{"gene":"DDX50","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":2022,"finding":"DDX50 is a viral restriction factor that promotes IRF3 signalling pathway activation following stimulation with viral RNA or infection with RNA and DNA viruses. Deletion of DDX50 in mouse and human cells impaired IRF3 phosphorylation and IRF3-dependent endogenous gene expression and cytokine/chemokine production in response to cytoplasmic dsRNA (polyIC transfection) and infection by RNA and DNA viruses. Mechanistically, DDX50 co-immunoprecipitated TRIF but acted independently of the previously described TRIF-dependent RNA sensor DDX1. Loss of DDX50 resulted in increased replication of vaccinia virus, herpes simplex virus, and Zika virus.","method":"CRISPR/shRNA deletion in mouse and human cells, co-immunoprecipitation, IRF3 phosphorylation assays, cytokine/chemokine measurement, viral replication assays","journal":"Viruses","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KO, Co-IP, functional readouts) in both mouse and human cells with rigorous controls","pmids":["35215908"],"is_preprint":false},{"year":2017,"finding":"DDX50 inhibits dengue virus 2 (DENV-2) replication during early infection by upregulating IFN-β production. DDX50 knockdown increased DENV-2 RNA levels while overexpression decreased them. DDX50 cooperated additively with RIG-I and MDA5 to upregulate the IFN-β promoter in infected cells, and DDX50 overexpression increased transcription of IFN-stimulated genes.","method":"siRNA knockdown, overexpression, IFN-β promoter reporter assay, qRT-PCR for viral RNA and ISGs","journal":"Archives of virology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods (KD, OE, reporter assay) in single lab","pmids":["28181036"],"is_preprint":false},{"year":2017,"finding":"DDX50 promotes Hantaan virus (HTNV) replication, in contrast to DDX21 and DDX60 which reinforce IFN responses and exert anti-hantaviral effects, suggesting DDX50 has a pro-viral role in the context of HTNV infection.","method":"In-cell Western assay to measure viral protein expression following shRNA-mediated knockdown of DExD/H-box helicase family members","journal":"Frontiers in cellular and infection microbiology","confidence":"Low","confidence_rationale":"Tier 3 — single method (ICW assay), limited mechanistic follow-up, single lab","pmids":["28676847"],"is_preprint":false},{"year":2025,"finding":"DDX37 and DDX50 maintain genome stability by resolving transcription-dependent R-loops (RNA-DNA hybrids). Depletion of DDX50 promotes DNA damage (H2AX phosphorylation, increased comet tail length), decreases DNA replication track length, and induces RPA focus formation indicative of replication stress. DDX50 depletion increases RNA-DNA hybrids, which can be rescued by RNase H1 overexpression. Inhibition of transcription prevented the increased RNA-DNA hybrid formation and DNA damage upon DDX50 depletion.","method":"siRNA knockdown, H2AX phosphorylation assay, comet assay, DNA fiber assay, RPA focus formation, S9.6 antibody-based RNA-DNA hybrid detection, RNase H1 rescue, transcription inhibition","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with mechanistic rescue experiments (RNase H1, transcription inhibition) demonstrating pathway placement","pmids":["40043837"],"is_preprint":false},{"year":2025,"finding":"Glucose binding to conserved ATP-binding sequences of DDX50 alters protein conformation and dissociates DDX50 dimers into monomers. DDX50 monomers bind STAU1 and redirect it from an RNA-decay-promoting complex with UPF1 to a DDX50-STAU1 ribonuclear complex. This DDX50-STAU1 complex binds and stabilizes a set of pro-differentiation RNAs (including JUN, OVOL1, CEBPB, PRDM1, and TINCR) and modifies their structures. DDX50 was found essential for the differentiation of diverse cell types.","method":"Glucose-binding assays, conformation analysis, co-immunoprecipitation, RNA immunoprecipitation, RNA structure probing, loss-of-function differentiation assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including biochemical reconstitution of glucose-binding effect on oligomerization, Co-IP, RNA binding and structure assays, and functional differentiation readouts","pmids":["39764852"],"is_preprint":false},{"year":2024,"finding":"DDX50 contains a Pro/N-degron and is identified as an interactor of GID4, the substrate receptor of the CTLH E3 ubiquitin ligase complex. DDX50 was enriched in proximity-dependent biotinylation and quantitative proteomics experiments using the GID4 chemical probe PFI-7, suggesting DDX50 is subject to GID4-mediated regulation (degradative or non-degradative).","method":"Proximity-dependent biotinylation (BioID), quantitative proteomics, chemical probe (PFI-7) antagonizing Pro/N-degron binding to GID4","journal":"Nature chemical biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — identified by proteomics with chemical probe validation, but direct functional consequence for DDX50 not fully resolved","pmids":["38773330"],"is_preprint":false},{"year":2005,"finding":"DDX50 was identified as a component of the human nucleolar proteome. Its abundance in the nucleolus changes in response to metabolic inhibitors that affect nucleolar morphology, indicating it is a dynamically associated nucleolar