{"gene":"DDX6","run_date":"2026-06-09T23:54:41","timeline":{"discoveries":[{"year":2006,"finding":"RCK/p54 (DDX6) directly interacts with Argonaute proteins Ago1 and Ago2 in affinity-purified active siRISC and miRISC from human cells. Depletion of RCK/p54 disrupts P-bodies, disperses Ago2 throughout the cytoplasm, releases miRNA-induced translational repression, but does not significantly affect siRNA-mediated RNA cleavage functions of RISC.","method":"Affinity purification of active RISC complexes, co-immunoprecipitation, siRNA knockdown with translational repression assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP in active RISC, functional knockdown rescue, replicated across multiple miRNA targets","pmids":["16756390"],"is_preprint":false},{"year":2014,"finding":"The CNOT1 MIF4G domain directly recruits DDX6 through interaction with the C-terminal RecA2 domain of DDX6. Crystal structure of the DDX6-CNOT1 MIF4G complex shows striking similarity to the eIF4G-eIF4A complex. CNOT1 modulates the conformation of DDX6 and stimulates its ATPase activity. Structure-based mutations disrupting the CNOT1 MIF4G-DDX6 interaction impair miRNA-mediated repression.","method":"Crystal structure determination, ATPase activity assays, structure-guided mutagenesis, miRNA repression assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus biochemical reconstitution plus mutagenesis, independently replicated in concurrent paper (PMID 24768540)","pmids":["24768538","24768540"],"is_preprint":false},{"year":2014,"finding":"The CNOT1 MIF4G domain interacts with the C-terminal RecA2 domain of DDX6; the crystal structure of this complex demonstrates that DDX6 binds CNOT1 in a manner analogous to eIF4A binding eIF4G. This interaction connects miRNA target recognition to translational repression and decapping.","method":"Crystal structure of DDX6 RecA2–CNOT1 MIF4G complex, biochemical binding assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional validation, independently replicated in concurrent paper (PMID 24768538)","pmids":["24768540"],"is_preprint":false},{"year":2009,"finding":"The crystal structure of the DDX6 C-terminal RecA-like domain bound to the FDF motif of decapping activator EDC3 was determined. The FDF peptide adopts an alpha-helical conformation occupying a shallow groove on DDX6 opposite to the RNA-binding and ATP hydrolysis surfaces. The translational repressor Tral contains a similar FDF motif that binds the same surface, making EDC3 and Tral interactions with DDX6/Me31B mutually exclusive. Mutagenesis of Me31B's FDF interaction surface abrogates P-body accumulation and mRNA repression.","method":"Crystal structure, mutagenesis of Me31B, competition binding assays, P-body accumulation assays, mRNA repression assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus functional assays in single rigorous study","pmids":["19285948"],"is_preprint":false},{"year":2015,"finding":"The 2.1-Å crystal structure of a ternary 4E-T CHD/DDX6/CNOT1 MIF4G complex reveals how the 4E-T CUP-homology domain wraps around the RecA2 domain of DDX6 and contacts CNOT1. Unlike Edc3 and Pat1 FDF motifs, which dissociate from DDX6 upon CNOT1 MIF4G binding in vitro, 4E-T CHD interacts with DDX6 in both the presence and absence of CNOT1.","method":"X-ray crystallography (2.1 Å), in vitro binding competition assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure with orthogonal biochemical competition assays","pmids":["26489469"],"is_preprint":false},{"year":2014,"finding":"Direct interaction between CNOT1 (large scaffolding subunit of CCR4-NOT) and DDX6 is required for miRISC-mediated gene silencing in human cells. DDX6 binds a conserved CNOT1 subdomain analogous to the eIF4A-eIF4G interaction; mutations disrupting this interaction impair miRNA silencing.","method":"Co-immunoprecipitation, in vitro binding with purified proteins, mutagenesis, miRNA silencing reporter assays in human cells","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, mutagenesis, and functional silencing assays, consistent with structural data from concurrent papers","pmids":["25035296"],"is_preprint":false},{"year":2016,"finding":"The DDX6–4E-T interaction mediates both miRNA-dependent translational repression and de novo P-body assembly. Joint deletion of two short conserved motifs in 4E-T that bind UNR and DDX6 relieves translational repression, partly through the 4E-T–DDX6–CNOT1 axis.","method":"Mass spectrometry to map interaction sites, deletion mutagenesis, translational repression reporter assays, P-body assembly microscopy","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (MS, mutagenesis, functional reporters, imaging) in single study","pmids":["27342281"],"is_preprint":false},{"year":2003,"finding":"Recombinant rck/p54 specifically binds c-myc RNA transcripts and exhibits ATP-dependent RNA-unwinding activity toward c-myc RNAs in vitro. The C-terminal 184 amino acid domain (aa 289–472) is required for RNA unwinding activity.","method":"Surface plasmon resonance RNA binding assay, in vitro helicase/unwinding assay, deletion mutagenesis","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro biochemical assay with deletion mutagenesis, single lab, no replication","pmids":["12875652"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of the N-terminal core domain (Nc-rck/p54, residues 70–288) reveals a P-loop in motif I adopting a closed conformation induced by Asn131, a residue unique to the RCK subfamily, such that ATP does not bind this loop in the unliganded state. ATP induces a conformational change bringing N- and C-terminal domains together for RNA unwinding. c-Myc IRES RNA is a substrate for rck/p54-mediated unwinding, and overexpression of rck/p54 in HeLa cells causes G2/M arrest with downregulation of c-myc.","method":"X-ray crystallography, dynamic light scattering, in vitro helicase assay, electron microscopy, luciferase IRES assay, cell cycle analysis","journal":"Genes to cells","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus multiple biochemical assays plus cellular functional readouts in single study","pmids":["16611246"],"is_preprint":false},{"year":2002,"finding":"Xp54 (DDX6 ortholog) shuttles between nucleus and cytoplasm via a leucine-rich nuclear export signal (NES) recognized by the CRM1 pathway (blocked by leptomycin B). Xp54 binds nascent transcripts on lampbrush chromosome loops in the nucleus and accompanies mRNA to the cytoplasm by an alternative export pathway, remaining associated with masked mRNA until translational activation.","method":"Microinjection of recombinant protein in oocytes, leptomycin B treatment, NES mutagenesis, immunostaining of lampbrush chromosomes, co-immunoprecipitation with de novo RNA","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with pharmacological and genetic perturbation, Xenopus ortholog","pmids":["11839790"],"is_preprint":false},{"year":2017,"finding":"DDX6 localizes to both nucleus and cytoplasm in human cells. Nuclear import of DDX6 can be mediated in a piggyback manner by 4E-T, rather than by a canonical NLS/importin-α/β pathway. DDX6 also enters newly formed nuclei by associating ('hitch-hiking') with mitotic chromosomes via its C-terminal domain during M phase.","method":"Live-cell imaging, fractionation, co-immunoprecipitation, mitotic chromosome association assays, domain deletion analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional domain analysis, single lab with multiple orthogonal approaches","pmids":["28216671"],"is_preprint":false},{"year":2010,"finding":"DDX6 interacts with hnRNP K and hnRNP E1 in a DICE (differentiation control element)-dependent manner in erythroid K562 cells. DDX6 colocalizes with endogenous hr15-LOX mRNA in P-body-like RNP granules from which 60S ribosomal subunits are excluded. DDX6 knockdown disrupts storage of hr15-LOX mRNA in these granules, indicating DDX6 maintains translational silencing by recruiting silenced mRNA to P-body-like storage compartments.","method":"RNA chromatography with DICE as bait, hnRNP K immunoprecipitation, RNAi knockdown, FISH co-localization, ribosomal fractionation","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RNA affinity, Co-IP, RNAi, FISH) in single lab study","pmids":["20884783"],"is_preprint":false},{"year":2011,"finding":"DDX6 binds the DB1 and DB2 stem-loop structures in the dengue virus 3' UTR in vitro, and this interaction occurs in vivo during DENV infection. DDX6 knockdown reduces infectious particle production and viral RNA levels. DDX6 colocalizes with the DENV replication complex.","method":"RNA chromatography with quantitative mass spectrometry, in vitro RNA-protein binding assays, siRNA knockdown, immunofluorescence co-localization","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro RNA binding mapped to specific structures plus in vivo interaction confirmation, single lab","pmids":["21957497"],"is_preprint":false},{"year":2012,"finding":"DDX6 helicase activity (DEAD-box motif II) is required for efficient HCV replication. A helicase-deficient DQAD mutant has a dominant-negative effect reducing HCV yields, whereas overexpression of DDX6 enhances replication. An intracellular complex containing DDX6, HCV core protein, and both viral and cellular RNAs is formed in a C-terminal domain-dependent but helicase-activity-independent manner.","method":"siRNA knockdown and rescue with siRNA-resistant mutant, overexpression of helicase-dead (DQAD) mutant, co-immunoprecipitation","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis with rescue, Co-IP for complex identification, single lab","pmids":["20392846"],"is_preprint":false},{"year":2012,"finding":"DDX6 acts enzymatically (ATPase/helicase activity required) to facilitate HIV-1 capsid assembly, specifically at the step of Gag multimerization at the plasma membrane. Assembling HIV-1 co-opts a preexisting host complex containing ABCE1 and PB proteins including DDX6. DDX6 knockdown reduces production of infectious HIV-1 from primary human T cells.","method":"Co-immunoprecipitation, immunoelectron microscopy, siRNA knockdown with rescue, localization of assembly defect by IEM","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IEM localization plus functional knockdown/rescue, multiple orthogonal methods, single lab","pmids":["22851315"],"is_preprint":false},{"year":2011,"finding":"DDX6 ATPase/helicase motif is essential for foamy virus genome packaging. During infection, DDX6 relocalizes from P-bodies/stress granules to the pericentriolar viral assembly site. DDX6 does not stably interact with Gag proteins and is not incorporated into virions, suggesting it transiently remodels viral RNA–Gag RNP to facilitate genome encapsidation.","method":"siRNA knockdown, ATPase mutant rescue, immunofluorescence relocalization, viral RNA quantification in particles","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional mutagenesis plus localization imaging, single lab","pmids":["22022269"],"is_preprint":false},{"year":2014,"finding":"DDX6 interacts with CUG triplet-repeat RNA in primary fibroblasts from DM1 patients and unwinds CUG-repeat duplexes in vitro in an ATP-dependent manner. DDX6 overexpression causes relocation of CUG-expanded DMPK-mRNA foci from nucleus to cytoplasm and dispersal of MBNL1, relieving DM1 mis-splicing. Knockdown of DDX6 increases nuclear DMPK-mRNA foci and MBNL1 sequestration.","method":"RIP (RNA immunoprecipitation) in patient fibroblasts, in vitro CUG-RNA unwinding assay, DDX6 overexpression and knockdown with splicing assays, immunofluorescence","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro unwinding assay plus cellular gain/loss-of-function with splicing readout, single lab","pmids":["24792155"],"is_preprint":false},{"year":2015,"finding":"DDX6 associates with YBX1 to bind stem