{"gene":"HNRNPD","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1993,"finding":"AUF1 (p37 and p40 isoforms) was purified from K562 cell postribosomal supernatant as the RNA-binding component of mRNA degradation activity; both polypeptides are phosphorylated, form complexes with other polypeptides, and are found in both nucleus and cytoplasm. cDNA cloning revealed two RNA recognition motifs (RRMs) and domains mediating protein-protein interactions.","method":"Biochemical purification, UV crosslinking, immunoprecipitation, cDNA cloning, immunoblot","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical purification with functional assay (cell-free mRNA decay), cDNA cloning confirming domain structure, replicated across multiple methods in the founding paper","pmids":["8246982"],"is_preprint":false},{"year":1997,"finding":"High-affinity AUF1 binding to AREs requires both RRMs plus an N-terminal alanine-rich region and a C-terminal glutamine-rich region. The N-terminus is required for dimerization, and AUF1 binds an ARE as a hexameric protein, indicating protein-protein interactions are essential for high-affinity ARE binding.","method":"In vitro RNA binding assays with AUF1 deletion mutants, gel mobility shift assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic deletion mutagenesis with in vitro binding assays; multiple orthogonal methods in a single rigorous study","pmids":["9346902"],"is_preprint":false},{"year":1998,"finding":"The four AUF1 isoforms (p37, p40, p42, p45) are generated by alternative pre-mRNA splicing of a single gene at chromosome 4q21.1-q21.2; the different isoforms exhibit different RNA-binding affinities and specificities.","method":"Genomic cloning, Southern blotting, FISH, RT-PCR, immunoblot","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct genomic sequencing combined with functional binding assays, replicated in multiple lines","pmids":["9521873"],"is_preprint":false},{"year":1999,"finding":"AUF1 assembles on U-rich ARE RNA by sequential dimer binding: AUF1 dimers cross-link to form tetramers on high-affinity RNA targets. Sequences C-terminal to the RRMs contribute to tetramer-ARE complex formation but are not required for RNA binding. ARE-AUF1 complexes are highly dynamic in solution.","method":"Gel mobility shift assay, chemical cross-linking, fluorescence anisotropy with fluorescent RNA substrates, deletion mutant analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal in vitro methods (cross-linking, fluorescence anisotropy, deletion mutants) in a single study","pmids":["10559216"],"is_preprint":false},{"year":1999,"finding":"AUF1 mRNA contains alternative 3'-UTR splice variants including a conserved 107-nt exon 9; inclusion of a spliceable intron 9 downstream of the stop codon triggers nonsense-mediated mRNA decay, providing a self-regulatory mechanism for AUF1 expression. Intronic AUF1-binding sequences in the unspliceable form also repress expression in cis.","method":"Luciferase-AUF1 3'UTR chimeric transcript reporter assays, deletion analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with deletion mutants, single lab, functional validation of regulatory mechanism","pmids":["10330146"],"is_preprint":false},{"year":2000,"finding":"SAF-B (scaffold attachment factor B), a nuclear matrix-associated protein, interacts specifically with the p42/p45 AUF1 isoforms via their C-terminal exon 7-encoded sequence. This interaction retains p42/p45 in the nucleus (nuclear retention activity mapped to exon 7 region), while p40/p37 undergo continuous nucleocytoplasmic shuttling. p45/p42 isoforms act as negative regulators of gene expression by forming a complex with SAF-B.","method":"Yeast two-hybrid screening, in vitro binding confirmation, heterokaryon shuttling assay, RNA Pol II inhibitor treatment, colocalization by immunofluorescence","journal":"Archives of biochemistry and biophysics","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid confirmed in vitro plus cellular localization experiments with multiple orthogonal methods","pmids":["10933876"],"is_preprint":false},{"year":2000,"finding":"AUF1 functions as the DNA-binding component CBF2 at the Epstein-Barr virus C promoter (Cp); AUF1 binds a specific sequence within the EBNA2 enhancer in Cp, and stimulation of the cAMP/PKA signaling pathway increases AUF1/CBF2 binding activity and enhances EBNA2-mediated transcriptional activation.","method":"Biochemical purification of CBF2, microsequencing, antibody supershift in EMSA, cAMP/PKA stimulation assays, transfection reporter assays","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct biochemical purification with peptide sequencing, EMSA supershift, and functional transcription assays","pmids":["10933728"],"is_preprint":false},{"year":2001,"finding":"AUF1 binding to ARE RNA induces condensation of the RNA into a compact structure distinct from the folded structure stabilized by multivalent cations (Mg2+). Mg2+-induced folding of the TNFα ARE inhibits AUF1 binding and oligomerization.","method":"Fluorescence resonance energy transfer (FRET), gel mobility shift assays, fluorescence anisotropy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro structural/biophysical analysis with multiple orthogonal approaches in a single study","pmids":["11514570"],"is_preprint":false},{"year":2001,"finding":"NMR structure of the C-terminal RBD (RBD2) of hnRNP D0/AUF1 reveals a five-stranded antiparallel beta-sheet packed against two alpha-helices; chemical shift perturbation showed that the beta4(-) to beta4 region contacts RNA (and DNA in essentially the same way). Slow conformational exchange in the beta4(-) to beta4 region of free RBD2 is quenched upon complex formation with DNA.","method":"NMR structure determination, relaxation/dynamics analysis, chemical shift perturbation mapping","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — full NMR structure with backbone dynamics analysis; single lab but multiple orthogonal NMR methods","pmids":["11531333"],"is_preprint":false},{"year":2002,"finding":"The p37 and p40 AUF1 isoforms are selectively ubiquitinated and degraded by the proteasome, whereas p42 and p45 are not. The C-terminal exon 7 sequence (present only in p42/p45) blocks ubiquitination; deletion of exon 7 permits ubiquitination and rapid degradation of normally stable AUF1 proteins.","method":"In vitro ubiquitination system, overexpression of ubiquitin-cycle enzymes, proteasome inhibitor assays, deletion mutagenesis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination reconstitution plus cellular validation with deletion mutants and multiple controls","pmids":["12136087"],"is_preprint":false},{"year":2003,"finding":"All four AUF1 isoforms undergo rapid, transcription-independent, carrier-mediated, energy-requiring nucleocytoplasmic shuttling. Nuclear import is mediated by a C-terminal signal found only in the two smaller isoforms (p37, p40); nuclear export is facilitated by exon 7 sequences found only in the two larger isoforms (p42, p45). A subset of AUF1 proteins directly interact in vitro and in vivo in the absence of RNA, forming heterocomplexes that may co-shuttle.","method":"Heterokaryon shuttling assay, GFP fusion reporter constructs, mutagenesis mapping, in vitro protein interaction with purified recombinant proteins, leptomycin B treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (heterokaryon assay, GFP reporters, mutagenesis, purified protein interactions) in a single study","pmids":["12668672"],"is_preprint":false},{"year":2003,"finding":"The p37 AUF1 isoform (and to a lesser extent p40) possesses ARE-mRNA destabilizing activity when overexpressed and is a limiting component for ARE-mRNA decay. p37 AUF1 overexpression restores rapid degradation of ARE-mRNAs in cells where this activity is saturated, and eliminates the translation-dependent step normally required for ARE-mRNA decay.","method":"Overexpression of individual AUF1 isoforms, mRNA half-life measurements, reporter mRNA assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct functional assays with isoform-specific overexpression and mRNA half-life measurements; replicated across multiple experiments","pmids":["12944492"],"is_preprint":false},{"year":2003,"finding":"AUF1 interacts with ubiquitin-conjugating enzyme E2I, and the RNA-binding proteins NSEP-1, NSAP-1, and IMP-2 in a yeast two-hybrid screen; all interactions were confirmed in vitro with purified proteins. NSEP-1 showed endoribonuclease activity in vitro. The interacting proteins can simultaneously bind an AU-rich RNA oligonucleotide with AUF1.","method":"Yeast two-hybrid, in vitro binding with recombinant proteins, domain mapping, gel-shift assays with recombinant proteins","journal":"Biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed in vitro with purified proteins, single lab","pmids":["12674497"],"is_preprint":false},{"year":2004,"finding":"HuR and AUF1 can bind common target mRNAs (p21, cyclin D1) on both distinct nonoverlapping sites and on common sites in a competitive fashion. In the nucleus, both proteins are found together in stable ribonucleoprotein complexes; in the cytoplasm, HuR colocalizes with the translational apparatus and AUF1 colocalizes with the exosome.","method":"RNP immunoprecipitation, UV crosslinking, sucrose gradient fractionation, immunofluorescence colocalization","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RIP, UV-crosslink, fractionation, colocalization) across multiple target mRNAs, single lab","pmids":["15257295"],"is_preprint":false},{"year":2006,"finding":"All four AUF1 isoforms bind directly to translation initiation factor eIF4G at its C-terminal site, independently of ARE binding. AUF1 also directly interacts with poly(A)-binding protein (PABP) both independently of and in complex with eIF4G; AUF1-PABP interaction is opposed by AUF1 binding to the ARE or Hsp70. A model is proposed in which translation-dependent displacement of AUF1-PABP complexes from ARE-mRNAs may unmask the poly(A) tail.","method":"Purified recombinant proteins with synthetic ARE RNA, in vitro binding assays, co-immunoprecipitation in vivo","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with purified proteins, confirmed in vivo by Co-IP, multiple interactions tested","pmids":["16556936"],"is_preprint":false},{"year":2006,"finding":"AUF1 binds to the AU-rich element in the IL-6 mRNA 3'-UTR in vivo and promotes its degradation; both p37 and p42 isoforms are active. Overexpression of AUF1 destabilizes IL-6 mRNA, and RNAi knockdown stabilizes it. A cooperating 5' stem-loop structure is also required for full instability.","method":"Reporter mRNA stability assays (GFP chimeras), siRNA knockdown, scanning mutagenesis, myc-tagged AUF1 co-immunoprecipitation of IL-6 mRNA","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (reporter assays, mutagenesis, RNAi, RIP) in a single study","pmids":["16954375"],"is_preprint":false},{"year":2006,"finding":"14-3-3σ selectively binds to p37 AUF1 (and to a lesser extent p40) at a region overlapping the nuclear localization signal. 