{"gene":"STAU2","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":2017,"finding":"UPF1 interacts with the RNA-binding protein STAU2 and this interaction is necessary for proper transport and local translation from a prototypical RNA granule substrate (prototypical STAU2 RNA granule), as well as for mGluR-LTD in hippocampal neurons. UPF1 is critical for assembly of stalled polysomes in rat hippocampal neurons, and its interaction with STAU2 is required for this process.","method":"Co-immunoprecipitation, knockdown experiments, live imaging, synaptic plasticity assays (mGluR-LTD) in rat hippocampal neurons","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal co-IP and functional KD with defined cellular phenotype (LTD impairment), single lab","pmids":["28821679"],"is_preprint":false},{"year":2021,"finding":"Chicken STAU2 (Staufen double-stranded RNA-binding protein 2) physically interacts with H5N1 avian influenza virus non-structural protein 1 (NS1) and promotes viral replication by enhancing the nuclear export of NS1 mRNA.","method":"Affinity purification mass spectrometry (AP-MS), co-immunoprecipitation, knockdown/overexpression with viral replication readout","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 — AP-MS plus co-IP plus functional KD/OE with defined phenotype, single lab, chicken ortholog","pmids":["33968009"],"is_preprint":false},{"year":2019,"finding":"Stau2 downregulation in mouse cerebellar Purkinje cells leads to increased GluD2 (glutamate receptor ionotropic delta subunit 2) expression during physical activity, and Stau2-deficient mice show altered motor coordination and enhanced motor learning, indicating Stau2 regulates GluD2 expression and Purkinje cell synaptogenesis.","method":"Stau2 gene-trap mouse model (Stau2GT), immunofluorescence, behavioral assays (rotarod, voluntary running wheel)","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo KO with specific molecular and behavioral phenotype, single lab","pmids":["30979012"],"is_preprint":false},{"year":2016,"finding":"STAU2 colocalizes with the meiotic spindle in mouse oocytes at MI and MII stages, and its assembly on microtubules requires both microtubule integrity and normal microtubule dynamics. Morpholino-mediated Stau2 knockdown disrupts spindle formation, chromosome alignment, and microtubule-kinetochore attachment, arresting most oocytes at MI with activated spindle assembly checkpoint (MAD1 signal at kinetochores).","method":"Morpholino knockdown, immunofluorescence, nocodazole/taxol treatment, Western blot in mouse oocytes","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment tied to functional consequence (spindle failure, SAC activation) via KD with specific readouts, single lab","pmids":["27433972"],"is_preprint":false},{"year":2021,"finding":"STAU2 binds a complex and temporally regulated RNA cargo during mouse corticogenesis, with a 'stable' subset involved in chromosome organization, macromolecule localization, translation, and DNA repair, and a 'dynamic' subset changing with cortical stage and involved in neurogenesis and cell projection organization. During asymmetric divisions STAU2 preferentially distributes into intermediate progenitor cells (IPCs), delivering this RNA cargo. Knockdown of one STAU2 target, Taf13, reduced oligodendrogenesis in vitro.","method":"RNA-immunoprecipitation sequencing (RIP-seq) across four developmental stages, in vitro knockdown","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — RIP-seq across multiple stages with functional follow-up of one target, single lab","pmids":["34345913"],"is_preprint":false},{"year":2021,"finding":"STAU2 protein steady-state levels are controlled by caspase-mediated degradation, and this is counterbalanced by the CHK1 kinase pathway. CRISPR/Cas9 and RNAi-mediated STAU2 depletion in non-transformed hTERT-RPE1 cells facilitates cell proliferation, indicating STAU2 influences cell cycle control pathways. Proximity proteomics (STAU2/biotinylase fusion) identified known STAU2 interactors in RNA translation, localization, splicing, and decay, plus nucleolar proteins of the ribosome biogenesis and DNA damage response pathways linked to CHK1.","method":"CRISPR/Cas9 KO, RNAi knockdown, caspase inhibitor treatment, CHK1 pathway inhibition, BioID proximity proteomics, cell proliferation assays","journal":"BMC molecular and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (genetic KO, RNAi, pharmacological, BioID) in single lab with defined cellular phenotype","pmids":["33663378"],"is_preprint":false},{"year":2023,"finding":"RNF216, a ubiquitin E3 ligase, interacts with STAU2 and affects STAU2 stability through the ubiquitin-proteasome pathway. In RNF216 knockout mice, STAU2 levels in the hypothalamus are increased compared to wild-type mice, indicating RNF216 promotes STAU2 degradation.","method":"Co-immunoprecipitation, RNF216 knockout mice, Western blot, RNA sequencing","journal":"Development, growth & differentiation","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus in vivo KO with molecular phenotype (elevated STAU2), single lab","pmids":["37439148"],"is_preprint":false},{"year":2024,"finding":"EV-A71 viral protease 3C interacts with STAU2 and cleaves it at the Q507-G508 site. Overexpression of STAU2 promotes EV-A71 VP1 protein expression and replication, whereas siRNA depletion of STAU2 inhibits viral replication. The cleavage product comprising aa 508–570 has activity that promotes EV-A71 replication.","method":"Co-immunoprecipitation, immunofluorescence assay, site-directed mutagenesis of cleavage site, Western blot (VP1 as replication readout), siRNA knockdown, overexpression of truncation constructs","journal":"Virology journal","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP, mutagenesis identifying cleavage site, KD and OE with functional readout, single lab","pmids":["39272111"],"is_preprint":false},{"year":2022,"finding":"STAU2 directly binds and regulates the mRNA/protein of cytoskeletal associated protein Palladin (PALLD) and mediates IQ motif containing GTPase-activating protein 1 (IQGAP1), thereby