{"gene":"ZSWIM8","run_date":"2026-06-11T09:02:07","timeline":{"discoveries":[{"year":2020,"finding":"ZSWIM8 is a substrate adaptor of a Cullin-RING E3 ubiquitin ligase (CRL) that interacts with AGO proteins and mediates target-directed miRNA degradation (TDMD) by directing proteasomal decay of miRNA-containing AGO complexes engaged with highly complementary 'trigger' target RNAs, thereby exposing the miRNA for degradation. This mechanism is independent of miRNA tailing and trimming.","method":"CRISPR/Cas9 loss-of-function, co-immunoprecipitation of ZSWIM8 CRL with AGO proteins, small RNA sequencing in loss-of-function cells, genetic rescue experiments in mammals, flies, and nematodes","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent simultaneous publications using reciprocal Co-IP, genetic KO, and small-RNA sequencing across multiple organisms; independently replicated across labs (Shi et al. PMID:33184237 and Han et al. PMID:33184234)","pmids":["33184237","33184234"],"is_preprint":false},{"year":2020,"finding":"ZSWIM8 CRL-mediated AGO polyubiquitination and proteasomal degradation is the key regulatory step of TDMD; the ZSWIM8 CRL specifically recognizes AGO complexes only when the miRNA is extensively paired to a trigger RNA, not when engaged with typical target RNAs.","method":"Biochemical in vitro ubiquitylation assays, cryo-EM structural analysis of AGO2-miRNA-trigger complex bound to ZSWIM8, cellular ubiquitination assays with mutational analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure combined with in vitro reconstitution of AGO polyubiquitylation and cellular assays, published in peer-reviewed journal (PMID:41851464), consistent with and extending prior biochemical findings","pmids":["41851464"],"is_preprint":false},{"year":2026,"finding":"Cryo-EM analyses revealed that ZSWIM8 recognizes distinct AGO2 conformational states induced by miRNA-trigger pairing: the trigger RNA extracts the miRNA from a binding pocket within AGO2, allowing the pocket to be captured by ZSWIM8, and the trigger RNA itself follows a distinct trajectory also recognized by ZSWIM8. This establishes a 'two-RNA-factor authentication' mechanism for specifying AGO ubiquitylation that does not conform to a conventional degron.","method":"Cryo-EM structural determination, in vitro biochemical ubiquitylation reconstitution, active-site mutagenesis, cellular assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure with biochemical reconstitution and mutagenesis in a single rigorous study (PMID:41851464); preprint version also available (PMID:41542392)","pmids":["41851464","41542392"],"is_preprint":false},{"year":2023,"finding":"Conditional deletion of Zswim8 in the mouse embryonic nervous system causes global cellular stress, partial perinatal lethality, defective migration of neural progenitor cells, and impaired spine formation and synaptogenesis. Mechanistically, ZSWIM8 controls protein quality of Disabled 1 (Dab1) by recognizing intrinsically disordered regions (IDRs) of Dab1 through a 'disorder targets misorder' mechanism, eliminating misfolded Dab1 that cannot be properly phosphorylated.","method":"Conditional CRISPR knockout in mouse nervous system, Co-IP/pulldown for ZSWIM8-Dab1 interaction, ubiquitination assays, hippocampal neuron spine/synapse imaging","journal":"Cerebral cortex (New York, N.Y. : 1991)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined cellular phenotypes plus Co-IP and ubiquitination assays; single lab, two orthogonal methods","pmids":["35989311"],"is_preprint":false},{"year":2023,"finding":"Constitutive Zswim8 knockout mice die perinatally with lung sacculation defects (failed alveolar epithelial maturation) and ventricular septal defects. Loss of ZSWIM8 results in aberrant accumulation of >50 miRNAs across 12 tissues, demonstrating that ZSWIM8 specifies the half-lives of most short-lived miRNAs in mice. ZSWIM8-sensitive miRNAs are preferentially produced from genomic miRNA clusters, and ZSWIM8 can cause strand/isoform switching from a miRNA hairpin.","method":"Constitutive Zswim8 knockout mouse generation, small RNA sequencing across 12 tissues, mRNA target repression analysis","journal":"Genome research","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular and molecular phenotypes replicated independently (PMID:37532519 and PMID:37553261)","pmids":["37532519","37553261"],"is_preprint":false},{"year":2023,"finding":"Deletion of miR-322 and miR-503 rescued embryonic growth restriction in Zswim8-null mice, directly establishing that TDMD-mediated degradation of these specific miRNAs by ZSWIM8 is required for normal mammalian body size.","method":"Genetic epistasis in mice — double KO (Zswim8-null × miR-322/503-null) with embryonic growth measurements","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis via double mutant rescue in vivo, independently replicated by two labs (PMID:37553261 and PMID:41213800)","pmids":["37553261","41213800"],"is_preprint":false},{"year":2024,"finding":"ZSWIM8, as the substrate receptor of the Cullin3-RING E3 ligase complex, is required for Zika virus NS5-mediated degradation of STAT2. NS5 acts as a scaffold that enhances the interaction between STAT2 and the ZSWIM8-CUL3 complex, facilitating STAT2 ubiquitination and proteasomal degradation, thereby suppressing type I interferon signaling.","method":"Genome-wide CRISPR/Cas9 screen, genetic depletion of ZSWIM8 and CUL3, biochemical Co-IP showing NS5 bridges STAT2 and ZSWIM8-CUL3, ubiquitination assays, ZSWIM8 KO in A549/Huh7 and human neural progenitor cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide unbiased screen identifying ZSWIM8, confirmed by Co-IP, ubiquitination assay, and functional KO phenotype; multiple orthogonal methods in one study","pmids":["39145933"],"is_preprint":false},{"year":2022,"finding":"The Drosophila ZSWIM8 ortholog Pelado/CG34401 promotes linear actin filament polymerization at the expense of branched filaments. Loss of Pelado causes actin hair elongation defects in epithelial cells and loss of filopodia in hemocytes. This function is conserved in human cells, where ZSWIM8 knockdown inhibits cell migration by affecting branched actin polymerization.","method":"Drosophila pelado mutant analysis, genetic epistasis with actin regulators (linear vs. branched polymerization), human cell ZSWIM8 knockdown with migration assay and actin cytoskeleton imaging","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in Drosophila combined with human cell KD with defined phenotypic readout; single lab, two orthogonal approaches","pmids":["35940847"],"is_preprint":false},{"year":2021,"finding":"ZSWIM8 