{"gene":"VPS25","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2005,"finding":"Drosophila Vps25, a component of the ESCRT-II machinery, acts as a tumor suppressor; loss of vps25 causes endosomal accumulation of the Notch receptor, leading to enhanced Notch signaling, ectopic production of the JAK-STAT ligand Unpaired, and non-autonomous overproliferation of neighboring wild-type tissue.","method":"Drosophila mosaic genetic analysis, endosomal trafficking assays, epistasis with Notch and JAK-STAT pathway components","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — two independent labs, multiple genetic and cell biological methods, replicated in same issue","pmids":["16256743","16256745"],"is_preprint":false},{"year":2005,"finding":"Drosophila Vps25 loss activates both Notch and Dpp receptor signaling due to endocytic blockage causing receptor accumulation in endosomes; when apoptosis of mutant cells is blocked, tumor-like overgrowths capable of metastasis form.","method":"Drosophila genetics, immunofluorescence, epistasis with apoptosis pathway","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, replicated independently","pmids":["16256745"],"is_preprint":false},{"year":2006,"finding":"In Drosophila vps25 mosaics, non-autonomous increase in Diap1 (inhibitor of apoptosis) suppresses hid-induced apoptosis; autonomous apoptosis in mutant clones involves Hid and JNK; Hippo signaling is increased in vps25 clones and hippo mutants block apoptosis in vps25 clones.","method":"Drosophila genetic screen, epistasis with hid, Hippo pathway, and JNK; immunostaining","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — clean genetic epistasis with multiple pathways, replicated phenotypes","pmids":["16611691"],"is_preprint":false},{"year":2004,"finding":"Crystal structure of VPS25 at 3.1 Å resolution reveals two tandem winged helix (WH) domains per monomer; VPS25 crystallizes as a dimer with no conformational change between unliganded form and VPS25 within the ESCRT-II complex (two VPS25 copies with one each of Vps22 and Vps36).","method":"X-ray crystallography, structural comparison","journal":"BMC structural biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure at 3.1 Å with structural validation","pmids":["15579210"],"is_preprint":false},{"year":2009,"finding":"The second winged helix domain of human ESCRT-II subunit VPS25 directly interacts with the first helix of ESCRT-III subunit VPS20; crystal structure of this complex was determined at 2.0 Å; this interface is critical for cargo sorting in vivo, and ESCRT-II directly activates ESCRT-III-driven vesicle budding and scission in vitro via these structural interactions.","method":"X-ray crystallography (2.0 Å), in vitro reconstitution of budding/scission, mutagenesis, in vivo cargo sorting assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 — crystal structure + in vitro reconstitution + mutagenesis + in vivo validation","pmids":["19686684"],"is_preprint":false},{"year":2005,"finding":"Human EAP20 (the VPS25 ortholog, component of ESCRT-II) directly interacts with CHMP6 (ESCRT-III subunit); this interaction is mediated by the N-terminal basic half of CHMP6 and is required for CHMP6 recruitment to endosomal membranes and cargo sorting.","method":"Co-immunoprecipitation of epitope-tagged proteins, in vitro pull-down with purified recombinant proteins, fluorescence microscopy","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — direct binding confirmed by pull-down with purified proteins + functional assays","pmids":["15511219"],"is_preprint":false},{"year":2005,"finding":"Human ESCRT-II (EAP20/VPS25, EAP30, EAP45) localizes to endosomal membranes in a VPS4-dependent fashion; EAP20 binds the N-terminal half of CHMP6/ESCRT-III; depletion of EAP20 inhibits lysosomal targeting of EGF receptor; HIV-1 release is not reduced by EAP20 depletion, indicating HIV-1 does not use an ESCRT-II-dependent budding pathway.","method":"siRNA knockdown, immunofluorescence, EGF degradation assays, HIV-1 release assays","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 — multiple functional assays with knockdown, functional validation of localization","pmids":["16973552"],"is_preprint":false},{"year":2005,"finding":"Misfolded CFTR (but not native CFTR) preferentially associates with hVps25 (human VPS25) and other ubiquitin-dependent endosomal sorting machinery components (Hrs, STAM-2, TSG101, hVps32), linking ubiquitination of misfolded membrane proteins to lysosomal targeting via the ESCRT machinery.","method":"Co-immunoprecipitation, ubiquitination assays, endosomal trafficking experiments in HEK293 cells","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP/pulldown, single lab, but with functional context","pmids":["15007060"],"is_preprint":false},{"year":2005,"finding":"Human ESCRT-II complex (including hVps25) interacts in mammalian cells; hVps25 together with hVps22 and hVps36 forms a heterotetrameric complex; ESCRT-II is found in both cytoplasm and nucleus, and can be recruited to endosomes upon overexpression of dominant-negative hVps4B; siRNA depletion of mammalian ESCRT-II does not affect EGF degradation, suggesting ESCRT-II may be redundant or cargo-specific in mammals.","method":"Yeast two-hybrid, co-immunoprecipitation, siRNA knockdown, EGF degradation assay, subcellular fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, characterization of complex assembly and function","pmids":["16371348"],"is_preprint":false},{"year":2014,"finding":"Mouse Vps25 (ESCRT-II component) selectively modulates FGF signaling over WNT and BMP signaling in limb development; a hypomorphic Vps25 mutation causes polydactyly due to FGF signaling enhancement and hyperactivation of the FGF-SHH feedback loop; Vps25-mutant MEFs exhibit aberrant FGFR trafficking and degradation without perturbation of SHH signaling.","method":"ENU mutagenesis, Vps25-null mouse generation, receptor trafficking assays in MEFs, signaling pathway analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — in vivo mouse genetics with null and hypomorphic alleles, receptor trafficking assays, pathway specificity demonstrated","pmids":["25373905"],"is_preprint":false},{"year":2018,"finding":"ESCRT-II binds RNA in Xenopus eggs; the VPS25 subunit directly cross-links to RNA and specifically recognizes a polypurine (GA-rich) motif; in vitro reconstitution with purified components confirmed selective Vps25-mediated binding of the polypurine motif, revealing an unexpected RNA-binding function for ESCRT-II.","method":"UV cross-linking, CLIP-Seq, in vitro reconstitution with purified components, immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct UV cross-linking + in vitro reconstitution with purified proteins + CLIP-Seq sequence specificity","pmids":["29903915"],"is_preprint":false},{"year":2011,"finding":"Sprouty 2 (Spry2) binds