loops in the 3' UTRs of CDK1 and EZH2 mRNAs and recruits them to eIF4E to facilitate translation, maintaining progenitor self-renewal. DDX6 also associates with mRNA degradation proteins to degrade KLF4 mRNA (differentiation inducer) via its 5' UTR. Loss of DDX6 in epidermal progenitor cells causes premature differentiation and decreased proliferation.","method":"Co-immunoprecipitation with YBX1, mRNA pull-down, polysome profiling, RNAi knockdown in epidermal progenitors with differentiation/proliferation phenotypic readouts","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, mRNA binding assays, cellular loss-of-function with specific phenotype, single lab","pmids":["26412305"],"is_preprint":false},{"year":2019,"finding":"DDX6 mediates translational suppression of target mRNAs in P-bodies; loss of DDX6 dissolves P-bodies, releasing mRNAs encoding fate-instructive transcription and chromatin factors into the ribosome pool. Increased translation of these targets rewires enhancer, heterochromatin, and DNA methylation landscapes, endowing primed ESCs with a hyper-pluripotent, differentiation-resistant state.","method":"DDX6 knockdown/knockout in human and mouse ESCs, polysome profiling, ATAC-seq, ChIP-seq, DNA methylation profiling, P-body imaging","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal omics and functional methods, replicated in human and mouse systems","pmids":["31588046"],"is_preprint":false},{"year":2019,"finding":"De novo missense variants in the RecA-2 domain of DDX6 (p.His372Arg, p.Arg373Gln, p.Cys390Arg, p.Thr391Ile, p.Thr391Pro) cause P-body assembly defects and disrupt interactions with protein partners in immunoprecipitation assays, establishing that RecA-2 domain integrity is required for P-body assembly and partner binding in human cells.","method":"Patient-derived fibroblast and cell line P-body assembly assays, immunoprecipitation of DDX6 variants, complementation assays, structural modeling","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional cellular assays with multiple patient variants and complementation, single consortium study","pmids":["31422817"],"is_preprint":false},{"year":2013,"finding":"Recombinant DDX6 inhibits VEGF IRES-mediated translation in normoxic MCF-7 cell extracts. DDX6 interacts with the VEGF mRNA 5' UTR by RNA affinity chromatography. Under hypoxia, DDX6 protein levels decline and its interaction with VEGF mRNA is diminished; DDX6 depletion by RNAi further promotes VEGF expression and vascular tube formation.","method":"In vitro IRES-translation assay with recombinant DDX6, RNA affinity chromatography/mass spectrometry, RNAi knockdown, VEGF secretion and HUVEC tube formation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro translation inhibition plus cellular RNAi with functional readout, single lab","pmids":["23293030"],"is_preprint":false},{"year":2017,"finding":"DDX6 deficiency causes global upregulation of interferon-stimulated genes (ISGs) in a cell-intrinsic manner, imposing an antiviral state. Epistatic analysis showed ISG activation cannot be overcome by deletion of canonical RNA sensors, but DDX6 deficiency is suppressed by disrupting LSM1 (mRNA degradation machinery component), placing DDX6 in a pathway that limits aberrant ISG activation through RNA degradation.","method":"Genome-wide genetic screen, DDX6 knockout with transcriptomics, epistasis analysis (double knockout with LSM1 and RNA sensors), viral infection assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide screen plus genetic epistasis with multiple double-KO combinations, functional antiviral phenotype","pmids":["28746868"],"is_preprint":false},{"year":2018,"finding":"DDX6 associates with RIG-I; their interaction increases after influenza B virus infection. DDX6 augments RIG-I-mediated induction of IFN-β expression. DDX6 binds viral RNA capable of stimulating RIG-I, suggesting it functions as an RNA co-sensor and signaling enhancer for RIG-I.","method":"Affinity purification/quantitative mass spectrometry, co-immunoprecipitation, IFN-β reporter assay, viral RNA binding assay","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus functional IFN reporter assay, single lab","pmids":["29949917"],"is_preprint":false},{"year":2024,"finding":"DDX6 limits stress granule formation in an ATPase and RNA-binding dependent manner, independent of P-body formation. Loss of DDX6 (along with 4E-T and DCP1A) increases P-body docking with stress granules in a manner dependent on CNOT1 and PAT1B.","method":"DDX6 knockout, ATPase mutant rescue, stress granule and P-body live imaging, co-localization analysis, epistasis with CNOT1/PAT1B knockdowns","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout plus structure-function mutants plus epistasis, single lab","pmids":["38536035"],"is_preprint":false},{"year":2024,"finding":"DDX6 triggers deadenylation-dependent decay of inefficiently translated mRNAs. DDX6 interacts with the ribosome through its RecA2-domain FDF motif. Both RecA2-mediated interactions and ATPase activity are required for DDX6 to destabilize inefficiently translated mRNAs. Ribosome profiling identifies two classes of DDX6-regulated endogenous mRNAs: those with poor overall translation efficiency and those with locally reduced ribosome translocation rates.","method":"Ribosome profiling, RNA sequencing, FDF-motif mutagenesis, reporter mRNA assays, ATPase mutant analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal approaches (ribosome profiling, reporter assays, mutagenesis) demonstrating mechanism, single rigorous study","pmids":["38989862"],"is_preprint":false},{"year":2023,"finding":"DDX6 helicase activity (E247A mutant is inactive) is required for maintaining proper separation of P-bodies from stress granules under stress. DDX6 deficiency results in formation of irregular 'hybrid' PB/SG granules. The interactions of DDX6 with CNOT1 and 4E-T modulate both P-body and stress granule biogenesis.","method":"DDX6 knockout cell lines, helicase-dead E247A mutant rescue, fluorescence microscopy of PB and SG markers, CNOT1/4E-T knockdown epistasis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — structure-function mutagenesis plus epistasis with partner proteins, single lab","pmids":["37427791"],"is_preprint":false},{"year":2015,"finding":"DDX6 interactome by TAP-MS identifies three main complexes: the decapping complex, a CPEB-like complex, and an Ataxin2/Ataxin2L complex; the exon junction complex (EJC) was also found, suggesting DDX6 binding to newly exported mRNAs. Some DDX6 associates with polysomes. P-body assembly requires DDX6 together with 4E-T and LSM14A in all tested conditions, whereas decay complex proteins are dispensable for P-body assembly per se.","method":"Tandem affinity purification (TAP) with mass spectrometry, P-body assembly assays under multiple conditions, knockdown of individual components","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic interactome mapping with functional P-body assembly assays, single lab","pmids":["25995375"],"is_preprint":false},{"year":2012,"finding":"Rck/p54 (DDX6) binds RNA with no sequence specificity and high nanomolar affinity. RNA binding is ATP-independent, but relaxing (unwinding) of bound RNA requires ATP (not ATP hydrolysis). Rck/p54 is in large molecular excess relative to cellular mRNAs and is enriched to ~0.5 mM in P-bodies, organized in clusters, with multiple Rck/p54 proteins binding along individual mRNA molecules in vivo.","method":"In vitro RNA binding assays with purified protein, RNA conformation assays, quantitative immunofluorescence of P-bodies, in vivo crosslinking","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical characterization plus in vivo quantitative imaging, single lab","pmids":["22836354"],"is_preprint":false},{"year":2016,"finding":"DDX6 binds 7SK snRNA and causes release and transfer of P-TEFb from 7SK snRNP to the AF4/AFF1 super elongation complex (SEC). DDX6 binds stably to AF4 and AF4N as demonstrated by GST pull-down and co-immunoprecipitation. Overexpression of DDX6 increases cellular mRNA production ~5–6 fold; knockdown of DDX6 decreases mRNA production by ~70%.","method":"7SK snRNA binding assay, GST pull-down, co-immunoprecipitation, mRNA production assay with overexpression and knockdown","journal":"American journal of blood research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single Co-IP and pull-down methods without deep mechanistic resolution","pmids":["27679741"],"is_preprint":false},{"year":2017,"finding":"In Drosophila circadian pacemaker neurons, ME31B/DDX6 is required for ATX2 association with NOT1, enabling NOT1-mediated gene silencing. The ME31B/DDX6–NOT1 complex supports high-amplitude behavioral rhythms independently of PERIOD (PER) translation. LSM12 separately acts as a molecular adaptor recruiting TYF to ATX2 for TYF-dependent PER translation.","method":"Genetic interaction assays in Drosophila, co-immunoprecipitation of ATX2/NOT1/ME31B, behavioral rhythm analysis, molecular epistasis","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus genetic epistasis with behavioral phenotype, Drosophila ortholog","pmids":["28388438"],"is_preprint":false},{"year":2007,"finding":"Ataxin-2 directly interacts with DDX6, a component of P-bodies and stress granules. Altered ataxin-2 levels interfere with assembly of stress granules and P-bodies. Ataxin-2 also regulates the intracellular concentration of poly(A)-binding protein (PABP), another interaction partner.","method":"Co-immunoprecipitation, overexpression/knockdown of ataxin-2, immunofluorescence of P-bodies and stress granules","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus functional imaging assays, replicated across conditions","pmids":["17392519"],"is_preprint":false},{"year":2024,"finding":"PolyQ-expanded (PQE) ataxin-2 sequesters DDX6 into aggregates via RNA sequences. The N-terminal LSm domain of ataxin-2 (residues 82–184) and the C-terminal helicase domain of DDX6 mediate this interaction. Sequestration of DDX6 impairs P-body assembly, releasing MARF1 endoribonuclease and promoting mRNA decay and translational repression, which can be rescued by restoring DDX6 protein levels.","method":"Biochemical fractionation, fluorescence imaging, domain mapping by Co-IP with truncation mutants, rescue experiments by DDX6 restoration","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping plus functional rescue assays, single lab","pmids":["38810698"],"is_preprint":false},{"year":2022,"finding":"In early mouse embryogenesis, DDX6 prevents aberrant upregulation of BMP signaling inhibitors through miRNA-mediated gene silencing. Ddx6 knockout phenocopies Dgcr8 (miRNA pathway) knockout but not Dcp2 (decapping) or Eif4enif1 (4E-T, P-body) knockout, establishing that DDX6's early developmental function is primarily via the miRNA pathway rather than P-body-related functions.","method":"Ddx6 KO mice, Dgcr8 KO, Dcp2 KO, Eif4enif1 KO mouse models, in vitro EpiLC differentiation assay, transcriptome analysis, genetic epistasis","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple parallel KO models providing clear pathway placement, replicated across in vivo and in vitro systems","pmids":["36197846"],"is_preprint":false},{"year":2021,"finding":"DDX6 is a positive regulator of the Ataxin-2/PAPD4 cytoplasmic polyadenylation machinery. DDX6 interacts with Ataxin-2, PABPC1, and PAPD4 in immunoprecipitation assays. DDX6 downregulation increases Ataxin-2 target mRNAs with short poly(A) tails and reduces their protein levels, similar to Ataxin-2 downregulation. DDX6 likely promotes binding of Ataxin-2 to target mRNAs to maintain poly(A) tail length.","method":"LC-MS/MS interactome analysis, Co-IP, siRNA knockdown of DDX6/Ataxin-2, poly(A) tail length assay","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP plus knockdown phenotype, single lab, limited mechanistic resolution","pmids":["33756349"],"is_preprint":false},{"year":2025,"finding":"DDX6 interacts directly with DDX3X via its C-terminal region; this interaction is required for DDX6-mediated translational repression in miRNA-mediated silencing. DDX6 mutant defective in DDX3X interaction cannot rescue miRNA silencing defects in ESCs and fails to inhibit 48S preinitiation complex formation in vitro.","method":"Conditional knockout of DDX3X, biochemical Co-IP of DDX6/DDX3X, DDX6 interaction-defective mutant rescue assay, in vitro 48S preinitiation complex assembly assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution of 48S inhibition plus mutagenesis plus cellular rescue assays, single rigorous study","pmids":["40923767"],"is_preprint":false},{"year":2025,"finding":"E3 ubiquitin ligase praja2 forms a complex with DDX6 and promotes P-body assembly through non-proteolytic polyubiquitylation of DDX6 upon cAMP/GPCR signaling. Expression of ubiquitylation-defective DDX6 mutant suppresses P-body assembly and sustains GBM growth. Genetic inactivation of praja2 reshapes DDX6/mRNA complexes and translating polysomes, promoting cellular senescence and GBM growth arrest.","method":"Co-immunoprecipitation of praja2/DDX6 complex, ubiquitylation-defective mutant expression, polysome profiling, cAMP stimulation, GBM cell proliferation assays","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitylation mutant rescue plus functional cellular assays, single lab","pmids":["40148504"],"is_preprint":false},{"year":2001,"finding":"Overexpression of rck/p54 in COS7 and SW480 colorectal cancer cells causes an increase in c-myc protein levels by enhancing translation efficiency and/or stabilizing c-myc mRNA.","method":"Transfection overexpression, Western blot, translational efficiency assessment","journal":"Carcinogenesis","confidence":"Low","confidence_rationale":"Tier 3 / Weak — overexpression phenotype with limited mechanistic resolution, single lab","pmids":["11751426"],"is_preprint":false},{"year":2021,"finding":"DDX6 binds the dengue virus 3' UTR A3 element RNA hairpin with nanomolar affinity; three conserved basic residues (Lys307, Lys367, Arg369) and an unstructured C-terminal extension are required. Alanine substitution of these residues results in RNA-independent ATPase activity, indicating RNA binding and ATPase activities are coupled. DDX6-mediated interaction with DENV A3 element contributes to G1/S cell cycle arrest during infection; DDX6 overexpression rescues DNA preinitiation complex expression.","method":"Binding affinity measurements, mutagenesis of DDX6 basic residues, DDX6 CLIP in infected cells, ATPase activity assay, cell cycle analysis, rescue of DNA replication complex","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis-linked biochemical and cellular assays, single lab","pmids":["34132569"],"is_preprint":false},{"year":2024,"finding":"DDX6 undergoes liquid-liquid phase separation (LLPS) to form P-bodies that serve as 'reservoirs' for DDX6-bound mRNAs with low GC content. DDX6 KO leads to P-body dissolution and release of sequestered mRNAs (including BCAT1) into the cytosol for degradation, thereby reprogramming amino acid metabolism and sensitizing AML cells to cytarabine.","method":"In vitro and in vivo CRISPR screen, DDX6 KO, RIP-seq, RNA-seq, polysome profiling, metabolic assays, drug sensitivity assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide CRISPR screen, RIP-seq mapping of DDX6-bound mRNAs, metabolic readout, replicated in vitro and in vivo","pmids":["41330929"],"is_preprint":false},{"year":2024,"finding":"DDX6 is strongly associated with NF-κB pathway components p65/RelA and IκBα (but not TRADD, RIP, or TRAF2) by co-immunoprecipitation. Forced expression of DDX6 enhances NF-κB promoter activity independent of its RNA helicase activity. DDX6 silencing reduces TNF-α-induced phosphorylation of p65 and IκBα, nuclear localization of p65, and IκBα protein levels.","method":"Co-immunoprecipitation, NF-κB reporter assay with helicase-inactive mutant, siRNA knockdown, immunofluorescence of p65 nuclear localization, imiquimod dermatitis mouse model","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with helicase-dead mutant plus functional reporter assays, single lab","pmids":["38377944"],"is_preprint":false},{"year":2024,"finding":"ADAR1 interacts with DDX6 in the nucleus. DDX6 functions as a negative regulator of cellular ADAR1p110 and ADAR2 editing activity, as assessed by a dual-fluorescence reporter assay. Depletion of DDX6 facilitates RA-induced neuronal differentiation.","method":"Nuclear fraction mass spectrometry/immunoprecipitation, dual-fluorescence RNA editing reporter assay, DDX6 knockdown in neuronal differentiation model","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP plus reporter assay, single lab, limited mechanistic detail in abstract","pmids":["36834609"],"is_preprint":false},{"year":2024,"finding":"NMDAR stimulation causes S387 phosphorylation of Ago2, which recruits DDX6 to RISC. DDX6 recruitment to RISC is required for NMDAR-dependent silencing of Limk1 mRNA via miR-134 (but not Apt1 via miR-138), and is essential for NMDAR-dependent dendritic spine shrinkage.","method":"Ago2 S387 phosphorylation assays, DDX6 knockdown in neurons, mRNA-specific RISC RIP, dendritic spine morphology assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional RNAi with specific mRNA and spine morphology readouts, single lab","pmids":["38321143"],"is_preprint":false},{"year":2023,"finding":"In Drosophila germline, mutations in the helicase domain, N-terminal domain, C-terminal domain, and FDF-binding motif of Me31B/DDX6 by CRISPR cause distinct defects in fertility, oogenesis, embryo patterning, and germline mRNA regulation, demonstrating that different motifs contribute distinct functions in vivo.","method":"CRISPR mutagenesis of specific motifs, Drosophila germline phenotype analysis, mRNA regulation assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo CRISPR structure-function analysis with multiple distinct mutants, Drosophila ortholog","pmids":["37235728"],"is_preprint":false},{"year":2019,"finding":"DDX6 is required for NANOS2 localization and function in mouse male germ cells. DDX6-null germ cells show both P-body-dependent and P-body-independent defects compared to NANOS2-null germ cells, demonstrating that NANOS2 function is carried out via both DDX6/P-body-dependent and -independent mechanisms.","method":"Germ cell-specific Cre-mediated Ddx6 deletion in chimeric embryos, comparative phenotype analysis vs. NANOS2-null, RNA-seq","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional genetic KO with comparative epistatic analysis and RNA-seq, single lab","pmids":["30679547"],"is_preprint":false},{"year":2023,"finding":"DDX6 antagonizes PI3K-AKT signaling in mouse oocytes to maintain primordial follicles. Oocyte-specific Ddx6 knockout causes P-body-like granule disassembly, abnormal oocyte enlargement via enhanced PI3K-AKT signaling, and premature depletion of primordial follicles. Conversely, forced activation of PI3K-AKT (by Pten KO) disassembles P-body-like granules, supporting mutual antagonism between DDX6/P-bodies and PI3K-AKT signaling.","method":"Oocyte-specific Cre (Gdf9-iCre) conditional Ddx6 KO mice, Pten KO epistasis, immunofluorescence of P-body markers, follicle counting","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO plus genetic epistasis with Pten KO, single lab","pmids":["37067907"],"is_preprint":false}],"current_model":"DDX6 (RCK/p54) is a conserved DEAD-box RNA helicase that functions as a central hub in post-transcriptional gene regulation: it is recruited to miRNA-targeted mRNAs via direct interaction of its RecA2 domain with the CNOT1 MIF4G domain (structurally analogous to eIF4A–eIF4G), where it represses translation (requiring its ATPase activity and, newly identified, interaction with DDX3X to block 48S preinitiation complex assembly) and promotes deadenylation-dependent mRNA decay of inefficiently translated mRNAs through its ribosome-associated FDF motif; it also interacts with Argonaute proteins in RISC, EDC3 and Pat1 decapping activators (mutually exclusively via their FDF motifs on the same RecA2 groove), and the translational repressor 4E-T (via a ternary complex with CNOT1), together driving P-body assembly that sequesters repressed mRNPs; additionally, DDX6 limits aberrant stress granule formation, participates in innate immune signaling by enhancing RIG-I-mediated IFN-β induction and suppressing ISG overactivation via the mRNA degradation machinery, and undergoes non-proteolytic polyubiquitylation by praja2 downstream of cAMP signaling to regulate P-body assembly and translational output."},"narrative":{"mechanistic_narrative":"DDX6 (RCK/p54) is a conserved DEAD-box ATP-dependent RNA helicase that serves as a central scaffold for post-transcriptional gene regulation, coupling miRNA-mediated silencing, translational repression, mRNA decay, and cytoplasmic RNP granule assembly [PMID:24768538, PMID:24768540, PMID:31588046, PMID:38989862]. It is recruited to miRNA-targeted transcripts through a direct interaction between its C-terminal RecA2 domain and the CNOT1 MIF4G domain, an arrangement structurally analogous to the eIF4A–eIF4G interaction that simultaneously stimulates DDX6 ATPase activity and links target recognition by the CCR4-NOT deadenylase to repression [PMID:24768538, PMID:24768540, PMID:25035296]. DDX6 binds RNA without sequence specificity at high affinity, and ATP binding (not hydrolysis) drives relaxation of bound RNA; its concentration in cells far exceeds that of mRNA, consistent with coating transcripts within granules [PMID:22836354]. The same shallow RecA2 groove engages the FDF motifs of the decapping activator EDC3 and translational repressor Tral/Pat1 in a mutually exclusive manner, while the 4E-T CUP-homology domain binds DDX6 alongside CNOT1 in a ternary complex, and DDX6's own RecA2 FDF motif tethers it to the ribosome to trigger deadenylation-dependent decay of inefficiently translated mRNAs [PMID:19285948, PMID:26489469, PMID:38989862]. Translational repression additionally requires direct interaction with DDX3X to block 48S preinitiation complex assembly [PMID:40923767]. Through these interactions DDX6 drives liquid-liquid phase separation into P-bodies that sequester repressed mRNPs, with 4E-T and LSM14A as obligate co-factors, and it concurrently limits aberrant stress granule formation in an ATPase- and RNA-binding–dependent manner [PMID:25995375, PMID:41330929, PMID:38536035]. This activity governs cell-fate decisions: loss of DDX6 dissolves P-bodies and de-represses fate-instructive factors to lock embryonic stem cells in a hyper-pluripotent state, while in early embryogenesis its essential function operates through the miRNA pathway rather than P-body or decapping arms [PMID:31588046, PMID:36197846]. DDX6 also restrains innate antiviral responses, limiting interferon-stimulated gene overactivation via the LSM1-dependent mRNA degradation machinery [PMID:28746868]. De novo missense variants in the DDX6 RecA2 domain disrupt partner binding and P-body assembly, establishing this domain's integrity as required for human neurodevelopmental function [PMID:31422817].","teleology":[{"year":2003,"claim":"Establishing that DDX6 is a bona fide ATP-dependent RNA helicase rather than merely an RNA-binding scaffold defined its core enzymatic capability.","evidence":"Surface plasmon resonance RNA binding and in vitro unwinding assays with recombinant rck/p54 on c-myc RNA, plus deletion mapping of the C-terminal domain","pmids":["12875652"],"confidence":"Medium","gaps":["Physiological substrates beyond c-myc RNA not defined","No