{"gene":"ATG5","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":1996,"finding":"APG5 (yeast ortholog of ATG5) is required for autophagy in Saccharomyces cerevisiae; null mutant cells fail to sequester autophagic bodies in the vacuole under nitrogen starvation, demonstrating that APG5 function is essential specifically under nutrient-starvation conditions.","method":"Yeast null mutant construction, complementation of autophagy-defective phenotype, microscopic analysis of autophagic bodies","journal":"Gene","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic complementation plus phenotypic readout in yeast ortholog; foundational loss-of-function study replicated by subsequent mammalian work","pmids":["8921905"],"is_preprint":false},{"year":1998,"finding":"Human ATG5 (hAPG5) was cloned and shown to share significant homology with yeast APG5, identifying it as the mammalian ortholog involved in autophagy; protein expression is regulated at the translational level.","method":"cDNA cloning from human expression library, sequence homology analysis, Northern blot","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — cloning and sequence analysis across multiple labs; functional validation indirect","pmids":["9563500"],"is_preprint":false},{"year":2001,"finding":"The ATG12–ATG5 conjugate localizes to the isolation membrane throughout its elongation process and is required for autophagosome formation; the covalent modification of ATG5 with ATG12 is not required for membrane targeting of ATG5 but is essential for isolation membrane elongation. ATG12–ATG5 is also required for targeting of the mammalian ATG8 homolog LC3 to isolation membranes.","method":"GFP-tagged ATG5 live imaging, ATG5-deficient mouse embryonic stem cells (genetic knockout), immunofluorescence, electron microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (live imaging, KO cells, LC3 targeting assay) in a single rigorous study; widely replicated","pmids":["11266458"],"is_preprint":false},{"year":2002,"finding":"In yeast, the APG12–APG5 conjugate and APG16 form an ~350 kDa multimeric complex; this complex formation, mediated by APG16 homo-oligomerization, is essential for autophagic activity.","method":"In vivo oligomerization control system, size-exclusion chromatography, autophagy activity assays in yeast","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo oligomerization system with direct functional readout, yeast ortholog study closely mirroring mammalian complex","pmids":["11897782"],"is_preprint":false},{"year":2003,"finding":"Mouse ATG16L (Apg16L) is a novel WD-repeat protein that interacts with ATG5 (and with additional ATG16L monomers) to form an ~800 kDa complex containing the ATG12–ATG5 conjugate; this complex associates with the autophagic isolation membrane. Membrane targeting of ATG16L requires ATG5 but not ATG12. The WD-repeat domain is not required for ATG5 binding or ATG16L oligomerization.","method":"Co-immunoprecipitation, size-exclusion chromatography, immunofluorescence localization, domain-deletion analysis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, domain mapping, and localization studies; independently corroborated","pmids":["12665549"],"is_preprint":false},{"year":2009,"finding":"Mouse cells lacking ATG5 or ATG7 can still form autophagosomes/autolysosomes and perform autophagy-mediated protein degradation under certain stresses via an alternative macroautophagy pathway. This ATG5/ATG7-independent alternative autophagy does not involve LC3 lipidation but is Rab9-dependent, and autophagosomes are generated by fusion of isolation membranes with vesicles from the trans-Golgi and late endosomes.","method":"ATG5-knockout and ATG7-knockout mouse cells, electron microscopy, LC3 lipidation assays, Rab9 dependency analysis, in vivo erythroid maturation studies","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO in multiple cell types, multiple orthogonal methods, in vivo corroboration; published in top-tier journal","pmids":["19794493"],"is_preprint":false},{"year":2013,"finding":"ATG5 translocates to the nucleus in response to DNA-damaging agents (etoposide, cisplatin) where it physically interacts with survivin, displacing elements of the chromosomal passenger complex and causing chromosome misalignment and mitotic catastrophe independently of autophagy.","method":"Nuclear fractionation, co-immunoprecipitation (ATG5–survivin interaction), pharmacological autophagy inhibition, immunohistochemistry in patient carcinoma tissues","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP confirmed in vitro and in patient tissues, autophagy-independent mechanism validated pharmacologically, multiple orthogonal methods","pmids":["23945651"],"is_preprint":false},{"year":2014,"finding":"ATG5-mediated autophagy promotes astrocyte differentiation in the developing mouse cortex by degrading the inhibitory protein SOCS2, thereby activating the JAK2-STAT3 pathway; the differentiation defect from ATG5 loss can be rescued by SOCS2 knockdown or STAT3 overexpression.","method":"In vivo conditional knockout, in vitro ATG5 overexpression and knockdown, epistasis rescue experiments (SOCS2 KD, STAT3 OE), immunofluorescence","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (SOCS2 knockdown rescue), in vivo and in vitro evidence, two orthogonal methods, single lab","pmids":["25227738"],"is_preprint":false},{"year":2016,"finding":"A homozygous missense mutation in ATG5 in human patients causes congenital ataxia with mental retardation; patient cells display decreased autophagy flux and defects in conjugation of ATG12 to ATG5. The homologous yeast mutation reduces autophagy 30–50%, and flies expressing the mutant human ATG5 exhibit severe movement disorder.","method":"Human genetics (homozygous patient mutation), autophagy flux assay in patient cells, ATG12–ATG5 conjugation assay, yeast homologous mutation, Drosophila substitution experiments","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — human disease mutation validated across three model systems with direct biochemical (conjugation) and functional (flux) readouts","pmids":["26812546"],"is_preprint":false},{"year":2016,"finding":"Proximal tubule-specific deletion of ATG5 in mice causes marked G2/M cell cycle arrest and severe renal fibrosis; overexpression of wild-type ATG5, but not the autophagy-incompetent ATG5 K130R mutant, rescues G2/M arrest, demonstrating that ATG5 regulates cell cycle progression in an autophagy-dependent manner.","method":"Conditional knockout mice (UUO model), primary tubular cell culture, ATG5 K130R mutant rescue experiment, flow cytometry cell-cycle analysis, Western blot","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Moderate — KO with defined phenotype plus autophagy-incompetent point-mutant rescue, two orthogonal methods, single lab","pmids":["27304991"],"is_preprint":false},{"year":2016,"finding":"RACK1 (GNB2L1) is a novel ATG5-interacting protein; RACK1–ATG5 interaction is stimulated by canonical autophagy inducers (starvation, mTOR inhibition) and is required for autophagy activation, as RACK1 knockdown or prevention of its binding to ATG5 by mutagenesis blocks autophagy.","method":"Co-immunoprecipitation, mutagenesis preventing RACK1–ATG5 binding, RACK1 knockdown, multiple independent interaction techniques","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple independent interaction assays plus mutagenesis and KD phenotype, single lab","pmids":["27325703"],"is_preprint":false},{"year":2017,"finding":"RAB37, when GTP-bound, directly binds ATG5 and promotes formation of the ATG5–ATG12–ATG16L1 complex on the isolation membrane, facilitating LC3B lipidation and autophagosome formation; GDP-stabilized RAB37 impairs this interaction.","method":"Co-immunoprecipitation, mutation analysis (GTP/GDP forms), LC3B lipidation assay, autophagosome formation assay, ATG16L1 interaction assay","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding shown with GTPase mutant controls