{"gene":"DENR","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2014,"finding":"DENR and MCT-1 (MCTS1) form a heterodimeric complex that selectively promotes translation re-initiation after upstream ORFs (uORFs) with strong Kozak sequences, without affecting standard cap-dependent translation initiation. mRNAs containing stuORFs constitute a novel co-regulated class enriched for oncogenic kinases.","method":"Genetic knockdown/knockout in Drosophila and human cells, polysome profiling, reporter assays, ribosome profiling","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetic KO, polysome profiling, reporter assays) replicated across organisms and labs","pmids":["25043021"],"is_preprint":false},{"year":2017,"finding":"Crystal structure of human DENR-MCT-1 bound to the small (40S) ribosomal subunit revealed that the C-terminal domain of DENR occupies a binding site on the ribosome strikingly similar to that of canonical initiation factor eIF1, which controls translation fidelity and scanning, while MCT-1 contacts helix h24 of 18S rRNA.","method":"X-ray crystallography of human 40S ribosomal subunit in complex with DENR-MCT-1","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional implications, rigorously determined at defined resolution","pmids":["28723557"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of MCTS1 bound to the N-terminal domain of DENR revealed that DENR residues Glu42, Tyr43, and Tyr46 are critical for MCTS1 binding, and MCTS1 residue Phe104 is critical for tRNA binding. Both DENR-MCTS1 dimerization and tRNA binding are required for translation reinitiation activity in human cells. DENR-MCTS1 can bind tRNA independently of the ribosome, suggesting it recruits tRNA to the ribosome analogously to eIF2.","method":"X-ray crystallography, site-directed mutagenesis, in vivo translation reinitiation reporter assays, biochemical tRNA binding assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and functional validation in a single rigorous study","pmids":["29889857"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of the human MCT-1/DENR N-terminal domain heterodimer at 2.0 Å revealed that four conserved DENR cysteines (C34, C37, C44, C53) form a classical tetrahedral zinc ion-binding site essential for maintaining the MCT-1-binding interface; substitution of all four cysteines with alanine abolished heterodimer formation.","method":"X-ray crystallography, site-directed mutagenesis, biochemical dimerization assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure combined with mutagenesis demonstrating functional requirement","pmids":["30584092"],"is_preprint":false},{"year":2018,"finding":"In yeast, Tma22 (DENR ortholog), Tma20 (MCT-1 ortholog), and Tma64 (eIF2D ortholog) function as 40S ribosomal subunit recycling factors in vivo at stop codons; deletion of these genes causes 80S ribosomes to queue at stop codons and enables aberrant reinitiation including at 3' UTR AUG codons.","method":"Ribosome profiling of yeast tma deletion strains, 3' UTR reporter assays, in vitro translation","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — ribosome profiling with multiple orthogonal validations (reporter assays, in vitro translation) establishing in vivo recycling role","pmids":["30146315"],"is_preprint":false},{"year":2020,"finding":"DENR and MCTS1 are required for translational induction of ATF4 upon cellular stress by promoting translation reinitiation in the ATF4 5' UTR. DENR and MCTS1 are specifically needed for reinitiation after uORFs containing certain penultimate codons, suggesting they are required to evict specific tRNAs from post-termination 40S ribosomes.","method":"DENR/MCTS1 knockdown in human cells, polysome profiling, ATF4 reporter assays, ribosome profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated independently across two labs (PMIDs 32938922 and 32938929) using KD and reporter assays","pmids":["32938922","32938929"],"is_preprint":false},{"year":2020,"finding":"DENR and eIF2D are required for ATF4 translational induction in the integrated stress response in Drosophila and human cells. Loss of eIF2D and DENR in Drosophila causes increased vulnerability to amino acid deprivation and ER stress phenotypes similar to ATF4 mutants. eIF2D requires its RNA-binding motif for regulation of 5' leader-mediated ATF4 translation.","method":"Drosophila genetics (loss-of-function), human cell knockdown, ATF4 5' UTR reporter assays, RNA-binding domain mutagenesis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in Drosophila plus human cell validation with domain mutagenesis, two independent labs converging","pmids":["32938929","32938922"],"is_preprint":false},{"year":2020,"finding":"Crystal structure of the C-terminal domain of DENR at 1.74 Å resolution confirmed its structural resemblance to eIF1, consistent with its binding site on the ribosome near the P site and its role in initiation codon selection and scanning.","method":"X-ray crystallography","journal":"Computational and structural biotechnology journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure, single lab but structurally rigorous","pmids":["32257053"],"is_preprint":false},{"year":2021,"finding":"In yeast, the Tma20/Tma22 (MCT-1/DENR) heterodimer is responsible for the majority of 40S ribosomal subunit recycling events at stop codons, while Tma64 (eIF2D) plays only a minor role. An autism-associated mutation in TMA22 (DENR) causes loss of 40S recycling activity, directly linking ribosome recycling to neurological disease.","method":"40S ribosome footprinting (selective ribosome profiling), yeast deletion and point-mutant strains","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — dedicated 40S footprinting approach directly observing recycling intermediates, complemented by disease-relevant mutagenesis","pmids":["34016977"],"is_preprint":false},{"year":2016,"finding":"DENR, together with its binding partner MCTS1, is required for cortical neuron migration and dendritic arborization in vivo. De novo missense mutations in DENR (p.C37Y and p.P121L) found in patients with brain developmental disorders impair DENR function in