{"gene":"DND1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2007,"finding":"DND1 (Dead end 1) binds uridine-rich regions in the 3' UTRs of target mRNAs and physically blocks miRNA access to their target sites, thereby preventing miRNA-mediated repression of those mRNAs. This was demonstrated in human cells and in primordial germ cells of zebrafish.","method":"RNA-binding assays, functional miRNA reporter assays, loss-of-function in zebrafish PGCs","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RNA binding, functional reporter assays, in vivo zebrafish PGC experiments), replicated across cell types and organisms","pmids":["18155131"],"is_preprint":false},{"year":2017,"finding":"DND1 binds a UU(A/U) trinucleotide motif predominantly in the 3' UTRs of mRNAs and destabilizes target mRNAs through direct recruitment of the CCR4-NOT deadenylase complex. The degree of suppression scales with the number of DND1-binding sites. This mRNA destabilization is required for survival of mouse PGCs and spermatogonial stem cells by suppressing pro-apoptotic and pro-inflammatory target mRNAs.","method":"PAR-CLIP/transcriptomic analysis, co-immunoprecipitation of CCR4-NOT complex, loss-of-function mouse genetics with transcriptomic readout","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with CCR4-NOT, PAR-CLIP for motif identification, in vivo genetic validation with transcriptomic readout, multiple orthogonal methods in single study","pmids":["28297718"],"is_preprint":false},{"year":2010,"finding":"DND1 directly binds transcripts encoding the cell cycle inhibitors p27(Kip1) and p21(Cip1), and loss of DND1 (Ter mutation) results in significantly decreased p27 and p21 protein levels in male germ cells, indicating DND1 promotes translational stabilization of these cell cycle regulators to enforce mitotic arrest.","method":"RNA immunoprecipitation (RIP), immunostaining of p27/p21 protein in Dnd1(Ter/Ter) mutant germ cells, genetic mouse models","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP to demonstrate direct binding, protein-level readout in vivo, single lab with two orthogonal methods","pmids":["21115610"],"is_preprint":false},{"year":2008,"finding":"DND1 co-immunoprecipitates APOBEC3 from mammalian cells and from mouse gonads, and the two proteins co-localize to the cytoplasm at peri-nuclear sites when co-expressed. Whether interaction is direct or indirect was not determined.","method":"Co-immunoprecipitation from mammalian cells and mouse gonad lysates; fluorescence co-localization of tagged proteins","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP without confirmation of direct interaction, single lab, no functional mechanistic follow-up for this interaction","pmids":["18509452"],"is_preprint":false},{"year":2011,"finding":"DND1 physically associates with mRNAs encoding pluripotency factors (OCT4, SOX2, NANOG, LIN28), cell cycle regulators (TP53, LATS2), and apoptotic factors (BCLX, BAX) in embryonic stem cells, as shown by ribonucleoprotein immunoprecipitation (RIP).","method":"RIP followed by RT-PCR in HA-tagged DND1-expressing human ES cells","journal":"BMC molecular biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single RIP experiment, single lab, no functional mechanistic follow-up confirming regulatory consequence","pmids":["21851623"],"is_preprint":false},{"year":2012,"finding":"DND1 suppresses miR-26a-mediated inhibition of Ezh2 expression in mouse PGCs, maintaining H3K27me3 levels. Loss of DND1 reduces Ezh2 and H3K27me3, including at the Ccnd1 locus, promoting PGC reprogramming into teratoma-forming cells.","method":"Genetic mouse model (Dnd1 mutant), chromatin immunoprecipitation (H3K27me3), western blot for Ezh2, functional rescue experiments with Ezh2 expression or Ccnd1 deficiency","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP, western blot, functional rescue), single lab","pmids":["29378702"],"is_preprint":false},{"year":2017,"finding":"DND1 binds the 3' UTR of LATS2 mRNA and elevates LATS2 mRNA stability and protein expression, leading to YAP phosphorylation and cytoplasmic retention, thereby activating the Hippo pathway and suppressing EMT and cancer stem cell properties in hepatocellular carcinoma cells.","method":"RNA pull-down/binding assay for LATS2 3'UTR, western blot for YAP phosphorylation, loss-of-function knockdown with phenotypic readout","journal":"Biotechnology letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method for binding (RIP/pull-down not fully described), mechanistic pathway placement partially supported","pmids":["28593479"],"is_preprint":false},{"year":2017,"finding":"DND1 stabilizes Bim mRNA by competing with miR-221 at the miR-221-binding site in the Bim 3' UTR, thereby preventing miR-221-mediated decay of Bim mRNA and promoting apoptosis. Mutation of the miR-221 binding site in Bim 3'UTR abolished the protective effect of DND1.","method":"DND1 knockdown in MCF-7 cells, Bim mRNA stability assays, 3'UTR mutagenesis, miR-221 functional interaction assays","journal":"BioMed research international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis of binding site, mRNA stability assay, knockdown with functional readout, single lab","pmids":["28191469"],"is_preprint":false},{"year":2018,"finding":"CRISPR-mediated base-editing screening identified four missense mutations in DND1 that completely deplete PGCs in mice by disrupting DND1 protein stability and protein-protein interactions, defining specific amino acids critical for DND1 function in vivo.","method":"CRISPR/Cas9 base-editing in mice, in vivo PGC depletion phenotype, protein stability and co-immunoprecipitation assays","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo base-editing with defined PGC phenotype, protein stability and interaction assays, single lab with multiple orthogonal