{"gene":"ELAVL1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2001,"finding":"HuR selectively binds AU-rich elements (AREs) in the 3' untranslated regions of target mRNAs and stabilizes them, antagonizing ARE-mediated mRNA degradation. Newly identified protein ligands to HuR modulate its function in normal and stressed cells.","method":"RNA-binding assays, overexpression in cultured cells, review of experimental literature","journal":"Cellular and molecular life sciences : CMLS","confidence":"High","confidence_rationale":"Tier 2 / Strong — foundational finding replicated across multiple labs and studies; reviewed evidence from many orthogonal approaches","pmids":["11289308"],"is_preprint":false},{"year":2000,"finding":"HuR directly binds the 3'-UTRs of cyclin A and cyclin B1 mRNAs in a cell cycle-dependent manner, stabilizing these transcripts during S and G2 phases and thereby promoting cell proliferation. HuR translocates from the nucleus to the cytoplasm during late G1, S, and G2 phases.","method":"Gel-shift assays with radiolabeled RNA, anti-HuR supershift assays, antisense HuR knockdown, mRNA half-life measurement, cell cycle synchronization","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct RNA binding demonstrated by gel-shift and supershift, functional consequence validated by mRNA half-life in knockdown cells","pmids":["10811625"],"is_preprint":false},{"year":2002,"finding":"AMP-activated kinase (AMPK) regulates the level of cytoplasmic HuR: AMPK inhibition increases cytoplasmic HuR and enhances HuR binding to p21, cyclin B1, and cyclin A mRNAs, elevating their expression; AMPK activation reduces cytoplasmic HuR and decreases target mRNA stability.","method":"Dominant-negative and constitutively active AMPK adenovirus infection, cytoplasmic fractionation, RNA-protein binding assays, mRNA half-life measurement","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic and pharmacological perturbations of AMPK in same study with consistent results; functional readout via mRNA binding and stability","pmids":["11971974"],"is_preprint":false},{"year":2003,"finding":"HuR binds to three specific sites in the 3'-UTR of COX-2 mRNA and stabilizes it post-transcriptionally. HuR knockdown by RNAi or antisense attenuated serum withdrawal-induced COX-2 mRNA and protein accumulation.","method":"RNA immunoprecipitation from cell extracts, RNAi and antisense knockdown, mRNA level quantification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding sites mapped, functional validation by two independent knockdown methods","pmids":["12704185"],"is_preprint":false},{"year":2003,"finding":"HuR regulates beta-catenin mRNA in colon carcinoma cells; HuR overexpression increases tumor growth in vivo, while HuR knockdown (siRNA or antisense) slows growth, establishing HuR as a positive regulator of colon carcinogenesis through target mRNA stabilization.","method":"Immunohistochemistry, gene expression profiling, RNAi/antisense knockdown, xenograft tumor model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — beta-catenin mRNA identified as target, in vivo validation, but molecular mechanism of stabilization not deeply dissected in this paper","pmids":["14562043"],"is_preprint":false},{"year":2007,"finding":"HuR promotes cell survival by binding and stabilizing/enhancing translation of mRNAs encoding anti-apoptotic proteins including ProTα, SIRT1, Bcl-2, and Mcl-1, orchestrating a broad anti-apoptotic gene expression program.","method":"RNA immunoprecipitation, translation assays, mRNA stability assays reviewed from multiple studies","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple target mRNAs demonstrated by RNA-IP and functional assays across studies reviewed; individual experiments documented","pmids":["17534146"],"is_preprint":false},{"year":2008,"finding":"Phosphorylation of HuR at serine 242 inhibits its cytoplasmic localization and mRNA-stabilizing function. The non-phosphorylatable S242A mutant accumulates in the cytoplasm, shows increased association with cyclin A2 and B1 mRNAs, stabilizes these mRNAs, and heightens cell proliferation. The phosphomimetic S242D mutant remains nuclear under all conditions.","method":"Site-directed mutagenesis of HuR hinge region, subcellular fractionation, RNA immunoprecipitation, mRNA half-life assay, cell proliferation assay","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with localization, RNA binding, mRNA stability, and proliferation readouts in one study","pmids":["18948743"],"is_preprint":false},{"year":2008,"finding":"miR-519 represses HuR translation by interacting with its coding region and 3'-UTR, reducing HuR protein abundance without altering HuR mRNA levels, and consequently decreasing HuR-regulated target mRNA levels and cell proliferation.","method":"miR-519 precursor/antisense overexpression, reporter constructs with HuR coding region or 3'-UTR, polysome profiling, [3H]-thymidine incorporation, RNAi rescue experiments","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods including polysome profiling, reporter assays, and RNAi rescue; consistent findings","pmids":["19088191"],"is_preprint":false},{"year":2009,"finding":"HuR binds to the 3'-UTR of DNMT3b mRNA, stabilizing it and increasing DNMT3b expression. Cisplatin treatment dissociates the HuR-DNMT3b mRNA complex, promoting DNMT3b mRNA decay, reducing DNMT3b protein, and lowering global DNA methylation.","method":"Ribonucleoprotein immunoprecipitation followed by RT-qPCR, biotinylated RNA pulldown with western blot, mRNA decay assay, methylation analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal pulldown and IP, mRNA stability assay, and functional methylation readout in one study","pmids":["19270063"],"is_preprint":false},{"year":2009,"finding":"Genetic ablation of HuR causes embryonic lethality at midgestation due to placental labyrinth defects; conditional deletion in embryonic cells reveals HuR controls posttranscriptional regulation of transcription and growth factor mRNAs guiding placental morphogenesis, skeletal specification, and splenic ontogeny.","method":"Conditional knockout mice (embryonic and endothelial compartments), gene expression analysis, HuR-RNA association assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous genetic model with conditional tissue-specific ablation and RNA-binding evidence; phenotype definitively linked to HuR loss","pmids":["19307312"],"is_preprint":false},{"year":2010,"finding":"HuR promotes XIAP translation via the IRES element in XIAP mRNA 5'-UTR: HuR binds XIAP IRES in vitro and in vivo and stimulates recruitment of XIAP mRNA into polysomes, contributing to HuR-mediated cytoprotection from apoptosis.","method":"UV cross-linking, RNA immunoprecipitation, polysome profiling, IRES-reporter assay, etoposide-apoptosis rescue experiment","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro and in vivo binding, polysome profiling, and functional rescue experiment","pmids":["21102524"],"is_preprint":false},{"year":2010,"finding":"Methylated HuR (methyl-HuR) acts as an inhibitor of MAT2A mRNA stability, whereas non-methylated HuR promotes MAT2A mRNA stability. S-adenosylmethionine shifts the balance between methyl-HuR and HuR, regulating hepatic differentiation-dependent MAT expression.","method":"RNA immunoprecipitation, mRNA stability assays, immunofluorescence, manipulation of SAM levels in hepatic cell models","journal":"Gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct demonstration of differential effects of methylated vs. non-methylated HuR on MAT2A mRNA; single lab but multiple methods","pmids":["20102719"],"is_preprint":false},{"year":2010,"finding":"PKCβ phosphorylates/activates HuR in the retina under diabetic conditions, leading to HuR binding to VEGF mRNA and elevated VEGF protein expression; PKCβ inhibition blocks this pathway.","method":"Immunoprecipitation coupled to RT-PCR for RNP complexes, PKCβ inhibitor treatment in diabetic rat model, western blot for HuR phosphorylation","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — demonstrated HuR phosphorylation by PKCβ and binding to VEGF mRNA in vivo in rat model with pharmacological intervention","pmids":["20599775"],"is_preprint":false},{"year":2011,"finding":"Targeted deletion of HuR in germ cells causes male sterility due to spermatocyte death at meiosis and spermatid elongation failure. HuR specifically binds Hspa2 mRNA and controls its expression at the translational level in germ cells.","method":"Conditional germ cell-specific knockout mice, target gene approach, RNA binding assay, translational regulation analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic evidence from conditional KO model with defined cellular phenotype; Hspa2 established as translational target by RNA binding and expression analysis","pmids":["21737689"],"is_preprint":false},{"year":2011,"finding":"HuR interacts with nucleolin mRNA 3'-UTR and promotes nucleolin translation without affecting mRNA levels; loss of HuR mobilizes nucleolin mRNA to processing bodies (PBs). HuR and miR-494 competitively regulate nucleolin expression, and HuR-driven cell proliferation is partly mediated through increased nucleolin expression.","method":"RIP, MS2-tagged RNA tracking to PBs, miRNA immunoprecipitation with Argonaute, reporter assay, HuR/miR-494 competitive overexpression/knockdown","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods including tagged RNA localization, Ago-IP, and functional competition assay","pmids":["21859890"],"is_preprint":false},{"year":2016,"finding":"HuR binds lncRNA RMRP in the nucleus and mediates its CRM1-dependent export to the cytoplasm. After RMRP import into mitochondria, GRSF1 binds RMRP and maintains its mitochondrial abundance, supporting oxygen consumption and mitochondrial DNA replication priming.","method":"Affinity RNA pulldown with mass spectrometry, RNA immunoprecipitation, CRM1 inhibition, mitochondrial fractionation, oxygen consumption rate measurement","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — mass spectrometry identification confirmed by RIP, pharmacological inhibition of export, and organelle fractionation with functional readout","pmids":["27198227"],"is_preprint":false},{"year":2016,"finding":"lncRNA OIP5-AS1 (cyrano) acts as a sponge/ceRNA for HuR: high OIP5-AS1 sequesters HuR away from its target mRNAs, preventing HuR-mediated proliferative mRNA stabilization, while HuR stabilizes OIP5-AS1. miR-424 competes with HuR for binding to OIP5-AS1.","method":"MS2-hairpin RNA tagging and pulldown, miRNA/HuR competition assay, RNA immunoprecipitation, cell proliferation assays with OIP5-AS1 modulation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA pulldown and RIP demonstrate competing interactions; functional sponge effect on HuR-target mRNAs shown; single lab","pmids":["26819413"],"is_preprint":false},{"year":2016,"finding":"HuR controls the expression of multiple nuclear import machinery components, and is required for nuclear import of CRABP2 (via classical-like NLS) and heregulin-induced nuclear translocation of NFκB p65, thereby regulating transcriptional activities of RAR and NFκB.","method":"HuR knockdown, subcellular localization assays, nuclear import assays, transcriptional reporter assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined molecular readout on nuclear import; single lab","pmids":["27609837"],"is_preprint":false},{"year":2017,"finding":"The natural product dihydrotanshinone-I (DHTS) binds to residues within HuR RRM1 and RRM2 domains (identified by NMR titration and molecular dynamics), stabilizing HuR in a locked conformation that competitively inhibits RNA binding. In cells, DHTS preferentially displaces HuR from mRNAs with short 3'-UTRs or lower ARE density.","method":"NMR titration, molecular dynamics simulation, RNA electrophoretic mobility shift assay, AlphaScreen binding