{"gene":"CPEB4","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2006,"finding":"CPEB3 and CPEB4 interact with different RNA sequences than CPEB1, as determined by SELEX, RNA structure probing, and RNA footprinting, establishing them as distinct classes of RNA-binding proteins with different binding specificities.","method":"SELEX, RNA structure probing, RNA footprinting","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biochemical methods (SELEX, structure probing, footprinting) in a single rigorous study","pmids":["17024188"],"is_preprint":false},{"year":2010,"finding":"CPEB4 mediates cytoplasmic polyadenylation-dependent translational control specifically required for M-phase entry in mitotically dividing cells. CPEB1 and CPEB4 act sequentially: CPEB1 regulates G2/M mRNAs and CPEB4 regulates M-phase mRNAs through phase-specific poly(A) tail length changes.","method":"Loss-of-function (siRNA/KO), poly(A) tail length assays, cell cycle analysis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — defined cellular phenotype (M-phase entry failure), poly(A) tail assays, replicated across mitotic cell lines and supported by epistasis with CPEB1","pmids":["20364142"],"is_preprint":false},{"year":2010,"finding":"CPEB1 activates translation of CPEB4 mRNA during meiosis by cytoplasmic polyadenylation, generating a positive feedback loop. CPEB4 then replaces CPEB1 after its degradation at meiosis I and drives the metaphase I to metaphase II transition. CPEB1 and CPEB4 are differentially regulated by phase-specific kinases.","method":"Xenopus oocyte meiotic progression assays, poly(A) tail assays, kinase inhibitor experiments, translation reporter assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods in Xenopus meiosis, epistasis established, replicated by independent group (PMID:20364142)","pmids":["20531391"],"is_preprint":false},{"year":2010,"finding":"CPEB4 is a nucleus-cytoplasm shuttling protein that accumulates in the nucleus in response to calcium-mediated signaling and CaMKII activity. CPEB2, -3, and -4 (but not CPEB1) contain conserved nuclear export signals. Nuclear accumulation of CPEB4 is controlled by ER calcium depletion through the IP3 receptor. CPEB4 is required for cell survival and becomes nuclear in response to focal ischemia in vivo and oxygen-glucose deprivation in vitro.","method":"Subcellular fractionation, immunofluorescence, live imaging, CaMKII inhibition, IP3 receptor manipulation, focal ischemia model, oxygen-glucose deprivation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (fractionation, live imaging, pharmacological inhibition, in vivo ischemia), functional consequence (cell survival) established","pmids":["20937770"],"is_preprint":false},{"year":2011,"finding":"CPEB4 promotes translational activation of mRNAs silenced in normal tissue, including tissue plasminogen activator (tPA) mRNA, through cytoplasmic polyadenylation. This supports tumor growth, vascularization, and invasion in pancreatic ductal adenocarcinoma and glioblastoma.","method":"RNA immunoprecipitation, poly(A) tail assays, siRNA knockdown, xenograft tumor models, luciferase reporter assays","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNA-IP identifying specific target mRNAs, poly(A) tail assays, in vivo xenograft validation, multiple tumor types","pmids":["22138752"],"is_preprint":false},{"year":2014,"finding":"Cpeb4 is induced by erythroid transcription factors Gata1 and Tal1, and interacts with translation initiation factor eIF3 to repress translation of a large set of mRNAs including its own mRNA, forming a negative feedback loop essential for terminal erythropoiesis.","method":"Co-immunoprecipitation (eIF3 interaction), ribosome profiling, siRNA knockdown, primary erythroid cell differentiation assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP identifying eIF3 as binding partner, ribosome profiling, defined cellular phenotype (erythropoiesis failure), transcription factor epistasis","pmids":["25220394"],"is_preprint":false},{"year":2014,"finding":"The tandem RRM domains of CPEB4 are both required for optimal CPE-containing RNA binding. RRM1 alone and tandem RRM1-RRM2 can dimerize as a minor population without affecting RNA binding. NMR shows the two RRM domains are oriented toward each other, with RNA binding occurring on the β-sheet surface of RRM1 and C-terminus of RRM2.","method":"NMR spectroscopy, isothermal titration calorimetry (ITC), electrophoretic mobility shift assay (EMSA), ion mobility-mass spectrometry","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biophysical methods (NMR, ITC, EMSA, IM-MS) providing structural and binding mechanism data in a single rigorous study","pmids":["25081215"],"is_preprint":false},{"year":2014,"finding":"CPEB4 localizes to stress granules under arsenite-induced stress. Vinexin, a SH3-domain adaptor protein, is a CPEB4-interacting protein and novel stress granule component. Arsenite-activated JNK signaling enhances the CPEB4-Vinexin interaction, facilitating Vinexin translocation from focal adhesions to stress granules and promoting stress granule assembly and cell survival.","method":"Co-immunoprecipitation, immunofluorescence, JNK inhibition, siRNA knockdown, cell viability assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP identifying Vinexin as binding partner, functional consequence (stress granule assembly, cell survival), single lab","pmids":["25237887"],"is_preprint":false},{"year":2015,"finding":"CPEB1 promotes alternative nuclear processing of VEGF and CPEB4 mRNAs deleting translational repressor elements. The resulting CPEB4 overexpression then mediates cytoplasmic polyadenylation of VEGF mRNA to increase its translation, driving pathological angiogenesis. CPEB1 and CPEB4 function sequentially and non-redundantly in this pathway.","method":"siRNA knockdown, poly(A) tail assays, 3' RACE, luciferase reporter assays, Matrigel tube formation assay, CPEB-deficient mice, immunoblot","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods, in vivo validation with KO mice, sequential pathway epistasis established","pmids":["26627607"],"is_preprint":false},{"year":2016,"finding":"CPEB4 activity is regulated by ERK2- and Cdk1-mediated hyperphosphorylation in M-phase, which maintains CPEB4 in its monomeric active state. Unphosphorylated CPEB4 phase-separates into inactive liquid-like droplets through its intrinsically disordered N-terminal domain. Cdk1 coordinates CPEB4 activation with CPEB1 inactivation to regulate cell cycle progression.","method":"In vitro kinase assays, phosphomutant analysis, fluorescence microscopy of liquid droplets, cell cycle synchronization, FRET/biophysical assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase reconstitution, mutagenesis of phosphorylation sites, direct visualization of phase separation, mechanistic coordination with CPEB1 via Cdk1 established","pmids":["27802129"],"is_preprint":false},{"year":2016,"finding":"CPEB4 has lineage-specific functions in melanoma: it is required to prevent mitotic aberrations and to progress through G1/S cell cycle checkpoints, and binds to and regulates poly(A) tail length of melanoma-specific target mRNAs including the melanoma drivers MITF and RAB7A.","method":"RNA immunoprecipitation followed by sequencing, poly(A) length tests, siRNA knockdown, cell cycle analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNA-IP sequencing identifying specific bound transcripts, poly(A) length tests, defined cellular phenotypes, validated in clinical biopsies","pmids":["27857118"],"is_preprint":false},{"year":2016,"finding":"The low-complexity N-terminal domain (LCD) of CPEB4, when expressed alone, forms nucleolar aggregates and causes impaired neurodevelopment including reduced motor axon branching and abnormal neuromuscular junction formation. This is associated with altered ribosomal RNA biogenesis, ribosomal protein gene expression, and elevated stress response genes including actin-bundling protein DRR1, which impedes neurite outgrowth.","method":"Transgenic mouse model expressing only CPEB4-LCD, immunofluorescence, rRNA biogenesis assays, gene expression analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic model with defined phenotypes, but mechanistic link between LCD aggregation and specific rRNA/DRR1 pathway is partially inferred","pmids":["27381259"],"is_preprint":false},{"year":2017,"finding":"CPEB4 protein synthesis is regulated by the unfolded protein response (UPR) through upstream open reading frames (uORFs) within the 5'UTR of Cpeb4 mRNA, so that CPEB4 protein is made only following ER stress. Cpeb4 mRNA transcription is controlled by the circadian clock. CPEB4 in turn activates a second wave of UPR translation required to maintain ER and mitochondrial homeostasis, and its deficiency results in non-alcoholic fatty liver disease.","method":"Circadian clock analysis, uORF reporter assays, CPEB4 knockout mice, ER stress induction, high-fat diet model, hepatic function assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO mouse phenotype, uORF mechanism validated by reporter assay, circadian and UPR regulation established with multiple methods","pmids":["28092655"],"is_preprint":false},{"year":2017,"finding":"CPEB4 activates translation of c-Fos mRNA in olfactory bulb granule cells during the early postnatal period in response to olfactory experience; this is required for c-FOS-dependent neurotrophic signaling and granule cell survival. CPEB4-knockout mice show c-FOS insufficiency, reduced neurotrophic signaling, impaired granule cell survival, and olfactory bulb hypoplasia.","method":"CPEB4-knockout mice, immunofluorescence, poly(A) tail assays, electrophysiology, behavioral assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with defined phenotype, specific mRNA target (c-Fos) identified, mechanism linked to neurotrophic signaling pathway","pmids":["29166615"],"is_preprint":false},{"year":2018,"finding":"CPEB4 binds transcripts of most high-confidence ASD risk genes. A neuron-specific 24 bp microexon (exon 4) of CPEB4 is decreased in inclusion in brains of idiopathic ASD