and functional downstream readout, single lab","pmids":["29229996"],"is_preprint":false},{"year":2017,"finding":"DAPK2 interacts with ATG5 and this interaction is essential for ATRA-induced autophagy in APL cells; TP73-mediated transcription of DAPK2 drives the p73-DAPK2-ATG5 pathway for autophagy. In contrast, DAPK2 mediates ATO-induced apoptosis independently of ATG5.","method":"Co-immunoprecipitation (DAPK2–ATG5 interaction), DAPK2 and TP73 siRNA knockdown, pathway epistasis, APL cell treatment assays","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus pathway epistasis via siRNA, single lab","pmids":["28978663"],"is_preprint":false},{"year":2018,"finding":"ATG5 is required for BCR polarization, centrosome relocalization to the immune synapse, and actin nucleation in B cells after BCR stimulation; the ATG12–ATG5–ATG16L1 complex interacts with the centrosome-associated protein PCM1, which is required for BCR polarization and MHC class II antigen presentation of particulate antigens.","method":"ATG5-conditional B cell knockout mice, immunofluorescence (BCR polarization, centrosome, actin), co-immunoprecipitation (ATG16L1–PCM1), T cell priming assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO plus co-IP identifying complex, defined cellular phenotype, single lab with multiple readouts","pmids":["30196744"],"is_preprint":false},{"year":2018,"finding":"The ATG5-binding and coiled-coil domains of ATG16L1 are sufficient for canonical autophagy and tissue homeostasis in mice, whereas the WD domain of ATG16L1 is specifically required for LC3-associated phagocytosis (LAP) but not for canonical autophagy.","method":"Domain-deletion mouse models (WD-domain deletion, coiled-coil E230 deletion), autophagy cargo assays (LC3, p62), tissue histology, SQSTM1 inclusion analysis","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-specific mouse knockins with multiple tissue and biochemical readouts distinguishing autophagy from LAP","pmids":["30403914"],"is_preprint":false},{"year":2019,"finding":"ATG5-mediated autophagy in proximal tubular epithelial cells suppresses NF-κB signaling: ATG5 co-immunoprecipitates with NF-κB p65, and ATG5 (but not autophagy-incompetent ATG5 K130R mutant) reduces angiotensin II-induced phosphorylation and nuclear translocation of p65, thereby reducing pro-inflammatory cytokine production.","method":"Conditional tubule-specific ATG5 KO mice, co-immunoprecipitation (ATG5–p65), immunofluorescence colocalization, siRNA knockdown, ATG5 K130R mutant, UUO in vivo model","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP confirming physical ATG5–p65 interaction, autophagy-incompetent mutant control, in vivo and in vitro corroboration; two orthogonal methods","pmids":["30874544"],"is_preprint":false},{"year":2019,"finding":"ATG5 regulates CD36 expression and MHC class II antigen presentation in dendritic cells: ATG5 deletion leads to elevated CD36 expression and excessive lipid accumulation, causing increased phagocytosis of apoptotic tumor cells but reduced CD4+ T cell priming.","method":"Dendritic cell-specific ATG5 conditional knockout mice, CD36 blockade experiments, T cell priming assays, lipid accumulation assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined pathway mechanism (CD36 blockade rescue), single lab","pmids":["30900506"],"is_preprint":false},{"year":2020,"finding":"Calpain-mediated proteolytic cleavage of ATG5 (and LAMP2) during diabetic myocardial ischemia-reperfusion injury impairs autophagic flux; calpain inhibition restores ATG5 levels and co-overexpression of ATG5 and LAMP2 reduces myocardial injury and normalizes autophagic flux.","method":"STZ-induced diabetic mouse I/R model, calpain inhibition, co-overexpression of ATG5+LAMP2, Western blot, LC3/p62 flux assays","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — calpain inhibition plus ATG5/LAMP2 overexpression rescue in vivo and in vitro, single lab","pmids":["36562207"],"is_preprint":false},{"year":2022,"finding":"USP22 stabilizes ATG5 by removing K27- and K48-linked ubiquitin chains at Lys118, thereby preventing ATG5 degradation and promoting ATG5-mediated autophagy to suppress NLRP3 inflammasome activation.","method":"Co-immunoprecipitation, ubiquitination site mapping (K118), USP22 knockdown/knockout, NLRP3 inflammasome activation assays, in vivo inflammation models","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination site identified with functional rescue, single lab, multiple methods","pmids":["35900990"],"is_preprint":false},{"year":2022,"finding":"A hydrocarbon-stapled peptide derived from ATG16L1 binds ATG5 with high affinity, resists proteolysis, and inhibits autophagy in cells by disrupting the ATG5–ATG16L1 protein-protein interaction.","method":"Stapled peptide synthesis, binding affinity assay, proteolysis resistance assay, cell-based autophagy inhibition assay","journal":"Journal of the American Chemical Society","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct binding measurement plus cellular functional readout; validates ATG5–ATG16L1 PPI as druggable, single lab","pmids":["36107218"],"is_preprint":false},{"year":2023,"finding":"ATG5, in the absence of other canonical autophagy ATGs, prevents lysosomal exocytosis and excessive secretion of extracellular vesicles; loss of ATG5 (but not other canonical ATGs) promotes lysosomal disrepair. An alternative conjugation complex, ATG12–ATG3, sequesters ESCRT protein ALIX in ATG5 KO cells, impairing membrane repair and exosome secretion. In murine neutrophils, ATG5 loss causes excessive degranulation.","method":"ATG5 and other ATG knockout human cell lines, lysosomal exocytosis assay, extracellular vesicle secretion assay, ATG12–ATG3–ALIX co-immunoprecipitation, murine Atg5fl/fl LysM-Cre neutrophil degranulation assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple ATG KO lines distinguishing ATG5-specific function, co-IP identifying ATG12-ATG3-ALIX complex, in vivo corroboration, two orthogonal methods","pmids":["37054706"],"is_preprint":false},{"year":2023,"finding":"TECPR1 forms an alternative E3-like conjugation complex with the ATG12–ATG5 conjugate at damaged lysosomes that regulates ATG16L1-independent unconventional LC3 lipidation; TECPR1 recruitment to damaged membranes occurs via its N-terminal dysferlin domain and precedes lysophagy induction. Double knockout of ATG16L1 and TECPR1 abolishes LC3 lipidation and impairs lysosomal recovery.","method":"Co-immunoprecipitation (TECPR1–ATG12–ATG5 complex), domain deletion analysis (dysferlin domain), ATG16L1/TECPR1 double knockout, LC3 lipidation assays, lysosomal damage recovery assay","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — complex co-IP with domain mapping, double KO epistasis, direct functional readout; multiple orthogonal methods","pmids":["37381828"],"is_preprint":false},{"year":2023,"finding":"ATG5 specifically recognizes cysteine-linked homodimerized, phosphorylated BST2/tetherin that is tethering HIV-1 virions at the plasma membrane; ATG5 and BST2 form a complex independently of Vpu and ahead of LC3C recruitment, initiating an LC3C-associated pathway. ATG12 conjugation to ATG5 is dispensable for this BST2 interaction.","method":"Co-immunoprecipitation (ATG5–BST2 complex), BST2 phosphorylation/dimerization mutants, Vpu-independent complex formation assay, ATG12–ATG5 conjugation-deficient mutant analysis, LC3C recruitment assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP with multiple biochemical mutant controls (phospho-BST2, ATG12-conjugation mutant), mechanistic pathway ordering established, multiple orthogonal methods","pmids":["37155854"],"is_preprint":false},{"year":2023,"finding":"The ATG12–ATG5–ATG16L1 complex (E3) increases and accelerates LC3/GABARAP lipidation and promotes vesicle tethering but inhibits LC3/GABARAP-induced inter-vesicular lipid mixing/fusion, suggesting the complex regulates phagophore expansion by modulating tethering versus fusion activities.","method":"In vitro