the ESCRT-II component Eap20 (VPS25 ortholog); Spry2 binding to Eap20 disrupts ESCRT-I interaction with ESCRT-II, providing a mechanism by which HIV-1 Gag bypasses ESCRT-II during viral release.","method":"Co-immunoprecipitation, VLP release assays, siRNA knockdown, expression of Spry2 fragments","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP and functional rescue assays, single lab","pmids":["21543492"],"is_preprint":false},{"year":2021,"finding":"VPS25 knockdown in human glioma cells inhibits proliferation, induces G0/G1 cell cycle arrest by altering p21, CDK2, and cyclin E expression, and promotes apoptosis; these effects are associated with inhibition of JAK-STAT signaling; m6A reader YTHDC1 reduces VPS25 expression and suppresses glioma proliferation.","method":"siRNA knockdown, flow cytometry, transcriptome sequencing, western blotting, m6A modification analysis","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotype and pathway placement, but single lab","pmids":["34863175"],"is_preprint":false},{"year":2025,"finding":"VPS25 knockdown in hippocampal neurons alleviates depression-like behavior in rats by promoting autophagy flux (increased LC3-II/LC3-I ratio) and inhibiting neuronal apoptosis, effects associated with blockade of JAK/STAT signaling.","method":"AAV-mediated VPS25 silencing in vivo, behavioral tests, TUNEL staining, western blotting, flow cytometry","journal":"Brain research bulletin","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo KD with behavioral and molecular phenotypes, but single lab, no reconstitution","pmids":["41448467"],"is_preprint":false},{"year":2025,"finding":"VPS25 knockdown in head and neck squamous cell carcinoma (HNSCC) cells reduces tumor cell proliferation and migration; VPS25 promotes immune evasion by upregulating PVR expression in tumor cells, activating the immunosuppressive PVR-TIGIT signaling axis.","method":"siRNA knockdown in CAL27 cells, single-cell RNA sequencing, spatial transcriptomics, immunohistochemistry","journal":"Biomolecules","confidence":"Medium","confidence_rationale":"Tier 2/3 — KD with defined molecular phenotype and signaling pathway, but single lab","pmids":["40149859"],"is_preprint":false}],"current_model":"VPS25/EAP20 is the ESCRT-II subunit with two tandem winged helix domains that bridges ESCRT-I and ESCRT-III (via its second WH domain interacting with VPS20) to drive ubiquitinated cargo sorting and intralumenal vesicle formation at multivesicular bodies; it also directly binds RNA via a polypurine-recognizing activity, selectively modulates FGF receptor trafficking in vertebrate development, regulates Notch and Dpp signaling as a tumor suppressor in Drosophila, and controls JAK-STAT-dependent cell cycle and apoptosis pathways in mammalian cells."},"narrative":{"teleology":[{"year":2004,"claim":"Determining the atomic structure of VPS25 established that its two tandem winged-helix domains form the building block of ESCRT-II architecture, resolving how two copies of VPS25 integrate into the heterotetrameric ESCRT-II complex.","evidence":"X-ray crystallography at 3.1 Å resolution of isolated VPS25 and comparison with the ESCRT-II holocomplex structure","pmids":["15579210"],"confidence":"High","gaps":["The functional significance of each winged-helix domain was not yet assigned","How VPS25 contacts downstream ESCRT-III was unknown"]},{"year":2005,"claim":"Identification of the direct VPS25–CHMP6/VPS20 interaction established VPS25 as the ESCRT-II subunit responsible for recruiting and activating ESCRT-III, the central mechanistic step in multivesicular body formation.","evidence":"Purified recombinant protein pull-downs, co-immunoprecipitation, siRNA knockdown of EAP20 blocking EGFR lysosomal targeting, and VPS4-dependent endosomal recruitment assays in human cells","pmids":["15511219","16973552","16371348"],"confidence":"High","gaps":["Structural basis of the VPS25–CHMP6 interface was not yet resolved","Whether ESCRT-II is essential or cargo-selective in mammalian cells was debated, as siRNA depletion gave inconsistent effects on EGFR degradation across studies"]},{"year":2005,"claim":"Drosophila genetic studies revealed VPS25 as a tumor suppressor whose loss causes endosomal trapping of Notch and Dpp receptors, activating Notch, JAK-STAT, and Hippo pathways and driving non-autonomous overproliferation and metastatic behavior.","evidence":"Mosaic clonal analysis in Drosophila imaginal discs, epistasis with Notch, JAK-STAT (Unpaired), Hippo, JNK, and apoptosis pathways by two independent groups","pmids":["16256743","16256745","16611691"],"confidence":"High","gaps":["Whether mammalian VPS25 loss produces analogous tumor-suppressive or signaling phenotypes was unknown","The relative contribution of each deregulated pathway to tumor phenotype was not resolved"]},{"year":2009,"claim":"A 2.0 Å crystal structure of the VPS25 WH2–VPS20 complex, combined with in vitro reconstitution of budding/scission, demonstrated that ESCRT-II directly activates ESCRT-III-driven membrane remodeling through VPS25's second winged-helix domain.","evidence":"X-ray crystallography, reconstituted giant unilamellar vesicle budding assay, interface mutagenesis, in vivo cargo sorting in yeast","pmids":["19686684"],"confidence":"High","gaps":["How membrane curvature and lipid composition influence the VPS25-VPS20 activation step was not addressed","Whether auxiliary factors modulate this interface in vivo remained open"]},{"year":2014,"claim":"A hypomorphic mouse VPS25 allele showed that ESCRT-II exhibits receptor-selective trafficking control—specifically modulating FGFR but not WNT or SHH receptor degradation—explaining how partial ESCRT-II dysfunction causes a specific developmental defect (polydactyly) rather than generalized endosomal failure.","evidence":"ENU mutagenesis-derived and null mouse alleles, receptor trafficking and signaling assays in MEFs, limb development phenotyping","pmids":["25373905"],"confidence":"High","gaps":["The molecular determinant that confers FGFR selectivity over other RTKs is unknown","Whether human VPS25 mutations cause analogous developmental phenotypes has not been reported"]},{"year":2018,"claim":"Discovery that VPS25 directly cross-links to RNA and specifically recognizes a polypurine (GA-rich) motif expanded the functional repertoire of ESCRT-II beyond membrane trafficking, suggesting a role in RNA biology.","evidence":"UV cross-linking and CLIP-Seq in Xenopus egg extracts, in vitro reconstitution with purified ESCRT-II components","pmids":["29903915"],"confidence":"High","gaps":["The physiological consequence of VPS25–RNA binding (e.g. RNA localization, stability, or translation) is not established","Whether RNA binding is conserved in mammalian cells and whether it intersects with endosomal trafficking is unknown"]},{"year":2021,"claim":"VPS25 