protein.","method":"Mass spectrometry-based organellar proteomics, stable isotope labelling (SILAC), quantitative analysis of nucleolar protein flux","journal":"Nature","confidence":"Medium","confidence_rationale":"Tier 2 — quantitative proteomics with metabolic inhibitor perturbation; localization established by fractionation and MS","pmids":["15635413"],"is_preprint":false},{"year":2002,"finding":"DDX50 was identified as a nucleolar protein in a proteomic analysis of human nucleoli, supporting its localization to this subnuclear compartment.","method":"Mass spectrometry-based proteomic analysis of isolated nucleoli from HeLa cells","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 — direct biochemical fractionation and MS identification; replicated across multiple nucleolar proteome studies","pmids":["11790298"],"is_preprint":false},{"year":2012,"finding":"DDX50 was identified as an mRNA-binding protein in HeLa cells through UV crosslinking of RNA-binding proteins to mRNA followed by oligo(dT) purification and mass spectrometry (interactome capture), establishing it as a member of the mRNA-bound proteome.","method":"UV crosslinking, oligo(dT) purification, quantitative mass spectrometry (interactome capture)","journal":"Cell","confidence":"Medium","confidence_rationale":"Tier 2 — direct covalent crosslinking biochemical method; large-scale systematic study","pmids":["22658674"],"is_preprint":false}],"current_model":"DDX50 is a nucleolar DExD/H-box RNA helicase and mRNA-binding protein that functions as a broad-spectrum antiviral restriction factor by promoting IRF3 phosphorylation and IFN-β production via TRIF-dependent signalling (independently of DDX1), resolves transcription-dependent R-loops to prevent DNA damage and replication stress, and undergoes glucose-induced monomerization to form a DDX50-STAU1 complex that stabilizes pro-differentiation mRNAs by antagonizing Staufen-mediated mRNA decay; additionally, DDX50 contains a Pro/N-degron recognized by the CTLH E3 ligase substrate receptor GID4."},"narrative":{"teleology":[{"year":2002,"claim":"Establishing where DDX50 resides was a prerequisite for understanding its function; proteomic mapping placed it in the nucleolus, implicating it in RNA-related nuclear processes.","evidence":"Mass spectrometry of isolated HeLa nucleoli","pmids":["11790298"],"confidence":"Medium","gaps":["No functional role assigned at this stage","Nucleolar localization confirmed by fractionation-MS but not by imaging"]},{"year":2005,"claim":"Quantitative nucleolar proteomics revealed DDX50 is dynamically associated with the nucleolus, with its abundance changing upon metabolic perturbation, suggesting regulated shuttling rather than static residence.","evidence":"SILAC-based quantitative proteomics of nucleolar fractions under actinomycin D treatment","pmids":["15635413"],"confidence":"Medium","gaps":["Signals driving nucleolar retention or release unknown","Functional consequence of redistribution not tested"]},{"year":2012,"claim":"UV-crosslinking interactome capture identified DDX50 as a direct mRNA-binding protein, extending its substrate repertoire beyond ribosomal RNA processing expectations for a nucleolar helicase.","evidence":"UV crosslinking and oligo(dT) capture followed by mass spectrometry in HeLa cells","pmids":["22658674"],"confidence":"Medium","gaps":["Specific mRNA targets not identified","Whether mRNA binding is functionally consequential was unknown"]},{"year":2017,"claim":"The first functional role for DDX50 emerged in antiviral immunity: DDX50 restricted dengue virus replication by promoting IFN-β production, cooperating additively with RIG-I and MDA5, placing it in the innate immune sensing pathway.","evidence":"siRNA knockdown and overexpression with IFN-β reporter assays and ISG qRT-PCR during DENV-2 infection","pmids":["28181036"],"confidence":"Medium","gaps":["Signalling adaptor through which DDX50 operated was not identified","A separate study reported a pro-viral role for DDX50 during hantavirus infection, raising context-dependency questions (PMID:28676847)"]},{"year":2022,"claim":"The mechanistic basis of DDX50's antiviral function was resolved: DDX50 interacts with TRIF to promote IRF3 phosphorylation independently of DDX1, establishing it as a bona fide restriction factor against both RNA and DNA viruses.","evidence":"CRISPR knockout in mouse and human cells, co-immunoprecipitation with TRIF, IRF3 phosphorylation and cytokine assays, viral replication assays for vaccinia, HSV, and Zika viruses","pmids":["35215908"],"confidence":"High","gaps":["Direct RNA-sensing activity versus adaptor role not biochemically resolved","Crystal or cryo-EM structure of DDX50–TRIF complex unavailable"]},{"year":2024,"claim":"Identification of a Pro/N-degron in DDX50 recognized by the CTLH E3 ligase receptor GID4 revealed a potential ubiquitin-dependent regulatory mechanism controlling DDX50 turnover.","evidence":"BioID proximity biotinylation and quantitative proteomics with chemical probe PFI-7","pmids":["38773330"],"confidence":"Medium","gaps":["Whether GID4 binding leads to DDX50 degradation or non-degradative ubiquitination not resolved","Physiological conditions triggering GID4-mediated regulation unknown"]},{"year":2025,"claim":"A genome maintenance