patients, resulting in reduced poly(A)-tail length and reduced protein expression of ASD risk gene products. Equivalent microexon imbalance in mice reproduces ASD-like neuroanatomical, electrophysiological, and behavioral phenotypes.","method":"RNA immunoprecipitation, poly(A) tail sequencing, RT-PCR, mouse model with microexon imbalance, electrophysiology, behavioral testing","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide RNA-IP identifying ASD target transcripts, poly(A)-tail sequencing, in vivo mouse model recapitulating human phenotype, human brain validation","pmids":["30111840"],"is_preprint":false},{"year":2020,"finding":"CPEB4 binds to cytoplasmic polyadenylation elements (CPEs) within the 3'-UTR of PFKFB3 mRNA to induce its cytoplasmic polyadenylation and translational upregulation (not transcriptional). This drives glycolysis and activates hepatic stellate cells, promoting liver fibrosis. CPEB4-knockout mice show decreased PFKFB3 and reduced fibrosis.","method":"RNA immunoprecipitation, poly(A) tail assays, siRNA knockdown, CPEB4-KO mice, bile duct ligation fibrosis model","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNA-IP confirming PFKFB3 mRNA binding, poly(A) tail assays, in vivo KO validation, two independent fibrosis models","pmids":["32169429"],"is_preprint":false},{"year":2020,"finding":"Cpeb4 translocates from the cytoplasm to nuclear bodies in response to RANKL stimulation during osteoclast differentiation, dependent on PI3K-Akt and calcium-NFAT signaling pathways. shRNA-mediated Cpeb4 depletion impairs TRAP-positive osteoclast formation and expression of key differentiation markers (Acp5, Ctsk, Nfatc1, Dcstamp), establishing Cpeb4 as a positive regulator of osteoclastogenesis.","method":"Immunofluorescence, shRNA knockdown, PI3K/NFAT inhibition, Western blot","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with functional consequence (osteoclast differentiation failure), pharmacological pathway placement, single lab","pmids":["32517870"],"is_preprint":false},{"year":2021,"finding":"Cpeb4 is identified as a dynamic RNA-binding protein in cardiomyocytes that regulates cardiac growth (hypertrophy) in vitro and in vivo. Cpeb4 binds and represses expression of Zeb1 and Zbtb20 mRNAs; Cpeb4 depletion increases their expression. Cpeb4 loss inhibits pathological cardiomyocyte growth.","method":"RNA interactome capture, RNA immunoprecipitation, in vitro and in vivo cardiac hypertrophy models, siRNA knockdown","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNA interactome capture plus RNA-IP identifying specific targets, in vivo cardiac model, defined cellular phenotype","pmids":["33979607"],"is_preprint":false},{"year":2021,"finding":"CPEB4 and CPEB1 localize to the mitotic spindle and associate with spindle-localized CPE-containing mRNAs and translating ribosomes. CPEB1 and CPEB4 function sequentially: CPEB1 drives metaphase and CPEB4 drives anaphase/cytokinesis by controlling the expression/localization of spindle-associated transcripts.","method":"Immunofluorescence of spindle localization, RNA immunoprecipitation, ribosome association assays, siRNA knockdown, cell cycle analysis","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with functional consequence, RNA-IP of spindle-associated transcripts, sequential function established, single lab","pmids":["33323527"],"is_preprint":false},{"year":2021,"finding":"CPEB4 acts as a translational regulator of CSAG2 (TRAG-3) mRNA by binding its 3'-UTR and inducing cytoplasmic polyadenylation to increase CSAG2 protein expression, which mediates paclitaxel resistance in ovarian cancer cells.","method":"RNA immunoprecipitation, poly(A) tail assay, siRNA knockdown, cell viability assay","journal":"Frontiers in pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-IP confirming mRNA binding, poly(A) tail assay demonstrating polyadenylation, knockdown rescue experiment, single lab","pmids":["33519462"],"is_preprint":false},{"year":2021,"finding":"CircRNA cDOPEY2 acts as a protein scaffold to enhance interaction between CPEB4 and E3 ligase TRIM25, facilitating ubiquitination and proteasomal degradation of CPEB4. Elevated CPEB4 in cisplatin-resistant cells drives Mcl-1 translation via binding to its mRNA 3'-UTR; cDOPEY2-mediated CPEB4 degradation reduces Mcl-1 and restores cisplatin sensitivity.","method":"Mass spectrometry, co-immunoprecipitation, ubiquitination assay, RNA immunoprecipitation, Western blot","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying TRIM25 interaction, ubiquitination assay, RNA-IP for Mcl-1 mRNA binding, multiple methods but single lab","pmids":["34781999"],"is_preprint":false},{"year":2021,"finding":"CPEB4 overexpression in obese adipocytes activates translation of Cebpb, Stat5a, Ccl2, and Tlr4 mRNAs, as demonstrated by RNA-immunoprecipitation and high-throughput sequencing. CPEB4 knockout in mice protects against diet-induced obesity and adipose tissue expansion and inflammation.","method":"RNA immunoprecipitation followed by high-throughput sequencing, CPEB4-KO mice, high-fat diet model, siRNA knockdown","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide RIP-seq identifying specific target mRNAs, in vivo KO mouse validation, functional consequence (obesity protection) established","pmids":["34774811"],"is_preprint":false},{"year":2022,"finding":"CPEB4 stabilizes anti-inflammatory mRNAs containing both CPEs and AREs in their 3'-UTRs in macrophages, opposing TTP-directed mRNA deadenylation. Coordination between CPEB4 and TTP is sequentially regulated through MAPK signaling. CPEB4 depletion impairs inflammation resolution in an LPS-induced sepsis model.","method":"siRNA knockdown, poly(A) tail assays, LPS stimulation, MAPK pathway inhibition, in vivo sepsis model","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — poly(A) tail assays demonstrating mechanism, MAPK pathway epistasis, in vivo sepsis validation, opposing function to TTP established","pmids":["35442882"],"is_preprint":false},{"year":2022,"finding":"CPEB4 is required for translation of interleukin-22 mRNA and other cytokine mRNAs in intestinal immune cells upon tissue injury. CPEB4 is required for development of gut-associated lymphoid tissues and maintenance of intestinal immune homeostasis.","method":"CPEB4 conditional knockout, RNA immunoprecipitation, poly(A) tail assays, intestinal inflammation models","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined phenotype, RNA-IP identifying IL-22 mRNA as target, single lab","pmids":["35243213"],"is_preprint":false},{"year":2023,"finding":"In CD8 T lymphocytes, CPEB4 constitutes a new branch of the UPR activated during T-cell activation and effector function; ER stress triggers CPEB4 expression, and CPEB4 mediates chronic stress adaptation (decoupled from terminal UPR) to maintain cellular fitness, effector molecule production, and cytotoxic activity. CPEB4 disruption in T cells exacerbates tumor growth.","method":"T cell activation assays, ER stress induction, CPEB4 knockdown/KO, cytotoxicity assays, tumor growth models","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined cellular phenotype (cytotoxic function loss), in vivo tumor model, UPR pathway placement, single lab","pmids":["36919984"],"is_preprint":false},{"year":2023,"finding":"Decreased CPEB4 microexon (exon 4) inclusion is found in schizophrenia brains (in antipsychotic-free individuals), correlated with decreased protein levels of CPEB4-target SCZ-associated genes. Mice mildly overexpressing exon 4-lacking CPEB4 (CPEB4Δ4) show decreased protein levels of CPEB4-target SCZ genes and SCZ-linked behaviors.","method":"RT-PCR, Western blot on postmortem brain tissue, CPEB4Δ4 transgenic mice, behavioral testing, MAGMA-enrichment analysis","journal":"Biological psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model recapitulating molecular and behavioral phenotype, human brain validation, single lab","pmids":["36958377"],"is_preprint":false},{"year":2023,"finding":"CPEB4 regulates mitochondrial proteome and activity through mitochondrial translational control in muscle stem cells. CPEB4 loss induces cellular senescence; restoring CPEB4 rescues impaired mitochondrial metabolism and prevents senescence in murine muscle stem cells and human cell lines.","method":"Proteomics of aged muscle stem cells, CPEB4 KO/restoration, mitochondrial function assays, senescence markers","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic analysis, KO with defined phenotype, rescue experiment, but mechanistic link to translational control of mitochondrial transcripts not fully detailed in abstract","pmids":["37321216"],"is_preprint":false},{"year":2023,"finding":"CLOCK binds to recognition sites in the CPEB4 promoter region during status epilepticus to increase Cpeb4 mRNA levels. CPEB4 in turn regulates poly(A) tail length of Clock mRNA, creating a positive transcriptional-translational feedback loop. CPEB4-deficient mice show altered CLOCK expression and altered circadian function.","method":"Chromatin immunoprecipitation (ChIP), poly(A) tail analysis, CPEB4-KO mice, kainic acid epilepsy model, CLOCK overexpression in cells","journal":"Epilepsia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirming CLOCK binding to CPEB4 promoter, poly(A) tail assays for Clock mRNA, in vivo KO validation, single lab","pmids":["37543852"],"is_preprint":false},{"year":2024,"finding":"The neuronal CPEB4 microexon encodes a sequence whose heterotypic interactions with a cluster of histidine residues prevent irreversible CPEB4 aggregation by competing with homotypic interactions between histidine clusters. Neuronal CPEB4 forms condensates that dissolve after depolarization (transition from translational repression to activation). Microexon-lacking CPEB4 (as in ASD) forms irreversible aggregates with dominant-negative effects on ASD risk gene expression.","method":"Phase separation assays, condensate dissolution upon depolarization, NMR/structural analysis of microexon-histidine interactions, ASD patient brain analysis, mouse model","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — mechanistic