{"gene":"CELF1","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2006,"finding":"CUG-BP1/CELF1 binds specifically to ARE-containing mRNAs (c-fos, TNFα) and stimulates poly(A) shortening by directly recruiting PARN deadenylase; the CELF1–PARN interaction was demonstrated by co-immunoprecipitation from extracts and reconstituted with recombinant proteins.","method":"In vitro deadenylation assay, co-immunoprecipitation, recombinant protein pulldown","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with recombinant proteins, co-IP from extracts, and functional deadenylation assay; multiple orthogonal methods in one study","pmids":["16601207"],"is_preprint":false},{"year":2003,"finding":"Human CUG-BP/CELF1 functions as a deadenylation factor in a cell-free deadenylation assay; a mutant form retaining RNA-binding activity but lacking deadenylation function was identified, distinguishing RNA binding from deadenylation activity.","method":"In vitro deadenylation assay, RNA-binding assay, mutant analysis","journal":"Biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — functional in vitro assay with mutant dissection, single lab but two orthogonal approaches (binding vs. activity)","pmids":["12799066"],"is_preprint":false},{"year":2006,"finding":"High-affinity CELF1 binding requires UGU-rich sequences of at least 30 nucleotides containing ≥4 UGU trinucleotide motifs; high-affinity binding (but not low-affinity binding) confers deadenylation activity on a reporter mRNA in vivo.","method":"SELEX, surface plasmon resonance, EMSA, in vivo deadenylation reporter assay","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biochemical methods (SPR, EMSA, SELEX) plus functional in vivo assay, single lab","pmids":["16938098"],"is_preprint":false},{"year":2013,"finding":"Structural analysis by NMR and ITC shows all three RRMs of CELF1 simultaneously engage a 15-nt GU-rich element (5'-UGUNxUGUNyUGU); the three RRMs adopt a non-sequential 2-1-3 arrangement on RNA; CELF1 can also bind dispersed single-stranded UGU sites at the base of an RNA hairpin, explaining recognition of CUG-repeat expansions.","method":"NMR (paramagnetic relaxation enhancement), ITC, gel retardation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural study with ITC affinity measurements, multiple orthogonal biophysical methods, single lab","pmids":["23748565"],"is_preprint":false},{"year":2011,"finding":"NMR titration and ITC show that RRM1 binds both UGU and CUG repeats promiscuously, while RRM2 selects UGUU over CUG; cooperative high-affinity binding (Kd ~0.4 µM) by tandem RRM1+RRM2 requires a 2–4 U spacer between UGU sites; longer spacers (≥5 U) reduce affinity 10-fold.","method":"NMR titration, ITC, gel filtration, gel retardation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biophysical methods (NMR, ITC, gel filtration), systematic RNA variant analysis, single lab","pmids":["21743084"],"is_preprint":false},{"year":2007,"finding":"CELF1 localizes to stress granules (SGs) under environmental stress and shuttles between the nucleus and SGs; the linker domain between RRM2 and RRM3 is required for recruitment to both SGs and the perinucleolar compartment (PNC).","method":"Immunofluorescence, domain-deletion mutant analysis, live-cell imaging","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with domain mutants identifying the responsible region, single lab with two approaches","pmids":["18164289"],"is_preprint":false},{"year":2007,"finding":"CELF1 is co-transcriptionally recruited to nascent RNPs on lampbrush chromosome transcription units in amphibian oocytes; exogenous myc-tagged CUG-BP1 targets the same loci as endogenous CELF1 when expressed in microinjected oocytes.","method":"Immunostaining of lampbrush chromosome spreads, microinjection of tagged protein","journal":"Chromosome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct co-transcriptional localization with reciprocal antibody/tag confirmation, single lab","pmids":["18095176"],"is_preprint":false},{"year":2006,"finding":"CELF1 knockout in mice causes spermatogenesis arrest at step 7 of spermiogenesis (before spermatid elongation), increased apoptosis of germ cells, and growth retardation; CUG-BP1 is expressed in spermatogonia through round spermatids and in Sertoli and Leydig cells.","method":"Homologous recombination knockout, histology, RT-qPCR","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse model with defined cellular phenotype, replicated across males and females, multiple assays","pmids":["17130239"],"is_preprint":false},{"year":2015,"finding":"CELF1 directly binds the 3'-UTR of Myc mRNA and represses MYC translation without affecting total Myc mRNA levels; CELF1 and HuR compete for binding to the same Myc 3'-UTR element, with each protein antagonizing the other's association with the mRNA.","method":"RNA immunoprecipitation, translation reporter assay, RBP competition assay, siRNA knockdown, ectopic overexpression","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RIP confirmed binding, competition assays demonstrated mutual antagonism, translational repression confirmed with no mRNA level change; multiple orthogonal methods, single lab","pmids":["25808495"],"is_preprint":false},{"year":2017,"finding":"CELF1 mediates Cx43 (connexin 43) mRNA degradation by binding the UG-rich element in the Cx43 3'-UTR; nuclear localization of CELF1 is required for this activity; CELF1 interacts with the 3'→5' exoribonuclease RRP6 in an RNA-independent, nucleus-specific manner, and RRP6 knockdown abolishes CELF1-mediated Cx43 mRNA degradation.","method":"RNA immunoprecipitation, nuclear localization signal mutation, co-immunoprecipitation, siRNA knockdown","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RIP, NLS mutant, RNA-independent co-IP, and functional knockdown experiments; multiple orthogonal methods, single lab","pmids":["28874395"],"is_preprint":false},{"year":2017,"finding":"CELF1 binds GU-rich elements in the 3'-UTRs of pro-apoptotic mRNAs BAD, BAX, and JunD and mediates their rapid mRNA decay; silencing CELF1 stabilizes these mRNAs and increases their protein expression in oral cancer cells.","method":"RNA immunoprecipitation, 3'-UTR reporter assay, siRNA knockdown, mRNA half-life assay","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RIP and GRE reporter assay with functional mRNA stability readout; single lab, multiple targets tested","pmids":["23324604"],"is_preprint":false},{"year":2016,"finding":"CELF1 binds GU-rich cis-elements in the 3'-UTRs of EMT driver mRNAs and promotes their translation; CELF1 protein (but not mRNA) is post-translationally up-regulated during EMT; CELF1 is necessary and sufficient for mesenchymal transition and metastatic colonization.","method":"Polyribosomal profiling, 3'-UTR reporter assay, RNA immunoprecipitation, loss-of-function/gain-of-function experiments, metastasis assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — polyribosomal profiling, RIP, functional 3'-UTR reporters, and in vivo metastasis assays; multiple orthogonal methods, independent validation in clinical tissues","pmids":["27869122"],"is_preprint":false},{"year":2018,"finding":"Celf1 post-transcriptionally regulates p27Kip1 by binding its 5'-UTR and inhibiting translation, and maintains high Dnase2b mRNA levels by direct binding; together these control Cdk1-mediated lamin A/C phosphorylation to initiate nuclear envelope breakdown and DNA degradation in lens fiber cells. Celf1 also regulates alternative splicing of beta-spectrin and Actn2 mRNA levels to control fiber cell morphology.","method":"Conditional knockout mice, knockdown in zebrafish and Xenopus, RNA immunoprecipitation, 5'-UTR translation reporter assay","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multi-species loss-of-function (mouse, zebrafish, Xenopus), RIP, and reporter assays establishing distinct mechanistic roles","pmids":["29565969"],"is_preprint":false},{"year":2020,"finding":"Celf1 post-transcriptionally regulates Pax6 and Prox1 protein expression in lens development via their 3'-UTRs without affecting mRNA levels; Celf1 protein directly binds Pax6 and Prox1 transcripts as shown by RIP; reporter assays in Celf1 knockdown and overexpression cells confirm translational repression.","method":"Lens-conditional knockout mice, immunostaining, RT-qPCR, RNA immunoprecipitation, 3'-UTR reporter assay","journal":"Human genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RIP, reporter assay, and in vivo cKO with consistent protein-but-not-mRNA changes; multiple orthogonal methods, single lab","pmids":["32594240"],"is_preprint":false},{"year":2015,"finding":"CELF1 directly represses Cyp19a1 (aromatase) translation by binding its mRNA; CELF1 deficiency causes elevated aromatase, reduced testosterone, and spermiogenesis failure in mice; testosterone or aromatase inhibitor administration partially rescues the phenotype.","method":"Knockout mouse model, in vivo and in vitro CELF1-mRNA interaction assay, translation reporter assay, hormone rescue experiment","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue with testosterone/inhibitor, direct interaction assay, reporter assay, and in vivo phenotype; multiple methods, single lab","pmids":["26169831"],"is_preprint":false},{"year":2012,"finding":"Celf1 promotes dmrt2a mRNA decay in zebrafish by binding UGU repeats in its 3'-UTR; blocking the Celf1–dmrt2a mRNA interaction with a target protector morpholino rescues somite symmetry and left-right patterning defects caused by celf1 overexpression.","method":"Zebrafish overexpression/morpholino knockdown, RNA immunoprecipitation, target protector morpholino epistasis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct RIP and target protector rescue provide mechanistic specificity; overexpression and knockdown with epistasis, single lab","pmids":["22899848"],"is_preprint":false},{"year":2013,"finding":"In zebrafish, Celf1 binds gata5 and cdc42 mRNAs (involved in cell growth and migration) as shown by RIP; celf1 morpholino knockdown causes endoderm cell growth and migration defects leading to failure of liver bud formation and aberrant pancreas bud organization.","method":"Morpholino knockdown, RNA immunoprecipitation","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP established direct binding, morpholino phenotype consistent with targets; single lab, limited mechanistic follow-up","pmids":["24005864"],"is_preprint":false},{"year":2013,"finding":"In Xenopus somite segmentation, Celf1 targets rbpj mRNA for rapid degradation; derepression of rbpj in celf1 morphants stimulates Notch signaling, induces cyp26a overexpression, attenuates retinoic acid (RA) signaling, and represses fgf8—linking Celf1-mediated post-transcriptional repression to FGF–RA pathway coupling.","method":"Morpholino knockdown, epistasis, pharmacological pathway inhibition, RT-qPCR","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis experiments with pharmacological validation define pathway position; single lab, morpholino