is induced during C2C12 myoblast differentiation and is incorporated into the Cdon/JLP/Bnip-2/CDC42 complex. ZSWIM8 knockdown accelerates C2C12 differentiation, indicating that ZSWIM8 partly prevents myogenic differentiation. However, ZSWIM8-dependent ubiquitination or degradation of Bnip2, Cdon, or JLP was not detected.","method":"Co-immunoprecipitation of ZSWIM8 with Cdon complex components, siRNA knockdown of Zswim8 in C2C12 cells with differentiation assay, ubiquitination assay (negative for Bnip2/Cdon/JLP as substrates)","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP demonstrating complex membership and KD with cellular phenotype; single lab; substrate ubiquitination was negative for tested Cdon complex proteins","pmids":["34686700"],"is_preprint":false},{"year":2021,"finding":"In Drosophila, siRNAs loaded into Ago2 are insensitive to Dora (ZSWIM8 ortholog)-mediated target-directed degradation. This protection is conferred by features of the Ago2 protein itself, not by 2'-O-methylation of the small RNA 3' termini. In contrast, the same siRNAs are sensitive to Dora when loaded into Ago1.","method":"Genetic Dora loss-of-function in Drosophila, small RNA sequencing comparing Ago1- vs. Ago2-loaded siRNAs, 2'-O-methylation analysis","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO combined with small RNA sequencing and biochemical analysis; single lab, two orthogonal methods","pmids":["33853897"],"is_preprint":false},{"year":2023,"finding":"In Drosophila S2 cells, the ZSWIM8 ortholog Dora is required for TDMD; AGO1-CLASH identified five TDMD trigger sequences, including a trigger in the 3' UTR of AGO1 mRNA itself that induces miR-999 degradation. Knockout of the AGO1 trigger in S2 cells and in Drosophila specifically elevated miR-999 with concurrent repression of miR-999 targets.","method":"AGO1-CLASH in Dora CRISPR KO Drosophila S2 cells, CRISPR-Cas9 knockout of the AGO1 3' UTR trigger site in S2 cells and in vivo, miRNA/mRNA sequencing","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — CLASH-based direct miRNA-target detection combined with in vivo CRISPR deletion and functional readout, multiple orthogonal methods","pmids":["37055443"],"is_preprint":false},{"year":2024,"finding":"In C. elegans, EBAX-1 (the ZSWIM8 ortholog) polyubiquitinates AGO, leading to its degradation and exposure of the miRNA to cellular nucleases; 22 miRNAs are sensitive to EBAX-1 loss, with the greatest effect in L1 larvae. The 3' region of a miRNA influences EBAX-1 sensitivity in a variable manner.","method":"ebax-1 mutant small RNA sequencing at multiple developmental stages, mRNA target repression analysis, miRNA 3' region replacement experiments","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with small RNA sequencing and mutant miRNA chimera experiments; single lab, multiple orthogonal methods","pmids":["39433399"],"is_preprint":false},{"year":2025,"finding":"In Drosophila ovarian somatic cells, Dora (ZSWIM8 ortholog) associates with CRL3 complex proteins (Cul3, EloB, EloC), and depletion of CRL3 components or inhibition of Cul3 neddylation (via UbcE2M) upregulates miR-7-5p. Dora localizes to protein granules distinct from P-bodies and GW-bodies. Loss of Dora impairs Notch signaling pathway activity.","method":"Co-immunoprecipitation of Dora with CRL3 components, dora CRISPR KO with miRNA sequencing, CRL3 component RNAi, neddylation inhibition, fluorescence localization of tagged Dora","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating CRL3 association combined with genetic KO and pharmacological inhibition; single lab, multiple orthogonal methods","pmids":["40328417"],"is_preprint":false},{"year":2026,"finding":"ZSWIM8 is indispensable for oligodendrocyte maturation and myelination. Loss of ZSWIM8 in brain causes accumulation of IDR-rich proteins including RNA-binding proteins; AGO2 stabilization in ZSWIM8-null tissues disrupts TDMD of miR-7, leading to altered gene expression and myelination defects in vivo. ZSWIM8-mediated ubiquitination of AGO2 also requires microRNA binding to AGO2.","method":"Conditional ZSWIM8 KO in mouse brain, proteomic analysis of IDR protein accumulation, AGO2 ubiquitination assays, miRNA sequencing, myelination phenotype histology","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined cellular phenotype, ubiquitination assay, and miRNA sequencing; single lab, multiple orthogonal methods","pmids":["41787678"],"is_preprint":false},{"year":2026,"finding":"In C. elegans, EBAX-1/ZSWIM8 promotes linker cell-type death (LCD) non-apoptotically and cell-autonomously through TDMD. EBAX-1 requires its Cullin-2 binding motif for LCD. Loss of mir-35 family miRNAs, argonautes, or miRNA biogenesis factors restores LCD to ebax-1 mutants. The predicted miR-35 target viln-1/villin mRNA is upregulated in dying cells and required for LCD.","method":"Genetic epistasis (ebax-1 mutant × argonaute/mir-35/biogenesis factor mutants), cell-autonomous rescue, mRNA expression analysis of viln-1, LCD quantitation","journal":"bioRxiv : the preprint server for biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple double-mutant combinations establishing pathway position; preprint, single lab","pmids":["41542532"],"is_preprint":true},{"year":2024,"finding":"In Pristionchus pacificus, EBAX-1/ZSWIM8 destabilizes the clustered miRNA family miR-2235a/miR-35, and this is required for transgenerational epigenetic memory of the predatory mouth form after dietary switching. Ppa-ebax-1 mutants show no transgenerational memory; deletion of a cluster of 44 miR-2235a copies results in precocious and extended transgenerational inheritance.","method":"ebax-1 mutant analysis, miRNA cluster deletion, dietary induction and food-reversal experiments across multiple generations, miRNA sequencing","journal":"bioRxiv : the preprint server for biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genetic KO and deletion in a non-standard model organism (Pristionchus), single lab, preprint only","pmids":["bio_10.1101_2024.09.10.612280"],"is_preprint":true}],"current_model":"ZSWIM8 functions as the substrate-receptor subunit of a Cullin3-RING E3 ubiquitin ligase complex that recognizes AGO proteins engaged in extensive base-pairing with specialized 'trigger' RNAs; cryo-EM and biochemical studies show that this pairing induces conformational changes in AGO (extracting the miRNA from its binding pocket) that are recognized by ZSWIM8 through RNA-RNA, RNA-protein, and protein-protein contacts, triggering AGO polyubiquitylation, proteasomal degradation, and subsequent miRNA decay (target-directed miRNA degradation, TDMD); this pathway controls the half-lives of most short-lived miRNAs across bilaterian animals and is required for normal mammalian development (cardiac, pulmonary, neural, and growth), and ZSWIM8 can also ubiquitinate other IDR-containing substrates (e.g., Dab1) for protein quality control, while additionally serving as a hijackable substrate receptor enabling viral proteins (e.g., ZIKV NS5) to redirect the complex toward non-miRNA substrates such as STAT2."