structural analysis of microexon-histidine interaction, functional validation in neuronal depolarization, mouse model, human ASD brain correlation","pmids":["39633052"],"is_preprint":false},{"year":2024,"finding":"Cpeb4 co-localizes and interacts with splicing factors SRSF5 and SRSF6 in nuclear bodies, where its RNA-binding ability (specifically RRM7 domain) is required for nuclear body localization and regulation of normal splicing of the Id2 gene during osteoclast differentiation. Cpeb4 depletion alters Id2 splicing pattern and elevates expression of cell cycle-related genes.","method":"Co-immunoprecipitation, immunofluorescence, domain deletion mutant analysis, RNA-sequencing, leptomycin B nuclear export inhibition","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying SRSF5/6 interaction, domain mapping (RRM7) for localization, RNA-seq for splicing changes, single lab","pmids":["38284484"],"is_preprint":false},{"year":2024,"finding":"CPEB4 deficiency suppresses hepcidin expression, leading to elevated ferroportin levels, decreased intracellular iron accumulation, and reduced lipid peroxidation, thereby decreasing sensitivity to ferroptosis in liver cancer cells. CPEB4 translationally regulates hepcidin, and CPEB4 KO mice show increased tumor burden in diet-induced liver cancer models.","method":"CPEB4 KO and knockdown mice and cell lines, xenograft models, ferroptosis induction assays, iron/lipid peroxidation measurements","journal":"JHEP reports : innovation in hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO validation, cellular mechanistic assays for ferroptosis pathway, hepcidin as translational target implied but poly(A) assay not explicitly described in abstract","pmids":["39980747"],"is_preprint":false},{"year":2025,"finding":"CPEB4 promotes cytoplasmic polyadenylation and stabilizes SCN5A mRNA, thereby supporting Nav1.5 protein expression and sodium current in cardiomyocytes. Cpeb4 deficiency in mice causes QRS widening, reduced Nav1.5 protein, and decreased sodium current. Restoring Cpeb4 after infarction preserved SCN5A/Nav1.5 and sodium current.","method":"Cpeb4-deficient mice, cardiac electrophysiology (ECG, patch clamp), sodium current measurements, in vivo infarction model with Cpeb4 restoration","journal":"JACC. Basic to translational science","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct electrophysiological readout, specific mRNA target (SCN5A) identified, rescue experiment restoring Cpeb4, in vivo model","pmids":["41846068"],"is_preprint":false},{"year":2025,"finding":"In shock-sensitive rats suppressing methamphetamine self-administration, CPEB4 mRNA levels are increased along with elevated protein levels of its interacting partners CPSF and GLD2. GLD2-regulated GLUN2A mRNA and protein are also increased, suggesting a CPEB4/GLD2 polyadenylation complex regulates NMDA receptor subunit expression in the dorsal striatum.","method":"Differential gene expression analysis, Western blot for CPSF and GLD2 protein levels, mRNA/protein quantification in dorsal striatum","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, correlation-based identification of CPEB4-CPSF-GLD2 complex without direct binding confirmation, no pull-down or Co-IP described","pmids":["40141377"],"is_preprint":false},{"year":2010,"finding":"miR-92 and miR-26 bind conserved target sites in the 3'-UTRs of CPEB2, CPEB3, and CPEB4 at paralog positions, coordinately downregulating all three paralogs by reducing their mRNA levels. Mutagenesis of miRNA-binding sites in reporter constructs confirmed direct targeting.","method":"Luciferase reporter assays, miRNA binding site mutagenesis, miRNA overexpression and depletion, endogenous mRNA level measurement","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct mutagenesis of binding sites in reporters confirms mechanism, but only reporter level validated for CPEB4 specifically, not full functional consequence","pmids":["20660482"],"is_preprint":false}],"current_model":"CPEB4 is a sequence-specific RNA-binding protein that regulates mRNA translation and stability by modulating cytoplasmic poly(A) tail length through binding to cytoplasmic polyadenylation elements (CPEs) in target mRNA 3'-UTRs; its activity is controlled by ERK2/Cdk1-mediated phosphorylation and by liquid-liquid phase separation of its intrinsically disordered N-terminal domain (a process regulated by a neuron-specific microexon that prevents irreversible aggregation), it shuttles between nucleus and cytoplasm in a CaMKII- and ER calcium-dependent manner, it interacts with eIF3 to repress translation and with GLD2/CPSF for polyadenylation, and it functions sequentially with CPEB1 in both meiotic and mitotic cell cycles, as well as in diverse physiological contexts including liver ER stress adaptation (via circadian/UPR dual control), inflammation resolution (opposing TTP-mediated mRNA decay via MAPK signaling), erythropoiesis, muscle stem cell mitochondrial homeostasis, cardiac sodium channel (SCN5A/Nav1.5) mRNA stability, and translational reprogramming in cancer, fibrosis, and neurological disease."},"narrative":{"mechanistic_narrative":"CPEB4 is a sequence-specific RNA-binding protein that controls mRNA translation and stability by binding cytoplasmic polyadenylation elements (CPEs) in target 3'-UTRs and modulating cytoplasmic poly(A) tail length, with binding specificity distinct from CPEB1 and mediated by its tandem RRM domains [PMID:17024188, PMID:25081215]. Depending on context it either activates translation by directing cytoplasmic polyadenylation—of targets such as tPA, VEGF, MITF/RAB7A, PFKFB3, c-Fos, IL-22, and SCN5A [PMID:22138752, PMID:26627607, PMID:27857118, PMID:32169429, PMID:29166615, PMID:35243213, PMID:41846068]—or represses translation, including through interaction with the eIF3 initiation complex during terminal erythropoiesis [PMID:25220394]. CPEB4 functions sequentially and non-redundantly with CPEB1 across the meiotic and mitotic cell cycles: CPEB1 polyadenylates CPEB4 mRNA to activate it, after which CPEB4 takes over to drive M-phase and anaphase/cytokinesis transitions via spindle-associated CPE mRNAs [PMID:20364142, PMID:20531391, PMID:33323527]. Its activity is gated by ERK2/Cdk1 hyperphosphorylation, which maintains the active monomeric state, whereas the unphosphorylated intrinsically disordered N-terminal domain undergoes liquid-liquid phase separation into inactive condensates [PMID:27802129]; in neurons, a 24-bp microexon encodes histidine-cluster heterotypic interactions that keep these condensates reversible and prevent the irreversible aggregation seen when the microexon is lost in autism spectrum disorder and schizophrenia brains [PMID:39633052, PMID:30111840, PMID:36958377]. CPEB4 shuttles between nucleus and cytoplasm under calcium- and CaMKII-dependent control linked to ER calcium and the IP3 receptor [PMID:20937770]. Through these mechanisms CPEB4 coordinates stress-adaptive translational reprogramming in liver ER-stress/UPR and circadian control [PMID:28092655, PMID:37543852], inflammation resolution by opposing TTP-mediated mRNA decay [PMID:35442882], and disease-relevant programs in cancer, fibrosis, and cardiac sodium-channel homeostasis [PMID:22138752, PMID:32169429, PMID:41846068].","teleology":[{"year":2006,"claim":"Established that CPEB4 is a distinct RNA-binding protein with sequence specificity different from CPEB1, answering whether the CPEB paralogs are functionally redundant.","evidence":"SELEX, RNA structure probing and footprinting comparing CPEB1, CPEB3, and CPEB4 binding","pmids":["17024188"],"confidence":"High","gaps":["Did not define in vivo target mRNAs","Structural basis of specificity not resolved"]},{"year":2010,"claim":"Showed CPEB4 acts sequentially after CPEB1 in both meiosis and mitosis, resolving how successive cell-cycle transitions are coupled to phase-specific poly(A) changes.","evidence":"siRNA/KO with poly(A) tail and cell-cycle assays in mitotic cells, and Xenopus oocyte meiotic progression with kinase-inhibitor and reporter assays","pmids":["20364142","20531391"],"confidence":"High","gaps":["Kinases distinguishing CPEB1 vs CPEB4 timing not fully defined here","Full target mRNA set per phase not enumerated"]},{"year":2010,"claim":"Identified calcium/CaMKII- and ER-calcium-dependent nucleocytoplasmic shuttling and a role in cell survival, answering how CPEB4 localization is signal-regulated.","evidence":"Subcellular fractionation, live imaging, CaMKII and IP3R manipulation, in vivo focal ischemia and oxygen-glucose deprivation","pmids":["20937770"],"confidence":"High","gaps":["Nuclear function of CPEB4 not defined","Export machinery beyond NES not identified"]},{"year":2014,"claim":"Defined the structural basis of CPE recognition, showing both tandem RRMs are required and how they engage RNA.","evidence":"NMR, ITC, EMSA, and ion mobility-mass spectrometry of RRM1-RRM2","pmids":["25081215"],"confidence":"High","gaps":["Did not address the N-terminal IDR contribution","Affinity differences among physiological targets not mapped"]},{"year":2014,"claim":"Revealed a repressive mode via eIF3 and an autoregulatory negative feedback loop essential for terminal erythropoiesis, broadening CPEB4 beyond polyadenylation-driven activation.","evidence":"Co-IP of eIF3, ribosome profiling, siRNA, and primary erythroid differentiation downstream of Gata1/Tal1","pmids":["25220394"],"confidence":"High","gaps":["Switch between repressive and activating modes not mechanistically defined","eIF3 subunit contact points unresolved"]},{"year":2016,"claim":"Demonstrated that ERK2/Cdk1 phosphorylation controls a phase-separation switch governing CPEB4 activity and coordinates it with CPEB1 inactivation.","evidence":"In vitro kinase assays, phosphomutants, droplet microscopy, cell-cycle synchronization, biophysical assays","pmids":["27802129"],"confidence":"High","gaps":["In vivo condensate dynamics during division not directly imaged","Phosphatase reversing this state not identified"]},{"year":2011,"claim":"Linked CPEB4-driven cytoplasmic polyadenylation to oncogenic