methods","pmids":["30275529"],"is_preprint":false},{"year":2019,"finding":"DND1 controls downregulation of mRNAs associated with pluripotency, active cell cycle (including mTor, Hippo, and Bmp/Nodal signaling elements), and also directly targets and promotes expression of chromatin regulators required for male germ cell differentiation. DO-RIP-Seq identified DND1 direct target mRNAs in mouse male germ cells.","method":"DO-RIP-Seq (direct mRNA target identification), RNA-seq transcriptome analysis in Dnd1 Ter/Ter mutant male germ cells at E12.5–E14.5","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RIP-sequencing for target identification combined with in vivo transcriptomic analysis, single lab with two orthogonal methods","pmids":["31253634"],"is_preprint":false},{"year":2021,"finding":"Crystal structure of the human DND1-RRM2 domain (2.3 Å) revealed a non-canonical RRM fold maintained by a 3D domain-swapped dimer formed between β1 and β4 strands across protomers; NMR spectroscopy and MD simulations provided residue-level dynamics supporting the molecular basis of dimerization.","method":"X-ray crystallography (2.3 Å), NMR spectroscopy, molecular dynamics simulations","journal":"Protein science : a publication of the Protein Society","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure at 2.3 Å with NMR validation, two orthogonal structural methods, single lab","pmids":["33860980"],"is_preprint":false},{"year":2022,"finding":"NANOS2 interacts with RNA-bound DND1 and recruits the CNOT deadenylase complex to target mRNAs for repression. NANOS2 is required not only for CNOT recruitment but also for selecting the target mRNA together with DND1; a NANOS2-NIM–DND1 fusion that bypasses NANOS2's target selection function fails to repress targets, showing NANOS2 acts as a second-layer RBP for DND1 functional adaptation.","method":"Co-immunoprecipitation, somatic cell reporter system for exogenous NANOS2-DND1, domain-fusion constructs, mRNA repression assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, functional domain-fusion experiments, somatic cell system with mechanistic dissection, single lab","pmids":["35705038"],"is_preprint":false},{"year":2023,"finding":"DND1 is essential for the localization of nanos3 RNA to the periphery of zebrafish germ granules (phase-separated condensates), where ribosomes are present. In the absence of Dnd1, nanos3 RNA translocates from the granule periphery to the interior, away from ribosomes, correlating with loss of germ cell fate.","method":"3D in vivo live imaging, loss-of-function (dnd1 morpholino/mutant zebrafish), fluorescent RNA localization assays in germ granules","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vivo imaging with loss-of-function, functional consequence (germ cell fate loss) linked to localization change, single lab","pmids":["37463577"],"is_preprint":false},{"year":2023,"finding":"DND1 RIP-sequencing in male germ cells during G0 cell cycle arrest identified binding targets including DNA methyltransferases (Dnmts), histone deacetylases (Hdacs), Tudor domain proteins (Tdrds), actin-dependent regulators (Smarcs), and ribosomal/Golgi proteins, indicating DND1 coordinates mRNA regulons of functionally related epigenetic enzymes and translational components.","method":"RIP-sequencing using antibodies against DND1-GFP knock-in fusion protein, RNA-seq time course in DND1-GFP-hi and DND1-GFP-lo male germ cell populations","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq with endogenously tagged protein, RNA-seq confirmation, single lab with two orthogonal genomic methods","pmids":["36857387"],"is_preprint":false},{"year":2025,"finding":"DND1 and NANOS3 form a ribonucleoprotein complex that specifically recognizes an AUGAAUU heptanucleotide motif (N3-DRE) in the 3' UTRs of target mRNAs. A 1.7-Å crystal structure of the ternary complex (DND1 + NANOS3 + CDK1-N3-DRE RNA) revealed a continuous RNA-binding surface enabling high-affinity, sequence-specific recognition. In vivo genome editing confirmed the N3-DRE is required for Cdk1 repression in mouse PGCs. DND1 alone has low intrinsic sequence specificity, but together with NANOS3 builds a high-information-content recognition motif.","method":"Tandem PAR-CLIP, 1.7-Å X-ray crystallography of ternary complex, CRISPR/Cas9 genome editing of N3-DRE in mice, loss-of-function transcriptomics","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution crystal structure of ternary complex, PAR-CLIP for motif identification, in vivo genome editing validation, multiple orthogonal methods","pmids":["41040373"],"is_preprint":true},{"year":2025,"finding":"DND1 forms a complex with NANOS3 to restrict human PGC (hPGC) specification. DND1 facilitates NANOS3 binding to hPGCLC-related mRNAs. The DND1-NANOS3 complex acts in processing bodies (P-bodies) to repress translation of SOX4 mRNA, with NANOS3 mediating interaction between DND1 and the translational repressor 4E-T.","method":"Co-immunoprecipitation, mRNA-binding analysis (RIP), P-body localization experiments, loss-of-function in human iPSC-derived PGCLCs, 4E-T interaction assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for complex formation, mRNA target identification, P-body localization with functional consequence, single lab with multiple orthogonal methods","pmids":["40410171"],"is_preprint":false},{"year":2024,"finding":"DND1 protein binds CLIC4 mRNA and promotes its degradation (negative correlation between DND1 and CLIC4 expression); silencing DND1 increases CLIC4 levels and suppresses proliferation, migration, invasion, and EMT in prostate cancer cells.","method":"Bioinformatic target prediction, western blot and qRT-PCR for CLIC4 expression, DND1 knockdown with functional rescue assays","journal":"Histology and