promoting metastasis via the EMT pathway in pancreatic ductal adenocarcinoma cells. Knockdown of STAU2 led to decreased PAAD cell growth, migration, invasion and induced apoptosis.","method":"Knockdown/overexpression, multiple omics analyses, cell migration/invasion assays, apoptosis assays","journal":"Cancers","confidence":"Low","confidence_rationale":"Tier 3 — functional KD with phenotype and target identification by omics, but limited direct binding validation in this paper","pmids":["35892886"],"is_preprint":false},{"year":2025,"finding":"STAU2 directly binds Palladin (PALLD) and mediates IQGAP1, promoting PDAC metastasis via the EMT signaling pathway. An antisense oligonucleotide (ASO) targeting STAU2 effectively inhibited downstream targets and suppressed PDAC progression and metastasis in vitro and in vivo.","method":"RNA-binding assays, ASO treatment, in vitro and in vivo tumor models, Western blot, invasion/migration assays","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding demonstrated plus in vivo functional rescue with ASO, single lab","pmids":["40539383"],"is_preprint":false},{"year":2025,"finding":"Loss of STAU2 in human iPSC-derived neural cells disrupts neuroepithelial cell identity and accelerates neural differentiation by altering key transcription factor activity and driving early metabolic transitions. STAU2 also regulates miRNA host gene expression and alters miRNA-mediated post-transcriptional control in progenitor cells, resulting in neural progenitor exhaustion, unstructured neural rosettes, and reduced organoid size.","method":"STAU2 knockout iPSCs, scRNA-seq, organoid culture, neural differentiation assays","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 — preprint, single lab, scRNA-seq with functional phenotype but limited direct mechanistic validation","pmids":[],"is_preprint":true}],"current_model":"STAU2 is a double-stranded RNA-binding protein that forms RNA granules with UPF1 to regulate mRNA transport and local translation at synapses (supporting mGluR-LTD), controls asymmetric distribution of RNA cargo into neural progenitor cells during corticogenesis, regulates spindle integrity in meiosis, modulates cell cycle progression through caspase- and CHK1-dependent control of its own stability (with RNF216 as a ubiquitin E3 ligase that destabilizes it), and directly binds target mRNAs such as PALLD to promote EMT in cancer; viral proteases (EV-A71 3C) can cleave STAU2 at Q507-G508 to co-opt its pro-replicative activity."},"narrative":{"teleology":[{"year":2016,"claim":"Establishing that STAU2 localizes to the meiotic spindle and is required for spindle integrity resolved whether STAU2 has cytoskeletal functions beyond mRNA transport, demonstrating a role in microtubule-kinetochore attachment and spindle assembly checkpoint activation in oocytes.","evidence":"Morpholino knockdown with immunofluorescence and drug perturbation of microtubule dynamics in mouse oocytes","pmids":["27433972"],"confidence":"Medium","gaps":["Mechanism by which an RNA-binding protein stabilizes spindle microtubules is unknown","Whether STAU2 acts through local mRNA translation at the spindle or via direct protein-protein interactions is unresolved","Not tested in mitotic cells"]},{"year":2017,"claim":"Identification of UPF1 as a functional STAU2 partner established that RNA granule assembly requires UPF1 for dendritic mRNA transport and local translation, and linked this complex to mGluR-LTD, answering how STAU2 granules contribute to synaptic plasticity.","evidence":"Reciprocal co-immunoprecipitation, knockdown, live imaging, and mGluR-LTD electrophysiology in rat hippocampal neurons","pmids":["28821679"],"confidence":"Medium","gaps":["Specific RNA targets within the granule that mediate LTD are not identified","Whether UPF1's role is catalytic (NMD-related) or structural within the granule is unclear"]},{"year":2019,"claim":"Demonstrating that STAU2 deficiency upregulates GluD2 and alters motor coordination in vivo extended STAU2's role from hippocampal to cerebellar circuits, establishing it as a regulator of Purkinje cell synaptogenesis and motor learning.","evidence":"Stau2 gene-trap mouse with immunofluorescence and rotarod/running-wheel behavioral assays","pmids":["30979012"],"confidence":"Medium","gaps":["Whether STAU2 directly binds GluD2 mRNA or acts indirectly is not determined","Mechanism linking physical activity to STAU2-dependent GluD2 regulation is unknown"]},{"year":2021,"claim":"RIP-seq across cortical development stages and asymmetric division analyses revealed that STAU2 binds a stage-specific RNA cargo and preferentially segregates into intermediate progenitor cells, answering how post-transcriptional regulation contributes to neural progenitor diversification.","evidence":"RIP-seq at four developmental stages in mouse cortex with in vitro knockdown of target Taf13","pmids":["34345913"],"confidence":"Medium","gaps":["Only one cargo (Taf13) functionally validated","How STAU2 is asymmetrically localized during division is mechanistically unresolved"]},{"year":2021,"claim":"Discovery that STAU2 protein levels are governed by opposing caspase-mediated degradation and CHK1-dependent stabilization, and that STAU2 loss accelerates proliferation, revealed a cell-cycle checkpoint role independent of its neuronal functions.","evidence":"CRISPR/Cas9 KO and RNAi in hTERT-RPE1 cells, caspase/CHK1 inhibitors, BioID proximity proteomics, proliferation assays","pmids":["33663378"],"confidence":"Medium","gaps":["Whether CHK1 directly phosphorylates STAU2 or acts indirectly is unknown","Specific caspase(s) responsible for STAU2 cleavage not identified","Whether this proliferation phenotype is RNA-binding-dependent remains untested"]},{"year":2023,"claim":"Identification of RNF216 as a ubiquitin E3 ligase that targets STAU2 for proteasomal degradation provided a second post-translational control axis, with in vivo validation showing elevated STAU2 in RNF216 knockout hypothalamus.","evidence":"Co-immunoprecipitation and Western blot in RNF216 knockout