assay, RIP-chip transcriptome-wide analysis, xenograft model","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural data combined with in vitro binding assays and transcriptome-wide RIP in cells; mechanism of competitive inhibition mapped to specific residues","pmids":["28934484"],"is_preprint":false},{"year":2018,"finding":"HuR promotes ferroptosis in hepatic stellate cells by binding AU-rich elements in the 3'-UTR of BECN1 (Beclin1) mRNA, stabilizing it and activating autophagy/ferritinophagy. ELAVL1 expression is induced by inhibition of ubiquitin-proteasome pathway during ferroptosis induction.","method":"siRNA/plasmid manipulation of ELAVL1, BECN1 3'-UTR deletion analysis, RIP assay, autophagy flux assays, mouse model of liver fibrosis with HSC-specific ELAVL1 knockdown","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct RNA binding to BECN1 3'-UTR F3 region confirmed by RIP and deletion analysis; in vivo validation in mouse model; multiple orthogonal methods","pmids":["30081711"],"is_preprint":false},{"year":2019,"finding":"HuR comprises three RNA recognition motifs (RRMs); RRM3 mediates canonical RNA binding AND a dimerization interface on its α-helical face. Full-length HuR adopts a compact conformation upon RNA binding (free protein is flexible by NMR/SAXS). RRM3 dimerization and RNA binding are both required for HuR functional activity in vitro and in cells.","method":"Crystal structures of RRM3 free and RNA-bound, NMR, SAXS, biochemical binding assays, RRM3 mutagenesis, target mRNA level assays in human cells","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures combined with NMR, SAXS, biochemical and cellular mutagenesis; multiple orthogonal structural and functional methods","pmids":["30418581"],"is_preprint":false},{"year":2018,"finding":"HuR binds the 3'-UTR of TIN2 mRNA, destabilizing TIN2 mRNA and reducing its translation. Loss of HuR during replicative senescence increases TIN2 expression, enhancing mitochondrial TIN2 localization and ROS production, thereby promoting cellular senescence.","method":"RIP, mRNA stability assay, HuR knockdown/overexpression, mitochondrial fractionation, ROS measurement","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding demonstrated by RIP; negative regulatory function on TIN2 mRNA shown by stability and translation assays; functional consequence through mitochondrial pathway","pmids":["29584879"],"is_preprint":false},{"year":2018,"finding":"HuR binds TERC RNA and promotes TERC C106 methylation, facilitating TERC/TERT complex assembly and telomerase activity. Dyskeratosis congenita-related TERC mutations (U100A, G107U, GC107/108AG) impair HuR binding, reducing C106 methylation, decreasing telomerase activity, and causing telomere shortening and hematopoietic stem cell renewal defects.","method":"RNA immunoprecipitation, methylation assays, TERC mutation analysis, HuR knockout mice (hematopoietic stem cells), telomerase activity assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — novel function demonstrated by RIP, biochemical methylation assays, DC-related mutations, and in vivo HSC phenotype","pmids":["29880812"],"is_preprint":false},{"year":2018,"finding":"HuR binds MEF2C mRNA and protects it from degradation, increasing MEF2C levels which in turn transcriptionally enhance SCN5A expression. HuR overexpression increased SCN5A mRNA, an effect attenuated by MEF2C siRNA.","method":"RNP immunoprecipitation (RIP), mRNA stability assay, ChIP-qPCR, EMSA, MEF2C siRNA rescue experiment","journal":"Journal of the American Heart Association","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP confirms HuR-MEF2C mRNA binding; ChIP and EMSA establish MEF2C-SCN5A link; rescue experiment validates pathway; single lab","pmids":["29678826"],"is_preprint":false},{"year":2019,"finding":"Adipose-specific HuR knockout mice show obesity and metabolic dysfunction. HuR positively regulates ATGL (adipose triglyceride lipase) expression by promoting both mRNA stability and translation of ATGL, thereby controlling lipolysis.","method":"Adipose-specific HuR KO mice, mRNA stability assay, translation assay, RIP","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO model, direct RNA binding confirmed by RIP, and multiple functional readouts (mRNA stability and translation)","pmids":["31147543"],"is_preprint":false},{"year":2020,"finding":"HuR forms complexes with NAFLD-relevant transcripts: it associates with intron 24 of Apob pre-mRNA to regulate alternative splicing, with the 3'-UTR of Uqcrb to regulate translation, and with the 5'-UTR of Ndufb6 mRNA to regulate NDUFB6 translation. Hepatocyte-specific HuR KO reduces APOB, UQCRB, and NDUFB6 expression, impairing lipid transport and ATP synthesis.","method":"RNA immunoprecipitation, hepatocyte-specific KO mice, adenovirus re-expression rescue, mRNA splicing analysis, translation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO with adenoviral rescue, RIP confirmation of binding to distinct RNA elements with distinct functional outcomes (splicing vs. translation)","pmids":["32546794"],"is_preprint":false},{"year":2020,"finding":"HuR stabilizes PLB (phospholamban) mRNA and destabilizes β1-AR mRNA in cardiomyocytes. Cardiomyocyte-specific HuR deletion mitigates isoproterenol-induced PLB expression, aggravating myocardial hypertrophy.","method":"Cardiomyocyte-specific HuR KO mouse, RIP assay for PLB and β1-AR mRNAs, mRNA stability assays","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO model with direct RNA binding confirmation by RIP; opposite regulatory effects on two target mRNAs shown","pmids":["31373621"],"is_preprint":false},{"year":2020,"finding":"Fat-specific knockout of HuR enhances adipogenic gene programs and causes depot-specific phenotypes, including repression of myogenesis in brown fat, enhanced inflammation in epididymal white fat, and induction of browning in inguinal white fat. HuR inhibits adipogenesis at least partly by modulating stability of Insig1 mRNA.","method":"Fat-specific HuR KO mice, RNA-seq, mRNA stability assays, in vitro adipogenesis assays with HuR knockdown/overexpression","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO with RNA-seq and defined molecular mechanism (Insig1 mRNA stability); multiple orthogonal approaches","pmids":["31924774"],"is_preprint":false},{"year":2020,"finding":"HuR suppresses Fas (death receptor) mRNA translation by binding to two AU-rich domains in the Fas mRNA 3'-UTR, preventing Fas-mediated apoptosis in hepatocellular carcinoma cells. Hydrodynamic transfection of HuR plasmid in mice induced Fas downregulation and resistance to Fas agonist.","method":"RIP, 3'-UTR reporter assay, HuR silencing and Fas protein/surface expression assays, in vivo hydrodynamic transfection","journal":"Molecular cancer research : MCR","confidence":"High","confidence_rationale":"Tier 2 / Moderate — binding sites mapped, translational repression confirmed by reporter assay; in vivo validation; direct mechanistic link established","pmids":["25678597"],"is_preprint":false},{"year":2015,"finding":"HuR/ELAVL1 is the predominant RNA-binding protein associating with the IFN-β mRNA ARE; reduced HuR expression or chemical inhibition severely impairs the type I IFN response in multiple cell types, demonstrating HuR as a key potentiator of innate antiviral signaling through IFN-β mRNA stabilization.","method":"Affinity proteomic pulldown of IFN-β ARE with mass spectrometry, HuR knockdown, chemical inhibition, type I IFN response measurement in fibroblast-like synoviocytes","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mass spectrometry-identified binding confirmed by functional knockdown/inhibition; physiologically relevant cell types tested","pmids":["25678110"],"is_preprint":false},{"year":2015,"finding":"ECRG2 tumor suppressor negatively regulates HuR by promoting its ubiquitination and proteasomal degradation; ECRG2 expression reduces XIAP mRNA stability through HuR, inducing apoptosis. Cancer-derived ECRG2 V30E mutant fails to degrade HuR or suppress XIAP.","method":"Ubiquitination assay, HuR stability measurement, XIAP mRNA stability assay, caspase activation, mutant analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination of HuR shown by ECRG2; mechanistic link through XIAP mRNA; cancer mutant validation; single lab","pmids":["26434587"],"is_preprint":false},{"year":2016,"finding":"In myogenesis, HuR must translocate to the cytoplasm to stabilize myogenic factor mRNAs; cytoplasmic HuR accumulation requires its dissociation from the nuclear import factor Transportin 2 (TRN2), triggered by proteolytic cleavage of a portion of cytoplasmic HuR.","method":"Review of experimental findings from the same group: cleavage assays, Transportin-2 interaction assays, myogenesis models","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic details of TRN2 dissociation and HuR cleavage described from experimental work; review paper summarizing prior experimental findings","pmids":["21315776"],"is_preprint":false},{"year":2014,"finding":"HuR binds the 3'-UTR of ABCA1 mRNA and promotes ABCA1 translation, increasing cholesterol efflux. Cholesterol levels regulate HuR expression, localization, and its interaction with ABCA1 mRNA.","method":"RNA immunoprecipitation, HuR knockdown, cholesterol efflux assay, cell fractionation","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP confirms direct binding; functional cholesterol efflux assay validates biological relevance; single lab","pmids":["24729624"],"is_preprint":false},{"year":2014,"finding":"HSF1 regulates β-catenin expression at the translational level by controlling HuR levels; HuR in turn controls β-catenin translation. mTOR phosphorylation of HSF1 at S326 promotes β-catenin expression through a mechanism requiring HuR.","method":"HSF1 gain/loss-of-function, HuR level quantification, translation assays, mTOR knockdown with HuR-dependent rescue","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis established (mTOR → HSF1 → HuR → β-catenin translation); mTOR knockdown rescue experiment; single lab","pmids":["24954509"],"is_preprint":false},{"year":2018,"finding":"HuR binds the 3'-UTR of BECN1 mRNA via the F3 AU-rich region, stabilizing it and activating autophagy. Internal deletion of the F3 region abrogated HuR-mediated BECN1 mRNA stability and ferroptosis.","method":"RIP assay, BECN1 3'-UTR deletion constructs, mRNA stability assay, autophagy flux monitoring","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct RIP binding, fine-mapped to F3 deletion; functional consequence on autophagy validated","pmids":["30081711"],"is_preprint":false},{"year":2022,"finding":"HuR regulates glutaminase (GLS) mRNA alternative splicing and isoform translation/stability in breast cancer. ELAVL1 knockdown reduces KGA isoform and increases GAC levels, enhancing glutamine anaplerosis into the TCA cycle. Combining GLS chemical inhibition with ELAVL1 silencing synergistically decreases breast cancer cell growth.","method":"ELAVL1 knockdown, isoform quantification by RT-PCR, metabolic flux analysis (glutamine anaplerosis), cell viability assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — alternative splicing and metabolic flux measured after ELAVL1 knockdown; multiple orthogonal functional readouts; novel dual function (splicing and translation/stability)","pmids":["38965208"],"is_preprint":false},{"year":2022,"finding":"HuR is required for maintenance of cranial neural crest specification by stabilizing Draxin mRNA; Elavl1 perturbation reduces Draxin mRNA levels and causes premature neural crest delamination, and exogenous Draxin rescues the specification defects.","method":"siRNA/antisense perturbation in chick embryos, RNA-seq, RIP, RNA decay measurement, proximity ligation assay, rescue with exogenous Draxin","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RIP, RNA decay, RNA-seq, proximity