histopathology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — binding inferred from bioinformatics and expression correlation, no direct biochemical binding assay for CLIC4 mRNA, single lab","pmids":["38390782"],"is_preprint":false},{"year":2015,"finding":"DND1 stabilizes p21(CIP1) mRNA in acute promyelocytic leukemia (APL/NB4) cells; knockdown of DND1 decreases p21(CIP1) mRNA expression and attenuates neutrophil differentiation, indicating DND1 is required for p21-mediated cell cycle arrest during granulocytic differentiation.","method":"Stable DND1 knockdown cell lines, qRT-PCR for p21 mRNA, differentiation assays in NB4 cells","journal":"Leukemia research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — knockdown with mRNA-level readout, no direct binding assay for p21 mRNA in this study, single lab","pmids":["26740055"],"is_preprint":false}],"current_model":"DND1 is a vertebrate-conserved RNA-binding protein that binds UU(A/U)-rich motifs in mRNA 3' UTRs; it can either protect bound mRNAs from miRNA-mediated repression by physically blocking miRNA access, or destabilize target mRNAs by recruiting the CCR4-NOT deadenylase complex. Together with NANOS2 or NANOS3, DND1 forms higher-order ribonucleoprotein complexes—with a defined 1.7-Å ternary structure showing that DND1-NANOS3 jointly recognize an AUGAAUU heptanucleotide (N3-DRE) in target 3' UTRs—to repress key cell-cycle and epigenome regulators (e.g., CDK1) in primordial germ cells; DND1 also localizes nanos3 RNA to the translating periphery of phase-separated germ granules, and its second RRM domain forms a domain-swapped dimer whose structure has been solved at 2.3 Å."},"narrative":{"mechanistic_narrative":"DND1 is a vertebrate-conserved RNA-binding protein that controls the fate and survival of primordial germ cells (PGCs) by binding uridine-rich and structured motifs in target mRNA 3' UTRs and exerting opposing post-transcriptional outcomes [PMID:18155131, PMID:28297718]. In its protective mode, DND1 binds U-rich 3' UTR regions and physically occludes miRNA access to their target sites, shielding bound mRNAs from miRNA-mediated repression [PMID:18155131]. In its destabilizing mode, DND1 recognizes a UU(A/U) motif and recruits the CCR4-NOT (CNOT) deadenylase complex to promote decay of pro-apoptotic and pro-inflammatory mRNAs, an activity essential for the survival of mouse PGCs and spermatogonial stem cells [PMID:28297718]. Target selection and high-affinity recognition are conferred by partner Nanos proteins: NANOS2 binds RNA-bound DND1 and is required both for CNOT recruitment and for joint target selection [PMID:35705038], while DND1 together with NANOS3 builds a high-information-content recognition surface that specifically reads an AUGAAUU heptanucleotide (N3-DRE), resolved at atomic resolution in a ternary complex with CDK1 3' UTR RNA and shown by in vivo editing to be required for Cdk1 repression in PGCs [PMID:41040373]. Through these activities DND1 coordinates regulons of cell-cycle regulators and epigenetic enzymes—stabilizing p27/p21 to enforce mitotic arrest [PMID:21115610] and maintaining Ezh2/H3K27me3 to prevent teratoma-forming reprogramming [PMID:29378702]. DND1 also localizes nanos3 RNA to the ribosome-rich periphery of phase-separated germ granules, an activity required for germ cell fate [PMID:37463577], and its RRM2 domain adopts a non-canonical fold stabilized by 3D domain swapping [PMID:33860980].","teleology":[{"year":2007,"claim":"Established the first molecular activity for DND1: that it acts as an mRNA-protective factor by blocking miRNA access rather than as a generic RNA chaperone.","evidence":"RNA-binding and miRNA reporter assays in human cells plus loss-of-function in zebrafish PGCs","pmids":["18155131"],"confidence":"High","gaps":["Did not define the precise binding motif","Did not reconcile protection with later destabilizing activity"]},{"year":2010,"claim":"Connected DND1 RNA binding to cell-cycle control by showing it stabilizes p27/p21 transcripts to enforce germ cell mitotic arrest.","evidence":"RIP and immunostaining of p27/p21 in Dnd1(Ter/Ter) mutant germ cells","pmids":["21115610"],"confidence":"Medium","gaps":["Mechanism of stabilization not defined","Single lab, no biochemical reconstitution"]},{"year":2012,"claim":"Linked DND1 to epigenome maintenance, showing it suppresses miR-26a inhibition of Ezh2 to preserve H3K27me3 and block teratoma-forming reprogramming.","evidence":"Dnd1 mutant mouse, H3K27me3 ChIP, Ezh2 western blot, Ezh2/Ccnd1 rescue","pmids":["29378702"],"confidence":"Medium","gaps":["Direct DND1-Ezh2 mRNA binding not shown in this study","Single lab"]},{"year":2017,"claim":"Resolved the destabilizing arm of DND1 function by defining the UU(A/U) motif and demonstrating direct CCR4-NOT recruitment required for PGC survival.","evidence":"PAR-CLIP, reciprocal Co-IP of CCR4-NOT, loss-of-function mouse genetics with transcriptomics","pmids":["28297718"],"confidence":"High","gaps":["Did not explain how DND1 chooses between protection and decay","Did not resolve structural basis of motif recognition"]},{"year":2017,"claim":"Provided cell-context examples of competitive miRNA blocking and 3' UTR stabilization beyond germline, in cancer cell systems.","evidence":"3'UTR binding/mutagenesis, mRNA stability and knockdown assays in MCF-7 (Bim/miR-221) and HCC (LATS2/Hippo) cells","pmids":["28191469","28593479"],"confidence":"Medium","gaps":["LATS2 binding method incompletely described (Low confidence)","Generalizability to physiological germline targets unclear"]},{"year":2018,"claim":"Identified specific DND1 residues whose mutation abolishes protein stability and protein-protein interactions and depletes PGCs, mapping functional determinants in vivo.","evidence":"CRISPR base-editing in mice, PGC depletion phenotype, protein stability and Co-IP