mice","pmids":["37439148"],"confidence":"Medium","gaps":["Ubiquitination sites on STAU2 not mapped","Functional consequence of elevated STAU2 in hypothalamus not characterized","Relationship between RNF216 and caspase/CHK1 regulatory axes is unexplored"]},{"year":2024,"claim":"Demonstration that EV-A71 protease 3C cleaves STAU2 at Q507-G508 and that the C-terminal fragment promotes viral replication revealed how a virus co-opts STAU2's RNA-binding activity, complementing earlier evidence that STAU2 promotes H5N1 replication via NS1 mRNA export.","evidence":"Co-IP, site-directed mutagenesis of cleavage site, siRNA knockdown, and overexpression of truncation constructs in EV-A71-infected cells","pmids":["39272111"],"confidence":"Medium","gaps":["How the 63-amino-acid C-terminal fragment promotes replication is mechanistically unclear","Whether cleavage-resistant STAU2 alters viral fitness in vivo is untested"]},{"year":2025,"claim":"Direct binding of STAU2 to PALLD mRNA and in vivo ASO-mediated suppression of PDAC metastasis established STAU2 as a driver of epithelial-to-mesenchymal transition via PALLD/IQGAP1 signaling, extending its functional repertoire to cancer.","evidence":"RNA-binding assays, ASO treatment, in vitro and in vivo PDAC tumor models","pmids":["40539383"],"confidence":"Medium","gaps":["Whether STAU2 stabilizes or translationally activates PALLD mRNA is not distinguished","Generalizability beyond PDAC is untested"]},{"year":null,"claim":"The structural basis of STAU2's RNA cargo selectivity, the identity of direct phosphorylation sites mediating CHK1-dependent stabilization, and whether STAU2's meiotic spindle role requires RNA binding or protein-protein interactions remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of STAU2 bound to a specific endogenous RNA target","CHK1 phosphorylation sites on STAU2 not mapped","Mechanistic link between RNA binding and spindle function is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,4,8,9]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,5]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,4,5]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,2]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5,6]}],"complexes":["STAU2–UPF1 RNA granule"],"partners":["UPF1","RNF216","PALLD","IQGAP1","NS1"],"other_free_text":[]},"mechanistic_narrative":"STAU2 is a double-stranded RNA-binding protein that governs mRNA transport, translational control, and cell fate decisions in neuronal and progenitor cells. In hippocampal neurons, STAU2 partners with UPF1 to assemble RNA granules required for dendritic mRNA transport, stalled polysome formation, and mGluR-dependent long-term depression [PMID:28821679]; during corticogenesis, it binds a temporally regulated RNA cargo and is asymmetrically partitioned into intermediate progenitor cells, coupling mRNA localization to neural lineage diversification [PMID:34345913]. STAU2 protein stability is regulated by caspase-mediated cleavage counterbalanced by the CHK1 kinase pathway and by RNF216-dependent ubiquitin–proteasome degradation, and its depletion accelerates cell proliferation, linking STAU2 to cell-cycle control [PMID:33663378, PMID:37439148]. Beyond the nervous system, STAU2 directly binds PALLD mRNA and mediates IQGAP1 signaling to promote epithelial-to-mesenchymal transition and metastasis in pancreatic ductal adenocarcinoma [PMID:40539383]."},"prefetch_data":{"uniprot":{"accession":"Q9NUL3","full_name":"Double-stranded RNA-binding protein Staufen homolog 2","aliases":[],"length_aa":570,"mass_kda":62.6,"function":"RNA-binding protein required for the microtubule-dependent transport of neuronal RNA from the cell body to the dendrite. As protein synthesis occurs within the dendrite, the localization of specific mRNAs to dendrites may be a prerequisite for neurite outgrowth and plasticity at sites distant from the cell body (By similarity)","subcellular_location":"Cytoplasm; Nucleus; Nucleus, nucleolus; Endoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/Q9NUL3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/STAU2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DDOST","stoichiometry":0.2},{"gene":"DDX21","stoichiometry":0.2},{"gene":"DHX9","stoichiometry":0.2},{"gene":"DRG1","stoichiometry":0.2},{"gene":"IGF2BP1","stoichiometry":0.2},{"gene":"ILF3","stoichiometry":0.2},{"gene":"OST4","stoichiometry":0.2},{"gene":"RACK1","stoichiometry":0.2},{"gene":"RBM14","stoichiometry":0.2},{"gene":"RBM8A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/STAU2","total_profiled":1310},"omim":[{"mim_id":"605920","title":"STAUFEN DOUBLE-STRANDED RNA-BINDING PROTEIN 2; STAU2","url":"https://www.omim.org/entry/605920"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/STAU2"},"hgnc":{"alias_symbol":["39K2"],"prev_symbol":[]},"alphafold":{"accession":"Q9NUL3","domains":[{"cath_id":"3.30.160.20","chopping":"10-73","consensus_level":"high","plddt":94.0242,"start":10,"end":73},{"cath_id":"3.30.160.20","chopping":"97-119_142-181","consensus_level":"high","plddt":88.2792,"start":97,"end":181},{"cath_id":"3.30.160.20","chopping":"210-275","consensus_level":"high","plddt":91.2524,"start":210,"end":275},{"cath_id":"3.30.160.20","chopping":"309-374","consensus_level":"high","plddt":91.0048,"start":309,"end":374}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NUL3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NUL3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NUL3-F1-predicted_aligned_error_v6.png","plddt_mean":70.