translational reprogramming in solid tumors, showing pathological reactivation of silenced mRNAs.","evidence":"RNA-IP, poly(A) assays, siRNA, luciferase reporters, and xenografts in pancreatic cancer and glioblastoma","pmids":["22138752"],"confidence":"High","gaps":["Full oncogenic target network incomplete","Upstream signal activating CPEB4 in tumors not defined"]},{"year":2016,"claim":"Extended CPEB4 cell-cycle and target control to melanoma drivers MITF/RAB7A, showing lineage-specific target repertoires.","evidence":"RIP-seq, poly(A) length tests, siRNA, cell-cycle analysis, clinical biopsy validation","pmids":["27857118"],"confidence":"High","gaps":["Determinants of lineage-specific target selection unknown"]},{"year":2015,"claim":"Showed CPEB1 nuclear processing of VEGF and CPEB4 mRNAs licenses CPEB4 to drive pathological angiogenesis, integrating nuclear and cytoplasmic regulation.","evidence":"siRNA, poly(A) assays, 3' RACE, tube formation, CPEB-deficient mice","pmids":["26627607"],"confidence":"High","gaps":["Mechanism of CPEB1-directed alternative processing not fully detailed"]},{"year":2017,"claim":"Established CPEB4 as a UPR- and circadian-gated effector maintaining hepatic ER/mitochondrial homeostasis, defining a translational stress-adaptation circuit.","evidence":"Circadian analysis, uORF reporters, CPEB4 KO mice, ER-stress and high-fat-diet liver models","pmids":["28092655"],"confidence":"High","gaps":["Second-wave UPR target mRNAs not enumerated","uORF-sensing factor not identified"]},{"year":2017,"claim":"Identified c-Fos as a CPEB4 target in olfactory bulb granule cells, linking CPEB4 translational control to neuronal survival.","evidence":"CPEB4 KO mice, immunofluorescence, poly(A) assays, electrophysiology, behavior","pmids":["29166615"],"confidence":"High","gaps":["Signal coupling olfactory experience to CPEB4 activity not detailed"]},{"year":2018,"claim":"Connected a neuron-specific CPEB4 microexon to autism by showing its loss reduces poly(A) length and protein output of ASD risk genes, providing a unifying regulatory hub.","evidence":"RNA-IP, poly(A)-tail sequencing, RT-PCR, microexon-imbalance mouse model with human brain validation","pmids":["30111840"],"confidence":"High","gaps":["Mechanism by which microexon loss alters activity left to later structural work","Splicing regulator controlling microexon inclusion not identified here"]},{"year":2024,"claim":"Provided the molecular explanation for the microexon, showing it encodes histidine-cluster heterotypic interactions that keep neuronal condensates reversible and prevent dominant-negative aggregation.","evidence":"Phase separation and depolarization-dependent dissolution assays, structural analysis of microexon-histidine interactions, ASD brain and mouse models","pmids":["39633052"],"confidence":"High","gaps":["In vivo condensate dynamics in human neurons not directly observed"]},{"year":2020,"claim":"Showed CPEB4 drives PFKFB3-dependent glycolysis to activate hepatic stellate cells, defining a metabolic-translational axis in fibrosis.","evidence":"RNA-IP, poly(A) assays, siRNA, CPEB4 KO mice, bile-duct ligation","pmids":["32169429"],"confidence":"High","gaps":["Whether the same axis operates in non-hepatic fibrosis untested"]},{"year":2022,"claim":"Established that CPEB4 stabilizes anti-inflammatory CPE/ARE mRNAs by opposing TTP deadenylation under MAPK control, defining its role in inflammation resolution.","evidence":"siRNA, poly(A) assays, LPS stimulation, MAPK inhibition, in vivo sepsis model","pmids":["35442882"],"confidence":"High","gaps":["Direct competition vs TTP at shared 3'-UTRs not biochemically reconstituted"]},{"year":2021,"claim":"Identified CPEB4 as a translational regulator of cardiac growth, repressing Zeb1/Zbtb20 to restrain pathological hypertrophy.","evidence":"RNA interactome capture, RNA-IP, siRNA, in vitro and in vivo hypertrophy models","pmids":["33979607"],"confidence":"High","gaps":["Repressive vs activating mode at these targets not mechanistically separated"]},{"year":2021,"claim":"Showed CPEB4 promotes diet-induced obesity by activating translation of inflammatory/metabolic mRNAs (Cebpb, Stat5a, Ccl2, Tlr4) in adipocytes.","evidence":"RIP-seq, CPEB4 KO mice, high-fat diet, siRNA","pmids":["34774811"],"confidence":"High","gaps":["Signal activating CPEB4 in obese adipocytes not defined"]},{"year":2025,"claim":"Demonstrated CPEB4 stabilizes SCN5A mRNA to sustain Nav1.5 sodium current, with restoration rescuing post-infarction conduction defects.","evidence":"Cpeb4-deficient mice, ECG, patch clamp, sodium-current measurement, infarction-restoration model","pmids":["41846068"],"confidence":"High","gaps":["Whether stabilization is purely poly(A)-mediated not fully isolated","Other cardiac ion-channel targets not surveyed"]},{"year":2024,"claim":"Revealed a nuclear splicing-regulatory role, with CPEB4 interacting with SRSF5/SRSF6 in nuclear bodies via its RNA-binding (RRM7) capacity to regulate Id2 splicing.","evidence":"Co-IP, immunofluorescence, domain-deletion mutants, RNA-seq, leptomycin B export inhibition during osteoclast differentiation","pmids":["38284484"],"confidence":"Medium","gaps":["Single-lab; direct CPEB4 binding to spliced pre-mRNA not shown","Generality beyond osteoclasts untested"]},{"year":null,"claim":"How CPEB4 switches between translational activation and repression on a given target, and how its phosphorylation/phase-separation state, nuclear splicing role, and shuttling are integrated in vivo, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of activator-vs-repressor mode selection","Nuclear functions (splicing, shuttling purpose) mechanistically incomplete","Phosphatase and condensate-resolution machinery in non-neuronal cells unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,4,6,10,14,17]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[1,2,4,8,15]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[5,13,22,23]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[5,22]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,7,9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,16,29]},{"term_id":"GO:0005815","term_label":"microtubule organizing 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RNA binding results in a clear conformational change analogous to the Venus fly trap mechanism (PubMed:24990967). Regulates activation of unfolded protein response (UPR) in the process of adaptation to ER stress in liver, by maintaining translation of CPE-regulated mRNAs in conditions in which global protein synthesis is inhibited (By similarity). Required for cell cycle progression, specifically for cytokinesis and chromosomal segregation (PubMed:26398195). Plays a role as an oncogene promoting tumor growth and progression by positively regulating translation of t-plasminogen activator/PLAT (PubMed:22138752). Stimulates proliferation of melanocytes (PubMed:27857118). In contrast to CPEB1 and CPEB3, does not play role in synaptic plasticity, learning and memory (By similarity)","subcellular_location":"Cytoplasm; Cell projection, dendrite; Cell projection, dendritic spine; Postsynaptic density; Cell projection, axon; Cell projection, growth cone; Endoplasmic reticulum; Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/Q17RY0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CPEB4","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CPEB4","total_profiled":1310},"omim":[{"mim_id":"620263","title":"OOCYTE-SECRETED PROTEIN 2; OOSP2","url":"https://www.omim.org/entry/620263"},{"mim_id":"610607","title":"CYTOPLASMIC 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pyroptosis induced by chronic cerebral ischemia through phosphorylation of Ehf.","date":"2024","source":"Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/38513137","citation_count":4,"is_preprint":false},{"pmid":"30728769","id":"PMC_30728769","title":"CPEB4-Dependent Neonate-Born Granule Cells Are Required for Olfactory Discrimination.","date":"2019","source":"Frontiers in behavioral neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/30728769","citation_count":4,"is_preprint":false},{"pmid":"37667097","id":"PMC_37667097","title":"Hsa_circ_0000069 Accelerates Cervical Cancer Progression by Sponging miR-1270 to Facilitate CPEB4 Expression.","date":"2023","source":"Biochemical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/37667097","citation_count":3,"is_preprint":false},{"pmid":"38130149","id":"PMC_38130149","title":"miRNA-130a-3p/CPEB4 Axis Modulates Glioblastoma Growth and Progression.","date":"2023","source":"Technology in cancer research & treatment","url":"https://pubmed.ncbi.nlm.nih.gov/38130149","citation_count":2,"is_preprint":false},{"pmid":"38305290","id":"PMC_38305290","title":"Down-Regulation of CPEB4 Alleviates Preeclampsia through the Inhibition of Ferroptosis by PFKFB3.","date":"2024","source":"Critical reviews in eukaryotic gene expression","url":"https://pubmed.ncbi.nlm.nih.gov/38305290","citation_count":2,"is_preprint":false},{"pmid":"29986574","id":"PMC_29986574","title":"[The research progress of CPEB4 in tumor].","date":"2018","source":"Lin chuang er bi yan hou tou jing wai ke za zhi = Journal of clinical otorhinolaryngology head and neck surgery","url":"https://pubmed.ncbi.nlm.nih.gov/29986574","citation_count":2,"is_preprint":false},{"pmid":"37750623","id":"PMC_37750623","title":"CYP24A1, AHR, CPEB4, TRIP13, and PIK3CA genes expression in colorectal cancer patients: novel diagnostic 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zhi","url":"https://pubmed.ncbi.nlm.nih.gov/32798388","citation_count":0,"is_preprint":false},{"pmid":"31839038","id":"PMC_31839038","title":"[Effect of CPEB4 on Proliferation and Apoptosis of Chronic Myeloid Leukemia Cells].","date":"2019","source":"Zhongguo shi yan xue ye xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/31839038","citation_count":0,"is_preprint":false},{"pmid":"40892227","id":"PMC_40892227","title":"Single-cell sequencing analysis and multiple machine learning methods identified immune-associated SERPINB1 and CPEB4 as novel biomarkers for COVID-19-induced