structural basis for the ATP dependence resolved here"]},{"year":2006,"claim":"A crystal structure of the N-terminal core resolved why DDX6 ATPase is uniquely regulated and linked the enzyme to cell-cycle control.","evidence":"X-ray crystallography of Nc-rck/p54 revealing an Asn131-induced closed P-loop, plus IRES helicase and HeLa cell-cycle assays","pmids":["16611246"],"confidence":"High","gaps":["How partner binding relieves the closed conformation not shown","Link between c-myc downregulation and G2/M arrest correlative"]},{"year":2006,"claim":"Placing DDX6 physically within active RISC and showing it is required for miRNA repression but not siRNA cleavage separated the translational-repression arm of silencing from endonucleolytic cleavage.","evidence":"Affinity purification of active RISC, reciprocal Co-IP with Ago1/Ago2, and knockdown rescue across multiple miRNA targets in human cells","pmids":["16756390"],"confidence":"High","gaps":["Molecular bridge connecting DDX6 to Ago not defined here","Whether interaction is direct or via adaptors unresolved"]},{"year":2009,"claim":"Mapping the FDF-motif binding groove on DDX6 explained how decapping activators and translational repressors compete for the helicase, defining a mutually exclusive interaction hub.","evidence":"Crystal structure of the DDX6 RecA-like domain bound to the EDC3 FDF peptide, competition assays, and Me31B FDF-surface mutagenesis with P-body and repression readouts","pmids":["19285948"],"confidence":"High","gaps":["Functional consequence of switching between EDC3 and Tral occupancy in vivo not resolved","How competition is regulated temporally unknown"]},{"year":2014,"claim":"Structural and biochemical definition of the CNOT1 MIF4G–DDX6 RecA2 interface revealed how miRNA target recognition is physically coupled to the CCR4-NOT repression/decay machinery, mirroring eIF4A–eIF4G.","evidence":"Crystal structures of the DDX6–CNOT1 MIF4G complex, ATPase stimulation assays, structure-guided mutagenesis, and miRNA reporter assays, independently replicated and confirmed by Co-IP in human cells","pmids":["24768538","24768540","25035296"],"confidence":"High","gaps":["How CNOT1 binding integrates with simultaneous FDF-partner engagement not fully resolved","Dynamics of conformational activation in cells not measured"]},{"year":2015,"claim":"A ternary 4E-T/DDX6/CNOT1 structure distinguished 4E-T's stable, CNOT1-independent binding from the displaceable FDF partners, refining the architecture of repressive mRNPs.","evidence":"2.1-Å crystal structure of the 4E-T CHD/DDX6/CNOT1 MIF4G complex with in vitro competition assays","pmids":["26489469"],"confidence":"High","gaps":["In vivo stoichiometry of the ternary complex not measured","How 4E-T persistence affects partner exchange in cells unresolved"]},{"year":2015,"claim":"Systematic interactome mapping placed DDX6 in distinct decapping, CPEB-like, and Ataxin2 complexes and defined a minimal P-body assembly module of DDX6/4E-T/LSM14A separable from decay.","evidence":"Tandem affinity purification mass spectrometry and P-body assembly assays with component knockdowns","pmids":["25995375"],"confidence":"Medium","gaps":["Which complexes are simultaneous versus mutually exclusive not resolved","Functional output of each complex not individually dissected"]},{"year":2019,"claim":"Demonstrating that P-body dissolution upon DDX6 loss de-represses fate-instructive factors connected DDX6-driven translational sequestration to control of the pluripotent state and chromatin landscape.","evidence":"DDX6 knockout in human and mouse ESCs with polysome profiling, ATAC-seq, ChIP-seq, methylation profiling, and P-body imaging","pmids":["31588046"],"confidence":"High","gaps":["Which specific repressed mRNAs are causal for the phenotype not pinpointed","Direct versus indirect chromatin effects not separated"]},{"year":2019,"claim":"Identification of de novo RecA2-domain missense variants causing P-body and partner-binding defects established DDX6 as a human disease gene and validated RecA2 integrity in vivo.","evidence":"Patient-derived cell P-body assays, IP of DDX6 variants, complementation, and structural modeling","pmids":["31422817"],"confidence":"Medium","gaps":["Causal mRNA dysregulation underlying clinical phenotype not defined","Genotype-phenotype correlation across variants limited"]},{"year":2017,"claim":"A genome-wide screen and epistasis showed DDX6 restrains interferon-stimulated gene overactivation through the LSM1 mRNA-degradation pathway rather than canonical RNA sensors, defining an innate-immune surveillance role.","evidence":"Genome-wide genetic screen, DDX6 knockout transcriptomics, and double-knockout epistasis with LSM1 and RNA sensors","pmids":["28746868"],"confidence":"High","gaps":["Specific ISG-encoding transcripts targeted not identified","Reconciliation with reported RIG-I-enhancing role unresolved"]},{"year":2022,"claim":"Parallel knockout epistasis in mouse embryos showed DDX6's essential early developmental function operates via the miRNA pathway, not its P-body or decapping arms, separating its multiple activities genetically.","evidence":"Ddx6, Dgcr8, Dcp2, and Eif4enif1 knockout mouse models with EpiLC differentiation and transcriptome epistasis","pmids":["36197846"],"confidence":"High","gaps":["Whether the same partitioning holds in other tissues unknown","Direct miRNA targets controlling BMP inhibitors not fully enumerated"]},{"year":2024,"claim":"Ribosome profiling defined a mechanism by which DDX6, via its RecA2 FDF motif on the ribosome and its ATPase activity, selectively destabilizes inefficiently translated mRNAs, linking translation status to decay.","evidence":"Ribosome profiling, RNA-seq, FDF-motif and ATPase mutagenesis, and reporter mRNA assays","pmids":["38989862"],"confidence":"High","gaps":["How DDX6 senses translation inefficiency mechanistically not resolved","Direct deadenylase coupling at the ribosome not visualized"]},{"year":2024,"claim":"Demonstrating DDX6-driven liquid-liquid phase separation into P-body reservoirs that store low-GC mRNAs tied granule biophysics to metabolic reprogramming and drug sensitivity in cancer.","evidence":"CRISPR screen, DDX6 KO, RIP-seq, RNA-seq, polysome profiling, and metabolic and drug-sensitivity assays in AML","pmids":["41330929"],"confidence":"High","gaps":["Sequence/structural determinants of LLPS within DDX6 not mapped","Whether storage versus decay fate is reversible not resolved"]},{"year":2025,"claim":"Identifying a DDX6–DDX3X interaction required to block 48S preinitiation complex assembly defined the molecular step at which DDX6 represses translation of miRNA targets.","evidence":"DDX3X conditional knockout, DDX6/DDX3X Co-IP, interaction-defective mutant rescue in ESCs, and in vitro 48S assembly assay","pmids":["40923767"],"confidence":"High","gaps":["Whether DDX3X recruitment is constitutive or regulated unknown","Structural basis of the C-terminal DDX6–DDX3X contact not resolved"]},{"year":2025,"claim":"Discovery of non-proteolytic polyubiquitylation of DDX6 by praja2 downstream of cAMP/GPCR signaling provided a signal-responsive switch governing P-body assembly and translational output.","evidence":"Co-IP of praja2/DDX6, ubiquitylation-defective mutant expression, polysome profiling, cAMP stimulation, and GBM proliferation assays","pmids":["40148504"],"confidence":"Medium","gaps":["Ubiquitylated lysine residues and chain topology not mapped","How ubiquitin modification alters DDX6 partner binding mechanistically unclear"]},{"year":null,"claim":"How DDX6's distinct molecular activities—miRNA repression, ribosome-associated decay, granule phase separation, and innate-immune surveillance—are dynamically partitioned and switched within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No integrated model of how competing partner occupancy is regulated in real time","Determinants directing a bound mRNP toward storage versus decay versus reactivation unknown","Post-translational regulation beyond praja2 ubiquitylation uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[7,27,12,16,37]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[7,8,16,24]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1,8,24,27]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,4,6]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[18,24,34]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,11,27,38]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,10,40]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[24,26]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1,24,33]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,18,32]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[21,22]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[18,32,43]}],"complexes":["P-body","CCR4-NOT complex","RISC","mRNA decapping complex"],"partners":["CNOT1","EIF4ENIF1","EDC3","AGO2","DDX3X","ATXN2","LSM14A","YBX1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P26196","full_name":"Probable ATP-dependent RNA helicase DDX6","aliases":["ATP-dependent RNA helicase p54","DEAD box protein 6","Oncogene RCK"],"length_aa":483,"mass_kda":54.4,"function":"Essential for the formation of P-bodies, cytosolic membrane-less ribonucleoprotein granules involved in RNA metabolism through the coordinated storage of mRNAs encoding regulatory functions (PubMed:25995375, PubMed:27342281, PubMed:31422817). Plays a role in P-bodies to coordinate the storage of translationally inactive mRNAs in the cytoplasm and prevent their degradation (PubMed:27342281). In the process of mRNA degradation, plays a role in mRNA decapping (PubMed:16364915). Blocks autophagy in nutrient-rich conditions by repressing the expression of ATG-related genes through degradation of their transcripts (PubMed:26098573)","subcellular_location":"Cytoplasm, P-body; Cytoplasm; Nucleus; Cytoplasm, Cytoplasmic ribonucleoprotein granule","url":"https://www.uniprot.org/uniprotkb/P26196/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/DDX6","classification":"Common Essential","n_dependent_lines":1072,"n_total_lines":1208,"dependency_fraction":0.8874172185430463},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000110367","cell_line_id":"CID001687","localizations":[{"compartment":"big_aggregates","grade":3}],"interactors":[{"gene":"ATXN2L","stoichiometry":10.0},{"gene":"ATXN2","stoichiometry":10.0},{"gene":"FAM195B","stoichiometry":10.0},{"gene":"EDC3","stoichiometry":10.0},{"gene":"NUFIP2","stoichiometry":10.0},{"gene":"LSM14A","stoichiometry":10.0},{"gene":"RPLP1","stoichiometry":4.0},{"gene":"RPL21","stoichiometry":4.0},{"gene":"RPL5","stoichiometry":4.0},{"gene":"RPL22","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001687","total_profiled":1310},"omim":[{"mim_id":"618653","title":"INTELLECTUAL DEVELOPMENTAL DISORDER WITH IMPAIRED LANGUAGE AND DYSMORPHIC FACIES; IDDILF","url":"https://www.omim.org/entry/618653"},{"mim_id":"614660","title":"PAT1 HOMOLOG 1, PROCESSING BODY mRNA DECAY FACTOR; PATL1","url":"https://www.omim.org/entry/614660"},{"mim_id":"610677","title":"LSM14A mRNA PROCESSING BODY ASSEMBLY FACTOR; LSM14A","url":"https://www.omim.org/entry/610677"},{"mim_id":"609844","title":"DECAPPING mRNA 2; DCP2","url":"https://www.omim.org/entry/609844"},{"mim_id":"609842","title":"ENHANCER OF mRNA DECAPPING 3; EDC3","url":"https://www.omim.org/entry/609842"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytoplasmic bodies","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Midbody","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DDX6"},"hgnc":{"alias_symbol":["RCK","Rck/p54"],"prev_symbol":["HLR2"]},"alphafold":{"accession":"P26196","domains":[{"cath_id":"3.40.50.300","chopping":"75-298","consensus_level":"high","plddt":94.7633,"start":75,"end":298},{"cath_id":"3.40.50.300","chopping":"308-472","consensus_level":"high","plddt":94.2448,"start":308,"end":472}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P26196","model_url":"https://alphafold.ebi.ac.uk/files/AF-P26196-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P26196-F1-predicted_aligned_error_v6.png","plddt_mean":84.