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=STAU2","jax_strain_url":"https://www.jax.org/strain/search?query=STAU2"},"sequence":{"accession":"Q9NUL3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NUL3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NUL3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NUL3"}},"corpus_meta":[{"pmid":"21148689","id":"PMC_21148689","title":"Wide 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transport and local translation of RNA granule substrates, and mGluR-LTD in rat hippocampal neurons\",\n      \"method\": \"Co-immunoprecipitation, neuronal knockdown, mGluR-LTD electrophysiology, polysome profiling\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction shown, KD with defined cellular phenotype (LTD, polysome assembly), single lab\",\n      \"pmids\": [\"28821679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Chicken STAU2 interacts with H5N1 avian influenza NS1 protein and promotes viral replication by enhancing nuclear export of NS1 mRNA\",\n      \"method\": \"Affinity purification-mass spectrometry (AP-MS), Co-IP, knockdown/overexpression with viral replication readout\",\n      \"journal\": \"Frontiers in Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — AP-MS plus functional KD/OE with defined viral replication phenotype, single lab; ortholog study in chicken\",\n      \"pmids\": [\"33968009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"STAU2 colocalizes with the meiotic spindle in mouse oocytes in a microtubule dynamics-dependent manner; morpholino-mediated knockdown disrupts spindle formation, chromosome alignment, microtubule-kinetochore attachment, and activates the spindle assembly checkpoint, arresting oocytes at MI\",\n      \"method\": \"Immunofluorescence, morpholino knockdown, nocodazole/taxol microtubule perturbation, MAD1 kinetochore staining\",\n      \"journal\": \"Cell Cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiments with functional KD phenotype, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"27433972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STAU2 binds a complex, temporally regulated RNA cargo during mouse corticogenesis and preferentially distributes into intermediate progenitor cells (IPCs) during asymmetric divisions; knockdown of one STAU2 target (Taf13) reduces oligodendrogenesis in vitro\",\n      \"method\": \"RNA-immunoprecipitation sequencing (RIP-seq), in vitro knockdown with lineage differentiation readout\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP-seq with temporal resolution, functional validation of cargo KD, single lab\",\n      \"pmids\": [\"34345913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STAU2 protein levels are controlled by caspase-mediated degradation, counterbalanced by the CHK1 pathway; CRISPR/RNAi depletion of STAU2 in non-transformed hTERT-RPE1 cells accelerates proliferation, and CHK1 inhibition dissociates STAU2 from translation and RNA metabolism complexes\",\n      \"method\": \"CRISPR/Cas9 KO, RNAi, proximity biotinylation (BioID) proteomics, caspase/CHK1 inhibitor treatments, cell proliferation assays\",\n      \"journal\": \"BMC Molecular and Cell Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genetic and pharmacological methods, BioID interactome, single lab\",\n      \"pmids\": [\"33663378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RNF216, a ubiquitin E3 ligase, interacts with STAU2 and controls its stability through the ubiquitin-proteasome pathway; deletion of RNF216 in mice increases STAU2 levels in the hypothalamus\",\n      \"method\": \"Co-immunoprecipitation, RNF216 knockout mouse model, Western blot, RNA sequencing\",\n      \"journal\": \"Development, Growth & Differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus in vivo KO model with protein level readout, single lab\",\n      \"pmids\": [\"37439148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"EV-A71 3C protease interacts with STAU2 and cleaves it at the Q507-G508 site; overexpression of STAU2 promotes EV-A71 replication while siRNA depletion inhibits it; the cleavage product (aa 508–570) retains activity promoting viral replication\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, site-directed mutagenesis of cleavage site, Stau2 truncation constructs, siRNA knockdown/overexpression with VP1 Western blot readout\",\n      \"journal\": \"Virology Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis identifying specific cleavage site plus KD/OE functional validation, single lab\",\n      \"pmids\": [\"39272111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Stau2 downregulation in mice (Stau2GT) leads to increased GluD2 (glutamate receptor delta 2) expression in cerebellar Purkinje cell dendrites during physical activity, accompanied by impaired motor coordination but enhanced motor learning\",\n      \"method\": \"Gene-trap mouse model (Stau2GT), immunofluorescence, motor behavior assays (rotarod)\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — in vivo KO with phenotype but limited molecular mechanism elucidated, single lab\",\n      \"pmids\": [\"30979012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STAU2 directly binds PALLD mRNA and regulates PALLD and IQGAP1 expression, promoting EMT and metastasis in pancreatic ductal adenocarcinoma; ASO-mediated STAU2 knockdown suppresses PDAC progression and metastasis in vivo\",\n      \"method\": \"RNA immunoprecipitation, ASO knockdown, in vitro migration/invasion assays, in vivo xenograft models, Western blot for EMT markers\",\n      \"journal\": \"Advanced Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct RNA binding shown by RIP, in vivo functional validation, single lab\",\n      \"pmids\": [\"40539383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STAU2 knockout in human iPSC-derived neural cells disrupts neuroepithelial identity, accelerates neural differentiation, causes neural progenitor exhaustion, and alters miRNA-mediated post-transcriptional control; STAU2 acts through both miRNA-mediated and transcriptional pathways to maintain progenitor identity\",\n      \"method\": \"CRISPR KO iPSCs, single-cell RNA sequencing, neural organoid differentiation, miRNA pathway analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 — scRNA-seq and KO with organoid phenotype, but preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2025.10.02.679988\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"STAU2 is a double-stranded RNA-binding protein that assembles into RNA granules and mediates mRNA transport, localization, and translational regulation in neurons and progenitor cells; its stability is controlled by caspases (degradation) and the CHK1 pathway (stabilization), as well as by RNF216-mediated ubiquitin-proteasome degradation; it interacts with UPF1 to form stalled polysome granules required for mGluR-LTD, binds temporally regulated RNA cargo for delivery into intermediate progenitor cells during corticogenesis, is required for meiotic spindle integrity in oocytes, and is co-opted by viral proteases (EV-A71 3C cleaving at Q507-G508) and viral proteins (influenza NS1) to promote viral replication.