ligation) plus rescue experiment identifying Draxin as primary stabilization target","pmids":["36189921"],"is_preprint":false},{"year":2018,"finding":"HuR binds HuR (ELAVL1) mRNA 3'-UTR and upregulates TRIM21 translation, while TRIM21 degrades HuR protein in response to UV radiation, constituting a negative feedback loop that regulates p53 levels in genotoxic stress.","method":"RIP showing HuR binding to TRIM21 mRNA 3'-UTR, TRIM21 ubiquitination of HuR assay, cell proliferation/colony formation, DHTS inhibitor treatment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and functional assays demonstrate feedback loop; single lab, single paper","pmids":["32678213"],"is_preprint":false},{"year":2022,"finding":"PLK1 phosphorylates and modulates ELAVL1/HuR availability; HuR in turn binds to the 3'-end of miR-122, promoting its biogenesis and consequently HCV proliferation. PLK1 inhibition by rigosertib reduces HuR-miR-122 signaling and HCV replication.","method":"Kinase inhibitor library screening, rescue experiments with HuR overexpression/knockdown, HCV mutant with low miR-122 dependency, replicon and infectious cell models, in vivo replicon-harboring mice","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple rescue experiments and HCV mutant validation; in vivo confirmation; novel function of HuR in miRNA biogenesis established","pmids":["36512502"],"is_preprint":false},{"year":2021,"finding":"HuR binds to AMPKα1 and AMPKα2 mRNAs in smooth muscle cells, increasing their stability and translation; smooth muscle-specific HuR KO reduces p-AMPK and LC3II while increasing p62, causing defective autophagy and enhanced atherosclerosis.","method":"Smooth muscle-specific HuR KO mice, RNA immunoprecipitation, mRNA stability assay, autophagy markers, atherosclerosis model","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with RIP confirming binding; functional pathway (HuR→AMPK→autophagy) validated by pharmacological AMPK activation rescue","pmids":["33837179"],"is_preprint":false},{"year":2022,"finding":"LINC00941 forms an RNA-protein complex with ELAVL1/HuR to inhibit autophagosome-lysosome fusion. The LINC00941-ELAVL1 complex controls stability of EZH2, STAT1, and FOXK1 mRNAs, thereby blocking autophagy and promoting pulmonary fibrosis.","method":"RNA affinity isolation, RIP, RNase-RIP, half-life analysis, ubiquitination experiments, autophagic flux monitoring, RIP-seq, rescue experiments","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays and RIP-seq identify complex and target mRNAs; single lab but several orthogonal methods","pmids":["35427207"],"is_preprint":false},{"year":2019,"finding":"WTAP-mediated m6A modification of ETS1 mRNA leads to its post-transcriptional suppression; HuR is implicated as an RNA stabilizer in this pathway. m6A modification reduces ETS1 mRNA stability in an HuR-dependent manner in HCC.","method":"MeRIP assay, RIP assay, dual luciferase reporter, m6A dot blot, ChIP","journal":"Molecular cancer","confidence":"Low","confidence_rationale":"Tier 3 / Weak — RIP demonstrates HuR binding but the mechanism of how m6A affects HuR-ETS1 mRNA interaction is not deeply characterized; single lab","pmids":["31438961"],"is_preprint":false},{"year":2020,"finding":"HuR binds Cx40 mRNA in cardiac endothelial cells and stabilizes it; HuR deficiency in diabetic mice reduces Cx40 expression, contributing to coronary microvascular dysfunction. Endothelial-specific HuR-KO mice display decreased coronary flow velocity reserve and capillary density.","method":"Endothelial-specific HuR KO mice, RIP showing HuR-Cx40 mRNA binding, coronary flow velocity reserve measurement, capillary density quantification, Cx40-KO mice comparison","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO, direct RIP evidence, and Cx40-KO phenocopy provide mechanistic pathway","pmids":["34747371"],"is_preprint":false},{"year":2015,"finding":"HuR stabilization function during T cell activation is temporally regulated: HuR-dependent robust mRNA stabilization occurs at 4 h post-activation, coordinating stabilization of functionally related mRNA subpopulations (replicative histones, ribosomal biogenesis, cell motility), demonstrated by integrating PAR-CLIP binding data with metabolic labeling-based mRNA stability measurements.","method":"Metabolic mRNA labeling for transcription and decay rates, PAR-CLIP data integration, Jurkat T cell activation time course","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — novel analytical integration of genome-wide binding and stability data; single lab but orthogonal methods (metabolic labeling + CLIP)","pmids":["26490963"],"is_preprint":false},{"year":2022,"finding":"HuR-mediated cytoplasmic translocation of HOTAIR lncRNA promotes osteoblast function: HuR is responsible for HOTAIR nucleocytoplasmic translocation during BMSC osteogenic differentiation; cytoplasmic HOTAIR acts as ceRNA for miR-214 to increase Atf4 expression.","method":"BMSC/osteoblast localization studies, HuR RIP, HuR knockdown/overexpression, transgenic mice (Prx1- and Bglap-HOTAIR), ceRNA assay","journal":"Bone research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP confirms HuR-HOTAIR binding; functional consequence on nucleocytoplasmic translocation demonstrated; in vivo validation in transgenic mice","pmids":["37872163"],"is_preprint":false},{"year":2018,"finding":"HuR promotes SOD2 mRNA translation specifically upon anchorage-independence; HuR translocates to the cytosol in response to matrix detachment (promoted by p38 MAPK activation), binds SOD2 mRNA, and increases its association with heavy polysomes for nascent protein synthesis.","method":"HuR siRNA knockdown, polyribosome profiling, RIP assay, p38 MAPK inhibition, nascent protein synthesis measurement","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — polysome profiling and RIP confirm translational mechanism; p38 requirement for HuR-SOD2 interaction demonstrated; multiple methods","pmids":["35594792"],"is_preprint":false},{"year":2018,"finding":"HuR stabilizes HuR (ELAVL1) mRNA/binds HuR target mRNAs in neurons; neuron-specific HuR deficiency leads to motor neuron disease phenotype with apoptosis of pyramidal neurons and α motor neurons, TDP43 redistribution to cytosolic granules, and altered expression of HuR-regulated genes including SOD1 and Bcl2 in the brain.","method":"Inducible neuron-specific HuR KO mice, immunostaining for cleaved caspase-3, genome-wide microarray, rotarod and grip-strength tests, TDP43 localization assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined cellular phenotype (motor neuron apoptosis, TDP43 redistribution); genome-wide target analysis; single lab","pmids":["29760195"],"is_preprint":false},{"year":2015,"finding":"Let-7 mimic (ssDNA complementary to let-7 binding site) enhances the affinity of HuR for a 122-nt MYC RNA containing both HuR and let-7 binding sites, demonstrating cooperative biophysical binding between HuR and a miRNA at distal mRNA binding sites.","method":"In vitro RNA binding affinity assays with let-7 mimic and recombinant HuR on MYC RNA","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — reconstituted in vitro cooperative binding demonstrated but single lab, single biochemical method","pmids":["26177105"],"is_preprint":false},{"year":2023,"finding":"A single-domain antibody (VHH) binding HuR with low nanomolar affinity inhibits HuR-RNA binding; engineering this VHH into a TRIM21-based bioPROTAC degrades endogenous HuR, reversing tumor-promoting properties of cancer cells in vivo by altering the HuR-regulated proteome.","method":"VHH antibody selection and characterization, HuR-RNA binding inhibition assay, bioPROTAC engineering, in vivo xenograft degradation and proteome analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — demonstrates direct inhibition of HuR-RNA binding by VHH, functional HuR degradation in vivo with proteome-level readout; multiple methods","pmids":["37925433"],"is_preprint":false},{"year":2020,"finding":"HuR binds to and stabilizes EZH2, STAT1, and FOXK1 mRNAs when complexed with LINC00941, preventing autophagosome-lysosome fusion; this is demonstrated by ELAVL1 RIP-seq, RIP-PCR, and mRNA stability measurements.","method":"ELAVL1 RIP-seq, RIP-PCR, mRNA stability assay, rescue experiments","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq and mRNA stability confirm binding and stabilization; rescue experiments link complex to autophagy inhibition; single lab","pmids":["35427207"],"is_preprint":false}],"current_model":"ELAVL1/HuR is a ubiquitously expressed RNA-binding protein that recognizes AU-rich elements (AREs) in target mRNAs through its three RNA recognition motifs (RRM1/2 for primary binding; RRM3 for additional RNA contacts and RRM3-mediated dimerization required for full function), and post-transcriptionally regulates mRNA stability, translation, splicing, and nucleo-cytoplasmic export of bound transcripts; HuR is predominantly nuclear but translocates to the cytoplasm in response to stress, proliferative, and metabolic signals—regulated in part by phosphorylation (e.g., at S242 by Cdk1, which retains HuR in the nucleus; PKCβ-mediated phosphorylation activates it) and by AMPK-dependent mechanisms—where it stabilizes and/or promotes translation of target mRNAs encoding proteins involved in cell proliferation (cyclins A/B1), survival (Bcl-2, Mcl-1, XIAP, ProTα), metabolism (ATGL, APOB, GLS isoforms), differentiation, and immune signaling (IFN-β, COX-2, IL-8), while also mediating novel functions including TERC methylation to support telomerase assembly, lncRNA nuclear export (RMRP via CRM1), and regulation of alternative splicing; its availability is controlled by miRNAs (e.g., miR-519 suppresses HuR translation) and lncRNA/circRNA sponges (OIP5-AS1, circDDIT4), and HuR activity is subject to negative regulation by ubiquitin-mediated degradation (via TRIM21/ECRG2) and by posttranslational methylation."},"narrative":{"mechanistic_narrative":"ELAVL1/HuR is a ubiquitously expressed RNA-binding protein that post-transcriptionally controls gene expression by selectively binding AU-rich elements (AREs) in target mRNA 3'-UTRs and antagonizing ARE-mediated decay to stabilize transcripts [PMID:11289308, PMID:10811625]. Structurally it uses three RNA recognition motifs, with RRM3 contributing both RNA contacts and a dimerization interface; RNA binding drives the flexible apo-protein into a compact conformation, and both RRM3 dimerization and RNA binding are required for full activity [PMID:30418581]. Through these activities HuR governs proliferation by stabilizing cyclin A and cyclin B1 mRNAs in a cell cycle-dependent manner [PMID:10811625], and orchestrates a broad pro-survival program by stabilizing or enhancing translation of anti-apoptotic mRNAs (ProTα, SIRT1, Bcl-2, Mcl-1, XIAP) [PMID:17534146, PMID:21102524] while repressing pro-death targets such as Fas [PMID:25678597]. Beyond mRNA stability, HuR regulates cap-independent translation via IRES (XIAP) [PMID:21102524], alternative splicing and isoform selection (Apob pre-mRNA, glutaminase GLS) [PMID:32546794, PMID:38965208], and nucleo-cytoplasmic export of lncRNAs (RMRP via CRM1, HOTAIR) [PMID:27198227, PMID:37872163], and supports telomerase assembly by binding TERC RNA and promoting C106 methylation [PMID:29880812]. HuR is predominantly nuclear but translocates to the cytoplasm in response to proliferative, stress, and metabolic cues; this shuttling is governed by phosphorylation—Cdk1-type phosphorylation at S242 retains HuR in the nucleus and limits target binding [PMID:18948743], while PKCβ and p38 MAPK signaling promote its cytoplasmic activity [PMID:20599775, PMID:35594792]—and by AMPK-dependent control of cytoplasmic HuR levels [PMID:11971974]. In vivo, conditional and tissue-specific knockouts establish essential roles in placental and embryonic development [PMID:19307312], spermatogenesis [PMID:21737689], adipose lipolysis and adipogenesis [PMID:31147543, PMID:31924774], hepatic lipid metabolism [PMID:32546794], and cardiac and vascular function [PMID:31373621, PMID:34747371]. HuR abundance and activity are themselves tightly regulated: miR-519 represses its translation [PMID:19088191], lncRNA/ceRNA sponges such as OIP5-AS1 sequester it [PMID:26819413], and TRIM21- and ECRG2-driven ubiquitination targets it for proteasomal degradation [PMID:26434587, PMID:32678213].","teleology":[{"year":2000,"claim":"Established that HuR is a sequence-specific ARE-binding protein that physically stabilizes target mRNAs, defining its core molecular activity and linking it to cell cycle progression.","evidence":"Gel-shift/supershift assays, antisense knockdown, and mRNA half-life measurement on cyclin A and B1 in synchronized cells","pmids":["10811625","11289308"],"confidence":"High","gaps":["Did not resolve how nuclear HuR reaches cytoplasmic targets","Mechanism of decay antagonism at the molecular level not defined"]},{"year":2002,"claim":"Showed that metabolic signaling through AMPK sets the level of cytoplasmic HuR, connecting energy status to ARE-mRNA stabilization.","evidence":"Dominant-negative/constitutively active AMPK adenovirus, cytoplasmic fractionation, RNA binding and half-life assays","pmids":["11971974"],"confidence":"High","gaps":["Direct vs. indirect AMPK effect on HuR not distinguished","No phosphosite mapping in this study"]},{"year":2003,"claim":"Extended HuR target repertoire to inflammatory (COX-2) and oncogenic (beta-catenin) transcripts and provided in vivo evidence for a pro-tumorigenic role.","evidence":"RNA immunoprecipitation, RNAi/antisense knockdown, expression profiling, and xenograft tumor models","pmids":["12704185","14562043"],"confidence":"High","gaps":["beta-catenin stabilization mechanism not deeply dissected","Upstream signals controlling target selectivity unclear"]},{"year":2007,"claim":"Consolidated HuR as a master regulator of an anti-apoptotic program acting through both mRNA stabilization and translational enhancement.","evidence":"Review integrating RNA-IP, translation, and stability assays for ProTα, SIRT1, Bcl-2, Mcl-1","pmids":["17534146"],"confidence":"Medium","gaps":["Relative contribution of stability vs. translation per target not quantified","Compiled from multiple studies rather than one reconstituted system"]},{"year":2008,"claim":"Identified phosphorylation as the switch controlling HuR localization and activity, showing S242 phosphorylation enforces nuclear retention and dampens target binding/proliferation.","evidence":"S242A/S242D mutagenesis with fractionation, RIP, mRNA half-life, and proliferation assays; plus miR-519 reporter, polysome, and rescue assays","pmids":["18948743","19088191"],"confidence":"High","gaps":["Physiological kinase for S242 not definitively assigned in these studies","How phosphorylation alters RNA affinity structurally unknown"]},{"year":2009,"claim":"Genetic ablation demonstrated that HuR is essential for development, with target mRNAs guiding placental, skeletal, and splenic morphogenesis, and expanded targets to the epigenetic enzyme DNMT3b.","evidence":"Conditional knockout mice with expression and HuR-RNA association assays; RNP-IP, biotin pulldown, and methylation analysis for DNMT3b","pmids":["19307312","19270063"],"confidence":"High","gaps":["Which target mRNAs are rate-limiting for each developmental phenotype not resolved","Stress-induced complex dissociation mechanism (cisplatin) not defined"]},{"year":2010,"claim":"Broadened HuR's mechanistic scope to IRES-mediated translation (XIAP) and revealed that posttranslational methylation reverses its effect on a target (MAT2A), introducing PKCβ as an activating kinase.","evidence":"UV cross-linking, polysome profiling, IRES reporter, apoptosis rescue; RIP and SAM manipulation; RNP-IP with PKCβ inhibition in diabetic rat retina","pmids":["21102524","20102719","20599775"],"confidence":"High","gaps":["Methyltransferase responsible for HuR methylation not identified here","Structural basis for methylation-dependent functional reversal unknown"]},{"year":2011,"claim":"Tissue-specific knockout showed HuR controls translation of germ cell mRNAs (Hspa2) required for meiosis, and clarified translational regulation vs. P-body sequestration for nucleolin.","evidence":"Germ cell-specific KO mice with RNA binding/translation assays; RIP, MS2 RNA tracking to P-bodies, Ago-IP and miR-494 competition","pmids":["21737689","21859890"],"confidence":"High","gaps":["How HuR selects translational vs. stability mode per target not defined","Trigger for nucleolin mRNA mobilization to P-bodies upon HuR loss unclear"]},{"year":2016,"claim":"Revealed non-canonical roles in lncRNA nuclear export (RMRP via CRM1) and showed that lncRNA sponges (OIP5-AS1) and nuclear import machinery couple HuR to broader RNA and protein trafficking.","evidence":"Affinity RNA pulldown-MS, RIP, CRM1 inhibition, mitochondrial fractionation; MS2 pulldown and competition assays; nuclear import and reporter assays","pmids":["27198227","26819413","27609837"],"confidence":"High","gaps":["How HuR is partitioned between export and stabilization functions unknown","OIP5-AS1 sponge effect characterized in a single lab"]},{"year":2019,"claim":"Crystal/NMR/SAXS structural work defined RRM3 as both an RNA-contacting and dimerization module and established that RNA binding induces a compact conformation required for function.","evidence":"RRM3 crystal structures (free and RNA-bound), NMR, SAXS, mutagenesis, and target mRNA assays in cells","pmids":["30418581"],"confidence":"High","gaps":["Full-length multi-RRM/RNA complex structure not solved","How dimerization tunes target selectivity in vivo not established"]},{"year":2020,"claim":"In vivo conditional knockouts across adipose, liver, and heart defined HuR as a metabolic and cardiovascular regulator acting through distinct RNA elements (splicing, 5'/3'-UTR translation, stability) on multiple targets.","evidence":"Tissue-specific KO mice (adipose, hepatocyte, cardiomyocyte, endothelial) with RIP, mRNA stability, translation, splicing, and physiological readouts","pmids":["31147543","31924774","32546794","31373621","34747371"],"confidence":"High","gaps":["How a single protein achieves opposite effects (stabilize PLB vs destabilize β1-AR) on different targets unresolved","Tissue-specific cofactors directing target choice not identified"]},{"year":2022,"claim":"Defined HuR roles in metabolic reprogramming (GLS splicing), miRNA biogenesis (miR-122), developmental specification (Draxin), and demonstrated druggability via small molecules, structural inhibitors, and bioPROTAC degraders.","evidence":"ELAVL1 knockdown with isoform/flux analysis; PLK1 axis and HCV models; chick embryo RIP/rescue; NMR-guided DHTS inhibitor and VHH-TRIM21 bioPROTAC with in vivo proteome readout","pmids":["38965208","36512502","36189921","28934484","37925433"],"confidence":"High","gaps":["Generalizability of PLK1-HuR-miRNA axis beyond HCV unknown","Selectivity of degrader and inhibitor across the full HuR target proteome not fully mapped"]},{"year":null,"claim":"How HuR integrates phosphorylation, methylation, ubiquitination, miRNA, and lncRNA inputs to select among stabilization, translational, splicing, and export outcomes on a per-target basis remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified code linking PTM state to functional outcome","Determinants of opposite regulatory effects on distinct targets undefined","Full-length protein-RNA complex structure and in-cell conformational states unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,3,18,20]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[10,14,24,28,45]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,5,21]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,6,15,17]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,2,6,31,45]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,25,35]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,2,6]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5,10,28]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[19,34,39,40]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[10,14,24,45]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,13,36]}],"complexes":[],"partners":["TRIM21","ECRG2","OIP5-AS1","LINC00941","CRM1","TRN2","AMPK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15717","full_name":"ELAV-like protein 1","aliases":["Hu-antigen R","HuR"],"length_aa":326,"mass_kda":36.1,"function":"RNA-binding protein that binds to the 3'-UTR region of mRNAs and increases their stability (PubMed:14517288, PubMed:18285462, PubMed:31358969). Involved in embryonic stem cell (ESC) differentiation: preferentially binds mRNAs that are not methylated by N6-methyladenosine (m6A), stabilizing them, promoting ESC differentiation (By similarity). Has also been shown to be capable of binding to m6A-containing mRNAs and contributes to MYC stability by binding to m6A-containing MYC mRNAs (PubMed:32245947). Binds to poly-U elements and AU-rich elements (AREs) in the 3'-UTR of target mRNAs (PubMed:14731398, PubMed:17632515, PubMed:18285462, PubMed:23519412, PubMed:8626503). Binds avidly to the AU-rich element in FOS and IL3/interleukin-3 mRNAs. In the case of the FOS AU-rich element, binds to a core element of 27 nucleotides that contain AUUUA, AUUUUA, and AUUUUUA motifs. Binds preferentially to the 5'-UUUU[AG]UUU-3' motif in vitro (PubMed:8626503). With ZNF385A, binds the 3'-UTR of p53/TP53 mRNA to control their nuclear export induced by CDKN2A. Hence, may regulate p53/TP53 expression and mediate in part the CDKN2A anti-proliferative activity. May also bind with ZNF385A the CCNB1 mRNA (By similarity). Increases the stability of the leptin mRNA harboring an AU-rich element (ARE) in its 3' UTR (PubMed:29180010)","subcellular_location":"Cytoplasm; Nucleus; Cytoplasm, Stress granule; Cytoplasm, P-body","url":"https://www.uniprot.org/uniprotkb/Q15717/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ELAVL1","classification":"Not Classified","n_dependent_lines":225,"n_total_lines":1208,"dependency_fraction":0.18625827814569537},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"IGF2BP1","stoichiometry":4.0},{"gene":"CPSF6","stoichiometry":0.2},{"gene":"DDX21","stoichiometry":0.2},{"gene":"DDX5","stoichiometry":0.2},{"gene":"DDX6","stoichiometry":0.2},{"gene":"DHX9","stoichiometry":0.2},{"gene":"GSPT1","stoichiometry":0.2},{"gene":"HNRNPC","stoichiometry":0.2},{"gene":"HNRNPD","stoichiometry":0.2},{"gene":"HNRNPH1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ELAVL1","total_profiled":1310},"omim":[{"mim_id":"621353","title":"GLUTAMINE INSUFFICIENCY REGULATOR OF GLUTAMINASE LONG NONCODING RNA; GIRGL","url":"https://www.omim.org/entry/621353"},{"mim_id":"621052","title":"PLECKSTRIN HOMOLOGY DOMAIN-CONTAINING PROTEIN N1; PLEKHN1","url":"https://www.omim.org/entry/621052"},{"mim_id":"620723","title":"LONG INTERGENIC NONCODING RNA 2381; LINC02381","url":"https://www.omim.org/entry/620723"},{"mim_id":"616036","title":"MICRO RNA 494; MIR494","url":"https://www.omim.org/entry/616036"},{"mim_id":"610747","title":"STERILE ALPHA MOTIF DOMAIN-CONTAINING PROTEIN 4A; SAMD4A","url":"https://www.omim.org/entry/610747"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ELAVL1"},"hgnc":{"alias_symbol":["HuR","Hua","MelG"],"prev_symbol":["HUR"]},"alphafold":{"accession":"Q15717","domains":[{"cath_id":"3.30.70.330","chopping":"20-94","consensus_level":"high","plddt":93.3759,"start":20,"end":94},{"cath_id":"3.30.70.330","chopping":"106-182","consensus_level":"high","plddt":91.0847,"start":106,"end":182},{"cath_id":"3.30.70.330","chopping":"243-318","consensus_level":"high","plddt":91.2218,"start":243,"end":318}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15717","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15717-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15717-F1-predicted_aligned_error_v6.png","plddt_mean":79.