14-3-3σ overexpression increases cytoplasmic accumulation of p37 AUF1 and reduces ARE-mRNA half-life; siRNA silencing of AUF1 eliminates this effect, indicating 14-3-3σ promotes ARE-mRNA decay by retaining p37 AUF1 in the cytoplasm.","method":"Mass spectrometry identification of AUF1-interacting proteins, co-immunoprecipitation, subcellular fractionation, siRNA knockdown, ARE-mRNA reporter half-life assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS identification confirmed by Co-IP, localization studies, and functional mRNA decay assays with epistasis (siRNA rescue), single lab","pmids":["16902409"],"is_preprint":false},{"year":2006,"finding":"AUF1 is phosphorylated by the oncogenic tyrosine kinase NPM-ALK in vitro, and is hyperphosphorylated in NPM-ALK-expressing cells. AUF1 co-immunoprecipitates with ALK in ALCL cells and NIH3T3 cells expressing NPM-ALK. Hyperphosphorylation of AUF1 correlates with increased stability of AUF1 target mRNAs encoding cell-proliferation regulators.","method":"Co-immunoprecipitation, in vitro kinase assay, phosphorylation analysis, mRNA stability assays","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay plus in vivo Co-IP and mRNA stability correlation; single lab","pmids":["16835382"],"is_preprint":false},{"year":2006,"finding":"AUF1 destabilizes DNMT1 mRNA by binding to an AU-rich conserved element in DNMT1 3'-UTR and targeting it for exosome-mediated degradation. AUF1 protein levels are regulated by the proteasome in a cell-cycle-dependent manner, creating cell cycle-specific DNMT1 mRNA destabilization. AUF1 knockdown leads to DNMT1 overexpression, increased DNA methyltransferase activity, and genome hypermethylation.","method":"RIP, mRNA stability assays, AUF1 siRNA knockdown, DNMT1 reporter assays, methylation analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RIP, stability assay, KD, methylation readout) and epistasis (concurrent DNMT1+AUF1 KD)","pmids":["17030625"],"is_preprint":false},{"year":2006,"finding":"AUF1 knockout mice develop severe endotoxic shock upon bacterial endotoxin challenge due to failure to degrade TNFα and IL-1β mRNAs in macrophages. This demonstrates AUF1 functions as a crucial attenuator of the inflammatory response by promoting rapid decay of selective proinflammatory cytokine mRNAs following endotoxin activation.","method":"AUF1 knockout mouse model, endotoxin challenge, mRNA decay assays, neutralizing antibody rescue experiments","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO model with specific mRNA decay phenotype and rescue experiments (neutralizing antibodies), multiple cytokine targets validated","pmids":["17085481"],"is_preprint":false},{"year":2007,"finding":"AUF1 and TIAR compete for binding to MYC mRNA ARE; AUF1 promotes MYC translation while TIAR suppresses it. MYC translation and cell proliferation are proportional to AUF1 abundance and inversely proportional to TIAR abundance. Altering one ARE-binding protein's association with MYC mRNA reciprocally affects the other's binding. Genetic experiments show AUF1 and TIAR control proliferation through a MYC-dependent pathway.","method":"RIP, polysome analysis, cell proliferation assays, genetic epistasis with siRNA knockdown","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — RIP, polysome analysis, and genetic epistasis across multiple orthogonal approaches in a single study","pmids":["17486099"],"is_preprint":false},{"year":2010,"finding":"All four AUF1 isoforms exist as dimers in solution. Exon 2-encoded sequences inhibit RNA-binding affinity, while exon 7-encoded sequences enhance RNA-dependent protein oligomerization and can confer cooperative RNA-binding in some contexts. Different AUF1 isoforms remodel bound RNA substrates into divergent structures as a function of protein:RNA stoichiometry.","method":"Chemical cross-linking, gel filtration chromatography, EMSA, fluorescence anisotropy, FRET-based RNA structure assays, purified recombinant isoforms","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic in vitro biochemical characterization of all four purified isoforms with multiple orthogonal methods in a single study","pmids":["20926381"],"is_preprint":false},{"year":2010,"finding":"HuR destabilizes p16(INK4) mRNA using AUF1 as a cofactor; knockdown of either alone increases p16 expression, but concomitant knockdown has much weaker effect. AUF1 and HuR mutually enhance each other's binding to the p16 3'UTR, and both recruit Ago2/RISC to destabilize p16 mRNA. The secondary stem-loop structure in p16 3'UTR is required for this effect.","method":"siRNA knockdown (single and double KD), RIP, EGFP-p16 chimeric reporter assays with stem-loop mutations, Ago2 co-IP","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — double KD epistasis, multiple reporter and RIP assays, mutagenesis of functional element, single lab","pmids":["20498276"],"is_preprint":false},{"year":2010,"finding":"The p40 AUF1 isoform selectively promotes LPS-induced IL10 mRNA induction and expression in monocytes; p37 does not rescue AUF1-depleted cells. AUF1 (p40) maintains proper levels of kinase TAK1 by promoting its mRNA translation (not stability), thereby activating IKKβ and NF-κB signaling to permit IL10 induction.","method":"siRNA knockdown, isoform-specific rescue with RNAi-refractory cDNA, polysome analysis, NF-κB/p38 MAPK signaling assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-specific rescue experiments plus signaling pathway analysis; multiple orthogonal methods, single lab","pmids":["21135123"],"is_preprint":false},{"year":2011,"finding":"MKP-1 promotes cytoplasmic translocation of AUF1 in LPS-stimulated macrophages, which in turn destabilizes IL-6, IL-10, and TNF-α mRNAs. AUF1 siRNA in MKP-1 WT macrophages significantly delays degradation of these cytokine mRNAs, and AUF1 binds these target mRNAs in macrophage lysates.","method":"Overexpression of MKP-1, AUF1 siRNA knockdown, mRNA half-life measurements, RIP, Western blot/immunofluorescence for localization","journal":"Cytokine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and mRNA stability assays with KO/KD models, single lab","pmids":["21733716"],"is_preprint":false},{"year":2011,"finding":"Phosphomimetic mutants of Hsp27 promote proteasome-dependent proteolysis of AUF1, thereby stabilizing ARE-mRNAs. This establishes a p38 MAPK-MK2-Hsp27 signaling axis that targets AUF1 destruction by proteasomes to promote ARE-mRNA stabilization.","method":"Hsp27 phosphomimetic mutant overexpression, proteasome inhibitor assays, AUF1 protein stability measurements, ARE-mRNA reporter assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphomimetic mutant approach with functional mRNA stability readout; single lab, single study","pmids":["21245386"],"is_preprint":false},{"year":2012,"finding":"AUF1 directly binds the p40 isoform of AUF1 binds EBER1 (EBV noncoding RNA) in vivo predominantly as the p40 isoform, as shown by UV crosslinking and SILAC mass spectrometry. EBER1 competes with ARE-containing mRNA for AUF1 p40 binding, potentially disrupting normal AUF1/ARE-mRNA homeostasis in EBV-infected cells.","method":"MS2-aptamer RNA pulldown with SILAC mass spectrometry, UV crosslinking, EMSA competition assay","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — MS identification confirmed by UV crosslinking and EMSA competition; multiple orthogonal methods in a single study","pmids":["23012480"],"is_preprint":false},{"year":2012,"finding":"AUF1 associates with DICER1 mRNA (both coding region and 3'-UTR) and lowers its stability; AUF1 silencing lengthens DICER1 mRNA half-life and increases Dicer expression, while AUF1 overexpression reduces Dicer, thereby globally reducing mature miRNA levels without affecting pre-miRNA levels.","method":"RIP, mRNA half-life assays, AUF1 siRNA KD and overexpression, miRNA northern/qPCR","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional gain- and loss-of-function with mRNA stability assays and miRNA profiling, multiple orthogonal methods","pmids":["23066106"],"is_preprint":false},{"year":2013,"finding":"AUF1 is a negative regulator of enterovirus (poliovirus, coxsackievirus, human rhinovirus) infection. All four AUF1 isoforms bind stem-loop IV of the poliovirus 5' NCR; viral proteinase 3CD cleavage inhibits this interaction. Viral protein 2A drives cytoplasmic relocalization of AUF1 during infection. AUF1 inhibits viral translation and reduces overall viral titers.","method":"In vitro binding assays with purified isoforms, immunofluorescence localization in infected cells, AUF1 overexpression/KD with viral titer assays, proteinase cleavage assay","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro binding of all isoforms, cellular localization, loss-of-function with viral titer readout, cleavage mechanism identified; multiple orthogonal methods","pmids":["23903828"],"is_preprint":false},{"year":2013,"finding":"β-TrCP (the substrate recognition subunit of SCF E3 ubiquitin ligase) targets AUF1 for ubiquitination and proteasomal degradation. Depletion of β-TrCP stabilizes AUF1; β-TrCP overexpression enhances AUF1 ubiquitination and degradation, stabilizing cytokine ARE-mRNAs. Enhanced AUF1 degradation requires phosphomimetic mutants of both Hsp27 and AUF1.","method":"siRNA depletion of β-TrCP, β-TrCP overexpression, ubiquitination assays, ARE-mRNA reporter stability assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional ubiquitination and mRNA stability assays with KD and overexpression; single lab","pmids":["23530064"],"is_preprint":false},{"year":2013,"finding":"During Coxsackievirus B3 infection, viral protease 2A drives cytoplasmic redistribution of AUF1, and viral protease 3C cleaves AUF1 in vitro. AUF1 