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2017,\n      \"finding\": \"UPF1 interacts with the RNA-binding protein STAU2 and this interaction is necessary for proper transport and local translation from a prototypical RNA granule substrate (prototypical STAU2 RNA granule), as well as for mGluR-LTD in hippocampal neurons. UPF1 is critical for assembly of stalled polysomes in rat hippocampal neurons, and its interaction with STAU2 is required for this process.\",\n      \"method\": \"Co-immunoprecipitation, knockdown experiments, live imaging, synaptic plasticity assays (mGluR-LTD) in rat hippocampal neurons\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP and functional KD with defined cellular phenotype (LTD impairment), single lab\",\n      \"pmids\": [\"28821679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Chicken STAU2 (Staufen double-stranded RNA-binding protein 2) physically interacts with H5N1 avian influenza virus non-structural protein 1 (NS1) and promotes viral replication by enhancing the nuclear export of NS1 mRNA.\",\n      \"method\": \"Affinity purification mass spectrometry (AP-MS), co-immunoprecipitation, knockdown/overexpression with viral replication readout\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — AP-MS plus co-IP plus functional KD/OE with defined phenotype, single lab, chicken ortholog\",\n      \"pmids\": [\"33968009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Stau2 downregulation in mouse cerebellar Purkinje cells leads to increased GluD2 (glutamate receptor ionotropic delta subunit 2) expression during physical activity, and Stau2-deficient mice show altered motor coordination and enhanced motor learning, indicating Stau2 regulates GluD2 expression and Purkinje cell synaptogenesis.\",\n      \"method\": \"Stau2 gene-trap mouse model (Stau2GT), immunofluorescence, behavioral assays (rotarod, voluntary running wheel)\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO with specific molecular and behavioral phenotype, single lab\",\n      \"pmids\": [\"30979012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"STAU2 colocalizes with the meiotic spindle in mouse oocytes at MI and MII stages, and its assembly on microtubules requires both microtubule integrity and normal microtubule dynamics. Morpholino-mediated Stau2 knockdown disrupts spindle formation, chromosome alignment, and microtubule-kinetochore attachment, arresting most oocytes at MI with activated spindle assembly checkpoint (MAD1 signal at kinetochores).\",\n      \"method\": \"Morpholino knockdown, immunofluorescence, nocodazole/taxol treatment, Western blot in mouse oocytes\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment tied to functional consequence (spindle failure, SAC activation) via KD with specific readouts, single lab\",\n      \"pmids\": [\"27433972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STAU2 binds a complex and temporally regulated RNA cargo during mouse corticogenesis, with a 'stable' subset involved in chromosome organization, macromolecule localization, translation, and DNA repair, and a 'dynamic' subset changing with cortical stage and involved in neurogenesis and cell projection organization. During asymmetric divisions STAU2 preferentially distributes into intermediate progenitor cells (IPCs), delivering this RNA cargo. Knockdown of one STAU2 target, Taf13, reduced oligodendrogenesis in vitro.\",\n      \"method\": \"RNA-immunoprecipitation sequencing (RIP-seq) across four developmental stages, in vitro knockdown\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP-seq across multiple stages with functional follow-up of one target, single lab\",\n      \"pmids\": [\"34345913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STAU2 protein steady-state levels are controlled by caspase-mediated degradation, and this is counterbalanced by the CHK1 kinase pathway. CRISPR/Cas9 and RNAi-mediated STAU2 depletion in non-transformed hTERT-RPE1 cells facilitates cell proliferation, indicating STAU2 influences cell cycle control pathways. Proximity proteomics (STAU2/biotinylase fusion) identified known STAU2 interactors in RNA translation, localization, splicing, and decay, plus nucleolar proteins of the ribosome biogenesis and DNA damage response pathways linked to CHK1.\",\n      \"method\": \"CRISPR/Cas9 KO, RNAi knockdown, caspase inhibitor treatment, CHK1 pathway inhibition, BioID proximity proteomics, cell proliferation assays\",\n      \"journal\": \"BMC molecular and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genetic KO, RNAi, pharmacological, BioID) in single lab with defined cellular phenotype\",\n      \"pmids\": [\"33663378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RNF216, a ubiquitin E3 ligase, interacts with STAU2 and affects STAU2 stability through the ubiquitin-proteasome pathway. In RNF216 knockout mice, STAU2 levels in the hypothalamus are increased compared to wild-type mice, indicating RNF216 promotes STAU2 degradation.\",\n      \"method\": \"Co-immunoprecipitation, RNF216 knockout mice, Western blot, RNA sequencing\",\n      \"journal\": \"Development, growth & differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus in vivo KO with molecular phenotype (elevated STAU2), single lab\",\n      \"pmids\": [\"37439148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"EV-A71 viral protease 3C interacts with STAU2 and cleaves it at the Q507-G508 site. Overexpression of STAU2 promotes EV-A71 VP1 protein expression and replication, whereas siRNA depletion of STAU2 inhibits viral replication. The cleavage product comprising aa 508–570 has activity that promotes EV-A71 replication.