mRNA translation re-initiation and disrupt cortical neuron migration and terminal branching.","method":"In utero electroporation in mice (loss-of-function), human patient variant characterization, translation re-initiation reporter assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse experiments combined with functional validation of human disease variants","pmids":["27239039"],"is_preprint":false},{"year":2017,"finding":"In human cells, DENR and MCTS1 selectively promote translation of mRNAs with very short stuORFs (coding for 1 amino acid), identifying approximately 100 target genes enriched for neuronal genes and G protein-coupled receptors.","method":"DENR/MCTS1 knockdown, polysome profiling, ribosome footprinting, reporter assays in human cells","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide translational profiling in human cells, single lab","pmids":["28623304"],"is_preprint":false},{"year":2019,"finding":"DENR promotes translation reinitiation on the Clock mRNA via a specific uORF in its 5' UTR, thereby regulating CLOCK protein biosynthesis and influencing circadian period length in mouse fibroblasts. DENR depletion shortens circadian period.","method":"Ribosome profiling in DENR-deficient NIH3T3 cells, Clock 5' UTR mutant reporter assays, circadian period measurement","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — ribosome profiling combined with 5' UTR mutagenesis and functional circadian assay","pmids":["30982898"],"is_preprint":false},{"year":2022,"finding":"DENR is phosphorylated on Serine 73 by Cyclin B/CDK1 and Cyclin A/CDK2 at the onset of mitosis and dephosphorylated as cells exit mitosis. Ser73 phosphorylation promotes DENR protein stability by preventing cleavage at Asp26, leading to enhanced translation of mitotically relevant mRNAs (~40% of translationally upregulated mitotic mRNAs are DENR targets). Absence of DENR or Ser73 phosphorylation causes elevated aberrant mitoses and cell death.","method":"Cell synchronization, phospho-specific antibodies, CDK inhibitor and mutagenesis experiments, ribosome profiling in mitotic cells, live-cell imaging","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including phospho-mutagenesis, ribosome profiling, and cellular phenotyping in a single study","pmids":["35115540"],"is_preprint":false},{"year":2022,"finding":"DENR promotes JAK2 translation by antagonizing translational repression mediated by three consecutive uORFs in the Jak2 5' UTR. DENR deficiency impairs JAK2 protein expression, reduces IFNγ-JAK-STAT signaling, and consequently decreases PD-L1 expression, thereby reducing tumor immune evasion.","method":"CRISPR/Cas9 screening, DENR knockdown/knockout in cancer cells, JAK2 uORF reporter assays, in vivo tumor models, FACS for PD-L1 and CD8+ T cell activity","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR screen plus mechanistic validation with uORF reporters and in vivo tumor models","pmids":["35440133"],"is_preprint":false},{"year":2007,"finding":"AUF1 RNA-binding protein binds to discrete ARE-containing regions in the DENR mRNA 3' UTR in a cell-density-dependent manner, and AUF1 silencing increases DENR protein levels, establishing post-transcriptional regulation of DENR expression.","method":"RNA immunoprecipitation, Western blotting, AUF1 shRNA knockdown in HEK293 cells","journal":"Cancer genomics & proteomics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — RNA-IP and KD showing regulatory interaction, single lab with two methods but indirect functional link","pmids":["17878526"],"is_preprint":false},{"year":2025,"finding":"DENR promotes ATF4 expression via uORF-mediated translational reinitiation, and DENR-driven ATF4 signaling inhibits ferroptosis in esophageal squamous cell carcinoma cells, reducing cisplatin sensitivity. Silencing ATF4 partially reverses DENR-mediated ferroptosis inhibition and DDP resistance.","method":"DENR overexpression and knockdown, ATF4 knockdown epistasis, ROS/Fe2+ measurement, in vivo xenograft tumor assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis experiment (DENR + ATF4 double knockdown) with cellular and in vivo phenotyping, single lab","pmids":["41237468"],"is_preprint":false}],"current_model":"DENR forms a stable heterodimer with MCTS1 (MCT-1) via a zinc-coordinated N-terminal interface; the complex binds the 40S ribosomal subunit through contacts with 18S rRNA, where the C-terminal domain of DENR occupies an eIF1-like position near the P site, and DENR·MCTS1 recruits tRNA to post-termination 40S ribosomes to selectively promote translation reinitiation downstream of short upstream ORFs—a process phosphoregulated by Cyclin B/CDK1 and Cyclin A/CDK2 during mitosis—thereby controlling translation of a subset of mRNAs including ATF4, JAK2, oncogenic kinases, and circadian clock components, with loss of this activity causing neuronal migration defects and aberrant cell division."},"narrative":{"mechanistic_narrative":"DENR is a translational reinitiation factor that, in heterodimer with MCTS1 (MCT-1), selectively promotes translation of mRNAs whose 5' leaders contain short upstream ORFs, without affecting bulk cap-dependent initiation [PMID:25043021]. The two subunits dimerize through a zinc-coordinated N-terminal interface: four conserved DENR cysteines (C34, C37, C44, C53) form a tetrahedral zinc site required for heterodimer formation, and DENR residues Glu42/Tyr43/Tyr46 contact MCTS1 [PMID:29889857, PMID:30584092]. The assembled complex docks on the 40S ribosomal subunit, with MCTS1 contacting helix h24 of 18S rRNA while the C-terminal domain of DENR occupies a site near the P site closely resembling that of initiation factor eIF1, consistent with a role in start-codon selection and scanning [PMID:28723557, PMID:32257053]. Functionally, DENR-MCTS1 binds and delivers tRNA to post-termination 40S ribosomes—analogous to eIF2—enabling reinitiation downstream of uORFs and acting in 40S ribosomal subunit recycling at stop codons, as established for the yeast orthologs Tma22/Tma20 [PMID:29889857, PMID:30146315, PMID:34016977]. Through this activity DENR controls a defined set of target mRNAs, including