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ELAVL1","jax_strain_url":"https://www.jax.org/strain/search?query=ELAVL1"},"sequence":{"accession":"Q15717","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15717.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15717/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15717"}},"corpus_meta":[{"pmid":"11289308","id":"PMC_11289308","title":"HuR and mRNA stability.","date":"2001","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/11289308","citation_count":957,"is_preprint":false},{"pmid":"31438961","id":"PMC_31438961","title":"WTAP facilitates progression of hepatocellular carcinoma via m6A-HuR-dependent epigenetic silencing of ETS1.","date":"2019","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/31438961","citation_count":529,"is_preprint":false},{"pmid":"10811625","id":"PMC_10811625","title":"HuR regulates cyclin A and cyclin B1 mRNA stability during cell proliferation.","date":"2000","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/10811625","citation_count":404,"is_preprint":false},{"pmid":"30081711","id":"PMC_30081711","title":"Activation of ferritinophagy is required for the RNA-binding protein ELAVL1/HuR to regulate ferroptosis in hepatic stellate cells.","date":"2018","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/30081711","citation_count":394,"is_preprint":false},{"pmid":"21935886","id":"PMC_21935886","title":"Posttranscriptional regulation of cancer traits by HuR.","date":"2010","source":"Wiley interdisciplinary reviews. 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Newly identified protein ligands to HuR modulate its function in normal and stressed cells.\",\n      \"method\": \"RNA-binding assays, overexpression in cultured cells, review of experimental literature\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — foundational finding replicated across multiple labs and studies; reviewed evidence from many orthogonal approaches\",\n      \"pmids\": [\"11289308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"HuR directly binds the 3'-UTRs of cyclin A and cyclin B1 mRNAs in a cell cycle-dependent manner, stabilizing these transcripts during S and G2 phases and thereby promoting cell proliferation. HuR translocates from the nucleus to the cytoplasm during late G1, S, and G2 phases.\",\n      \"method\": \"Gel-shift assays with radiolabeled RNA, anti-HuR supershift assays, antisense HuR knockdown, mRNA half-life measurement, cell cycle synchronization\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct RNA binding demonstrated by gel-shift and supershift, functional consequence validated by mRNA half-life in knockdown cells\",\n      \"pmids\": [\"10811625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"AMP-activated kinase (AMPK) regulates the level of cytoplasmic HuR: AMPK inhibition increases cytoplasmic HuR and enhances HuR binding to p21, cyclin B1, and cyclin A mRNAs, elevating their expression; AMPK activation reduces cytoplasmic HuR and decreases target mRNA stability.\",\n      \"method\": \"Dominant-negative and constitutively active AMPK adenovirus infection, cytoplasmic fractionation, RNA-protein binding assays, mRNA half-life measurement\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic and pharmacological perturbations of AMPK in same study with consistent results; functional readout via mRNA binding and stability\",\n      \"pmids\": [\"11971974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"HuR binds to three specific sites in the 3'-UTR of COX-2 mRNA and stabilizes it post-transcriptionally. HuR knockdown by RNAi or antisense attenuated serum withdrawal-induced COX-2 mRNA and protein accumulation.\",\n      \"method\": \"RNA immunoprecipitation from cell extracts, RNAi and antisense knockdown, mRNA level quantification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding sites mapped, functional validation by two independent knockdown methods\",\n      \"pmids\": [\"12704185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"HuR regulates beta-catenin mRNA in colon carcinoma cells; HuR overexpression increases tumor growth in vivo, while HuR knockdown (siRNA or antisense) slows growth, establishing HuR as a positive regulator of colon carcinogenesis through target mRNA stabilization.\",\n      \"method\": \"Immunohistochemistry, gene expression profiling, RNAi/antisense knockdown, xenograft tumor model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — beta-catenin mRNA identified as target, in vivo validation, but molecular mechanism of stabilization not deeply dissected in this paper\",\n      \"pmids\": [\"14562043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HuR promotes cell survival by binding and stabilizing/enhancing translation of mRNAs encoding anti-apoptotic proteins including ProTα, SIRT1, Bcl-2, and Mcl-1, orchestrating a broad anti-apoptotic gene expression program.\",\n      \"method\": \"RNA immunoprecipitation, translation assays, mRNA stability assays reviewed from multiple studies\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple target mRNAs demonstrated by RNA-IP and functional assays across studies reviewed; individual experiments documented\",\n      \"pmids\": [\"17534146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Phosphorylation of HuR at serine 242 inhibits its cytoplasmic localization and mRNA-stabilizing function. The non-phosphorylatable S242A mutant accumulates in the cytoplasm, shows increased association with cyclin A2 and B1 mRNAs, stabilizes these mRNAs, and heightens cell proliferation. The phosphomimetic S242D mutant remains nuclear under all conditions.\",\n      \"method\": \"Site-directed mutagenesis of HuR hinge region, subcellular fractionation, RNA immunoprecipitation, mRNA half-life assay, cell proliferation assay\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with localization, RNA binding, mRNA stability, and proliferation readouts in one study\",\n      \"pmids\": [\"18948743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"miR-519 represses HuR translation by interacting with its coding region and 3'-UTR, reducing HuR protein abundance without altering HuR mRNA levels, and consequently decreasing HuR-regulated target mRNA levels and cell proliferation.\",\n      \"method\": \"miR-519 precursor/antisense overexpression, reporter constructs with HuR coding region or 3'-UTR, polysome profiling, [3H]-thymidine incorporation, RNAi rescue experiments\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods including polysome profiling, reporter assays, and RNAi rescue; consistent findings\",\n      \"pmids\": [\"19088191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HuR binds to the 3'-UTR of DNMT3b mRNA, stabilizing it and increasing DNMT3b expression. Cisplatin treatment dissociates the HuR-DNMT3b mRNA complex, promoting DNMT3b mRNA decay, reducing DNMT3b protein, and lowering global DNA methylation.\",\n      \"method\": \"Ribonucleoprotein immunoprecipitation followed by RT-qPCR, biotinylated RNA pulldown with western blot, mRNA decay assay, methylation analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal pulldown and IP, mRNA stability assay, and functional methylation readout in one study\",\n      \"pmids\": [\"19270063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Genetic ablation of HuR causes embryonic lethality at midgestation due to placental labyrinth defects; conditional deletion in embryonic cells reveals HuR controls posttranscriptional regulation of transcription and growth factor mRNAs guiding placental morphogenesis, skeletal specification, and splenic ontogeny.\",\n      \"method\": \"Conditional knockout mice (embryonic and endothelial compartments), gene expression analysis, HuR-RNA association assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous genetic model with conditional tissue-specific ablation and RNA-binding evidence; phenotype definitively linked to HuR loss\",\n      \"pmids\": [\"19307312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HuR promotes XIAP translation via the IRES element in XIAP mRNA 5'-UTR: HuR binds XIAP IRES in vitro and in vivo and stimulates recruitment of XIAP mRNA into polysomes, contributing to HuR-mediated cytoprotection from apoptosis.\",\n      \"method\": \"UV cross-linking, RNA immunoprecipitation, polysome profiling, IRES-reporter assay, etoposide-apoptosis rescue experiment\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro and in vivo binding, polysome profiling, and functional rescue experiment\",\n      \"pmids\": [\"21102524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Methylated HuR (methyl-HuR) acts as an inhibitor of MAT2A mRNA stability, whereas non-methylated HuR promotes MAT2A mRNA stability. S-adenosylmethionine shifts the balance between methyl-HuR and HuR, regulating hepatic differentiation-dependent MAT expression.\",\n      \"method\": \"RNA immunoprecipitation, mRNA stability assays, immunofluorescence, manipulation of SAM levels in hepatic cell models\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct demonstration of differential effects of methylated vs. non-methylated HuR on MAT2A mRNA; single lab but multiple methods\",\n      \"pmids\": [\"20102719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PKCβ phosphorylates/activates HuR in the retina under diabetic conditions, leading to HuR binding to VEGF mRNA and elevated VEGF protein expression; PKCβ inhibition blocks this pathway.\",\n      \"method\": \"Immunoprecipitation coupled to RT-PCR for RNP complexes, PKCβ inhibitor treatment in diabetic rat model, western blot for HuR phosphorylation\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — demonstrated HuR phosphorylation by PKCβ and binding to VEGF mRNA in vivo in rat model with pharmacological intervention\",\n      \"pmids\": [\"20599775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Targeted deletion of HuR in germ cells causes male sterility due to spermatocyte death at meiosis and spermatid elongation failure. HuR specifically binds Hspa2 mRNA and controls its expression at the translational level in germ cells.\",\n      \"method\": \"Conditional germ cell-specific knockout mice, target gene approach, RNA binding assay, translational regulation analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic evidence from conditional KO model with defined cellular phenotype; Hspa2 established as translational target by RNA binding and expression analysis\",\n      \"pmids\": [\"21737689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HuR interacts with nucleolin mRNA 3'-UTR and promotes nucleolin translation without affecting mRNA levels; loss of HuR mobilizes nucleolin mRNA to processing bodies (PBs). HuR and miR-494 competitively regulate nucleolin expression, and HuR-driven cell proliferation is partly mediated through increased nucleolin expression.\",\n      \"method\": \"RIP, MS2-tagged RNA tracking to PBs, miRNA immunoprecipitation with Argonaute, reporter assay, HuR/miR-494 competitive overexpression/knockdown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods including tagged RNA localization, Ago-IP, and functional competition assay\",\n      \"pmids\": [\"21859890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HuR binds lncRNA RMRP in the nucleus and mediates its CRM1-dependent export to the cytoplasm. After RMRP import into mitochondria, GRSF1 binds RMRP and maintains its mitochondrial abundance, supporting oxygen consumption and mitochondrial DNA replication priming.