reconstitution with purified ATG12–ATG5–ATG16L1 complex, liposome-based LC3 lipidation assay, vesicle tethering and lipid mixing assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified complex and quantitative functional assays; single lab but multiple orthogonal in vitro readouts","pmids":["37062893"],"is_preprint":false},{"year":2025,"finding":"ATG5 in neutrophils suppresses type I interferon-induced PAD4-mediated histone citrullination and NET release, and suppresses type I IFN-induced CXCL2 secretion and neutrophil swarming during M. tuberculosis infection; this function is autophagy-independent.","method":"Atg5fl/fl-LysM-Cre conditional KO mice, in vivo and in vitro Mtb infection, PAD4 citrullination assay, NET release assay, CXCL2 secretion assay, type I IFN pathway analysis","journal":"Nature microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple defined mechanistic readouts in vivo and in vitro; published in high-quality journal, multiple orthogonal methods","pmids":["40374743"],"is_preprint":false},{"year":2022,"finding":"HACE1 E3 ubiquitin ligase promotes K63-linked ubiquitination of ATG5, leading to its proteasomal degradation; HMBOX1 transcriptionally upregulates HACE1, thereby reducing ATG5 protein levels and inhibiting autophagy to sensitize colorectal cancer cells to 5-fluorouracil.","method":"Mass-spectrometry proteomics, co-immunoprecipitation, ubiquitination site mapping (K63), ChIP assay (HMBOX1 on HACE1 promoter), in vivo xenograft, single-cell RNA sequencing","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination site identified with co-IP and functional rescue, ChIP for upstream transcriptional mechanism, single lab","pmids":["40126194"],"is_preprint":false},{"year":2024,"finding":"ATG5 interacts with SMOX (spermine oxidase) under physiological conditions and during TGF-β1-induced fibrogenesis, preserving cellular spermine levels; ATG5 downregulation increases SMOX expression and reduces spermine, promoting renal senescence and fibrosis.","method":"Co-immunoprecipitation (ATG5–SMOX), ATG5 knockdown in tubular epithelial cells, SMOX genetic knockout mice, spermine measurement, fibrosis assays in vivo","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP showing direct ATG5–SMOX interaction, genetic models both in vitro and in vivo, single lab","pmids":["38775007"],"is_preprint":false},{"year":2024,"finding":"ATG5 mediates lipophagy in corneal epithelial cells under hyperosmotic stress by interacting with perilipin3 (confirmed by co-immunoprecipitation and immunofluorescence); this lipophagy increases free fatty acid levels and lipid peroxidation, driving ferroptosis. ATG5 inhibition ameliorates corneal damage and suppresses ferroptosis in a dry eye mouse model.","method":"Co-immunoprecipitation (ATG5–perilipin3), immunofluorescence colocalization, siRNA-mediated ATG5 inhibition in vivo (cholesterol-modified siRNA), lipidomics, ferroptosis marker assays, transmission electron microscopy","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP identifying ATG5–perilipin3 interaction, in vivo knockdown with functional ferroptosis readout, single lab","pmids":["39636725"],"is_preprint":false}],"current_model":"ATG5 is a core autophagy protein that forms a covalent conjugate with ATG12 and then assembles with ATG16L1 into a large (~800 kDa) E3-like ligase complex that localizes to the phagophore/isolation membrane, where it catalyzes lipidation (PE-conjugation) of LC3/ATG8 proteins to drive autophagosome expansion; beyond canonical autophagy, ATG5 has autophagy-independent functions including nuclear translocation to interact with survivin and trigger mitotic catastrophe, acting as a signaling scaffold at the plasma membrane to engage phosphorylated BST2 and initiate an LC3C-associated pathway, and suppressing type I interferon-driven NET release and CXCL2 secretion in neutrophils, while its activity is regulated by post-translational modifications including USP22-mediated deubiquitination at K118 and calpain-mediated cleavage."},"narrative":{"mechanistic_narrative":"ATG5 is a core autophagy effector that, after covalent conjugation to ATG12, assembles with ATG16L1 into a large (~800 kDa) E3-like complex on the autophagic isolation membrane to drive LC3/ATG8 lipidation and autophagosome formation [PMID:11266458, PMID:12665549, PMID:37062893]. The pathway is evolutionarily conserved from yeast APG5, where it is essential for starvation-induced autophagy [PMID:8921905], to mammals, where the ATG12–ATG5 conjugate and the ATG16L1 oligomer co-localize to the elongating isolation membrane and are required for LC3 targeting and membrane elongation [PMID:11266458, PMID:11897782, PMID:12665549]. In reconstitution, the purified ATG12–ATG5–ATG16L1 complex accelerates LC3/GABARAP lipidation and tethers vesicles while restraining inter-vesicular fusion, positioning it as the regulator of phagophore expansion [PMID:37062893]; conjugation of ATG12 to ATG5 is dispensable for membrane targeting but required for elongation [PMID:11266458]. ATG5 activity is gated by post-translational control: HACE1 directs K63-linked ubiquitination driving proteasomal degradation, USP22 removes K27/K48 chains at Lys118 to stabilize the protein, and calpain cleaves ATG5 to impair autophagic flux under ischemic stress [PMID:40126194, PMID:35900990, PMID:36562207]. Beyond canonical autophagy, ATG5 acts independently of the conjugation machinery in several settings: it engages alternative E3-like partners such as TECPR1 to drive ATG16L1-independent LC3 lipidation at damaged lysosomes [PMID:37381828], translocates to the nucleus to bind survivin and trigger mitotic catastrophe after DNA damage [PMID:23945651], recognizes phosphorylated dimerized BST2/tetherin at the plasma membrane to initiate an LC3C-associated pathway against HIV-1 [PMID:37155854], and restrains type I interferon-driven NET release and CXCL2 secretion in neutrophils during M. tuberculosis infection [PMID:40374743]. ATG5-dependent autophagy further shapes cell-fate and immune outcomes by degrading SOCS2 to license JAK2-STAT3-driven astrocyte differentiation [PMID:25227738], suppressing NF-κB and NLRP3 inflammasome signaling [PMID:30874544, PMID:35900990], and controlling lysosomal exocytosis and extracellular-vesicle secretion via an ATG12–ATG3–ALIX axis [PMID:37054706]. A homozygous missense ATG5 mutation that impairs ATG12 conjugation and autophagy flux causes congenital ataxia with intellectual disability in humans [PMID:26812546].","teleology":[{"year":1996,"claim":"Established that the ATG5 gene product is genetically required for autophagy, defining its foundational loss-of-function phenotype.","evidence":"Yeast APG5 null mutant with complementation and microscopic scoring of autophagic bodies under nitrogen starvation","pmids":["8921905"],"confidence":"High","gaps":["No molecular mechanism for how APG5 acts on membranes","Mammalian relevance not yet shown"]},{"year":1998,"claim":"Identified the human ortholog, extending the autophagy role to mammalian cells.","evidence":"cDNA cloning of human ATG5 with sequence homology and Northern blot expression analysis","pmids":["9563500"],"confidence":"Medium","gaps":["Functional validation in human cells indirect","No partner or complex identified"]},{"year":2001,"claim":"Resolved where and when ATG5 acts, showing the ATG12–ATG5 conjugate marks the elongating isolation membrane and is needed for LC3 targeting.","evidence":"GFP-ATG5 live imaging, ATG5-knockout mouse ES cells, immunofluorescence and electron microscopy","pmids":["11266458"],"confidence":"High","gaps":["Catalytic mechanism of LC3 conjugation not defined","Role of conjugation versus targeting partially separated"]},{"year":2002,"claim":"Defined the higher-order complex architecture by showing ATG16 oligomerization assembles a multimeric ATG12–ATG5–ATG16 complex essential for activity.","evidence":"In vivo oligomerization control system, size-exclusion chromatography, autophagy assays in