{"gene":"EPG5","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2016,"finding":"EPG5 is a Rab7 effector recruited to late endosomes/lysosomes by direct interaction with Rab7 and the late endosomal/lysosomal R-SNARE VAMP7/8. EPG5 also binds LC3/LGG-1 and assembled STX17-SNAP29 Qabc SNARE complexes on autophagosomes, stabilizes and facilitates assembly of STX17-SNAP29-VAMP7/8 trans-SNARE complexes, and promotes STX17-SNAP29-VAMP7-mediated fusion of reconstituted proteoliposomes. Loss of EPG5 causes abnormal fusion of autophagosomes with various endocytic vesicles partly due to elevated STX17-SNAP25-VAMP8 complex assembly.","method":"Co-immunoprecipitation, pulldown assays, reconstituted proteoliposome fusion assay, C. elegans and mammalian loss-of-function genetics, SNARE complex assembly assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro fusion assay combined with multiple binding assays, mutagenesis context, and genetic epistasis across two organisms","pmids":["27588602"],"is_preprint":false},{"year":2012,"finding":"Loss-of-function mutations in EPG5 cause a severe block in autophagosomal clearance, resulting in accumulation of autophagic cargo in autophagosomes, establishing EPG5 as a key regulator of autolysosome formation.","method":"Exome sequencing of patient cohort; autophagosome clearance assay in patient muscle and fibroblasts (immunofluorescence, western blot for autophagy markers)","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated across multiple patient-derived cell types, multiple orthogonal methods, independently confirmed by subsequent studies","pmids":["23222957"],"is_preprint":false},{"year":2013,"finding":"Epg5 deficiency in mice blocks maturation of autophagosomes into degradative autolysosomes and also impairs endocytic trafficking and endocytic recycling, leading to selective degeneration of cortical layer 5 pyramidal neurons and spinal cord motor neurons.","method":"Epg5 knockout mouse model; autophagic flux assays, endocytic trafficking assays, immunohistochemistry, electron microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout model with multiple orthogonal cellular assays replicated across labs","pmids":["23479740","23674064"],"is_preprint":false},{"year":2021,"finding":"Human EPG5 adopts an extended 'shepherd's staff' architecture and binds preferentially to members of the GABARAP subfamily of ATG8 proteins via tandem LIR motifs that exhibit differential affinities; LIR-GABARAP interaction is required for EPG5 recruitment to mitochondria during PINK1/Parkin-dependent mitophagy.","method":"Cryo-EM structure, biochemical binding assays, mitophagy recruitment experiments (live imaging/fractionation)","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure combined with biochemical binding assays and functional mitophagy recruitment, single lab but multiple orthogonal methods","pmids":["33674710"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structure of human EPG5 reveals helical bundles analogous to membrane tethering factors with a unique protruding thumb domain adjacent to tandem LIR motifs. NMR, molecular dynamics, and AlphaFold modeling show tandem LIR motifs bind only the canonical LIR docking site (LDS) on GABARAP without multivalent engagement; co-IP confirmed full-length EPG5-GABARAP interaction is mediated primarily by LIR1. The same binding mode is conserved in C. elegans EPG-5 with LGG-1 and LGG-2 (X-ray crystallography).","method":"Cryo-EM, NMR spectroscopy, molecular dynamics simulations, AlphaFold2 modeling, co-immunoprecipitation, X-ray crystallography, ITC affinity measurements, GST pulldown","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple structural methods (cryo-EM, X-ray, NMR) combined with biochemical validation in single rigorous study","pmids":["39809444"],"is_preprint":false},{"year":2019,"finding":"The deubiquitinating enzyme USP8 binds to the coiled-coil domain of EPG5 and removes K63-linked ubiquitin chains from EPG5 at Lysine 252, leading to enhanced interaction between EPG5 and LC3, thereby maintaining autophagic flux in embryonic stem cells.","method":"Co-immunoprecipitation, ubiquitination assays, site-directed mutagenesis (K252), LC3 interaction assays, ESC autophagy flux assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, mutagenesis at specific lysine, functional autophagic flux assay, multiple orthogonal methods in one study","pmids":["30931944"],"is_preprint":false},{"year":2022,"finding":"TGM2 binds SDC1 and transports it from the cell membrane to lysosomes after irradiation; TGM2 then binds LC3 through two LIR motifs, coordinating autophagosome-lysosome encounter as a prerequisite for lysosomal EPG5 to recognize LC3 and stabilize the STX17-SNAP29-VAMP8 SNARE complex assembly.","method":"Tandem mass tag proteomics, knockdown experiments, co-immunoprecipitation, autophagic flux assays (GFP-RFP-LC3), in vivo GBM mouse model","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods but mechanistic placement of EPG5 is partially inferred from upstream TGM2/SDC1 knockdown data; single lab","pmids":["35913916"],"is_preprint":false},{"year":2018,"finding":"EPG5 is indispensable for transport of the TLR9 ligand CpG to the late endosomal-lysosomal compartment and for TLR9-initiated signaling essential for survival of human memory B cells and their differentiation into plasma cells.","method":"Loss-of-function analysis in Vici syndrome patient cells; CpG trafficking assays, TLR9 signaling assays, B cell survival/differentiation assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived cell loss-of-function with functional readouts, single lab","pmids":["29130391"],"is_preprint":false},{"year":2021,"finding":"During sepsis, EPG5-LC3 protein-protein interactions are significantly reduced in platelets via TLR4/LPS-dependent signaling, impairing autophagosome-lysosome fusion and causing accumulation of autophagosomes.","method":"Co-immunoprecipitation from septic patient platelets, proximity ligation assay, TEM, megakaryocyte model with LPS/TLR4 manipulation","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and PLA from patient samples plus mechanistic megakaryocyte model, single lab, two orthogonal interaction methods","pmids":["34689707"],"is_preprint":false},{"year":2022,"finding":"EPG5 knockout blocks autophagic flux in granulosa cells, causing accumulation of WT1 transcription factor that would normally be degraded by autophagy; failure to degrade WT1 in antral follicular stage reduces steroidogenesis-related gene expression and disrupts granulosa cell differentiation, leading to primary ovarian insufficiency.","method":"Epg5 