ARDS.","date":"2025","source":"Die Naturwissenschaften","url":"https://pubmed.ncbi.nlm.nih.gov/40892227","citation_count":0,"is_preprint":false},{"pmid":"42209191","id":"PMC_42209191","title":"CPEB4 deficiency promotes vasculogenic mimicry and resistance to anti-angiogenic therapy in hepatocellular 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Function","date":"2025-10-08","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.08.681108","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.25.620162","title":"OLIGONUCLEOTIDES TARGETING THE 3’ SPLICE SITE DOWNSTREAM OF A MICROEXON AS AN INNOVATIVE THERAPY FOR AUTISM","date":"2024-10-25","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.25.620162","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.06.05.658128","title":"Mammalian epigenomic conservation of promoters and enhancers in the heart associates with trait-associated variation and impacts cardiomyocyte phenotypes","date":"2025-06-08","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.05.658128","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.12.19.629410","title":"Genome-wide association analyses in dairy heifers highlight genes overlapping with mouse and human fertility and human health traits","date":"2024-12-21","source":"bioRxiv","url":"https://doi.org/10.1101/2024.12.19.629410","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":39849,"output_tokens":8645,"usd":0.124611,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18708,"output_tokens":5538,"usd":0.115995,"stage2_stop_reason":"end_turn"},"total_usd":0.240606,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"CPEB3 and CPEB4 interact with different RNA sequences than CPEB1, as determined by SELEX, RNA structure probing, and RNA footprinting, establishing them as distinct classes of RNA-binding proteins with different binding specificities.\",\n      \"method\": \"SELEX, RNA structure probing, RNA footprinting\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biochemical methods (SELEX, structure probing, footprinting) in a single rigorous study\",\n      \"pmids\": [\"17024188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CPEB4 mediates cytoplasmic polyadenylation-dependent translational control specifically required for M-phase entry in mitotically dividing cells. CPEB1 and CPEB4 act sequentially: CPEB1 regulates G2/M mRNAs and CPEB4 regulates M-phase mRNAs through phase-specific poly(A) tail length changes.\",\n      \"method\": \"Loss-of-function (siRNA/KO), poly(A) tail length assays, cell cycle analysis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — defined cellular phenotype (M-phase entry failure), poly(A) tail assays, replicated across mitotic cell lines and supported by epistasis with CPEB1\",\n      \"pmids\": [\"20364142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CPEB1 activates translation of CPEB4 mRNA during meiosis by cytoplasmic polyadenylation, generating a positive feedback loop. CPEB4 then replaces CPEB1 after its degradation at meiosis I and drives the metaphase I to metaphase II transition. CPEB1 and CPEB4 are differentially regulated by phase-specific kinases.\",\n      \"method\": \"Xenopus oocyte meiotic progression assays, poly(A) tail assays, kinase inhibitor experiments, translation reporter assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods in Xenopus meiosis, epistasis established, replicated by independent group (PMID:20364142)\",\n      \"pmids\": [\"20531391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CPEB4 is a nucleus-cytoplasm shuttling protein that accumulates in the nucleus in response to calcium-mediated signaling and CaMKII activity. CPEB2, -3, and -4 (but not CPEB1) contain conserved nuclear export signals. Nuclear accumulation of CPEB4 is controlled by ER calcium depletion through the IP3 receptor. CPEB4 is required for cell survival and becomes nuclear in response to focal ischemia in vivo and oxygen-glucose deprivation in vitro.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence, live imaging, CaMKII inhibition, IP3 receptor manipulation, focal ischemia model, oxygen-glucose deprivation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (fractionation, live imaging, pharmacological inhibition, in vivo ischemia), functional consequence (cell survival) established\",\n      \"pmids\": [\"20937770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CPEB4 promotes translational activation of mRNAs silenced in normal tissue, including tissue plasminogen activator (tPA) mRNA, through cytoplasmic polyadenylation. This supports tumor growth, vascularization, and invasion in pancreatic ductal adenocarcinoma and glioblastoma.\",\n      \"method\": \"RNA immunoprecipitation, poly(A) tail assays, siRNA knockdown, xenograft tumor models, luciferase reporter assays\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNA-IP identifying specific target mRNAs, poly(A) tail assays, in vivo xenograft validation, multiple tumor types\",\n      \"pmids\": [\"22138752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cpeb4 is induced by erythroid transcription factors Gata1 and Tal1, and interacts with translation initiation factor eIF3 to repress translation of a large set of mRNAs including its own mRNA, forming a negative feedback loop essential for terminal erythropoiesis.\",\n      \"method\": \"Co-immunoprecipitation (eIF3 interaction), ribosome profiling, siRNA knockdown, primary erythroid cell differentiation assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP identifying eIF3 as binding partner, ribosome profiling, defined cellular phenotype (erythropoiesis failure), transcription factor epistasis\",\n      \"pmids\": [\"25220394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The tandem RRM domains of CPEB4 are both required for optimal CPE-containing RNA binding. RRM1 alone and tandem RRM1-RRM2 can dimerize as a minor population without affecting RNA binding. NMR shows the two RRM domains are oriented toward each other, with RNA binding occurring on the β-sheet surface of RRM1 and C-terminus of RRM2.\",\n      \"method\": \"NMR spectroscopy, isothermal titration calorimetry (ITC), electrophoretic mobility shift assay (EMSA), ion mobility-mass spectrometry\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biophysical methods (NMR, ITC, EMSA, IM-MS) providing structural and binding mechanism data in a single rigorous study\",\n      \"pmids\": [\"25081215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CPEB4 localizes to stress granules under arsenite-induced stress. Vinexin, a SH3-domain adaptor protein, is a CPEB4-interacting protein and novel stress granule component. Arsenite-activated JNK signaling enhances the CPEB4-Vinexin interaction, facilitating Vinexin translocation from focal adhesions to stress granules and promoting stress granule assembly and cell survival.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, JNK inhibition, siRNA knockdown, cell viability assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP identifying Vinexin as binding partner, functional consequence (stress granule assembly, cell survival), single lab\",\n      \"pmids\": [\"25237887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CPEB1 promotes alternative nuclear processing of VEGF and CPEB4 mRNAs deleting translational repressor elements. The resulting CPEB4 overexpression then mediates cytoplasmic polyadenylation of VEGF mRNA to increase its translation, driving pathological angiogenesis. CPEB1 and CPEB4 function sequentially and non-redundantly in this pathway.\",\n      \"method\": \"siRNA knockdown, poly(A) tail assays, 3' RACE, luciferase reporter assays, Matrigel tube formation assay, CPEB-deficient mice, immunoblot\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods, in vivo validation with KO mice, sequential pathway epistasis established\",\n      \"pmids\": [\"26627607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CPEB4 activity is regulated by ERK2- and Cdk1-mediated hyperphosphorylation in M-phase, which maintains CPEB4 in its monomeric active state. Unphosphorylated CPEB4 phase-separates into inactive liquid-like droplets through its intrinsically disordered N-terminal domain. Cdk1 coordinates CPEB4 activation with CPEB1 inactivation to regulate cell cycle progression.\",\n      \"method\": \"In vitro kinase assays, phosphomutant analysis, fluorescence microscopy of liquid droplets, cell cycle synchronization, FRET/biophysical assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase reconstitution, mutagenesis of phosphorylation sites, direct visualization of phase separation, mechanistic coordination with CPEB1 via Cdk1 established\",\n      \"pmids\": [\"27802129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CPEB4 has lineage-specific functions in melanoma: it is required to prevent mitotic aberrations and to progress through G1/S cell cycle checkpoints, and binds to and regulates poly(A) tail length of melanoma-specific target mRNAs including the melanoma drivers MITF and RAB7A.\",\n      \"method\": \"RNA immunoprecipitation followed by sequencing, poly(A) length tests, siRNA knockdown, cell cycle analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNA-IP sequencing identifying specific bound transcripts, poly(A) length tests, defined cellular phenotypes, validated in clinical biopsies\",\n      \"pmids\": [\"27857118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The low-complexity N-terminal domain (LCD) of CPEB4, when expressed alone, forms nucleolar aggregates and causes impaired neurodevelopment including reduced motor axon branching and abnormal neuromuscular junction formation. This is associated with altered ribosomal RNA biogenesis, ribosomal protein gene expression, and elevated stress response genes including actin-bundling protein DRR1, which impedes neurite outgrowth.