yeast","pmids":["11897782"],"confidence":"High","gaps":["Mammalian complex stoichiometry not addressed","How oligomerization couples to lipidation unknown"]},{"year":2003,"claim":"Identified ATG16L1 as the mammalian partner forming the ~800 kDa complex and mapped ATG5-dependent membrane targeting.","evidence":"Co-immunoprecipitation, size-exclusion chromatography, immunofluorescence and domain-deletion analysis in mouse cells","pmids":["12665549"],"confidence":"High","gaps":["WD-domain function unresolved at this stage","Catalytic basis of E3-like activity not shown"]},{"year":2009,"claim":"Revealed that autophagosomes can form without ATG5 via an LC3-lipidation-independent, Rab9-dependent alternative pathway, distinguishing canonical from alternative macroautophagy.","evidence":"ATG5- and ATG7-knockout mouse cells, electron microscopy, LC3 lipidation assays, in vivo erythroid maturation","pmids":["19794493"],"confidence":"High","gaps":["Molecular machinery of the alternative pathway incomplete","Physiological triggers selecting each pathway unclear"]},{"year":2013,"claim":"Uncovered an autophagy-independent nuclear function in which ATG5 binds survivin to trigger mitotic catastrophe after DNA damage.","evidence":"Nuclear fractionation, ATG5–survivin co-IP, pharmacological autophagy inhibition, patient carcinoma immunohistochemistry","pmids":["23945651"],"confidence":"High","gaps":["Signal driving ATG5 nuclear translocation unknown","Structural basis of ATG5–survivin binding undefined"]},{"year":2016,"claim":"Linked ATG5 directly to human disease, showing a conjugation-impairing missense mutation causes congenital ataxia with intellectual disability.","evidence":"Human genetics, autophagy flux and ATG12–ATG5 conjugation assays in patient cells, yeast and Drosophila models","pmids":["26812546"],"confidence":"High","gaps":["Tissue-specific basis of neurological phenotype unresolved","Whether non-autophagic ATG5 roles contribute not tested"]},{"year":2016,"claim":"Connected ATG5-dependent autophagy to cell-cycle control and differentiation through autophagy-competence-dependent rescue and substrate degradation.","evidence":"Conditional knockout mice, ATG5 K130R autophagy-incompetent mutant rescue, SOCS2/STAT3 epistasis, flow cytometry and immunofluorescence","pmids":["27304991","25227738"],"confidence":"High","gaps":["Direct mechanism coupling autophagy to G2/M arrest unclear","Generality across tissues not established"]},{"year":2017,"claim":"Identified upstream regulators (RACK1, GTP-RAB37) and a transcriptional pathway (p73-DAPK2) that promote ATG5 complex assembly and stimulus-specific autophagy.","evidence":"Co-immunoprecipitation, GTP/GDP and binding-deficient mutants, knockdown, LC3 lipidation and APL cell assays","pmids":["27325703","29229996","28978663"],"confidence":"Medium","gaps":["Single-lab interaction studies","Hierarchy among these regulators unknown"]},{"year":2018,"claim":"Separated canonical autophagy from non-canonical pathways by domain dissection and revealed ATG5's role in immune-synapse organization.","evidence":"ATG16L1 domain-deletion mouse knockins, conditional B-cell ATG5 KO, immunofluorescence, ATG16L1–PCM1 co-IP and antigen-presentation assays","pmids":["30403914","30196744"],"confidence":"High","gaps":["Molecular link between complex and centrosome relocalization incomplete","WD-domain LAP mechanism not fully defined"]},{"year":2019,"claim":"Demonstrated ATG5-dependent autophagy restrains inflammatory and lipid-handling programs in tubular and dendritic cells.","evidence":"Conditional KO mice, ATG5–p65 co-IP, ATG5 K130R mutant, CD36 blockade and T-cell priming assays","pmids":["30874544","30900506"],"confidence":"High","gaps":["Whether p65 is an autophagy substrate or binding partner not resolved","Mechanism of CD36 regulation incomplete"]},{"year":2022,"claim":"Defined post-translational stability control of ATG5 through opposing ubiquitination by HACE1 and deubiquitination by USP22, coupling ATG5 levels to inflammasome and chemotherapy responses.","evidence":"Co-IP, ubiquitination site mapping (K63; K118 with K27/K48 chains), ChIP, knockdown/knockout and inflammasome assays","pmids":["35900990","40126194"],"confidence":"Medium","gaps":["Single-lab site-mapping studies","Interplay between competing modifications in vivo unclear"]},{"year":2023,"claim":"Reconstituted the E3-like complex's biochemical activity and uncovered ATG16L1-independent and conjugation-independent functions at lysosomes and the plasma membrane.","evidence":"In vitro reconstitution with purified complex and liposome tethering/lipid-mixing assays; TECPR1–ATG12–ATG5 co-IP with double KO; ATG5–BST2 co-IP with phospho/dimerization and conjugation-deficient mutants; ATG12–ATG3–ALIX co-IP across ATG KO lines","pmids":["37062893","37381828","37155854","37054706"],"confidence":"High","gaps":["Structural switch between tethering and fusion not defined","Selection between ATG16L1 and TECPR1 routes context-dependent and incompletely mapped"]},{"year":2024,"claim":"Extended ATG5's autophagic and non-autophagic roles to spermine metabolism, lipophagy-driven ferroptosis, and calpain-regulated cardiac injury.","evidence":"Co-IP with SMOX and perilipin3, knockdown/knockout models, spermine and lipidomic measurements, diabetic I/R model with ATG5/LAMP2 overexpression","pmids":["38775007","39636725","36562207"],"confidence":"Medium","gaps":["Single-lab interaction studies","Direct versus indirect basis of metabolic effects unresolved"]},{"year":2025,"claim":"Established an autophagy-independent neutrophil function in which ATG5 suppresses type I interferon-driven NET release and CXCL2-mediated swarming during infection.","evidence":"Atg5fl/fl-LysM-Cre conditional KO mice, in vivo and in vitro M. tuberculosis infection, PAD4 citrullination, NET and CXCL2 assays","pmids":["40374743"],"confidence":"High","gaps":["Molecular target of ATG5 in the IFN/PAD4 axis unidentified","Whether this requires ATG5 conjugation not tested"]},{"year":null,"claim":"How a single protein partitions between its canonical conjugation-dependent E3-like role and its multiple conjugation- and ATG16L1-independent functions remains the central open question.","evidence":"","pmids":[],"confidence":"High","gaps":["No unifying structural model for partner switching (ATG16L1 vs TECPR1 vs survivin vs BST2)","Signals dictating nuclear versus membrane versus complex localization unknown","Relative in vivo contribution of non-canonical functions to disease unquantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,23,21]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[23,21]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,22,20]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[21,20]},{"term_id":"GO:0005886","term_label":"plasma 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Conjugation with ATG12, through a ubiquitin-like conjugating system involving ATG7 as an E1-like activating enzyme and ATG10 as an E2-like conjugating enzyme, is essential for its function. The ATG12-ATG5 conjugate acts as an E3-like enzyme which is required for lipidation of ATG8 family proteins and their association to the vesicle membranes. Involved in mitochondrial quality control after oxidative damage, and in subsequent cellular longevity. Plays a critical role in multiple aspects of lymphocyte development and is essential for both B and T lymphocyte survival and proliferation. Required for optimal processing and presentation of antigens for MHC II. Involved in the maintenance of axon morphology and membrane structures, as well as in normal adipocyte differentiation. Promotes primary ciliogenesis through removal of OFD1 from centriolar satellites and degradation of IFT20 via the autophagic pathway. As part of the ATG8 conjugation system with ATG12 and ATG16L1, required for recruitment of LRRK2 to stressed lysosomes and induction of LRRK2 kinase activity in response to lysosomal stress (By similarity) May play an important role in the apoptotic process, possibly within the modified cytoskeleton. Its expression is a relatively late event in the apoptotic process, occurring downstream of caspase activity. Plays a crucial role in IFN-gamma-induced autophagic cell death by interacting with FADD (Microbial infection) May act as a proviral factor. In association with ATG12, negatively regulates the innate antiviral immune response by impairing the type I IFN production pathway upon vesicular stomatitis virus (VSV) infection (PubMed:17709747). 