knockout mouse, single-cell RNA sequencing, autophagic flux assays, cycloheximide chase for WT1 stability, co-IP/interaction assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockout with cellular mechanism defined by scRNA-seq and protein stability assays, single lab","pmids":["35786405"],"is_preprint":false},{"year":2016,"finding":"Epg5 plays a role in lung macrophage physiology to limit innate immune inflammation; deletion of Epg5 leads to elevated baseline innate immune cellular and cytokine-based lung inflammation, as confirmed by bone marrow transplantation experiments showing the phenotype is macrophage-intrinsic.","method":"Epg5 knockout mouse, bone marrow transplantation, lung transcriptomics, cellular cytokine expression analysis","journal":"Cell host & microbe","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bone marrow transplantation cell-type specificity experiments plus transcriptomics, single lab","pmids":["26764600"],"is_preprint":false},{"year":2025,"finding":"In C. elegans, EPG-5 modulates TGFB/TGF-β and WNT signaling by controlling retrograde endocytic trafficking; in epg-5 mutants, TGFB receptor SMA-6 and WNT secretion factor MIG-14 are trapped in hybrid endosomal structures. EPG-5 loss causes defective RAB-5/RAB-7 and RAB-5/RAB-10 conversion leading to hybrid vesicle formation; defects are ameliorated by knockdown of HOPS complex components.","method":"C. elegans genetics, fluorescence microscopy of trafficking reporters, epistasis with HOPS complex knockdown, RAB conversion assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis and live imaging in C. elegans ortholog, single lab, multiple cargo readouts","pmids":["40152605"],"is_preprint":false},{"year":2025,"finding":"In Drosophila fat cells, pre-fusion autophagosomes move toward the non-centrosomal MTOC via a dynein-dynactin complex regulated by Rab7 and its adaptor Epg5 (together with Rab39/ema); Epg5 loss-of-function impairs this MTOC-directed movement and reduces autophagosome-lysosome fusion efficiency.","method":"Loss-of-function genetic screen in Drosophila, live imaging of autophagosome positioning, motor manipulation experiments","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Drosophila ortholog genetic screen with live imaging and functional fusion readout, single lab","pmids":["41147582"],"is_preprint":false},{"year":2026,"finding":"In EPG5-deficient patient-derived fibroblasts and iPSC-derived cortical neurons, impaired mitophagy leads to mitochondrial bioenergetic dysfunction; physiological Ca2+ signals cause mitochondrial Ca2+ overload (attributed to MICU1 downregulation), mitochondrial depolarization, mtDNA release, and activation of the cGAS-STING innate immune pathway. These effects are reversed by inhibition of the mitochondrial permeability transition pore or the STING pathway.","method":"Patient-derived fibroblasts, iPSC-derived cortical neurons, mitophagy assays, mitochondrial membrane potential measurement, Ca2+ imaging, cGAS-STING pathway activation assays, pharmacological inhibition","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived cells with multiple orthogonal mechanistic assays and pharmacological rescue, single lab","pmids":["42191733"],"is_preprint":false},{"year":2025,"finding":"EPG5 deficiency in mice leads to progressive dopaminergic neurodegeneration in the substantia nigra, and patient-derived fibroblasts show defects in PINK1-Parkin-dependent mitophagic clearance and α-synuclein overexpression, linking EPG5 to a cellular basis for parkinsonism.","method":"EPG5-deficient mouse model, patient-derived fibroblast mitophagy assays, α-synuclein immunostaining, PINK1-Parkin pathway assays","journal":"Annals of neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model combined with patient fibroblast mechanistic assays, single lab","pmids":["40192014"],"is_preprint":false},{"year":2024,"finding":"Proteotoxic stress due to impaired autophagic clearance from EPG5 loss correlates with and co-regulates seizure-like behaviors in Drosophila; the epileptogenesis is a direct consequence of proteotoxic stress and age-dependent neurodegeneration rather than an independent pathway.","method":"Drosophila epg5 loss-of-function, electrocorticography, behavioral seizure assays (DART), proteotoxic stress markers, correlation analysis","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Drosophila genetics with electrophysiological and behavioral readouts, single lab","pmids":["39342484"],"is_preprint":false},{"year":2019,"finding":"miR-150 directly represses EPG5, blocking autophagosome-lysosome fusion; EPG5 knockdown promotes NSCLC cell proliferation and recapitulates miR-150 overexpression effects, placing EPG5 downstream of c-myc/miR-150 in regulating autophagic flux.","method":"miR-150 target validation (luciferase reporter, EPG5 protein level), EPG5 knockdown, autophagic flux assays (GFP-LC3), in vitro and in vivo tumor growth assays","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct target validation with reporter assay and functional knockdown rescue, single lab","pmids":["31410206"],"is_preprint":false},{"year":2016,"finding":"Epg5-deficient mice show accumulation of ubiquitin-positive inclusions and SQSTM1 aggregates in retinal cells with impaired autophagosome maturation, leading to unfolded protein response (UPR) activation and elevated DDIT3/CHOP and cleaved CASP3, resulting in apoptotic photoreceptor cell death recapitulating retinitis pigmentosa.","method":"Epg5 knockout mouse, immunofluorescence, western blot (UPR markers), photoreceptor function tests (ERG), cell counting in outer nuclear layer","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vivo knockout with defined molecular mechanism but limited to single lab","pmids":["27715390"],"is_preprint":false}],"current_model":"EPG5 is a metazoan-specific autophagy tethering factor that adopts an extended helical 'shepherd's staff' architecture; it is recruited to late endosomes/lysosomes via direct binding to Rab7 and VAMP7/8, simultaneously engages autophagosomes through tandem LIR motifs that preferentially bind GABARAP-subfamily ATG8 proteins, and enforces fusion specificity by stabilizing and facilitating assembly of STX17-SNAP29-VAMP7/8 trans-SNARE complexes—a function modulated upstream by USP8-mediated K63-deubiquitination at Lys252 that enhances EPG5-LC3 interaction. Beyond canonical autophagy, EPG5 regulates retrograde endocytic trafficking of signaling receptors, controls TLR9 ligand routing to late endosomes for innate/adaptive immune signaling, and positions autophagosomes toward the MTOC via a Rab7-dynein axis; its loss leads to mitochondrial bioenergetic dysfunction, Ca2+-driven mtDNA release, cGAS-STING activation, proteotoxic stress, and selective neurodegeneration, collectively explaining the multisystem pathology of Vici syndrome."