\",\n      \"method\": \"Transgenic mouse model expressing only CPEB4-LCD, immunofluorescence, rRNA biogenesis assays, gene expression analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic model with defined phenotypes, but mechanistic link between LCD aggregation and specific rRNA/DRR1 pathway is partially inferred\",\n      \"pmids\": [\"27381259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CPEB4 protein synthesis is regulated by the unfolded protein response (UPR) through upstream open reading frames (uORFs) within the 5'UTR of Cpeb4 mRNA, so that CPEB4 protein is made only following ER stress. Cpeb4 mRNA transcription is controlled by the circadian clock. CPEB4 in turn activates a second wave of UPR translation required to maintain ER and mitochondrial homeostasis, and its deficiency results in non-alcoholic fatty liver disease.\",\n      \"method\": \"Circadian clock analysis, uORF reporter assays, CPEB4 knockout mice, ER stress induction, high-fat diet model, hepatic function assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO mouse phenotype, uORF mechanism validated by reporter assay, circadian and UPR regulation established with multiple methods\",\n      \"pmids\": [\"28092655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CPEB4 activates translation of c-Fos mRNA in olfactory bulb granule cells during the early postnatal period in response to olfactory experience; this is required for c-FOS-dependent neurotrophic signaling and granule cell survival. CPEB4-knockout mice show c-FOS insufficiency, reduced neurotrophic signaling, impaired granule cell survival, and olfactory bulb hypoplasia.\",\n      \"method\": \"CPEB4-knockout mice, immunofluorescence, poly(A) tail assays, electrophysiology, behavioral assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with defined phenotype, specific mRNA target (c-Fos) identified, mechanism linked to neurotrophic signaling pathway\",\n      \"pmids\": [\"29166615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CPEB4 binds transcripts of most high-confidence ASD risk genes. A neuron-specific 24 bp microexon (exon 4) of CPEB4 is decreased in inclusion in brains of idiopathic ASD patients, resulting in reduced poly(A)-tail length and reduced protein expression of ASD risk gene products. Equivalent microexon imbalance in mice reproduces ASD-like neuroanatomical, electrophysiological, and behavioral phenotypes.\",\n      \"method\": \"RNA immunoprecipitation, poly(A) tail sequencing, RT-PCR, mouse model with microexon imbalance, electrophysiology, behavioral testing\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide RNA-IP identifying ASD target transcripts, poly(A)-tail sequencing, in vivo mouse model recapitulating human phenotype, human brain validation\",\n      \"pmids\": [\"30111840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CPEB4 binds to cytoplasmic polyadenylation elements (CPEs) within the 3'-UTR of PFKFB3 mRNA to induce its cytoplasmic polyadenylation and translational upregulation (not transcriptional). This drives glycolysis and activates hepatic stellate cells, promoting liver fibrosis. CPEB4-knockout mice show decreased PFKFB3 and reduced fibrosis.\",\n      \"method\": \"RNA immunoprecipitation, poly(A) tail assays, siRNA knockdown, CPEB4-KO mice, bile duct ligation fibrosis model\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNA-IP confirming PFKFB3 mRNA binding, poly(A) tail assays, in vivo KO validation, two independent fibrosis models\",\n      \"pmids\": [\"32169429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cpeb4 translocates from the cytoplasm to nuclear bodies in response to RANKL stimulation during osteoclast differentiation, dependent on PI3K-Akt and calcium-NFAT signaling pathways. shRNA-mediated Cpeb4 depletion impairs TRAP-positive osteoclast formation and expression of key differentiation markers (Acp5, Ctsk, Nfatc1, Dcstamp), establishing Cpeb4 as a positive regulator of osteoclastogenesis.\",\n      \"method\": \"Immunofluorescence, shRNA knockdown, PI3K/NFAT inhibition, Western blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with functional consequence (osteoclast differentiation failure), pharmacological pathway placement, single lab\",\n      \"pmids\": [\"32517870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cpeb4 is identified as a dynamic RNA-binding protein in cardiomyocytes that regulates cardiac growth (hypertrophy) in vitro and in vivo. Cpeb4 binds and represses expression of Zeb1 and Zbtb20 mRNAs; Cpeb4 depletion increases their expression. Cpeb4 loss inhibits pathological cardiomyocyte growth.\",\n      \"method\": \"RNA interactome capture, RNA immunoprecipitation, in vitro and in vivo cardiac hypertrophy models, siRNA knockdown\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNA interactome capture plus RNA-IP identifying specific targets, in vivo cardiac model, defined cellular phenotype\",\n      \"pmids\": [\"33979607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CPEB4 and CPEB1 localize to the mitotic spindle and associate with spindle-localized CPE-containing mRNAs and translating ribosomes. CPEB1 and CPEB4 function sequentially: CPEB1 drives metaphase and CPEB4 drives anaphase/cytokinesis by controlling the expression/localization of spindle-associated transcripts.\",\n      \"method\": \"Immunofluorescence of spindle localization, RNA immunoprecipitation, ribosome association assays, siRNA knockdown, cell cycle analysis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with functional consequence, RNA-IP of spindle-associated transcripts, sequential function established, single lab\",\n      \"pmids\": [\"33323527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CPEB4 acts as a translational regulator of CSAG2 (TRAG-3) mRNA by binding its 3'-UTR and inducing cytoplasmic polyadenylation to increase CSAG2 protein expression, which mediates paclitaxel resistance in ovarian cancer cells.\",\n      \"method\": \"RNA immunoprecipitation, poly(A) tail assay, siRNA knockdown, cell viability assay\",\n      \"journal\": \"Frontiers in pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-IP confirming mRNA binding, poly(A) tail assay demonstrating polyadenylation, knockdown rescue experiment, single lab\",\n      \"pmids\": [\"33519462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CircRNA cDOPEY2 acts as a protein scaffold to enhance interaction between CPEB4 and E3 ligase TRIM25, facilitating ubiquitination and proteasomal degradation of CPEB4. Elevated CPEB4 in cisplatin-resistant cells drives Mcl-1 translation via binding to its mRNA 3'-UTR; cDOPEY2-mediated CPEB4 degradation reduces Mcl-1 and restores cisplatin sensitivity.\",\n      \"method\": \"Mass spectrometry, co-immunoprecipitation, ubiquitination assay, RNA immunoprecipitation, Western blot\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying TRIM25 interaction, ubiquitination assay, RNA-IP for Mcl-1 mRNA binding, multiple methods but single lab\",\n      \"pmids\": [\"34781999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CPEB4 overexpression in obese adipocytes activates translation of Cebpb, Stat5a, Ccl2, and Tlr4 mRNAs, as demonstrated by RNA-immunoprecipitation and high-throughput sequencing. CPEB4 knockout in mice protects against diet-induced obesity and adipose tissue expansion and inflammation.\",\n      \"method\": \"RNA immunoprecipitation followed by high-throughput sequencing, CPEB4-KO mice, high-fat diet model, siRNA knockdown\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide RIP-seq identifying specific target mRNAs, in vivo KO mouse validation, functional consequence (obesity protection) established\",\n      \"pmids\": [\"34774811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CPEB4 stabilizes anti-inflammatory mRNAs containing both CPEs and AREs in their 3'-UTRs in macrophages, opposing TTP-directed mRNA deadenylation. Coordination between CPEB4 and TTP is sequentially regulated through MAPK signaling. CPEB4 depletion impairs inflammation resolution in an LPS-induced sepsis model.\",\n      \"method\": \"siRNA knockdown, poly(A) tail assays, LPS stimulation, MAPK pathway inhibition, in vivo sepsis model\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — poly(A) tail assays demonstrating mechanism, MAPK pathway epistasis, in vivo sepsis validation, opposing function to TTP established\",\n      \"pmids\": [\"35442882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CPEB4 is required for translation of interleukin-22 mRNA and other cytokine mRNAs in intestinal immune cells upon tissue injury. CPEB4 is required for development of gut-associated lymphoid tissues and maintenance of intestinal immune homeostasis.\",\n      \"method\": \"CPEB4 conditional knockout, RNA immunoprecipitation, poly(A) tail assays, intestinal inflammation models\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined phenotype, RNA-IP identifying IL-22 mRNA as target, single lab\",\n      \"pmids\": [\"35243213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In CD8 T lymphocytes, CPEB4 constitutes a new branch of the UPR activated during T-cell activation and effector function; ER stress triggers CPEB4 expression, and CPEB4 mediates chronic stress adaptation (decoupled from terminal UPR) to maintain cellular fitness, effector molecule production, and cytotoxic activity. CPEB4 disruption in T cells exacerbates tumor growth.\",\n      \"method\": \"T cell activation assays, ER stress induction, CPEB4 knockdown/KO, cytotoxicity assays, tumor growth models\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined cellular phenotype (cytotoxic function loss), in vivo tumor model, UPR pathway placement, single lab\",\n      \"pmids\": [\"36919984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Decreased CPEB4 microexon (exon 4) inclusion is found in schizophrenia brains (in antipsychotic-free individuals), correlated with decreased protein levels of CPEB4-target SCZ-associated genes. Mice mildly overexpressing exon 4-lacking CPEB4 (CPEB4Δ4) show decreased protein levels of CPEB4-target SCZ genes and SCZ-linked behaviors.