the stress-responsive transcription factor ATF4 [PMID:32938922, PMID:32938929], the kinase JAK2 (thereby tuning IFNγ-JAK-STAT signaling and PD-L1-mediated tumor immune evasion) [PMID:35440133], and the circadian gene Clock [PMID:30982898]. DENR activity is cell-cycle regulated: Cyclin B/CDK1 and Cyclin A/CDK2 phosphorylate DENR on Ser73 at mitotic onset, stabilizing the protein by blocking cleavage at Asp26 and driving translation of mitotic mRNAs, with loss of DENR or Ser73 phosphorylation causing aberrant mitoses [PMID:35115540]. De novo missense mutations in DENR (p.C37Y, p.P121L) impair reinitiation activity and disrupt cortical neuron migration and dendritic branching, linking the factor to human brain developmental disorders [PMID:27239039].","teleology":[{"year":2014,"claim":"Established that DENR-MCTS1 defines a dedicated reinitiation pathway distinct from canonical cap-dependent initiation, answering whether a specific factor controls post-uORF translation.","evidence":"Genetic knockdown/knockout in Drosophila and human cells with polysome profiling, ribosome profiling, and reporter assays","pmids":["25043021"],"confidence":"High","gaps":["Molecular basis of stuORF selectivity not defined","Structural mechanism of 40S engagement not yet resolved"]},{"year":2016,"claim":"Connected DENR reinitiation activity to an in vivo developmental process and to human disease, showing the factor is required for cortical neuron migration and that patient mutations impair its function.","evidence":"In utero electroporation in mice plus characterization of human p.C37Y/p.P121L variants in reinitiation reporter assays","pmids":["27239039"],"confidence":"High","gaps":["Specific neuronal target mRNAs driving the migration phenotype not fully defined","Whether mutations act via heterodimer disruption vs ribosome binding unresolved"]},{"year":2017,"claim":"Resolved how DENR-MCTS1 sits on the ribosome and defined its target spectrum, showing DENR mimics eIF1 at a P-site-proximal location and selectively promotes very short stuORF-containing mRNAs.","evidence":"X-ray crystallography of the human 40S-DENR-MCT-1 complex; knockdown plus ribosome footprinting and reporter assays in human cells","pmids":["28723557","28623304"],"confidence":"High","gaps":["Target set size and tissue specificity vary between studies","Functional consequence of eIF1-like positioning during scanning not directly tested"]},{"year":2018,"claim":"Defined the molecular architecture of the heterodimer and its tRNA-delivery function, showing a zinc-coordinated interface and that both dimerization and ribosome-independent tRNA binding are required for reinitiation.","evidence":"Crystal structures of MCTS1-DENR N-terminal domain with site-directed mutagenesis, dimerization assays, and tRNA-binding and reinitiation reporter assays","pmids":["29889857","30584092"],"confidence":"High","gaps":["Identity/selectivity of recruited tRNAs not fully mapped","How tRNA hand-off to the 40S P site occurs structurally unknown"]},{"year":2018,"claim":"Reframed the orthologous complex as a 40S ribosome recycling factor, showing that deletion of Tma22/Tma20/Tma64 causes 80S queuing at stop codons and aberrant reinitiation.","evidence":"Ribosome profiling of yeast tma deletion strains, 3' UTR reporter assays, and in vitro translation","pmids":["30146315"],"confidence":"High","gaps":["Relative contribution of recycling vs reinitiation in mammalian cells not delineated","Stop-codon recognition step mechanism not detailed"]},{"year":2019,"claim":"Linked DENR reinitiation to circadian timekeeping by showing it controls CLOCK protein output through a Clock 5' UTR uORF.","evidence":"Ribosome profiling in DENR-deficient NIH3T3 cells, Clock 5' UTR mutant reporters, and circadian period measurement","pmids":["30982898"],"confidence":"High","gaps":["Whether DENR-dependent CLOCK regulation operates in vivo across tissues unknown","Magnitude of contribution relative to other clock inputs unclear"]},{"year":2020,"claim":"Established DENR (with MCTS1 and eIF2D) as required for ATF4 induction in the integrated stress response, defining a codon-specific tRNA-eviction requirement for reinitiation.","evidence":"Knockdown in human cells and Drosophila genetics, ATF4 5' UTR reporters, ribosome profiling, and RNA-binding domain mutagenesis of eIF2D, converging across two labs","pmids":["32938922","32938929"],"confidence":"High","gaps":["Mechanism of penultimate-codon-dependent tRNA eviction not structurally defined","Functional division of labor between DENR-MCTS1 and eIF2D incomplete"]},{"year":2020,"claim":"Confirmed the eIF1-like architecture of the DENR C-terminal domain in isolation, reinforcing its role in initiation codon selection and scanning.","evidence":"High-resolution X-ray crystallography of the DENR C-terminal domain","pmids":["32257053"],"confidence":"High","gaps":["Direct demonstration of eIF1-like activity in fidelity control not provided","Single-lab structure"]},{"year":2021,"claim":"Directly observed recycling intermediates to show the MCT-1/DENR dimer drives the majority of 40S recycling events, and tied an autism-associated TMA22 mutation to loss of this activity.","evidence":"40S selective ribosome footprinting of yeast deletion and point-mutant strains","pmids":["34016977"],"confidence":"High","gaps":["Direct demonstration in mammalian neurons not performed","Mechanistic link from recycling defect to neurological phenotype indirect"]},{"year":2022,"claim":"Identified cell-cycle phosphoregulation of DENR, showing Cyclin B/CDK1 and Cyclin A/CDK2 phosphorylate Ser73 to stabilize DENR and drive mitotic translation, with loss causing aberrant mitoses.","evidence":"Cell synchronization, phospho-specific antibodies, CDK inhibition and phospho-mutagenesis, mitotic ribosome profiling, and live-cell imaging","pmids":["35115540"],"confidence":"High","gaps":["Protease responsible for Asp26 cleavage not identified","How phosphorylation alters ribosome engagement unknown"]},{"year":2022,"claim":"Demonstrated a cancer-immunology consequence of DENR reinitiation, showing it relieves uORF repression of JAK2 to sustain IFNγ-JAK-STAT