knockdown facilitates viral RNA, protein, and progeny production; AUF1 physically interacts with the 3'-UTR of CVB3 genome RNA, targeting it for degradation.","method":"In vitro cleavage assay, immunoprecipitation, siRNA knockdown, viral titer and RNA quantification, immunofluorescence","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro cleavage identified specific protease, Co-IP of viral RNA, KD with functional viral titer; single lab","pmids":["23572232"],"is_preprint":false},{"year":2014,"finding":"PAR-CLIP analysis reveals AUF1 primarily recognizes U-/GU-rich sequences in mRNAs and ncRNAs. AUF1 (1) lowers steady-state levels of numerous target RNAs including lncRNA NEAT1, affecting nuclear paraspeckle organization; (2) promotes translation of many target mRNAs without changing their abundance (ribosome profiling); (3) enhances steady-state levels of mRNAs encoding DNA-maintenance proteins. Through these actions, AUF1 preserves genomic integrity and prevents premature cellular senescence.","method":"PAR-CLIP, ribosome profiling, RNA-seq, knockdown with cellular phenotype assays (senescence, DNA damage markers)","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — transcriptome-wide PAR-CLIP with ribosome profiling and functional validation across multiple targets and phenotypes","pmids":["25366541"],"is_preprint":false},{"year":2014,"finding":"AUF1 p45 has RNA chaperone activity that aids structural rearrangement and cyclization of West Nile virus RNA, which is required for the viral replicase to initiate RNA replication. AUF1 p45 specifically supports WNV replication more than other isoforms.","method":"In vitro RNA structure assays, cell-based viral replication assays with isoform-specific expression, RNA cyclization assays","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of RNA chaperone activity plus cell-based validation; multiple orthogonal methods","pmids":["25078689"],"is_preprint":false},{"year":2014,"finding":"AUF1 binds to oxidized RNA (containing 8-oxo-7,8-dihydroguanine) specifically and is involved in elimination of oxidatively damaged mRNA in human cells. AUF1-deficient HeLa and Nalm-6 cells show growth retardation and accumulate higher levels of oxidized mRNA.","method":"AUF1 knockout by gene targeting (two different methods), oxidized RNA binding assay, mRNA stability measurements with H2O2 treatment","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent KO cell lines with functional mRNA oxidation assay; single lab","pmids":["25486179"],"is_preprint":false},{"year":2014,"finding":"AUF1 contributes to cryptochrome 1 (Cry1) mRNA decay and rhythmic translation. AUF1 directly binds the Cry1 3'UTR, interacts with eIF3B and ribosomal proteins S3 and S14, and facilitates translation of Cry1 mRNA in a 3'UTR-dependent manner. Cytoplasmic AUF1 abundance and its binding to the Cry1 3'UTR parallel the circadian CRY1 protein profile.","method":"RNA-protein interaction assays (RIP, in vitro binding), co-immunoprecipitation of ribosomal components, reporter assays, circadian expression profiling","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP, protein Co-IP with translation components, reporter assays; single lab","pmids":["24423872"],"is_preprint":false},{"year":2015,"finding":"AUF1 (p37 isoform) promotes loading of let-7b microRNA onto Argonaute 2 (AGO2); p37 has high affinity for let-7b (Kd ~6 nM). Single-molecule binding analysis shows AUF1 slows assembly of AGO2-let-7b-mRNA complex, yet AUF1 promotes AGO2-let-7-triggered target mRNA decay globally.","method":"RNP immunoprecipitation, in vitro binding assays, single-molecule analysis, fluorescence anisotropy (Kd measurement), siRNA depletion","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro Kd measurement plus single-molecule analysis and cellular RIP with functional mRNA decay readout; multiple orthogonal methods","pmids":["26253535"],"is_preprint":false},{"year":2016,"finding":"AUF1-mediated targeted mRNA decay regulates adult muscle satellite cell fate; Auf1(-/-) mice show accelerated skeletal muscle wasting and impaired repair. AUF1 promotes decay of MMP9 mRNA (among other ARE-mRNAs) in satellite cells; secreted MMP9 degrades the skeletal muscle matrix, preventing regeneration. Blocking MMP9 activity in auf1(-/-) mice restores muscle repair and satellite cell population maintenance.","method":"AUF1 knockout mouse model, satellite cell mRNA profiling, in vivo muscle injury/regeneration assays, MMP9 inhibitor rescue","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO model with specific mRNA decay phenotype, pathway placement, and pharmacological rescue; multiple orthogonal methods","pmids":["27452471"],"is_preprint":false},{"year":2018,"finding":"AUF1 p45 supports dengue virus and Zika virus replication as a general flavivirus host factor by RNA chaperone activity. AUF1 p45 destabilizes both the 3'-terminal stem-loop (3'SL) and 5'-terminal SLB to expose UAR cyclization elements, facilitating genome cyclization and enabling viral RdRp to initiate RNA synthesis, without affecting the promoter SLA.","method":"In vitro RNA structure analysis (SHAPE, enzymatic/chemical probing), cell-based viral replication assays, isoform-specific expression","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro RNA structure probing plus cell-based validation of RNA chaperone mechanism across multiple flaviviruses","pmids":["29263261"],"is_preprint":false},{"year":2018,"finding":"FBXW7 (E3 ubiquitin ligase) is responsible for protein degradation of AUF1 during ferroptosis. AUF1 antagonizes ferroptosis by up-regulating NRF2 and down-regulating ATF3 (both shown by RIP and mRNA stability assays). AUF1 stabilizes NRF2 mRNA and promotes its expression, while promoting ATF3 mRNA decay.","method":"Co-immunoprecipitation, cycloheximide chase analysis, RNA immunoprecipitation, RNA pulldown, mRNA stability assays","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for ubiquitination, RIP and stability assays for RNA targets; single lab, multiple methods","pmids":["35391558"],"is_preprint":false},{"year":2019,"finding":"HNRNPD/AUF1 is recruited to DNA double-strand break sites (γH2Ax foci) upon DNA damage. HNRNPD depletion impairs CHK1 S345 phosphorylation, DNA end resection (reduced ssDNA formation, reduced AsiSI-induced DSB resection, reduced RPA32 S4/8 phosphorylation). HNRNPD interacts with SAF-A. HNRNPD depletion causes accumulation of RNA:DNA hybrids (R-loops) at damage sites; expression of RNase H1 or RNA Pol II inhibition rescues the defective DNA damage response.","method":"siRNA knockdown, CRISPR/Cas9 KO, in vitro DNA resection assay, immunofluorescence (γH2Ax foci colocalization), ssDNA/RPA assays, RNA:DNA hybrid detection, co-immunoprecipitation with SAF-A","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO and siRNA with in vitro resection assay, multiple DNA damage readouts, R-loop epistasis rescue; multiple orthogonal methods","pmids":["30799487"],"is_preprint":false},{"year":2019,"finding":"AUF1 promotes skeletal muscle development and regeneration by stage-specific degradation of fate-determining checkpoint ARE-mRNAs: Twist1 mRNA decay promotes myoblast development; CyclinD1 mRNA decay blocks proliferation and initiates differentiation; RGS5 mRNA decay activates Sonic Hedgehog-mediated differentiation. CTCF activates Auf1 transcription upon satellite cell activation.","method":"AUF1 KO mice, satellite cell explant analysis, mRNA decay assays for specific targets, transcriptomic profiling at each myogenic stage","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO model with stage-specific mRNA decay analysis and specific target validation across multiple checkpoints","pmids":["31113881"],"is_preprint":false},{"year":2021,"finding":"circPCNX (hsa_circ_0032434) interacts with AUF1 and specifically competes with p21 (CDKN1A) mRNA for AUF1 binding. Overexpression of circPCNX reduces AUF1 binding to p21 mRNA, stabilizing it and increasing p21 protein production to suppress cell proliferation. Deletion of the AUF1-binding region of circPCNX abrogates p21 elevation and rescues proliferation.","method":"RNP immunoprecipitation (RIP), circPCNX overexpression/silencing, p21 mRNA stability assays, deletion mutant analysis of AUF1-binding region","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — RIP, mRNA stability, gain- and loss-of-function with deletion mutant rescue; multiple orthogonal methods in single study","pmids":["33444453"],"is_preprint":false}],"current_model":"HNRNPD/AUF1 is a family of four alternatively spliced RNA-binding protein isoforms (p37, p40, p42, p45) that recognize U-/AU-rich elements (AREs) in mRNA 3'-UTRs primarily via two RRMs plus auxiliary N-terminal and C-terminal domains; it promotes ARE-mRNA decay by assembling oligomeric complexes on target mRNAs and recruiting the translation initiation factor eIF4G, poly(A)-binding protein, Hsp70/Hsc70, and the exosome, while isoform-specific nucleocytoplasmic shuttling (nuclear import via C-terminal signal in p37/p40; nuclear export via exon 7 in p42/p45) and differential ubiquitination by SCF-β-TrCP and FBXW7 regulate its activity; beyond mRNA decay, AUF1 promotes miRNA loading onto AGO2, maintains genomic integrity by facilitating DNA end resection and suppressing R-loop accumulation, and acts as an RNA chaperone facilitating flavivirus genome cyclization."