},"narrative":{"mechanistic_narrative":"EPG5 is a metazoan autophagy tethering factor that enforces the specificity of autophagosome–lysosome fusion during the terminal, degradative step of autophagy [PMID:27588602, PMID:23222957]. Functioning as a Rab7 effector, it is recruited to late endosomes/lysosomes through direct binding to Rab7 and the R-SNARE VAMP7/8, while simultaneously engaging autophagosomes by binding LC3 and assembled STX17–SNAP29 SNARE complexes; in this position it stabilizes and promotes assembly of STX17–SNAP29–VAMP7/8 trans-SNARE complexes and drives fusion of reconstituted proteoliposomes, with its loss permitting aberrant fusion of autophagosomes with non-autolysosomal endocytic vesicles [PMID:27588602]. Structurally, EPG5 adopts an extended helical 'shepherd's staff' architecture and recognizes ATG8 proteins through tandem LIR motifs that preferentially bind the GABARAP subfamily via the canonical LIR docking site, an interaction required for its recruitment to mitochondria during PINK1/Parkin-dependent mitophagy [PMID:33674710, PMID:39809444]. The EPG5–LC3 interaction is itself regulated: USP8 binds the EPG5 coiled-coil domain and removes K63-linked ubiquitin at Lys252 to enhance LC3 binding and sustain autophagic flux [PMID:30931944]. Beyond canonical degradation, EPG5 controls retrograde endocytic trafficking and Rab conversion, routing signaling cargo such as TGF-β and WNT factors and the TLR9 ligand CpG to the appropriate compartments [PMID:40152605, PMID:29130391]. Loss-of-function mutations in EPG5 cause Vici syndrome, with a block in autolysosome formation producing accumulation of autophagic cargo and selective neurodegeneration [PMID:23222957, PMID:23479740, PMID:23674064]; mechanistically, EPG5 deficiency drives proteotoxic stress, mitochondrial bioenergetic dysfunction, Ca2+-driven mtDNA release and cGAS-STING activation [PMID:42191733, PMID:27715390].","teleology":[{"year":2012,"claim":"Establishing EPG5 as a disease gene and a required factor for autophagosome clearance defined its core cellular role before any molecular mechanism was known.","evidence":"Exome sequencing of a patient cohort plus autophagy clearance assays in patient muscle and fibroblasts","pmids":["23222957"],"confidence":"High","gaps":["Molecular activity (tethering vs SNARE regulation) not defined","Direct binding partners unidentified","Mechanism of selectivity for autolysosome formation unknown"]},{"year":2013,"claim":"An in vivo knockout localized EPG5 function to autophagosome-to-autolysosome maturation and revealed a parallel role in endocytic trafficking and recycling, linking the molecular defect to selective neuronal vulnerability.","evidence":"Epg5 knockout mouse with autophagic flux, endocytic trafficking assays, IHC and EM","pmids":["23479740","23674064"],"confidence":"High","gaps":["Whether endocytic and autophagic defects share one molecular mechanism unresolved","Basis of layer 5/motor neuron selectivity not explained","No biochemical partners identified"]},{"year":2016,"claim":"Reconstitution defined EPG5's biochemical mechanism: a Rab7/VAMP-recruited effector that ensures fusion specificity by stabilizing autophagosomal trans-SNARE complexes and preventing mistargeted fusion.","evidence":"Co-IP, pulldowns, reconstituted proteoliposome fusion assay, and C. elegans/mammalian genetics with SNARE assembly assays","pmids":["27588602"],"confidence":"High","gaps":["Structural basis of SNARE proofreading not resolved","Stoichiometry of the tethering complex unknown","How EPG5 discriminates correct vs incorrect SNARE pairs unclear"]},{"year":2016,"claim":"EPG5 loss was shown to cause tissue-specific pathologies—macrophage-intrinsic lung inflammation and UPR-driven photoreceptor apoptosis—broadening its role beyond neurons.","evidence":"Epg5 knockout mice with bone marrow transplantation, transcriptomics, ERG and UPR marker analysis","pmids":["26764600","27715390"],"confidence":"Medium","gaps":["Whether inflammation is a direct or downstream consequence of autophagy block unclear","Link between UPR activation and apoptosis not fully causal","Cell-type selectivity mechanism unknown"]},{"year":2018,"claim":"EPG5 was assigned a role in innate/adaptive immunity by routing the TLR9 ligand CpG to late endosomes/lysosomes, required for memory B cell survival and plasma cell differentiation.","evidence":"Loss-of-function analysis in Vici syndrome patient cells with CpG trafficking and TLR9 signaling assays","pmids":["29130391"],"confidence":"Medium","gaps":["Direct molecular interaction routing CpG not defined","Single lab, patient-cell based","Relationship to canonical fusion function unclear"]},{"year":2019,"claim":"Discovery that USP8 deubiquitinates EPG5 at Lys252 to enhance LC3 binding revealed an upstream post-translational switch controlling EPG5 activity and autophagic flux.","evidence":"Reciprocal Co-IP, ubiquitination assays, K252 mutagenesis and ESC flux assays","pmids":["30931944"],"confidence":"Medium","gaps":["E3 ligase placing K63 chains on EPG5 unidentified","Whether other sites are modified unknown","Physiological context beyond ESCs unclear"]},{"year":2019,"claim":"Identification of miR-150 as a direct repressor placed EPG5 in a c-myc/miR-150 axis regulating autophagic flux and tumor cell proliferation.","evidence":"Luciferase reporter target validation and EPG5 knockdown rescue in NSCLC, with in vitro and in vivo growth assays","pmids":["31410206"],"confidence":"Medium","gaps":["Generality of miR-150 regulation across tissues unknown","Single lab","Whether autophagy block alone drives proliferation unresolved"]},{"year":2021,"claim":"Structural and biochemical work resolved EPG5's extended 'shepherd's staff' architecture and showed it preferentially engages GABARAP-subfamily ATG8s via tandem LIR motifs, linking the structure to mitophagy recruitment.","evidence":"Cryo-EM structure, biochemical binding assays, and mitophagy recruitment imaging/fractionation","pmids":["33674710"],"confidence":"High","gaps":["Functional contribution of each LIR motif not fully dissected","Full-length membrane-engaged conformation not captured","Basis of GABARAP preference structurally incomplete"]},{"year":2021,"claim":"Sepsis was shown to suppress EPG5–LC3 interaction via TLR4/LPS signaling in platelets, demonstrating physiological regulation of EPG5-dependent fusion in inflammation.","evidence":"Co-IP