assays","pmids":["30275529"],"confidence":"Medium","gaps":["Did not assign mutated residues to specific structural elements","Single lab"]},{"year":2019,"claim":"Generated a genome-wide direct-target map showing DND1 simultaneously downregulates pluripotency/cell-cycle mRNAs and promotes chromatin-regulator mRNAs for male germ cell differentiation.","evidence":"DO-RIP-Seq and RNA-seq in Dnd1 Ter/Ter male germ cells","pmids":["31253634"],"confidence":"Medium","gaps":["Did not separate direct vs indirect transcriptomic effects mechanistically","Single lab"]},{"year":2021,"claim":"Provided the first atomic view of a DND1 domain, revealing RRM2 is non-canonical and forms a 3D domain-swapped dimer.","evidence":"2.3-Å X-ray crystallography, NMR, MD simulations","pmids":["33860980"],"confidence":"High","gaps":["Functional role of the domain-swapped dimer in RNA binding not established","Did not include full-length protein or RNA"]},{"year":2022,"claim":"Defined NANOS2 as a second-layer adaptor that selects targets with DND1 and recruits CNOT, showing DND1 specificity is partner-dependent.","evidence":"Reciprocal Co-IP, somatic reporter system, NANOS2-NIM-DND1 fusion repression assays","pmids":["35705038"],"confidence":"Medium","gaps":["Structural basis of NANOS2-DND1-RNA recognition not resolved here","Single lab"]},{"year":2023,"claim":"Connected DND1 to germ-granule biology and to regulon-level coordination, localizing nanos3 RNA to the ribosome-rich granule periphery and identifying epigenetic-enzyme target classes.","evidence":"In vivo live imaging in zebrafish; RIP-seq with DND1-GFP knock-in and time-course RNA-seq in mouse male germ cells","pmids":["37463577","36857387"],"confidence":"Medium","gaps":["Mechanism of peripheral RNA localization not defined","Functional consequence of each target regulon not individually validated"]},{"year":2025,"claim":"Resolved how high-affinity sequence specificity arises, showing DND1+NANOS3 jointly read an AUGAAUU N3-DRE motif required for Cdk1 repression, and extended the complex to translational repression in human PGCs.","evidence":"Tandem PAR-CLIP and 1.7-Å ternary crystal structure with in vivo N3-DRE editing (bioRxiv preprint); Co-IP, P-body localization and 4E-T assays in human iPSC-derived PGCLCs","pmids":["41040373","40410171"],"confidence":"High","gaps":["Ternary structure findings from a preprint","How DND1 partitions between CNOT decay, 4E-T translational repression, and miRNA blocking on different targets not unified"]},{"year":null,"claim":"It remains unresolved what determines whether DND1 protects an mRNA from miRNAs, recruits CNOT for decay, or drives 4E-T-mediated translational repression on a given target.","evidence":"No timeline study reconciles the opposing protective and destabilizing/repressive activities mechanistically","pmids":[],"confidence":"Medium","gaps":["Switch between protection and repression undefined","Role of RRM2 domain-swapped dimer in target selection unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,2,9,13,14]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[1,11]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[11,14]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,12,15]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,11,14]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[1,9,12]}],"complexes":["CCR4-NOT (CNOT) deadenylase complex","DND1-NANOS2 RNP","DND1-NANOS3 RNP"],"partners":["NANOS2","NANOS3","CNOT","APOBEC3","EIF4ENIF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IYX4","full_name":"Dead end protein homolog 1","aliases":["RNA-binding motif, single-stranded-interacting protein 4"],"length_aa":353,"mass_kda":38.7,"function":"RNA-binding factor that positively regulates gene expression by prohibiting miRNA-mediated gene suppression. Relieves miRNA repression in germline cells (By similarity). Prohibits the function of several miRNAs by blocking the accessibility of target mRNAs. Sequence-specific RNA-binding factor that binds specifically to U-rich regions (URRs) in the 3' untranslated region (3'-UTR) of several mRNAs. Does not bind to miRNAs. May play a role during primordial germ cell (PGC) survival (By similarity). However, does not seem to be essential for PGC migration (By similarity)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q8IYX4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DND1","classification":"Not Classified","n_dependent_lines":58,"n_total_lines":1208,"dependency_fraction":0.048013245033112585},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DND1","total_profiled":1310},"omim":[{"mim_id":"609385","title":"DND MICRO RNA-MEDIATED REPRESSION INHIBITOR 1; DND1","url":"https://www.omim.org/entry/609385"},{"mim_id":"600778","title":"CYCLIN-DEPENDENT KINASE INHIBITOR 1B; CDKN1B","url":"https://www.omim.org/entry/600778"},{"mim_id":"300568","title":"MICRO RNA 221; MIR221","url":"https://www.omim.org/entry/300568"},{"mim_id":"273300","title":"TESTICULAR GERM CELL TUMOR; TGCT","url":"https://www.omim.org/entry/273300"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Focal adhesion sites","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":3.3},{"tissue":"testis","ntpm":11.6}],"url":"https://www.proteinatlas.org/search/DND1"},"hgnc":{"alias_symbol":["MGC34750","RBMS4"],"prev_symbol":[]},"alphafold":{"accession":"Q8IYX4","domains":[{"cath_id":"3.30.70.330","chopping":"17-134","consensus_level":"high","plddt":91.5875,"start":17,"end":134},{"cath_id":"3.30.70.330","chopping":"140-228","consensus_level":"high","plddt":86.6896,"start":140,"end":228},{"cath_id":"3.30.160.20","chopping":"255-334","consensus_level":"high","plddt":84.6407,"start":255,"end":334}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IYX4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IYX4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IYX4-F1-predicted_aligned_error_v6.png","plddt_mean":79.