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ATG12–ATG5 is also required for targeting of the mammalian ATG8 homolog LC3 to isolation membranes.\",\n      \"method\": \"GFP-tagged ATG5 live imaging, ATG5-deficient mouse embryonic stem cells (genetic knockout), immunofluorescence, electron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (live imaging, KO cells, LC3 targeting assay) in a single rigorous study; widely replicated\",\n      \"pmids\": [\"11266458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"In yeast, the APG12–APG5 conjugate and APG16 form an ~350 kDa multimeric complex; this complex formation, mediated by APG16 homo-oligomerization, is essential for autophagic activity.\",\n      \"method\": \"In vivo oligomerization control system, size-exclusion chromatography, autophagy activity assays in yeast\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo oligomerization system with direct functional readout, yeast ortholog study closely mirroring mammalian complex\",\n      \"pmids\": [\"11897782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Mouse ATG16L (Apg16L) is a novel WD-repeat protein that interacts with ATG5 (and with additional ATG16L monomers) to form an ~800 kDa complex containing the ATG12–ATG5 conjugate; this complex associates with the autophagic isolation membrane. Membrane targeting of ATG16L requires ATG5 but not ATG12. The WD-repeat domain is not required for ATG5 binding or ATG16L oligomerization.\",\n      \"method\": \"Co-immunoprecipitation, size-exclusion chromatography, immunofluorescence localization, domain-deletion analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, domain mapping, and localization studies; independently corroborated\",\n      \"pmids\": [\"12665549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mouse cells lacking ATG5 or ATG7 can still form autophagosomes/autolysosomes and perform autophagy-mediated protein degradation under certain stresses via an alternative macroautophagy pathway. This ATG5/ATG7-independent alternative autophagy does not involve LC3 lipidation but is Rab9-dependent, and autophagosomes are generated by fusion of isolation membranes with vesicles from the trans-Golgi and late endosomes.\",\n      \"method\": \"ATG5-knockout and ATG7-knockout mouse cells, electron microscopy, LC3 lipidation assays, Rab9 dependency analysis, in vivo erythroid maturation studies\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO in multiple cell types, multiple orthogonal methods, in vivo corroboration; published in top-tier journal\",\n      \"pmids\": [\"19794493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ATG5 translocates to the nucleus in response to DNA-damaging agents (etoposide, cisplatin) where it physically interacts with survivin, displacing elements of the chromosomal passenger complex and causing chromosome misalignment and mitotic catastrophe independently of autophagy.\",\n      \"method\": \"Nuclear fractionation, co-immunoprecipitation (ATG5–survivin interaction), pharmacological autophagy inhibition, immunohistochemistry in patient carcinoma tissues\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP confirmed in vitro and in patient tissues, autophagy-independent mechanism validated pharmacologically, multiple orthogonal methods\",\n      \"pmids\": [\"23945651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ATG5-mediated autophagy promotes astrocyte differentiation in the developing mouse cortex by degrading the inhibitory protein SOCS2, thereby activating the JAK2-STAT3 pathway; the differentiation defect from ATG5 loss can be rescued by SOCS2 knockdown or STAT3 overexpression.\",\n      \"method\": \"In vivo conditional knockout, in vitro ATG5 overexpression and knockdown, epistasis rescue experiments (SOCS2 KD, STAT3 OE), immunofluorescence\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (SOCS2 knockdown rescue), in vivo and in vitro evidence, two orthogonal methods, single lab\",\n      \"pmids\": [\"25227738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A homozygous missense mutation in ATG5 in human patients causes congenital ataxia with mental retardation; patient cells display decreased autophagy flux and defects in conjugation of ATG12 to ATG5. The homologous yeast mutation reduces autophagy 30–50%, and flies expressing the mutant human ATG5 exhibit severe movement disorder.\",\n      \"method\": \"Human genetics (homozygous patient mutation), autophagy flux assay in patient cells, ATG12–ATG5 conjugation assay, yeast homologous mutation, Drosophila substitution experiments\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — human disease mutation validated across three model systems with direct biochemical (conjugation) and functional (flux) readouts\",\n      \"pmids\": [\"26812546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Proximal tubule-specific deletion of ATG5 in mice causes marked G2/M cell cycle arrest and severe renal fibrosis; overexpression of wild-type ATG5, but not the autophagy-incompetent ATG5 K130R mutant, rescues G2/M arrest, demonstrating that ATG5 regulates cell cycle progression in an autophagy-dependent manner.\",\n      \"method\": \"Conditional knockout mice (UUO model), primary tubular cell culture, ATG5 K130R mutant rescue experiment, flow cytometry cell-cycle analysis, Western blot\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined phenotype plus autophagy-incompetent point-mutant rescue, two orthogonal methods, single lab\",\n      \"pmids\": [\"27304991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RACK1 (GNB2L1) is a novel ATG5-interacting protein; RACK1–ATG5 interaction is stimulated by canonical autophagy inducers (starvation, mTOR inhibition) and is required for autophagy activation, as RACK1 knockdown or prevention of its binding to ATG5 by mutagenesis blocks autophagy.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis preventing RACK1–ATG5 binding, RACK1 knockdown, multiple independent interaction techniques\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple independent interaction assays plus mutagenesis and KD phenotype, single lab\",\n      \"pmids\": [\"27325703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RAB37, when GTP-bound, directly binds ATG5 and promotes formation of the ATG5–ATG12–ATG16L1 complex on the isolation membrane, facilitating LC3B lipidation and autophagosome formation; GDP-stabilized RAB37 impairs this interaction.\",\n      \"method\": \"Co-immunoprecipitation, mutation analysis (GTP/GDP forms), LC3B lipidation assay, autophagosome formation assay, ATG16L1 interaction assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding shown with GTPase mutant controls and functional downstream readout, single lab\",\n      \"pmids\": [\"29229996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DAPK2 interacts with ATG5 and this interaction is essential for ATRA-induced autophagy in APL cells; TP73-mediated transcription of DAPK2 drives the p73-DAPK2-ATG5 pathway for autophagy. In contrast, DAPK2 mediates ATO-induced apoptosis independently of ATG5.\",\n      \"method\": \"Co-immunoprecipitation (DAPK2–ATG5 interaction), DAPK2 and TP73 siRNA knockdown, pathway epistasis, APL cell treatment assays\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus pathway epistasis via siRNA, single lab\",\n      \"pmids\": [\"28978663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATG5 is required for BCR polarization, centrosome relocalization to the immune synapse, and actin nucleation in B cells after BCR stimulation; the ATG12–ATG5–ATG16L1 complex interacts with the centrosome-associated protein PCM1, which is required for BCR polarization and MHC class II antigen presentation of particulate antigens.