approach","pmids":["24167718"],"is_preprint":false},{"year":2015,"finding":"In Xenopus oogenesis, Celf1 is a component of vegetal RNA localization RNP complexes; it shows specific interactions with localization elements (LEs) from several vegetally localizing RNAs; overexpression of Celf1 or mutation of its LE binding sites interferes with vegetal RNA localization.","method":"RNA affinity purification, immunostaining, co-localization, morpholino/overexpression functional assays","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA affinity purification and functional perturbation establish complex membership and necessity; single lab","pmids":["26164657"],"is_preprint":false},{"year":2020,"finding":"Nuclear CELF1 activity, but not cytoplasmic CELF1 activity, is responsible for skeletal muscle wasting; transgenic mice expressing nuclear-restricted CELF1 show strong histopathological defects, muscle loss, and alternative splicing changes within 10 days, whereas cytoplasmic-restricted CELF1 causes translational target protein changes without histopathology.","method":"Doxycycline-inducible transgenic mice with compartment-restricted CELF1 mutants, RNA-sequencing, histopathology","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetically engineered compartment-specific mutants with defined muscle phenotype and transcriptome-wide readout; rigorous single-lab study with multiple orthogonal assays","pmids":["32412585"],"is_preprint":false},{"year":2016,"finding":"CELF1 directly binds GRE-containing 3'-UTRs of EMT driver mRNAs to translationally activate them; CELF1 protein (but not mRNA) is regulated post-translationally (by PKC-mediated phosphorylation) during EMT; CELF1 was identified as a novel regulator of the DEK oncogene in melanoma through RNA-immunoprecipitation and transcriptomic analyses.","method":"Genome-wide RNA-immunoprecipitation, proteomics, loss-of-function in cell lines, transcriptomic analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and systems-level multi-omics in single lab; mechanistic follow-up was partial for DEK specifically","pmids":["29269732"],"is_preprint":false},{"year":2024,"finding":"PKCα and PKCε phosphorylate CELF1 at multiple serine/threonine residues, increasing CELF1 stability and decreasing its ubiquitination; phosphomimetic CELF1 mutants are more stable and functional in EMT than phospho-null mutants; genetic epistasis places PKCα/ε upstream of CELF1 in the EMT program.","method":"Mass spectrometry of CELF1 phosphosites, co-immunoprecipitation, in vitro kinase assay, phosphomutant analysis, xenograft metastasis model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay, co-IP, phosphomutant structure-function analysis, and in vivo xenograft; multiple orthogonal methods in a single rigorous study","pmids":["39343007"],"is_preprint":false},{"year":2015,"finding":"CELF1 phosphorylation in malignant T cells prevents binding to GRE-containing mRNAs that serve as CELF1 targets in normal T cells, resulting in stabilization and up-regulation of these growth-promoting transcripts; lack of CELF1 binding correlates with loss of normal mRNA decay function.","method":"Anti-CELF1 immunoprecipitation with microarray of co-purified transcripts, phosphorylation analysis","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-array and phosphorylation correlation establish mechanistic link, single lab; two methods but correlational element limits tier","pmids":["26249002"],"is_preprint":false},{"year":2022,"finding":"CELF1 and ELAVL1 (HuR) directly interact in the nucleus (shown by FRET-FLIM) and cooperatively stimulate inclusion of CD44 variable exons v7–v10; depletion of either protein reduces exon inclusion.","method":"FRET-FLIM, RNAi depletion, exon array, RT-PCR","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — FRET-FLIM directly demonstrates nuclear protein–protein interaction, combined with functional splicing readout; multiple methods, single lab","pmids":["35973378"],"is_preprint":false},{"year":2021,"finding":"CELF1 directly binds PEBP1 mRNA 3'-UTR fragment 1 and negatively regulates PEBP1 protein (without affecting mRNA levels), activating the MAPK (Raf1/TAK1/ERK1/2/p38) signaling pathway to promote cardiac hypertrophy.","method":"RNA immunoprecipitation, biotin pull-down, dual-luciferase assay, siRNA/overexpression, ROS and apoptosis assays","journal":"Cell and tissue research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP, biotin pull-down, and reporter assay establish direct binding; translational regulation confirmed by protein-without-mRNA change; single lab","pmids":["34669021"],"is_preprint":false},{"year":2021,"finding":"CELF1 binds Vegfa mRNA via its 3'-UTR and promotes its decay; cardiomyocyte-specific CELF1 depletion in infarcted hearts preserves Vegfa mRNA levels and capillary density, linking CELF1-mediated mRNA destabilization to vascular rarefaction in DCM.","method":"RNA immunoprecipitation, 3'-UTR reporter assay, cardiomyocyte-specific CELF1 depletion, capillary density measurement","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and 3'-UTR reporter assay establish binding and function; cardiomyocyte-specific depletion provides in vivo mechanistic link; single lab","pmids":["33811692"],"is_preprint":false},{"year":2017,"finding":"CELF1 directly binds all six SRP subunit mRNAs in myoblasts (by CELF1 CLIP and in vitro binding with recombinant CELF1) and destabilizes at least five of the six Srp transcripts; CELF1 knockdown causes SRP protein imbalance, impairs secretion, and reduces myoblast wound-healing/migration.","method":"CLIP-seq, in vitro binding with recombinant CELF1, mRNA half-life assay, siRNA knockdown, secretion/migration assays","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — CLIP plus recombinant in vitro binding plus functional mRNA stability readout; multiple orthogonal methods, single lab","pmids":["28129347"],"is_preprint":false},{"year":2018,"finding":"CELF1 binds conserved GU-rich elements (GREs) in the HO-1 3'-UTR and destabilizes HO-1 mRNA; CO (a product of HO-1) in turn regulates CELF1 expression, forming a positive feedback circuit in cardiac myoblasts.","method":"RNA immunoprecipitation (RIP-seq), biotin pull-down, luciferase reporter, mRNA stability assay","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq, biotin pull-down, and luciferase reporter; single lab, functional feedback demonstrated biochemically","pmids":["30508596"],"is_preprint":false},{"year":2018,"finding":"CELF1 contributes to aberrant alternative splicing in the type 1 diabetic heart; disruption of CELF1 binding sites impairs CELF1-mediated alternative splicing regulation of relevant target genes.","method":"RNA-seq, genome-wide alternative splicing analysis, CELF1 binding site mutation","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide approach with binding site mutagenesis confirming functional requirement; single lab","pmids":["30158053"],"is_preprint":false},{"year":2016,"finding":"CELF1 knockdown in primary embryonic cardiomyocytes results in increased inclusion of a novel unannotated exon in MYH7B and decreased MYH7B protein levels; CLIP identified this exon as a direct CELF1 binding target in embryonic hearts.","method":"Cross-linking immunoprecipitation (CLIP), siRNA knockdown, RT-PCR, RNA-seq","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CLIP-established direct binding with functional splicing readout; single lab","pmids":["26866591"],"is_preprint":false},{"year":2016,"finding":"In Xenopus embryos and chicken cardiomyocytes, Celf1 knockdown causes myofibrillar disorganization, reduced proliferation, morphogenetic abnormalities, and impaired cardiac contraction without affecting heart rhythm; loss of Celf1 does not disrupt myofibril organization in skeletal muscle but does cause skeletal muscle bundle fragmentation.","method":"Morpholino knockdown (Xenopus), siRNA knockdown (chicken primary cardiomyocytes), optical coherence tomography, immunofluorescence","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two model systems with consistent cardiac phenotype; functional cardiac contraction measured by OCT; single lab","pmids":["27144987"],"is_preprint":false},{"year":2015,"finding":"Celf1 overexpression in myoblasts increases cell cycling and largely recapitulates CUG-expansion differentiation defects; knockdown of endogenous Celf1 leads to precocious myotube formation; Celf1 knockdown in CUG-expansion myocytes partially rescues the differentiation defect by promoting cell cycle exit.","method":"Overexpression, siRNA knockdown, cell cycle analysis, myocyte differentiation assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation (OE and KD) with cell cycle and differentiation readouts; single lab","pmids":["25887157"],"is_preprint":false},{"year":2014,"finding":"CELF1 target transcripts containing GREs in their 3'-UTRs undergo preferential 3'-end shortening by alternative polyadenylation (APA) following T cell activation, reducing inclusion of CELF1 binding sites and increasing transcript expression; CELF1 reversibly binding nearby GRE sequences can regulate APA site selection.","method":"Global RNA sequencing, APA analysis, CELF1 binding site mapping","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — global RNA-seq with mechanistic model of CELF1-mediated APA regulation; single lab; mechanistic model partially inferred","pmids":["25123787"],"is_preprint":false},{"year":2022,"finding":"Small molecule compound 27 directly binds CELF1 and competes with RNA for binding to CELF1, disrupting CELF1-RNA interaction; this inhibits CELF1-mediated IFN-γ mRNA decay in hepatic stellate cells and attenuates liver fibrosis in vivo; compound 841, a derivative, was identified as a selective CELF1 inhibitor.","method":"Virtual screening, biochemical binding assay, RNA competition assay, siRNA knockdown, mouse liver fibrosis model","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding and RNA competition biochemical assays plus in vivo efficacy; structure-activity relationship analysis; multiple methods in single study","pmids":["35234905"],"is_preprint":false},{"year":2024,"finding":"Thiopurine drugs (6-mercaptopurine, 6-thioguanine) disrupt CELF1-RNA interaction by forming disulfide bonds with cysteine residues proximal to CELF1's RNA recognition motifs; mutation of this cysteine or addition of reducing agents abolishes the disrupting activity.","method":"Biochemical CELF1-RNA disruption assay, site-directed mutagenesis, reducing agent controls, cell-based myogenesis assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis plus chemical rescue definitively establishes mechanism of cysteine-mediated RNA-binding disruption; multiple orthogonal validations","pmids":["39268573"],"is_preprint":false},{"year":2025,"finding":"CELF1 binds the 3'-UTR of Dio2 mRNA and enhances its stability, promoting local T3 production and thermogenic gene expression in beige adipocytes; adipocyte-specific Celf1 knockout impairs cold-induced thermogenesis