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DND1","jax_strain_url":"https://www.jax.org/strain/search?query=DND1"},"sequence":{"accession":"Q8IYX4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IYX4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IYX4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IYX4"}},"corpus_meta":[{"pmid":"18155131","id":"PMC_18155131","title":"RNA-binding protein Dnd1 inhibits microRNA access to target mRNA.","date":"2007","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/18155131","citation_count":571,"is_preprint":false},{"pmid":"28297718","id":"PMC_28297718","title":"DND1 maintains germline stem cells via recruitment of the CCR4-NOT complex to target mRNAs.","date":"2017","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/28297718","citation_count":112,"is_preprint":false},{"pmid":"21115610","id":"PMC_21115610","title":"Regulation of male germ cell cycle arrest and differentiation by DND1 is modulated by genetic background.","date":"2010","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/21115610","citation_count":82,"is_preprint":false},{"pmid":"20816961","id":"PMC_20816961","title":"MicroRNA-24 targeting RNA-binding protein DND1 in tongue squamous cell carcinoma.","date":"2010","source":"FEBS 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This was demonstrated in human cells and in primordial germ cells of zebrafish.\",\n      \"method\": \"RNA-binding assays, functional miRNA reporter assays, loss-of-function in zebrafish PGCs\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RNA binding, functional reporter assays, in vivo zebrafish PGC experiments), replicated across cell types and organisms\",\n      \"pmids\": [\"18155131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DND1 binds a UU(A/U) trinucleotide motif predominantly in the 3' UTRs of mRNAs and destabilizes target mRNAs through direct recruitment of the CCR4-NOT deadenylase complex. The degree of suppression scales with the number of DND1-binding sites. This mRNA destabilization is required for survival of mouse PGCs and spermatogonial stem cells by suppressing pro-apoptotic and pro-inflammatory target mRNAs.\",\n      \"method\": \"PAR-CLIP/transcriptomic analysis, co-immunoprecipitation of CCR4-NOT complex, loss-of-function mouse genetics with transcriptomic readout\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with CCR4-NOT, PAR-CLIP for motif identification, in vivo genetic validation with transcriptomic readout, multiple orthogonal methods in single study\",\n      \"pmids\": [\"28297718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DND1 directly binds transcripts encoding the cell cycle inhibitors p27(Kip1) and p21(Cip1), and loss of DND1 (Ter mutation) results in significantly decreased p27 and p21 protein levels in male germ cells, indicating DND1 promotes translational stabilization of these cell cycle regulators to enforce mitotic arrest.\",\n      \"method\": \"RNA immunoprecipitation (RIP), immunostaining of p27/p21 protein in Dnd1(Ter/Ter) mutant germ cells, genetic mouse models\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP to demonstrate direct binding, protein-level readout in vivo, single lab with two orthogonal methods\",\n      \"pmids\": [\"21115610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DND1 co-immunoprecipitates APOBEC3 from mammalian cells and from mouse gonads, and the two proteins co-localize to the cytoplasm at peri-nuclear sites when co-expressed. Whether interaction is direct or indirect was not determined.\",\n      \"method\": \"Co-immunoprecipitation from mammalian cells and mouse gonad lysates; fluorescence co-localization of tagged proteins\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP without confirmation of direct interaction, single lab, no functional mechanistic follow-up for this interaction\",\n      \"pmids\": [\"18509452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DND1 physically associates with mRNAs encoding pluripotency factors (OCT4, SOX2, NANOG, LIN28), cell cycle regulators (TP53, LATS2), and apoptotic factors (BCLX, BAX) in embryonic stem cells, as shown by ribonucleoprotein immunoprecipitation (RIP).\",\n      \"method\": \"RIP followed by RT-PCR in HA-tagged DND1-expressing human ES cells\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single RIP experiment, single lab, no functional mechanistic follow-up confirming regulatory consequence\",\n      \"pmids\": [\"21851623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DND1 suppresses miR-26a-mediated inhibition of Ezh2 expression in mouse PGCs, maintaining H3K27me3 levels. Loss of DND1 reduces Ezh2 and H3K27me3, including at the Ccnd1 locus, promoting PGC reprogramming into teratoma-forming cells.\",\n      \"method\": \"Genetic mouse model (Dnd1 mutant), chromatin immunoprecipitation (H3K27me3), western blot for Ezh2, functional rescue experiments with Ezh2 expression or Ccnd1 deficiency\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP, western blot, functional rescue), single lab\",\n      \"pmids\": [\"29378702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DND1 binds the 3' UTR of LATS2 mRNA and elevates LATS2 mRNA stability and protein expression, leading to YAP phosphorylation and cytoplasmic retention, thereby activating the Hippo pathway and suppressing EMT and cancer stem cell properties in hepatocellular carcinoma cells.