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence assay, site-directed mutagenesis of cleavage site, Western blot (VP1 as replication readout), siRNA knockdown, overexpression of truncation constructs\",\n      \"journal\": \"Virology journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP, mutagenesis identifying cleavage site, KD and OE with functional readout, single lab\",\n      \"pmids\": [\"39272111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"STAU2 directly binds and regulates the mRNA/protein of cytoskeletal associated protein Palladin (PALLD) and mediates IQ motif containing GTPase-activating protein 1 (IQGAP1), thereby promoting metastasis via the EMT pathway in pancreatic ductal adenocarcinoma cells. Knockdown of STAU2 led to decreased PAAD cell growth, migration, invasion and induced apoptosis.\",\n      \"method\": \"Knockdown/overexpression, multiple omics analyses, cell migration/invasion assays, apoptosis assays\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — functional KD with phenotype and target identification by omics, but limited direct binding validation in this paper\",\n      \"pmids\": [\"35892886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STAU2 directly binds Palladin (PALLD) and mediates IQGAP1, promoting PDAC metastasis via the EMT signaling pathway. An antisense oligonucleotide (ASO) targeting STAU2 effectively inhibited downstream targets and suppressed PDAC progression and metastasis in vitro and in vivo.\",\n      \"method\": \"RNA-binding assays, ASO treatment, in vitro and in vivo tumor models, Western blot, invasion/migration assays\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding demonstrated plus in vivo functional rescue with ASO, single lab\",\n      \"pmids\": [\"40539383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Loss of STAU2 in human iPSC-derived neural cells disrupts neuroepithelial cell identity and accelerates neural differentiation by altering key transcription factor activity and driving early metabolic transitions. STAU2 also regulates miRNA host gene expression and alters miRNA-mediated post-transcriptional control in progenitor cells, resulting in neural progenitor exhaustion, unstructured neural rosettes, and reduced organoid size.\",\n      \"method\": \"STAU2 knockout iPSCs, scRNA-seq, organoid culture, neural differentiation assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — preprint, single lab, scRNA-seq with functional phenotype but limited direct mechanistic validation\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"STAU2 is a double-stranded RNA-binding protein that forms RNA granules with UPF1 to regulate mRNA transport and local translation at synapses (supporting mGluR-LTD), controls asymmetric distribution of RNA cargo into neural progenitor cells during corticogenesis, regulates spindle integrity in meiosis, modulates cell cycle progression through caspase- and CHK1-dependent control of its own stability (with RNF216 as a ubiquitin E3 ligase that destabilizes it), and directly binds target mRNAs such as PALLD to promote EMT in cancer; viral proteases (EV-A71 3C) can cleave STAU2 at Q507-G508 to co-opt its pro-replicative activity.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"STAU2 is a double-stranded RNA-binding protein that assembles into RNA granules to regulate mRNA transport, localization, translational control, and stability in neurons, neural progenitors, and other cell types. In hippocampal neurons, STAU2 interacts with UPF1 to form stalled polysome-containing granules required for local translation and mGluR-dependent long-term depression [PMID:28821679], while during corticogenesis it binds a temporally regulated RNA cargo that is asymmetrically distributed into intermediate progenitor cells to influence cell-fate decisions [PMID:34345913]. STAU2 protein turnover is regulated by caspase-mediated degradation counterbalanced by the CHK1 pathway [PMID:33663378] and by RNF216-mediated ubiquitin–proteasome degradation [PMID:37439148]. Beyond neural functions, STAU2 is co-opted by viral proteases and proteins—EV-A71 3Cpro cleaves STAU2 at Q507–G508 to generate a pro-viral fragment [PMID:39272111], and influenza NS1 recruits STAU2 to enhance viral mRNA nuclear export [PMID:33968009]—and it promotes epithelial–mesenchymal transition in pancreatic cancer by binding PALLD mRNA and regulating PALLD/IQGAP1 expression [PMID:40539383].\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Establishing that STAU2 has functions beyond post-mitotic neurons, this work showed STAU2 localizes to the meiotic spindle in oocytes in a microtubule-dependent manner and is required for proper spindle formation, chromosome alignment, and kinetochore–microtubule attachment.\",\n      \"evidence\": \"Morpholino knockdown in mouse oocytes with immunofluorescence, nocodazole/taxol perturbation, and MAD1 staining\",\n      \"pmids\": [\"27433972\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether STAU2 acts via RNA cargo regulation or direct protein interactions at the spindle is unknown\",\n        \"No identification of specific mRNA targets at the meiotic spindle\",\n        \"Not replicated in a second species or lab\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolving how STAU2 granules achieve local translation in dendrites, UPF1 was identified as a STAU2 interactor required for stalled polysome assembly and mGluR-LTD, linking RNA granule composition to synaptic plasticity.\",\n      \"evidence\": \"Co-immunoprecipitation, neuronal knockdown, polysome profiling, and mGluR-LTD electrophysiology in rat hippocampal neurons\",\n      \"pmids\": [\"28821679\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific mRNA substrates co-regulated by STAU2–UPF1 in LTD remain unidentified\",\n        \"Whether UPF1's nonsense-mediated decay activity or an NMD-independent role is involved is unclear\",\n        \"Single lab study\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"In vivo loss-of-function in a gene-trap mouse revealed that STAU2 downregulation leads to increased GluD2 expression in Purkinje cell dendrites and altered motor behavior, providing the first cerebellar phenotype for STAU2.