and reduces energy expenditure.","method":"Adipocyte-specific knockout mice, RNA immunoprecipitation, mRNA stability assay, metabolic phenotyping","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific knockout with defined metabolic phenotype, RIP establishing direct binding, mRNA stability assay; multiple methods, single lab","pmids":["40789858"],"is_preprint":false},{"year":2018,"finding":"CELF1 promotes p53 protein translation (not mRNA level) in intestinal epithelial cells, as demonstrated by polysomal profiling and nascent protein analysis; ectopic CELF1 overexpression causes sustained G2 or G1 arrest in a p53-dependent manner, with p53 silencing abolishing the arrest.","method":"Polysomal profiling, nascent protein analysis, cell cycle assay, p53 siRNA epistasis, overexpression/knockdown","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — polysomal profiling and nascent protein synthesis directly demonstrate translational regulation; p53 epistasis confirms pathway placement; multiple orthogonal methods, single lab","pmids":["30514107"],"is_preprint":false},{"year":2024,"finding":"CELF1 directly binds KLC1 RNA (established by CLIP-seq database) and down-regulates KLC1 splice variant E (KLC1_vE) formation; depletion and overexpression experiments in cultured cells confirm that CELF1 protein reduces KLC1_vE levels, likely by modulating terminal exon usage.","method":"CLIP-seq (database), siRNA depletion, CELF1 overexpression, transcriptomic analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CLIP-seq evidence of direct binding plus bidirectional cell-based manipulation; partially reliant on public database for binding evidence","pmids":["38768546"],"is_preprint":false},{"year":2026,"finding":"CELF1 acts as a non-canonical eIF4E-binding protein; it directly binds both eIF4E and PABPC1 to promote eIF4G1-independent translation of GRE-containing EMT effector mRNAs in mesenchymal cells; disruption of the CELF1/eIF4E interaction inhibits EMT induction in vitro and experimental metastasis in vivo.","method":"Co-immunoprecipitation, in vitro binding, translation reporter assay, xenograft metastasis model","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct protein–protein interaction (co-IP and in vitro binding) plus functional translational and in vivo metastasis readouts; multiple orthogonal methods in one study","pmids":["41755641"],"is_preprint":false},{"year":2026,"finding":"iCLIP-seq in mouse lenses maps CELF1 binding primarily to 3'-UTRs of key lens transcripts (including Gja8, Jag1, Maf, Pax6, Prox1); integrated transcriptomic and luciferase reporter data show CELF1 represses target mRNAs by destabilizing transcripts and/or inhibiting translation; cataract-linked genes Maf and Gja8 are up-regulated in Celf1 cKO lenses; Maf overexpression in Xenopus causes abnormal lens structure.","method":"iCLIP-seq, conditional knockout transcriptomics, luciferase reporter assay, Xenopus overexpression","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — transcriptome-wide direct binding map by iCLIP, reporter assays, in vivo validation in Xenopus; multiple orthogonal methods; preprint","pmids":["41542625"],"is_preprint":true},{"year":2025,"finding":"CELF1 directly binds FMO2 mRNA 3'-UTR (via biotinylated GU-rich element pull-down and RIP) and promotes FMO2 mRNA decay; CELF1 silencing up-regulates FMO2 and improves post-myocardial infarction cardiac remodeling, while FMO2 overexpression reverses ECM deposition worsened by CELF1 activity.","method":"RNA immunoprecipitation, RNA pull-down (biotinylated 3'-UTR), actinomycin D mRNA stability assay, in vivo cardiac model","journal":"Cardiovascular toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and RNA pull-down establish direct binding; mRNA decay assay confirms functional outcome; single lab","pmids":["40021568"],"is_preprint":false},{"year":2020,"finding":"CELF1 regulates ETS2 mRNA stability by binding its 3'-UTR, as demonstrated by luciferase reporter and ribonucleoprotein immunoprecipitation assays; CELF1 overexpression increases CRC cell proliferation, migration, invasion, and resistance to oxaliplatin, and ETS2 knockdown reverses the drug resistance induced by CELF1 overexpression.","method":"Luciferase reporter assay, RIP, CELF1 overexpression/knockdown, xenograft model","journal":"Clinical science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and reporter assay with functional epistasis via ETS2 KD; single lab, multiple approaches","pmids":["32677671"],"is_preprint":false},{"year":2025,"finding":"tRF-24 binds CELF1 at Ser28, inhibiting AKT1-mediated phosphorylation at this site, which promotes CELF1 nuclear translocation and liquid-liquid phase separation (LLPS) formation; CELF1-enriched nuclear condensates regulate alternative splicing of BIN1 and BECN1 pre-mRNAs, generating pro-oncogenic isoforms.","method":"RNA pull-down, fluorescence recovery after photobleaching (FRAP), nuclear fractionation, phosphomutant analysis, RNA-seq/alternative splicing analysis","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRAP confirms phase separation, pull-down and phosphomutant establish binding and modification site; single lab, complex mechanistic claims from one study","pmids":["41250205"],"is_preprint":false}],"current_model":"CELF1 is a multifunctional RNA-binding protein that recognizes UGU/GU-rich elements through its three RRMs (with a defined 2-1-3 non-sequential binding arrangement and ~100 nM affinity) to regulate mRNA deadenylation (by recruiting PARN), mRNA decay (by recruiting RRP6 or destabilizing transcripts via the exosome), translational repression or activation of target mRNAs in the cytoplasm, and pre-mRNA alternative splicing in the nucleus; its activity is spatially segregated—nuclear CELF1 drives splicing and muscle wasting while cytoplasmic CELF1 governs translational targets—and is post-translationally controlled by PKCα/ε-mediated phosphorylation that stabilizes the protein, whereas phosphorylation in malignant cells impairs GRE-RNA binding; additionally, CELF1 acts as a non-canonical eIF4E/PABPC1 adaptor to promote cap-dependent but eIF4G1-independent translation of EMT driver mRNAs."},"narrative":{"mechanistic_narrative":"CELF1 (CUG-BP1) is a multifunctional RNA-binding protein that recognizes UGU/GU-rich elements (GREs) through three RRMs to control mRNA deadenylation, decay, translation, and pre-mRNA alternative splicing across development, muscle, and cancer [PMID:16601207, PMID:23748565, PMID:27869122]. High-affinity engagement requires UGU-rich stretches of ≥30 nt containing multiple UGU trinucleotides, with all three RRMs simultaneously contacting RNA in a non-sequential 2-1-3 arrangement; this binding mode also explains recognition of dispersed single-stranded UGU sites and CUG-repeat expansions [PMID:16938098, PMID:23748565, PMID:21743084]. CELF1 destabilizes target transcripts both by directly recruiting the PARN deadenylase to ARE-containing mRNAs and, in the nucleus, by interacting RNA-independently with the 3'→5' exoribonuclease RRP6 to drive degradation [PMID:16601207, PMID:28874395]. CELF1 also acts in translation: it represses targets such as MYC, Cyp19a1/aromatase, and lens regulators (Pax6, Prox1, p27Kip1) by binding their UTRs without changing mRNA levels, and it can translationally activate GRE-containing EMT-driver mRNAs by serving as a non-canonical eIF4E/PABPC1 adaptor that promotes cap-dependent, eIF4G1-independent translation [PMID:25808495, PMID:27869122, PMID:32594240, PMID:26169831, PMID:41755641]. CELF1 function is spatially partitioned—nuclear CELF1 drives alternative splicing and skeletal muscle wasting, whereas cytoplasmic CELF1 governs translational targets [PMID:32412585]. Activity is post-translationally tuned: PKCα/ε phosphorylation stabilizes CELF1 and is required for its pro-EMT function, while phosphorylation in malignant cells impairs GRE-RNA binding and derepresses growth-promoting transcripts [PMID:39343007, PMID:26249002]. Through these activities CELF1 governs spermiogenesis, lens fiber differentiation, somite and cardiac patterning, thermogenic metabolism, and tumor progression [PMID:17130239, PMID:29565969, PMID:22899848, PMID:27144987, PMID:40789858].","teleology":[{"year":2003,"claim":"Established that CELF1 acts as a deadenylation factor and that its RNA-binding activity is separable from its deadenylation-promoting activity, defining a functional dissection of the protein.","evidence":"Cell-free deadenylation assay with RNA-binding-competent, deadenylation-deficient mutant","pmids":["12799066"],"confidence":"High","gaps":["Did not identify the deadenylase recruited","No defined target sequence requirement"]},{"year":2006,"claim":"Resolved the deadenylation mechanism by showing CELF1 directly recruits the PARN deadenylase to ARE-containing mRNAs, and defined the UGU-rich element requirements that confer functional decay.","evidence":"In vitro deadenylation, co-IP and recombinant reconstitution of CELF1–PARN; SELEX/SPR/EMSA plus in vivo reporter","pmids":["16601207","16938098"],"confidence":"High","gaps":["Whether PARN is the sole effector deadenylase","How element length/motif number is read structurally"]},{"year":2007,"claim":"Defined CELF1 subcellular dynamics, showing nucleus-to-stress-granule shuttling and co-transcriptional recruitment to nascent RNPs, with the RRM2–RRM3 linker mediating granule/PNC targeting.","evidence":"Immunofluorescence, domain-deletion mutants, lampbrush chromosome immunostaining with tag confirmation","pmids":["18164289","18095176"],"confidence":"Medium","gaps":["Signals governing nucleocytoplasmic partitioning not defined","Functional consequence of co-transcriptional loading unresolved"]},{"year":2011,"claim":"Provided biophysical rules for RNA recognition, showing tandem RRM1+RRM2 bind cooperatively with U-spacer-dependent affinity and distinguishing UGU/CUG selectivity between the two RRMs.","evidence":"NMR titration, ITC, gel filtration, gel retardation of RNA variants","pmids":["21743084"],"confidence":"High","gaps":["RRM3 contribution addressed only in later work","Affinity in cellular context not measured"]},{"year":2013,"claim":"Determined that all three RRMs simultaneously engage a GU-rich element in a non-sequential 2-1-3 arrangement, providing the structural basis for recognition of both spaced motifs and CUG-repeat hairpins.","evidence":"NMR with paramagnetic relaxation enhancement, ITC, gel retardation","pmids":["23748565"],"confidence":"High","gaps":["No full-length CELF1–RNA structure","How structure couples to effector recruitment unknown"]},{"year":2006,"claim":"Established an essential developmental role in vivo, showing CELF1 loss arrests spermiogenesis and increases germ cell apoptosis.","evidence":"Constitutive knockout mouse with histology and expression mapping","pmids":["17130239"],"confidence":"High","gaps":["Direct mRNA targets not identified in this study","Cell-autonomy across germ/Sertoli/Leydig cells unresolved"]},{"year":2012,"claim":"Demonstrated