\",\n      \"method\": \"RNA pull-down/binding assay for LATS2 3'UTR, western blot for YAP phosphorylation, loss-of-function knockdown with phenotypic readout\",\n      \"journal\": \"Biotechnology letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method for binding (RIP/pull-down not fully described), mechanistic pathway placement partially supported\",\n      \"pmids\": [\"28593479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DND1 stabilizes Bim mRNA by competing with miR-221 at the miR-221-binding site in the Bim 3' UTR, thereby preventing miR-221-mediated decay of Bim mRNA and promoting apoptosis. Mutation of the miR-221 binding site in Bim 3'UTR abolished the protective effect of DND1.\",\n      \"method\": \"DND1 knockdown in MCF-7 cells, Bim mRNA stability assays, 3'UTR mutagenesis, miR-221 functional interaction assays\",\n      \"journal\": \"BioMed research international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis of binding site, mRNA stability assay, knockdown with functional readout, single lab\",\n      \"pmids\": [\"28191469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRISPR-mediated base-editing screening identified four missense mutations in DND1 that completely deplete PGCs in mice by disrupting DND1 protein stability and protein-protein interactions, defining specific amino acids critical for DND1 function in vivo.\",\n      \"method\": \"CRISPR/Cas9 base-editing in mice, in vivo PGC depletion phenotype, protein stability and co-immunoprecipitation assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo base-editing with defined PGC phenotype, protein stability and interaction assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"30275529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DND1 controls downregulation of mRNAs associated with pluripotency, active cell cycle (including mTor, Hippo, and Bmp/Nodal signaling elements), and also directly targets and promotes expression of chromatin regulators required for male germ cell differentiation. DO-RIP-Seq identified DND1 direct target mRNAs in mouse male germ cells.\",\n      \"method\": \"DO-RIP-Seq (direct mRNA target identification), RNA-seq transcriptome analysis in Dnd1 Ter/Ter mutant male germ cells at E12.5–E14.5\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RIP-sequencing for target identification combined with in vivo transcriptomic analysis, single lab with two orthogonal methods\",\n      \"pmids\": [\"31253634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structure of the human DND1-RRM2 domain (2.3 Å) revealed a non-canonical RRM fold maintained by a 3D domain-swapped dimer formed between β1 and β4 strands across protomers; NMR spectroscopy and MD simulations provided residue-level dynamics supporting the molecular basis of dimerization.\",\n      \"method\": \"X-ray crystallography (2.3 Å), NMR spectroscopy, molecular dynamics simulations\",\n      \"journal\": \"Protein science : a publication of the Protein Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure at 2.3 Å with NMR validation, two orthogonal structural methods, single lab\",\n      \"pmids\": [\"33860980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NANOS2 interacts with RNA-bound DND1 and recruits the CNOT deadenylase complex to target mRNAs for repression. NANOS2 is required not only for CNOT recruitment but also for selecting the target mRNA together with DND1; a NANOS2-NIM–DND1 fusion that bypasses NANOS2's target selection function fails to repress targets, showing NANOS2 acts as a second-layer RBP for DND1 functional adaptation.\",\n      \"method\": \"Co-immunoprecipitation, somatic cell reporter system for exogenous NANOS2-DND1, domain-fusion constructs, mRNA repression assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, functional domain-fusion experiments, somatic cell system with mechanistic dissection, single lab\",\n      \"pmids\": [\"35705038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DND1 is essential for the localization of nanos3 RNA to the periphery of zebrafish germ granules (phase-separated condensates), where ribosomes are present. In the absence of Dnd1, nanos3 RNA translocates from the granule periphery to the interior, away from ribosomes, correlating with loss of germ cell fate.\",\n      \"method\": \"3D in vivo live imaging, loss-of-function (dnd1 morpholino/mutant zebrafish), fluorescent RNA localization assays in germ granules\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vivo imaging with loss-of-function, functional consequence (germ cell fate loss) linked to localization change, single lab\",\n      \"pmids\": [\"37463577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DND1 RIP-sequencing in male germ cells during G0 cell cycle arrest identified binding targets including DNA methyltransferases (Dnmts), histone deacetylases (Hdacs), Tudor domain proteins (Tdrds), actin-dependent regulators (Smarcs), and ribosomal/Golgi proteins, indicating DND1 coordinates mRNA regulons of functionally related epigenetic enzymes and translational components.\",\n      \"method\": \"RIP-sequencing using antibodies against DND1-GFP knock-in fusion protein, RNA-seq time course in DND1-GFP-hi and DND1-GFP-lo male germ cell populations\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq with endogenously tagged protein, RNA-seq confirmation, single lab with two orthogonal genomic methods\",\n      \"pmids\": [\"36857387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DND1 and NANOS3 form a ribonucleoprotein complex that specifically recognizes an AUGAAUU heptanucleotide motif (N3-DRE) in the 3' UTRs of target mRNAs. A 1.7-Å crystal structure of the ternary complex (DND1 + NANOS3 + CDK1-N3-DRE RNA) revealed a continuous RNA-binding surface enabling high-affinity, sequence-specific recognition. In vivo genome editing confirmed the N3-DRE is required for Cdk1 repression in mouse PGCs. DND1 alone has low intrinsic sequence specificity, but together with NANOS3 builds a high-information-content recognition motif.