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DDX6","jax_strain_url":"https://www.jax.org/strain/search?query=DDX6"},"sequence":{"accession":"P26196","fasta_url":"https://rest.uniprot.org/uniprotkb/P26196.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P26196/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P26196"}},"corpus_meta":[{"pmid":"16756390","id":"PMC_16756390","title":"Translation 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[\n    {\n      \"year\": 2006,\n      \"finding\": \"RCK/p54 (DDX6) directly interacts with Argonaute proteins Ago1 and Ago2 in affinity-purified active siRISC and miRISC from human cells. Depletion of RCK/p54 disrupts P-bodies, disperses Ago2 throughout the cytoplasm, releases miRNA-induced translational repression, but does not significantly affect siRNA-mediated RNA cleavage functions of RISC.\",\n      \"method\": \"Affinity purification of active RISC complexes, co-immunoprecipitation, siRNA knockdown with translational repression assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP in active RISC, functional knockdown rescue, replicated across multiple miRNA targets\",\n      \"pmids\": [\"16756390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The CNOT1 MIF4G domain directly recruits DDX6 through interaction with the C-terminal RecA2 domain of DDX6. Crystal structure of the DDX6-CNOT1 MIF4G complex shows striking similarity to the eIF4G-eIF4A complex. CNOT1 modulates the conformation of DDX6 and stimulates its ATPase activity. Structure-based mutations disrupting the CNOT1 MIF4G-DDX6 interaction impair miRNA-mediated repression.\",\n      \"method\": \"Crystal structure determination, ATPase activity assays, structure-guided mutagenesis, miRNA repression assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus biochemical reconstitution plus mutagenesis, independently replicated in concurrent paper (PMID 24768540)\",\n      \"pmids\": [\"24768538\", \"24768540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The CNOT1 MIF4G domain interacts with the C-terminal RecA2 domain of DDX6; the crystal structure of this complex demonstrates that DDX6 binds CNOT1 in a manner analogous to eIF4A binding eIF4G. This interaction connects miRNA target recognition to translational repression and decapping.\",\n      \"method\": \"Crystal structure of DDX6 RecA2–CNOT1 MIF4G complex, biochemical binding assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional validation, independently replicated in concurrent paper (PMID 24768538)\",\n      \"pmids\": [\"24768540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The crystal structure of the DDX6 C-terminal RecA-like domain bound to the FDF motif of decapping activator EDC3 was determined. The FDF peptide adopts an alpha-helical conformation occupying a shallow groove on DDX6 opposite to the RNA-binding and ATP hydrolysis surfaces. The translational repressor Tral contains a similar FDF motif that binds the same surface, making EDC3 and Tral interactions with DDX6/Me31B mutually exclusive. Mutagenesis of Me31B's FDF interaction surface abrogates P-body accumulation and mRNA repression.\",\n      \"method\": \"Crystal structure, mutagenesis of Me31B, competition binding assays, P-body accumulation assays, mRNA repression assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus functional assays in single rigorous study\",\n      \"pmids\": [\"19285948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The 2.1-Å crystal structure of a ternary 4E-T CHD/DDX6/CNOT1 MIF4G complex reveals how the 4E-T CUP-homology domain wraps around the RecA2 domain of DDX6 and contacts CNOT1. Unlike Edc3 and Pat1 FDF motifs, which dissociate from DDX6 upon CNOT1 MIF4G binding in vitro, 4E-T CHD interacts with DDX6 in both the presence and absence of CNOT1.\",\n      \"method\": \"X-ray crystallography (2.1 Å), in vitro binding competition assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure with orthogonal biochemical competition assays\",\n      \"pmids\": [\"26489469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Direct interaction between CNOT1 (large scaffolding subunit of CCR4-NOT) and DDX6 is required for miRISC-mediated gene silencing in human cells. DDX6 binds a conserved CNOT1 subdomain analogous to the eIF4A-eIF4G interaction; mutations disrupting this interaction impair miRNA silencing.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding with purified proteins, mutagenesis, miRNA silencing reporter assays in human cells\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, mutagenesis, and functional silencing assays, consistent with structural data from concurrent papers\",\n      \"pmids\": [\"25035296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The DDX6–4E-T interaction mediates both miRNA-dependent translational repression and de novo P-body assembly. Joint deletion of two short conserved motifs in 4E-T that bind UNR and DDX6 relieves translational repression, partly through the 4E-T–DDX6–CNOT1 axis.\",\n      \"method\": \"Mass spectrometry to map interaction sites, deletion mutagenesis, translational repression reporter assays, P-body assembly microscopy\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (MS, mutagenesis, functional reporters, imaging) in single study\",\n      \"pmids\": [\"27342281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Recombinant rck/p54 specifically binds c-myc RNA transcripts and exhibits ATP-dependent RNA-unwinding activity toward c-myc RNAs in vitro. The C-terminal 184 amino acid domain (aa 289–472) is required for RNA unwinding activity.\",\n      \"method\": \"Surface plasmon resonance RNA binding assay, in vitro helicase/unwinding assay, deletion mutagenesis\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro biochemical assay with deletion mutagenesis, single lab, no replication\",\n      \"pmids\": [\"12875652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of the N-terminal core domain (Nc-rck/p54, residues 70–288) reveals a P-loop in motif I adopting a closed conformation induced by Asn131, a residue unique to the RCK subfamily, such that ATP does not bind this loop in the unliganded state. ATP induces a conformational change bringing N- and C-terminal domains together for RNA unwinding. c-Myc IRES RNA is a substrate for rck/p54-mediated unwinding, and overexpression of rck/p54 in HeLa cells causes G2/M arrest with downregulation of c-myc.\",\n      \"method\": \"X-ray crystallography, dynamic light scattering, in vitro helicase assay, electron microscopy, luciferase IRES assay, cell cycle analysis\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus multiple biochemical assays plus cellular functional readouts in single study\",\n      \"pmids\": [\"16611246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Xp54 (DDX6 ortholog) shuttles between nucleus and cytoplasm via a leucine-rich nuclear export signal (NES) recognized by the CRM1 pathway (blocked by leptomycin B). Xp54 binds nascent transcripts on lampbrush chromosome loops in the nucleus and accompanies mRNA to the cytoplasm by an alternative export pathway, remaining associated with masked mRNA until translational activation.\",\n      \"method\": \"Microinjection of recombinant protein in oocytes, leptomycin B treatment, NES mutagenesis, immunostaining of lampbrush chromosomes, co-immunoprecipitation with de novo RNA\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with pharmacological and genetic perturbation, Xenopus ortholog\",\n      \"pmids\": [\"11839790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DDX6 localizes to both nucleus and cytoplasm in human cells. Nuclear import of DDX6 can be mediated in a piggyback manner by 4E-T, rather than by a canonical NLS/importin-α/β pathway. DDX6 also enters newly formed nuclei by associating ('hitch-hiking') with mitotic chromosomes via its C-terminal domain during M phase.\",\n      \"method\": \"Live-cell imaging, fractionation, co-immunoprecipitation, mitotic chromosome association assays, domain deletion analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional domain analysis, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"28216671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DDX6 interacts with hnRNP K and hnRNP E1 in a DICE (differentiation control element)-dependent manner in erythroid K562 cells. DDX6 colocalizes with endogenous hr15-LOX mRNA in P-body-like RNP granules from which 60S ribosomal subunits are excluded. DDX6 knockdown disrupts storage of hr15-LOX mRNA in these granules, indicating DDX6 maintains translational silencing by recruiting silenced mRNA to P-body-like storage compartments.\",\n      \"method\": \"RNA chromatography with DICE as bait, hnRNP K immunoprecipitation, RNAi knockdown, FISH co-localization, ribosomal fractionation\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RNA affinity, Co-IP, RNAi, FISH) in single lab study\",\n      \"pmids\": [\"20884783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DDX6 binds the DB1 and DB2 stem-loop structures in the dengue virus 3' UTR in vitro, and this interaction occurs in vivo during DENV infection. DDX6 knockdown reduces infectious particle production and viral RNA levels. DDX6 colocalizes with the DENV replication complex.\",\n      \"method\": \"RNA chromatography with quantitative mass spectrometry, in vitro RNA-protein binding assays, siRNA knockdown, immunofluorescence co-localization\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro RNA binding mapped to specific structures plus in vivo interaction confirmation, single lab\",\n      \"pmids\": [\"21957497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DDX6 helicase activity (DEAD-box motif II) is required for efficient HCV replication. A helicase-deficient DQAD mutant has a dominant-negative effect reducing HCV yields, whereas overexpression of DDX6 enhances replication. An intracellular complex containing DDX6, HCV core protein, and both viral and cellular RNAs is formed in a C-terminal domain-dependent but helicase-activity-independent manner.\",\n      \"method\": \"siRNA knockdown and rescue with siRNA-resistant mutant, overexpression of helicase-dead (DQAD) mutant, co-immunoprecipitation\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis with rescue, Co-IP for complex identification, single lab\",\n      \"pmids\": [\"20392846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DDX6 acts enzymatically (ATPase/helicase activity required) to facilitate HIV-1 capsid assembly, specifically at the step of Gag multimerization at the plasma membrane. Assembling HIV-1 co-opts a preexisting host complex containing ABCE1 and PB proteins including DDX6. DDX6 knockdown reduces production of infectious HIV-1 from primary human T cells.\",\n      \"method\": \"Co-immunoprecipitation, immunoelectron microscopy, siRNA knockdown with rescue, localization of assembly defect by IEM\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IEM localization plus functional knockdown/rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"22851315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DDX6 ATPase/helicase motif is essential for foamy virus genome packaging. During infection, DDX6 relocalizes from P-bodies/stress granules to the pericentriolar viral assembly site. DDX6 does not stably interact with Gag proteins and is not incorporated into virions, suggesting it transiently remodels viral RNA–Gag RNP to facilitate genome encapsidation.