},"narrative":{"mechanistic_narrative":"ZSWIM8 is the substrate-receptor subunit of a Cullin-RING E3 ubiquitin ligase that controls miRNA stability by executing target-directed miRNA degradation (TDMD), a pathway conserved across bilaterian animals [PMID:33184237, PMID:33184234, PMID:37532519, PMID:37553261]. It recognizes Argonaute (AGO) complexes specifically when the loaded miRNA is extensively base-paired to a highly complementary 'trigger' RNA, polyubiquitinates AGO, and routes it for proteasomal degradation, thereby exposing the miRNA to nucleolytic decay in a manner independent of miRNA tailing and trimming [PMID:33184237, PMID:33184234, PMID:41851464, PMID:39433399]. Cryo-EM and in vitro reconstitution show that trigger pairing extracts the miRNA from a binding pocket in AGO2 and that ZSWIM8 reads out both the exposed pocket and the distinct trajectory of the trigger RNA — a 'two-RNA-factor authentication' mechanism that specifies ubiquitylation without a conventional degron [PMID:41851464, PMID:41542392]. Through this activity ZSWIM8 sets the half-lives of most short-lived miRNAs in mammals, and its loss causes perinatal lethality with lung sacculation and ventricular septal defects, while genetic removal of the miR-322/miR-503 cluster rescues the embryonic growth restriction of Zswim8-null mice, establishing TDMD of specific miRNAs as a developmental requirement [PMID:37532519, PMID:37553261, PMID:41213800]. The complex assembles with CRL3 components (Cul3, EloB, EloC) in invertebrate cells, and in C. elegans EBAX-1 requires a Cullin-2 binding motif for one of its activities, indicating context-dependent cullin usage [PMID:40328417, PMID:41542532]. Beyond miRNA control, ZSWIM8 performs protein quality control on intrinsically disordered substrates: it eliminates misfolded Disabled-1 (Dab1) via a 'disorder targets misorder' mechanism in the developing nervous system [PMID:35989311], and it can be hijacked by Zika virus NS5, which scaffolds STAT2 onto the ZSWIM8-CUL3 complex to drive STAT2 degradation and suppress type I interferon signaling [PMID:39145933]. ZSWIM8/TDMD also shapes oligodendrocyte myelination, neural progenitor migration and synaptogenesis, and developmental cell-fate decisions including non-apoptotic linker-cell death in C. elegans [PMID:35989311, PMID:41787678, PMID:41542532].","teleology":[{"year":2020,"claim":"Established the core function: how are mature miRNAs actively degraded when engaged by highly complementary targets, answered by identifying ZSWIM8 as a CRL substrate adaptor that destroys AGO to expose the miRNA.","evidence":"CRISPR loss-of-function, reciprocal Co-IP of ZSWIM8-CRL with AGO, and small-RNA sequencing across mammals, flies, and nematodes","pmids":["33184237","33184234"],"confidence":"High","gaps":["Did not resolve how the complex structurally distinguishes trigger-paired AGO from canonical targets","Did not identify the full repertoire of affected miRNAs in vivo"]},{"year":2020,"claim":"Defined the rate-limiting step and substrate specificity: AGO polyubiquitination and proteasomal degradation is the key regulatory event, and the complex only recognizes extensively trigger-paired AGO.","evidence":"In vitro ubiquitylation reconstitution, cellular ubiquitination assays with mutagenesis, and cryo-EM of the AGO2-miRNA-trigger-ZSWIM8 complex","pmids":["41851464"],"confidence":"High","gaps":["Atomic basis of conformational recognition not fully resolved here","E2 enzyme partners and ubiquitin chain topology not detailed"]},{"year":2026,"claim":"Resolved the recognition logic: how is ubiquitylation specified absent a linear degron, answered by a two-RNA-factor authentication mechanism in which trigger pairing extracts the miRNA and ZSWIM8 reads both the exposed AGO2 pocket and the trigger RNA path.","evidence":"Cryo-EM structural determination with in vitro reconstitution, active-site mutagenesis, and cellular assays (preprint and journal versions)","pmids":["41851464","41542392"],"confidence":"High","gaps":["Whether all triggers engage identical contacts is untested","Kinetics of conformational capture versus dissociation not quantified"]},{"year":2023,"claim":"Demonstrated the physiological scope in mammals: ZSWIM8 specifies the half-lives of most short-lived miRNAs and is required for cardiac and pulmonary development.","evidence":"Constitutive Zswim8 knockout mouse with small-RNA sequencing across 12 tissues and mRNA target analysis","pmids":["37532519","37553261"],"confidence":"High","gaps":["The triggers for most affected miRNAs were not identified","Tissue-specific trigger sources not mapped"]},{"year":2023,"claim":"Provided causal proof that a defined developmental phenotype results from failed degradation of specific miRNAs, by rescuing growth restriction through miR-322/miR-503 deletion.","evidence":"Mouse genetic epistasis with double knockout (Zswim8-null x miR-322/503-null) and embryonic growth measurement","pmids":["37553261","41213800"],"confidence":"High","gaps":["Other ZSWIM8 phenotypes (cardiac, pulmonary) not attributed to specific miRNAs","Trigger RNA for miR-322/503 not defined in this work"]},{"year":2023,"claim":"Broadened ZSWIM8 function beyond miRNAs to protein quality control, showing it eliminates misfolded Dab1 via recognition of intrinsically disordered regions, with neurodevelopmental consequences.","evidence":"Conditional CRISPR knockout in mouse nervous system, Co-IP, ubiquitination assays, and neuronal spine/synapse imaging","pmids":["35989311"],"confidence":"Medium","gaps":["Single lab; generality of the 'disorder targets misorder' rule across substrates untested","Relative contribution of TDMD versus Dab1 quality control to the neural phenotype unresolved"]},{"year":2026,"claim":"Extended ZSWIM8's role to glial development, linking AGO2 stabilization and disrupted miR-7 TDMD plus IDR-protein accumulation to myelination defects.","evidence":"Conditional ZSWIM8 brain knockout with proteomics, AGO2 ubiquitination assays, miRNA sequencing, and myelination histology","pmids":["41787678"],"confidence":"Medium","gaps":["Single lab; which