target-specific developmental decay in vivo, with CELF1 driving dmrt2a mRNA degradation to control left-right and somite patterning.","evidence":"Zebrafish RIP plus target-protector morpholino epistasis rescue","pmids":["22899848"],"confidence":"High","gaps":["Decay machinery recruited for dmrt2a not defined"]},{"year":2013,"claim":"Extended CELF1 to embryonic patterning networks, linking its mRNA repression of rbpj to Notch/FGF/RA coupling and showing roles in endoderm migration via gata5/cdc42.","evidence":"Xenopus and zebrafish morpholino knockdown, RIP, pharmacological epistasis","pmids":["24167718","24005864"],"confidence":"Medium","gaps":["Decay vs translational mechanism not always distinguished","Morpholino-based; limited rescue"]},{"year":2015,"claim":"Established CELF1 as a direct translational repressor in vivo, repressing aromatase (Cyp19a1) to maintain testosterone for spermiogenesis, and MYC via 3'-UTR competition with HuR.","evidence":"Knockout mouse with hormone rescue; RIP, translation reporters, RBP competition assays","pmids":["26169831","25808495"],"confidence":"High","gaps":["Mechanism of translational block (initiation vs elongation) not defined for these targets"]},{"year":2016,"claim":"Identified CELF1 as a post-translationally upregulated, GRE-dependent translational activator of EMT-driver mRNAs that is necessary and sufficient for mesenchymal transition and metastasis.","evidence":"Polyribosomal profiling, RIP, 3'-UTR reporters, in vivo metastasis assays, clinical tissue validation","pmids":["27869122","29269732"],"confidence":"High","gaps":["How a GRE-binder switches from repression to activation not yet mechanistically defined here"]},{"year":2017,"claim":"Revealed a nuclear decay route in which CELF1 recruits the exosome exoribonuclease RRP6 RNA-independently to degrade Cx43 mRNA, and documented GRE-driven decay of pro-apoptotic and secretory transcripts.","evidence":"RIP, NLS mutant, RNA-independent co-IP, knockdown; CLIP and recombinant binding for SRP mRNAs","pmids":["28874395","23324604","28129347"],"confidence":"High","gaps":["What determines PARN- vs RRP6-mediated decay of a given target unknown","Compartment switch logic incomplete"]},{"year":2018,"claim":"Defined distinct mechanistic modes in lens and intestinal cells—translational repression (p27Kip1, p53), transcript stabilization (Dnase2b), and splicing control (beta-spectrin)—linking CELF1 to differentiation and cell-cycle outcomes.","evidence":"Conditional knockout mice, multi-species knockdown, RIP, 5'-UTR/UTR reporters, polysomal profiling, p53 epistasis","pmids":["29565969","30514107"],"confidence":"High","gaps":["How CELF1 can both stabilize and destabilize different targets in the same cell unresolved"]},{"year":2020,"claim":"Demonstrated functional compartmentalization: nuclear CELF1 drives splicing changes and muscle wasting, whereas cytoplasmic CELF1 alters translational targets without histopathology.","evidence":"Doxycycline-inducible compartment-restricted CELF1 transgenic mice, RNA-seq, histopathology; also lens 3'-UTR translational repression of Pax6/Prox1","pmids":["32412585","32594240"],"confidence":"High","gaps":["Splicing targets driving muscle wasting not fully enumerated","Determinants of CELF1 localization not defined"]},{"year":2021,"claim":"Expanded CELF1's pathophysiological reach in cardiovascular disease, showing direct UTR binding that destabilizes Vegfa, FMO2, and HO-1 mRNAs and represses PEBP1 translation to modulate hypertrophy, fibrosis, and vascular density.","evidence":"RIP, biotin pull-down, 3'-UTR reporters, mRNA stability assays, cardiomyocyte-specific depletion","pmids":["33811692","34669021","30508596","40021568"],"confidence":"Medium","gaps":["Largely single-lab per target","Decay machinery for cardiac targets not defined"]},{"year":2022,"claim":"Established a cooperative nuclear splicing partnership with HuR (ELAVL1) and provided the first selective small-molecule strategy to disrupt CELF1–RNA binding therapeutically.","evidence":"FRET-FLIM nuclear interaction, RNAi, exon array; virtual screening, RNA-competition binding assay, in vivo fibrosis model","pmids":["35973378","35234905"],"confidence":"High","gaps":["Structural basis of inhibitor binding not solved","How CELF1/HuR cooperate vs antagonize across targets unclear"]},{"year":2024,"claim":"Defined the principal post-translational control of CELF1 stability and a covalent drug mechanism: PKCα/ε phosphorylation stabilizes CELF1 by reducing ubiquitination, and thiopurines covalently modify RRM-proximal cysteines to block RNA binding.","evidence":"MS phosphosite mapping, in vitro kinase assays, phosphomutant/xenograft analysis; biochemical disruption assay with cysteine mutagenesis and reducing-agent rescue","pmids":["39343007","39268573"],"confidence":"High","gaps":["E3 ligase controlling CELF1 ubiquitination not identified","Phosphorylation-driven RNA-binding inhibition in malignancy mechanistically distinct and only correlational (idx 22)"]},{"year":2026,"claim":"Identified a non-canonical translation-initiation mechanism, with CELF1 binding eIF4E and PABPC1 to drive eIF4G1-independent cap-dependent translation of GRE-containing EMT effectors, explaining its translational-activator role.","evidence":"Co-IP, in vitro binding, translation reporters, xenograft metastasis model","pmids":["41755641"],"confidence":"High","gaps":["How the same GRE-binder selects activation vs repression contexts unresolved","Structure of the CELF1–eIF4E–PABPC1 complex unknown"]},{"year":2025,"claim":"Connected CELF1 to metabolism and to phase-separation-based splicing control, stabilizing Dio2 mRNA for thermogenesis and forming nuclear condensates (regulated by tRF-24/AKT1 at Ser28) that direct pro-oncogenic BIN1/BECN1 splicing.","evidence":"Adipocyte-specific knockout with metabolic phenotyping and RIP; FRAP, nuclear fractionation, phosphomutant analysis, splicing RNA-seq","pmids":["40789858","41250205"],"confidence":"Medium","gaps":["Phase-separation mechanism from single study","Link between condensate formation and splice-site selection mechanistically incomplete"]},{"year":null,"claim":"It remains unresolved what molecular logic determines whether CELF1 represses, activates, or splices a given GRE-containing target, and how phosphorylation, localization, and condensate formation are integrated to switch between these outcomes.","evidence":"No single study in the corpus reconciles the determinants of CELF1's opposing activities on a shared element","pmids":[],"confidence":"Low","gaps":["No unifying model for activation-vs-repression selection","Effector choice (PARN vs RRP6 vs eIF4E) not predictable from sequence","Full-length CELF1 structure on functional RNP absent"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,2,3,4,8,9,11,26,39]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0,1,9,26]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[8,11,13,14,36,38]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[19,23,28,29,42]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,9,38]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,19,23,42]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,11,19,38]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,2,9,11,19]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[19,23,28,29]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[8,11,14,36,38]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[7,12,15,30,39]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[20,21,41,42]}],"complexes":["stress granule","vegetal RNA localization RNP"],"partners":["PARN","RRP6","ELAVL1","EIF4E","PABPC1","PRKCA","PRKCE","AKT1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q92879","full_name":"CUGBP Elav-like family member 1","aliases":["50 kDa nuclear polyadenylated RNA-binding protein","Bruno-like protein 2","CUG triplet repeat RNA-binding protein 1","CUG-BP1","CUG-BP- and ETR-3-like factor 1","Deadenylation factor CUG-BP","Embryo deadenylation element-binding protein homolog","EDEN-BP homolog","RNA-binding protein BRUNOL-2"],"length_aa":486,"mass_kda":52.1,"function":"RNA-binding protein implicated in the regulation of several post-transcriptional events. Involved in pre-mRNA alternative splicing, mRNA translation and stability. Mediates exon inclusion and/or exclusion in pre-mRNA that are subject to tissue-specific and developmentally regulated alternative splicing. Specifically activates exon 5 inclusion of cardiac isoforms of TNNT2 during heart remodeling at the juvenile to adult transition. Acts both as an activator and as a repressor of a pair of coregulated exons: promotes inclusion of the smooth muscle (SM) exon but exclusion of the non-muscle (NM) exon in actinin pre-mRNAs. Activates SM exon 5 inclusion by antagonizing the repressive effect of PTB. Promotes exclusion of exon 11 of the INSR pre-mRNA. Inhibits, together with HNRNPH1, insulin receptor (IR) pre-mRNA exon 11 inclusion in myoblast. Increases translation and controls the choice of translation initiation codon of CEBPB mRNA. Increases mRNA translation of CEBPB in aging liver (By similarity). Increases translation of CDKN1A mRNA by antagonizing the repressive effect of CALR3. Mediates rapid cytoplasmic mRNA deadenylation. Recruits the deadenylase PARN to the poly(A) tail of EDEN-containing mRNAs to promote their deadenylation. Required for completion of spermatogenesis (By similarity). Binds to (CUG)n triplet repeats in the 3'-UTR of transcripts such as DMPK and to Bruno response elements (BREs). Binds to muscle-specific splicing enhancer (MSE) intronic sites flanking the alternative exon 5 of TNNT2 pre-mRNA. Binds to AU-rich sequences (AREs or EDEN-like) localized in the 3'-UTR of JUN and FOS mRNAs. Binds to the IR RNA. Binds to the 5'-region of CDKN1A and CEBPB mRNAs. Binds with the 5'-region of CEBPB mRNA in aging liver. May be a specific regulator of miRNA biogenesis. Binds to primary microRNA pri-MIR140 and, with CELF2, negatively regulates the processing to mature miRNA (PubMed:28431233)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q92879/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CELF1","classification":"Not Classified","n_dependent_lines":81,"n_total_lines":1208,"dependency_fraction":0.06705298013245033},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CELF1","total_profiled":1310},"omim":[{"mim_id":"616085","title":"ZINC FINGER PROTEIN 37A; ZNF37A","url":"https://www.omim.org/entry/616085"},{"mim_id":"601074","title":"CUGBP- AND ELAV-LIKE FAMILY, MEMBER 1; CELF1","url":"https://www.omim.org/entry/601074"},{"mim_id":"314670","title":"X INACTIVATION-SPECIFIC TRANSCRIPT; XIST","url":"https://www.omim.org/entry/314670"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CELF1"},"hgnc":{"alias_symbol":["CUG-BP","hNab50","BRUNOL2","NAB50","CUGBP","NAPOR","EDEN-BP"],"prev_symbol":["CUGBP1"]},"alphafold":{"accession":"Q92879","domains":[{"cath_id":"3.30.70.330","chopping":"15-96","consensus_level":"high","plddt":86.6401,"start":15,"end":96},{"cath_id":"3.30.70.330","chopping":"103-188","consensus_level":"high","plddt":85.7828,"start":103,"end":188},{"cath_id":"3.30.70.330","chopping":"401-475","consensus_level":"high","plddt":87.5561,"start":401,"end":475}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92879","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q92879-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q92879-F1-predicted_aligned_error_v6.png","plddt_mean":66.