\",\n      \"method\": \"Affinity RNA pulldown with mass spectrometry, RNA immunoprecipitation, CRM1 inhibition, mitochondrial fractionation, oxygen consumption rate measurement\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mass spectrometry identification confirmed by RIP, pharmacological inhibition of export, and organelle fractionation with functional readout\",\n      \"pmids\": [\"27198227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"lncRNA OIP5-AS1 (cyrano) acts as a sponge/ceRNA for HuR: high OIP5-AS1 sequesters HuR away from its target mRNAs, preventing HuR-mediated proliferative mRNA stabilization, while HuR stabilizes OIP5-AS1. miR-424 competes with HuR for binding to OIP5-AS1.\",\n      \"method\": \"MS2-hairpin RNA tagging and pulldown, miRNA/HuR competition assay, RNA immunoprecipitation, cell proliferation assays with OIP5-AS1 modulation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA pulldown and RIP demonstrate competing interactions; functional sponge effect on HuR-target mRNAs shown; single lab\",\n      \"pmids\": [\"26819413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HuR controls the expression of multiple nuclear import machinery components, and is required for nuclear import of CRABP2 (via classical-like NLS) and heregulin-induced nuclear translocation of NFκB p65, thereby regulating transcriptional activities of RAR and NFκB.\",\n      \"method\": \"HuR knockdown, subcellular localization assays, nuclear import assays, transcriptional reporter assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined molecular readout on nuclear import; single lab\",\n      \"pmids\": [\"27609837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The natural product dihydrotanshinone-I (DHTS) binds to residues within HuR RRM1 and RRM2 domains (identified by NMR titration and molecular dynamics), stabilizing HuR in a locked conformation that competitively inhibits RNA binding. In cells, DHTS preferentially displaces HuR from mRNAs with short 3'-UTRs or lower ARE density.\",\n      \"method\": \"NMR titration, molecular dynamics simulation, RNA electrophoretic mobility shift assay, AlphaScreen binding assay, RIP-chip transcriptome-wide analysis, xenograft model\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural data combined with in vitro binding assays and transcriptome-wide RIP in cells; mechanism of competitive inhibition mapped to specific residues\",\n      \"pmids\": [\"28934484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HuR promotes ferroptosis in hepatic stellate cells by binding AU-rich elements in the 3'-UTR of BECN1 (Beclin1) mRNA, stabilizing it and activating autophagy/ferritinophagy. ELAVL1 expression is induced by inhibition of ubiquitin-proteasome pathway during ferroptosis induction.\",\n      \"method\": \"siRNA/plasmid manipulation of ELAVL1, BECN1 3'-UTR deletion analysis, RIP assay, autophagy flux assays, mouse model of liver fibrosis with HSC-specific ELAVL1 knockdown\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct RNA binding to BECN1 3'-UTR F3 region confirmed by RIP and deletion analysis; in vivo validation in mouse model; multiple orthogonal methods\",\n      \"pmids\": [\"30081711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HuR comprises three RNA recognition motifs (RRMs); RRM3 mediates canonical RNA binding AND a dimerization interface on its α-helical face. Full-length HuR adopts a compact conformation upon RNA binding (free protein is flexible by NMR/SAXS). RRM3 dimerization and RNA binding are both required for HuR functional activity in vitro and in cells.\",\n      \"method\": \"Crystal structures of RRM3 free and RNA-bound, NMR, SAXS, biochemical binding assays, RRM3 mutagenesis, target mRNA level assays in human cells\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures combined with NMR, SAXS, biochemical and cellular mutagenesis; multiple orthogonal structural and functional methods\",\n      \"pmids\": [\"30418581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HuR binds the 3'-UTR of TIN2 mRNA, destabilizing TIN2 mRNA and reducing its translation. Loss of HuR during replicative senescence increases TIN2 expression, enhancing mitochondrial TIN2 localization and ROS production, thereby promoting cellular senescence.\",\n      \"method\": \"RIP, mRNA stability assay, HuR knockdown/overexpression, mitochondrial fractionation, ROS measurement\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding demonstrated by RIP; negative regulatory function on TIN2 mRNA shown by stability and translation assays; functional consequence through mitochondrial pathway\",\n      \"pmids\": [\"29584879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HuR binds TERC RNA and promotes TERC C106 methylation, facilitating TERC/TERT complex assembly and telomerase activity. Dyskeratosis congenita-related TERC mutations (U100A, G107U, GC107/108AG) impair HuR binding, reducing C106 methylation, decreasing telomerase activity, and causing telomere shortening and hematopoietic stem cell renewal defects.\",\n      \"method\": \"RNA immunoprecipitation, methylation assays, TERC mutation analysis, HuR knockout mice (hematopoietic stem cells), telomerase activity assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — novel function demonstrated by RIP, biochemical methylation assays, DC-related mutations, and in vivo HSC phenotype\",\n      \"pmids\": [\"29880812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HuR binds MEF2C mRNA and protects it from degradation, increasing MEF2C levels which in turn transcriptionally enhance SCN5A expression. HuR overexpression increased SCN5A mRNA, an effect attenuated by MEF2C siRNA.\",\n      \"method\": \"RNP immunoprecipitation (RIP), mRNA stability assay, ChIP-qPCR, EMSA, MEF2C siRNA rescue experiment\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP confirms HuR-MEF2C mRNA binding; ChIP and EMSA establish MEF2C-SCN5A link; rescue experiment validates pathway; single lab\",\n      \"pmids\": [\"29678826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Adipose-specific HuR knockout mice show obesity and metabolic dysfunction. HuR positively regulates ATGL (adipose triglyceride lipase) expression by promoting both mRNA stability and translation of ATGL, thereby controlling lipolysis.\",\n      \"method\": \"Adipose-specific HuR KO mice, mRNA stability assay, translation assay, RIP\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO model, direct RNA binding confirmed by RIP, and multiple functional readouts (mRNA stability and translation)\",\n      \"pmids\": [\"31147543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HuR forms complexes with NAFLD-relevant transcripts: it associates with intron 24 of Apob pre-mRNA to regulate alternative splicing, with the 3'-UTR of Uqcrb to regulate translation, and with the 5'-UTR of Ndufb6 mRNA to regulate NDUFB6 translation. Hepatocyte-specific HuR KO reduces APOB, UQCRB, and NDUFB6 expression, impairing lipid transport and ATP synthesis.\",\n      \"method\": \"RNA immunoprecipitation, hepatocyte-specific KO mice, adenovirus re-expression rescue, mRNA splicing analysis, translation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO with adenoviral rescue, RIP confirmation of binding to distinct RNA elements with distinct functional outcomes (splicing vs. translation)\",\n      \"pmids\": [\"32546794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HuR stabilizes PLB (phospholamban) mRNA and destabilizes β1-AR mRNA in cardiomyocytes. Cardiomyocyte-specific HuR deletion mitigates isoproterenol-induced PLB expression, aggravating myocardial hypertrophy.\",\n      \"method\": \"Cardiomyocyte-specific HuR KO mouse, RIP assay for PLB and β1-AR mRNAs, mRNA stability assays\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO model with direct RNA binding confirmation by RIP; opposite regulatory effects on two target mRNAs shown\",\n      \"pmids\": [\"31373621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Fat-specific knockout of HuR enhances adipogenic gene programs and causes depot-specific phenotypes, including repression of myogenesis in brown fat, enhanced inflammation in epididymal white fat, and induction of browning in inguinal white fat. HuR inhibits adipogenesis at least partly by modulating stability of Insig1 mRNA.\",\n      \"method\": \"Fat-specific HuR KO mice, RNA-seq, mRNA stability assays, in vitro adipogenesis assays with HuR knockdown/overexpression\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO with RNA-seq and defined molecular mechanism (Insig1 mRNA stability); multiple orthogonal approaches\",\n      \"pmids\": [\"31924774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HuR suppresses Fas (death receptor) mRNA translation by binding to two AU-rich domains in the Fas mRNA 3'-UTR, preventing Fas-mediated apoptosis in hepatocellular carcinoma cells. Hydrodynamic transfection of HuR plasmid in mice induced Fas downregulation and resistance to Fas agonist.\",\n      \"method\": \"RIP, 3'-UTR reporter assay, HuR silencing and Fas protein/surface expression assays, in vivo hydrodynamic transfection\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — binding sites mapped, translational repression confirmed by reporter assay; in vivo validation; direct mechanistic link established\",\n      \"pmids\": [\"25678597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HuR/ELAVL1 is the predominant RNA-binding protein associating with the IFN-β mRNA ARE; reduced HuR expression or chemical inhibition severely impairs the type I IFN response in multiple cell types, demonstrating HuR as a key potentiator of innate antiviral signaling through IFN-β mRNA stabilization.\",\n      \"method\": \"Affinity proteomic pulldown of IFN-β ARE with mass spectrometry, HuR knockdown, chemical inhibition, type I IFN response measurement in fibroblast-like synoviocytes\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry-identified binding confirmed by functional knockdown/inhibition; physiologically relevant cell types tested\",\n      \"pmids\": [\"25678110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ECRG2 tumor suppressor negatively regulates HuR by promoting its ubiquitination and proteasomal degradation; ECRG2 expression reduces XIAP mRNA stability through HuR, inducing apoptosis. Cancer-derived ECRG2 V30E mutant fails to degrade HuR or suppress XIAP.\",\n      \"method\": \"Ubiquitination assay, HuR stability measurement, XIAP mRNA stability assay, caspase activation, mutant analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination of HuR shown by ECRG2; mechanistic link through XIAP mRNA; cancer mutant validation; single lab\",\n      \"pmids\": [\"26434587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In myogenesis, HuR must translocate to the cytoplasm to stabilize myogenic factor mRNAs; cytoplasmic HuR accumulation requires its dissociation from the nuclear import factor Transportin 2 (TRN2), triggered by proteolytic cleavage of a portion of cytoplasmic HuR.\",\n      \"method\": \"Review of experimental findings from the same group: cleavage assays, Transportin-2 interaction assays, myogenesis models\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic details of TRN2 dissociation and HuR cleavage described from experimental work; review paper summarizing prior experimental findings\",\n      \"pmids\": [\"21315776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HuR binds the 3'-UTR of ABCA1 mRNA and promotes ABCA1 translation, increasing cholesterol efflux. Cholesterol levels regulate HuR expression, localization, and its interaction with ABCA1 mRNA.\",\n      \"method\": \"RNA immunoprecipitation, HuR knockdown, cholesterol efflux assay, cell fractionation\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP confirms direct binding; functional cholesterol efflux assay validates biological relevance; single lab\",\n      \"pmids\": [\"24729624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HSF1 regulates β-catenin expression at the translational level by controlling HuR levels; HuR in turn controls β-catenin translation. mTOR phosphorylation of HSF1 at S326 promotes β-catenin expression through a mechanism requiring HuR.