role was uncovered: DDX50 resolves transcription-dependent R-loops, and its depletion causes DNA damage and replication stress that is rescued by RNase H1, establishing DDX50 as a guardian of genome integrity.","evidence":"siRNA depletion with γH2AX, comet assay, DNA fiber analysis, S9.6 antibody detection of R-loops, RNase H1 rescue, transcription inhibition rescue","pmids":["40043837"],"confidence":"High","gaps":["Whether R-loop resolution uses the same helicase activity as mRNA-related functions is unclear","Relationship to DDX37, which shares R-loop resolution activity, not mechanistically dissected"]},{"year":2025,"claim":"A metabolic sensing mechanism was revealed: glucose binds DDX50 at its ATP-binding cassettes, triggering dimer-to-monomer conversion that enables formation of a DDX50–STAU1 complex, which stabilizes pro-differentiation mRNAs by sequestering STAU1 from UPF1-dependent decay.","evidence":"Glucose-binding assays, oligomerization analysis, co-immunoprecipitation, RNA immunoprecipitation, RNA structure probing, differentiation assays in multiple cell types","pmids":["39764852"],"confidence":"High","gaps":["Whether glucose-dependent monomerization also regulates DDX50's antiviral or R-loop resolution activities is unknown","Structural basis of glucose binding to the ATP-binding cassette not determined"]},{"year":null,"claim":"Key unresolved questions include whether DDX50's distinct functions — innate immune signalling, R-loop resolution, and mRNA stabilization — are coordinated or independently regulated, and what structural features allow glucose and ATP to differentially modulate its activity.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of DDX50 in any functional state","Crosstalk between antiviral, genome stability, and mRNA decay functions untested","In vivo phenotyping in DDX50-null organisms not reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[4,8]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[3,4]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[6,7]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,6,7]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[3]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[4,8]}],"complexes":[],"partners":["TRIF","STAU1","UPF1","GID4"],"other_free_text":[]},"mechanistic_narrative":"DDX50 is a nucleolar DExD/H-box RNA helicase that functions at the intersection of innate immunity, genome maintenance, and mRNA metabolism. It promotes type I interferon responses by facilitating IRF3 phosphorylation and IFN-β production through a TRIF-dependent, DDX1-independent pathway, thereby restricting replication of diverse RNA and DNA viruses [PMID:35215908, PMID:28181036]. DDX50 resolves transcription-dependent R-loops to prevent DNA damage and replication stress, as demonstrated by rescue of DDX50-depletion phenotypes with RNase H1 overexpression or transcription inhibition [PMID:40043837]. Glucose-induced dissociation of DDX50 dimers into monomers enables formation of a DDX50–STAU1 ribonucleoprotein complex that antagonizes Staufen-mediated mRNA decay and stabilizes pro-differentiation transcripts, making DDX50 essential for cellular differentiation programs [PMID:39764852]."},"prefetch_data":{"uniprot":{"accession":"Q9BQ39","full_name":"ATP-dependent RNA helicase DDX50","aliases":["DEAD box protein 50","Gu-beta","Nucleolar protein Gu2"],"length_aa":737,"mass_kda":82.6,"function":"ATP-dependent RNA helicase that may play a role in various aspects of RNA metabolism including pre-mRNA splicing or ribosomal RNA production (PubMed:12027455). Also acts as a viral restriction factor and promotes the activation of the NF-kappa-B and IRF3 signaling pathways following its stimulation with viral RNA or infection with RNA and DNA viruses (PubMed:35215908). For instance, decreases vaccinia virus, herpes simplex virus, Zika virus or dengue virus replication during the early stage of infection (PubMed:28181036, PubMed:35215908). Mechanistically, acts via the adapter TICAM1 and independently of the DDX1-DDX21-DHX36 helicase complex to induce the production of interferon-beta (PubMed:35215908)","subcellular_location":"Nucleus, nucleolus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9BQ39/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DDX50","classification":"Not Classified","n_dependent_lines":24,"n_total_lines":1208,"dependency_fraction":0.019867549668874173},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CPSF6","stoichiometry":0.2},{"gene":"DDX21","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/DDX50","total_profiled":1310},"omim":[{"mim_id":"610373","title":"DExD-BOX HELICASE 50; DDX50","url":"https://www.omim.org/entry/610373"},{"mim_id":"606357","title":"DExD-BOX HELICASE 21; DDX21","url":"https://www.omim.org/entry/606357"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoli","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DDX50"},"hgnc":{"alias_symbol":["GU2","MGC3199","GUB","RH-II/GuB"],"prev_symbol":[]},"alphafold":{"accession":"Q9BQ39","domains":[{"cath_id":"3.40.50.300","chopping":"132-348","consensus_level":"high","plddt":89.809,"start":132,"end":348},{"cath_id":"3.40.50.300","chopping":"361-517","consensus_level":"high","plddt":87.204,"start":361,"end":517},{"cath_id":"-","chopping":"521-535_543-569","consensus_level":"high","plddt":88.5379,"start":521,"end":569},{"cath_id":"3.30.70.2280","chopping":"586-655","consensus_level":"high","plddt":82.919,"start":586,"end":655}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BQ39","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BQ39-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BQ39-F1-predicted_aligned_error_v6.png","plddt_mean":72.