\",\n      \"method\": \"RT-PCR, Western blot on postmortem brain tissue, CPEB4Δ4 transgenic mice, behavioral testing, MAGMA-enrichment analysis\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model recapitulating molecular and behavioral phenotype, human brain validation, single lab\",\n      \"pmids\": [\"36958377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CPEB4 regulates mitochondrial proteome and activity through mitochondrial translational control in muscle stem cells. CPEB4 loss induces cellular senescence; restoring CPEB4 rescues impaired mitochondrial metabolism and prevents senescence in murine muscle stem cells and human cell lines.\",\n      \"method\": \"Proteomics of aged muscle stem cells, CPEB4 KO/restoration, mitochondrial function assays, senescence markers\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic analysis, KO with defined phenotype, rescue experiment, but mechanistic link to translational control of mitochondrial transcripts not fully detailed in abstract\",\n      \"pmids\": [\"37321216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CLOCK binds to recognition sites in the CPEB4 promoter region during status epilepticus to increase Cpeb4 mRNA levels. CPEB4 in turn regulates poly(A) tail length of Clock mRNA, creating a positive transcriptional-translational feedback loop. CPEB4-deficient mice show altered CLOCK expression and altered circadian function.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), poly(A) tail analysis, CPEB4-KO mice, kainic acid epilepsy model, CLOCK overexpression in cells\",\n      \"journal\": \"Epilepsia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirming CLOCK binding to CPEB4 promoter, poly(A) tail assays for Clock mRNA, in vivo KO validation, single lab\",\n      \"pmids\": [\"37543852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The neuronal CPEB4 microexon encodes a sequence whose heterotypic interactions with a cluster of histidine residues prevent irreversible CPEB4 aggregation by competing with homotypic interactions between histidine clusters. Neuronal CPEB4 forms condensates that dissolve after depolarization (transition from translational repression to activation). Microexon-lacking CPEB4 (as in ASD) forms irreversible aggregates with dominant-negative effects on ASD risk gene expression.\",\n      \"method\": \"Phase separation assays, condensate dissolution upon depolarization, NMR/structural analysis of microexon-histidine interactions, ASD patient brain analysis, mouse model\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mechanistic structural analysis of microexon-histidine interaction, functional validation in neuronal depolarization, mouse model, human ASD brain correlation\",\n      \"pmids\": [\"39633052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cpeb4 co-localizes and interacts with splicing factors SRSF5 and SRSF6 in nuclear bodies, where its RNA-binding ability (specifically RRM7 domain) is required for nuclear body localization and regulation of normal splicing of the Id2 gene during osteoclast differentiation. Cpeb4 depletion alters Id2 splicing pattern and elevates expression of cell cycle-related genes.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, domain deletion mutant analysis, RNA-sequencing, leptomycin B nuclear export inhibition\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying SRSF5/6 interaction, domain mapping (RRM7) for localization, RNA-seq for splicing changes, single lab\",\n      \"pmids\": [\"38284484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CPEB4 deficiency suppresses hepcidin expression, leading to elevated ferroportin levels, decreased intracellular iron accumulation, and reduced lipid peroxidation, thereby decreasing sensitivity to ferroptosis in liver cancer cells. CPEB4 translationally regulates hepcidin, and CPEB4 KO mice show increased tumor burden in diet-induced liver cancer models.\",\n      \"method\": \"CPEB4 KO and knockdown mice and cell lines, xenograft models, ferroptosis induction assays, iron/lipid peroxidation measurements\",\n      \"journal\": \"JHEP reports : innovation in hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO validation, cellular mechanistic assays for ferroptosis pathway, hepcidin as translational target implied but poly(A) assay not explicitly described in abstract\",\n      \"pmids\": [\"39980747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CPEB4 promotes cytoplasmic polyadenylation and stabilizes SCN5A mRNA, thereby supporting Nav1.5 protein expression and sodium current in cardiomyocytes. Cpeb4 deficiency in mice causes QRS widening, reduced Nav1.5 protein, and decreased sodium current. Restoring Cpeb4 after infarction preserved SCN5A/Nav1.5 and sodium current.\",\n      \"method\": \"Cpeb4-deficient mice, cardiac electrophysiology (ECG, patch clamp), sodium current measurements, in vivo infarction model with Cpeb4 restoration\",\n      \"journal\": \"JACC. Basic to translational science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct electrophysiological readout, specific mRNA target (SCN5A) identified, rescue experiment restoring Cpeb4, in vivo model\",\n      \"pmids\": [\"41846068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In shock-sensitive rats suppressing methamphetamine self-administration, CPEB4 mRNA levels are increased along with elevated protein levels of its interacting partners CPSF and GLD2. GLD2-regulated GLUN2A mRNA and protein are also increased, suggesting a CPEB4/GLD2 polyadenylation complex regulates NMDA receptor subunit expression in the dorsal striatum.\",\n      \"method\": \"Differential gene expression analysis, Western blot for CPSF and GLD2 protein levels, mRNA/protein quantification in dorsal striatum\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, correlation-based identification of CPEB4-CPSF-GLD2 complex without direct binding confirmation, no pull-down or Co-IP described\",\n      \"pmids\": [\"40141377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"miR-92 and miR-26 bind conserved target sites in the 3'-UTRs of CPEB2, CPEB3, and CPEB4 at paralog positions, coordinately downregulating all three paralogs by reducing their mRNA levels. Mutagenesis of miRNA-binding sites in reporter constructs confirmed direct targeting.\",\n      \"method\": \"Luciferase reporter assays, miRNA binding site mutagenesis, miRNA overexpression and depletion, endogenous mRNA level measurement\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct mutagenesis of binding sites in reporters confirms mechanism, but only reporter level validated for CPEB4 specifically, not full functional consequence\",\n      \"pmids\": [\"20660482\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CPEB4 is a sequence-specific RNA-binding protein that regulates mRNA translation and stability by modulating cytoplasmic poly(A) tail length through binding to cytoplasmic polyadenylation elements (CPEs) in target mRNA 3'-UTRs; its activity is controlled by ERK2/Cdk1-mediated phosphorylation and by liquid-liquid phase separation of its intrinsically disordered N-terminal domain (a process regulated by a neuron-specific microexon that prevents irreversible aggregation), it shuttles between nucleus and cytoplasm in a CaMKII- and ER calcium-dependent manner, it interacts with eIF3 to repress translation and with GLD2/CPSF for polyadenylation, and it functions sequentially with CPEB1 in both meiotic and mitotic cell cycles, as well as in diverse physiological contexts including liver ER stress adaptation (via circadian/UPR dual control), inflammation resolution (opposing TTP-mediated mRNA decay via MAPK signaling), erythropoiesis, muscle stem cell mitochondrial homeostasis, cardiac sodium channel (SCN5A/Nav1.5) mRNA stability, and translational reprogramming in cancer, fibrosis, and neurological disease.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CPEB4 is a sequence-specific RNA-binding protein that controls mRNA translation and stability by binding cytoplasmic polyadenylation elements (CPEs) in target 3'-UTRs and modulating cytoplasmic poly(A) tail length, with binding specificity distinct from CPEB1 and mediated by its tandem RRM domains [#0, #6]. Depending on context it either activates translation by directing cytoplasmic polyadenylation—of targets such as tPA, VEGF, MITF/RAB7A, PFKFB3, c-Fos, IL-22, and SCN5A [#4, #8, #10, #15, #13, #23, #31]—or represses translation, including through interaction with the eIF3 initiation complex during terminal erythropoiesis [#5]. CPEB4 functions sequentially and non-redundantly with CPEB1 across the meiotic and mitotic cell cycles: CPEB1 polyadenylates CPEB4 mRNA to activate it, after which CPEB4 takes over to drive M-phase and anaphase/cytokinesis transitions via spindle-associated CPE mRNAs [#1, #2, #18]. Its activity is gated by ERK2/Cdk1 hyperphosphorylation, which maintains the active monomeric state, whereas the unphosphorylated intrinsically disordered N-terminal domain undergoes liquid-liquid phase separation into inactive condensates [#9]; in neurons, a 24-bp microexon encodes histidine-cluster heterotypic interactions that keep these condensates reversible and prevent the irreversible aggregation seen when the microexon is lost in autism spectrum disorder and schizophrenia brains [#28, #14, #25]. CPEB4 shuttles between nucleus and cytoplasm under calcium- and CaMKII-dependent control linked to ER calcium and the IP3 receptor [#3]. Through these mechanisms CPEB4 coordinates stress-adaptive translational reprogramming in liver ER-stress/UPR and circadian control [#12, #27], inflammation resolution by opposing TTP-mediated mRNA decay [#22], and disease-relevant programs in cancer, fibrosis, and cardiac sodium-channel homeostasis [#4, #15, #31].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that CPEB4 is a distinct RNA-binding protein with sequence specificity different from CPEB1, answering whether the CPEB paralogs are functionally redundant.\",\n      \"evidence\": \"SELEX, RNA structure probing and footprinting comparing CPEB1, CPEB3, and CPEB4 binding\",\n      \"pmids\": [\"17024188\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define in vivo target mRNAs\", \"Structural basis of specificity not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed CPEB4 acts sequentially after CPEB1 in both meiosis and mitosis, resolving how successive cell-cycle transitions are coupled to phase-specific poly(A) changes.