and proximity ligation assay from septic patient platelets plus an LPS/TLR4 megakaryocyte model with TEM","pmids":["34689707"],"confidence":"Medium","gaps":["Molecular step linking TLR4 signaling to EPG5–LC3 disruption unknown","Single lab","Whether post-translational modification mediates the effect untested"]},{"year":2022,"claim":"Studies of granulosa cells and irradiated glioma cells extended EPG5's degradative role to selective substrate clearance (WT1) and TGM2/SDC1-coordinated fusion, linking it to ovarian insufficiency and tumor radioresponse.","evidence":"Epg5 knockout mouse with scRNA-seq and cycloheximide chase; TMT proteomics, knockdowns and flux assays in a GBM model","pmids":["35786405","35913916"],"confidence":"Medium","gaps":["Direct EPG5–substrate recognition not established","Mechanistic placement of EPG5 downstream of TGM2 partly inferred","Generality of selective WT1 degradation unclear"]},{"year":2025,"claim":"A second cryo-EM/NMR study refined the ATG8 binding mode, showing tandem LIR motifs bind only the canonical LDS without multivalency and that LIR1 dominates, with the mode conserved in C. elegans.","evidence":"Cryo-EM, NMR, MD simulations, AlphaFold2, X-ray crystallography, ITC, GST pulldown and co-IP","pmids":["39809444"],"confidence":"High","gaps":["Functional role of the protruding thumb domain undefined","How LIR engagement couples to tethering activity unknown","In-cell conformational dynamics not resolved"]},{"year":2025,"claim":"Cross-organism work defined EPG5's role in retrograde endocytic trafficking via Rab conversion and revealed dynein-mediated MTOC-directed autophagosome positioning, mechanistically unifying its autophagic and endocytic functions.","evidence":"C. elegans genetics with trafficking reporters and HOPS epistasis; Drosophila genetic screen with live imaging of autophagosome positioning and motor manipulation","pmids":["40152605","41147582"],"confidence":"Medium","gaps":["Direct EPG5–dynein/dynactin interaction not biochemically resolved","Mechanism of Rab5-to-Rab7/10 conversion control unclear","Human conservation of positioning role untested"]},{"year":2025,"claim":"EPG5 deficiency was linked to dopaminergic neurodegeneration with defective PINK1-Parkin mitophagy and α-synuclein accumulation, connecting impaired mitochondrial quality control to parkinsonism.","evidence":"EPG5-deficient mouse with substantia nigra pathology and patient fibroblast mitophagy/α-synuclein assays","pmids":["40192014"],"confidence":"Medium","gaps":["Causal link between mitophagy defect and α-synuclein accumulation not fully resolved","Single lab","Selectivity for dopaminergic neurons unexplained"]},{"year":2026,"claim":"A mechanistic chain from impaired mitophagy to innate immune activation was defined: EPG5 loss causes Ca2+-driven mitochondrial overload, mtDNA release and cGAS-STING activation, reversible by mPTP or STING inhibition.","evidence":"Patient fibroblasts and iPSC-derived cortical neurons with mitophagy, Ca2+ imaging, cGAS-STING assays and pharmacological rescue","pmids":["42191733"],"confidence":"Medium","gaps":["Mechanism of MICU1 downregulation unknown","Whether STING activation drives neurodegeneration in vivo untested","Single lab"]},{"year":null,"claim":"How EPG5 mechanistically integrates trans-SNARE proofreading, Rab-conversion control, motor-driven positioning, and selective substrate clearance into one regulated activity—and how these map onto distinct Vici syndrome phenotypes—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of membrane-engaged EPG5","Tissue-selective vulnerability mechanism undefined","Upstream signals coordinating EPG5 activity incompletely mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,7]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,11]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3,13]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0,1,2]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,11]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,13]}],"complexes":[],"partners":["RAB7","VAMP7","VAMP8","STX17","SNAP29","GABARAP","MAP1LC3","USP8"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9HCE0","full_name":"Ectopic P granules protein 5 homolog","aliases":[],"length_aa":2579,"mass_kda":292.5,"function":"Involved in autophagy. May play a role in a late step of autophagy, such as clearance of autophagosomal cargo. Plays a key role in innate and adaptive immune response triggered by unmethylated cytidine-phosphate-guanosine (CpG) dinucleotides from pathogens, and mediated by the nucleotide-sensing receptor TLR9. It is necessary for the translocation of CpG dinucleotides from early endosomes to late endosomes and lysosomes, where TLR9 is located (PubMed:29130391)","subcellular_location":"Cytoplasm, perinuclear region; Lysosome","url":"https://www.uniprot.org/uniprotkb/Q9HCE0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/EPG5","classification":"Not Classified","n_dependent_lines":36,"n_total_lines":1208,"dependency_fraction":0.029801324503311258},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/EPG5","total_profiled":1310},"omim":[{"mim_id":"621506","title":"NEURODEVELOPMENTAL DISORDER WITH PARKINSONISM OR OTHER MOVEMENT ABNORMALITIES; NEDPAM","url":"https://www.omim.org/entry/621506"},{"mim_id":"615068","title":"ECTOPIC P-GRANULES AUTOPHAGY PROTEIN 5 HOMOLOG; EPG5","url":"https://www.omim.org/entry/615068"},{"mim_id":"242840","title":"VICI SYNDROME; VICIS","url":"https://www.omim.org/entry/242840"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear speckles","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/EPG5"},"hgnc":{"alias_symbol":["hEPG5"],"prev_symbol":["KIAA1632"]},"alphafold":{"accession":"Q9HCE0","domains":[{"cath_id":"-","chopping":"252-283_473-534_568-666_675-712","consensus_level":"medium","plddt":82.7074,"start":252,"end":712},{"cath_id":"-","chopping":"1246-1273_1286-1371_1392-1446","consensus_level":"high","plddt":84.1771,"start":1246,"end":1446},{"cath_id":"-","chopping":"2103-2196","consensus_level":"medium","plddt":80.5622,"start":2103,"end":2196},{"cath_id":"-","chopping":"2387-2457_2477-2579","consensus_level":"high","plddt":84.6237,"start":2387,"end":2579},{"cath_id":"1.10.287","chopping":"290-316_364-414_427-434","consensus_level":"high","plddt":83.8069,"start":290,"end":434},{"cath_id":"1.20.870","chopping":"717-866","consensus_level":"medium","plddt":82.9897,"start":717,"end":866},{"cath_id":"1.20.58","chopping":"1525-1570_1640-1654_1664-1707","consensus_level":"medium","plddt":85.2458,"start":1525,"end":1707},{"cath_id":"1.25.40","chopping":"2235-2337_2345-2382","consensus_level":"medium","plddt":83.3455,"start":2235,"end":2382}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HCE0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HCE0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HCE0-F1-predicted_aligned_error_v6.png","plddt_mean":73.