IDR-protein substrates drive the phenotype not pinned down","Causal separation of TDMD versus protein-quality-control contributions incomplete"]},{"year":2024,"claim":"Revealed ZSWIM8 as a hijackable substrate receptor: Zika virus NS5 scaffolds STAT2 onto ZSWIM8-CUL3 to drive its degradation and dampen interferon signaling.","evidence":"Genome-wide CRISPR screen, ZSWIM8/CUL3 depletion, bridging Co-IP, and ubiquitination assays in A549/Huh7 and neural progenitor cells","pmids":["39145933"],"confidence":"High","gaps":["Whether other viral or endogenous adaptors redirect ZSWIM8 similarly is unknown","Structural basis of NS5-mediated bridging not determined"]},{"year":2021,"claim":"Addressed substrate determinants by showing AGO protein identity, not small-RNA modification, governs TDMD sensitivity in Drosophila.","evidence":"Dora loss-of-function with small-RNA sequencing comparing Ago1- versus Ago2-loaded siRNAs and 2'-O-methylation analysis","pmids":["33853897"],"confidence":"Medium","gaps":["The AGO2 features conferring protection were not mapped","Single-organism observation"]},{"year":2023,"claim":"Identified endogenous triggers and an autoregulatory loop, showing the AGO1 3'UTR itself encodes a trigger that drives miR-999 degradation in flies.","evidence":"AGO1-CLASH in Dora-KO S2 cells with in vivo CRISPR deletion of the trigger site and miRNA/mRNA sequencing","pmids":["37055443"],"confidence":"High","gaps":["Conservation of the AGO1-encoded trigger to mammals untested","Functional consequence of the autoregulatory loop on AGO homeostasis unclear"]},{"year":2024,"claim":"Confirmed conservation of the degradation mechanism in C. elegans, where EBAX-1 polyubiquitinates AGO to expose miRNAs to nucleases with developmental-stage specificity.","evidence":"ebax-1 mutant small-RNA sequencing across stages and miRNA 3'-region replacement experiments","pmids":["39433399"],"confidence":"Medium","gaps":["The nucleases degrading exposed miRNAs not identified","Variable role of the miRNA 3' region not mechanistically explained"]},{"year":2025,"claim":"Clarified cullin and granule context in flies, associating Dora with CRL3 (Cul3/EloB/EloC) and localizing it to distinct protein granules, with loss impairing Notch signaling.","evidence":"Co-IP with CRL3 components, dora KO with miRNA sequencing, CRL3 RNAi, neddylation inhibition, and fluorescence localization","pmids":["40328417"],"confidence":"Medium","gaps":["Composition and function of the Dora granules undefined","Direct miRNA connecting Dora loss to Notch defects not established"]},{"year":2026,"claim":"Linked ZSWIM8/EBAX-1 to a developmental cell-death program, showing it drives non-apoptotic linker-cell death cell-autonomously via TDMD of miR-35 family miRNAs.","evidence":"Genetic epistasis of ebax-1 with argonaute/mir-35/biogenesis mutants, cell-autonomous rescue, and viln-1 expression analysis (preprint)","pmids":["41542532"],"confidence":"Medium","gaps":["Preprint, single lab","The trigger RNA inducing miR-35 degradation in dying cells not identified"]},{"year":null,"claim":"It remains unresolved which RNA features universally define a competent trigger across species and how the same complex partitions its activity between miRNA degradation and IDR-protein quality control in a given cell.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No general predictive rule for trigger RNA competence","No systematic catalog of non-AGO IDR substrates","Determinants selecting Cul3 versus Cul2 partners across contexts unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,3,6,11]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,6,12]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1,2]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[12]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[12]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,4,11]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,3,6]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,5,13]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6]}],"complexes":["Cullin3-RING E3 ubiquitin ligase (CRL3)","Cdon/JLP/Bnip-2/CDC42 complex"],"partners":["AGO2","CUL3","ELOB","ELOC","DAB1","STAT2","CDON"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"A7E2V4","full_name":"Zinc finger SWIM domain-containing protein 8","aliases":[],"length_aa":1837,"mass_kda":197.3,"function":"Substrate recognition component of a SCF-like E3 ubiquitin-protein ligase complex that promotes target-directed microRNA degradation (TDMD), a process that mediates degradation of microRNAs (miRNAs) (PubMed:33184234, PubMed:33184237). The SCF-like E3 ubiquitin-protein ligase complex acts by catalyzing ubiquitination and subsequent degradation of AGO proteins (AGO1, AGO2, AGO3 and/or AGO4), thereby exposing miRNAs for degradation (PubMed:33184234, PubMed:33184237). Specifically recognizes and binds AGO proteins when they are engaged with a TDMD target (PubMed:33184234). May also act as a regulator of axon guidance: specifically recognizes misfolded ROBO3 and promotes its ubiquitination and subsequent degradation (PubMed:24012004). Plays an essential role for proper embryonic development of heart and lung (By similarity). Controls protein quality of DAB1, a key signal molecule for brain development, thus protecting its signaling strength. Mechanistically, recognizes intrinsically disordered regions of DAB1 and eliminates misfolded DAB1 that cannot be properly phosphorylated (By similarity) (Microbial infection) Participates in Zika virus inhibition of IFN signaling by acting as a scaffold protein to connect ZSWIM8/CUL3 ligase complex and STAT2, leading to STAT2 degradation","subcellular_location":"Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/A7E2V4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZSWIM8","classification":"Not Classified","n_dependent_lines":72,"n_total_lines":1208,"dependency_fraction":0.059602649006622516},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ZSWIM8","total_profiled":1310},"omim":[{"mim_id":"619213","title":"ZINC FINGER SWIM DOMAIN-CONTAINING PROTEIN 8; ZSWIM8","url":"https://www.omim.org/entry/619213"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ZSWIM8"},"hgnc":{"alias_symbol":["4832404P21Rik"],"prev_symbol":["KIAA0913"]},"alphafold":{"accession":"A7E2V4","domains":[{"cath_id":"-","chopping":"77-228","consensus_level":"high","plddt":88.2821,"start":77,"end":228},{"cath_id":"-","chopping":"331-394_407-498_760-774","consensus_level":"high","plddt":83.5066,"start":331,"end":774},{"cath_id":"1.25.40","chopping":"1275-1409","consensus_level":"medium","plddt":88.9444,"start":1275,"end":1409},{"cath_id":"1.25.40","chopping":"1691-1835","consensus_level":"high","plddt":83.2882,"start":1691,"end":1835}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/A7E2V4","model_url":"https://alphafold.ebi.ac.uk/files/AF-A7E2V4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-A7E2V4-F1-predicted_aligned_error_v6.png","plddt_mean":61.