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CELF1","jax_strain_url":"https://www.jax.org/strain/search?query=CELF1"},"sequence":{"accession":"Q92879","fasta_url":"https://rest.uniprot.org/uniprotkb/Q92879.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q92879/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92879"}},"corpus_meta":[{"pmid":"22180311","id":"PMC_22180311","title":"The importance of CELF control: molecular and biological roles of the CUG-BP, Elav-like family of RNA-binding proteins.","date":"2011","source":"Wiley interdisciplinary reviews. 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the CELF1–PARN interaction was demonstrated by co-immunoprecipitation from extracts and reconstituted with recombinant proteins.\",\n      \"method\": \"In vitro deadenylation assay, co-immunoprecipitation, recombinant protein pulldown\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with recombinant proteins, co-IP from extracts, and functional deadenylation assay; multiple orthogonal methods in one study\",\n      \"pmids\": [\"16601207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human CUG-BP/CELF1 functions as a deadenylation factor in a cell-free deadenylation assay; a mutant form retaining RNA-binding activity but lacking deadenylation function was identified, distinguishing RNA binding from deadenylation activity.\",\n      \"method\": \"In vitro deadenylation assay, RNA-binding assay, mutant analysis\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — functional in vitro assay with mutant dissection, single lab but two orthogonal approaches (binding vs. activity)\",\n      \"pmids\": [\"12799066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"High-affinity CELF1 binding requires UGU-rich sequences of at least 30 nucleotides containing ≥4 UGU trinucleotide motifs; high-affinity binding (but not low-affinity binding) confers deadenylation activity on a reporter mRNA in vivo.\",\n      \"method\": \"SELEX, surface plasmon resonance, EMSA, in vivo deadenylation reporter assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biochemical methods (SPR, EMSA, SELEX) plus functional in vivo assay, single lab\",\n      \"pmids\": [\"16938098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Structural analysis by NMR and ITC shows all three RRMs of CELF1 simultaneously engage a 15-nt GU-rich element (5'-UGUNxUGUNyUGU); the three RRMs adopt a non-sequential 2-1-3 arrangement on RNA; CELF1 can also bind dispersed single-stranded UGU sites at the base of an RNA hairpin, explaining recognition of CUG-repeat expansions.\",\n      \"method\": \"NMR (paramagnetic relaxation enhancement), ITC, gel retardation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural study with ITC affinity measurements, multiple orthogonal biophysical methods, single lab\",\n      \"pmids\": [\"23748565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NMR titration and ITC show that RRM1 binds both UGU and CUG repeats promiscuously, while RRM2 selects UGUU over CUG; cooperative high-affinity binding (Kd ~0.4 µM) by tandem RRM1+RRM2 requires a 2–4 U spacer between UGU sites; longer spacers (≥5 U) reduce affinity 10-fold.\",\n      \"method\": \"NMR titration, ITC, gel filtration, gel retardation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biophysical methods (NMR, ITC, gel filtration), systematic RNA variant analysis, single lab\",\n      \"pmids\": [\"21743084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CELF1 localizes to stress granules (SGs) under environmental stress and shuttles between the nucleus and SGs; the linker domain between RRM2 and RRM3 is required for recruitment to both SGs and the perinucleolar compartment (PNC).\",\n      \"method\": \"Immunofluorescence, domain-deletion mutant analysis, live-cell imaging\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with domain mutants identifying the responsible region, single lab with two approaches\",\n      \"pmids\": [\"18164289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CELF1 is co-transcriptionally recruited to nascent RNPs on lampbrush chromosome transcription units in amphibian oocytes; exogenous myc-tagged CUG-BP1 targets the same loci as endogenous CELF1 when expressed in microinjected oocytes.\",\n      \"method\": \"Immunostaining of lampbrush chromosome spreads, microinjection of tagged protein\",\n      \"journal\": \"Chromosome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct co-transcriptional localization with reciprocal antibody/tag confirmation, single lab\",\n      \"pmids\": [\"18095176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CELF1 knockout in mice causes spermatogenesis arrest at step 7 of spermiogenesis (before spermatid elongation), increased apoptosis of germ cells, and growth retardation; CUG-BP1 is expressed in spermatogonia through round spermatids and in Sertoli and Leydig cells.\",\n      \"method\": \"Homologous recombination knockout, histology, RT-qPCR\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout mouse model with defined cellular phenotype, replicated across males and females, multiple assays\",\n      \"pmids\": [\"17130239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CELF1 directly binds the 3'-UTR of Myc mRNA and represses MYC translation without affecting total Myc mRNA levels; CELF1 and HuR compete for binding to the same Myc 3'-UTR element, with each protein antagonizing the other's association with the mRNA.\",\n      \"method\": \"RNA immunoprecipitation, translation reporter assay, RBP competition assay, siRNA knockdown, ectopic overexpression\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP confirmed binding, competition assays demonstrated mutual antagonism, translational repression confirmed with no mRNA level change; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"25808495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CELF1 mediates Cx43 (connexin 43) mRNA degradation by binding the UG-rich element in the Cx43 3'-UTR; nuclear localization of CELF1 is required for this activity; CELF1 interacts with the 3'→5' exoribonuclease RRP6 in an RNA-independent, nucleus-specific manner, and RRP6 knockdown abolishes CELF1-mediated Cx43 mRNA degradation.\",\n      \"method\": \"RNA immunoprecipitation, nuclear localization signal mutation, co-immunoprecipitation, siRNA knockdown\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP, NLS mutant, RNA-independent co-IP, and functional knockdown experiments; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"28874395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CELF1 binds GU-rich elements in the 3'-UTRs of pro-apoptotic mRNAs BAD, BAX, and JunD and mediates their rapid mRNA decay; silencing CELF1 stabilizes these mRNAs and increases their protein expression in oral cancer cells.\",\n      \"method\": \"RNA immunoprecipitation, 3'-UTR reporter assay, siRNA knockdown, mRNA half-life assay\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RIP and GRE reporter assay with functional mRNA stability readout; single lab, multiple targets tested\",\n      \"pmids\": [\"23324604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CELF1 binds GU-rich cis-elements in the 3'-UTRs of EMT driver mRNAs and promotes their translation; CELF1 protein (but not mRNA) is post-translationally up-regulated during EMT; CELF1 is necessary and sufficient for mesenchymal transition and metastatic colonization.\",\n      \"method\": \"Polyribosomal profiling, 3'-UTR reporter assay, RNA immunoprecipitation, loss-of-function/gain-of-function experiments, metastasis assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — polyribosomal profiling, RIP, functional 3'-UTR reporters, and in vivo metastasis assays; multiple orthogonal methods, independent validation in clinical tissues\",\n      \"pmids\": [\"27869122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Celf1 post-transcriptionally regulates p27Kip1 by binding its 5'-UTR and inhibiting translation, and maintains high Dnase2b mRNA levels by direct binding; together these control Cdk1-mediated lamin A/C phosphorylation to initiate nuclear envelope breakdown and DNA degradation in lens fiber cells. Celf1 also regulates alternative splicing of beta-spectrin and Actn2 mRNA levels to control fiber cell morphology.\",\n      \"method\": \"Conditional knockout mice, knockdown in zebrafish and Xenopus, RNA immunoprecipitation, 5'-UTR translation reporter assay\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multi-species loss-of-function (mouse, zebrafish, Xenopus), RIP, and reporter assays establishing distinct mechanistic roles\",\n      \"pmids\": [\"29565969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Celf1 post-transcriptionally regulates Pax6 and Prox1 protein expression in lens development via their 3'-UTRs without affecting mRNA levels; Celf1 protein directly binds Pax6 and Prox1 transcripts as shown by RIP; reporter assays in Celf1 knockdown and overexpression cells confirm translational repression.\",\n      \"method\": \"Lens-conditional knockout mice, immunostaining, RT-qPCR, RNA immunoprecipitation, 3'-UTR reporter assay\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP, reporter assay, and in vivo cKO with consistent protein-but-not-mRNA changes; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"32594240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CELF1 directly represses Cyp19a1 (aromatase) translation by binding its mRNA; CELF1 deficiency causes elevated aromatase, reduced testosterone, and spermiogenesis failure in mice; testosterone or aromatase inhibitor administration partially rescues the phenotype.\",\n      \"method\": \"Knockout mouse model, in vivo and in vitro CELF1-mRNA interaction assay, translation reporter assay, hormone rescue experiment\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue with testosterone/inhibitor, direct interaction assay, reporter assay, and in vivo phenotype; multiple methods, single lab\",\n      \"pmids\": [\"26169831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Celf1 promotes dmrt2a mRNA decay in zebrafish by binding UGU repeats in its 3'-UTR; blocking the Celf1–dmrt2a mRNA interaction with a target protector morpholino rescues somite symmetry and left-right patterning defects caused by celf1 overexpression.