\",\n      \"method\": \"HSF1 gain/loss-of-function, HuR level quantification, translation assays, mTOR knockdown with HuR-dependent rescue\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established (mTOR → HSF1 → HuR → β-catenin translation); mTOR knockdown rescue experiment; single lab\",\n      \"pmids\": [\"24954509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HuR binds the 3'-UTR of BECN1 mRNA via the F3 AU-rich region, stabilizing it and activating autophagy. Internal deletion of the F3 region abrogated HuR-mediated BECN1 mRNA stability and ferroptosis.\",\n      \"method\": \"RIP assay, BECN1 3'-UTR deletion constructs, mRNA stability assay, autophagy flux monitoring\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RIP binding, fine-mapped to F3 deletion; functional consequence on autophagy validated\",\n      \"pmids\": [\"30081711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HuR regulates glutaminase (GLS) mRNA alternative splicing and isoform translation/stability in breast cancer. ELAVL1 knockdown reduces KGA isoform and increases GAC levels, enhancing glutamine anaplerosis into the TCA cycle. Combining GLS chemical inhibition with ELAVL1 silencing synergistically decreases breast cancer cell growth.\",\n      \"method\": \"ELAVL1 knockdown, isoform quantification by RT-PCR, metabolic flux analysis (glutamine anaplerosis), cell viability assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — alternative splicing and metabolic flux measured after ELAVL1 knockdown; multiple orthogonal functional readouts; novel dual function (splicing and translation/stability)\",\n      \"pmids\": [\"38965208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HuR is required for maintenance of cranial neural crest specification by stabilizing Draxin mRNA; Elavl1 perturbation reduces Draxin mRNA levels and causes premature neural crest delamination, and exogenous Draxin rescues the specification defects.\",\n      \"method\": \"siRNA/antisense perturbation in chick embryos, RNA-seq, RIP, RNA decay measurement, proximity ligation assay, rescue with exogenous Draxin\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RIP, RNA decay, RNA-seq, proximity ligation) plus rescue experiment identifying Draxin as primary stabilization target\",\n      \"pmids\": [\"36189921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HuR binds HuR (ELAVL1) mRNA 3'-UTR and upregulates TRIM21 translation, while TRIM21 degrades HuR protein in response to UV radiation, constituting a negative feedback loop that regulates p53 levels in genotoxic stress.\",\n      \"method\": \"RIP showing HuR binding to TRIM21 mRNA 3'-UTR, TRIM21 ubiquitination of HuR assay, cell proliferation/colony formation, DHTS inhibitor treatment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and functional assays demonstrate feedback loop; single lab, single paper\",\n      \"pmids\": [\"32678213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PLK1 phosphorylates and modulates ELAVL1/HuR availability; HuR in turn binds to the 3'-end of miR-122, promoting its biogenesis and consequently HCV proliferation. PLK1 inhibition by rigosertib reduces HuR-miR-122 signaling and HCV replication.\",\n      \"method\": \"Kinase inhibitor library screening, rescue experiments with HuR overexpression/knockdown, HCV mutant with low miR-122 dependency, replicon and infectious cell models, in vivo replicon-harboring mice\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple rescue experiments and HCV mutant validation; in vivo confirmation; novel function of HuR in miRNA biogenesis established\",\n      \"pmids\": [\"36512502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HuR binds to AMPKα1 and AMPKα2 mRNAs in smooth muscle cells, increasing their stability and translation; smooth muscle-specific HuR KO reduces p-AMPK and LC3II while increasing p62, causing defective autophagy and enhanced atherosclerosis.\",\n      \"method\": \"Smooth muscle-specific HuR KO mice, RNA immunoprecipitation, mRNA stability assay, autophagy markers, atherosclerosis model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with RIP confirming binding; functional pathway (HuR→AMPK→autophagy) validated by pharmacological AMPK activation rescue\",\n      \"pmids\": [\"33837179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LINC00941 forms an RNA-protein complex with ELAVL1/HuR to inhibit autophagosome-lysosome fusion. The LINC00941-ELAVL1 complex controls stability of EZH2, STAT1, and FOXK1 mRNAs, thereby blocking autophagy and promoting pulmonary fibrosis.\",\n      \"method\": \"RNA affinity isolation, RIP, RNase-RIP, half-life analysis, ubiquitination experiments, autophagic flux monitoring, RIP-seq, rescue experiments\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays and RIP-seq identify complex and target mRNAs; single lab but several orthogonal methods\",\n      \"pmids\": [\"35427207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"WTAP-mediated m6A modification of ETS1 mRNA leads to its post-transcriptional suppression; HuR is implicated as an RNA stabilizer in this pathway. m6A modification reduces ETS1 mRNA stability in an HuR-dependent manner in HCC.\",\n      \"method\": \"MeRIP assay, RIP assay, dual luciferase reporter, m6A dot blot, ChIP\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — RIP demonstrates HuR binding but the mechanism of how m6A affects HuR-ETS1 mRNA interaction is not deeply characterized; single lab\",\n      \"pmids\": [\"31438961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HuR binds Cx40 mRNA in cardiac endothelial cells and stabilizes it; HuR deficiency in diabetic mice reduces Cx40 expression, contributing to coronary microvascular dysfunction. Endothelial-specific HuR-KO mice display decreased coronary flow velocity reserve and capillary density.\",\n      \"method\": \"Endothelial-specific HuR KO mice, RIP showing HuR-Cx40 mRNA binding, coronary flow velocity reserve measurement, capillary density quantification, Cx40-KO mice comparison\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO, direct RIP evidence, and Cx40-KO phenocopy provide mechanistic pathway\",\n      \"pmids\": [\"34747371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HuR stabilization function during T cell activation is temporally regulated: HuR-dependent robust mRNA stabilization occurs at 4 h post-activation, coordinating stabilization of functionally related mRNA subpopulations (replicative histones, ribosomal biogenesis, cell motility), demonstrated by integrating PAR-CLIP binding data with metabolic labeling-based mRNA stability measurements.\",\n      \"method\": \"Metabolic mRNA labeling for transcription and decay rates, PAR-CLIP data integration, Jurkat T cell activation time course\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — novel analytical integration of genome-wide binding and stability data; single lab but orthogonal methods (metabolic labeling + CLIP)\",\n      \"pmids\": [\"26490963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HuR-mediated cytoplasmic translocation of HOTAIR lncRNA promotes osteoblast function: HuR is responsible for HOTAIR nucleocytoplasmic translocation during BMSC osteogenic differentiation; cytoplasmic HOTAIR acts as ceRNA for miR-214 to increase Atf4 expression.\",\n      \"method\": \"BMSC/osteoblast localization studies, HuR RIP, HuR knockdown/overexpression, transgenic mice (Prx1- and Bglap-HOTAIR), ceRNA assay\",\n      \"journal\": \"Bone research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP confirms HuR-HOTAIR binding; functional consequence on nucleocytoplasmic translocation demonstrated; in vivo validation in transgenic mice\",\n      \"pmids\": [\"37872163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HuR promotes SOD2 mRNA translation specifically upon anchorage-independence; HuR translocates to the cytosol in response to matrix detachment (promoted by p38 MAPK activation), binds SOD2 mRNA, and increases its association with heavy polysomes for nascent protein synthesis.\",\n      \"method\": \"HuR siRNA knockdown, polyribosome profiling, RIP assay, p38 MAPK inhibition, nascent protein synthesis measurement\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — polysome profiling and RIP confirm translational mechanism; p38 requirement for HuR-SOD2 interaction demonstrated; multiple methods\",\n      \"pmids\": [\"35594792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HuR stabilizes HuR (ELAVL1) mRNA/binds HuR target mRNAs in neurons; neuron-specific HuR deficiency leads to motor neuron disease phenotype with apoptosis of pyramidal neurons and α motor neurons, TDP43 redistribution to cytosolic granules, and altered expression of HuR-regulated genes including SOD1 and Bcl2 in the brain.\",\n      \"method\": \"Inducible neuron-specific HuR KO mice, immunostaining for cleaved caspase-3, genome-wide microarray, rotarod and grip-strength tests, TDP43 localization assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined cellular phenotype (motor neuron apoptosis, TDP43 redistribution); genome-wide target analysis; single lab\",\n      \"pmids\": [\"29760195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Let-7 mimic (ssDNA complementary to let-7 binding site) enhances the affinity of HuR for a 122-nt MYC RNA containing both HuR and let-7 binding sites, demonstrating cooperative biophysical binding between HuR and a miRNA at distal mRNA binding sites.\",\n      \"method\": \"In vitro RNA binding affinity assays with let-7 mimic and recombinant HuR on MYC RNA\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — reconstituted in vitro cooperative binding demonstrated but single lab, single biochemical method\",\n      \"pmids\": [\"26177105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A single-domain antibody (VHH) binding HuR with low nanomolar affinity inhibits HuR-RNA binding; engineering this VHH into a TRIM21-based bioPROTAC degrades endogenous HuR, reversing tumor-promoting properties of cancer cells in vivo by altering the HuR-regulated proteome.\",\n      \"method\": \"VHH antibody selection and characterization, HuR-RNA binding inhibition assay, bioPROTAC engineering, in vivo xenograft degradation and proteome analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — demonstrates direct inhibition of HuR-RNA binding by VHH, functional HuR degradation in vivo with proteome-level readout; multiple methods\",\n      \"pmids\": [\"37925433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HuR binds to and stabilizes EZH2, STAT1, and FOXK1 mRNAs when complexed with LINC00941, preventing autophagosome-lysosome fusion; this is demonstrated by ELAVL1 RIP-seq, RIP-PCR, and mRNA stability measurements.