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZSWIM8","jax_strain_url":"https://www.jax.org/strain/search?query=ZSWIM8"},"sequence":{"accession":"A7E2V4","fasta_url":"https://rest.uniprot.org/uniprotkb/A7E2V4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/A7E2V4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/A7E2V4"}},"corpus_meta":[{"pmid":"33184237","id":"PMC_33184237","title":"The ZSWIM8 ubiquitin ligase mediates target-directed microRNA degradation.","date":"2020","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/33184237","citation_count":187,"is_preprint":false},{"pmid":"33184234","id":"PMC_33184234","title":"A ubiquitin ligase mediates target-directed microRNA decay independently of tailing and trimming.","date":"2020","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/33184234","citation_count":182,"is_preprint":false},{"pmid":"35811249","id":"PMC_35811249","title":"MicroRNA turnover: a tale of tailing, trimming, and targets.","date":"2022","source":"Trends in biochemical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/35811249","citation_count":59,"is_preprint":false},{"pmid":"38224449","id":"PMC_38224449","title":"To kill a microRNA: emerging concepts in target-directed microRNA degradation.","date":"2024","source":"Nucleic acids 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This mechanism is independent of miRNA tailing and trimming.\",\n      \"method\": \"CRISPR/Cas9 loss-of-function, co-immunoprecipitation of ZSWIM8 CRL with AGO proteins, small RNA sequencing in loss-of-function cells, genetic rescue experiments in mammals, flies, and nematodes\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent simultaneous publications using reciprocal Co-IP, genetic KO, and small-RNA sequencing across multiple organisms; independently replicated across labs (Shi et al. PMID:33184237 and Han et al. PMID:33184234)\",\n      \"pmids\": [\"33184237\", \"33184234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ZSWIM8 CRL-mediated AGO polyubiquitination and proteasomal degradation is the key regulatory step of TDMD; the ZSWIM8 CRL specifically recognizes AGO complexes only when the miRNA is extensively paired to a trigger RNA, not when engaged with typical target RNAs.\",\n      \"method\": \"Biochemical in vitro ubiquitylation assays, cryo-EM structural analysis of AGO2-miRNA-trigger complex bound to ZSWIM8, cellular ubiquitination assays with mutational analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure combined with in vitro reconstitution of AGO polyubiquitylation and cellular assays, published in peer-reviewed journal (PMID:41851464), consistent with and extending prior biochemical findings\",\n      \"pmids\": [\"41851464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Cryo-EM analyses revealed that ZSWIM8 recognizes distinct AGO2 conformational states induced by miRNA-trigger pairing: the trigger RNA extracts the miRNA from a binding pocket within AGO2, allowing the pocket to be captured by ZSWIM8, and the trigger RNA itself follows a distinct trajectory also recognized by ZSWIM8. This establishes a 'two-RNA-factor authentication' mechanism for specifying AGO ubiquitylation that does not conform to a conventional degron.\",\n      \"method\": \"Cryo-EM structural determination, in vitro biochemical ubiquitylation reconstitution, active-site mutagenesis, cellular assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure with biochemical reconstitution and mutagenesis in a single rigorous study (PMID:41851464); preprint version also available (PMID:41542392)\",\n      \"pmids\": [\"41851464\", \"41542392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Conditional deletion of Zswim8 in the mouse embryonic nervous system causes global cellular stress, partial perinatal lethality, defective migration of neural progenitor cells, and impaired spine formation and synaptogenesis. Mechanistically, ZSWIM8 controls protein quality of Disabled 1 (Dab1) by recognizing intrinsically disordered regions (IDRs) of Dab1 through a 'disorder targets misorder' mechanism, eliminating misfolded Dab1 that cannot be properly phosphorylated.\",\n      \"method\": \"Conditional CRISPR knockout in mouse nervous system, Co-IP/pulldown for ZSWIM8-Dab1 interaction, ubiquitination assays, hippocampal neuron spine/synapse imaging\",\n      \"journal\": \"Cerebral cortex (New York, N.Y. : 1991)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined cellular phenotypes plus Co-IP and ubiquitination assays; single lab, two orthogonal methods\",\n      \"pmids\": [\"35989311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Constitutive Zswim8 knockout mice die perinatally with lung sacculation defects (failed alveolar epithelial maturation) and ventricular septal defects. Loss of ZSWIM8 results in aberrant accumulation of >50 miRNAs across 12 tissues, demonstrating that ZSWIM8 specifies the half-lives of most short-lived miRNAs in mice. ZSWIM8-sensitive miRNAs are preferentially produced from genomic miRNA clusters, and ZSWIM8 can cause strand/isoform switching from a miRNA hairpin.\",\n      \"method\": \"Constitutive Zswim8 knockout mouse generation, small RNA sequencing across 12 tissues, mRNA target repression analysis\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular and molecular phenotypes replicated independently (PMID:37532519 and PMID:37553261)\",\n      \"pmids\": [\"37532519\", \"37553261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Deletion of miR-322 and miR-503 rescued embryonic growth restriction in Zswim8-null mice, directly establishing that TDMD-mediated degradation of these specific miRNAs by ZSWIM8 is required for normal mammalian body size.\",\n      \"method\": \"Genetic epistasis in mice — double KO (Zswim8-null × miR-322/503-null) with embryonic growth measurements\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis via double mutant rescue in vivo, independently replicated by two labs (PMID:37553261 and PMID:41213800)\",\n      \"pmids\": [\"37553261\", \"41213800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZSWIM8, as the substrate receptor of the Cullin3-RING E3 ligase complex, is required for Zika virus NS5-mediated degradation of STAT2. NS5 acts as a scaffold that enhances the interaction between STAT2 and the ZSWIM8-CUL3 complex, facilitating STAT2 ubiquitination and proteasomal degradation, thereby suppressing type I interferon signaling.