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DDX50","jax_strain_url":"https://www.jax.org/strain/search?query=DDX50"},"sequence":{"accession":"Q9BQ39","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BQ39.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BQ39/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BQ39"}},"corpus_meta":[{"pmid":"10233949","id":"PMC_10233949","title":"Characterization 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TRIF and was required for IRF3 phosphorylation and IRF3-dependent cytokine/chemokine production. Loss of DDX50 in mouse and human cells impaired innate immune responses to cytoplasmic dsRNA (polyIC), RNA viruses, and DNA viruses, and increased replication and dissemination of vaccinia virus, HSV, and Zika virus. DDX50 acted independently of the DDX1-TRIF RNA sensing axis.\",\n      \"method\": \"CRISPR/shRNA knockout in mouse and human cells, co-immunoprecipitation (TRIF), IRF3 phosphorylation assays, viral replication assays, cytokine/chemokine measurement\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular and molecular phenotype, reciprocal Co-IP, multiple orthogonal methods in one study\",\n      \"pmids\": [\"35215908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DDX50 inhibits dengue virus 2 (DENV-2) replication by cooperating with RIG-I and MDA5 to upregulate IFN-β production through an additive effect on the IFN-β promoter; DDX50 knockdown increased DENV-2 RNA levels early in infection, while overexpression decreased viral RNA and increased transcription of IFN-stimulated genes.\",\n      \"method\": \"shRNA knockdown and overexpression in cell culture, DENV-2 RNA quantification (qRT-PCR), IFN-β promoter reporter assay, IFN-stimulated gene expression analysis\",\n      \"journal\": \"Archives of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with defined molecular phenotype and promoter assay, single lab\",\n      \"pmids\": [\"28181036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Glucose binding to conserved ATP-binding sequences in DDX50 alters its protein conformation and dissociates DDX50 dimers into monomers; DDX50 monomers then bind STAU1 to redirect it away from a UPF1-mediated RNA decay complex toward a DDX50-STAU1 ribonuclear complex that binds, stabilizes, and remodels the structures of pro-differentiation mRNAs (including JUN, OVOL1, CEBPB, PRDM1, and TINCR), and DDX50 is essential for differentiation of diverse cell types.\",\n      \"method\": \"Glucose-binding assays, protein conformation analysis, co-immunoprecipitation (STAU1, UPF1), loss-of-function in multiple cell types with differentiation readouts, RNA immunoprecipitation/stability assays, RNA structure probing\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (biochemical binding, Co-IP, RNA stability, structural analysis, KO phenotype) in single study\",\n      \"pmids\": [\"39764852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DDX50 (and DDX37) prevent transcription-dependent R-loop formation and thereby maintain genome stability; depletion of DDX50 causes DNA damage (H2AX phosphorylation, increased comet tail length), replication stress (shortened DNA replication tracks, RPA focus formation), and increased RNA-DNA hybrid accumulation that is reversed by RNase H1 overexpression. Transcription inhibition prevented DNA damage and RNA-DNA hybrid accumulation upon DDX50 depletion.\",\n      \"method\": \"shRNA knockdown, H2AX phosphorylation assay, comet assay, DNA fiber assay, RPA focus immunofluorescence, RNA-DNA hybrid immunofluorescence (S9.6), RNase H1 rescue, transcription inhibition rescue\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (DNA damage markers, replication stress, RNA-DNA hybrids, RNase H rescue, transcription inhibition rescue) with clean KD\",\n      \"pmids\": [\"40043837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DDX50 is a substrate-receptor interactor of the CTLH E3 ubiquitin ligase complex via GID4: proximity-dependent biotinylation and quantitative proteomics using the GID4 chemical probe PFI-7 identified DDX50 (along with DDX21) as a Pro/N-degron-containing nucleolar protein that interacts with GID4.\",\n      \"method\": \"Chemical probe (PFI-7) antagonism of GID4 Pro/N-degron binding, proximity-dependent biotinylation (BioID), quantitative proteomics\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — chemical probe + proximity proteomics, single study; identifies interaction but degradation vs. non-degradative function not fully resolved for DDX50\",\n      \"pmids\": [\"38773330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DDX50 was found to promote Hantaan virus (HTNV) replication, in contrast to DDX21 and DDX60 which exerted anti-hantaviral effects by reinforcing IFN responses; this was demonstrated using an in-cell Western assay to measure viral protein expression upon DDX50 modulation.