signaling and PD-L1-mediated immune evasion.","evidence":"CRISPR/Cas9 screening, knockdown/knockout in cancer cells, JAK2 uORF reporters, in vivo tumor models, and FACS for PD-L1 and CD8+ T-cell activity","pmids":["35440133"],"confidence":"High","gaps":["Generality across tumor types not established","Direct DENR occupancy on Jak2 5' UTR not structurally shown"]},{"year":2025,"claim":"Extended DENR-ATF4 control to a survival pathway, showing DENR-driven ATF4 signaling suppresses ferroptosis and reduces cisplatin sensitivity in esophageal squamous cell carcinoma.","evidence":"DENR overexpression/knockdown with ATF4 knockdown epistasis, ROS/Fe2+ measurement, and xenograft assays","pmids":["41237468"],"confidence":"Medium","gaps":["Single-lab, single-cancer-type observation","Direct mechanistic chain from ATF4 to ferroptosis effectors not fully mapped"]},{"year":null,"claim":"How DENR-MCTS1 achieves its codon- and uORF-context specificity—selecting which tRNAs to recruit or evict and which post-termination ribosomes to reinitiate—remains the central open mechanistic question.","evidence":"","pmids":[],"confidence":"High","gaps":["No structure of the tRNA-bound, post-termination reinitiation intermediate","Rules governing target mRNA selection not predictive","Mechanistic separation of recycling vs reinitiation in mammalian cells unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[2,6]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[0,5,11]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[2]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,7]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[1,4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0]}],"complexes":["DENR-MCTS1 heterodimer"],"partners":["MCTS1","EIF2D","AUF1","CDK1","CDK2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O43583","full_name":"Density-regulated protein","aliases":["Protein DRP1","Smooth muscle cell-associated protein 3","SMAP-3"],"length_aa":198,"mass_kda":22.1,"function":"Translation regulator forming a complex with MCTS1 to promote translation reinitiation. Translation reinitiation is the process where the small ribosomal subunit remains attached to the mRNA following termination of translation of a regulatory upstream ORF (uORF), and resume scanning on the same mRNA molecule to initiate translation of a downstream ORF, usually the main ORF (mORF). The MCTS1/DENR complex is pivotal to two linked mechanisms essential for translation reinitiation. Firstly, the dissociation of deacylated tRNAs from post-termination 40S ribosomal complexes during ribosome recycling. Secondly, the recruitment in an EIF2-independent manner of aminoacylated initiator tRNA to P site of 40S ribosomes for a new round of translation. This regulatory mechanism governs the translation of more than 150 genes which translation reinitiation is MCTS1/DENR complex-dependent","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O43583/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/DENR","classification":"Common Essential","n_dependent_lines":1097,"n_total_lines":1208,"dependency_fraction":0.9081125827814569},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DENR","total_profiled":1310},"omim":[{"mim_id":"604550","title":"DENSITY-REGULATED PROTEIN; DENR","url":"https://www.omim.org/entry/604550"},{"mim_id":"300587","title":"MALIGNANT T-CELL AMPLIFIED SEQUENCE 1; MCTS1","url":"https://www.omim.org/entry/300587"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DENR"},"hgnc":{"alias_symbol":["DRP","DRP1","SMAP-3"],"prev_symbol":[]},"alphafold":{"accession":"O43583","domains":[{"cath_id":"-","chopping":"40-71","consensus_level":"high","plddt":71.7472,"start":40,"end":71},{"cath_id":"3.30.780.10","chopping":"114-194","consensus_level":"high","plddt":74.1933,"start":114,"end":194}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43583","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43583-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43583-F1-predicted_aligned_error_v6.png","plddt_mean":62.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DENR","jax_strain_url":"https://www.jax.org/strain/search?query=DENR"},"sequence":{"accession":"O43583","fasta_url":"https://rest.uniprot.org/uniprotkb/O43583.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43583/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43583"}},"corpus_meta":[{"pmid":"25043021","id":"PMC_25043021","title":"DENR-MCT-1 promotes translation re-initiation downstream of uORFs to control tissue growth.","date":"2014","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/25043021","citation_count":150,"is_preprint":false},{"pmid":"32938922","id":"PMC_32938922","title":"DENR promotes translation reinitiation via ribosome recycling to drive expression of oncogenes including ATF4.","date":"2020","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/32938922","citation_count":74,"is_preprint":false},{"pmid":"32938929","id":"PMC_32938929","title":"Translational induction of ATF4 during integrated stress response requires noncanonical initiation factors eIF2D and DENR.","date":"2020","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/32938929","citation_count":73,"is_preprint":false},{"pmid":"30146315","id":"PMC_30146315","title":"Tma64/eIF2D, Tma20/MCT-1, and Tma22/DENR Recycle Post-termination 40S Subunits In Vivo.","date":"2018","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/30146315","citation_count":67,"is_preprint":false},{"pmid":"28723557","id":"PMC_28723557","title":"Crystal Structure of the Human Ribosome in Complex with DENR-MCT-1.","date":"2017","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/28723557","citation_count":52,"is_preprint":false},{"pmid":"35440133","id":"PMC_35440133","title":"DENR controls JAK2 translation to induce PD-L1 expression for tumor immune evasion.