\",\n      \"method\": \"Tandem PAR-CLIP, 1.7-Å X-ray crystallography of ternary complex, CRISPR/Cas9 genome editing of N3-DRE in mice, loss-of-function transcriptomics\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution crystal structure of ternary complex, PAR-CLIP for motif identification, in vivo genome editing validation, multiple orthogonal methods\",\n      \"pmids\": [\"41040373\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DND1 forms a complex with NANOS3 to restrict human PGC (hPGC) specification. DND1 facilitates NANOS3 binding to hPGCLC-related mRNAs. The DND1-NANOS3 complex acts in processing bodies (P-bodies) to repress translation of SOX4 mRNA, with NANOS3 mediating interaction between DND1 and the translational repressor 4E-T.\",\n      \"method\": \"Co-immunoprecipitation, mRNA-binding analysis (RIP), P-body localization experiments, loss-of-function in human iPSC-derived PGCLCs, 4E-T interaction assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for complex formation, mRNA target identification, P-body localization with functional consequence, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"40410171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DND1 protein binds CLIC4 mRNA and promotes its degradation (negative correlation between DND1 and CLIC4 expression); silencing DND1 increases CLIC4 levels and suppresses proliferation, migration, invasion, and EMT in prostate cancer cells.\",\n      \"method\": \"Bioinformatic target prediction, western blot and qRT-PCR for CLIC4 expression, DND1 knockdown with functional rescue assays\",\n      \"journal\": \"Histology and histopathology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — binding inferred from bioinformatics and expression correlation, no direct biochemical binding assay for CLIC4 mRNA, single lab\",\n      \"pmids\": [\"38390782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DND1 stabilizes p21(CIP1) mRNA in acute promyelocytic leukemia (APL/NB4) cells; knockdown of DND1 decreases p21(CIP1) mRNA expression and attenuates neutrophil differentiation, indicating DND1 is required for p21-mediated cell cycle arrest during granulocytic differentiation.\",\n      \"method\": \"Stable DND1 knockdown cell lines, qRT-PCR for p21 mRNA, differentiation assays in NB4 cells\",\n      \"journal\": \"Leukemia research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — knockdown with mRNA-level readout, no direct binding assay for p21 mRNA in this study, single lab\",\n      \"pmids\": [\"26740055\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DND1 is a vertebrate-conserved RNA-binding protein that binds UU(A/U)-rich motifs in mRNA 3' UTRs; it can either protect bound mRNAs from miRNA-mediated repression by physically blocking miRNA access, or destabilize target mRNAs by recruiting the CCR4-NOT deadenylase complex. Together with NANOS2 or NANOS3, DND1 forms higher-order ribonucleoprotein complexes—with a defined 1.7-Å ternary structure showing that DND1-NANOS3 jointly recognize an AUGAAUU heptanucleotide (N3-DRE) in target 3' UTRs—to repress key cell-cycle and epigenome regulators (e.g., CDK1) in primordial germ cells; DND1 also localizes nanos3 RNA to the translating periphery of phase-separated germ granules, and its second RRM domain forms a domain-swapped dimer whose structure has been solved at 2.3 Å.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DND1 is a vertebrate-conserved RNA-binding protein that controls the fate and survival of primordial germ cells (PGCs) by binding uridine-rich and structured motifs in target mRNA 3' UTRs and exerting opposing post-transcriptional outcomes [#0, #1]. In its protective mode, DND1 binds U-rich 3' UTR regions and physically occludes miRNA access to their target sites, shielding bound mRNAs from miRNA-mediated repression [#0]. In its destabilizing mode, DND1 recognizes a UU(A/U) motif and recruits the CCR4-NOT (CNOT) deadenylase complex to promote decay of pro-apoptotic and pro-inflammatory mRNAs, an activity essential for the survival of mouse PGCs and spermatogonial stem cells [#1]. Target selection and high-affinity recognition are conferred by partner Nanos proteins: NANOS2 binds RNA-bound DND1 and is required both for CNOT recruitment and for joint target selection [#11], while DND1 together with NANOS3 builds a high-information-content recognition surface that specifically reads an AUGAAUU heptanucleotide (N3-DRE), resolved at atomic resolution in a ternary complex with CDK1 3' UTR RNA and shown by in vivo editing to be required for Cdk1 repression in PGCs [#14]. Through these activities DND1 coordinates regulons of cell-cycle regulators and epigenetic enzymes—stabilizing p27/p21 to enforce mitotic arrest [#2] and maintaining Ezh2/H3K27me3 to prevent teratoma-forming reprogramming [#5]. DND1 also localizes nanos3 RNA to the ribosome-rich periphery of phase-separated germ granules, an activity required for germ cell fate [#12], and its RRM2 domain adopts a non-canonical fold stabilized by 3D domain swapping [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established the first molecular activity for DND1: that it acts as an mRNA-protective factor by blocking miRNA access rather than as a generic RNA chaperone.\",\n      \"evidence\": \"RNA-binding and miRNA reporter assays in human cells plus loss-of-function in zebrafish PGCs\",\n      \"pmids\": [\"18155131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the precise binding motif\", \"Did not reconcile protection with later destabilizing activity\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected DND1 RNA binding to cell-cycle control by showing it stabilizes p27/p21 transcripts to enforce germ cell mitotic arrest.