knockdown in human glioma cells demonstrated a pro-proliferative role for VPS25 in cancer, mediated at least partly through JAK-STAT signaling and cell cycle regulators (p21, CDK2, cyclin E), paralleling the JAK-STAT connection first identified in Drosophila.","evidence":"siRNA knockdown, flow cytometry for cell cycle and apoptosis, transcriptome sequencing, western blot in glioma cell lines","pmids":["34863175"],"confidence":"Medium","gaps":["Direct mechanism linking VPS25 to JAK-STAT activation in mammalian cells (receptor identity, ubiquitination status) is not defined","Whether the glioma phenotype depends on ESCRT-II complex integrity or a moonlighting function of VPS25 is unresolved"]},{"year":2025,"claim":"Recent studies extended VPS25's roles to neuronal autophagy and immune evasion: VPS25 knockdown in hippocampal neurons promoted autophagy flux and reduced apoptosis via JAK-STAT inhibition, while in HNSCC cells VPS25 promoted immune evasion through PVR upregulation and TIGIT signaling.","evidence":"AAV-mediated VPS25 silencing in rat hippocampus with behavioral and molecular readouts; siRNA knockdown in CAL27 cells with single-cell and spatial transcriptomics","pmids":["41448467","40149859"],"confidence":"Medium","gaps":["Both studies are from single labs without independent replication","Whether VPS25's effects on autophagy and PVR expression require ESCRT-II complex function or alternative interactions is untested","The direct molecular link between VPS25 and PVR transcriptional regulation is undefined"]},{"year":null,"claim":"Key unresolved questions include: what physiological role VPS25's RNA-binding activity serves; how ESCRT-II achieves receptor-selective trafficking in mammals; and whether VPS25 loss-of-function mutations cause human disease.","evidence":"","pmids":[],"confidence":"High","gaps":["No human Mendelian disease linked to VPS25 mutations has been reported","The structural basis for RNA substrate selectivity by VPS25 is unknown","Comprehensive analysis of cargo selectivity for ESCRT-II in different mammalian tissues is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[10]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,4,5]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,5,6]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,5,6,8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,1,6,7]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1,4,5,6,7,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,9,12,13]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[13]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,2,12,13]}],"complexes":["ESCRT-II"],"partners":["VPS22","VPS36","VPS20","CHMP6","SPRY2"],"other_free_text":[]},"mechanistic_narrative":"VPS25 is a core subunit of the ESCRT-II complex that bridges ESCRT-I to ESCRT-III during multivesicular body biogenesis, functioning through two tandem winged-helix domains, the second of which directly engages the ESCRT-III subunit VPS20/CHMP6 to activate membrane budding and scission required for lysosomal degradation of ubiquitinated cargo such as EGFR and FGFR [PMID:15579210, PMID:19686684, PMID:15511219, PMID:16973552]. In Drosophila, VPS25 acts as a tumor suppressor: its loss causes endosomal accumulation of Notch and Dpp receptors, ectopic activation of Notch, JAK-STAT, and Hippo signaling, and non-autonomous overgrowth that can progress to metastasis when apoptosis is blocked [PMID:16256743, PMID:16256745, PMID:16611691]. VPS25 selectively modulates receptor tyrosine kinase trafficking in vertebrate development, as a hypomorphic mouse allele perturbs FGFR degradation and causes polydactyly without affecting SHH or WNT signaling [PMID:25373905]. Beyond its canonical ESCRT role, VPS25 directly binds RNA through recognition of a polypurine (GA-rich) motif, revealing an additional molecular activity for ESCRT-II [PMID:29903915]."},"prefetch_data":{"uniprot":{"accession":"Q9BRG1","full_name":"Vacuolar protein-sorting-associated protein 25","aliases":["Dermal papilla-derived protein 9","ELL-associated protein of 20 kDa","ESCRT-II complex subunit VPS25"],"length_aa":176,"mass_kda":20.7,"function":"Component of the ESCRT-II complex (endosomal sorting complex required for transport II), which is required for multivesicular body (MVB) formation and sorting of endosomal cargo proteins into MVBs. The MVB pathway mediates delivery of transmembrane proteins into the lumen of the lysosome for degradation. The ESCRT-II complex is probably involved in the recruitment of the ESCRT-III complex. The ESCRT-II complex may also play a role in transcription regulation, possibly via its interaction with ELL. The ESCRT-II complex may be involved in facilitating the budding of certain RNA viruses","subcellular_location":"Cytoplasm; Endosome membrane; Nucleus, nucleoplasm","url":"https://www.uniprot.org/uniprotkb/Q9BRG1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/VPS25","classification":"Common Essential","n_dependent_lines":1206,"n_total_lines":1208,"dependency_fraction":0.9983443708609272},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000131475","cell_line_id":"CID000788","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":3}],"interactors":[{"gene":"SNF8","stoichiometry":10.0},{"gene":"VPS36","stoichiometry":10.0},{"gene":"PMVK","stoichiometry":0.2},{"gene":"VPS37B","stoichiometry":0.2},{"gene":"TSG101","stoichiometry":0.2},{"gene":"VPS28","stoichiometry":0.2},{"gene":"MVB12A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000788","total_profiled":1310},"omim":[{"mim_id":"620784","title":"NEURODEVELOPMENTAL DISORDER PLUS OPTIC ATROPHY; NEDOA","url":"https://www.omim.org/entry/620784"},{"mim_id":"620783","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 115; DEE115","url":"https://www.omim.org/entry/620783"},{"mim_id":"611130","title":"CHARGED MULTIVESICULAR BODY PROTEIN 7; CHMP7","url":"https://www.omim.org/entry/611130"},{"mim_id":"610907","title":"VACUOLAR PROTEIN SORTING 25 HOMOLOG; VPS25","url":"https://www.omim.org/entry/610907"},{"mim_id":"610904","title":"SNF8 SUBUNIT OF ESCRIT-II; SNF8","url":"https://www.omim.org/entry/610904"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Vesicles","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/VPS25"},"hgnc":{"alias_symbol":["MGC10540","EAP20","DERP9"],"prev_symbol":[]},"alphafold":{"accession":"Q9BRG1","domains":[{"cath_id":"1.10.10.570","chopping":"9-98","consensus_level":"high","plddt":94.9079,"start":9,"end":98},{"cath_id":"1.10.10.10","chopping":"103-174","consensus_level":"high","plddt":92.4976,"start":103,"end":174}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BRG1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BRG1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BRG1-F1-predicted_aligned_error_v6.png","plddt_mean":92.