},"narrative":{"mechanistic_narrative":"HNRNPD/AUF1 is a family of four alternatively spliced RNA-binding protein isoforms (p37, p40, p42, p45) generated from a single gene that controls post-transcriptional gene expression chiefly by recognizing U-/AU-rich elements (AREs) in mRNA 3'-UTRs and directing target mRNA decay [PMID:8246982, PMID:9521873, PMID:12944492, PMID:25366541]. High-affinity ARE recognition is achieved through two RNA recognition motifs assisted by N- and C-terminal accessory regions; AUF1 binds as a dimer that cross-links into tetramers/hexamers and remodels the bound RNA into a condensed structure, with oligomerization being essential for high-affinity binding [PMID:9346902, PMID:10559216, PMID:11514570, PMID:20926381]. On target mRNAs AUF1 nucleates a decay-competent ribonucleoprotein complex, interacting with translation initiation factor eIF4G and poly(A)-binding protein independently of ARE binding and partitioning with the exosome in the cytoplasm, thereby coupling translation status to deadenylation and degradation [PMID:15257295, PMID:16556936]. AUF1 activity is governed by isoform-specific, energy-dependent nucleocytoplasmic shuttling — nuclear import via a C-terminal signal in p37/p40 and exon-7-mediated export in p42/p45, with SAF-B retaining p42/p45 in the nucleus and 14-3-3σ driving cytoplasmic accumulation of p37 — and by proteolytic control, since p37/p40 are selectively ubiquitinated and degraded while exon 7 blocks this fate [PMID:10933876, PMID:12136087, PMID:12668672, PMID:16902409]. Multiple signaling inputs (p38-MK2-Hsp27, β-TrCP, FBXW7) tune AUF1 abundance through the proteasome to set ARE-mRNA stability [PMID:21245386, PMID:23530064, PMID:35391558]. Physiologically, AUF1 is a critical attenuator of inflammation, since knockout mice fail to degrade TNFα and IL-1β mRNAs and develop endotoxic shock [PMID:17085481], and it governs muscle satellite cell fate and regeneration by stage-specific decay of checkpoint mRNAs such as MMP9, Twist1, and CyclinD1 [PMID:27452471, PMID:31113881]. Beyond decay, AUF1 promotes translation of select mRNAs, loads let-7 microRNA onto AGO2, preserves genomic integrity by facilitating DNA end resection and suppressing R-loops at double-strand breaks, and acts as an RNA chaperone that drives flavivirus genome cyclization [PMID:25366541, PMID:26253535, PMID:30799487, PMID:29263261].","teleology":[{"year":1993,"claim":"Established AUF1 as the RNA-binding component of an mRNA degradation activity, defining its founding biochemical identity.","evidence":"Biochemical purification from K562 postribosomal supernatant, UV crosslinking, and cDNA cloning revealing two RRMs","pmids":["8246982"],"confidence":"High","gaps":["Did not resolve which specific mRNA sequences are targeted","Did not establish in vivo decay specificity"]},{"year":1998,"claim":"Showed the four isoforms arise from alternative splicing of one gene with distinct RNA-binding properties, framing isoform-specific function.","evidence":"Genomic cloning, FISH, RT-PCR and immunoblot","pmids":["9521873"],"confidence":"High","gaps":["Did not assign distinct cellular roles to each isoform","Did not define structural basis of differential affinity"]},{"year":2001,"claim":"Defined the structural and biophysical mechanism of ARE recognition, showing oligomerization and RNA remodeling underlie high-affinity binding.","evidence":"Deletion mutagenesis, cross-linking, fluorescence anisotropy, FRET, and NMR structure of RBD2","pmids":["9346902","10559216","11514570","11531333"],"confidence":"High","gaps":["No full-length multi-domain structure on RNA","Stoichiometry on physiological transcripts not resolved"]},{"year":2003,"claim":"Linked isoform-specific subcellular trafficking and proteasomal turnover to AUF1 regulation, explaining how its activity is spatially and quantitatively controlled.","evidence":"Heterokaryon shuttling assays, GFP reporters, mutagenesis, yeast two-hybrid (SAF-B), and in vitro ubiquitination reconstitution","pmids":["12668672","12136087","10933876"],"confidence":"High","gaps":["Did not identify the import/export receptors","Did not identify the responsible E3 ligase at this stage"]},{"year":2006,"claim":"Connected AUF1 to the translation machinery and demonstrated its in vivo role as an inflammation attenuator, establishing physiological significance.","evidence":"In vitro reconstitution with eIF4G/PABP, Co-IP, AUF1 knockout mouse endotoxin challenge with neutralizing-antibody rescue, and ARE-mRNA decay assays","pmids":["16556936","17085481","16954375","16902409","13"],"confidence":"High","gaps":["Mechanism coupling translation displacement to decay not fully resolved","Exosome recruitment biochemistry not reconstituted"]},{"year":2010,"claim":"Showed AUF1 cooperates with other ARE-binding proteins and the RISC machinery to control proliferation and senescence checkpoints.","evidence":"Double-knockdown epistasis, RIP, reporter assays with HuR/TIAR and Ago2 co-IP across MYC, p16, p21 targets","pmids":["20498276","17486099","12944492"],"confidence":"High","gaps":["Rules governing competitive vs cooperative co-binding not generalized","Direct AUF1-Ago2 contacts not mapped"]},{"year":2014,"claim":"Transcriptome-wide mapping revealed AUF1 acts beyond decay — promoting translation and stabilizing DNA-maintenance mRNAs to preserve genome integrity and prevent senescence.","evidence":"PAR-CLIP, ribosome profiling, RNA-seq with knockdown senescence/DNA-damage phenotyping; let-7-AGO2 loading by single-molecule analysis","pmids":["25366541","26253535"],"confidence":"High","gaps":["Determinants distinguishing stabilized vs destabilized targets unclear","Mechanism of translational enhancement not defined"]},{"year":2018,"claim":"Identified AUF1 p45 as an RNA chaperone that drives flavivirus genome cyclization, extending its function to viral RNA structural remodeling.","evidence":"In vitro SHAPE/chemical probing of viral RNA and isoform-specific cell-based replication assays for West Nile, dengue and Zika viruses","pmids":["29263261","25078689"],"confidence":"High","gaps":["Structural basis of isoform-specific chaperone activity unresolved","Whether host RNAs are similarly remodeled not addressed"]},{"year":2019,"claim":"Placed AUF1 directly in the DNA damage response, demonstrating it promotes end resection and suppresses R-loops at break sites.","evidence":"siRNA/CRISPR KO, in vitro resection assay, γH2Ax foci colocalization, RNA:DNA hybrid detection with RNase H1 rescue, SAF-A Co-IP","pmids":["30799487"],"confidence":"High","gaps":["How RNA binding mechanistically enables resection unclear","Direct substrate RNAs at damage sites not identified"]},{"year":2022,"claim":"Identified FBXW7 as an E3 ligase degrading AUF1 during ferroptosis and connected AUF1 to NRF2/ATF3 redox control.","evidence":"Co-IP, cycloheximide chase, RIP, RNA pulldown and mRNA stability assays","pmids":["35391558"],"confidence":"Medium","gaps":["Single lab; degron and ubiquitination sites not mapped","Direct vs indirect regulation of NRF2/ATF3 not fully separated"]},{"year":null,"claim":"How AUF1 isoform composition, post-translational modification, and partner availability are integrated to switch a given transcript between decay, stabilization, and translational enhancement remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No predictive rule for decay vs stabilization outcome","No full-length isoform-RNA structure","Mechanistic coupling of nuclear (resection, R-loop) and cytoplasmic (decay, translation) roles unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,3,11,15,21,31,35]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[6,8]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[11,18,31]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[32,37]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[6]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[14,23,31,34]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,5,10,13,39]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,10,13,16,24]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[39]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[11,15,31,35]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[15,19,23,24]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[39]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[36,40]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[9,29,38]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[5,10,16]}],"complexes":[],"partners":["EIF4G1","PABPC1","HUR/ELAVL1","SAFB","YBX1","AGO2","SAFA/HNRNPU","YWHAS/SFN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q14103","full_name":"Heterogeneous nuclear ribonucleoprotein D0","aliases":["AU-rich element RNA-binding protein 1"],"length_aa":355,"mass_kda":38.4,"function":"Binds with high affinity to RNA molecules that contain AU-rich elements (AREs) found within the 3'-UTR of many proto-oncogenes and cytokine mRNAs. Also binds to double- and single-stranded DNA sequences in a specific manner and functions a transcription factor. Each of the RNA-binding domains specifically can bind solely to a single-stranded non-monotonous 5'-UUAG-3' sequence and also weaker to the single-stranded 5'-TTAGGG-3' telomeric DNA repeat. Binds RNA oligonucleotides with 5'-UUAGGG-3' repeats more tightly than the telomeric single-stranded DNA 5'-TTAGGG-3' repeats. Binding of RRM1 to DNA inhibits the formation of DNA quadruplex structure which may play a role in telomere elongation. May be involved in translationally coupled mRNA turnover. Implicated with other RNA-binding proteins in the cytoplasmic deadenylation/translational and decay interplay of the FOS mRNA mediated by the major coding-region determinant of instability (mCRD) domain. May play a role in the regulation of the rhythmic expression of circadian clock core genes. Directly binds to the 3'UTR of CRY1 mRNA and induces CRY1 rhythmic translation. May also be involved in the regulation of PER2 translation","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q14103/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HNRNPD","classification":"Not Classified","n_dependent_lines":144,"n_total_lines":1208,"dependency_fraction":0.11920529801324503},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000138668","cell_line_id":"CID001836","localizations":[{"compartment":"nucleoplasm","grade":3},{"compartment":"chromatin","grade":2}],"interactors":[{"gene":"HNRNPC","stoichiometry":10.0},{"gene":"HNRNPU","stoichiometry":10.0},{"gene":"DDX21","stoichiometry":4.0},{"gene":"HNRNPL","stoichiometry":4.0},{"gene":"IGF2BP1","stoichiometry":4.0},{"gene":"RBMX","stoichiometry":4.0},{"gene":"SNRPA","stoichiometry":4.0},{"gene":"SNRPC","stoichiometry":4.0},{"gene":"SSRP1","stoichiometry":4.0},{"gene":"TNPO1","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001836","total_profiled":1310},"omim":[{"mim_id":"621322","title":"FOXO-INDUCED LONG NONCODING RNA 1; FILNC1","url":"https://www.omim.org/entry/621322"},{"mim_id":"617071","title":"LONG NONCODING RNA 13","url":"https://www.omim.org/entry/617071"},{"mim_id":"613568","title":"ZINC FINGER, MYM-TYPE 4; ZMYM4","url":"https://www.omim.org/entry/613568"},{"mim_id":"612006","title":"CELIAC DISEASE, SUSCEPTIBILITY TO, 8; CELIAC8","url":"https://www.omim.org/entry/612006"},{"mim_id":"607137","title":"HETEROGENEOUS NUCLEAR RIBONUCLEOPROTEIN D-LIKE PROTEIN; HNRNPDL","url":"https://www.omim.org/entry/607137"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HNRNPD"},"hgnc":{"alias_symbol":[],"prev_symbol":["AUF1","HNRPD"]},"alphafold":{"accession":"Q14103","domains":[{"cath_id":"3.30.70.330","chopping":"91-170","consensus_level":"high","plddt":87.6308,"start":91,"end":170},{"cath_id":"3.30.70.330","chopping":"182-260","consensus_level":"high","plddt":81.5156,"start":182,"end":260}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14103","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14103-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14103-F1-predicted_aligned_error_v6.png","plddt_mean":62.47},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HNRNPD","jax_strain_url":"https://www.jax.org/strain/search?query=HNRNPD"},"sequence":{"accession":"Q14103","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14103.