\",\n      \"method\": \"ATG5-conditional B cell knockout mice, immunofluorescence (BCR polarization, centrosome, actin), co-immunoprecipitation (ATG16L1–PCM1), T cell priming assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO plus co-IP identifying complex, defined cellular phenotype, single lab with multiple readouts\",\n      \"pmids\": [\"30196744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The ATG5-binding and coiled-coil domains of ATG16L1 are sufficient for canonical autophagy and tissue homeostasis in mice, whereas the WD domain of ATG16L1 is specifically required for LC3-associated phagocytosis (LAP) but not for canonical autophagy.\",\n      \"method\": \"Domain-deletion mouse models (WD-domain deletion, coiled-coil E230 deletion), autophagy cargo assays (LC3, p62), tissue histology, SQSTM1 inclusion analysis\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-specific mouse knockins with multiple tissue and biochemical readouts distinguishing autophagy from LAP\",\n      \"pmids\": [\"30403914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ATG5-mediated autophagy in proximal tubular epithelial cells suppresses NF-κB signaling: ATG5 co-immunoprecipitates with NF-κB p65, and ATG5 (but not autophagy-incompetent ATG5 K130R mutant) reduces angiotensin II-induced phosphorylation and nuclear translocation of p65, thereby reducing pro-inflammatory cytokine production.\",\n      \"method\": \"Conditional tubule-specific ATG5 KO mice, co-immunoprecipitation (ATG5–p65), immunofluorescence colocalization, siRNA knockdown, ATG5 K130R mutant, UUO in vivo model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP confirming physical ATG5–p65 interaction, autophagy-incompetent mutant control, in vivo and in vitro corroboration; two orthogonal methods\",\n      \"pmids\": [\"30874544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ATG5 regulates CD36 expression and MHC class II antigen presentation in dendritic cells: ATG5 deletion leads to elevated CD36 expression and excessive lipid accumulation, causing increased phagocytosis of apoptotic tumor cells but reduced CD4+ T cell priming.\",\n      \"method\": \"Dendritic cell-specific ATG5 conditional knockout mice, CD36 blockade experiments, T cell priming assays, lipid accumulation assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined pathway mechanism (CD36 blockade rescue), single lab\",\n      \"pmids\": [\"30900506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Calpain-mediated proteolytic cleavage of ATG5 (and LAMP2) during diabetic myocardial ischemia-reperfusion injury impairs autophagic flux; calpain inhibition restores ATG5 levels and co-overexpression of ATG5 and LAMP2 reduces myocardial injury and normalizes autophagic flux.\",\n      \"method\": \"STZ-induced diabetic mouse I/R model, calpain inhibition, co-overexpression of ATG5+LAMP2, Western blot, LC3/p62 flux assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — calpain inhibition plus ATG5/LAMP2 overexpression rescue in vivo and in vitro, single lab\",\n      \"pmids\": [\"36562207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP22 stabilizes ATG5 by removing K27- and K48-linked ubiquitin chains at Lys118, thereby preventing ATG5 degradation and promoting ATG5-mediated autophagy to suppress NLRP3 inflammasome activation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination site mapping (K118), USP22 knockdown/knockout, NLRP3 inflammasome activation assays, in vivo inflammation models\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination site identified with functional rescue, single lab, multiple methods\",\n      \"pmids\": [\"35900990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A hydrocarbon-stapled peptide derived from ATG16L1 binds ATG5 with high affinity, resists proteolysis, and inhibits autophagy in cells by disrupting the ATG5–ATG16L1 protein-protein interaction.\",\n      \"method\": \"Stapled peptide synthesis, binding affinity assay, proteolysis resistance assay, cell-based autophagy inhibition assay\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding measurement plus cellular functional readout; validates ATG5–ATG16L1 PPI as druggable, single lab\",\n      \"pmids\": [\"36107218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ATG5, in the absence of other canonical autophagy ATGs, prevents lysosomal exocytosis and excessive secretion of extracellular vesicles; loss of ATG5 (but not other canonical ATGs) promotes lysosomal disrepair. An alternative conjugation complex, ATG12–ATG3, sequesters ESCRT protein ALIX in ATG5 KO cells, impairing membrane repair and exosome secretion. In murine neutrophils, ATG5 loss causes excessive degranulation.\",\n      \"method\": \"ATG5 and other ATG knockout human cell lines, lysosomal exocytosis assay, extracellular vesicle secretion assay, ATG12–ATG3–ALIX co-immunoprecipitation, murine Atg5fl/fl LysM-Cre neutrophil degranulation assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple ATG KO lines distinguishing ATG5-specific function, co-IP identifying ATG12-ATG3-ALIX complex, in vivo corroboration, two orthogonal methods\",\n      \"pmids\": [\"37054706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TECPR1 forms an alternative E3-like conjugation complex with the ATG12–ATG5 conjugate at damaged lysosomes that regulates ATG16L1-independent unconventional LC3 lipidation; TECPR1 recruitment to damaged membranes occurs via its N-terminal dysferlin domain and precedes lysophagy induction. Double knockout of ATG16L1 and TECPR1 abolishes LC3 lipidation and impairs lysosomal recovery.\",\n      \"method\": \"Co-immunoprecipitation (TECPR1–ATG12–ATG5 complex), domain deletion analysis (dysferlin domain), ATG16L1/TECPR1 double knockout, LC3 lipidation assays, lysosomal damage recovery assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — complex co-IP with domain mapping, double KO epistasis, direct functional readout; multiple orthogonal methods\",\n      \"pmids\": [\"37381828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ATG5 specifically recognizes cysteine-linked homodimerized, phosphorylated BST2/tetherin that is tethering HIV-1 virions at the plasma membrane; ATG5 and BST2 form a complex independently of Vpu and ahead of LC3C recruitment, initiating an LC3C-associated pathway. ATG12 conjugation to ATG5 is dispensable for this BST2 interaction.\",\n      \"method\": \"Co-immunoprecipitation (ATG5–BST2 complex), BST2 phosphorylation/dimerization mutants, Vpu-independent complex formation assay, ATG12–ATG5 conjugation-deficient mutant analysis, LC3C recruitment assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP with multiple biochemical mutant controls (phospho-BST2, ATG12-conjugation mutant), mechanistic pathway ordering established, multiple orthogonal methods\",\n      \"pmids\": [\"37155854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The ATG12–ATG5–ATG16L1 complex (E3) increases and accelerates LC3/GABARAP lipidation and promotes vesicle tethering but inhibits LC3/GABARAP-induced inter-vesicular lipid mixing/fusion, suggesting the complex regulates phagophore expansion by modulating tethering versus fusion activities.\",\n      \"method\": \"In vitro reconstitution with purified ATG12–ATG5–ATG16L1 complex, liposome-based LC3 lipidation assay, vesicle tethering and lipid mixing assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified complex and quantitative functional assays; single lab but multiple orthogonal in vitro readouts\",\n      \"pmids\": [\"37062893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATG5 in neutrophils suppresses type I interferon-induced PAD4-mediated histone citrullination and NET release, and suppresses type I IFN-induced CXCL2 secretion and neutrophil swarming during M. tuberculosis infection; this function is autophagy-independent.