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VPS25","jax_strain_url":"https://www.jax.org/strain/search?query=VPS25"},"sequence":{"accession":"Q9BRG1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BRG1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BRG1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BRG1"}},"corpus_meta":[{"pmid":"16256743","id":"PMC_16256743","title":"The 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cell","url":"https://pubmed.ncbi.nlm.nih.gov/19686684","citation_count":103,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":10057,"output_tokens":2506,"usd":0.033881},"stage2":{"model":"claude-opus-4-6","input_tokens":5822,"output_tokens":2380,"usd":0.132915},"total_usd":0.383563,"stage1_batch_id":"msgbatch_01BparvgRZ9S2LMidvaoo86K","stage2_batch_id":"msgbatch_01NkBfv9SVZWthhS7j6mU6G3","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":22066,"output_tokens":3445,"usd":0.058937},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":7099,"output_tokens":2789,"usd":0.15783}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"Drosophila Vps25 (ESCRT-II component) is required for endocytic trafficking and downregulation of the Notch receptor; vps25 mutant cells show endosomal accumulation of Notch and enhanced Notch signaling, leading to ectopic production of the JAK-STAT ligand Unpaired and non-autonomous overproliferation of neighboring wild-type epithelium.\",\n      \"method\": \"Drosophila mosaic genetic analysis (loss-of-function clones), immunofluorescence of endosomal compartments, epistasis with Notch/JAK-STAT pathway components\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated independently by two labs in the same journal issue, multiple orthogonal methods including genetics, imaging, and pathway epistasis\",\n      \"pmids\": [\"16256743\", \"16256745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Drosophila Vps25 loss activates both Notch and Dpp receptor signaling due to endocytic blockage causing receptor accumulation in endosomes; blocking apoptosis in vps25 mutant cells produces metastatic tumor-like overgrowths.\",\n      \"method\": \"Drosophila genetics (mosaic clones, apoptosis inhibition), immunostaining for Notch and Dpp pathway components\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — independent replication, multiple signaling pathways tested, genetic epistasis\",\n      \"pmids\": [\"16256745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In Drosophila vps25 mosaics, non-autonomous inhibition of apoptosis is mediated by elevated Diap1 protein levels in neighboring cells; autonomous apoptosis of vps25 mutant cells involves Hid and JNK; Hippo signaling is increased in vps25 clones and hippo mutation blocks apoptosis in vps25 clones.\",\n      \"method\": \"Drosophila genetic screen, epistasis analysis (hippo, hid, JNK pathways), immunostaining for Diap1\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis across multiple pathways, consistent with and extending prior replication\",\n      \"pmids\": [\"16611691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Crystal structure of VPS25 at 3.1 Å resolution reveals two winged-helix domains arranged in tandem; VPS25 crystallizes as a dimer, and no conformational changes are detected between unliganded VPS25 and VPS25 within the intact ESCRT-II complex (Vps22/Vps36/2×Vps25).\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"BMC structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure determination\",\n      \"pmids\": [\"15579210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human VPS25 ortholog EAP20 directly interacts with the ESCRT-III component CHMP6; this interaction is mediated by the N-terminal basic half of CHMP6, demonstrated by in vitro pull-down with purified recombinant proteins. EAP20 co-expressed with CHMP6 redistributes from diffuse to punctate endosomal localization, supporting EAP20's role as an ESCRT-II component accepting ESCRT-III on endosomal membranes.\",\n      \"method\": \"Co-immunoprecipitation of epitope-tagged proteins in HEK-293 cells, in vitro pull-down with purified recombinant proteins, fluorescence microscopy\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct interaction confirmed by in vitro reconstitution with purified proteins plus cell-based co-IP\",\n      \"pmids\": [\"15511219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Mouse Vps25 (ESCRT-II) selectively promotes endosome-mediated degradation of FGF receptors in limb cells; a hypomorphic Vps25 mutation causes aberrant FGFR trafficking and enhanced FGF signaling leading to polydactyly, while WNT and BMP signaling are unperturbed, establishing context-specific selectivity of ESCRT-II for FGF receptor downregulation.\",\n      \"method\": \"ENU mutagenesis screen, Vps25-null mouse generation, MEF FGFR trafficking assays, immunofluorescence, genetic epistasis with FGF-SHH pathway\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple alleles (null and hypomorph), cell-based trafficking assay, signaling specificity tested across pathways\",\n      \"pmids\": [\"25373905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Xenopus ESCRT-II binds RNA through its subunit Vps25, which specifically recognizes a polypurine (GA-rich) motif; this direct RNA-binding activity was reconstituted in vitro with purified components and the binding motif was identified by CLIP-Seq.\",\n      \"method\": \"UV cross-linking immunoprecipitation (CLIP), CLIP-Seq, in vitro reconstitution with purified Vps25, RNA electrophoretic mobility assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with purified protein plus CLIP-Seq motif identification\",\n      \"pmids\": [\"29903915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sprouty 2 (Spry2) binds the ESCRT-II component EAP20 (human VPS25 ortholog) and disrupts ESCRT-I/ESCRT-II interaction, thereby facilitating HIV-1 Gag VLP release; a Spry2 fragment sufficient to bind EAP20 enhances VLP release when co-expressed with Gag.\",\n      \"method\": \"Co-immunoprecipitation, overexpression/dominant-negative fragment, quantitative VLP release assay in COS-1 cells\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction and functional consequence shown, but single lab\",\n      \"pmids\": [\"21543492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"VPS25 knockdown in human glioma cells blocks cell cycle progression (G0/G1 arrest), reduces CDK2 and cyclin E expression, increases p21, and suppresses JAK-STAT activation; YTHDC1 reduces VPS25 expression via m6A modification to inhibit glioma proliferation.