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14103/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14103"}},"corpus_meta":[{"pmid":"8246982","id":"PMC_8246982","title":"Purification, characterization, and cDNA cloning of an AU-rich element RNA-binding protein, AUF1.","date":"1993","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/8246982","citation_count":501,"is_preprint":false},{"pmid":"15257295","id":"PMC_15257295","title":"Concurrent versus individual binding of HuR and AUF1 to common labile target mRNAs.","date":"2004","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/15257295","citation_count":412,"is_preprint":false},{"pmid":"9521873","id":"PMC_9521873","title":"Structure and genomic organization of the human AUF1 gene: alternative pre-mRNA splicing generates four protein isoforms.","date":"1998","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/9521873","citation_count":228,"is_preprint":false},{"pmid":"17085481","id":"PMC_17085481","title":"Endotoxic shock in AUF1 knockout mice mediated by failure to degrade proinflammatory cytokine mRNAs.","date":"2006","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/17085481","citation_count":178,"is_preprint":false},{"pmid":"21956942","id":"PMC_21956942","title":"The role of AUF1 in regulated mRNA decay.","date":"2010","source":"Wiley interdisciplinary reviews. 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The N-terminus is required for dimerization, and AUF1 binds an ARE as a hexameric protein, indicating protein-protein interactions are essential for high-affinity ARE binding.\",\n      \"method\": \"In vitro RNA binding assays with AUF1 deletion mutants, gel mobility shift assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic deletion mutagenesis with in vitro binding assays; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"9346902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The four AUF1 isoforms (p37, p40, p42, p45) are generated by alternative pre-mRNA splicing of a single gene at chromosome 4q21.1-q21.2; the different isoforms exhibit different RNA-binding affinities and specificities.\",\n      \"method\": \"Genomic cloning, Southern blotting, FISH, RT-PCR, immunoblot\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct genomic sequencing combined with functional binding assays, replicated in multiple lines\",\n      \"pmids\": [\"9521873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AUF1 assembles on U-rich ARE RNA by sequential dimer binding: AUF1 dimers cross-link to form tetramers on high-affinity RNA targets. Sequences C-terminal to the RRMs contribute to tetramer-ARE complex formation but are not required for RNA binding. ARE-AUF1 complexes are highly dynamic in solution.\",\n      \"method\": \"Gel mobility shift assay, chemical cross-linking, fluorescence anisotropy with fluorescent RNA substrates, deletion mutant analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal in vitro methods (cross-linking, fluorescence anisotropy, deletion mutants) in a single study\",\n      \"pmids\": [\"10559216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AUF1 mRNA contains alternative 3'-UTR splice variants including a conserved 107-nt exon 9; inclusion of a spliceable intron 9 downstream of the stop codon triggers nonsense-mediated mRNA decay, providing a self-regulatory mechanism for AUF1 expression. Intronic AUF1-binding sequences in the unspliceable form also repress expression in cis.\",\n      \"method\": \"Luciferase-AUF1 3'UTR chimeric transcript reporter assays, deletion analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with deletion mutants, single lab, functional validation of regulatory mechanism\",\n      \"pmids\": [\"10330146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SAF-B (scaffold attachment factor B), a nuclear matrix-associated protein, interacts specifically with the p42/p45 AUF1 isoforms via their C-terminal exon 7-encoded sequence. This interaction retains p42/p45 in the nucleus (nuclear retention activity mapped to exon 7 region), while p40/p37 undergo continuous nucleocytoplasmic shuttling. p45/p42 isoforms act as negative regulators of gene expression by forming a complex with SAF-B.\",\n      \"method\": \"Yeast two-hybrid screening, in vitro binding confirmation, heterokaryon shuttling assay, RNA Pol II inhibitor treatment, colocalization by immunofluorescence\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid confirmed in vitro plus cellular localization experiments with multiple orthogonal methods\",\n      \"pmids\": [\"10933876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"AUF1 functions as the DNA-binding component CBF2 at the Epstein-Barr virus C promoter (Cp); AUF1 binds a specific sequence within the EBNA2 enhancer in Cp, and stimulation of the cAMP/PKA signaling pathway increases AUF1/CBF2 binding activity and enhances EBNA2-mediated transcriptional activation.\",\n      \"method\": \"Biochemical purification of CBF2, microsequencing, antibody supershift in EMSA, cAMP/PKA stimulation assays, transfection reporter assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct biochemical purification with peptide sequencing, EMSA supershift, and functional transcription assays\",\n      \"pmids\": [\"10933728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"AUF1 binding to ARE RNA induces condensation of the RNA into a compact structure distinct from the folded structure stabilized by multivalent cations (Mg2+). Mg2+-induced folding of the TNFα ARE inhibits AUF1 binding and oligomerization.\",\n      \"method\": \"Fluorescence resonance energy transfer (FRET), gel mobility shift assays, fluorescence anisotropy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro structural/biophysical analysis with multiple orthogonal approaches in a single study\",\n      \"pmids\": [\"11514570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NMR structure of the C-terminal RBD (RBD2) of hnRNP D0/AUF1 reveals a five-stranded antiparallel beta-sheet packed against two alpha-helices; chemical shift perturbation showed that the beta4(-) to beta4 region contacts RNA (and DNA in essentially the same way). Slow conformational exchange in the beta4(-) to beta4 region of free RBD2 is quenched upon complex formation with DNA.\",\n      \"method\": \"NMR structure determination, relaxation/dynamics analysis, chemical shift perturbation mapping\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — full NMR structure with backbone dynamics analysis; single lab but multiple orthogonal NMR methods\",\n      \"pmids\": [\"11531333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The p37 and p40 AUF1 isoforms are selectively ubiquitinated and degraded by the proteasome, whereas p42 and p45 are not. The C-terminal exon 7 sequence (present only in p42/p45) blocks ubiquitination; deletion of exon 7 permits ubiquitination and rapid degradation of normally stable AUF1 proteins.\",\n      \"method\": \"In vitro ubiquitination system, overexpression of ubiquitin-cycle enzymes, proteasome inhibitor assays, deletion mutagenesis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination reconstitution plus cellular validation with deletion mutants and multiple controls\",\n      \"pmids\": [\"12136087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"All four AUF1 isoforms undergo rapid, transcription-independent, carrier-mediated, energy-requiring nucleocytoplasmic shuttling. Nuclear import is mediated by a C-terminal signal found only in the two smaller isoforms (p37, p40); nuclear export is facilitated by exon 7 sequences found only in the two larger isoforms (p42, p45). A subset of AUF1 proteins directly interact in vitro and in vivo in the absence of RNA, forming heterocomplexes that may co-shuttle.\",\n      \"method\": \"Heterokaryon shuttling assay, GFP fusion reporter constructs, mutagenesis mapping, in vitro protein interaction with purified recombinant proteins, leptomycin B treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (heterokaryon assay, GFP reporters, mutagenesis, purified protein interactions) in a single study\",\n      \"pmids\": [\"12668672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The p37 AUF1 isoform (and to a lesser extent p40) possesses ARE-mRNA destabilizing activity when overexpressed and is a limiting component for ARE-mRNA decay. p37 AUF1 overexpression restores rapid degradation of ARE-mRNAs in cells where this activity is saturated, and eliminates the translation-dependent step normally required for ARE-mRNA decay.\",\n      \"method\": \"Overexpression of individual AUF1 isoforms, mRNA half-life measurements, reporter mRNA assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct functional assays with isoform-specific overexpression and mRNA half-life measurements; replicated across multiple experiments\",\n      \"pmids\": [\"12944492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"AUF1 interacts with ubiquitin-conjugating enzyme E2I, and the RNA-binding proteins NSEP-1, NSAP-1, and IMP-2 in a yeast two-hybrid screen; all interactions were confirmed in vitro with purified proteins. NSEP-1 showed endoribonuclease activity in vitro. The interacting proteins can simultaneously bind an AU-rich RNA oligonucleotide with AUF1.