\",\n      \"method\": \"Genome-wide CRISPR/Cas9 screen, genetic depletion of ZSWIM8 and CUL3, biochemical Co-IP showing NS5 bridges STAT2 and ZSWIM8-CUL3, ubiquitination assays, ZSWIM8 KO in A549/Huh7 and human neural progenitor cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide unbiased screen identifying ZSWIM8, confirmed by Co-IP, ubiquitination assay, and functional KO phenotype; multiple orthogonal methods in one study\",\n      \"pmids\": [\"39145933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The Drosophila ZSWIM8 ortholog Pelado/CG34401 promotes linear actin filament polymerization at the expense of branched filaments. Loss of Pelado causes actin hair elongation defects in epithelial cells and loss of filopodia in hemocytes. This function is conserved in human cells, where ZSWIM8 knockdown inhibits cell migration by affecting branched actin polymerization.\",\n      \"method\": \"Drosophila pelado mutant analysis, genetic epistasis with actin regulators (linear vs. branched polymerization), human cell ZSWIM8 knockdown with migration assay and actin cytoskeleton imaging\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in Drosophila combined with human cell KD with defined phenotypic readout; single lab, two orthogonal approaches\",\n      \"pmids\": [\"35940847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZSWIM8 is induced during C2C12 myoblast differentiation and is incorporated into the Cdon/JLP/Bnip-2/CDC42 complex. ZSWIM8 knockdown accelerates C2C12 differentiation, indicating that ZSWIM8 partly prevents myogenic differentiation. However, ZSWIM8-dependent ubiquitination or degradation of Bnip2, Cdon, or JLP was not detected.\",\n      \"method\": \"Co-immunoprecipitation of ZSWIM8 with Cdon complex components, siRNA knockdown of Zswim8 in C2C12 cells with differentiation assay, ubiquitination assay (negative for Bnip2/Cdon/JLP as substrates)\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP demonstrating complex membership and KD with cellular phenotype; single lab; substrate ubiquitination was negative for tested Cdon complex proteins\",\n      \"pmids\": [\"34686700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Drosophila, siRNAs loaded into Ago2 are insensitive to Dora (ZSWIM8 ortholog)-mediated target-directed degradation. This protection is conferred by features of the Ago2 protein itself, not by 2'-O-methylation of the small RNA 3' termini. In contrast, the same siRNAs are sensitive to Dora when loaded into Ago1.\",\n      \"method\": \"Genetic Dora loss-of-function in Drosophila, small RNA sequencing comparing Ago1- vs. Ago2-loaded siRNAs, 2'-O-methylation analysis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO combined with small RNA sequencing and biochemical analysis; single lab, two orthogonal methods\",\n      \"pmids\": [\"33853897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In Drosophila S2 cells, the ZSWIM8 ortholog Dora is required for TDMD; AGO1-CLASH identified five TDMD trigger sequences, including a trigger in the 3' UTR of AGO1 mRNA itself that induces miR-999 degradation. Knockout of the AGO1 trigger in S2 cells and in Drosophila specifically elevated miR-999 with concurrent repression of miR-999 targets.\",\n      \"method\": \"AGO1-CLASH in Dora CRISPR KO Drosophila S2 cells, CRISPR-Cas9 knockout of the AGO1 3' UTR trigger site in S2 cells and in vivo, miRNA/mRNA sequencing\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CLASH-based direct miRNA-target detection combined with in vivo CRISPR deletion and functional readout, multiple orthogonal methods\",\n      \"pmids\": [\"37055443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In C. elegans, EBAX-1 (the ZSWIM8 ortholog) polyubiquitinates AGO, leading to its degradation and exposure of the miRNA to cellular nucleases; 22 miRNAs are sensitive to EBAX-1 loss, with the greatest effect in L1 larvae. The 3' region of a miRNA influences EBAX-1 sensitivity in a variable manner.\",\n      \"method\": \"ebax-1 mutant small RNA sequencing at multiple developmental stages, mRNA target repression analysis, miRNA 3' region replacement experiments\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with small RNA sequencing and mutant miRNA chimera experiments; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"39433399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Drosophila ovarian somatic cells, Dora (ZSWIM8 ortholog) associates with CRL3 complex proteins (Cul3, EloB, EloC), and depletion of CRL3 components or inhibition of Cul3 neddylation (via UbcE2M) upregulates miR-7-5p. Dora localizes to protein granules distinct from P-bodies and GW-bodies. Loss of Dora impairs Notch signaling pathway activity.\",\n      \"method\": \"Co-immunoprecipitation of Dora with CRL3 components, dora CRISPR KO with miRNA sequencing, CRL3 component RNAi, neddylation inhibition, fluorescence localization of tagged Dora\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating CRL3 association combined with genetic KO and pharmacological inhibition; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"40328417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ZSWIM8 is indispensable for oligodendrocyte maturation and myelination. Loss of ZSWIM8 in brain causes accumulation of IDR-rich proteins including RNA-binding proteins; AGO2 stabilization in ZSWIM8-null tissues disrupts TDMD of miR-7, leading to altered gene expression and myelination defects in vivo. ZSWIM8-mediated ubiquitination of AGO2 also requires microRNA binding to AGO2.\",\n      \"method\": \"Conditional ZSWIM8 KO in mouse brain, proteomic analysis of IDR protein accumulation, AGO2 ubiquitination assays, miRNA sequencing, myelination phenotype histology\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined cellular phenotype, ubiquitination assay, and miRNA sequencing; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"41787678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In C. elegans, EBAX-1/ZSWIM8 promotes linker cell-type death (LCD) non-apoptotically and cell-autonomously through TDMD. EBAX-1 requires its Cullin-2 binding motif for LCD. Loss of mir-35 family miRNAs, argonautes, or miRNA biogenesis factors restores LCD to ebax-1 mutants. The predicted miR-35 target viln-1/villin mRNA is upregulated in dying cells and required for LCD.