\",\n      \"method\": \"Zebrafish overexpression/morpholino knockdown, RNA immunoprecipitation, target protector morpholino epistasis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct RIP and target protector rescue provide mechanistic specificity; overexpression and knockdown with epistasis, single lab\",\n      \"pmids\": [\"22899848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In zebrafish, Celf1 binds gata5 and cdc42 mRNAs (involved in cell growth and migration) as shown by RIP; celf1 morpholino knockdown causes endoderm cell growth and migration defects leading to failure of liver bud formation and aberrant pancreas bud organization.\",\n      \"method\": \"Morpholino knockdown, RNA immunoprecipitation\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP established direct binding, morpholino phenotype consistent with targets; single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"24005864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In Xenopus somite segmentation, Celf1 targets rbpj mRNA for rapid degradation; derepression of rbpj in celf1 morphants stimulates Notch signaling, induces cyp26a overexpression, attenuates retinoic acid (RA) signaling, and represses fgf8—linking Celf1-mediated post-transcriptional repression to FGF–RA pathway coupling.\",\n      \"method\": \"Morpholino knockdown, epistasis, pharmacological pathway inhibition, RT-qPCR\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis experiments with pharmacological validation define pathway position; single lab, morpholino approach\",\n      \"pmids\": [\"24167718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In Xenopus oogenesis, Celf1 is a component of vegetal RNA localization RNP complexes; it shows specific interactions with localization elements (LEs) from several vegetally localizing RNAs; overexpression of Celf1 or mutation of its LE binding sites interferes with vegetal RNA localization.\",\n      \"method\": \"RNA affinity purification, immunostaining, co-localization, morpholino/overexpression functional assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA affinity purification and functional perturbation establish complex membership and necessity; single lab\",\n      \"pmids\": [\"26164657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Nuclear CELF1 activity, but not cytoplasmic CELF1 activity, is responsible for skeletal muscle wasting; transgenic mice expressing nuclear-restricted CELF1 show strong histopathological defects, muscle loss, and alternative splicing changes within 10 days, whereas cytoplasmic-restricted CELF1 causes translational target protein changes without histopathology.\",\n      \"method\": \"Doxycycline-inducible transgenic mice with compartment-restricted CELF1 mutants, RNA-sequencing, histopathology\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetically engineered compartment-specific mutants with defined muscle phenotype and transcriptome-wide readout; rigorous single-lab study with multiple orthogonal assays\",\n      \"pmids\": [\"32412585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CELF1 directly binds GRE-containing 3'-UTRs of EMT driver mRNAs to translationally activate them; CELF1 protein (but not mRNA) is regulated post-translationally (by PKC-mediated phosphorylation) during EMT; CELF1 was identified as a novel regulator of the DEK oncogene in melanoma through RNA-immunoprecipitation and transcriptomic analyses.\",\n      \"method\": \"Genome-wide RNA-immunoprecipitation, proteomics, loss-of-function in cell lines, transcriptomic analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and systems-level multi-omics in single lab; mechanistic follow-up was partial for DEK specifically\",\n      \"pmids\": [\"29269732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PKCα and PKCε phosphorylate CELF1 at multiple serine/threonine residues, increasing CELF1 stability and decreasing its ubiquitination; phosphomimetic CELF1 mutants are more stable and functional in EMT than phospho-null mutants; genetic epistasis places PKCα/ε upstream of CELF1 in the EMT program.\",\n      \"method\": \"Mass spectrometry of CELF1 phosphosites, co-immunoprecipitation, in vitro kinase assay, phosphomutant analysis, xenograft metastasis model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay, co-IP, phosphomutant structure-function analysis, and in vivo xenograft; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"39343007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CELF1 phosphorylation in malignant T cells prevents binding to GRE-containing mRNAs that serve as CELF1 targets in normal T cells, resulting in stabilization and up-regulation of these growth-promoting transcripts; lack of CELF1 binding correlates with loss of normal mRNA decay function.\",\n      \"method\": \"Anti-CELF1 immunoprecipitation with microarray of co-purified transcripts, phosphorylation analysis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-array and phosphorylation correlation establish mechanistic link, single lab; two methods but correlational element limits tier\",\n      \"pmids\": [\"26249002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CELF1 and ELAVL1 (HuR) directly interact in the nucleus (shown by FRET-FLIM) and cooperatively stimulate inclusion of CD44 variable exons v7–v10; depletion of either protein reduces exon inclusion.\",\n      \"method\": \"FRET-FLIM, RNAi depletion, exon array, RT-PCR\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — FRET-FLIM directly demonstrates nuclear protein–protein interaction, combined with functional splicing readout; multiple methods, single lab\",\n      \"pmids\": [\"35973378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CELF1 directly binds PEBP1 mRNA 3'-UTR fragment 1 and negatively regulates PEBP1 protein (without affecting mRNA levels), activating the MAPK (Raf1/TAK1/ERK1/2/p38) signaling pathway to promote cardiac hypertrophy.\",\n      \"method\": \"RNA immunoprecipitation, biotin pull-down, dual-luciferase assay, siRNA/overexpression, ROS and apoptosis assays\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP, biotin pull-down, and reporter assay establish direct binding; translational regulation confirmed by protein-without-mRNA change; single lab\",\n      \"pmids\": [\"34669021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CELF1 binds Vegfa mRNA via its 3'-UTR and promotes its decay; cardiomyocyte-specific CELF1 depletion in infarcted hearts preserves Vegfa mRNA levels and capillary density, linking CELF1-mediated mRNA destabilization to vascular rarefaction in DCM.\",\n      \"method\": \"RNA immunoprecipitation, 3'-UTR reporter assay, cardiomyocyte-specific CELF1 depletion, capillary density measurement\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and 3'-UTR reporter assay establish binding and function; cardiomyocyte-specific depletion provides in vivo mechanistic link; single lab\",\n      \"pmids\": [\"33811692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CELF1 directly binds all six SRP subunit mRNAs in myoblasts (by CELF1 CLIP and in vitro binding with recombinant CELF1) and destabilizes at least five of the six Srp transcripts; CELF1 knockdown causes SRP protein imbalance, impairs secretion, and reduces myoblast wound-healing/migration.\",\n      \"method\": \"CLIP-seq, in vitro binding with recombinant CELF1, mRNA half-life assay, siRNA knockdown, secretion/migration assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — CLIP plus recombinant in vitro binding plus functional mRNA stability readout; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"28129347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CELF1 binds conserved GU-rich elements (GREs) in the HO-1 3'-UTR and destabilizes HO-1 mRNA; CO (a product of HO-1) in turn regulates CELF1 expression, forming a positive feedback circuit in cardiac myoblasts.\",\n      \"method\": \"RNA immunoprecipitation (RIP-seq), biotin pull-down, luciferase reporter, mRNA stability assay\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq, biotin pull-down, and luciferase reporter; single lab, functional feedback demonstrated biochemically\",\n      \"pmids\": [\"30508596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CELF1 contributes to aberrant alternative splicing in the type 1 diabetic heart; disruption of CELF1 binding sites impairs CELF1-mediated alternative splicing regulation of relevant target genes.\",\n      \"method\": \"RNA-seq, genome-wide alternative splicing analysis, CELF1 binding site mutation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide approach with binding site mutagenesis confirming functional requirement; single lab\",\n      \"pmids\": [\"30158053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CELF1 knockdown in primary embryonic cardiomyocytes results in increased inclusion of a novel unannotated exon in MYH7B and decreased MYH7B protein levels; CLIP identified this exon as a direct CELF1 binding target in embryonic hearts.\",\n      \"method\": \"Cross-linking immunoprecipitation (CLIP), siRNA knockdown, RT-PCR, RNA-seq\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CLIP-established direct binding with functional splicing readout; single lab\",\n      \"pmids\": [\"26866591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In Xenopus embryos and chicken cardiomyocytes, Celf1 knockdown causes myofibrillar disorganization, reduced proliferation, morphogenetic abnormalities, and impaired cardiac contraction without affecting heart rhythm; loss of Celf1 does not disrupt myofibril organization in skeletal muscle but does cause skeletal muscle bundle fragmentation.\",\n      \"method\": \"Morpholino knockdown (Xenopus), siRNA knockdown (chicken primary cardiomyocytes), optical coherence tomography, immunofluorescence\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two model systems with consistent cardiac phenotype; functional cardiac contraction measured by OCT; single lab\",\n      \"pmids\": [\"27144987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Celf1 overexpression in myoblasts increases cell cycling and largely recapitulates CUG-expansion differentiation defects; knockdown of endogenous Celf1 leads to precocious myotube formation; Celf1 knockdown in CUG-expansion myocytes partially rescues the differentiation defect by promoting cell cycle exit.\",\n      \"method\": \"Overexpression, siRNA knockdown, cell cycle analysis, myocyte differentiation assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation (OE and KD) with cell cycle and differentiation readouts; single lab\",\n      \"pmids\": [\"25887157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CELF1 target transcripts containing GREs in their 3'-UTRs undergo preferential 3'-end shortening by alternative polyadenylation (APA) following T cell activation, reducing inclusion of CELF1 binding sites and increasing transcript expression; CELF1 reversibly binding nearby GRE sequences can regulate APA site selection.