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EPG5","jax_strain_url":"https://www.jax.org/strain/search?query=EPG5"},"sequence":{"accession":"Q9HCE0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HCE0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HCE0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HCE0"}},"corpus_meta":[{"pmid":"27588602","id":"PMC_27588602","title":"The Vici Syndrome Protein EPG5 Is a Rab7 Effector that Determines the Fusion Specificity of Autophagosomes with Late Endosomes/Lysosomes.","date":"2016","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/27588602","citation_count":244,"is_preprint":false},{"pmid":"23222957","id":"PMC_23222957","title":"Recessive mutations in EPG5 cause Vici syndrome, a multisystem disorder with defective autophagy.","date":"2012","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23222957","citation_count":210,"is_preprint":false},{"pmid":"23479740","id":"PMC_23479740","title":"Mice deficient in Epg5 exhibit selective neuronal vulnerability to degeneration.","date":"2013","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/23479740","citation_count":115,"is_preprint":false},{"pmid":"26917586","id":"PMC_26917586","title":"EPG5-related Vici syndrome: a paradigm of neurodevelopmental disorders with defective autophagy.","date":"2016","source":"Brain : a 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EPG5 also binds LC3/LGG-1 and assembled STX17-SNAP29 Qabc SNARE complexes on autophagosomes, stabilizes and facilitates assembly of STX17-SNAP29-VAMP7/8 trans-SNARE complexes, and promotes STX17-SNAP29-VAMP7-mediated fusion of reconstituted proteoliposomes. Loss of EPG5 causes abnormal fusion of autophagosomes with various endocytic vesicles partly due to elevated STX17-SNAP25-VAMP8 complex assembly.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, reconstituted proteoliposome fusion assay, C. elegans and mammalian loss-of-function genetics, SNARE complex assembly assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro fusion assay combined with multiple binding assays, mutagenesis context, and genetic epistasis across two organisms\",\n      \"pmids\": [\"27588602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Loss-of-function mutations in EPG5 cause a severe block in autophagosomal clearance, resulting in accumulation of autophagic cargo in autophagosomes, establishing EPG5 as a key regulator of autolysosome formation.\",\n      \"method\": \"Exome sequencing of patient cohort; autophagosome clearance assay in patient muscle and fibroblasts (immunofluorescence, western blot for autophagy markers)\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across multiple patient-derived cell types, multiple orthogonal methods, independently confirmed by subsequent studies\",\n      \"pmids\": [\"23222957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Epg5 deficiency in mice blocks maturation of autophagosomes into degradative autolysosomes and also impairs endocytic trafficking and endocytic recycling, leading to selective degeneration of cortical layer 5 pyramidal neurons and spinal cord motor neurons.\",\n      \"method\": \"Epg5 knockout mouse model; autophagic flux assays, endocytic trafficking assays, immunohistochemistry, electron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout model with multiple orthogonal cellular assays replicated across labs\",\n      \"pmids\": [\"23479740\", \"23674064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Human EPG5 adopts an extended 'shepherd's staff' architecture and binds preferentially to members of the GABARAP subfamily of ATG8 proteins via tandem LIR motifs that exhibit differential affinities; LIR-GABARAP interaction is required for EPG5 recruitment to mitochondria during PINK1/Parkin-dependent mitophagy.\",\n      \"method\": \"Cryo-EM structure, biochemical binding assays, mitophagy recruitment experiments (live imaging/fractionation)\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure combined with biochemical binding assays and functional mitophagy recruitment, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"33674710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structure of human EPG5 reveals helical bundles analogous to membrane tethering factors with a unique protruding thumb domain adjacent to tandem LIR motifs. NMR, molecular dynamics, and AlphaFold modeling show tandem LIR motifs bind only the canonical LIR docking site (LDS) on GABARAP without multivalent engagement; co-IP confirmed full-length EPG5-GABARAP interaction is mediated primarily by LIR1. The same binding mode is conserved in C. elegans EPG-5 with LGG-1 and LGG-2 (X-ray crystallography).\",\n      \"method\": \"Cryo-EM, NMR spectroscopy, molecular dynamics simulations, AlphaFold2 modeling, co-immunoprecipitation, X-ray crystallography, ITC affinity measurements, GST pulldown\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple structural methods (cryo-EM, X-ray, NMR) combined with biochemical validation in single rigorous study\",\n      \"pmids\": [\"39809444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The deubiquitinating enzyme USP8 binds to the coiled-coil domain of EPG5 and removes K63-linked ubiquitin chains from EPG5 at Lysine 252, leading to enhanced interaction between EPG5 and LC3, thereby maintaining autophagic flux in embryonic stem cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, site-directed mutagenesis (K252), LC3 interaction assays, ESC autophagy flux assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, mutagenesis at specific lysine, functional autophagic flux assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"30931944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TGM2 binds SDC1 and transports it from the cell membrane to lysosomes after irradiation; TGM2 then binds LC3 through two LIR motifs, coordinating autophagosome-lysosome encounter as a prerequisite for lysosomal EPG5 to recognize LC3 and stabilize the STX17-SNAP29-VAMP8 SNARE complex assembly.