\",\n      \"method\": \"siRNA knockdown, flow cytometry cell cycle analysis, western blotting, transcriptome sequencing, m6A inhibitor experiments\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined cellular phenotype with pathway components measured, but single lab and primarily loss-of-function in cell lines\",\n      \"pmids\": [\"34863175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Evolutionary analysis of Vps25 identified two conserved N-terminal PPXY motifs (motif I: P-[WP]-X-[YF]; motif II: P-P-[FYL]-[FY]) required for Vps25 dimerization and interaction with Vps22 and Vps36 within ESCRT-II; a highly conserved C-terminal lysine suggests Vps25 is ubiquitinated; Arg-83 of yeast Vps25 (involved in Vps22 interaction) is highly conserved.\",\n      \"method\": \"Comparative sequence analysis of 119 orthologs correlated with known yeast Vps25 crystal structure and mutant phenotypes\",\n      \"journal\": \"BMC evolutionary biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational/comparative analysis only, no direct experimental validation of ubiquitination or motif function\",\n      \"pmids\": [\"16889659\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VPS25/EAP20 is a winged-helix subunit of the ESCRT-II complex (two copies per complex alongside Vps22 and Vps36) that mediates endosomal sorting of ubiquitinated transmembrane receptors into multivesicular bodies; it directly contacts ESCRT-III via CHMP6 and bridges ESCRT-I to ESCRT-III, and loss of Vps25 causes endosomal accumulation and hyperactivation of signaling receptors (Notch, Dpp, FGFR), driving autonomous neoplastic transformation and non-autonomous proliferation through JAK-STAT signaling; additionally, Vps25 binds RNA directly through a winged-helix surface recognizing GA-rich motifs, revealing an unexpected link between ESCRT-II and mRNA regulation.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"Drosophila Vps25, a component of the ESCRT-II machinery, acts as a tumor suppressor; loss of vps25 causes endosomal accumulation of the Notch receptor, leading to enhanced Notch signaling, ectopic production of the JAK-STAT ligand Unpaired, and non-autonomous overproliferation of neighboring wild-type tissue.\",\n      \"method\": \"Drosophila mosaic genetic analysis, endosomal trafficking assays, epistasis with Notch and JAK-STAT pathway components\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two independent labs, multiple genetic and cell biological methods, replicated in same issue\",\n      \"pmids\": [\"16256743\", \"16256745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Drosophila Vps25 loss activates both Notch and Dpp receptor signaling due to endocytic blockage causing receptor accumulation in endosomes; when apoptosis of mutant cells is blocked, tumor-like overgrowths capable of metastasis form.\",\n      \"method\": \"Drosophila genetics, immunofluorescence, epistasis with apoptosis pathway\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, replicated independently\",\n      \"pmids\": [\"16256745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In Drosophila vps25 mosaics, non-autonomous increase in Diap1 (inhibitor of apoptosis) suppresses hid-induced apoptosis; autonomous apoptosis in mutant clones involves Hid and JNK; Hippo signaling is increased in vps25 clones and hippo mutants block apoptosis in vps25 clones.\",\n      \"method\": \"Drosophila genetic screen, epistasis with hid, Hippo pathway, and JNK; immunostaining\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic epistasis with multiple pathways, replicated phenotypes\",\n      \"pmids\": [\"16611691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Crystal structure of VPS25 at 3.1 Å resolution reveals two tandem winged helix (WH) domains per monomer; VPS25 crystallizes as a dimer with no conformational change between unliganded form and VPS25 within the ESCRT-II complex (two VPS25 copies with one each of Vps22 and Vps36).\",\n      \"method\": \"X-ray crystallography, structural comparison\",\n      \"journal\": \"BMC structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure at 3.1 Å with structural validation\",\n      \"pmids\": [\"15579210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The second winged helix domain of human ESCRT-II subunit VPS25 directly interacts with the first helix of ESCRT-III subunit VPS20; crystal structure of this complex was determined at 2.0 Å; this interface is critical for cargo sorting in vivo, and ESCRT-II directly activates ESCRT-III-driven vesicle budding and scission in vitro via these structural interactions.\",\n      \"method\": \"X-ray crystallography (2.0 Å), in vitro reconstitution of budding/scission, mutagenesis, in vivo cargo sorting assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure + in vitro reconstitution + mutagenesis + in vivo validation\",\n      \"pmids\": [\"19686684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human EAP20 (the VPS25 ortholog, component of ESCRT-II) directly interacts with CHMP6 (ESCRT-III subunit); this interaction is mediated by the N-terminal basic half of CHMP6 and is required for CHMP6 recruitment to endosomal membranes and cargo sorting.\",\n      \"method\": \"Co-immunoprecipitation of epitope-tagged proteins, in vitro pull-down with purified recombinant proteins, fluorescence microscopy\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding confirmed by pull-down with purified proteins + functional assays\",\n      \"pmids\": [\"15511219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human ESCRT-II (EAP20/VPS25, EAP30, EAP45) localizes to endosomal membranes in a VPS4-dependent fashion; EAP20 binds the N-terminal half of CHMP6/ESCRT-III; depletion of EAP20 inhibits lysosomal targeting of EGF receptor; HIV-1 release is not reduced by EAP20 depletion, indicating HIV-1 does not use an ESCRT-II-dependent budding pathway.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, EGF degradation assays, HIV-1 release assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays with knockdown, functional validation of localization\",\n      \"pmids\": [\"16973552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Misfolded CFTR (but not native CFTR) preferentially associates with hVps25 (human VPS25) and other ubiquitin-dependent endosomal sorting machinery components (Hrs, STAM-2, TSG101, hVps32), linking ubiquitination of misfolded membrane proteins to lysosomal targeting via the ESCRT machinery.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, endosomal trafficking experiments in HEK293 cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP/pulldown, single lab, but with functional context\",\n      \"pmids\": [\"15007060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human ESCRT-II complex (including hVps25) interacts in mammalian cells; hVps25 together with hVps22 and hVps36 forms a heterotetrameric complex; ESCRT-II is found in both cytoplasm and nucleus, and can be recruited to endosomes upon overexpression of dominant-negative hVps4B; siRNA depletion of mammalian ESCRT-II does not affect EGF degradation, suggesting ESCRT-II may be redundant or cargo-specific in mammals.