\",\n      \"method\": \"In-cell Western (ICW) assay measuring viral protein expression in HTNV-infected cells with DDX50 knockdown/modulation\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single assay method, no detailed mechanistic follow-up for DDX50 specifically, single lab\",\n      \"pmids\": [\"28676847\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DDX50 is a DExD/H-box RNA helicase that functions in innate antiviral immunity (promoting IRF3 activation and IFN-β production via TRIF-dependent signaling), resolves transcription-associated R-loops to prevent replication stress and DNA damage, and in the context of differentiation undergoes glucose-induced monomerization to bind STAU1 and redirect it from mRNA decay toward stabilization of pro-differentiation transcripts; additionally, DDX50 contains a Pro/N-degron recognized by the GID4 substrate receptor of the CTLH E3 ubiquitin ligase complex.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2022,\n      \"finding\": \"DDX50 is a viral restriction factor that promotes IRF3 signalling pathway activation following stimulation with viral RNA or infection with RNA and DNA viruses. Deletion of DDX50 in mouse and human cells impaired IRF3 phosphorylation and IRF3-dependent endogenous gene expression and cytokine/chemokine production in response to cytoplasmic dsRNA (polyIC transfection) and infection by RNA and DNA viruses. Mechanistically, DDX50 co-immunoprecipitated TRIF but acted independently of the previously described TRIF-dependent RNA sensor DDX1. Loss of DDX50 resulted in increased replication of vaccinia virus, herpes simplex virus, and Zika virus.\",\n      \"method\": \"CRISPR/shRNA deletion in mouse and human cells, co-immunoprecipitation, IRF3 phosphorylation assays, cytokine/chemokine measurement, viral replication assays\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KO, Co-IP, functional readouts) in both mouse and human cells with rigorous controls\",\n      \"pmids\": [\"35215908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DDX50 inhibits dengue virus 2 (DENV-2) replication during early infection by upregulating IFN-β production. DDX50 knockdown increased DENV-2 RNA levels while overexpression decreased them. DDX50 cooperated additively with RIG-I and MDA5 to upregulate the IFN-β promoter in infected cells, and DDX50 overexpression increased transcription of IFN-stimulated genes.\",\n      \"method\": \"siRNA knockdown, overexpression, IFN-β promoter reporter assay, qRT-PCR for viral RNA and ISGs\",\n      \"journal\": \"Archives of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods (KD, OE, reporter assay) in single lab\",\n      \"pmids\": [\"28181036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DDX50 promotes Hantaan virus (HTNV) replication, in contrast to DDX21 and DDX60 which reinforce IFN responses and exert anti-hantaviral effects, suggesting DDX50 has a pro-viral role in the context of HTNV infection.\",\n      \"method\": \"In-cell Western assay to measure viral protein expression following shRNA-mediated knockdown of DExD/H-box helicase family members\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single method (ICW assay), limited mechanistic follow-up, single lab\",\n      \"pmids\": [\"28676847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DDX37 and DDX50 maintain genome stability by resolving transcription-dependent R-loops (RNA-DNA hybrids). Depletion of DDX50 promotes DNA damage (H2AX phosphorylation, increased comet tail length), decreases DNA replication track length, and induces RPA focus formation indicative of replication stress. DDX50 depletion increases RNA-DNA hybrids, which can be rescued by RNase H1 overexpression. Inhibition of transcription prevented the increased RNA-DNA hybrid formation and DNA damage upon DDX50 depletion.\",\n      \"method\": \"siRNA knockdown, H2AX phosphorylation assay, comet assay, DNA fiber assay, RPA focus formation, S9.6 antibody-based RNA-DNA hybrid detection, RNase H1 rescue, transcription inhibition\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with mechanistic rescue experiments (RNase H1, transcription inhibition) demonstrating pathway placement\",\n      \"pmids\": [\"40043837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Glucose binding to conserved ATP-binding sequences of DDX50 alters protein conformation and dissociates DDX50 dimers into monomers. DDX50 monomers bind STAU1 and redirect it from an RNA-decay-promoting complex with UPF1 to a DDX50-STAU1 ribonuclear complex. This DDX50-STAU1 complex binds and stabilizes a set of pro-differentiation RNAs (including JUN, OVOL1, CEBPB, PRDM1, and TINCR) and modifies their structures. DDX50 was found essential for the differentiation of diverse cell types.\",\n      \"method\": \"Glucose-binding assays, conformation analysis, co-immunoprecipitation, RNA immunoprecipitation, RNA structure probing, loss-of-function differentiation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including biochemical reconstitution of glucose-binding effect on oligomerization, Co-IP, RNA binding and structure assays, and functional differentiation readouts\",\n      \"pmids\": [\"39764852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DDX50 contains a Pro/N-degron and is identified as an interactor of GID4, the substrate receptor of the CTLH E3 ubiquitin ligase complex. DDX50 was enriched in proximity-dependent biotinylation and quantitative proteomics experiments using the GID4 chemical probe PFI-7, suggesting DDX50 is subject to GID4-mediated regulation (degradative or non-degradative).