\",\n      \"method\": \"Tandem mass tag proteomics, knockdown experiments, co-immunoprecipitation, autophagic flux assays (GFP-RFP-LC3), in vivo GBM mouse model\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods but mechanistic placement of EPG5 is partially inferred from upstream TGM2/SDC1 knockdown data; single lab\",\n      \"pmids\": [\"35913916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"EPG5 is indispensable for transport of the TLR9 ligand CpG to the late endosomal-lysosomal compartment and for TLR9-initiated signaling essential for survival of human memory B cells and their differentiation into plasma cells.\",\n      \"method\": \"Loss-of-function analysis in Vici syndrome patient cells; CpG trafficking assays, TLR9 signaling assays, B cell survival/differentiation assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived cell loss-of-function with functional readouts, single lab\",\n      \"pmids\": [\"29130391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"During sepsis, EPG5-LC3 protein-protein interactions are significantly reduced in platelets via TLR4/LPS-dependent signaling, impairing autophagosome-lysosome fusion and causing accumulation of autophagosomes.\",\n      \"method\": \"Co-immunoprecipitation from septic patient platelets, proximity ligation assay, TEM, megakaryocyte model with LPS/TLR4 manipulation\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and PLA from patient samples plus mechanistic megakaryocyte model, single lab, two orthogonal interaction methods\",\n      \"pmids\": [\"34689707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"EPG5 knockout blocks autophagic flux in granulosa cells, causing accumulation of WT1 transcription factor that would normally be degraded by autophagy; failure to degrade WT1 in antral follicular stage reduces steroidogenesis-related gene expression and disrupts granulosa cell differentiation, leading to primary ovarian insufficiency.\",\n      \"method\": \"Epg5 knockout mouse, single-cell RNA sequencing, autophagic flux assays, cycloheximide chase for WT1 stability, co-IP/interaction assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout with cellular mechanism defined by scRNA-seq and protein stability assays, single lab\",\n      \"pmids\": [\"35786405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Epg5 plays a role in lung macrophage physiology to limit innate immune inflammation; deletion of Epg5 leads to elevated baseline innate immune cellular and cytokine-based lung inflammation, as confirmed by bone marrow transplantation experiments showing the phenotype is macrophage-intrinsic.\",\n      \"method\": \"Epg5 knockout mouse, bone marrow transplantation, lung transcriptomics, cellular cytokine expression analysis\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bone marrow transplantation cell-type specificity experiments plus transcriptomics, single lab\",\n      \"pmids\": [\"26764600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In C. elegans, EPG-5 modulates TGFB/TGF-β and WNT signaling by controlling retrograde endocytic trafficking; in epg-5 mutants, TGFB receptor SMA-6 and WNT secretion factor MIG-14 are trapped in hybrid endosomal structures. EPG-5 loss causes defective RAB-5/RAB-7 and RAB-5/RAB-10 conversion leading to hybrid vesicle formation; defects are ameliorated by knockdown of HOPS complex components.\",\n      \"method\": \"C. elegans genetics, fluorescence microscopy of trafficking reporters, epistasis with HOPS complex knockdown, RAB conversion assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis and live imaging in C. elegans ortholog, single lab, multiple cargo readouts\",\n      \"pmids\": [\"40152605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Drosophila fat cells, pre-fusion autophagosomes move toward the non-centrosomal MTOC via a dynein-dynactin complex regulated by Rab7 and its adaptor Epg5 (together with Rab39/ema); Epg5 loss-of-function impairs this MTOC-directed movement and reduces autophagosome-lysosome fusion efficiency.\",\n      \"method\": \"Loss-of-function genetic screen in Drosophila, live imaging of autophagosome positioning, motor manipulation experiments\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Drosophila ortholog genetic screen with live imaging and functional fusion readout, single lab\",\n      \"pmids\": [\"41147582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In EPG5-deficient patient-derived fibroblasts and iPSC-derived cortical neurons, impaired mitophagy leads to mitochondrial bioenergetic dysfunction; physiological Ca2+ signals cause mitochondrial Ca2+ overload (attributed to MICU1 downregulation), mitochondrial depolarization, mtDNA release, and activation of the cGAS-STING innate immune pathway. These effects are reversed by inhibition of the mitochondrial permeability transition pore or the STING pathway.\",\n      \"method\": \"Patient-derived fibroblasts, iPSC-derived cortical neurons, mitophagy assays, mitochondrial membrane potential measurement, Ca2+ imaging, cGAS-STING pathway activation assays, pharmacological inhibition\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived cells with multiple orthogonal mechanistic assays and pharmacological rescue, single lab\",\n      \"pmids\": [\"42191733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"EPG5 deficiency in mice leads to progressive dopaminergic neurodegeneration in the substantia nigra, and patient-derived fibroblasts show defects in PINK1-Parkin-dependent mitophagic clearance and α-synuclein overexpression, linking EPG5 to a cellular basis for parkinsonism.\",\n      \"method\": \"EPG5-deficient mouse model, patient-derived fibroblast mitophagy assays, α-synuclein immunostaining, PINK1-Parkin pathway assays\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model combined with patient fibroblast mechanistic assays, single lab\",\n      \"pmids\": [\"40192014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Proteotoxic stress due to impaired autophagic clearance from EPG5 loss correlates with and co-regulates seizure-like behaviors in Drosophila; the epileptogenesis is a direct consequence of proteotoxic stress and age-dependent neurodegeneration rather than an independent pathway.\",\n      \"method\": \"Drosophila epg5 loss-of-function, electrocorticography, behavioral seizure assays (DART), proteotoxic stress markers, correlation analysis\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Drosophila genetics with electrophysiological and behavioral readouts, single lab\",\n      \"pmids\": [\"39342484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-150 directly represses EPG5, blocking autophagosome-lysosome fusion; EPG5 knockdown promotes NSCLC cell proliferation and recapitulates miR-150 overexpression effects, placing EPG5 downstream of c-myc/miR-150 in regulating autophagic flux.