\",\n      \"method\": \"Atg5fl/fl-LysM-Cre conditional KO mice, in vivo and in vitro Mtb infection, PAD4 citrullination assay, NET release assay, CXCL2 secretion assay, type I IFN pathway analysis\",\n      \"journal\": \"Nature microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple defined mechanistic readouts in vivo and in vitro; published in high-quality journal, multiple orthogonal methods\",\n      \"pmids\": [\"40374743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HACE1 E3 ubiquitin ligase promotes K63-linked ubiquitination of ATG5, leading to its proteasomal degradation; HMBOX1 transcriptionally upregulates HACE1, thereby reducing ATG5 protein levels and inhibiting autophagy to sensitize colorectal cancer cells to 5-fluorouracil.\",\n      \"method\": \"Mass-spectrometry proteomics, co-immunoprecipitation, ubiquitination site mapping (K63), ChIP assay (HMBOX1 on HACE1 promoter), in vivo xenograft, single-cell RNA sequencing\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination site identified with co-IP and functional rescue, ChIP for upstream transcriptional mechanism, single lab\",\n      \"pmids\": [\"40126194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ATG5 interacts with SMOX (spermine oxidase) under physiological conditions and during TGF-β1-induced fibrogenesis, preserving cellular spermine levels; ATG5 downregulation increases SMOX expression and reduces spermine, promoting renal senescence and fibrosis.\",\n      \"method\": \"Co-immunoprecipitation (ATG5–SMOX), ATG5 knockdown in tubular epithelial cells, SMOX genetic knockout mice, spermine measurement, fibrosis assays in vivo\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP showing direct ATG5–SMOX interaction, genetic models both in vitro and in vivo, single lab\",\n      \"pmids\": [\"38775007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ATG5 mediates lipophagy in corneal epithelial cells under hyperosmotic stress by interacting with perilipin3 (confirmed by co-immunoprecipitation and immunofluorescence); this lipophagy increases free fatty acid levels and lipid peroxidation, driving ferroptosis. ATG5 inhibition ameliorates corneal damage and suppresses ferroptosis in a dry eye mouse model.\",\n      \"method\": \"Co-immunoprecipitation (ATG5–perilipin3), immunofluorescence colocalization, siRNA-mediated ATG5 inhibition in vivo (cholesterol-modified siRNA), lipidomics, ferroptosis marker assays, transmission electron microscopy\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP identifying ATG5–perilipin3 interaction, in vivo knockdown with functional ferroptosis readout, single lab\",\n      \"pmids\": [\"39636725\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATG5 is a core autophagy protein that forms a covalent conjugate with ATG12 and then assembles with ATG16L1 into a large (~800 kDa) E3-like ligase complex that localizes to the phagophore/isolation membrane, where it catalyzes lipidation (PE-conjugation) of LC3/ATG8 proteins to drive autophagosome expansion; beyond canonical autophagy, ATG5 has autophagy-independent functions including nuclear translocation to interact with survivin and trigger mitotic catastrophe, acting as a signaling scaffold at the plasma membrane to engage phosphorylated BST2 and initiate an LC3C-associated pathway, and suppressing type I interferon-driven NET release and CXCL2 secretion in neutrophils, while its activity is regulated by post-translational modifications including USP22-mediated deubiquitination at K118 and calpain-mediated cleavage.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ATG5 is a core autophagy effector that, after covalent conjugation to ATG12, assembles with ATG16L1 into a large (~800 kDa) E3-like complex on the autophagic isolation membrane to drive LC3/ATG8 lipidation and autophagosome formation [#2, #4, #23]. The pathway is evolutionarily conserved from yeast APG5, where it is essential for starvation-induced autophagy [#0], to mammals, where the ATG12–ATG5 conjugate and the ATG16L1 oligomer co-localize to the elongating isolation membrane and are required for LC3 targeting and membrane elongation [#2, #3, #4]. In reconstitution, the purified ATG12–ATG5–ATG16L1 complex accelerates LC3/GABARAP lipidation and tethers vesicles while restraining inter-vesicular fusion, positioning it as the regulator of phagophore expansion [#23]; conjugation of ATG12 to ATG5 is dispensable for membrane targeting but required for elongation [#2]. ATG5 activity is gated by post-translational control: HACE1 directs K63-linked ubiquitination driving proteasomal degradation, USP22 removes K27/K48 chains at Lys118 to stabilize the protein, and calpain cleaves ATG5 to impair autophagic flux under ischemic stress [#25, #18, #17]. Beyond canonical autophagy, ATG5 acts independently of the conjugation machinery in several settings: it engages alternative E3-like partners such as TECPR1 to drive ATG16L1-independent LC3 lipidation at damaged lysosomes [#21], translocates to the nucleus to bind survivin and trigger mitotic catastrophe after DNA damage [#6], recognizes phosphorylated dimerized BST2/tetherin at the plasma membrane to initiate an LC3C-associated pathway against HIV-1 [#22], and restrains type I interferon-driven NET release and CXCL2 secretion in neutrophils during M. tuberculosis infection [#24]. ATG5-dependent autophagy further shapes cell-fate and immune outcomes by degrading SOCS2 to license JAK2-STAT3-driven astrocyte differentiation [#7], suppressing NF-κB and NLRP3 inflammasome signaling [#15, #18], and controlling lysosomal exocytosis and extracellular-vesicle secretion via an ATG12–ATG3–ALIX axis [#20]. A homozygous missense ATG5 mutation that impairs ATG12 conjugation and autophagy flux causes congenital ataxia with intellectual disability in humans [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established that the ATG5 gene product is genetically required for autophagy, defining its foundational loss-of-function phenotype.\",\n      \"evidence\": \"Yeast APG5 null mutant with complementation and microscopic scoring of autophagic bodies under nitrogen starvation\",\n      \"pmids\": [\"8921905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No molecular mechanism for how APG5 acts on membranes\", \"Mammalian relevance not yet shown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identified the human ortholog, extending the autophagy role to mammalian cells.\",\n      \"evidence\": \"cDNA cloning of human ATG5 with sequence homology and Northern blot expression analysis\",\n      \"pmids\": [\"9563500\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional validation in human cells indirect\", \"No partner or complex identified\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Resolved where and when ATG5 acts, showing the ATG12–ATG5 conjugate marks the elongating isolation membrane and is needed for LC3 targeting.\",\n      \"evidence\": \"GFP-ATG5 live imaging, ATG5-knockout mouse ES cells, immunofluorescence and electron microscopy\",\n      \"pmids\": [\"11266458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic mechanism of LC3 conjugation not defined\", \"Role of conjugation versus targeting partially separated\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the higher-order complex architecture by showing ATG16 oligomerization assembles a multimeric ATG12–ATG5–ATG16 complex essential for activity.\",\n      \"evidence\": \"In vivo oligomerization control system, size-exclusion chromatography, autophagy assays in yeast\",\n      \"pmids\": [\"11897782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian complex stoichiometry not addressed\", \"How oligomerization couples to lipidation unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified ATG16L1 as the mammalian partner forming the ~800 kDa complex and mapped ATG5-dependent membrane targeting.