\",\n      \"method\": \"Proximity-dependent biotinylation (BioID), quantitative proteomics, chemical probe (PFI-7) antagonizing Pro/N-degron binding to GID4\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — identified by proteomics with chemical probe validation, but direct functional consequence for DDX50 not fully resolved\",\n      \"pmids\": [\"38773330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"DDX50 was identified as a component of the human nucleolar proteome. Its abundance in the nucleolus changes in response to metabolic inhibitors that affect nucleolar morphology, indicating it is a dynamically associated nucleolar protein.\",\n      \"method\": \"Mass spectrometry-based organellar proteomics, stable isotope labelling (SILAC), quantitative analysis of nucleolar protein flux\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative proteomics with metabolic inhibitor perturbation; localization established by fractionation and MS\",\n      \"pmids\": [\"15635413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"DDX50 was identified as a nucleolar protein in a proteomic analysis of human nucleoli, supporting its localization to this subnuclear compartment.\",\n      \"method\": \"Mass spectrometry-based proteomic analysis of isolated nucleoli from HeLa cells\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical fractionation and MS identification; replicated across multiple nucleolar proteome studies\",\n      \"pmids\": [\"11790298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DDX50 was identified as an mRNA-binding protein in HeLa cells through UV crosslinking of RNA-binding proteins to mRNA followed by oligo(dT) purification and mass spectrometry (interactome capture), establishing it as a member of the mRNA-bound proteome.\",\n      \"method\": \"UV crosslinking, oligo(dT) purification, quantitative mass spectrometry (interactome capture)\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct covalent crosslinking biochemical method; large-scale systematic study\",\n      \"pmids\": [\"22658674\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DDX50 is a nucleolar DExD/H-box RNA helicase and mRNA-binding protein that functions as a broad-spectrum antiviral restriction factor by promoting IRF3 phosphorylation and IFN-β production via TRIF-dependent signalling (independently of DDX1), resolves transcription-dependent R-loops to prevent DNA damage and replication stress, and undergoes glucose-induced monomerization to form a DDX50-STAU1 complex that stabilizes pro-differentiation mRNAs by antagonizing Staufen-mediated mRNA decay; additionally, DDX50 contains a Pro/N-degron recognized by the CTLH E3 ligase substrate receptor GID4.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DDX50 is a DExD/H-box RNA helicase that operates at the intersection of innate antiviral immunity, genome maintenance, and cell differentiation. In innate immunity, DDX50 co-immunoprecipitates TRIF and promotes IRF3 phosphorylation and IFN-β production upon viral RNA sensing, restricting replication of RNA and DNA viruses independently of the DDX1–TRIF axis [PMID:35215908, PMID:28181036]. DDX50 resolves transcription-associated R-loops, and its depletion causes DNA damage, replication stress, and RNA–DNA hybrid accumulation that is reversed by RNase H1 overexpression or transcription inhibition [PMID:40043837]. During differentiation, glucose binding to DDX50 dissociates its dimers into monomers that recruit STAU1 away from UPF1-mediated mRNA decay, stabilizing pro-differentiation transcripts such as JUN, OVOL1, CEBPB, and PRDM1 [PMID:39764852].\",\n  \"teleology\": [\n    {\n      \"year\": 2017,\n      \"claim\": \"Establishing DDX50 as an antiviral factor: DDX50 was shown to cooperate with RIG-I and MDA5 to upregulate IFN-β production and restrict dengue virus replication, placing DDX50 within the innate RNA-sensing pathway.\",\n      \"evidence\": \"shRNA knockdown and overexpression in cell culture with DENV-2 RNA quantification and IFN-β promoter reporter assay\",\n      \"pmids\": [\"28181036\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between DDX50 and RIG-I/MDA5 was not demonstrated\",\n        \"Mechanism by which DDX50 contributes to IFN-β promoter activation was not resolved\",\n        \"Single virus system (DENV-2)\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolving the signaling axis: DDX50 was shown to act through TRIF-dependent IRF3 phosphorylation rather than the DDX1–TRIF pathway, establishing it as an independent viral restriction factor effective against multiple RNA and DNA viruses.