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding with recombinant proteins, domain mapping, gel-shift assays with recombinant proteins\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed in vitro with purified proteins, single lab\",\n      \"pmids\": [\"12674497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HuR and AUF1 can bind common target mRNAs (p21, cyclin D1) on both distinct nonoverlapping sites and on common sites in a competitive fashion. In the nucleus, both proteins are found together in stable ribonucleoprotein complexes; in the cytoplasm, HuR colocalizes with the translational apparatus and AUF1 colocalizes with the exosome.\",\n      \"method\": \"RNP immunoprecipitation, UV crosslinking, sucrose gradient fractionation, immunofluorescence colocalization\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RIP, UV-crosslink, fractionation, colocalization) across multiple target mRNAs, single lab\",\n      \"pmids\": [\"15257295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"All four AUF1 isoforms bind directly to translation initiation factor eIF4G at its C-terminal site, independently of ARE binding. AUF1 also directly interacts with poly(A)-binding protein (PABP) both independently of and in complex with eIF4G; AUF1-PABP interaction is opposed by AUF1 binding to the ARE or Hsp70. A model is proposed in which translation-dependent displacement of AUF1-PABP complexes from ARE-mRNAs may unmask the poly(A) tail.\",\n      \"method\": \"Purified recombinant proteins with synthetic ARE RNA, in vitro binding assays, co-immunoprecipitation in vivo\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with purified proteins, confirmed in vivo by Co-IP, multiple interactions tested\",\n      \"pmids\": [\"16556936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AUF1 binds to the AU-rich element in the IL-6 mRNA 3'-UTR in vivo and promotes its degradation; both p37 and p42 isoforms are active. Overexpression of AUF1 destabilizes IL-6 mRNA, and RNAi knockdown stabilizes it. A cooperating 5' stem-loop structure is also required for full instability.\",\n      \"method\": \"Reporter mRNA stability assays (GFP chimeras), siRNA knockdown, scanning mutagenesis, myc-tagged AUF1 co-immunoprecipitation of IL-6 mRNA\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (reporter assays, mutagenesis, RNAi, RIP) in a single study\",\n      \"pmids\": [\"16954375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"14-3-3σ selectively binds to p37 AUF1 (and to a lesser extent p40) at a region overlapping the nuclear localization signal. 14-3-3σ overexpression increases cytoplasmic accumulation of p37 AUF1 and reduces ARE-mRNA half-life; siRNA silencing of AUF1 eliminates this effect, indicating 14-3-3σ promotes ARE-mRNA decay by retaining p37 AUF1 in the cytoplasm.\",\n      \"method\": \"Mass spectrometry identification of AUF1-interacting proteins, co-immunoprecipitation, subcellular fractionation, siRNA knockdown, ARE-mRNA reporter half-life assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS identification confirmed by Co-IP, localization studies, and functional mRNA decay assays with epistasis (siRNA rescue), single lab\",\n      \"pmids\": [\"16902409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AUF1 is phosphorylated by the oncogenic tyrosine kinase NPM-ALK in vitro, and is hyperphosphorylated in NPM-ALK-expressing cells. AUF1 co-immunoprecipitates with ALK in ALCL cells and NIH3T3 cells expressing NPM-ALK. Hyperphosphorylation of AUF1 correlates with increased stability of AUF1 target mRNAs encoding cell-proliferation regulators.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, phosphorylation analysis, mRNA stability assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay plus in vivo Co-IP and mRNA stability correlation; single lab\",\n      \"pmids\": [\"16835382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AUF1 destabilizes DNMT1 mRNA by binding to an AU-rich conserved element in DNMT1 3'-UTR and targeting it for exosome-mediated degradation. AUF1 protein levels are regulated by the proteasome in a cell-cycle-dependent manner, creating cell cycle-specific DNMT1 mRNA destabilization. AUF1 knockdown leads to DNMT1 overexpression, increased DNA methyltransferase activity, and genome hypermethylation.\",\n      \"method\": \"RIP, mRNA stability assays, AUF1 siRNA knockdown, DNMT1 reporter assays, methylation analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RIP, stability assay, KD, methylation readout) and epistasis (concurrent DNMT1+AUF1 KD)\",\n      \"pmids\": [\"17030625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AUF1 knockout mice develop severe endotoxic shock upon bacterial endotoxin challenge due to failure to degrade TNFα and IL-1β mRNAs in macrophages. This demonstrates AUF1 functions as a crucial attenuator of the inflammatory response by promoting rapid decay of selective proinflammatory cytokine mRNAs following endotoxin activation.\",\n      \"method\": \"AUF1 knockout mouse model, endotoxin challenge, mRNA decay assays, neutralizing antibody rescue experiments\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO model with specific mRNA decay phenotype and rescue experiments (neutralizing antibodies), multiple cytokine targets validated\",\n      \"pmids\": [\"17085481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"AUF1 and TIAR compete for binding to MYC mRNA ARE; AUF1 promotes MYC translation while TIAR suppresses it. MYC translation and cell proliferation are proportional to AUF1 abundance and inversely proportional to TIAR abundance. Altering one ARE-binding protein's association with MYC mRNA reciprocally affects the other's binding. Genetic experiments show AUF1 and TIAR control proliferation through a MYC-dependent pathway.\",\n      \"method\": \"RIP, polysome analysis, cell proliferation assays, genetic epistasis with siRNA knockdown\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RIP, polysome analysis, and genetic epistasis across multiple orthogonal approaches in a single study\",\n      \"pmids\": [\"17486099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"All four AUF1 isoforms exist as dimers in solution. Exon 2-encoded sequences inhibit RNA-binding affinity, while exon 7-encoded sequences enhance RNA-dependent protein oligomerization and can confer cooperative RNA-binding in some contexts. Different AUF1 isoforms remodel bound RNA substrates into divergent structures as a function of protein:RNA stoichiometry.\",\n      \"method\": \"Chemical cross-linking, gel filtration chromatography, EMSA, fluorescence anisotropy, FRET-based RNA structure assays, purified recombinant isoforms\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic in vitro biochemical characterization of all four purified isoforms with multiple orthogonal methods in a single study\",\n      \"pmids\": [\"20926381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HuR destabilizes p16(INK4) mRNA using AUF1 as a cofactor; knockdown of either alone increases p16 expression, but concomitant knockdown has much weaker effect. AUF1 and HuR mutually enhance each other's binding to the p16 3'UTR, and both recruit Ago2/RISC to destabilize p16 mRNA. The secondary stem-loop structure in p16 3'UTR is required for this effect.\",\n      \"method\": \"siRNA knockdown (single and double KD), RIP, EGFP-p16 chimeric reporter assays with stem-loop mutations, Ago2 co-IP\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double KD epistasis, multiple reporter and RIP assays, mutagenesis of functional element, single lab\",\n      \"pmids\": [\"20498276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The p40 AUF1 isoform selectively promotes LPS-induced IL10 mRNA induction and expression in monocytes; p37 does not rescue AUF1-depleted cells. AUF1 (p40) maintains proper levels of kinase TAK1 by promoting its mRNA translation (not stability), thereby activating IKKβ and NF-κB signaling to permit IL10 induction.\",\n      \"method\": \"siRNA knockdown, isoform-specific rescue with RNAi-refractory cDNA, polysome analysis, NF-κB/p38 MAPK signaling assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-specific rescue experiments plus signaling pathway analysis; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"21135123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MKP-1 promotes cytoplasmic translocation of AUF1 in LPS-stimulated macrophages, which in turn destabilizes IL-6, IL-10, and TNF-α mRNAs. AUF1 siRNA in MKP-1 WT macrophages significantly delays degradation of these cytokine mRNAs, and AUF1 binds these target mRNAs in macrophage lysates.\",\n      \"method\": \"Overexpression of MKP-1, AUF1 siRNA knockdown, mRNA half-life measurements, RIP, Western blot/immunofluorescence for localization\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and mRNA stability assays with KO/KD models, single lab\",\n      \"pmids\": [\"21733716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Phosphomimetic mutants of Hsp27 promote proteasome-dependent proteolysis of AUF1, thereby stabilizing ARE-mRNAs. This establishes a p38 MAPK-MK2-Hsp27 signaling axis that targets AUF1 destruction by proteasomes to promote ARE-mRNA stabilization.\",\n      \"method\": \"Hsp27 phosphomimetic mutant overexpression, proteasome inhibitor assays, AUF1 protein stability measurements, ARE-mRNA reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphomimetic mutant approach with functional mRNA stability readout; single lab, single study\",\n      \"pmids\": [\"21245386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"AUF1 directly binds the p40 isoform of AUF1 binds EBER1 (EBV noncoding RNA) in vivo predominantly as the p40 isoform, as shown by UV crosslinking and SILAC mass spectrometry. EBER1 competes with ARE-containing mRNA for AUF1 p40 binding, potentially disrupting normal AUF1/ARE-mRNA homeostasis in EBV-infected cells.\",\n      \"method\": \"MS2-aptamer RNA pulldown with SILAC mass spectrometry, UV crosslinking, EMSA competition assay\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MS identification confirmed by UV crosslinking and EMSA competition; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"23012480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"AUF1 associates with DICER1 mRNA (both coding region and 3'-UTR) and lowers its stability; AUF1 silencing lengthens DICER1 mRNA half-life and increases Dicer expression, while AUF1 overexpression reduces Dicer, thereby globally reducing mature miRNA levels without affecting pre-miRNA levels.