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/35440133","citation_count":49,"is_preprint":false},{"pmid":"28623304","id":"PMC_28623304","title":"Identification of transcripts with short stuORFs as targets for DENR•MCTS1-dependent translation in human cells.","date":"2017","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/28623304","citation_count":46,"is_preprint":false},{"pmid":"29889857","id":"PMC_29889857","title":"DENR-MCTS1 heterodimerization and tRNA recruitment are required for translation reinitiation.","date":"2018","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/29889857","citation_count":35,"is_preprint":false},{"pmid":"35115540","id":"PMC_35115540","title":"Cyclin B/CDK1 and Cyclin A/CDK2 phosphorylate DENR to promote mitotic protein translation and faithful cell division.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/35115540","citation_count":35,"is_preprint":false},{"pmid":"34016977","id":"PMC_34016977","title":"40S ribosome profiling reveals distinct roles for Tma20/Tma22 (MCT-1/DENR) and Tma64 (eIF2D) in 40S subunit recycling.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34016977","citation_count":32,"is_preprint":false},{"pmid":"27239039","id":"PMC_27239039","title":"De Novo Mutations in DENR Disrupt Neuronal Development and Link Congenital Neurological Disorders to Faulty mRNA Translation Re-initiation.","date":"2016","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/27239039","citation_count":30,"is_preprint":false},{"pmid":"30982898","id":"PMC_30982898","title":"Charting DENR-dependent translation reinitiation uncovers predictive uORF features and links to circadian timekeeping via Clock.","date":"2019","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/30982898","citation_count":27,"is_preprint":false},{"pmid":"30584092","id":"PMC_30584092","title":"Crystal structure of the DENR-MCT-1 complex revealed zinc-binding site essential for heterodimer formation.","date":"2018","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/30584092","citation_count":19,"is_preprint":false},{"pmid":"17878526","id":"PMC_17878526","title":"Post-transcriptional control of the MCT-1-associated protein DENR/DRP by RNA-binding protein AUF1.","date":"2007","source":"Cancer genomics & proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/17878526","citation_count":12,"is_preprint":false},{"pmid":"38433101","id":"PMC_38433101","title":"To initiate or not to initiate: A critical assessment of eIF2A, eIF2D, and MCT-1·DENR to deliver initiator tRNA to ribosomes.","date":"2024","source":"Wiley interdisciplinary reviews. 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Biokhimiia","url":"https://pubmed.ncbi.nlm.nih.gov/41354083","citation_count":0,"is_preprint":false},{"pmid":"41279288","id":"PMC_41279288","title":"Gene model for the ortholog of DENR in Drosophila simulans.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/41279288","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.10.13.682112","title":"Gene model for the ortholog of  <i>DENR</i>  in  <i>Drosophila simulans</i>","date":"2025-10-14","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.13.682112","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.03.680283","title":"Identification of key host genes for influenza A virus in avian cells using a genome-wide CRISPR-Cas9 screen","date":"2025-10-05","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.03.680283","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12231,"output_tokens":3876,"usd":0.047417,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11586,"output_tokens":4271,"usd":0.082352,"stage2_stop_reason":"end_turn"},"total_usd":0.129769,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2014,\n      \"finding\": \"DENR and MCT-1 (MCTS1) form a heterodimeric complex that selectively promotes translation re-initiation after upstream ORFs (uORFs) with strong Kozak sequences, without affecting standard cap-dependent translation initiation. mRNAs containing stuORFs constitute a novel co-regulated class enriched for oncogenic kinases.\",\n      \"method\": \"Genetic knockdown/knockout in Drosophila and human cells, polysome profiling, reporter assays, ribosome profiling\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (genetic KO, polysome profiling, reporter assays) replicated across organisms and labs\",\n      \"pmids\": [\"25043021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structure of human DENR-MCT-1 bound to the small (40S) ribosomal subunit revealed that the C-terminal domain of DENR occupies a binding site on the ribosome strikingly similar to that of canonical initiation factor eIF1, which controls translation fidelity and scanning, while MCT-1 contacts helix h24 of 18S rRNA.\",\n      \"method\": \"X-ray crystallography of human 40S ribosomal subunit in complex with DENR-MCT-1\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional implications, rigorously determined at defined resolution\",\n      \"pmids\": [\"28723557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of MCTS1 bound to the N-terminal domain of DENR revealed that DENR residues Glu42, Tyr43, and Tyr46 are critical for MCTS1 binding, and MCTS1 residue Phe104 is critical for tRNA binding. Both DENR-MCTS1 dimerization and tRNA binding are required for translation reinitiation activity in human cells. DENR-MCTS1 can bind tRNA independently of the ribosome, suggesting it recruits tRNA to the ribosome analogously to eIF2.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, in vivo translation reinitiation reporter assays, biochemical tRNA binding assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and functional validation in a single rigorous study\",\n      \"pmids\": [\"29889857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of the human MCT-1/DENR N-terminal domain heterodimer at 2.0 Å revealed that four conserved DENR cysteines (C34, C37, C44, C53) form a classical tetrahedral zinc ion-binding site essential for maintaining the MCT-1-binding interface; substitution of all four cysteines with alanine abolished heterodimer formation.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, biochemical dimerization assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure combined with mutagenesis demonstrating functional requirement\",\n      \"pmids\": [\"30584092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In yeast, Tma22 (DENR ortholog), Tma20 (MCT-1 ortholog), and Tma64 (eIF2D ortholog) function as 40S ribosomal subunit recycling factors in vivo at stop codons; deletion of these genes causes 80S ribosomes to queue at stop codons and enables aberrant reinitiation including at 3' UTR AUG codons.