\",\n      \"evidence\": \"Co-immunoprecipitation, size-exclusion chromatography, immunofluorescence and domain-deletion analysis in mouse cells\",\n      \"pmids\": [\"12665549\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"WD-domain function unresolved at this stage\", \"Catalytic basis of E3-like activity not shown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed that autophagosomes can form without ATG5 via an LC3-lipidation-independent, Rab9-dependent alternative pathway, distinguishing canonical from alternative macroautophagy.\",\n      \"evidence\": \"ATG5- and ATG7-knockout mouse cells, electron microscopy, LC3 lipidation assays, in vivo erythroid maturation\",\n      \"pmids\": [\"19794493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular machinery of the alternative pathway incomplete\", \"Physiological triggers selecting each pathway unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Uncovered an autophagy-independent nuclear function in which ATG5 binds survivin to trigger mitotic catastrophe after DNA damage.\",\n      \"evidence\": \"Nuclear fractionation, ATG5–survivin co-IP, pharmacological autophagy inhibition, patient carcinoma immunohistochemistry\",\n      \"pmids\": [\"23945651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal driving ATG5 nuclear translocation unknown\", \"Structural basis of ATG5–survivin binding undefined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked ATG5 directly to human disease, showing a conjugation-impairing missense mutation causes congenital ataxia with intellectual disability.\",\n      \"evidence\": \"Human genetics, autophagy flux and ATG12–ATG5 conjugation assays in patient cells, yeast and Drosophila models\",\n      \"pmids\": [\"26812546\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific basis of neurological phenotype unresolved\", \"Whether non-autophagic ATG5 roles contribute not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected ATG5-dependent autophagy to cell-cycle control and differentiation through autophagy-competence-dependent rescue and substrate degradation.\",\n      \"evidence\": \"Conditional knockout mice, ATG5 K130R autophagy-incompetent mutant rescue, SOCS2/STAT3 epistasis, flow cytometry and immunofluorescence\",\n      \"pmids\": [\"27304991\", \"25227738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism coupling autophagy to G2/M arrest unclear\", \"Generality across tissues not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified upstream regulators (RACK1, GTP-RAB37) and a transcriptional pathway (p73-DAPK2) that promote ATG5 complex assembly and stimulus-specific autophagy.\",\n      \"evidence\": \"Co-immunoprecipitation, GTP/GDP and binding-deficient mutants, knockdown, LC3 lipidation and APL cell assays\",\n      \"pmids\": [\"27325703\", \"29229996\", \"28978663\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interaction studies\", \"Hierarchy among these regulators unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Separated canonical autophagy from non-canonical pathways by domain dissection and revealed ATG5's role in immune-synapse organization.\",\n      \"evidence\": \"ATG16L1 domain-deletion mouse knockins, conditional B-cell ATG5 KO, immunofluorescence, ATG16L1–PCM1 co-IP and antigen-presentation assays\",\n      \"pmids\": [\"30403914\", \"30196744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between complex and centrosome relocalization incomplete\", \"WD-domain LAP mechanism not fully defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated ATG5-dependent autophagy restrains inflammatory and lipid-handling programs in tubular and dendritic cells.\",\n      \"evidence\": \"Conditional KO mice, ATG5–p65 co-IP, ATG5 K130R mutant, CD36 blockade and T-cell priming assays\",\n      \"pmids\": [\"30874544\", \"30900506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether p65 is an autophagy substrate or binding partner not resolved\", \"Mechanism of CD36 regulation incomplete\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined post-translational stability control of ATG5 through opposing ubiquitination by HACE1 and deubiquitination by USP22, coupling ATG5 levels to inflammasome and chemotherapy responses.\",\n      \"evidence\": \"Co-IP, ubiquitination site mapping (K63; K118 with K27/K48 chains), ChIP, knockdown/knockout and inflammasome assays\",\n      \"pmids\": [\"35900990\", \"40126194\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab site-mapping studies\", \"Interplay between competing modifications in vivo unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Reconstituted the E3-like complex's biochemical activity and uncovered ATG16L1-independent and conjugation-independent functions at lysosomes and the plasma membrane.\",\n      \"evidence\": \"In vitro reconstitution with purified complex and liposome tethering/lipid-mixing assays; TECPR1–ATG12–ATG5 co-IP with double KO; ATG5–BST2 co-IP with phospho/dimerization and conjugation-deficient mutants; ATG12–ATG3–ALIX co-IP across ATG KO lines\",\n      \"pmids\": [\"37062893\", \"37381828\", \"37155854\", \"37054706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural switch between tethering and fusion not defined\", \"Selection between ATG16L1 and TECPR1 routes context-dependent and incompletely mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended ATG5's autophagic and non-autophagic roles to spermine metabolism, lipophagy-driven ferroptosis, and calpain-regulated cardiac injury.\",\n      \"evidence\": \"Co-IP with SMOX and perilipin3, knockdown/knockout models, spermine and lipidomic measurements, diabetic I/R model with ATG5/LAMP2 overexpression\",\n      \"pmids\": [\"38775007\", \"39636725\", \"36562207\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interaction studies\", \"Direct versus indirect basis of metabolic effects unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established an autophagy-independent neutrophil function in which ATG5 suppresses type I interferon-driven NET release and CXCL2-mediated swarming during infection.\",\n      \"evidence\": \"Atg5fl/fl-LysM-Cre conditional KO mice, in vivo and in vitro M. tuberculosis infection, PAD4 citrullination, NET and CXCL2 assays\",\n      \"pmids\": [\"40374743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of ATG5 in the IFN/PAD4 axis unidentified\", \"Whether this requires ATG5 conjugation not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single protein partitions between its canonical conjugation-dependent E3-like role and its multiple conjugation- and ATG16L1-independent functions remains the central open question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unifying structural model for partner switching (ATG16L1 vs TECPR1 vs survivin vs BST2)\", \"Signals dictating nuclear versus membrane versus complex localization unknown\", \"Relative in vivo contribution of non-canonical functions to disease unquantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 23, 21]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [23, 21]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 22, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005776\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [21, 20]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [22]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 2, 4, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [22, 24, 18, 16]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6, 9]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"complexes\": [\n      \"ATG12–ATG5–ATG16L1 E3-like complex\",\n      \"TECPR1–ATG12–ATG5 alternative conjugation complex\",\n      \"ATG12–ATG3–ALIX complex\"\n    ],\n    \"partners\": [\n      \"ATG12\",\n      \"ATG16L1\",\n      \"TECPR1\",\n      \"BST2\",\n      \"RACK1\",\n      \"RAB37\",\n      \"DAPK2\",\n      \"SMOX\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}