\",\n      \"method\": \"RIP, mRNA half-life assays, AUF1 siRNA KD and overexpression, miRNA northern/qPCR\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional gain- and loss-of-function with mRNA stability assays and miRNA profiling, multiple orthogonal methods\",\n      \"pmids\": [\"23066106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AUF1 is a negative regulator of enterovirus (poliovirus, coxsackievirus, human rhinovirus) infection. All four AUF1 isoforms bind stem-loop IV of the poliovirus 5' NCR; viral proteinase 3CD cleavage inhibits this interaction. Viral protein 2A drives cytoplasmic relocalization of AUF1 during infection. AUF1 inhibits viral translation and reduces overall viral titers.\",\n      \"method\": \"In vitro binding assays with purified isoforms, immunofluorescence localization in infected cells, AUF1 overexpression/KD with viral titer assays, proteinase cleavage assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro binding of all isoforms, cellular localization, loss-of-function with viral titer readout, cleavage mechanism identified; multiple orthogonal methods\",\n      \"pmids\": [\"23903828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"β-TrCP (the substrate recognition subunit of SCF E3 ubiquitin ligase) targets AUF1 for ubiquitination and proteasomal degradation. Depletion of β-TrCP stabilizes AUF1; β-TrCP overexpression enhances AUF1 ubiquitination and degradation, stabilizing cytokine ARE-mRNAs. Enhanced AUF1 degradation requires phosphomimetic mutants of both Hsp27 and AUF1.\",\n      \"method\": \"siRNA depletion of β-TrCP, β-TrCP overexpression, ubiquitination assays, ARE-mRNA reporter stability assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional ubiquitination and mRNA stability assays with KD and overexpression; single lab\",\n      \"pmids\": [\"23530064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"During Coxsackievirus B3 infection, viral protease 2A drives cytoplasmic redistribution of AUF1, and viral protease 3C cleaves AUF1 in vitro. AUF1 knockdown facilitates viral RNA, protein, and progeny production; AUF1 physically interacts with the 3'-UTR of CVB3 genome RNA, targeting it for degradation.\",\n      \"method\": \"In vitro cleavage assay, immunoprecipitation, siRNA knockdown, viral titer and RNA quantification, immunofluorescence\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro cleavage identified specific protease, Co-IP of viral RNA, KD with functional viral titer; single lab\",\n      \"pmids\": [\"23572232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PAR-CLIP analysis reveals AUF1 primarily recognizes U-/GU-rich sequences in mRNAs and ncRNAs. AUF1 (1) lowers steady-state levels of numerous target RNAs including lncRNA NEAT1, affecting nuclear paraspeckle organization; (2) promotes translation of many target mRNAs without changing their abundance (ribosome profiling); (3) enhances steady-state levels of mRNAs encoding DNA-maintenance proteins. Through these actions, AUF1 preserves genomic integrity and prevents premature cellular senescence.\",\n      \"method\": \"PAR-CLIP, ribosome profiling, RNA-seq, knockdown with cellular phenotype assays (senescence, DNA damage markers)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — transcriptome-wide PAR-CLIP with ribosome profiling and functional validation across multiple targets and phenotypes\",\n      \"pmids\": [\"25366541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AUF1 p45 has RNA chaperone activity that aids structural rearrangement and cyclization of West Nile virus RNA, which is required for the viral replicase to initiate RNA replication. AUF1 p45 specifically supports WNV replication more than other isoforms.\",\n      \"method\": \"In vitro RNA structure assays, cell-based viral replication assays with isoform-specific expression, RNA cyclization assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of RNA chaperone activity plus cell-based validation; multiple orthogonal methods\",\n      \"pmids\": [\"25078689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AUF1 binds to oxidized RNA (containing 8-oxo-7,8-dihydroguanine) specifically and is involved in elimination of oxidatively damaged mRNA in human cells. AUF1-deficient HeLa and Nalm-6 cells show growth retardation and accumulate higher levels of oxidized mRNA.\",\n      \"method\": \"AUF1 knockout by gene targeting (two different methods), oxidized RNA binding assay, mRNA stability measurements with H2O2 treatment\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent KO cell lines with functional mRNA oxidation assay; single lab\",\n      \"pmids\": [\"25486179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AUF1 contributes to cryptochrome 1 (Cry1) mRNA decay and rhythmic translation. AUF1 directly binds the Cry1 3'UTR, interacts with eIF3B and ribosomal proteins S3 and S14, and facilitates translation of Cry1 mRNA in a 3'UTR-dependent manner. Cytoplasmic AUF1 abundance and its binding to the Cry1 3'UTR parallel the circadian CRY1 protein profile.\",\n      \"method\": \"RNA-protein interaction assays (RIP, in vitro binding), co-immunoprecipitation of ribosomal components, reporter assays, circadian expression profiling\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP, protein Co-IP with translation components, reporter assays; single lab\",\n      \"pmids\": [\"24423872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AUF1 (p37 isoform) promotes loading of let-7b microRNA onto Argonaute 2 (AGO2); p37 has high affinity for let-7b (Kd ~6 nM). Single-molecule binding analysis shows AUF1 slows assembly of AGO2-let-7b-mRNA complex, yet AUF1 promotes AGO2-let-7-triggered target mRNA decay globally.\",\n      \"method\": \"RNP immunoprecipitation, in vitro binding assays, single-molecule analysis, fluorescence anisotropy (Kd measurement), siRNA depletion\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro Kd measurement plus single-molecule analysis and cellular RIP with functional mRNA decay readout; multiple orthogonal methods\",\n      \"pmids\": [\"26253535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AUF1-mediated targeted mRNA decay regulates adult muscle satellite cell fate; Auf1(-/-) mice show accelerated skeletal muscle wasting and impaired repair. AUF1 promotes decay of MMP9 mRNA (among other ARE-mRNAs) in satellite cells; secreted MMP9 degrades the skeletal muscle matrix, preventing regeneration. Blocking MMP9 activity in auf1(-/-) mice restores muscle repair and satellite cell population maintenance.\",\n      \"method\": \"AUF1 knockout mouse model, satellite cell mRNA profiling, in vivo muscle injury/regeneration assays, MMP9 inhibitor rescue\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO model with specific mRNA decay phenotype, pathway placement, and pharmacological rescue; multiple orthogonal methods\",\n      \"pmids\": [\"27452471\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"AUF1 p45 supports dengue virus and Zika virus replication as a general flavivirus host factor by RNA chaperone activity. AUF1 p45 destabilizes both the 3'-terminal stem-loop (3'SL) and 5'-terminal SLB to expose UAR cyclization elements, facilitating genome cyclization and enabling viral RdRp to initiate RNA synthesis, without affecting the promoter SLA.\",\n      \"method\": \"In vitro RNA structure analysis (SHAPE, enzymatic/chemical probing), cell-based viral replication assays, isoform-specific expression\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro RNA structure probing plus cell-based validation of RNA chaperone mechanism across multiple flaviviruses\",\n      \"pmids\": [\"29263261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FBXW7 (E3 ubiquitin ligase) is responsible for protein degradation of AUF1 during ferroptosis. AUF1 antagonizes ferroptosis by up-regulating NRF2 and down-regulating ATF3 (both shown by RIP and mRNA stability assays). AUF1 stabilizes NRF2 mRNA and promotes its expression, while promoting ATF3 mRNA decay.\",\n      \"method\": \"Co-immunoprecipitation, cycloheximide chase analysis, RNA immunoprecipitation, RNA pulldown, mRNA stability assays\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for ubiquitination, RIP and stability assays for RNA targets; single lab, multiple methods\",\n      \"pmids\": [\"35391558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HNRNPD/AUF1 is recruited to DNA double-strand break sites (γH2Ax foci) upon DNA damage. HNRNPD depletion impairs CHK1 S345 phosphorylation, DNA end resection (reduced ssDNA formation, reduced AsiSI-induced DSB resection, reduced RPA32 S4/8 phosphorylation). HNRNPD interacts with SAF-A. HNRNPD depletion causes accumulation of RNA:DNA hybrids (R-loops) at damage sites; expression of RNase H1 or RNA Pol II inhibition rescues the defective DNA damage response.\",\n      \"method\": \"siRNA knockdown, CRISPR/Cas9 KO, in vitro DNA resection assay, immunofluorescence (γH2Ax foci colocalization), ssDNA/RPA assays, RNA:DNA hybrid detection, co-immunoprecipitation with SAF-A\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO and siRNA with in vitro resection assay, multiple DNA damage readouts, R-loop epistasis rescue; multiple orthogonal methods\",\n      \"pmids\": [\"30799487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AUF1 promotes skeletal muscle development and regeneration by stage-specific degradation of fate-determining checkpoint ARE-mRNAs: Twist1 mRNA decay promotes myoblast development; CyclinD1 mRNA decay blocks proliferation and initiates differentiation; RGS5 mRNA decay activates Sonic Hedgehog-mediated differentiation. CTCF activates Auf1 transcription upon satellite cell activation.\",\n      \"method\": \"AUF1 KO mice, satellite cell explant analysis, mRNA decay assays for specific targets, transcriptomic profiling at each myogenic stage\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO model with stage-specific mRNA decay analysis and specific target validation across multiple checkpoints\",\n      \"pmids\": [\"31113881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"circPCNX (hsa_circ_0032434) interacts with AUF1 and specifically competes with p21 (CDKN1A) mRNA for AUF1 binding. Overexpression of circPCNX reduces AUF1 binding to p21 mRNA, stabilizing it and increasing p21 protein production to suppress cell proliferation. Deletion of the AUF1-binding region of circPCNX abrogates p21 elevation and rescues proliferation.