\",\n      \"method\": \"Ribosome profiling of yeast tma deletion strains, 3' UTR reporter assays, in vitro translation\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ribosome profiling with multiple orthogonal validations (reporter assays, in vitro translation) establishing in vivo recycling role\",\n      \"pmids\": [\"30146315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DENR and MCTS1 are required for translational induction of ATF4 upon cellular stress by promoting translation reinitiation in the ATF4 5' UTR. DENR and MCTS1 are specifically needed for reinitiation after uORFs containing certain penultimate codons, suggesting they are required to evict specific tRNAs from post-termination 40S ribosomes.\",\n      \"method\": \"DENR/MCTS1 knockdown in human cells, polysome profiling, ATF4 reporter assays, ribosome profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated independently across two labs (PMIDs 32938922 and 32938929) using KD and reporter assays\",\n      \"pmids\": [\"32938922\", \"32938929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DENR and eIF2D are required for ATF4 translational induction in the integrated stress response in Drosophila and human cells. Loss of eIF2D and DENR in Drosophila causes increased vulnerability to amino acid deprivation and ER stress phenotypes similar to ATF4 mutants. eIF2D requires its RNA-binding motif for regulation of 5' leader-mediated ATF4 translation.\",\n      \"method\": \"Drosophila genetics (loss-of-function), human cell knockdown, ATF4 5' UTR reporter assays, RNA-binding domain mutagenesis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in Drosophila plus human cell validation with domain mutagenesis, two independent labs converging\",\n      \"pmids\": [\"32938929\", \"32938922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Crystal structure of the C-terminal domain of DENR at 1.74 Å resolution confirmed its structural resemblance to eIF1, consistent with its binding site on the ribosome near the P site and its role in initiation codon selection and scanning.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Computational and structural biotechnology journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure, single lab but structurally rigorous\",\n      \"pmids\": [\"32257053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In yeast, the Tma20/Tma22 (MCT-1/DENR) heterodimer is responsible for the majority of 40S ribosomal subunit recycling events at stop codons, while Tma64 (eIF2D) plays only a minor role. An autism-associated mutation in TMA22 (DENR) causes loss of 40S recycling activity, directly linking ribosome recycling to neurological disease.\",\n      \"method\": \"40S ribosome footprinting (selective ribosome profiling), yeast deletion and point-mutant strains\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dedicated 40S footprinting approach directly observing recycling intermediates, complemented by disease-relevant mutagenesis\",\n      \"pmids\": [\"34016977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DENR, together with its binding partner MCTS1, is required for cortical neuron migration and dendritic arborization in vivo. De novo missense mutations in DENR (p.C37Y and p.P121L) found in patients with brain developmental disorders impair DENR function in mRNA translation re-initiation and disrupt cortical neuron migration and terminal branching.\",\n      \"method\": \"In utero electroporation in mice (loss-of-function), human patient variant characterization, translation re-initiation reporter assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse experiments combined with functional validation of human disease variants\",\n      \"pmids\": [\"27239039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In human cells, DENR and MCTS1 selectively promote translation of mRNAs with very short stuORFs (coding for 1 amino acid), identifying approximately 100 target genes enriched for neuronal genes and G protein-coupled receptors.\",\n      \"method\": \"DENR/MCTS1 knockdown, polysome profiling, ribosome footprinting, reporter assays in human cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide translational profiling in human cells, single lab\",\n      \"pmids\": [\"28623304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DENR promotes translation reinitiation on the Clock mRNA via a specific uORF in its 5' UTR, thereby regulating CLOCK protein biosynthesis and influencing circadian period length in mouse fibroblasts. DENR depletion shortens circadian period.\",\n      \"method\": \"Ribosome profiling in DENR-deficient NIH3T3 cells, Clock 5' UTR mutant reporter assays, circadian period measurement\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ribosome profiling combined with 5' UTR mutagenesis and functional circadian assay\",\n      \"pmids\": [\"30982898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DENR is phosphorylated on Serine 73 by Cyclin B/CDK1 and Cyclin A/CDK2 at the onset of mitosis and dephosphorylated as cells exit mitosis. Ser73 phosphorylation promotes DENR protein stability by preventing cleavage at Asp26, leading to enhanced translation of mitotically relevant mRNAs (~40% of translationally upregulated mitotic mRNAs are DENR targets). Absence of DENR or Ser73 phosphorylation causes elevated aberrant mitoses and cell death.\",\n      \"method\": \"Cell synchronization, phospho-specific antibodies, CDK inhibitor and mutagenesis experiments, ribosome profiling in mitotic cells, live-cell imaging\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including phospho-mutagenesis, ribosome profiling, and cellular phenotyping in a single study\",\n      \"pmids\": [\"35115540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DENR promotes JAK2 translation by antagonizing translational repression mediated by three consecutive uORFs in the Jak2 5' UTR. DENR deficiency impairs JAK2 protein expression, reduces IFNγ-JAK-STAT signaling, and consequently decreases PD-L1 expression, thereby reducing tumor immune evasion.