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, siRNA knockdown, EGF degradation assay, subcellular fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, characterization of complex assembly and function\",\n      \"pmids\": [\"16371348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Mouse Vps25 (ESCRT-II component) selectively modulates FGF signaling over WNT and BMP signaling in limb development; a hypomorphic Vps25 mutation causes polydactyly due to FGF signaling enhancement and hyperactivation of the FGF-SHH feedback loop; Vps25-mutant MEFs exhibit aberrant FGFR trafficking and degradation without perturbation of SHH signaling.\",\n      \"method\": \"ENU mutagenesis, Vps25-null mouse generation, receptor trafficking assays in MEFs, signaling pathway analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse genetics with null and hypomorphic alleles, receptor trafficking assays, pathway specificity demonstrated\",\n      \"pmids\": [\"25373905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ESCRT-II binds RNA in Xenopus eggs; the VPS25 subunit directly cross-links to RNA and specifically recognizes a polypurine (GA-rich) motif; in vitro reconstitution with purified components confirmed selective Vps25-mediated binding of the polypurine motif, revealing an unexpected RNA-binding function for ESCRT-II.\",\n      \"method\": \"UV cross-linking, CLIP-Seq, in vitro reconstitution with purified components, immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct UV cross-linking + in vitro reconstitution with purified proteins + CLIP-Seq sequence specificity\",\n      \"pmids\": [\"29903915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sprouty 2 (Spry2) binds the ESCRT-II component Eap20 (VPS25 ortholog); Spry2 binding to Eap20 disrupts ESCRT-I interaction with ESCRT-II, providing a mechanism by which HIV-1 Gag bypasses ESCRT-II during viral release.\",\n      \"method\": \"Co-immunoprecipitation, VLP release assays, siRNA knockdown, expression of Spry2 fragments\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP and functional rescue assays, single lab\",\n      \"pmids\": [\"21543492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"VPS25 knockdown in human glioma cells inhibits proliferation, induces G0/G1 cell cycle arrest by altering p21, CDK2, and cyclin E expression, and promotes apoptosis; these effects are associated with inhibition of JAK-STAT signaling; m6A reader YTHDC1 reduces VPS25 expression and suppresses glioma proliferation.\",\n      \"method\": \"siRNA knockdown, flow cytometry, transcriptome sequencing, western blotting, m6A modification analysis\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype and pathway placement, but single lab\",\n      \"pmids\": [\"34863175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"VPS25 knockdown in hippocampal neurons alleviates depression-like behavior in rats by promoting autophagy flux (increased LC3-II/LC3-I ratio) and inhibiting neuronal apoptosis, effects associated with blockade of JAK/STAT signaling.\",\n      \"method\": \"AAV-mediated VPS25 silencing in vivo, behavioral tests, TUNEL staining, western blotting, flow cytometry\",\n      \"journal\": \"Brain research bulletin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KD with behavioral and molecular phenotypes, but single lab, no reconstitution\",\n      \"pmids\": [\"41448467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"VPS25 knockdown in head and neck squamous cell carcinoma (HNSCC) cells reduces tumor cell proliferation and migration; VPS25 promotes immune evasion by upregulating PVR expression in tumor cells, activating the immunosuppressive PVR-TIGIT signaling axis.\",\n      \"method\": \"siRNA knockdown in CAL27 cells, single-cell RNA sequencing, spatial transcriptomics, immunohistochemistry\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — KD with defined molecular phenotype and signaling pathway, but single lab\",\n      \"pmids\": [\"40149859\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VPS25/EAP20 is the ESCRT-II subunit with two tandem winged helix domains that bridges ESCRT-I and ESCRT-III (via its second WH domain interacting with VPS20) to drive ubiquitinated cargo sorting and intralumenal vesicle formation at multivesicular bodies; it also directly binds RNA via a polypurine-recognizing activity, selectively modulates FGF receptor trafficking in vertebrate development, regulates Notch and Dpp signaling as a tumor suppressor in Drosophila, and controls JAK-STAT-dependent cell cycle and apoptosis pathways in mammalian cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"VPS25 (also called EAP20) is a core subunit of the ESCRT-II complex that mediates endosomal sorting of ubiquitinated transmembrane receptors into multivesicular bodies, thereby controlling the downregulation of signaling receptors including Notch, Dpp, and FGF receptors [PMID:16256743, PMID:16256745, PMID:25373905]. Structurally, VPS25 comprises two tandem winged-helix domains and is present in two copies per ESCRT-II complex alongside Vps22 and Vps36; it directly bridges ESCRT-II to ESCRT-III by binding the ESCRT-III component CHMP6 [PMID:15579210, PMID:15511219]. Loss of Vps25 causes endosomal accumulation and hyperactivation of receptors, driving autonomous neoplastic transformation and non-autonomous overproliferation through ectopic JAK-STAT ligand production, with cell survival regulated by Hippo and JNK pathways [PMID:16256743, PMID:16611691]. VPS25 also directly binds RNA through its winged-helix domain, recognizing GA-rich polypurine motifs, establishing an unexpected link between ESCRT-II and mRNA regulation [PMID:29903915].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Determining VPS25's atomic structure revealed an unusual tandem winged-helix architecture and showed that VPS25 does not undergo conformational rearrangement upon ESCRT-II assembly, establishing the structural framework for understanding its interactions.\",\n      \"evidence\": \"X-ray crystallography of VPS25 at 3.1 Å resolution, comparison of free and ESCRT-II-bound forms\",\n      \"pmids\": [\"15579210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No mutagenesis of individual winged-helix domains to assign function\", \"Dimerization interface seen in crystal packing not validated in solution\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of VPS25/EAP20 as the direct binding partner for the ESCRT-III component CHMP6 established how ESCRT-II hands off cargo to ESCRT-III on endosomal membranes.