\",\n      \"evidence\": \"Gene-trap Stau2GT mouse model with immunofluorescence and rotarod motor behavior assays\",\n      \"pmids\": [\"30979012\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Mechanism by which STAU2 controls GluD2 levels (direct RNA binding vs. indirect) is not established\",\n        \"Limited molecular characterization beyond GluD2 expression change\",\n        \"No rescue experiment performed\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Three independent studies collectively defined STAU2's regulation and broader biological roles: its protein stability is controlled by caspase-mediated degradation counterbalanced by CHK1 signaling; it binds temporally regulated RNA cargo during corticogenesis for asymmetric delivery into intermediate progenitor cells; and it is co-opted by influenza NS1 to promote viral mRNA nuclear export and replication.\",\n      \"evidence\": \"BioID proximity proteomics with CRISPR KO and pharmacological inhibitors in RPE1 cells [PMID:33663378]; RIP-seq in embryonic mouse cortex with differentiation assays [PMID:34345913]; AP-MS plus Co-IP and knockdown/overexpression in chicken cells infected with H5N1 [PMID:33968009]\",\n      \"pmids\": [\"33663378\", \"34345913\", \"33968009\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"How CHK1 signaling mechanistically protects STAU2 from caspase cleavage is unresolved\",\n        \"Whether the cortical RNA cargo is directly translated or stabilized in IPCs is unknown\",\n        \"The NS1–STAU2 interaction domain and whether it is conserved in mammalian influenza strains remain undefined\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of RNF216 as an E3 ubiquitin ligase that targets STAU2 for proteasomal degradation established a second post-translational control axis, with RNF216 knockout mice showing elevated STAU2 in the hypothalamus.\",\n      \"evidence\": \"Co-immunoprecipitation, RNF216 knockout mouse model with Western blot quantification\",\n      \"pmids\": [\"37439148\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific ubiquitination sites on STAU2 are not mapped\",\n        \"Functional consequences of elevated STAU2 in the hypothalamus are not characterized\",\n        \"Whether RNF216-mediated degradation is regulated by neuronal activity is unknown\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapping the EV-A71 3Cpro cleavage site to Q507–G508 in STAU2 revealed that viral proteolysis generates a C-terminal fragment (aa 508–570) that retains pro-viral activity, demonstrating a specific viral exploitation mechanism.\",\n      \"evidence\": \"Site-directed mutagenesis of cleavage site, truncation constructs, Co-IP, siRNA/overexpression with viral VP1 readout\",\n      \"pmids\": [\"39272111\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"How the small C-terminal fragment promotes viral replication mechanistically is unknown\",\n        \"Whether other enterovirus 3C proteases also target STAU2 is untested\",\n        \"Single lab study without structural data\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"STAU2 was shown to directly bind PALLD mRNA, regulate PALLD and IQGAP1 expression, and thereby promote EMT and metastasis in pancreatic ductal adenocarcinoma, extending STAU2's functional repertoire to cancer biology.\",\n      \"evidence\": \"RNA immunoprecipitation, ASO knockdown, in vitro migration/invasion assays, in vivo xenograft models in PDAC\",\n      \"pmids\": [\"40539383\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether STAU2 stabilizes or translationally enhances PALLD mRNA is not dissected\",\n        \"The mechanism linking STAU2 to IQGAP1 regulation is indirect and unresolved\",\n        \"Applicability to other cancer types is untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A unified structural and mechanistic understanding of how STAU2's multiple dsRBDs select specific RNA cargo, how post-translational modifications (ubiquitination, caspase cleavage, CHK1-dependent stabilization) are integrated, and how STAU2 coordinates translational control versus mRNA decay in different cellular contexts remains to be established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of STAU2 in complex with RNA cargo\",\n        \"No systematic identification of STAU2 ubiquitination or phosphorylation sites\",\n        \"Relationship between STAU2-UPF1 granule function and Staufen-mediated mRNA decay is unresolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 3, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 3, 4]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"UPF1\",\n      \"RNF216\",\n      \"NS1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"STAU2 is a double-stranded RNA-binding protein that governs mRNA transport, translational control, and cell fate decisions in neuronal and progenitor cells. In hippocampal neurons, STAU2 partners with UPF1 to assemble RNA granules required for dendritic mRNA transport, stalled polysome formation, and mGluR-dependent long-term depression [PMID:28821679]; during corticogenesis, it binds a temporally regulated RNA cargo and is asymmetrically partitioned into intermediate progenitor cells, coupling mRNA localization to neural lineage diversification [PMID:34345913]. STAU2 protein stability is regulated by caspase-mediated cleavage counterbalanced by the CHK1 kinase pathway and by RNF216-dependent ubiquitin–proteasome degradation, and its depletion accelerates cell proliferation, linking STAU2 to cell-cycle control [PMID:33663378, PMID:37439148]. Beyond the nervous system, STAU2 directly binds PALLD mRNA and mediates IQGAP1 signaling to promote epithelial-to-mesenchymal transition and metastasis in pancreatic ductal adenocarcinoma [PMID:40539383].\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Establishing that STAU2 localizes to the meiotic spindle and is required for spindle integrity resolved whether STAU2 has cytoskeletal functions beyond mRNA transport, demonstrating a role in microtubule-kinetochore attachment and spindle assembly checkpoint activation in oocytes.