\",\n      \"method\": \"CRISPR/Cas9 screening, DENR knockdown/knockout in cancer cells, JAK2 uORF reporter assays, in vivo tumor models, FACS for PD-L1 and CD8+ T cell activity\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR screen plus mechanistic validation with uORF reporters and in vivo tumor models\",\n      \"pmids\": [\"35440133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"AUF1 RNA-binding protein binds to discrete ARE-containing regions in the DENR mRNA 3' UTR in a cell-density-dependent manner, and AUF1 silencing increases DENR protein levels, establishing post-transcriptional regulation of DENR expression.\",\n      \"method\": \"RNA immunoprecipitation, Western blotting, AUF1 shRNA knockdown in HEK293 cells\",\n      \"journal\": \"Cancer genomics & proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — RNA-IP and KD showing regulatory interaction, single lab with two methods but indirect functional link\",\n      \"pmids\": [\"17878526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DENR promotes ATF4 expression via uORF-mediated translational reinitiation, and DENR-driven ATF4 signaling inhibits ferroptosis in esophageal squamous cell carcinoma cells, reducing cisplatin sensitivity. Silencing ATF4 partially reverses DENR-mediated ferroptosis inhibition and DDP resistance.\",\n      \"method\": \"DENR overexpression and knockdown, ATF4 knockdown epistasis, ROS/Fe2+ measurement, in vivo xenograft tumor assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis experiment (DENR + ATF4 double knockdown) with cellular and in vivo phenotyping, single lab\",\n      \"pmids\": [\"41237468\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DENR forms a stable heterodimer with MCTS1 (MCT-1) via a zinc-coordinated N-terminal interface; the complex binds the 40S ribosomal subunit through contacts with 18S rRNA, where the C-terminal domain of DENR occupies an eIF1-like position near the P site, and DENR·MCTS1 recruits tRNA to post-termination 40S ribosomes to selectively promote translation reinitiation downstream of short upstream ORFs—a process phosphoregulated by Cyclin B/CDK1 and Cyclin A/CDK2 during mitosis—thereby controlling translation of a subset of mRNAs including ATF4, JAK2, oncogenic kinases, and circadian clock components, with loss of this activity causing neuronal migration defects and aberrant cell division.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DENR is a translational reinitiation factor that, in heterodimer with MCTS1 (MCT-1), selectively promotes translation of mRNAs whose 5' leaders contain short upstream ORFs, without affecting bulk cap-dependent initiation [#0]. The two subunits dimerize through a zinc-coordinated N-terminal interface: four conserved DENR cysteines (C34, C37, C44, C53) form a tetrahedral zinc site required for heterodimer formation, and DENR residues Glu42/Tyr43/Tyr46 contact MCTS1 [#2, #3]. The assembled complex docks on the 40S ribosomal subunit, with MCTS1 contacting helix h24 of 18S rRNA while the C-terminal domain of DENR occupies a site near the P site closely resembling that of initiation factor eIF1, consistent with a role in start-codon selection and scanning [#1, #7]. Functionally, DENR-MCTS1 binds and delivers tRNA to post-termination 40S ribosomes—analogous to eIF2—enabling reinitiation downstream of uORFs and acting in 40S ribosomal subunit recycling at stop codons, as established for the yeast orthologs Tma22/Tma20 [#2, #4, #8]. Through this activity DENR controls a defined set of target mRNAs, including the stress-responsive transcription factor ATF4 [#5, #6], the kinase JAK2 (thereby tuning IFNγ-JAK-STAT signaling and PD-L1-mediated tumor immune evasion) [#13], and the circadian gene Clock [#11]. DENR activity is cell-cycle regulated: Cyclin B/CDK1 and Cyclin A/CDK2 phosphorylate DENR on Ser73 at mitotic onset, stabilizing the protein by blocking cleavage at Asp26 and driving translation of mitotic mRNAs, with loss of DENR or Ser73 phosphorylation causing aberrant mitoses [#12]. De novo missense mutations in DENR (p.C37Y, p.P121L) impair reinitiation activity and disrupt cortical neuron migration and dendritic branching, linking the factor to human brain developmental disorders [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Established that DENR-MCTS1 defines a dedicated reinitiation pathway distinct from canonical cap-dependent initiation, answering whether a specific factor controls post-uORF translation.\",\n      \"evidence\": \"Genetic knockdown/knockout in Drosophila and human cells with polysome profiling, ribosome profiling, and reporter assays\",\n      \"pmids\": [\"25043021\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of stuORF selectivity not defined\", \"Structural mechanism of 40S engagement not yet resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected DENR reinitiation activity to an in vivo developmental process and to human disease, showing the factor is required for cortical neuron migration and that patient mutations impair its function.\",\n      \"evidence\": \"In utero electroporation in mice plus characterization of human p.C37Y/p.P121L variants in reinitiation reporter assays\",\n      \"pmids\": [\"27239039\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific neuronal target mRNAs driving the migration phenotype not fully defined\", \"Whether mutations act via heterodimer disruption vs ribosome binding unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved how DENR-MCTS1 sits on the ribosome and defined its target spectrum, showing DENR mimics eIF1 at a P-site-proximal location and selectively promotes very short stuORF-containing mRNAs.