\",\n      \"method\": \"miR-150 target validation (luciferase reporter, EPG5 protein level), EPG5 knockdown, autophagic flux assays (GFP-LC3), in vitro and in vivo tumor growth assays\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct target validation with reporter assay and functional knockdown rescue, single lab\",\n      \"pmids\": [\"31410206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Epg5-deficient mice show accumulation of ubiquitin-positive inclusions and SQSTM1 aggregates in retinal cells with impaired autophagosome maturation, leading to unfolded protein response (UPR) activation and elevated DDIT3/CHOP and cleaved CASP3, resulting in apoptotic photoreceptor cell death recapitulating retinitis pigmentosa.\",\n      \"method\": \"Epg5 knockout mouse, immunofluorescence, western blot (UPR markers), photoreceptor function tests (ERG), cell counting in outer nuclear layer\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vivo knockout with defined molecular mechanism but limited to single lab\",\n      \"pmids\": [\"27715390\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EPG5 is a metazoan-specific autophagy tethering factor that adopts an extended helical 'shepherd's staff' architecture; it is recruited to late endosomes/lysosomes via direct binding to Rab7 and VAMP7/8, simultaneously engages autophagosomes through tandem LIR motifs that preferentially bind GABARAP-subfamily ATG8 proteins, and enforces fusion specificity by stabilizing and facilitating assembly of STX17-SNAP29-VAMP7/8 trans-SNARE complexes—a function modulated upstream by USP8-mediated K63-deubiquitination at Lys252 that enhances EPG5-LC3 interaction. Beyond canonical autophagy, EPG5 regulates retrograde endocytic trafficking of signaling receptors, controls TLR9 ligand routing to late endosomes for innate/adaptive immune signaling, and positions autophagosomes toward the MTOC via a Rab7-dynein axis; its loss leads to mitochondrial bioenergetic dysfunction, Ca2+-driven mtDNA release, cGAS-STING activation, proteotoxic stress, and selective neurodegeneration, collectively explaining the multisystem pathology of Vici syndrome.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EPG5 is a metazoan autophagy tethering factor that enforces the specificity of autophagosome–lysosome fusion during the terminal, degradative step of autophagy [#0, #1]. Functioning as a Rab7 effector, it is recruited to late endosomes/lysosomes through direct binding to Rab7 and the R-SNARE VAMP7/8, while simultaneously engaging autophagosomes by binding LC3 and assembled STX17–SNAP29 SNARE complexes; in this position it stabilizes and promotes assembly of STX17–SNAP29–VAMP7/8 trans-SNARE complexes and drives fusion of reconstituted proteoliposomes, with its loss permitting aberrant fusion of autophagosomes with non-autolysosomal endocytic vesicles [#0]. Structurally, EPG5 adopts an extended helical 'shepherd's staff' architecture and recognizes ATG8 proteins through tandem LIR motifs that preferentially bind the GABARAP subfamily via the canonical LIR docking site, an interaction required for its recruitment to mitochondria during PINK1/Parkin-dependent mitophagy [#3, #4]. The EPG5–LC3 interaction is itself regulated: USP8 binds the EPG5 coiled-coil domain and removes K63-linked ubiquitin at Lys252 to enhance LC3 binding and sustain autophagic flux [#5]. Beyond canonical degradation, EPG5 controls retrograde endocytic trafficking and Rab conversion, routing signaling cargo such as TGF-β and WNT factors and the TLR9 ligand CpG to the appropriate compartments [#11, #7]. Loss-of-function mutations in EPG5 cause Vici syndrome, with a block in autolysosome formation producing accumulation of autophagic cargo and selective neurodegeneration [#1, #2]; mechanistically, EPG5 deficiency drives proteotoxic stress, mitochondrial bioenergetic dysfunction, Ca2+-driven mtDNA release and cGAS-STING activation [#13, #17].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Establishing EPG5 as a disease gene and a required factor for autophagosome clearance defined its core cellular role before any molecular mechanism was known.\",\n      \"evidence\": \"Exome sequencing of a patient cohort plus autophagy clearance assays in patient muscle and fibroblasts\",\n      \"pmids\": [\"23222957\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular activity (tethering vs SNARE regulation) not defined\", \"Direct binding partners unidentified\", \"Mechanism of selectivity for autolysosome formation unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"An in vivo knockout localized EPG5 function to autophagosome-to-autolysosome maturation and revealed a parallel role in endocytic trafficking and recycling, linking the molecular defect to selective neuronal vulnerability.\",\n      \"evidence\": \"Epg5 knockout mouse with autophagic flux, endocytic trafficking assays, IHC and EM\",\n      \"pmids\": [\"23479740\", \"23674064\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether endocytic and autophagic defects share one molecular mechanism unresolved\", \"Basis of layer 5/motor neuron selectivity not explained\", \"No biochemical partners identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Reconstitution defined EPG5's biochemical mechanism: a Rab7/VAMP-recruited effector that ensures fusion specificity by stabilizing autophagosomal trans-SNARE complexes and preventing mistargeted fusion.\",\n      \"evidence\": \"Co-IP, pulldowns, reconstituted proteoliposome fusion assay, and C. elegans/mammalian genetics with SNARE assembly assays\",\n      \"pmids\": [\"27588602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of SNARE proofreading not resolved\", \"Stoichiometry of the tethering complex unknown\", \"How EPG5 discriminates correct vs incorrect SNARE pairs unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"EPG5 loss was shown to cause tissue-specific pathologies—macrophage-intrinsic lung inflammation and UPR-driven photoreceptor apoptosis—broadening its role beyond neurons.\",\n      \"evidence\": \"Epg5 knockout mice with bone marrow transplantation, transcriptomics, ERG and UPR marker analysis\",\n      \"pmids\": [\"26764600\", \"27715390\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether inflammation is a direct or downstream consequence of autophagy block unclear\", \"Link between UPR activation and apoptosis not fully causal\", \"Cell-type selectivity mechanism unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"EPG5 was assigned a role in innate/adaptive immunity by routing the TLR9 ligand CpG to late endosomes/lysosomes, required for memory B cell survival and plasma cell differentiation.