\",\n      \"method\": \"Genetic epistasis (ebax-1 mutant × argonaute/mir-35/biogenesis factor mutants), cell-autonomous rescue, mRNA expression analysis of viln-1, LCD quantitation\",\n      \"journal\": \"bioRxiv : the preprint server for biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple double-mutant combinations establishing pathway position; preprint, single lab\",\n      \"pmids\": [\"41542532\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In Pristionchus pacificus, EBAX-1/ZSWIM8 destabilizes the clustered miRNA family miR-2235a/miR-35, and this is required for transgenerational epigenetic memory of the predatory mouth form after dietary switching. Ppa-ebax-1 mutants show no transgenerational memory; deletion of a cluster of 44 miR-2235a copies results in precocious and extended transgenerational inheritance.\",\n      \"method\": \"ebax-1 mutant analysis, miRNA cluster deletion, dietary induction and food-reversal experiments across multiple generations, miRNA sequencing\",\n      \"journal\": \"bioRxiv : the preprint server for biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genetic KO and deletion in a non-standard model organism (Pristionchus), single lab, preprint only\",\n      \"pmids\": [\"bio_10.1101_2024.09.10.612280\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"ZSWIM8 functions as the substrate-receptor subunit of a Cullin3-RING E3 ubiquitin ligase complex that recognizes AGO proteins engaged in extensive base-pairing with specialized 'trigger' RNAs; cryo-EM and biochemical studies show that this pairing induces conformational changes in AGO (extracting the miRNA from its binding pocket) that are recognized by ZSWIM8 through RNA-RNA, RNA-protein, and protein-protein contacts, triggering AGO polyubiquitylation, proteasomal degradation, and subsequent miRNA decay (target-directed miRNA degradation, TDMD); this pathway controls the half-lives of most short-lived miRNAs across bilaterian animals and is required for normal mammalian development (cardiac, pulmonary, neural, and growth), and ZSWIM8 can also ubiquitinate other IDR-containing substrates (e.g., Dab1) for protein quality control, while additionally serving as a hijackable substrate receptor enabling viral proteins (e.g., ZIKV NS5) to redirect the complex toward non-miRNA substrates such as STAT2.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZSWIM8 is the substrate-receptor subunit of a Cullin-RING E3 ubiquitin ligase that controls miRNA stability by executing target-directed miRNA degradation (TDMD), a pathway conserved across bilaterian animals [#0, #4]. It recognizes Argonaute (AGO) complexes specifically when the loaded miRNA is extensively base-paired to a highly complementary 'trigger' RNA, polyubiquitinates AGO, and routes it for proteasomal degradation, thereby exposing the miRNA to nucleolytic decay in a manner independent of miRNA tailing and trimming [#0, #1, #11]. Cryo-EM and in vitro reconstitution show that trigger pairing extracts the miRNA from a binding pocket in AGO2 and that ZSWIM8 reads out both the exposed pocket and the distinct trajectory of the trigger RNA — a 'two-RNA-factor authentication' mechanism that specifies ubiquitylation without a conventional degron [#1, #2]. Through this activity ZSWIM8 sets the half-lives of most short-lived miRNAs in mammals, and its loss causes perinatal lethality with lung sacculation and ventricular septal defects, while genetic removal of the miR-322/miR-503 cluster rescues the embryonic growth restriction of Zswim8-null mice, establishing TDMD of specific miRNAs as a developmental requirement [#4, #5]. The complex assembles with CRL3 components (Cul3, EloB, EloC) in invertebrate cells, and in C. elegans EBAX-1 requires a Cullin-2 binding motif for one of its activities, indicating context-dependent cullin usage [#12, #14]. Beyond miRNA control, ZSWIM8 performs protein quality control on intrinsically disordered substrates: it eliminates misfolded Disabled-1 (Dab1) via a 'disorder targets misorder' mechanism in the developing nervous system [#3], and it can be hijacked by Zika virus NS5, which scaffolds STAT2 onto the ZSWIM8-CUL3 complex to drive STAT2 degradation and suppress type I interferon signaling [#6]. ZSWIM8/TDMD also shapes oligodendrocyte myelination, neural progenitor migration and synaptogenesis, and developmental cell-fate decisions including non-apoptotic linker-cell death in C. elegans [#3, #13, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 2020,\n      \"claim\": \"Established the core function: how are mature miRNAs actively degraded when engaged by highly complementary targets, answered by identifying ZSWIM8 as a CRL substrate adaptor that destroys AGO to expose the miRNA.\",\n      \"evidence\": \"CRISPR loss-of-function, reciprocal Co-IP of ZSWIM8-CRL with AGO, and small-RNA sequencing across mammals, flies, and nematodes\",\n      \"pmids\": [\"33184237\", \"33184234\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how the complex structurally distinguishes trigger-paired AGO from canonical targets\", \"Did not identify the full repertoire of affected miRNAs in vivo\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined the rate-limiting step and substrate specificity: AGO polyubiquitination and proteasomal degradation is the key regulatory event, and the complex only recognizes extensively trigger-paired AGO.\",\n      \"evidence\": \"In vitro ubiquitylation reconstitution, cellular ubiquitination assays with mutagenesis, and cryo-EM of the AGO2-miRNA-trigger-ZSWIM8 complex\",\n      \"pmids\": [\"41851464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic basis of conformational recognition not fully resolved here\", \"E2 enzyme partners and ubiquitin chain topology not detailed\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Resolved the recognition logic: how is ubiquitylation specified absent a linear degron, answered by a two-RNA-factor authentication mechanism in which trigger pairing extracts the miRNA and ZSWIM8 reads both the exposed AGO2 pocket and the trigger RNA path.\",\n      \"evidence\": \"Cryo-EM structural determination with in vitro reconstitution, active-site mutagenesis, and cellular assays (preprint and journal versions)\",\n      \"pmids\": [\"41851464\", \"41542392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether all triggers engage identical contacts is untested\", \"Kinetics of conformational capture versus dissociation not quantified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated the physiological scope in mammals: ZSWIM8 specifies the half-lives of most short-lived miRNAs and is required for cardiac and pulmonary development.