\",\n      \"evidence\": \"RIP and immunostaining of p27/p21 in Dnd1(Ter/Ter) mutant germ cells\",\n      \"pmids\": [\"21115610\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of stabilization not defined\", \"Single lab, no biochemical reconstitution\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked DND1 to epigenome maintenance, showing it suppresses miR-26a inhibition of Ezh2 to preserve H3K27me3 and block teratoma-forming reprogramming.\",\n      \"evidence\": \"Dnd1 mutant mouse, H3K27me3 ChIP, Ezh2 western blot, Ezh2/Ccnd1 rescue\",\n      \"pmids\": [\"29378702\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DND1-Ezh2 mRNA binding not shown in this study\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved the destabilizing arm of DND1 function by defining the UU(A/U) motif and demonstrating direct CCR4-NOT recruitment required for PGC survival.\",\n      \"evidence\": \"PAR-CLIP, reciprocal Co-IP of CCR4-NOT, loss-of-function mouse genetics with transcriptomics\",\n      \"pmids\": [\"28297718\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain how DND1 chooses between protection and decay\", \"Did not resolve structural basis of motif recognition\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided cell-context examples of competitive miRNA blocking and 3' UTR stabilization beyond germline, in cancer cell systems.\",\n      \"evidence\": \"3'UTR binding/mutagenesis, mRNA stability and knockdown assays in MCF-7 (Bim/miR-221) and HCC (LATS2/Hippo) cells\",\n      \"pmids\": [\"28191469\", \"28593479\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"LATS2 binding method incompletely described (Low confidence)\", \"Generalizability to physiological germline targets unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified specific DND1 residues whose mutation abolishes protein stability and protein-protein interactions and depletes PGCs, mapping functional determinants in vivo.\",\n      \"evidence\": \"CRISPR base-editing in mice, PGC depletion phenotype, protein stability and Co-IP assays\",\n      \"pmids\": [\"30275529\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not assign mutated residues to specific structural elements\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Generated a genome-wide direct-target map showing DND1 simultaneously downregulates pluripotency/cell-cycle mRNAs and promotes chromatin-regulator mRNAs for male germ cell differentiation.\",\n      \"evidence\": \"DO-RIP-Seq and RNA-seq in Dnd1 Ter/Ter male germ cells\",\n      \"pmids\": [\"31253634\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not separate direct vs indirect transcriptomic effects mechanistically\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided the first atomic view of a DND1 domain, revealing RRM2 is non-canonical and forms a 3D domain-swapped dimer.\",\n      \"evidence\": \"2.3-Å X-ray crystallography, NMR, MD simulations\",\n      \"pmids\": [\"33860980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of the domain-swapped dimer in RNA binding not established\", \"Did not include full-length protein or RNA\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined NANOS2 as a second-layer adaptor that selects targets with DND1 and recruits CNOT, showing DND1 specificity is partner-dependent.\",\n      \"evidence\": \"Reciprocal Co-IP, somatic reporter system, NANOS2-NIM-DND1 fusion repression assays\",\n      \"pmids\": [\"35705038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of NANOS2-DND1-RNA recognition not resolved here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connected DND1 to germ-granule biology and to regulon-level coordination, localizing nanos3 RNA to the ribosome-rich granule periphery and identifying epigenetic-enzyme target classes.\",\n      \"evidence\": \"In vivo live imaging in zebrafish; RIP-seq with DND1-GFP knock-in and time-course RNA-seq in mouse male germ cells\",\n      \"pmids\": [\"37463577\", \"36857387\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of peripheral RNA localization not defined\", \"Functional consequence of each target regulon not individually validated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Resolved how high-affinity sequence specificity arises, showing DND1+NANOS3 jointly read an AUGAAUU N3-DRE motif required for Cdk1 repression, and extended the complex to translational repression in human PGCs.\",\n      \"evidence\": \"Tandem PAR-CLIP and 1.7-Å ternary crystal structure with in vivo N3-DRE editing (bioRxiv preprint); Co-IP, P-body localization and 4E-T assays in human iPSC-derived PGCLCs\",\n      \"pmids\": [\"41040373\", \"40410171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ternary structure findings from a preprint\", \"How DND1 partitions between CNOT decay, 4E-T translational repression, and miRNA blocking on different targets not unified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved what determines whether DND1 protects an mRNA from miRNAs, recruits CNOT for decay, or drives 4E-T-mediated translational repression on a given target.\",\n      \"evidence\": \"No timeline study reconciles the opposing protective and destabilizing/repressive activities mechanistically\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Switch between protection and repression undefined\", \"Role of RRM2 domain-swapped dimer in target selection unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 2, 9, 13, 14]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [1, 11]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [11, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 12, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 11, 14]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [1, 9, 12]}\n    ],\n    \"complexes\": [\"CCR4-NOT (CNOT) deadenylase complex\", \"DND1-NANOS2 RNP\", \"DND1-NANOS3 RNP\"],\n    \"partners\": [\"NANOS2\", \"NANOS3\", \"CNOT\", \"APOBEC3\", \"EIF4ENIF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}