\",\n      \"method\": \"Global RNA sequencing, APA analysis, CELF1 binding site mapping\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — global RNA-seq with mechanistic model of CELF1-mediated APA regulation; single lab; mechanistic model partially inferred\",\n      \"pmids\": [\"25123787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Small molecule compound 27 directly binds CELF1 and competes with RNA for binding to CELF1, disrupting CELF1-RNA interaction; this inhibits CELF1-mediated IFN-γ mRNA decay in hepatic stellate cells and attenuates liver fibrosis in vivo; compound 841, a derivative, was identified as a selective CELF1 inhibitor.\",\n      \"method\": \"Virtual screening, biochemical binding assay, RNA competition assay, siRNA knockdown, mouse liver fibrosis model\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding and RNA competition biochemical assays plus in vivo efficacy; structure-activity relationship analysis; multiple methods in single study\",\n      \"pmids\": [\"35234905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Thiopurine drugs (6-mercaptopurine, 6-thioguanine) disrupt CELF1-RNA interaction by forming disulfide bonds with cysteine residues proximal to CELF1's RNA recognition motifs; mutation of this cysteine or addition of reducing agents abolishes the disrupting activity.\",\n      \"method\": \"Biochemical CELF1-RNA disruption assay, site-directed mutagenesis, reducing agent controls, cell-based myogenesis assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis plus chemical rescue definitively establishes mechanism of cysteine-mediated RNA-binding disruption; multiple orthogonal validations\",\n      \"pmids\": [\"39268573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CELF1 binds the 3'-UTR of Dio2 mRNA and enhances its stability, promoting local T3 production and thermogenic gene expression in beige adipocytes; adipocyte-specific Celf1 knockout impairs cold-induced thermogenesis and reduces energy expenditure.\",\n      \"method\": \"Adipocyte-specific knockout mice, RNA immunoprecipitation, mRNA stability assay, metabolic phenotyping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific knockout with defined metabolic phenotype, RIP establishing direct binding, mRNA stability assay; multiple methods, single lab\",\n      \"pmids\": [\"40789858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CELF1 promotes p53 protein translation (not mRNA level) in intestinal epithelial cells, as demonstrated by polysomal profiling and nascent protein analysis; ectopic CELF1 overexpression causes sustained G2 or G1 arrest in a p53-dependent manner, with p53 silencing abolishing the arrest.\",\n      \"method\": \"Polysomal profiling, nascent protein analysis, cell cycle assay, p53 siRNA epistasis, overexpression/knockdown\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — polysomal profiling and nascent protein synthesis directly demonstrate translational regulation; p53 epistasis confirms pathway placement; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"30514107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CELF1 directly binds KLC1 RNA (established by CLIP-seq database) and down-regulates KLC1 splice variant E (KLC1_vE) formation; depletion and overexpression experiments in cultured cells confirm that CELF1 protein reduces KLC1_vE levels, likely by modulating terminal exon usage.\",\n      \"method\": \"CLIP-seq (database), siRNA depletion, CELF1 overexpression, transcriptomic analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CLIP-seq evidence of direct binding plus bidirectional cell-based manipulation; partially reliant on public database for binding evidence\",\n      \"pmids\": [\"38768546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CELF1 acts as a non-canonical eIF4E-binding protein; it directly binds both eIF4E and PABPC1 to promote eIF4G1-independent translation of GRE-containing EMT effector mRNAs in mesenchymal cells; disruption of the CELF1/eIF4E interaction inhibits EMT induction in vitro and experimental metastasis in vivo.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding, translation reporter assay, xenograft metastasis model\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct protein–protein interaction (co-IP and in vitro binding) plus functional translational and in vivo metastasis readouts; multiple orthogonal methods in one study\",\n      \"pmids\": [\"41755641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"iCLIP-seq in mouse lenses maps CELF1 binding primarily to 3'-UTRs of key lens transcripts (including Gja8, Jag1, Maf, Pax6, Prox1); integrated transcriptomic and luciferase reporter data show CELF1 represses target mRNAs by destabilizing transcripts and/or inhibiting translation; cataract-linked genes Maf and Gja8 are up-regulated in Celf1 cKO lenses; Maf overexpression in Xenopus causes abnormal lens structure.\",\n      \"method\": \"iCLIP-seq, conditional knockout transcriptomics, luciferase reporter assay, Xenopus overexpression\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — transcriptome-wide direct binding map by iCLIP, reporter assays, in vivo validation in Xenopus; multiple orthogonal methods; preprint\",\n      \"pmids\": [\"41542625\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CELF1 directly binds FMO2 mRNA 3'-UTR (via biotinylated GU-rich element pull-down and RIP) and promotes FMO2 mRNA decay; CELF1 silencing up-regulates FMO2 and improves post-myocardial infarction cardiac remodeling, while FMO2 overexpression reverses ECM deposition worsened by CELF1 activity.\",\n      \"method\": \"RNA immunoprecipitation, RNA pull-down (biotinylated 3'-UTR), actinomycin D mRNA stability assay, in vivo cardiac model\",\n      \"journal\": \"Cardiovascular toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and RNA pull-down establish direct binding; mRNA decay assay confirms functional outcome; single lab\",\n      \"pmids\": [\"40021568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CELF1 regulates ETS2 mRNA stability by binding its 3'-UTR, as demonstrated by luciferase reporter and ribonucleoprotein immunoprecipitation assays; CELF1 overexpression increases CRC cell proliferation, migration, invasion, and resistance to oxaliplatin, and ETS2 knockdown reverses the drug resistance induced by CELF1 overexpression.\",\n      \"method\": \"Luciferase reporter assay, RIP, CELF1 overexpression/knockdown, xenograft model\",\n      \"journal\": \"Clinical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and reporter assay with functional epistasis via ETS2 KD; single lab, multiple approaches\",\n      \"pmids\": [\"32677671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"tRF-24 binds CELF1 at Ser28, inhibiting AKT1-mediated phosphorylation at this site, which promotes CELF1 nuclear translocation and liquid-liquid phase separation (LLPS) formation; CELF1-enriched nuclear condensates regulate alternative splicing of BIN1 and BECN1 pre-mRNAs, generating pro-oncogenic isoforms.\",\n      \"method\": \"RNA pull-down, fluorescence recovery after photobleaching (FRAP), nuclear fractionation, phosphomutant analysis, RNA-seq/alternative splicing analysis\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP confirms phase separation, pull-down and phosphomutant establish binding and modification site; single lab, complex mechanistic claims from one study\",\n      \"pmids\": [\"41250205\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CELF1 is a multifunctional RNA-binding protein that recognizes UGU/GU-rich elements through its three RRMs (with a defined 2-1-3 non-sequential binding arrangement and ~100 nM affinity) to regulate mRNA deadenylation (by recruiting PARN), mRNA decay (by recruiting RRP6 or destabilizing transcripts via the exosome), translational repression or activation of target mRNAs in the cytoplasm, and pre-mRNA alternative splicing in the nucleus; its activity is spatially segregated—nuclear CELF1 drives splicing and muscle wasting while cytoplasmic CELF1 governs translational targets—and is post-translationally controlled by PKCα/ε-mediated phosphorylation that stabilizes the protein, whereas phosphorylation in malignant cells impairs GRE-RNA binding; additionally, CELF1 acts as a non-canonical eIF4E/PABPC1 adaptor to promote cap-dependent but eIF4G1-independent translation of EMT driver mRNAs.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CELF1 (CUG-BP1) is a multifunctional RNA-binding protein that recognizes UGU/GU-rich elements (GREs) through three RRMs to control mRNA deadenylation, decay, translation, and pre-mRNA alternative splicing across development, muscle, and cancer [#0, #3, #11]. High-affinity engagement requires UGU-rich stretches of \\u226530 nt containing multiple UGU trinucleotides, with all three RRMs simultaneously contacting RNA in a non-sequential 2-1-3 arrangement; this binding mode also explains recognition of dispersed single-stranded UGU sites and CUG-repeat expansions [#2, #3, #4]. CELF1 destabilizes target transcripts both by directly recruiting the PARN deadenylase to ARE-containing mRNAs and, in the nucleus, by interacting RNA-independently with the 3'\\u21925' exoribonuclease RRP6 to drive degradation [#0, #9]. CELF1 also acts in translation: it represses targets such as MYC, Cyp19a1/aromatase, and lens regulators (Pax6, Prox1, p27Kip1) by binding their UTRs without changing mRNA levels, and it can translationally activate GRE-containing EMT-driver mRNAs by serving as a non-canonical eIF4E/PABPC1 adaptor that promotes cap-dependent, eIF4G1-independent translation [#8, #11, #13, #14, #38]. CELF1 function is spatially partitioned\\u2014nuclear CELF1 drives alternative splicing and skeletal muscle wasting, whereas cytoplasmic CELF1 governs translational targets [#19]. Activity is post-translationally tuned: PKC\\u03b1/\\u03b5 phosphorylation stabilizes CELF1 and is required for its pro-EMT function, while phosphorylation in malignant cells impairs GRE-RNA binding and derepresses growth-promoting transcripts [#21, #22]. Through these activities CELF1 governs spermiogenesis, lens fiber differentiation, somite and cardiac patterning, thermogenic metabolism, and tumor progression [#7, #12, #15, #30, #35].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established that CELF1 acts as a deadenylation factor and that its RNA-binding activity is separable from its deadenylation-promoting activity, defining a functional dissection of the protein.\",\n      \"evidence\": \"Cell-free deadenylation assay with RNA-binding-competent, deadenylation-deficient mutant\",\n      \"pmids\": [\"12799066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the deadenylase recruited\", \"No defined target sequence requirement\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved the deadenylation mechanism by showing CELF1 directly recruits the PARN deadenylase to ARE-containing mRNAs, and defined the UGU-rich element requirements that confer functional decay.