\",\n      \"evidence\": \"In vitro pull-down with purified recombinant proteins, co-IP in HEK-293 cells, fluorescence colocalization\",\n      \"pmids\": [\"15511219\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding surface on VPS25 not mapped at residue resolution\", \"Whether both copies of VPS25 in ESCRT-II simultaneously engage CHMP6 is unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Genetic studies in Drosophila demonstrated that Vps25 is required for endocytic downregulation of Notch and Dpp receptors, and that loss of Vps25 causes endosomal receptor accumulation leading to hyperactive signaling, non-autonomous proliferation via JAK-STAT, and neoplastic transformation.\",\n      \"evidence\": \"Drosophila mosaic clonal analysis, immunofluorescence of endosomal compartments, epistasis with Notch/JAK-STAT/Dpp pathway components (two independent labs)\",\n      \"pmids\": [\"16256743\", \"16256745\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which endosomal trapping enhances rather than diminishes signaling not fully resolved\", \"Whether Vps25 acts identically on all receptor types or shows selectivity was unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mechanistic dissection of cell survival in vps25 mosaics revealed that autonomous apoptosis requires Hid/JNK and Hippo signaling, while non-autonomous anti-apoptotic effects operate through elevated Diap1, explaining how vps25 mutant tissue generates tumor-like overgrowths when apoptosis is blocked.\",\n      \"evidence\": \"Drosophila genetic epistasis with hippo, hid, JNK pathway mutants; Diap1 immunostaining\",\n      \"pmids\": [\"16611691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets of Hippo that mediate apoptosis in vps25 clones not identified\", \"How Diap1 is upregulated non-autonomously not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Discovery that Sprouty2 binds EAP20/VPS25 and disrupts the ESCRT-I/ESCRT-II interface revealed a host factor mechanism for modulating ESCRT function, exploited by HIV-1 Gag during viral budding.\",\n      \"evidence\": \"Co-immunoprecipitation, dominant-negative fragment expression, quantitative VLP release assay in COS-1 cells\",\n      \"pmids\": [\"21543492\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding interface between Spry2 and EAP20 not structurally resolved\", \"Physiological relevance of Spry2-ESCRT-II interaction outside HIV budding not tested\", \"Not independently replicated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"A mouse hypomorphic Vps25 mutation demonstrated that ESCRT-II exhibits context-specific receptor selectivity, preferentially degrading FGF receptors while leaving WNT and BMP receptor trafficking intact, connecting Vps25 to limb patterning through FGF-SHH signaling.\",\n      \"evidence\": \"ENU mutagenesis, Vps25-null mouse, MEF FGFR trafficking assays, epistasis with FGF-SHH pathway\",\n      \"pmids\": [\"25373905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for selectivity of ESCRT-II toward FGFR versus other receptors unknown\", \"Whether polydactyly phenotype is fully attributable to FGFR or involves additional substrates not excluded\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"In vitro reconstitution and CLIP-Seq revealed that VPS25 directly binds RNA through its winged-helix domain with specificity for GA-rich motifs, establishing a non-canonical function for ESCRT-II beyond membrane trafficking.\",\n      \"evidence\": \"UV-CLIP, CLIP-Seq in Xenopus, in vitro RNA EMSA with purified Vps25\",\n      \"pmids\": [\"29903915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of VPS25 RNA binding on mRNA fate (stability, localization, translation) not determined\", \"Whether RNA binding and CHMP6 binding are mutually exclusive not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"VPS25 knockdown in glioma cells arrests the cell cycle at G0/G1 with reduced CDK2/cyclin E and increased p21, linking VPS25 expression level to proliferative control and identifying YTHDC1-mediated m6A modification as a regulatory input on VPS25 mRNA.\",\n      \"evidence\": \"siRNA knockdown in human glioma lines, flow cytometry, western blotting, m6A inhibitor experiments\",\n      \"pmids\": [\"34863175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether cell cycle arrest is a direct consequence of impaired receptor degradation or an independent VPS25 function is unclear\", \"Single cell-line system; generalizability not established\", \"YTHDC1-VPS25 regulatory axis not validated in non-cancer context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for VPS25's receptor selectivity (e.g., FGFR vs. other RTKs), the functional consequences of its RNA-binding activity, and whether its roles in RNA regulation and endosomal sorting are coordinated or independent remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of VPS25-CHMP6 interface at atomic resolution\", \"RNA-binding function not linked to any specific cellular outcome\", \"No systematic identification of VPS25-dependent cargo in mammalian cells\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 1, 4, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 4, 5]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\n      \"ESCRT-II\"\n    ],\n    \"partners\": [\n      \"VPS22\",\n      \"VPS36\",\n      \"CHMP6\",\n      \"SPRY2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"VPS25 is a core subunit of the ESCRT-II complex that bridges ESCRT-I to ESCRT-III during multivesicular body biogenesis, functioning through two tandem winged-helix domains, the second of which directly engages the ESCRT-III subunit VPS20/CHMP6 to activate membrane budding and scission required for lysosomal degradation of ubiquitinated cargo such as EGFR and FGFR [PMID:15579210, PMID:19686684, PMID:15511219, PMID:16973552]. In Drosophila, VPS25 acts as a tumor suppressor: its loss causes endosomal accumulation of Notch and Dpp receptors, ectopic activation of Notch, JAK-STAT, and Hippo signaling, and non-autonomous overgrowth that can progress to metastasis when apoptosis is blocked [PMID:16256743, PMID:16256745, PMID:16611691]. VPS25 selectively modulates receptor tyrosine kinase trafficking in vertebrate development, as a hypomorphic mouse allele perturbs FGFR degradation and causes polydactyly without affecting SHH or WNT signaling [PMID:25373905]. Beyond its canonical ESCRT role, VPS25 directly binds RNA through recognition of a polypurine (GA-rich) motif, revealing an additional molecular activity for ESCRT-II [PMID:29903915].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Determining the atomic structure of VPS25 established that its two tandem winged-helix domains form the building block of ESCRT-II architecture, resolving how two copies of VPS25 integrate into the heterotetrameric ESCRT-II complex.