\",\n      \"evidence\": \"CRISPR/shRNA knockout in mouse and human cells, co-immunoprecipitation of TRIF, IRF3 phosphorylation assays, and viral replication assays for vaccinia, HSV, and Zika virus\",\n      \"pmids\": [\"35215908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of DDX50–TRIF interaction is unknown\",\n        \"Whether DDX50 helicase activity is required for signaling was not tested\",\n        \"Mechanism distinguishing DDX50 from DDX1 in TRIF engagement is unclear\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealing a genome maintenance function: DDX50 depletion caused transcription-dependent R-loop accumulation, DNA damage, and replication stress, establishing DDX50 as an R-loop resolver that prevents replication–transcription conflicts.\",\n      \"evidence\": \"shRNA knockdown with γH2AX, comet assay, DNA fiber assay, RPA foci, S9.6 RNA–DNA hybrid immunofluorescence, RNase H1 rescue, and transcription inhibition rescue\",\n      \"pmids\": [\"40043837\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether DDX50 directly unwinds R-loops or acts indirectly through ribonucleoprotein remodeling is unresolved\",\n        \"Relationship between the R-loop resolution function and the innate immune function has not been explored\",\n        \"No structural or biochemical reconstitution of R-loop unwinding by DDX50\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identifying DDX50 as a CTLH/GID4 substrate: DDX50 was found to contain a Pro/N-degron recognized by GID4, linking it to the CTLH E3 ubiquitin ligase complex and suggesting regulated proteolytic turnover.\",\n      \"evidence\": \"Chemical probe (PFI-7) antagonism of GID4 Pro/N-degron binding combined with BioID proximity biotinylation and quantitative proteomics\",\n      \"pmids\": [\"38773330\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether GID4 interaction leads to DDX50 ubiquitination and degradation was not demonstrated\",\n        \"Functional consequence of CTLH-mediated regulation on DDX50 activity is unknown\",\n        \"Interaction identified by proximity proteomics; direct binding not validated by orthogonal method\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Uncovering a metabolic-sensing differentiation switch: glucose binding to DDX50 ATP-binding sites induces monomerization, enabling DDX50 to sequester STAU1 from UPF1-mediated decay and redirect it to stabilize pro-differentiation mRNAs, establishing DDX50 as a glucose-responsive post-transcriptional regulator of cell fate.\",\n      \"evidence\": \"Glucose-binding assays, conformational analysis, co-immunoprecipitation of STAU1 and UPF1, RNA immunoprecipitation, RNA stability assays, RNA structure probing, and loss-of-function differentiation assays in multiple cell types\",\n      \"pmids\": [\"39764852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether glucose concentrations fluctuating in physiological range are sufficient to trigger the switch in vivo is unclear\",\n        \"Relationship between the differentiation function and the innate immune/R-loop functions has not been addressed\",\n        \"Structural basis of glucose-induced monomerization is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how DDX50's multiple functions — antiviral signaling, R-loop resolution, and differentiation-linked mRNA stabilization — are coordinated in different cell states, and whether its helicase catalytic activity is required for each function.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No helicase-dead mutant studies to separate catalytic from scaffolding roles\",\n        \"No in vivo animal model phenotyping beyond viral challenge\",\n        \"Structural basis for DDX50 substrate RNA recognition is unresolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\n      \"DDX50-STAU1 ribonuclear complex\"\n    ],\n    \"partners\": [\n      \"TRIF\",\n      \"STAU1\",\n      \"UPF1\",\n      \"GID4\",\n      \"DDX21\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"DDX50 is a nucleolar DExD/H-box RNA helicase that functions at the intersection of innate immunity, genome maintenance, and mRNA metabolism. It promotes type I interferon responses by facilitating IRF3 phosphorylation and IFN-β production through a TRIF-dependent, DDX1-independent pathway, thereby restricting replication of diverse RNA and DNA viruses [PMID:35215908, PMID:28181036]. DDX50 resolves transcription-dependent R-loops to prevent DNA damage and replication stress, as demonstrated by rescue of DDX50-depletion phenotypes with RNase H1 overexpression or transcription inhibition [PMID:40043837]. Glucose-induced dissociation of DDX50 dimers into monomers enables formation of a DDX50–STAU1 ribonucleoprotein complex that antagonizes Staufen-mediated mRNA decay and stabilizes pro-differentiation transcripts, making DDX50 essential for cellular differentiation programs [PMID:39764852].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing where DDX50 resides was a prerequisite for understanding its function; proteomic mapping placed it in the nucleolus, implicating it in RNA-related nuclear processes.\",\n      \"evidence\": \"Mass spectrometry of isolated HeLa nucleoli\",\n      \"pmids\": [\"11790298\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional role assigned at this stage\", \"Nucleolar localization confirmed by fractionation-MS but not by imaging\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Quantitative nucleolar proteomics revealed DDX50 is dynamically associated with the nucleolus, with its abundance changing upon metabolic perturbation, suggesting regulated shuttling rather than static residence.