\",\n      \"evidence\": \"Constitutive Zswim8 knockout mouse with small-RNA sequencing across 12 tissues and mRNA target analysis\",\n      \"pmids\": [\"37532519\", \"37553261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The triggers for most affected miRNAs were not identified\", \"Tissue-specific trigger sources not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided causal proof that a defined developmental phenotype results from failed degradation of specific miRNAs, by rescuing growth restriction through miR-322/miR-503 deletion.\",\n      \"evidence\": \"Mouse genetic epistasis with double knockout (Zswim8-null x miR-322/503-null) and embryonic growth measurement\",\n      \"pmids\": [\"37553261\", \"41213800\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other ZSWIM8 phenotypes (cardiac, pulmonary) not attributed to specific miRNAs\", \"Trigger RNA for miR-322/503 not defined in this work\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Broadened ZSWIM8 function beyond miRNAs to protein quality control, showing it eliminates misfolded Dab1 via recognition of intrinsically disordered regions, with neurodevelopmental consequences.\",\n      \"evidence\": \"Conditional CRISPR knockout in mouse nervous system, Co-IP, ubiquitination assays, and neuronal spine/synapse imaging\",\n      \"pmids\": [\"35989311\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; generality of the 'disorder targets misorder' rule across substrates untested\", \"Relative contribution of TDMD versus Dab1 quality control to the neural phenotype unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extended ZSWIM8's role to glial development, linking AGO2 stabilization and disrupted miR-7 TDMD plus IDR-protein accumulation to myelination defects.\",\n      \"evidence\": \"Conditional ZSWIM8 brain knockout with proteomics, AGO2 ubiquitination assays, miRNA sequencing, and myelination histology\",\n      \"pmids\": [\"41787678\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; which IDR-protein substrates drive the phenotype not pinned down\", \"Causal separation of TDMD versus protein-quality-control contributions incomplete\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed ZSWIM8 as a hijackable substrate receptor: Zika virus NS5 scaffolds STAT2 onto ZSWIM8-CUL3 to drive its degradation and dampen interferon signaling.\",\n      \"evidence\": \"Genome-wide CRISPR screen, ZSWIM8/CUL3 depletion, bridging Co-IP, and ubiquitination assays in A549/Huh7 and neural progenitor cells\",\n      \"pmids\": [\"39145933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other viral or endogenous adaptors redirect ZSWIM8 similarly is unknown\", \"Structural basis of NS5-mediated bridging not determined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Addressed substrate determinants by showing AGO protein identity, not small-RNA modification, governs TDMD sensitivity in Drosophila.\",\n      \"evidence\": \"Dora loss-of-function with small-RNA sequencing comparing Ago1- versus Ago2-loaded siRNAs and 2'-O-methylation analysis\",\n      \"pmids\": [\"33853897\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The AGO2 features conferring protection were not mapped\", \"Single-organism observation\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified endogenous triggers and an autoregulatory loop, showing the AGO1 3'UTR itself encodes a trigger that drives miR-999 degradation in flies.\",\n      \"evidence\": \"AGO1-CLASH in Dora-KO S2 cells with in vivo CRISPR deletion of the trigger site and miRNA/mRNA sequencing\",\n      \"pmids\": [\"37055443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conservation of the AGO1-encoded trigger to mammals untested\", \"Functional consequence of the autoregulatory loop on AGO homeostasis unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Confirmed conservation of the degradation mechanism in C. elegans, where EBAX-1 polyubiquitinates AGO to expose miRNAs to nucleases with developmental-stage specificity.\",\n      \"evidence\": \"ebax-1 mutant small-RNA sequencing across stages and miRNA 3'-region replacement experiments\",\n      \"pmids\": [\"39433399\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The nucleases degrading exposed miRNAs not identified\", \"Variable role of the miRNA 3' region not mechanistically explained\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Clarified cullin and granule context in flies, associating Dora with CRL3 (Cul3/EloB/EloC) and localizing it to distinct protein granules, with loss impairing Notch signaling.\",\n      \"evidence\": \"Co-IP with CRL3 components, dora KO with miRNA sequencing, CRL3 RNAi, neddylation inhibition, and fluorescence localization\",\n      \"pmids\": [\"40328417\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Composition and function of the Dora granules undefined\", \"Direct miRNA connecting Dora loss to Notch defects not established\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Linked ZSWIM8/EBAX-1 to a developmental cell-death program, showing it drives non-apoptotic linker-cell death cell-autonomously via TDMD of miR-35 family miRNAs.\",\n      \"evidence\": \"Genetic epistasis of ebax-1 with argonaute/mir-35/biogenesis mutants, cell-autonomous rescue, and viln-1 expression analysis (preprint)\",\n      \"pmids\": [\"41542532\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, single lab\", \"The trigger RNA inducing miR-35 degradation in dying cells not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved which RNA features universally define a competent trigger across species and how the same complex partitions its activity between miRNA degradation and IDR-protein quality control in a given cell.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No general predictive rule for trigger RNA competence\", \"No systematic catalog of non-AGO IDR substrates\", \"Determinants selecting Cul3 versus Cul2 partners across contexts unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 3, 6, 11]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 6, 12]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 4, 11]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 3, 6]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 5, 13]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [\n      \"Cullin3-RING E3 ubiquitin ligase (CRL3)\",\n      \"Cdon/JLP/Bnip-2/CDC42 complex\"\n    ],\n    \"partners\": [\n      \"AGO2\",\n      \"CUL3\",\n      \"EloB\",\n      \"EloC\",\n      \"DAB1\",\n      \"STAT2\",\n      \"Cdon\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}