\",\n      \"evidence\": \"Morpholino knockdown with immunofluorescence and drug perturbation of microtubule dynamics in mouse oocytes\",\n      \"pmids\": [\"27433972\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which an RNA-binding protein stabilizes spindle microtubules is unknown\", \"Whether STAU2 acts through local mRNA translation at the spindle or via direct protein-protein interactions is unresolved\", \"Not tested in mitotic cells\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of UPF1 as a functional STAU2 partner established that RNA granule assembly requires UPF1 for dendritic mRNA transport and local translation, and linked this complex to mGluR-LTD, answering how STAU2 granules contribute to synaptic plasticity.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, knockdown, live imaging, and mGluR-LTD electrophysiology in rat hippocampal neurons\",\n      \"pmids\": [\"28821679\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific RNA targets within the granule that mediate LTD are not identified\", \"Whether UPF1's role is catalytic (NMD-related) or structural within the granule is unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating that STAU2 deficiency upregulates GluD2 and alters motor coordination in vivo extended STAU2's role from hippocampal to cerebellar circuits, establishing it as a regulator of Purkinje cell synaptogenesis and motor learning.\",\n      \"evidence\": \"Stau2 gene-trap mouse with immunofluorescence and rotarod/running-wheel behavioral assays\",\n      \"pmids\": [\"30979012\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether STAU2 directly binds GluD2 mRNA or acts indirectly is not determined\", \"Mechanism linking physical activity to STAU2-dependent GluD2 regulation is unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"RIP-seq across cortical development stages and asymmetric division analyses revealed that STAU2 binds a stage-specific RNA cargo and preferentially segregates into intermediate progenitor cells, answering how post-transcriptional regulation contributes to neural progenitor diversification.\",\n      \"evidence\": \"RIP-seq at four developmental stages in mouse cortex with in vitro knockdown of target Taf13\",\n      \"pmids\": [\"34345913\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Only one cargo (Taf13) functionally validated\", \"How STAU2 is asymmetrically localized during division is mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that STAU2 protein levels are governed by opposing caspase-mediated degradation and CHK1-dependent stabilization, and that STAU2 loss accelerates proliferation, revealed a cell-cycle checkpoint role independent of its neuronal functions.\",\n      \"evidence\": \"CRISPR/Cas9 KO and RNAi in hTERT-RPE1 cells, caspase/CHK1 inhibitors, BioID proximity proteomics, proliferation assays\",\n      \"pmids\": [\"33663378\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CHK1 directly phosphorylates STAU2 or acts indirectly is unknown\", \"Specific caspase(s) responsible for STAU2 cleavage not identified\", \"Whether this proliferation phenotype is RNA-binding-dependent remains untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of RNF216 as a ubiquitin E3 ligase that targets STAU2 for proteasomal degradation provided a second post-translational control axis, with in vivo validation showing elevated STAU2 in RNF216 knockout hypothalamus.\",\n      \"evidence\": \"Co-immunoprecipitation and Western blot in RNF216 knockout mice\",\n      \"pmids\": [\"37439148\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination sites on STAU2 not mapped\", \"Functional consequence of elevated STAU2 in hypothalamus not characterized\", \"Relationship between RNF216 and caspase/CHK1 regulatory axes is unexplored\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstration that EV-A71 protease 3C cleaves STAU2 at Q507-G508 and that the C-terminal fragment promotes viral replication revealed how a virus co-opts STAU2's RNA-binding activity, complementing earlier evidence that STAU2 promotes H5N1 replication via NS1 mRNA export.\",\n      \"evidence\": \"Co-IP, site-directed mutagenesis of cleavage site, siRNA knockdown, and overexpression of truncation constructs in EV-A71-infected cells\",\n      \"pmids\": [\"39272111\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How the 63-amino-acid C-terminal fragment promotes replication is mechanistically unclear\", \"Whether cleavage-resistant STAU2 alters viral fitness in vivo is untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Direct binding of STAU2 to PALLD mRNA and in vivo ASO-mediated suppression of PDAC metastasis established STAU2 as a driver of epithelial-to-mesenchymal transition via PALLD/IQGAP1 signaling, extending its functional repertoire to cancer.\",\n      \"evidence\": \"RNA-binding assays, ASO treatment, in vitro and in vivo PDAC tumor models\",\n      \"pmids\": [\"40539383\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether STAU2 stabilizes or translationally activates PALLD mRNA is not distinguished\", \"Generalizability beyond PDAC is untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of STAU2's RNA cargo selectivity, the identity of direct phosphorylation sites mediating CHK1-dependent stabilization, and whether STAU2's meiotic spindle role requires RNA binding or protein-protein interactions remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of STAU2 bound to a specific endogenous RNA target\", \"CHK1 phosphorylation sites on STAU2 not mapped\", \"Mechanistic link between RNA binding and spindle function is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 4, 8, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"complexes\": [\n      \"STAU2–UPF1 RNA granule\"\n    ],\n    \"partners\": [\n      \"UPF1\",\n      \"RNF216\",\n      \"PALLD\",\n      \"IQGAP1\",\n      \"NS1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}