\",\n      \"evidence\": \"X-ray crystallography of the human 40S-DENR-MCT-1 complex; knockdown plus ribosome footprinting and reporter assays in human cells\",\n      \"pmids\": [\"28723557\", \"28623304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Target set size and tissue specificity vary between studies\", \"Functional consequence of eIF1-like positioning during scanning not directly tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the molecular architecture of the heterodimer and its tRNA-delivery function, showing a zinc-coordinated interface and that both dimerization and ribosome-independent tRNA binding are required for reinitiation.\",\n      \"evidence\": \"Crystal structures of MCTS1-DENR N-terminal domain with site-directed mutagenesis, dimerization assays, and tRNA-binding and reinitiation reporter assays\",\n      \"pmids\": [\"29889857\", \"30584092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity/selectivity of recruited tRNAs not fully mapped\", \"How tRNA hand-off to the 40S P site occurs structurally unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reframed the orthologous complex as a 40S ribosome recycling factor, showing that deletion of Tma22/Tma20/Tma64 causes 80S queuing at stop codons and aberrant reinitiation.\",\n      \"evidence\": \"Ribosome profiling of yeast tma deletion strains, 3' UTR reporter assays, and in vitro translation\",\n      \"pmids\": [\"30146315\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of recycling vs reinitiation in mammalian cells not delineated\", \"Stop-codon recognition step mechanism not detailed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked DENR reinitiation to circadian timekeeping by showing it controls CLOCK protein output through a Clock 5' UTR uORF.\",\n      \"evidence\": \"Ribosome profiling in DENR-deficient NIH3T3 cells, Clock 5' UTR mutant reporters, and circadian period measurement\",\n      \"pmids\": [\"30982898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DENR-dependent CLOCK regulation operates in vivo across tissues unknown\", \"Magnitude of contribution relative to other clock inputs unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established DENR (with MCTS1 and eIF2D) as required for ATF4 induction in the integrated stress response, defining a codon-specific tRNA-eviction requirement for reinitiation.\",\n      \"evidence\": \"Knockdown in human cells and Drosophila genetics, ATF4 5' UTR reporters, ribosome profiling, and RNA-binding domain mutagenesis of eIF2D, converging across two labs\",\n      \"pmids\": [\"32938922\", \"32938929\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of penultimate-codon-dependent tRNA eviction not structurally defined\", \"Functional division of labor between DENR-MCTS1 and eIF2D incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Confirmed the eIF1-like architecture of the DENR C-terminal domain in isolation, reinforcing its role in initiation codon selection and scanning.\",\n      \"evidence\": \"High-resolution X-ray crystallography of the DENR C-terminal domain\",\n      \"pmids\": [\"32257053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demonstration of eIF1-like activity in fidelity control not provided\", \"Single-lab structure\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Directly observed recycling intermediates to show the MCT-1/DENR dimer drives the majority of 40S recycling events, and tied an autism-associated TMA22 mutation to loss of this activity.\",\n      \"evidence\": \"40S selective ribosome footprinting of yeast deletion and point-mutant strains\",\n      \"pmids\": [\"34016977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demonstration in mammalian neurons not performed\", \"Mechanistic link from recycling defect to neurological phenotype indirect\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified cell-cycle phosphoregulation of DENR, showing Cyclin B/CDK1 and Cyclin A/CDK2 phosphorylate Ser73 to stabilize DENR and drive mitotic translation, with loss causing aberrant mitoses.\",\n      \"evidence\": \"Cell synchronization, phospho-specific antibodies, CDK inhibition and phospho-mutagenesis, mitotic ribosome profiling, and live-cell imaging\",\n      \"pmids\": [\"35115540\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protease responsible for Asp26 cleavage not identified\", \"How phosphorylation alters ribosome engagement unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated a cancer-immunology consequence of DENR reinitiation, showing it relieves uORF repression of JAK2 to sustain IFNγ-JAK-STAT signaling and PD-L1-mediated immune evasion.\",\n      \"evidence\": \"CRISPR/Cas9 screening, knockdown/knockout in cancer cells, JAK2 uORF reporters, in vivo tumor models, and FACS for PD-L1 and CD8+ T-cell activity\",\n      \"pmids\": [\"35440133\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality across tumor types not established\", \"Direct DENR occupancy on Jak2 5' UTR not structurally shown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended DENR-ATF4 control to a survival pathway, showing DENR-driven ATF4 signaling suppresses ferroptosis and reduces cisplatin sensitivity in esophageal squamous cell carcinoma.\",\n      \"evidence\": \"DENR overexpression/knockdown with ATF4 knockdown epistasis, ROS/Fe2+ measurement, and xenograft assays\",\n      \"pmids\": [\"41237468\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab, single-cancer-type observation\", \"Direct mechanistic chain from ATF4 to ferroptosis effectors not fully mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DENR-MCTS1 achieves its codon- and uORF-context specificity—selecting which tRNAs to recruit or evict and which post-termination ribosomes to reinitiate—remains the central open mechanistic question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of the tRNA-bound, post-termination reinitiation intermediate\", \"Rules governing target mRNA selection not predictive\", \"Mechanistic separation of recycling vs reinitiation in mammalian cells unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [0, 5, 11]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [1, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-72766\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"DENR-MCTS1 heterodimer\"],\n    \"partners\": [\"MCTS1\", \"EIF2D\", \"AUF1\", \"CDK1\", \"CDK2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}