\",\n      \"evidence\": \"siRNA/KO with poly(A) tail and cell-cycle assays in mitotic cells, and Xenopus oocyte meiotic progression with kinase-inhibitor and reporter assays\",\n      \"pmids\": [\"20364142\", \"20531391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinases distinguishing CPEB1 vs CPEB4 timing not fully defined here\", \"Full target mRNA set per phase not enumerated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified calcium/CaMKII- and ER-calcium-dependent nucleocytoplasmic shuttling and a role in cell survival, answering how CPEB4 localization is signal-regulated.\",\n      \"evidence\": \"Subcellular fractionation, live imaging, CaMKII and IP3R manipulation, in vivo focal ischemia and oxygen-glucose deprivation\",\n      \"pmids\": [\"20937770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear function of CPEB4 not defined\", \"Export machinery beyond NES not identified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the structural basis of CPE recognition, showing both tandem RRMs are required and how they engage RNA.\",\n      \"evidence\": \"NMR, ITC, EMSA, and ion mobility-mass spectrometry of RRM1-RRM2\",\n      \"pmids\": [\"25081215\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address the N-terminal IDR contribution\", \"Affinity differences among physiological targets not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed a repressive mode via eIF3 and an autoregulatory negative feedback loop essential for terminal erythropoiesis, broadening CPEB4 beyond polyadenylation-driven activation.\",\n      \"evidence\": \"Co-IP of eIF3, ribosome profiling, siRNA, and primary erythroid differentiation downstream of Gata1/Tal1\",\n      \"pmids\": [\"25220394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch between repressive and activating modes not mechanistically defined\", \"eIF3 subunit contact points unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated that ERK2/Cdk1 phosphorylation controls a phase-separation switch governing CPEB4 activity and coordinates it with CPEB1 inactivation.\",\n      \"evidence\": \"In vitro kinase assays, phosphomutants, droplet microscopy, cell-cycle synchronization, biophysical assays\",\n      \"pmids\": [\"27802129\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo condensate dynamics during division not directly imaged\", \"Phosphatase reversing this state not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked CPEB4-driven cytoplasmic polyadenylation to oncogenic translational reprogramming in solid tumors, showing pathological reactivation of silenced mRNAs.\",\n      \"evidence\": \"RNA-IP, poly(A) assays, siRNA, luciferase reporters, and xenografts in pancreatic cancer and glioblastoma\",\n      \"pmids\": [\"22138752\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full oncogenic target network incomplete\", \"Upstream signal activating CPEB4 in tumors not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended CPEB4 cell-cycle and target control to melanoma drivers MITF/RAB7A, showing lineage-specific target repertoires.\",\n      \"evidence\": \"RIP-seq, poly(A) length tests, siRNA, cell-cycle analysis, clinical biopsy validation\",\n      \"pmids\": [\"27857118\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of lineage-specific target selection unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed CPEB1 nuclear processing of VEGF and CPEB4 mRNAs licenses CPEB4 to drive pathological angiogenesis, integrating nuclear and cytoplasmic regulation.\",\n      \"evidence\": \"siRNA, poly(A) assays, 3' RACE, tube formation, CPEB-deficient mice\",\n      \"pmids\": [\"26627607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of CPEB1-directed alternative processing not fully detailed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established CPEB4 as a UPR- and circadian-gated effector maintaining hepatic ER/mitochondrial homeostasis, defining a translational stress-adaptation circuit.\",\n      \"evidence\": \"Circadian analysis, uORF reporters, CPEB4 KO mice, ER-stress and high-fat-diet liver models\",\n      \"pmids\": [\"28092655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Second-wave UPR target mRNAs not enumerated\", \"uORF-sensing factor not identified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified c-Fos as a CPEB4 target in olfactory bulb granule cells, linking CPEB4 translational control to neuronal survival.\",\n      \"evidence\": \"CPEB4 KO mice, immunofluorescence, poly(A) assays, electrophysiology, behavior\",\n      \"pmids\": [\"29166615\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal coupling olfactory experience to CPEB4 activity not detailed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected a neuron-specific CPEB4 microexon to autism by showing its loss reduces poly(A) length and protein output of ASD risk genes, providing a unifying regulatory hub.\",\n      \"evidence\": \"RNA-IP, poly(A)-tail sequencing, RT-PCR, microexon-imbalance mouse model with human brain validation\",\n      \"pmids\": [\"30111840\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which microexon loss alters activity left to later structural work\", \"Splicing regulator controlling microexon inclusion not identified here\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided the molecular explanation for the microexon, showing it encodes histidine-cluster heterotypic interactions that keep neuronal condensates reversible and prevent dominant-negative aggregation.\",\n      \"evidence\": \"Phase separation and depolarization-dependent dissolution assays, structural analysis of microexon-histidine interactions, ASD brain and mouse models\",\n      \"pmids\": [\"39633052\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo condensate dynamics in human neurons not directly observed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed CPEB4 drives PFKFB3-dependent glycolysis to activate hepatic stellate cells, defining a metabolic-translational axis in fibrosis.\",\n      \"evidence\": \"RNA-IP, poly(A) assays, siRNA, CPEB4 KO mice, bile-duct ligation\",\n      \"pmids\": [\"32169429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same axis operates in non-hepatic fibrosis untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established that CPEB4 stabilizes anti-inflammatory CPE/ARE mRNAs by opposing TTP deadenylation under MAPK control, defining its role in inflammation resolution.\",\n      \"evidence\": \"siRNA, poly(A) assays, LPS stimulation, MAPK inhibition, in vivo sepsis model\",\n      \"pmids\": [\"35442882\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct competition vs TTP at shared 3'-UTRs not biochemically reconstituted\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified CPEB4 as a translational regulator of cardiac growth, repressing Zeb1/Zbtb20 to restrain pathological hypertrophy.\",\n      \"evidence\": \"RNA interactome capture, RNA-IP, siRNA, in vitro and in vivo hypertrophy models\",\n      \"pmids\": [\"33979607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Repressive vs activating mode at these targets not mechanistically separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed CPEB4 promotes diet-induced obesity by activating translation of inflammatory/metabolic mRNAs (Cebpb, Stat5a, Ccl2, Tlr4) in adipocytes.\",\n      \"evidence\": \"RIP-seq, CPEB4 KO mice, high-fat diet, siRNA\",\n      \"pmids\": [\"34774811\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal activating CPEB4 in obese adipocytes not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated CPEB4 stabilizes SCN5A mRNA to sustain Nav1.5 sodium current, with restoration rescuing post-infarction conduction defects.\",\n      \"evidence\": \"Cpeb4-deficient mice, ECG, patch clamp, sodium-current measurement, infarction-restoration model\",\n      \"pmids\": [\"41846068\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether stabilization is purely poly(A)-mediated not fully isolated\", \"Other cardiac ion-channel targets not surveyed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a nuclear splicing-regulatory role, with CPEB4 interacting with SRSF5/SRSF6 in nuclear bodies via its RNA-binding (RRM7) capacity to regulate Id2 splicing.\",\n      \"evidence\": \"Co-IP, immunofluorescence, domain-deletion mutants, RNA-seq, leptomycin B export inhibition during osteoclast differentiation\",\n      \"pmids\": [\"38284484\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab; direct CPEB4 binding to spliced pre-mRNA not shown\", \"Generality beyond osteoclasts untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CPEB4 switches between translational activation and repression on a given target, and how its phosphorylation/phase-separation state, nuclear splicing role, and shuttling are integrated in vivo, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of activator-vs-repressor mode selection\", \"Nuclear functions (splicing, shuttling purpose) mechanistically incomplete\", \"Phosphatase and condensate-resolution machinery in non-neuronal cells unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 4, 6, 10, 14, 17]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [1, 2, 4, 8, 15]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [5, 13, 22, 23]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [5, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 7, 9]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 16, 29]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 4, 8, 15, 22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 9, 13]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 2, 9, 18]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [3, 12, 24]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [22, 23, 24]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CPEB1\", \"eIF3\", \"GLD2\", \"CPSF\", \"TRIM25\", \"SRSF5\", \"SRSF6\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}