorylation and phase-separation assays; quantitative proteomics with Myod1 3' UTR CPE binding and genetic mouse models\",\n      \"pmids\": [\"36096799\", \"35177647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CPEB1 undergoes phase separation like CPEB2-4 unresolved\", \"In vivo target sets across tissues incomplete\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CPEB1's nuclear (alternative processing) and cytoplasmic (polyadenylation/translation) activities are coordinated, and what determines target and tissue specificity across its many contexts, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model partitioning nuclear vs. cytoplasmic functions\", \"Full-length RNP complex structure unavailable\", \"Tissue-specific target codes undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 2, 33, 38]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [5, 15, 21, 17, 40]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [5, 12, 30]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 12, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [24, 25, 30]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [25]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [4, 39]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 5, 12, 30]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [26, 10, 39]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [6, 43, 27, 46]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [24, 30]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [15, 21, 28]}\n    ],\n    \"complexes\": [\n      \"CPEB1 cytoplasmic polyadenylation complex (CPEB1-CPSF-symplekin-GLD-2)\",\n      \"CCR4-NOT deadenylase complex (recruited)\"\n    ],\n    \"partners\": [\n      \"CPSF\",\n      \"symplekin\",\n      \"GLD-2\",\n      \"maskin\",\n      \"eIF4E1b\",\n      \"4E-T\",\n      \"ePAB\",\n      \"AURKA\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}