\",\n      \"method\": \"siRNA knockdown, ATPase mutant rescue, immunofluorescence relocalization, viral RNA quantification in particles\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional mutagenesis plus localization imaging, single lab\",\n      \"pmids\": [\"22022269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DDX6 interacts with CUG triplet-repeat RNA in primary fibroblasts from DM1 patients and unwinds CUG-repeat duplexes in vitro in an ATP-dependent manner. DDX6 overexpression causes relocation of CUG-expanded DMPK-mRNA foci from nucleus to cytoplasm and dispersal of MBNL1, relieving DM1 mis-splicing. Knockdown of DDX6 increases nuclear DMPK-mRNA foci and MBNL1 sequestration.\",\n      \"method\": \"RIP (RNA immunoprecipitation) in patient fibroblasts, in vitro CUG-RNA unwinding assay, DDX6 overexpression and knockdown with splicing assays, immunofluorescence\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro unwinding assay plus cellular gain/loss-of-function with splicing readout, single lab\",\n      \"pmids\": [\"24792155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DDX6 associates with YBX1 to bind stem loops in the 3' UTRs of CDK1 and EZH2 mRNAs and recruits them to eIF4E to facilitate translation, maintaining progenitor self-renewal. DDX6 also associates with mRNA degradation proteins to degrade KLF4 mRNA (differentiation inducer) via its 5' UTR. Loss of DDX6 in epidermal progenitor cells causes premature differentiation and decreased proliferation.\",\n      \"method\": \"Co-immunoprecipitation with YBX1, mRNA pull-down, polysome profiling, RNAi knockdown in epidermal progenitors with differentiation/proliferation phenotypic readouts\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, mRNA binding assays, cellular loss-of-function with specific phenotype, single lab\",\n      \"pmids\": [\"26412305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DDX6 mediates translational suppression of target mRNAs in P-bodies; loss of DDX6 dissolves P-bodies, releasing mRNAs encoding fate-instructive transcription and chromatin factors into the ribosome pool. Increased translation of these targets rewires enhancer, heterochromatin, and DNA methylation landscapes, endowing primed ESCs with a hyper-pluripotent, differentiation-resistant state.\",\n      \"method\": \"DDX6 knockdown/knockout in human and mouse ESCs, polysome profiling, ATAC-seq, ChIP-seq, DNA methylation profiling, P-body imaging\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal omics and functional methods, replicated in human and mouse systems\",\n      \"pmids\": [\"31588046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"De novo missense variants in the RecA-2 domain of DDX6 (p.His372Arg, p.Arg373Gln, p.Cys390Arg, p.Thr391Ile, p.Thr391Pro) cause P-body assembly defects and disrupt interactions with protein partners in immunoprecipitation assays, establishing that RecA-2 domain integrity is required for P-body assembly and partner binding in human cells.\",\n      \"method\": \"Patient-derived fibroblast and cell line P-body assembly assays, immunoprecipitation of DDX6 variants, complementation assays, structural modeling\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional cellular assays with multiple patient variants and complementation, single consortium study\",\n      \"pmids\": [\"31422817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Recombinant DDX6 inhibits VEGF IRES-mediated translation in normoxic MCF-7 cell extracts. DDX6 interacts with the VEGF mRNA 5' UTR by RNA affinity chromatography. Under hypoxia, DDX6 protein levels decline and its interaction with VEGF mRNA is diminished; DDX6 depletion by RNAi further promotes VEGF expression and vascular tube formation.\",\n      \"method\": \"In vitro IRES-translation assay with recombinant DDX6, RNA affinity chromatography/mass spectrometry, RNAi knockdown, VEGF secretion and HUVEC tube formation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro translation inhibition plus cellular RNAi with functional readout, single lab\",\n      \"pmids\": [\"23293030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DDX6 deficiency causes global upregulation of interferon-stimulated genes (ISGs) in a cell-intrinsic manner, imposing an antiviral state. Epistatic analysis showed ISG activation cannot be overcome by deletion of canonical RNA sensors, but DDX6 deficiency is suppressed by disrupting LSM1 (mRNA degradation machinery component), placing DDX6 in a pathway that limits aberrant ISG activation through RNA degradation.\",\n      \"method\": \"Genome-wide genetic screen, DDX6 knockout with transcriptomics, epistasis analysis (double knockout with LSM1 and RNA sensors), viral infection assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide screen plus genetic epistasis with multiple double-KO combinations, functional antiviral phenotype\",\n      \"pmids\": [\"28746868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DDX6 associates with RIG-I; their interaction increases after influenza B virus infection. DDX6 augments RIG-I-mediated induction of IFN-β expression. DDX6 binds viral RNA capable of stimulating RIG-I, suggesting it functions as an RNA co-sensor and signaling enhancer for RIG-I.\",\n      \"method\": \"Affinity purification/quantitative mass spectrometry, co-immunoprecipitation, IFN-β reporter assay, viral RNA binding assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus functional IFN reporter assay, single lab\",\n      \"pmids\": [\"29949917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DDX6 limits stress granule formation in an ATPase and RNA-binding dependent manner, independent of P-body formation. Loss of DDX6 (along with 4E-T and DCP1A) increases P-body docking with stress granules in a manner dependent on CNOT1 and PAT1B.\",\n      \"method\": \"DDX6 knockout, ATPase mutant rescue, stress granule and P-body live imaging, co-localization analysis, epistasis with CNOT1/PAT1B knockdowns\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout plus structure-function mutants plus epistasis, single lab\",\n      \"pmids\": [\"38536035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DDX6 triggers deadenylation-dependent decay of inefficiently translated mRNAs. DDX6 interacts with the ribosome through its RecA2-domain FDF motif. Both RecA2-mediated interactions and ATPase activity are required for DDX6 to destabilize inefficiently translated mRNAs. Ribosome profiling identifies two classes of DDX6-regulated endogenous mRNAs: those with poor overall translation efficiency and those with locally reduced ribosome translocation rates.\",\n      \"method\": \"Ribosome profiling, RNA sequencing, FDF-motif mutagenesis, reporter mRNA assays, ATPase mutant analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal approaches (ribosome profiling, reporter assays, mutagenesis) demonstrating mechanism, single rigorous study\",\n      \"pmids\": [\"38989862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DDX6 helicase activity (E247A mutant is inactive) is required for maintaining proper separation of P-bodies from stress granules under stress. DDX6 deficiency results in formation of irregular 'hybrid' PB/SG granules. The interactions of DDX6 with CNOT1 and 4E-T modulate both P-body and stress granule biogenesis.\",\n      \"method\": \"DDX6 knockout cell lines, helicase-dead E247A mutant rescue, fluorescence microscopy of PB and SG markers, CNOT1/4E-T knockdown epistasis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — structure-function mutagenesis plus epistasis with partner proteins, single lab\",\n      \"pmids\": [\"37427791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DDX6 interactome by TAP-MS identifies three main complexes: the decapping complex, a CPEB-like complex, and an Ataxin2/Ataxin2L complex; the exon junction complex (EJC) was also found, suggesting DDX6 binding to newly exported mRNAs. Some DDX6 associates with polysomes. P-body assembly requires DDX6 together with 4E-T and LSM14A in all tested conditions, whereas decay complex proteins are dispensable for P-body assembly per se.\",\n      \"method\": \"Tandem affinity purification (TAP) with mass spectrometry, P-body assembly assays under multiple conditions, knockdown of individual components\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic interactome mapping with functional P-body assembly assays, single lab\",\n      \"pmids\": [\"25995375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rck/p54 (DDX6) binds RNA with no sequence specificity and high nanomolar affinity. RNA binding is ATP-independent, but relaxing (unwinding) of bound RNA requires ATP (not ATP hydrolysis). Rck/p54 is in large molecular excess relative to cellular mRNAs and is enriched to ~0.5 mM in P-bodies, organized in clusters, with multiple Rck/p54 proteins binding along individual mRNA molecules in vivo.\",\n      \"method\": \"In vitro RNA binding assays with purified protein, RNA conformation assays, quantitative immunofluorescence of P-bodies, in vivo crosslinking\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical characterization plus in vivo quantitative imaging, single lab\",\n      \"pmids\": [\"22836354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DDX6 binds 7SK snRNA and causes release and transfer of P-TEFb from 7SK snRNP to the AF4/AFF1 super elongation complex (SEC). DDX6 binds stably to AF4 and AF4N as demonstrated by GST pull-down and co-immunoprecipitation. Overexpression of DDX6 increases cellular mRNA production ~5–6 fold; knockdown of DDX6 decreases mRNA production by ~70%.\",\n      \"method\": \"7SK snRNA binding assay, GST pull-down, co-immunoprecipitation, mRNA production assay with overexpression and knockdown\",\n      \"journal\": \"American journal of blood research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single Co-IP and pull-down methods without deep mechanistic resolution\",\n      \"pmids\": [\"27679741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Drosophila circadian pacemaker neurons, ME31B/DDX6 is required for ATX2 association with NOT1, enabling NOT1-mediated gene silencing. The ME31B/DDX6–NOT1 complex supports high-amplitude behavioral rhythms independently of PERIOD (PER) translation. LSM12 separately acts as a molecular adaptor recruiting TYF to ATX2 for TYF-dependent PER translation.\",\n      \"method\": \"Genetic interaction assays in Drosophila, co-immunoprecipitation of ATX2/NOT1/ME31B, behavioral rhythm analysis, molecular epistasis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus genetic epistasis with behavioral phenotype, Drosophila ortholog\",\n      \"pmids\": [\"28388438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Ataxin-2 directly interacts with DDX6, a component of P-bodies and stress granules. Altered ataxin-2 levels interfere with assembly of stress granules and P-bodies. Ataxin-2 also regulates the intracellular concentration of poly(A)-binding protein (PABP), another interaction partner.\",\n      \"method\": \"Co-immunoprecipitation, overexpression/knockdown of ataxin-2, immunofluorescence of P-bodies and stress granules\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus functional imaging assays, replicated across conditions\",\n      \"pmids\": [\"17392519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PolyQ-expanded (PQE) ataxin-2 sequesters DDX6 into aggregates via RNA sequences. The N-terminal LSm domain of ataxin-2 (residues 82–184) and the C-terminal helicase domain of DDX6 mediate this interaction. Sequestration of DDX6 impairs P-body assembly, releasing MARF1 endoribonuclease and promoting mRNA decay and translational repression, which can be rescued by restoring DDX6 protein levels.