\",\n      \"evidence\": \"X-ray crystallography at 3.1 Å resolution of isolated VPS25 and comparison with the ESCRT-II holocomplex structure\",\n      \"pmids\": [\"15579210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The functional significance of each winged-helix domain was not yet assigned\",\n        \"How VPS25 contacts downstream ESCRT-III was unknown\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of the direct VPS25–CHMP6/VPS20 interaction established VPS25 as the ESCRT-II subunit responsible for recruiting and activating ESCRT-III, the central mechanistic step in multivesicular body formation.\",\n      \"evidence\": \"Purified recombinant protein pull-downs, co-immunoprecipitation, siRNA knockdown of EAP20 blocking EGFR lysosomal targeting, and VPS4-dependent endosomal recruitment assays in human cells\",\n      \"pmids\": [\"15511219\", \"16973552\", \"16371348\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of the VPS25–CHMP6 interface was not yet resolved\",\n        \"Whether ESCRT-II is essential or cargo-selective in mammalian cells was debated, as siRNA depletion gave inconsistent effects on EGFR degradation across studies\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Drosophila genetic studies revealed VPS25 as a tumor suppressor whose loss causes endosomal trapping of Notch and Dpp receptors, activating Notch, JAK-STAT, and Hippo pathways and driving non-autonomous overproliferation and metastatic behavior.\",\n      \"evidence\": \"Mosaic clonal analysis in Drosophila imaginal discs, epistasis with Notch, JAK-STAT (Unpaired), Hippo, JNK, and apoptosis pathways by two independent groups\",\n      \"pmids\": [\"16256743\", \"16256745\", \"16611691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether mammalian VPS25 loss produces analogous tumor-suppressive or signaling phenotypes was unknown\",\n        \"The relative contribution of each deregulated pathway to tumor phenotype was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"A 2.0 Å crystal structure of the VPS25 WH2–VPS20 complex, combined with in vitro reconstitution of budding/scission, demonstrated that ESCRT-II directly activates ESCRT-III-driven membrane remodeling through VPS25's second winged-helix domain.\",\n      \"evidence\": \"X-ray crystallography, reconstituted giant unilamellar vesicle budding assay, interface mutagenesis, in vivo cargo sorting in yeast\",\n      \"pmids\": [\"19686684\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How membrane curvature and lipid composition influence the VPS25-VPS20 activation step was not addressed\",\n        \"Whether auxiliary factors modulate this interface in vivo remained open\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"A hypomorphic mouse VPS25 allele showed that ESCRT-II exhibits receptor-selective trafficking control—specifically modulating FGFR but not WNT or SHH receptor degradation—explaining how partial ESCRT-II dysfunction causes a specific developmental defect (polydactyly) rather than generalized endosomal failure.\",\n      \"evidence\": \"ENU mutagenesis-derived and null mouse alleles, receptor trafficking and signaling assays in MEFs, limb development phenotyping\",\n      \"pmids\": [\"25373905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The molecular determinant that confers FGFR selectivity over other RTKs is unknown\",\n        \"Whether human VPS25 mutations cause analogous developmental phenotypes has not been reported\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovery that VPS25 directly cross-links to RNA and specifically recognizes a polypurine (GA-rich) motif expanded the functional repertoire of ESCRT-II beyond membrane trafficking, suggesting a role in RNA biology.\",\n      \"evidence\": \"UV cross-linking and CLIP-Seq in Xenopus egg extracts, in vitro reconstitution with purified ESCRT-II components\",\n      \"pmids\": [\"29903915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The physiological consequence of VPS25–RNA binding (e.g. RNA localization, stability, or translation) is not established\",\n        \"Whether RNA binding is conserved in mammalian cells and whether it intersects with endosomal trafficking is unknown\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"VPS25 knockdown in human glioma cells demonstrated a pro-proliferative role for VPS25 in cancer, mediated at least partly through JAK-STAT signaling and cell cycle regulators (p21, CDK2, cyclin E), paralleling the JAK-STAT connection first identified in Drosophila.\",\n      \"evidence\": \"siRNA knockdown, flow cytometry for cell cycle and apoptosis, transcriptome sequencing, western blot in glioma cell lines\",\n      \"pmids\": [\"34863175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct mechanism linking VPS25 to JAK-STAT activation in mammalian cells (receptor identity, ubiquitination status) is not defined\",\n        \"Whether the glioma phenotype depends on ESCRT-II complex integrity or a moonlighting function of VPS25 is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Recent studies extended VPS25's roles to neuronal autophagy and immune evasion: VPS25 knockdown in hippocampal neurons promoted autophagy flux and reduced apoptosis via JAK-STAT inhibition, while in HNSCC cells VPS25 promoted immune evasion through PVR upregulation and TIGIT signaling.\",\n      \"evidence\": \"AAV-mediated VPS25 silencing in rat hippocampus with behavioral and molecular readouts; siRNA knockdown in CAL27 cells with single-cell and spatial transcriptomics\",\n      \"pmids\": [\"41448467\", \"40149859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Both studies are from single labs without independent replication\",\n        \"Whether VPS25's effects on autophagy and PVR expression require ESCRT-II complex function or alternative interactions is untested\",\n        \"The direct molecular link between VPS25 and PVR transcriptional regulation is undefined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: what physiological role VPS25's RNA-binding activity serves; how ESCRT-II achieves receptor-selective trafficking in mammals; and whether VPS25 loss-of-function mutations cause human disease.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No human Mendelian disease linked to VPS25 mutations has been reported\",\n        \"The structural basis for RNA substrate selectivity by VPS25 is unknown\",\n        \"Comprehensive analysis of cargo selectivity for ESCRT-II in different mammalian tissues is lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 4, 5]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 5, 6, 8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 1, 6, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 4, 5, 6, 7, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 9, 12, 13]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 2, 12, 13]}\n    ],\n    \"complexes\": [\n      \"ESCRT-II\"\n    ],\n    \"partners\": [\n      \"VPS22\",\n      \"VPS36\",\n      \"VPS20\",\n      \"CHMP6\",\n      \"SPRY2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}