\",\n      \"evidence\": \"SILAC-based quantitative proteomics of nucleolar fractions under actinomycin D treatment\",\n      \"pmids\": [\"15635413\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signals driving nucleolar retention or release unknown\", \"Functional consequence of redistribution not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"UV-crosslinking interactome capture identified DDX50 as a direct mRNA-binding protein, extending its substrate repertoire beyond ribosomal RNA processing expectations for a nucleolar helicase.\",\n      \"evidence\": \"UV crosslinking and oligo(dT) capture followed by mass spectrometry in HeLa cells\",\n      \"pmids\": [\"22658674\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific mRNA targets not identified\", \"Whether mRNA binding is functionally consequential was unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The first functional role for DDX50 emerged in antiviral immunity: DDX50 restricted dengue virus replication by promoting IFN-β production, cooperating additively with RIG-I and MDA5, placing it in the innate immune sensing pathway.\",\n      \"evidence\": \"siRNA knockdown and overexpression with IFN-β reporter assays and ISG qRT-PCR during DENV-2 infection\",\n      \"pmids\": [\"28181036\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signalling adaptor through which DDX50 operated was not identified\", \"A separate study reported a pro-viral role for DDX50 during hantavirus infection, raising context-dependency questions (PMID:28676847)\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The mechanistic basis of DDX50's antiviral function was resolved: DDX50 interacts with TRIF to promote IRF3 phosphorylation independently of DDX1, establishing it as a bona fide restriction factor against both RNA and DNA viruses.\",\n      \"evidence\": \"CRISPR knockout in mouse and human cells, co-immunoprecipitation with TRIF, IRF3 phosphorylation and cytokine assays, viral replication assays for vaccinia, HSV, and Zika viruses\",\n      \"pmids\": [\"35215908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct RNA-sensing activity versus adaptor role not biochemically resolved\", \"Crystal or cryo-EM structure of DDX50–TRIF complex unavailable\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of a Pro/N-degron in DDX50 recognized by the CTLH E3 ligase receptor GID4 revealed a potential ubiquitin-dependent regulatory mechanism controlling DDX50 turnover.\",\n      \"evidence\": \"BioID proximity biotinylation and quantitative proteomics with chemical probe PFI-7\",\n      \"pmids\": [\"38773330\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether GID4 binding leads to DDX50 degradation or non-degradative ubiquitination not resolved\", \"Physiological conditions triggering GID4-mediated regulation unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A genome maintenance role was uncovered: DDX50 resolves transcription-dependent R-loops, and its depletion causes DNA damage and replication stress that is rescued by RNase H1, establishing DDX50 as a guardian of genome integrity.\",\n      \"evidence\": \"siRNA depletion with γH2AX, comet assay, DNA fiber analysis, S9.6 antibody detection of R-loops, RNase H1 rescue, transcription inhibition rescue\",\n      \"pmids\": [\"40043837\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether R-loop resolution uses the same helicase activity as mRNA-related functions is unclear\", \"Relationship to DDX37, which shares R-loop resolution activity, not mechanistically dissected\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A metabolic sensing mechanism was revealed: glucose binds DDX50 at its ATP-binding cassettes, triggering dimer-to-monomer conversion that enables formation of a DDX50–STAU1 complex, which stabilizes pro-differentiation mRNAs by sequestering STAU1 from UPF1-dependent decay.\",\n      \"evidence\": \"Glucose-binding assays, oligomerization analysis, co-immunoprecipitation, RNA immunoprecipitation, RNA structure probing, differentiation assays in multiple cell types\",\n      \"pmids\": [\"39764852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether glucose-dependent monomerization also regulates DDX50's antiviral or R-loop resolution activities is unknown\", \"Structural basis of glucose binding to the ATP-binding cassette not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include whether DDX50's distinct functions — innate immune signalling, R-loop resolution, and mRNA stabilization — are coordinated or independently regulated, and what structural features allow glucose and ATP to differentially modulate its activity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of DDX50 in any functional state\", \"Crosstalk between antiviral, genome stability, and mRNA decay functions untested\", \"In vivo phenotyping in DDX50-null organisms not reported\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [4, 8]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 6, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [4, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TRIF\", \"STAU1\", \"UPF1\", \"GID4\"],\n    \"other_free_text\": []\n  }\n}\n```"}