\",\n      \"evidence\": \"Loss-of-function analysis in Vici syndrome patient cells with CpG trafficking and TLR9 signaling assays\",\n      \"pmids\": [\"29130391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular interaction routing CpG not defined\", \"Single lab, patient-cell based\", \"Relationship to canonical fusion function unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovery that USP8 deubiquitinates EPG5 at Lys252 to enhance LC3 binding revealed an upstream post-translational switch controlling EPG5 activity and autophagic flux.\",\n      \"evidence\": \"Reciprocal Co-IP, ubiquitination assays, K252 mutagenesis and ESC flux assays\",\n      \"pmids\": [\"30931944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase placing K63 chains on EPG5 unidentified\", \"Whether other sites are modified unknown\", \"Physiological context beyond ESCs unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of miR-150 as a direct repressor placed EPG5 in a c-myc/miR-150 axis regulating autophagic flux and tumor cell proliferation.\",\n      \"evidence\": \"Luciferase reporter target validation and EPG5 knockdown rescue in NSCLC, with in vitro and in vivo growth assays\",\n      \"pmids\": [\"31410206\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality of miR-150 regulation across tissues unknown\", \"Single lab\", \"Whether autophagy block alone drives proliferation unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Structural and biochemical work resolved EPG5's extended 'shepherd's staff' architecture and showed it preferentially engages GABARAP-subfamily ATG8s via tandem LIR motifs, linking the structure to mitophagy recruitment.\",\n      \"evidence\": \"Cryo-EM structure, biochemical binding assays, and mitophagy recruitment imaging/fractionation\",\n      \"pmids\": [\"33674710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional contribution of each LIR motif not fully dissected\", \"Full-length membrane-engaged conformation not captured\", \"Basis of GABARAP preference structurally incomplete\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Sepsis was shown to suppress EPG5–LC3 interaction via TLR4/LPS signaling in platelets, demonstrating physiological regulation of EPG5-dependent fusion in inflammation.\",\n      \"evidence\": \"Co-IP and proximity ligation assay from septic patient platelets plus an LPS/TLR4 megakaryocyte model with TEM\",\n      \"pmids\": [\"34689707\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular step linking TLR4 signaling to EPG5–LC3 disruption unknown\", \"Single lab\", \"Whether post-translational modification mediates the effect untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Studies of granulosa cells and irradiated glioma cells extended EPG5's degradative role to selective substrate clearance (WT1) and TGM2/SDC1-coordinated fusion, linking it to ovarian insufficiency and tumor radioresponse.\",\n      \"evidence\": \"Epg5 knockout mouse with scRNA-seq and cycloheximide chase; TMT proteomics, knockdowns and flux assays in a GBM model\",\n      \"pmids\": [\"35786405\", \"35913916\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct EPG5–substrate recognition not established\", \"Mechanistic placement of EPG5 downstream of TGM2 partly inferred\", \"Generality of selective WT1 degradation unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A second cryo-EM/NMR study refined the ATG8 binding mode, showing tandem LIR motifs bind only the canonical LDS without multivalency and that LIR1 dominates, with the mode conserved in C. elegans.\",\n      \"evidence\": \"Cryo-EM, NMR, MD simulations, AlphaFold2, X-ray crystallography, ITC, GST pulldown and co-IP\",\n      \"pmids\": [\"39809444\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of the protruding thumb domain undefined\", \"How LIR engagement couples to tethering activity unknown\", \"In-cell conformational dynamics not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Cross-organism work defined EPG5's role in retrograde endocytic trafficking via Rab conversion and revealed dynein-mediated MTOC-directed autophagosome positioning, mechanistically unifying its autophagic and endocytic functions.\",\n      \"evidence\": \"C. elegans genetics with trafficking reporters and HOPS epistasis; Drosophila genetic screen with live imaging of autophagosome positioning and motor manipulation\",\n      \"pmids\": [\"40152605\", \"41147582\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct EPG5–dynein/dynactin interaction not biochemically resolved\", \"Mechanism of Rab5-to-Rab7/10 conversion control unclear\", \"Human conservation of positioning role untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"EPG5 deficiency was linked to dopaminergic neurodegeneration with defective PINK1-Parkin mitophagy and α-synuclein accumulation, connecting impaired mitochondrial quality control to parkinsonism.\",\n      \"evidence\": \"EPG5-deficient mouse with substantia nigra pathology and patient fibroblast mitophagy/α-synuclein assays\",\n      \"pmids\": [\"40192014\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal link between mitophagy defect and α-synuclein accumulation not fully resolved\", \"Single lab\", \"Selectivity for dopaminergic neurons unexplained\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"A mechanistic chain from impaired mitophagy to innate immune activation was defined: EPG5 loss causes Ca2+-driven mitochondrial overload, mtDNA release and cGAS-STING activation, reversible by mPTP or STING inhibition.\",\n      \"evidence\": \"Patient fibroblasts and iPSC-derived cortical neurons with mitophagy, Ca2+ imaging, cGAS-STING assays and pharmacological rescue\",\n      \"pmids\": [\"42191733\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of MICU1 downregulation unknown\", \"Whether STING activation drives neurodegeneration in vivo untested\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How EPG5 mechanistically integrates trans-SNARE proofreading, Rab-conversion control, motor-driven positioning, and selective substrate clearance into one regulated activity—and how these map onto distinct Vici syndrome phenotypes—remains unresolved.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of membrane-engaged EPG5\", \"Tissue-selective vulnerability mechanism undefined\", \"Upstream signals coordinating EPG5 activity incompletely mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 11]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RAB7\", \"VAMP7\", \"VAMP8\", \"STX17\", \"SNAP29\", \"GABARAP\", \"MAP1LC3\", \"USP8\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}