\",\n      \"evidence\": \"In vitro deadenylation, co-IP and recombinant reconstitution of CELF1\\u2013PARN; SELEX/SPR/EMSA plus in vivo reporter\",\n      \"pmids\": [\"16601207\", \"16938098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PARN is the sole effector deadenylase\", \"How element length/motif number is read structurally\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined CELF1 subcellular dynamics, showing nucleus-to-stress-granule shuttling and co-transcriptional recruitment to nascent RNPs, with the RRM2\\u2013RRM3 linker mediating granule/PNC targeting.\",\n      \"evidence\": \"Immunofluorescence, domain-deletion mutants, lampbrush chromosome immunostaining with tag confirmation\",\n      \"pmids\": [\"18164289\", \"18095176\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signals governing nucleocytoplasmic partitioning not defined\", \"Functional consequence of co-transcriptional loading unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided biophysical rules for RNA recognition, showing tandem RRM1+RRM2 bind cooperatively with U-spacer-dependent affinity and distinguishing UGU/CUG selectivity between the two RRMs.\",\n      \"evidence\": \"NMR titration, ITC, gel filtration, gel retardation of RNA variants\",\n      \"pmids\": [\"21743084\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RRM3 contribution addressed only in later work\", \"Affinity in cellular context not measured\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Determined that all three RRMs simultaneously engage a GU-rich element in a non-sequential 2-1-3 arrangement, providing the structural basis for recognition of both spaced motifs and CUG-repeat hairpins.\",\n      \"evidence\": \"NMR with paramagnetic relaxation enhancement, ITC, gel retardation\",\n      \"pmids\": [\"23748565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length CELF1\\u2013RNA structure\", \"How structure couples to effector recruitment unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established an essential developmental role in vivo, showing CELF1 loss arrests spermiogenesis and increases germ cell apoptosis.\",\n      \"evidence\": \"Constitutive knockout mouse with histology and expression mapping\",\n      \"pmids\": [\"17130239\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mRNA targets not identified in this study\", \"Cell-autonomy across germ/Sertoli/Leydig cells unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated target-specific developmental decay in vivo, with CELF1 driving dmrt2a mRNA degradation to control left-right and somite patterning.\",\n      \"evidence\": \"Zebrafish RIP plus target-protector morpholino epistasis rescue\",\n      \"pmids\": [\"22899848\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Decay machinery recruited for dmrt2a not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended CELF1 to embryonic patterning networks, linking its mRNA repression of rbpj to Notch/FGF/RA coupling and showing roles in endoderm migration via gata5/cdc42.\",\n      \"evidence\": \"Xenopus and zebrafish morpholino knockdown, RIP, pharmacological epistasis\",\n      \"pmids\": [\"24167718\", \"24005864\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Decay vs translational mechanism not always distinguished\", \"Morpholino-based; limited rescue\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established CELF1 as a direct translational repressor in vivo, repressing aromatase (Cyp19a1) to maintain testosterone for spermiogenesis, and MYC via 3'-UTR competition with HuR.\",\n      \"evidence\": \"Knockout mouse with hormone rescue; RIP, translation reporters, RBP competition assays\",\n      \"pmids\": [\"26169831\", \"25808495\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of translational block (initiation vs elongation) not defined for these targets\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified CELF1 as a post-translationally upregulated, GRE-dependent translational activator of EMT-driver mRNAs that is necessary and sufficient for mesenchymal transition and metastasis.\",\n      \"evidence\": \"Polyribosomal profiling, RIP, 3'-UTR reporters, in vivo metastasis assays, clinical tissue validation\",\n      \"pmids\": [\"27869122\", \"29269732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a GRE-binder switches from repression to activation not yet mechanistically defined here\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed a nuclear decay route in which CELF1 recruits the exosome exoribonuclease RRP6 RNA-independently to degrade Cx43 mRNA, and documented GRE-driven decay of pro-apoptotic and secretory transcripts.\",\n      \"evidence\": \"RIP, NLS mutant, RNA-independent co-IP, knockdown; CLIP and recombinant binding for SRP mRNAs\",\n      \"pmids\": [\"28874395\", \"23324604\", \"28129347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"What determines PARN- vs RRP6-mediated decay of a given target unknown\", \"Compartment switch logic incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined distinct mechanistic modes in lens and intestinal cells\\u2014translational repression (p27Kip1, p53), transcript stabilization (Dnase2b), and splicing control (beta-spectrin)\\u2014linking CELF1 to differentiation and cell-cycle outcomes.\",\n      \"evidence\": \"Conditional knockout mice, multi-species knockdown, RIP, 5'-UTR/UTR reporters, polysomal profiling, p53 epistasis\",\n      \"pmids\": [\"29565969\", \"30514107\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CELF1 can both stabilize and destabilize different targets in the same cell unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated functional compartmentalization: nuclear CELF1 drives splicing changes and muscle wasting, whereas cytoplasmic CELF1 alters translational targets without histopathology.\",\n      \"evidence\": \"Doxycycline-inducible compartment-restricted CELF1 transgenic mice, RNA-seq, histopathology; also lens 3'-UTR translational repression of Pax6/Prox1\",\n      \"pmids\": [\"32412585\", \"32594240\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Splicing targets driving muscle wasting not fully enumerated\", \"Determinants of CELF1 localization not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Expanded CELF1's pathophysiological reach in cardiovascular disease, showing direct UTR binding that destabilizes Vegfa, FMO2, and HO-1 mRNAs and represses PEBP1 translation to modulate hypertrophy, fibrosis, and vascular density.\",\n      \"evidence\": \"RIP, biotin pull-down, 3'-UTR reporters, mRNA stability assays, cardiomyocyte-specific depletion\",\n      \"pmids\": [\"33811692\", \"34669021\", \"30508596\", \"40021568\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Largely single-lab per target\", \"Decay machinery for cardiac targets not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established a cooperative nuclear splicing partnership with HuR (ELAVL1) and provided the first selective small-molecule strategy to disrupt CELF1\\u2013RNA binding therapeutically.\",\n      \"evidence\": \"FRET-FLIM nuclear interaction, RNAi, exon array; virtual screening, RNA-competition binding assay, in vivo fibrosis model\",\n      \"pmids\": [\"35973378\", \"35234905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of inhibitor binding not solved\", \"How CELF1/HuR cooperate vs antagonize across targets unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined the principal post-translational control of CELF1 stability and a covalent drug mechanism: PKC\\u03b1/\\u03b5 phosphorylation stabilizes CELF1 by reducing ubiquitination, and thiopurines covalently modify RRM-proximal cysteines to block RNA binding.\",\n      \"evidence\": \"MS phosphosite mapping, in vitro kinase assays, phosphomutant/xenograft analysis; biochemical disruption assay with cysteine mutagenesis and reducing-agent rescue\",\n      \"pmids\": [\"39343007\", \"39268573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase controlling CELF1 ubiquitination not identified\", \"Phosphorylation-driven RNA-binding inhibition in malignancy mechanistically distinct and only correlational (idx 22)\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identified a non-canonical translation-initiation mechanism, with CELF1 binding eIF4E and PABPC1 to drive eIF4G1-independent cap-dependent translation of GRE-containing EMT effectors, explaining its translational-activator role.\",\n      \"evidence\": \"Co-IP, in vitro binding, translation reporters, xenograft metastasis model\",\n      \"pmids\": [\"41755641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the same GRE-binder selects activation vs repression contexts unresolved\", \"Structure of the CELF1\\u2013eIF4E\\u2013PABPC1 complex unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected CELF1 to metabolism and to phase-separation-based splicing control, stabilizing Dio2 mRNA for thermogenesis and forming nuclear condensates (regulated by tRF-24/AKT1 at Ser28) that direct pro-oncogenic BIN1/BECN1 splicing.\",\n      \"evidence\": \"Adipocyte-specific knockout with metabolic phenotyping and RIP; FRAP, nuclear fractionation, phosphomutant analysis, splicing RNA-seq\",\n      \"pmids\": [\"40789858\", \"41250205\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phase-separation mechanism from single study\", \"Link between condensate formation and splice-site selection mechanistically incomplete\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved what molecular logic determines whether CELF1 represses, activates, or splices a given GRE-containing target, and how phosphorylation, localization, and condensate formation are integrated to switch between these outcomes.\",\n      \"evidence\": \"No single study in the corpus reconciles the determinants of CELF1's opposing activities on a shared element\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model for activation-vs-repression selection\", \"Effector choice (PARN vs RRP6 vs eIF4E) not predictable from sequence\", \"Full-length CELF1 structure on functional RNP absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 2, 3, 4, 8, 9, 11, 26, 39]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 1, 9, 26]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [8, 11, 13, 14, 36, 38]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [19, 23, 28, 29, 42]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 9, 38]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 19, 23, 42]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 11, 19, 38]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 2, 9, 11, 19]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [19, 23, 28, 29]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [8, 11, 14, 36, 38]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7, 12, 15, 30, 39]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [20, 21, 41, 42]}\n    ],\n    \"complexes\": [\n      \"stress granule\",\n      \"vegetal RNA localization RNP\"\n    ],\n    \"partners\": [\n      \"PARN\",\n      \"RRP6\",\n      \"ELAVL1\",\n      \"eIF4E\",\n      \"PABPC1\",\n      \"PRKCA\",\n      \"PRKCE\",\n      \"AKT1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}