\",\n      \"method\": \"Biochemical fractionation, fluorescence imaging, domain mapping by Co-IP with truncation mutants, rescue experiments by DDX6 restoration\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping plus functional rescue assays, single lab\",\n      \"pmids\": [\"38810698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In early mouse embryogenesis, DDX6 prevents aberrant upregulation of BMP signaling inhibitors through miRNA-mediated gene silencing. Ddx6 knockout phenocopies Dgcr8 (miRNA pathway) knockout but not Dcp2 (decapping) or Eif4enif1 (4E-T, P-body) knockout, establishing that DDX6's early developmental function is primarily via the miRNA pathway rather than P-body-related functions.\",\n      \"method\": \"Ddx6 KO mice, Dgcr8 KO, Dcp2 KO, Eif4enif1 KO mouse models, in vitro EpiLC differentiation assay, transcriptome analysis, genetic epistasis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple parallel KO models providing clear pathway placement, replicated across in vivo and in vitro systems\",\n      \"pmids\": [\"36197846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DDX6 is a positive regulator of the Ataxin-2/PAPD4 cytoplasmic polyadenylation machinery. DDX6 interacts with Ataxin-2, PABPC1, and PAPD4 in immunoprecipitation assays. DDX6 downregulation increases Ataxin-2 target mRNAs with short poly(A) tails and reduces their protein levels, similar to Ataxin-2 downregulation. DDX6 likely promotes binding of Ataxin-2 to target mRNAs to maintain poly(A) tail length.\",\n      \"method\": \"LC-MS/MS interactome analysis, Co-IP, siRNA knockdown of DDX6/Ataxin-2, poly(A) tail length assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP plus knockdown phenotype, single lab, limited mechanistic resolution\",\n      \"pmids\": [\"33756349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DDX6 interacts directly with DDX3X via its C-terminal region; this interaction is required for DDX6-mediated translational repression in miRNA-mediated silencing. DDX6 mutant defective in DDX3X interaction cannot rescue miRNA silencing defects in ESCs and fails to inhibit 48S preinitiation complex formation in vitro.\",\n      \"method\": \"Conditional knockout of DDX3X, biochemical Co-IP of DDX6/DDX3X, DDX6 interaction-defective mutant rescue assay, in vitro 48S preinitiation complex assembly assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution of 48S inhibition plus mutagenesis plus cellular rescue assays, single rigorous study\",\n      \"pmids\": [\"40923767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"E3 ubiquitin ligase praja2 forms a complex with DDX6 and promotes P-body assembly through non-proteolytic polyubiquitylation of DDX6 upon cAMP/GPCR signaling. Expression of ubiquitylation-defective DDX6 mutant suppresses P-body assembly and sustains GBM growth. Genetic inactivation of praja2 reshapes DDX6/mRNA complexes and translating polysomes, promoting cellular senescence and GBM growth arrest.\",\n      \"method\": \"Co-immunoprecipitation of praja2/DDX6 complex, ubiquitylation-defective mutant expression, polysome profiling, cAMP stimulation, GBM cell proliferation assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitylation mutant rescue plus functional cellular assays, single lab\",\n      \"pmids\": [\"40148504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Overexpression of rck/p54 in COS7 and SW480 colorectal cancer cells causes an increase in c-myc protein levels by enhancing translation efficiency and/or stabilizing c-myc mRNA.\",\n      \"method\": \"Transfection overexpression, Western blot, translational efficiency assessment\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — overexpression phenotype with limited mechanistic resolution, single lab\",\n      \"pmids\": [\"11751426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DDX6 binds the dengue virus 3' UTR A3 element RNA hairpin with nanomolar affinity; three conserved basic residues (Lys307, Lys367, Arg369) and an unstructured C-terminal extension are required. Alanine substitution of these residues results in RNA-independent ATPase activity, indicating RNA binding and ATPase activities are coupled. DDX6-mediated interaction with DENV A3 element contributes to G1/S cell cycle arrest during infection; DDX6 overexpression rescues DNA preinitiation complex expression.\",\n      \"method\": \"Binding affinity measurements, mutagenesis of DDX6 basic residues, DDX6 CLIP in infected cells, ATPase activity assay, cell cycle analysis, rescue of DNA replication complex\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis-linked biochemical and cellular assays, single lab\",\n      \"pmids\": [\"34132569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DDX6 undergoes liquid-liquid phase separation (LLPS) to form P-bodies that serve as 'reservoirs' for DDX6-bound mRNAs with low GC content. DDX6 KO leads to P-body dissolution and release of sequestered mRNAs (including BCAT1) into the cytosol for degradation, thereby reprogramming amino acid metabolism and sensitizing AML cells to cytarabine.\",\n      \"method\": \"In vitro and in vivo CRISPR screen, DDX6 KO, RIP-seq, RNA-seq, polysome profiling, metabolic assays, drug sensitivity assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide CRISPR screen, RIP-seq mapping of DDX6-bound mRNAs, metabolic readout, replicated in vitro and in vivo\",\n      \"pmids\": [\"41330929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DDX6 is strongly associated with NF-κB pathway components p65/RelA and IκBα (but not TRADD, RIP, or TRAF2) by co-immunoprecipitation. Forced expression of DDX6 enhances NF-κB promoter activity independent of its RNA helicase activity. DDX6 silencing reduces TNF-α-induced phosphorylation of p65 and IκBα, nuclear localization of p65, and IκBα protein levels.\",\n      \"method\": \"Co-immunoprecipitation, NF-κB reporter assay with helicase-inactive mutant, siRNA knockdown, immunofluorescence of p65 nuclear localization, imiquimod dermatitis mouse model\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with helicase-dead mutant plus functional reporter assays, single lab\",\n      \"pmids\": [\"38377944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ADAR1 interacts with DDX6 in the nucleus. DDX6 functions as a negative regulator of cellular ADAR1p110 and ADAR2 editing activity, as assessed by a dual-fluorescence reporter assay. Depletion of DDX6 facilitates RA-induced neuronal differentiation.\",\n      \"method\": \"Nuclear fraction mass spectrometry/immunoprecipitation, dual-fluorescence RNA editing reporter assay, DDX6 knockdown in neuronal differentiation model\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP plus reporter assay, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"36834609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NMDAR stimulation causes S387 phosphorylation of Ago2, which recruits DDX6 to RISC. DDX6 recruitment to RISC is required for NMDAR-dependent silencing of Limk1 mRNA via miR-134 (but not Apt1 via miR-138), and is essential for NMDAR-dependent dendritic spine shrinkage.\",\n      \"method\": \"Ago2 S387 phosphorylation assays, DDX6 knockdown in neurons, mRNA-specific RISC RIP, dendritic spine morphology assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional RNAi with specific mRNA and spine morphology readouts, single lab\",\n      \"pmids\": [\"38321143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In Drosophila germline, mutations in the helicase domain, N-terminal domain, C-terminal domain, and FDF-binding motif of Me31B/DDX6 by CRISPR cause distinct defects in fertility, oogenesis, embryo patterning, and germline mRNA regulation, demonstrating that different motifs contribute distinct functions in vivo.\",\n      \"method\": \"CRISPR mutagenesis of specific motifs, Drosophila germline phenotype analysis, mRNA regulation assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo CRISPR structure-function analysis with multiple distinct mutants, Drosophila ortholog\",\n      \"pmids\": [\"37235728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DDX6 is required for NANOS2 localization and function in mouse male germ cells. DDX6-null germ cells show both P-body-dependent and P-body-independent defects compared to NANOS2-null germ cells, demonstrating that NANOS2 function is carried out via both DDX6/P-body-dependent and -independent mechanisms.\",\n      \"method\": \"Germ cell-specific Cre-mediated Ddx6 deletion in chimeric embryos, comparative phenotype analysis vs. NANOS2-null, RNA-seq\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional genetic KO with comparative epistatic analysis and RNA-seq, single lab\",\n      \"pmids\": [\"30679547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DDX6 antagonizes PI3K-AKT signaling in mouse oocytes to maintain primordial follicles. Oocyte-specific Ddx6 knockout causes P-body-like granule disassembly, abnormal oocyte enlargement via enhanced PI3K-AKT signaling, and premature depletion of primordial follicles. Conversely, forced activation of PI3K-AKT (by Pten KO) disassembles P-body-like granules, supporting mutual antagonism between DDX6/P-bodies and PI3K-AKT signaling.\",\n      \"method\": \"Oocyte-specific Cre (Gdf9-iCre) conditional Ddx6 KO mice, Pten KO epistasis, immunofluorescence of P-body markers, follicle counting\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO plus genetic epistasis with Pten KO, single lab\",\n      \"pmids\": [\"37067907\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DDX6 (RCK/p54) is a conserved DEAD-box RNA helicase that functions as a central hub in post-transcriptional gene regulation: it is recruited to miRNA-targeted mRNAs via direct interaction of its RecA2 domain with the CNOT1 MIF4G domain (structurally analogous to eIF4A–eIF4G), where it represses translation (requiring its ATPase activity and, newly identified, interaction with DDX3X to block 48S preinitiation complex assembly) and promotes deadenylation-dependent mRNA decay of inefficiently translated mRNAs through its ribosome-associated FDF motif; it also interacts with Argonaute proteins in RISC, EDC3 and Pat1 decapping activators (mutually exclusively via their FDF motifs on the same RecA2 groove), and the translational repressor 4E-T (via a ternary complex with CNOT1), together driving P-body assembly that sequesters repressed mRNPs; additionally, DDX6 limits aberrant stress granule formation, participates in innate immune signaling by enhancing RIG-I-mediated IFN-β induction and suppressing ISG overactivation via the mRNA degradation machinery, and undergoes non-proteolytic polyubiquitylation by praja2 downstream of cAMP signaling to regulate P-body assembly and translational output.