\",\n      \"method\": \"RNP immunoprecipitation (RIP), circPCNX overexpression/silencing, p21 mRNA stability assays, deletion mutant analysis of AUF1-binding region\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RIP, mRNA stability, gain- and loss-of-function with deletion mutant rescue; multiple orthogonal methods in single study\",\n      \"pmids\": [\"33444453\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HNRNPD/AUF1 is a family of four alternatively spliced RNA-binding protein isoforms (p37, p40, p42, p45) that recognize U-/AU-rich elements (AREs) in mRNA 3'-UTRs primarily via two RRMs plus auxiliary N-terminal and C-terminal domains; it promotes ARE-mRNA decay by assembling oligomeric complexes on target mRNAs and recruiting the translation initiation factor eIF4G, poly(A)-binding protein, Hsp70/Hsc70, and the exosome, while isoform-specific nucleocytoplasmic shuttling (nuclear import via C-terminal signal in p37/p40; nuclear export via exon 7 in p42/p45) and differential ubiquitination by SCF-β-TrCP and FBXW7 regulate its activity; beyond mRNA decay, AUF1 promotes miRNA loading onto AGO2, maintains genomic integrity by facilitating DNA end resection and suppressing R-loop accumulation, and acts as an RNA chaperone facilitating flavivirus genome cyclization.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HNRNPD/AUF1 is a family of four alternatively spliced RNA-binding protein isoforms (p37, p40, p42, p45) generated from a single gene that controls post-transcriptional gene expression chiefly by recognizing U-/AU-rich elements (AREs) in mRNA 3'-UTRs and directing target mRNA decay [#0, #2, #11, #31]. High-affinity ARE recognition is achieved through two RNA recognition motifs assisted by N- and C-terminal accessory regions; AUF1 binds as a dimer that cross-links into tetramers/hexamers and remodels the bound RNA into a condensed structure, with oligomerization being essential for high-affinity binding [#1, #3, #7, #21]. On target mRNAs AUF1 nucleates a decay-competent ribonucleoprotein complex, interacting with translation initiation factor eIF4G and poly(A)-binding protein independently of ARE binding and partitioning with the exosome in the cytoplasm, thereby coupling translation status to deadenylation and degradation [#13, #14]. AUF1 activity is governed by isoform-specific, energy-dependent nucleocytoplasmic shuttling — nuclear import via a C-terminal signal in p37/p40 and exon-7-mediated export in p42/p45, with SAF-B retaining p42/p45 in the nucleus and 14-3-3\\u03c3 driving cytoplasmic accumulation of p37 — and by proteolytic control, since p37/p40 are selectively ubiquitinated and degraded while exon 7 blocks this fate [#5, #9, #10, #16]. Multiple signaling inputs (p38-MK2-Hsp27, \\u03b2-TrCP, FBXW7) tune AUF1 abundance through the proteasome to set ARE-mRNA stability [#25, #29, #38]. Physiologically, AUF1 is a critical attenuator of inflammation, since knockout mice fail to degrade TNF\\u03b1 and IL-1\\u03b2 mRNAs and develop endotoxic shock [#19], and it governs muscle satellite cell fate and regeneration by stage-specific decay of checkpoint mRNAs such as MMP9, Twist1, and CyclinD1 [#36, #40]. Beyond decay, AUF1 promotes translation of select mRNAs, loads let-7 microRNA onto AGO2, preserves genomic integrity by facilitating DNA end resection and suppressing R-loops at double-strand breaks, and acts as an RNA chaperone that drives flavivirus genome cyclization [#31, #35, #39, #37].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established AUF1 as the RNA-binding component of an mRNA degradation activity, defining its founding biochemical identity.\",\n      \"evidence\": \"Biochemical purification from K562 postribosomal supernatant, UV crosslinking, and cDNA cloning revealing two RRMs\",\n      \"pmids\": [\"8246982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which specific mRNA sequences are targeted\", \"Did not establish in vivo decay specificity\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showed the four isoforms arise from alternative splicing of one gene with distinct RNA-binding properties, framing isoform-specific function.\",\n      \"evidence\": \"Genomic cloning, FISH, RT-PCR and immunoblot\",\n      \"pmids\": [\"9521873\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not assign distinct cellular roles to each isoform\", \"Did not define structural basis of differential affinity\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the structural and biophysical mechanism of ARE recognition, showing oligomerization and RNA remodeling underlie high-affinity binding.\",\n      \"evidence\": \"Deletion mutagenesis, cross-linking, fluorescence anisotropy, FRET, and NMR structure of RBD2\",\n      \"pmids\": [\"9346902\", \"10559216\", \"11514570\", \"11531333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length multi-domain structure on RNA\", \"Stoichiometry on physiological transcripts not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Linked isoform-specific subcellular trafficking and proteasomal turnover to AUF1 regulation, explaining how its activity is spatially and quantitatively controlled.\",\n      \"evidence\": \"Heterokaryon shuttling assays, GFP reporters, mutagenesis, yeast two-hybrid (SAF-B), and in vitro ubiquitination reconstitution\",\n      \"pmids\": [\"12668672\", \"12136087\", \"10933876\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the import/export receptors\", \"Did not identify the responsible E3 ligase at this stage\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Connected AUF1 to the translation machinery and demonstrated its in vivo role as an inflammation attenuator, establishing physiological significance.\",\n      \"evidence\": \"In vitro reconstitution with eIF4G/PABP, Co-IP, AUF1 knockout mouse endotoxin challenge with neutralizing-antibody rescue, and ARE-mRNA decay assays\",\n      \"pmids\": [\"16556936\", \"17085481\", \"16954375\", \"16902409\", \"13\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling translation displacement to decay not fully resolved\", \"Exosome recruitment biochemistry not reconstituted\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed AUF1 cooperates with other ARE-binding proteins and the RISC machinery to control proliferation and senescence checkpoints.\",\n      \"evidence\": \"Double-knockdown epistasis, RIP, reporter assays with HuR/TIAR and Ago2 co-IP across MYC, p16, p21 targets\",\n      \"pmids\": [\"20498276\", \"17486099\", \"12944492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rules governing competitive vs cooperative co-binding not generalized\", \"Direct AUF1-Ago2 contacts not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Transcriptome-wide mapping revealed AUF1 acts beyond decay — promoting translation and stabilizing DNA-maintenance mRNAs to preserve genome integrity and prevent senescence.\",\n      \"evidence\": \"PAR-CLIP, ribosome profiling, RNA-seq with knockdown senescence/DNA-damage phenotyping; let-7-AGO2 loading by single-molecule analysis\",\n      \"pmids\": [\"25366541\", \"26253535\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants distinguishing stabilized vs destabilized targets unclear\", \"Mechanism of translational enhancement not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified AUF1 p45 as an RNA chaperone that drives flavivirus genome cyclization, extending its function to viral RNA structural remodeling.\",\n      \"evidence\": \"In vitro SHAPE/chemical probing of viral RNA and isoform-specific cell-based replication assays for West Nile, dengue and Zika viruses\",\n      \"pmids\": [\"29263261\", \"25078689\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of isoform-specific chaperone activity unresolved\", \"Whether host RNAs are similarly remodeled not addressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed AUF1 directly in the DNA damage response, demonstrating it promotes end resection and suppresses R-loops at break sites.\",\n      \"evidence\": \"siRNA/CRISPR KO, in vitro resection assay, \\u03b3H2Ax foci colocalization, RNA:DNA hybrid detection with RNase H1 rescue, SAF-A Co-IP\",\n      \"pmids\": [\"30799487\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RNA binding mechanistically enables resection unclear\", \"Direct substrate RNAs at damage sites not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified FBXW7 as an E3 ligase degrading AUF1 during ferroptosis and connected AUF1 to NRF2/ATF3 redox control.\",\n      \"evidence\": \"Co-IP, cycloheximide chase, RIP, RNA pulldown and mRNA stability assays\",\n      \"pmids\": [\"35391558\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; degron and ubiquitination sites not mapped\", \"Direct vs indirect regulation of NRF2/ATF3 not fully separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AUF1 isoform composition, post-translational modification, and partner availability are integrated to switch a given transcript between decay, stabilization, and translational enhancement remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No predictive rule for decay vs stabilization outcome\", \"No full-length isoform-RNA structure\", \"Mechanistic coupling of nuclear (resection, R-loop) and cytoplasmic (decay, translation) roles unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 3, 11, 15, 21, 31, 35]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [6, 8]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [11, 18, 31]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [32, 37]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [14, 23, 31, 34]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 5, 10, 13, 39]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 10, 13, 16, 24]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [39]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [11, 15, 31, 35]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [15, 19, 23, 24]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [39]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [36, 40]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [9, 29, 38]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [5, 10, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"EIF4G1\", \"PABPC1\", \"HuR/ELAVL1\", \"SAFB\", \"YBX1\", \"AGO2\", \"SAFA/HNRNPU\", \"YWHAS/SFN\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}