\",\n      \"method\": \"ELAVL1 RIP-seq, RIP-PCR, mRNA stability assay, rescue experiments\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq and mRNA stability confirm binding and stabilization; rescue experiments link complex to autophagy inhibition; single lab\",\n      \"pmids\": [\"35427207\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ELAVL1/HuR is a ubiquitously expressed RNA-binding protein that recognizes AU-rich elements (AREs) in target mRNAs through its three RNA recognition motifs (RRM1/2 for primary binding; RRM3 for additional RNA contacts and RRM3-mediated dimerization required for full function), and post-transcriptionally regulates mRNA stability, translation, splicing, and nucleo-cytoplasmic export of bound transcripts; HuR is predominantly nuclear but translocates to the cytoplasm in response to stress, proliferative, and metabolic signals—regulated in part by phosphorylation (e.g., at S242 by Cdk1, which retains HuR in the nucleus; PKCβ-mediated phosphorylation activates it) and by AMPK-dependent mechanisms—where it stabilizes and/or promotes translation of target mRNAs encoding proteins involved in cell proliferation (cyclins A/B1), survival (Bcl-2, Mcl-1, XIAP, ProTα), metabolism (ATGL, APOB, GLS isoforms), differentiation, and immune signaling (IFN-β, COX-2, IL-8), while also mediating novel functions including TERC methylation to support telomerase assembly, lncRNA nuclear export (RMRP via CRM1), and regulation of alternative splicing; its availability is controlled by miRNAs (e.g., miR-519 suppresses HuR translation) and lncRNA/circRNA sponges (OIP5-AS1, circDDIT4), and HuR activity is subject to negative regulation by ubiquitin-mediated degradation (via TRIM21/ECRG2) and by posttranslational methylation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ELAVL1/HuR is a ubiquitously expressed RNA-binding protein that post-transcriptionally controls gene expression by selectively binding AU-rich elements (AREs) in target mRNA 3'-UTRs and antagonizing ARE-mediated decay to stabilize transcripts [#0, #1]. Structurally it uses three RNA recognition motifs, with RRM3 contributing both RNA contacts and a dimerization interface; RNA binding drives the flexible apo-protein into a compact conformation, and both RRM3 dimerization and RNA binding are required for full activity [#20]. Through these activities HuR governs proliferation by stabilizing cyclin A and cyclin B1 mRNAs in a cell cycle-dependent manner [#1], and orchestrates a broad pro-survival program by stabilizing or enhancing translation of anti-apoptotic mRNAs (ProTα, SIRT1, Bcl-2, Mcl-1, XIAP) [#5, #10] while repressing pro-death targets such as Fas [#28]. Beyond mRNA stability, HuR regulates cap-independent translation via IRES (XIAP) [#10], alternative splicing and isoform selection (Apob pre-mRNA, glutaminase GLS) [#25, #35], and nucleo-cytoplasmic export of lncRNAs (RMRP via CRM1, HOTAIR) [#15, #44], and supports telomerase assembly by binding TERC RNA and promoting C106 methylation [#22]. HuR is predominantly nuclear but translocates to the cytoplasm in response to proliferative, stress, and metabolic cues; this shuttling is governed by phosphorylation—Cdk1-type phosphorylation at S242 retains HuR in the nucleus and limits target binding [#6], while PKCβ and p38 MAPK signaling promote its cytoplasmic activity [#12, #45]—and by AMPK-dependent control of cytoplasmic HuR levels [#2]. In vivo, conditional and tissue-specific knockouts establish essential roles in placental and embryonic development [#9], spermatogenesis [#13], adipose lipolysis and adipogenesis [#24, #27], hepatic lipid metabolism [#25], and cardiac and vascular function [#26, #42]. HuR abundance and activity are themselves tightly regulated: miR-519 represses its translation [#7], lncRNA/ceRNA sponges such as OIP5-AS1 sequester it [#16], and TRIM21- and ECRG2-driven ubiquitination targets it for proteasomal degradation [#30, #37].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that HuR is a sequence-specific ARE-binding protein that physically stabilizes target mRNAs, defining its core molecular activity and linking it to cell cycle progression.\",\n      \"evidence\": \"Gel-shift/supershift assays, antisense knockdown, and mRNA half-life measurement on cyclin A and B1 in synchronized cells\",\n      \"pmids\": [\"10811625\", \"11289308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how nuclear HuR reaches cytoplasmic targets\", \"Mechanism of decay antagonism at the molecular level not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed that metabolic signaling through AMPK sets the level of cytoplasmic HuR, connecting energy status to ARE-mRNA stabilization.\",\n      \"evidence\": \"Dominant-negative/constitutively active AMPK adenovirus, cytoplasmic fractionation, RNA binding and half-life assays\",\n      \"pmids\": [\"11971974\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs. indirect AMPK effect on HuR not distinguished\", \"No phosphosite mapping in this study\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Extended HuR target repertoire to inflammatory (COX-2) and oncogenic (beta-catenin) transcripts and provided in vivo evidence for a pro-tumorigenic role.\",\n      \"evidence\": \"RNA immunoprecipitation, RNAi/antisense knockdown, expression profiling, and xenograft tumor models\",\n      \"pmids\": [\"12704185\", \"14562043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"beta-catenin stabilization mechanism not deeply dissected\", \"Upstream signals controlling target selectivity unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Consolidated HuR as a master regulator of an anti-apoptotic program acting through both mRNA stabilization and translational enhancement.\",\n      \"evidence\": \"Review integrating RNA-IP, translation, and stability assays for ProTα, SIRT1, Bcl-2, Mcl-1\",\n      \"pmids\": [\"17534146\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of stability vs. translation per target not quantified\", \"Compiled from multiple studies rather than one reconstituted system\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified phosphorylation as the switch controlling HuR localization and activity, showing S242 phosphorylation enforces nuclear retention and dampens target binding/proliferation.\",\n      \"evidence\": \"S242A/S242D mutagenesis with fractionation, RIP, mRNA half-life, and proliferation assays; plus miR-519 reporter, polysome, and rescue assays\",\n      \"pmids\": [\"18948743\", \"19088191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological kinase for S242 not definitively assigned in these studies\", \"How phosphorylation alters RNA affinity structurally unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Genetic ablation demonstrated that HuR is essential for development, with target mRNAs guiding placental, skeletal, and splenic morphogenesis, and expanded targets to the epigenetic enzyme DNMT3b.\",\n      \"evidence\": \"Conditional knockout mice with expression and HuR-RNA association assays; RNP-IP, biotin pulldown, and methylation analysis for DNMT3b\",\n      \"pmids\": [\"19307312\", \"19270063\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which target mRNAs are rate-limiting for each developmental phenotype not resolved\", \"Stress-induced complex dissociation mechanism (cisplatin) not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Broadened HuR's mechanistic scope to IRES-mediated translation (XIAP) and revealed that posttranslational methylation reverses its effect on a target (MAT2A), introducing PKCβ as an activating kinase.\",\n      \"evidence\": \"UV cross-linking, polysome profiling, IRES reporter, apoptosis rescue; RIP and SAM manipulation; RNP-IP with PKCβ inhibition in diabetic rat retina\",\n      \"pmids\": [\"21102524\", \"20102719\", \"20599775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Methyltransferase responsible for HuR methylation not identified here\", \"Structural basis for methylation-dependent functional reversal unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Tissue-specific knockout showed HuR controls translation of germ cell mRNAs (Hspa2) required for meiosis, and clarified translational regulation vs. P-body sequestration for nucleolin.\",\n      \"evidence\": \"Germ cell-specific KO mice with RNA binding/translation assays; RIP, MS2 RNA tracking to P-bodies, Ago-IP and miR-494 competition\",\n      \"pmids\": [\"21737689\", \"21859890\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How HuR selects translational vs. stability mode per target not defined\", \"Trigger for nucleolin mRNA mobilization to P-bodies upon HuR loss unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed non-canonical roles in lncRNA nuclear export (RMRP via CRM1) and showed that lncRNA sponges (OIP5-AS1) and nuclear import machinery couple HuR to broader RNA and protein trafficking.\",\n      \"evidence\": \"Affinity RNA pulldown-MS, RIP, CRM1 inhibition, mitochondrial fractionation; MS2 pulldown and competition assays; nuclear import and reporter assays\",\n      \"pmids\": [\"27198227\", \"26819413\", \"27609837\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How HuR is partitioned between export and stabilization functions unknown\", \"OIP5-AS1 sponge effect characterized in a single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Crystal/NMR/SAXS structural work defined RRM3 as both an RNA-contacting and dimerization module and established that RNA binding induces a compact conformation required for function.\",\n      \"evidence\": \"RRM3 crystal structures (free and RNA-bound), NMR, SAXS, mutagenesis, and target mRNA assays in cells\",\n      \"pmids\": [\"30418581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length multi-RRM/RNA complex structure not solved\", \"How dimerization tunes target selectivity in vivo not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"In vivo conditional knockouts across adipose, liver, and heart defined HuR as a metabolic and cardiovascular regulator acting through distinct RNA elements (splicing, 5'/3'-UTR translation, stability) on multiple targets.\",\n      \"evidence\": \"Tissue-specific KO mice (adipose, hepatocyte, cardiomyocyte, endothelial) with RIP, mRNA stability, translation, splicing, and physiological readouts\",\n      \"pmids\": [\"31147543\", \"31924774\", \"32546794\", \"31373621\", \"34747371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single protein achieves opposite effects (stabilize PLB vs destabilize β1-AR) on different targets unresolved\", \"Tissue-specific cofactors directing target choice not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined HuR roles in metabolic reprogramming (GLS splicing), miRNA biogenesis (miR-122), developmental specification (Draxin), and demonstrated druggability via small molecules, structural inhibitors, and bioPROTAC degraders.\",\n      \"evidence\": \"ELAVL1 knockdown with isoform/flux analysis; PLK1 axis and HCV models; chick embryo RIP/rescue; NMR-guided DHTS inhibitor and VHH-TRIM21 bioPROTAC with in vivo proteome readout\",\n      \"pmids\": [\"38965208\", \"36512502\", \"36189921\", \"28934484\", \"37925433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability of PLK1-HuR-miRNA axis beyond HCV unknown\", \"Selectivity of degrader and inhibitor across the full HuR target proteome not fully mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HuR integrates phosphorylation, methylation, ubiquitination, miRNA, and lncRNA inputs to select among stabilization, translational, splicing, and export outcomes on a per-target basis remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified code linking PTM state to functional outcome\", \"Determinants of opposite regulatory effects on distinct targets undefined\", \"Full-length protein-RNA complex structure and in-cell conformational states unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 3, 18, 20]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [10, 14, 24, 28, 45]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 5, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 6, 15, 17]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 2, 6, 31, 45]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 25, 35]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 2, 6]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5, 10, 28]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [19, 34, 39, 40]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [10, 14, 24, 45]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 13, 36]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TRIM21\", \"ECRG2\", \"OIP5-AS1\", \"LINC00941\", \"CRM1\", \"TRN2\", \"AMPK\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":7,"faith_total":7,"faith_pct":100.0}}