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DDX6 (RCK/p54) is a conserved DEAD-box ATP-dependent RNA helicase that serves as a central scaffold for post-transcriptional gene regulation, coupling miRNA-mediated silencing, translational repression, mRNA decay, and cytoplasmic RNP granule assembly [#1, #18, #24]. It is recruited to miRNA-targeted transcripts through a direct interaction between its C-terminal RecA2 domain and the CNOT1 MIF4G domain, an arrangement structurally analogous to the eIF4A–eIF4G interaction that simultaneously stimulates DDX6 ATPase activity and links target recognition by the CCR4-NOT deadenylase to repression [#1, #2, #5]. DDX6 binds RNA without sequence specificity at high affinity, and ATP binding (not hydrolysis) drives relaxation of bound RNA; its concentration in cells far exceeds that of mRNA, consistent with coating transcripts within granules [#27]. The same shallow RecA2 groove engages the FDF motifs of the decapping activator EDC3 and translational repressor Tral/Pat1 in a mutually exclusive manner, while the 4E-T CUP-homology domain binds DDX6 alongside CNOT1 in a ternary complex, and DDX6's own RecA2 FDF motif tethers it to the ribosome to trigger deadenylation-dependent decay of inefficiently translated mRNAs [#3, #4, #24]. Translational repression additionally requires direct interaction with DDX3X to block 48S preinitiation complex assembly [#34]. Through these interactions DDX6 drives liquid-liquid phase separation into P-bodies that sequester repressed mRNPs, with 4E-T and LSM14A as obligate co-factors, and it concurrently limits aberrant stress granule formation in an ATPase- and RNA-binding–dependent manner [#26, #38, #23]. This activity governs cell-fate decisions: loss of DDX6 dissolves P-bodies and de-represses fate-instructive factors to lock embryonic stem cells in a hyper-pluripotent state, while in early embryogenesis its essential function operates through the miRNA pathway rather than P-body or decapping arms [#18, #32]. DDX6 also restrains innate antiviral responses, limiting interferon-stimulated gene overactivation via the LSM1-dependent mRNA degradation machinery [#21]. De novo missense variants in the DDX6 RecA2 domain disrupt partner binding and P-body assembly, establishing this domain's integrity as required for human neurodevelopmental function [#19].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing that DDX6 is a bona fide ATP-dependent RNA helicase rather than merely an RNA-binding scaffold defined its core enzymatic capability.\",\n      \"evidence\": \"Surface plasmon resonance RNA binding and in vitro unwinding assays with recombinant rck/p54 on c-myc RNA, plus deletion mapping of the C-terminal domain\",\n      \"pmids\": [\"12875652\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological substrates beyond c-myc RNA not defined\", \"No structural basis for the ATP dependence resolved here\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"A crystal structure of the N-terminal core resolved why DDX6 ATPase is uniquely regulated and linked the enzyme to cell-cycle control.\",\n      \"evidence\": \"X-ray crystallography of Nc-rck/p54 revealing an Asn131-induced closed P-loop, plus IRES helicase and HeLa cell-cycle assays\",\n      \"pmids\": [\"16611246\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How partner binding relieves the closed conformation not shown\", \"Link between c-myc downregulation and G2/M arrest correlative\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placing DDX6 physically within active RISC and showing it is required for miRNA repression but not siRNA cleavage separated the translational-repression arm of silencing from endonucleolytic cleavage.\",\n      \"evidence\": \"Affinity purification of active RISC, reciprocal Co-IP with Ago1/Ago2, and knockdown rescue across multiple miRNA targets in human cells\",\n      \"pmids\": [\"16756390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular bridge connecting DDX6 to Ago not defined here\", \"Whether interaction is direct or via adaptors unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mapping the FDF-motif binding groove on DDX6 explained how decapping activators and translational repressors compete for the helicase, defining a mutually exclusive interaction hub.\",\n      \"evidence\": \"Crystal structure of the DDX6 RecA-like domain bound to the EDC3 FDF peptide, competition assays, and Me31B FDF-surface mutagenesis with P-body and repression readouts\",\n      \"pmids\": [\"19285948\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of switching between EDC3 and Tral occupancy in vivo not resolved\", \"How competition is regulated temporally unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Structural and biochemical definition of the CNOT1 MIF4G–DDX6 RecA2 interface revealed how miRNA target recognition is physically coupled to the CCR4-NOT repression/decay machinery, mirroring eIF4A–eIF4G.\",\n      \"evidence\": \"Crystal structures of the DDX6–CNOT1 MIF4G complex, ATPase stimulation assays, structure-guided mutagenesis, and miRNA reporter assays, independently replicated and confirmed by Co-IP in human cells\",\n      \"pmids\": [\"24768538\", \"24768540\", \"25035296\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CNOT1 binding integrates with simultaneous FDF-partner engagement not fully resolved\", \"Dynamics of conformational activation in cells not measured\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"A ternary 4E-T/DDX6/CNOT1 structure distinguished 4E-T's stable, CNOT1-independent binding from the displaceable FDF partners, refining the architecture of repressive mRNPs.\",\n      \"evidence\": \"2.1-Å crystal structure of the 4E-T CHD/DDX6/CNOT1 MIF4G complex with in vitro competition assays\",\n      \"pmids\": [\"26489469\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo stoichiometry of the ternary complex not measured\", \"How 4E-T persistence affects partner exchange in cells unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Systematic interactome mapping placed DDX6 in distinct decapping, CPEB-like, and Ataxin2 complexes and defined a minimal P-body assembly module of DDX6/4E-T/LSM14A separable from decay.\",\n      \"evidence\": \"Tandem affinity purification mass spectrometry and P-body assembly assays with component knockdowns\",\n      \"pmids\": [\"25995375\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which complexes are simultaneous versus mutually exclusive not resolved\", \"Functional output of each complex not individually dissected\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating that P-body dissolution upon DDX6 loss de-represses fate-instructive factors connected DDX6-driven translational sequestration to control of the pluripotent state and chromatin landscape.\",\n      \"evidence\": \"DDX6 knockout in human and mouse ESCs with polysome profiling, ATAC-seq, ChIP-seq, methylation profiling, and P-body imaging\",\n      \"pmids\": [\"31588046\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific repressed mRNAs are causal for the phenotype not pinpointed\", \"Direct versus indirect chromatin effects not separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of de novo RecA2-domain missense variants causing P-body and partner-binding defects established DDX6 as a human disease gene and validated RecA2 integrity in vivo.\",\n      \"evidence\": \"Patient-derived cell P-body assays, IP of DDX6 variants, complementation, and structural modeling\",\n      \"pmids\": [\"31422817\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal mRNA dysregulation underlying clinical phenotype not defined\", \"Genotype-phenotype correlation across variants limited\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"A genome-wide screen and epistasis showed DDX6 restrains interferon-stimulated gene overactivation through the LSM1 mRNA-degradation pathway rather than canonical RNA sensors, defining an innate-immune surveillance role.\",\n      \"evidence\": \"Genome-wide genetic screen, DDX6 knockout transcriptomics, and double-knockout epistasis with LSM1 and RNA sensors\",\n      \"pmids\": [\"28746868\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ISG-encoding transcripts targeted not identified\", \"Reconciliation with reported RIG-I-enhancing role unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Parallel knockout epistasis in mouse embryos showed DDX6's essential early developmental function operates via the miRNA pathway, not its P-body or decapping arms, separating its multiple activities genetically.\",\n      \"evidence\": \"Ddx6, Dgcr8, Dcp2, and Eif4enif1 knockout mouse models with EpiLC differentiation and transcriptome epistasis\",\n      \"pmids\": [\"36197846\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same partitioning holds in other tissues unknown\", \"Direct miRNA targets controlling BMP inhibitors not fully enumerated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Ribosome profiling defined a mechanism by which DDX6, via its RecA2 FDF motif on the ribosome and its ATPase activity, selectively destabilizes inefficiently translated mRNAs, linking translation status to decay.\",\n      \"evidence\": \"Ribosome profiling, RNA-seq, FDF-motif and ATPase mutagenesis, and reporter mRNA assays\",\n      \"pmids\": [\"38989862\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How DDX6 senses translation inefficiency mechanistically not resolved\", \"Direct deadenylase coupling at the ribosome not visualized\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrating DDX6-driven liquid-liquid phase separation into P-body reservoirs that store low-GC mRNAs tied granule biophysics to metabolic reprogramming and drug sensitivity in cancer.\",\n      \"evidence\": \"CRISPR screen, DDX6 KO, RIP-seq, RNA-seq, polysome profiling, and metabolic and drug-sensitivity assays in AML\",\n      \"pmids\": [\"41330929\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sequence/structural determinants of LLPS within DDX6 not mapped\", \"Whether storage versus decay fate is reversible not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identifying a DDX6–DDX3X interaction required to block 48S preinitiation complex assembly defined the molecular step at which DDX6 represses translation of miRNA targets.\",\n      \"evidence\": \"DDX3X conditional knockout, DDX6/DDX3X Co-IP, interaction-defective mutant rescue in ESCs, and in vitro 48S assembly assay\",\n      \"pmids\": [\"40923767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DDX3X recruitment is constitutive or regulated unknown\", \"Structural basis of the C-terminal DDX6–DDX3X contact not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery of non-proteolytic polyubiquitylation of DDX6 by praja2 downstream of cAMP/GPCR signaling provided a signal-responsive switch governing P-body assembly and translational output.\",\n      \"evidence\": \"Co-IP of praja2/DDX6, ubiquitylation-defective mutant expression, polysome profiling, cAMP stimulation, and GBM proliferation assays\",\n      \"pmids\": [\"40148504\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitylated lysine residues and chain topology not mapped\", \"How ubiquitin modification alters DDX6 partner binding mechanistically unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DDX6's distinct molecular activities—miRNA repression, ribosome-associated decay, granule phase separation, and innate-immune surveillance—are dynamically partitioned and switched within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No integrated model of how competing partner occupancy is regulated in real time\", \"Determinants directing a bound mRNP toward storage versus decay versus reactivation unknown\", \"Post-translational regulation beyond praja2 ubiquitylation uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [7, 27, 12, 16, 37]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [7, 8, 16, 24]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1, 8, 24, 27]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 4, 6]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [18, 24, 34]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 11, 27, 38]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 10, 40]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [24, 26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 24, 33]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 18, 32]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [21, 22]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [18, 32, 43]}\n    ],\n    \"complexes\": [\"P-body\", \"CCR4-NOT complex\", \"RISC\", \"mRNA decapping complex\"],\n    \"partners\": [\"CNOT1\", \"EIF4ENIF1\", \"EDC3\", \"AGO2\", \"DDX3X\", \"ATXN2\", \"LSM14A\", \"YBX1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}