{"gene":"ATP6V0A1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1992,"finding":"The yeast VPH1 gene (ortholog of human ATP6V0A1) encodes a 95-kDa integral membrane polypeptide of the V0 domain that is essential for vacuolar H+-ATPase assembly and vacuolar acidification. Loss of VPH1 abolishes bafilomycin-sensitive ATPase activity and ATP-dependent proton pumping in vacuoles, and causes the peripheral nucleotide-binding subunits (60 and 69 kDa) of the V-ATPase to dissociate from vacuolar membranes, demonstrating that Vph1p is required for V1 domain attachment to the membrane V0 domain.","method":"Genetic deletion/complementation, vacuolar ATPase activity assays, proton pumping assays, cell fractionation, immunodetection, antibody library screening","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal biochemical assays (ATPase activity, proton pumping, fractionation) plus genetic complementation in yeast ortholog; foundational study replicated across field","pmids":["1385813"],"is_preprint":false},{"year":1997,"finding":"The V-ATPase is a multisubunit complex composed of a peripheral V1 domain (responsible for ATP hydrolysis, subunits A–H) and an integral V0 domain (responsible for proton translocation, subunits a–d). The 'a' subunit (the ortholog of ATP6V0A1) resides in the V0 domain and is required for proton translocation. Assembly of V1 onto V0 is a regulated process, and the 'a' subunit isoforms determine organelle targeting.","method":"Biochemical reconstitution, genetic analysis, subunit mutagenesis studies reviewed","journal":"Annual review of cell and developmental biology","confidence":"High","confidence_rationale":"Tier 1 — comprehensive review synthesizing reconstitution, genetics, and mutagenesis from multiple laboratories; foundational mechanistic framework","pmids":["9442887"],"is_preprint":false},{"year":2001,"finding":"In Cryptococcus neoformans, disruption of VPH1 (ortholog of ATP6V0A1) results in defects in multiple virulence factors (capsule production, laccase activity, urease expression) and a growth defect at 37°C, phenocopied by the V-ATPase inhibitor bafilomycin A1. These defects are rescued by complementation with wild-type VPH1, establishing that Vph1p-dependent vesicular acidification is required for proper protein secretion, metal cofactor insertion (for laccase), and glycosylation processes in vivo.","method":"Insertional mutagenesis, plasmid rescue, complementation, bafilomycin A1 inhibition, virulence assays in mouse model","journal":"Molecular microbiology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with complementation rescue, multiple phenotypic readouts, pharmacological corroboration with bafilomycin","pmids":["11737651"],"is_preprint":false},{"year":2002,"finding":"V-ATPases are the primary drivers of intracellular compartment acidification in eukaryotes. The 'a' subunit isoforms of the V0 domain (including the a1 isoform encoded by ATP6V0A1) determine the specific organelle targeting of the V-ATPase complex, with different isoforms directing the pump to distinct intracellular compartments (e.g., lysosomes, Golgi, synaptic vesicles). This isoform-based targeting underlies compartment-specific acidification.","method":"Biochemical and genetic analysis reviewed; isoform-specific localization studies","journal":"Nature reviews. Molecular cell biology","confidence":"High","confidence_rationale":"Tier 2 — synthesis of multiple independent biochemical and genetic studies establishing isoform-specific targeting; widely replicated","pmids":["11836511"],"is_preprint":false},{"year":2007,"finding":"The a1 isoform (ATP6V0A1) of the V-ATPase V0 domain is expressed in the mouse kidney and localizes to both the apical and basolateral membranes of intercalated cells of the collecting system, as well as to the proximal tubule. In intercalated cells, a1 co-localizes with both AE1 (type A intercalated cells) and pendrin (type B intercalated cells), unlike the a2 isoform which is absent from pendrin-expressing cells. This differential localization suggests that V-ATPases containing different 'a' subunit isoforms serve distinct physiological roles along the nephron.","method":"Real-time PCR for expression quantification, immunolocalization with isoform-specific antibodies in mouse kidney sections","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct immunolocalization experiment with functional interpretation; single study but multiple isoforms compared systematically","pmids":["17595521"],"is_preprint":false},{"year":2011,"finding":"In yeast, loss of VPH1 (the vacuole-targeted a-subunit isoform orthologous to human ATP6V0A1) results in more severe vacuolar alkalinization than loss of all V-ATPase activity (vma mutants), and causes reduced activity of the plasma membrane proton pump Pma1p despite Pma1p remaining correctly localized at the plasma membrane. This demonstrates that Vph1-containing V-ATPases are the primary determinants of vacuolar pH homeostasis, and that loss of vacuolar acidification secondarily impairs cytosolic pH regulation and Pma1 activity through a mechanism distinct from Pma1 mislocalization.","method":"Ratiometric vacuolar pH measurements (fluorescent reporters), cytosolic pH measurements with pHluorin, cell fractionation, plasma membrane Pma1p localization by imaging","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple quantitative pH measurements with orthogonal reporters, genetic comparisons across multiple mutant backgrounds","pmids":["21669878"],"is_preprint":false},{"year":2011,"finding":"A common 3'-UTR polymorphism (T+3246C, rs938671) in ATP6V0A1 creates a binding motif for microRNA hsa-miR-637. The C (variant) allele decreases ATP6V0A1 expression via differential miRNA-mediated repression, as shown by luciferase reporter assays and in vitro transcription/translation. Reduced ATP6V0A1 expression impairs chromaffin granule acidification (monitored by CHGA/EGFP fluorescence during bafilomycin A1 treatment), thereby altering chromogranin A (CHGA) processing to catestatin and reducing exocytotic secretion from the regulated pathway.","method":"Luciferase reporter assays with ATP6V0A1 3'-UTR, in vitro transcription/translation, intragranular pH monitoring by CHGA/EGFP chimera fluorescence, bafilomycin A1 treatment, immunoblot/MALDI-MS of CHGA processing fragments, miRNA precursor/antagomir cotransfection","journal":"Circulation. Cardiovascular genetics","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (reporter assay, in vitro translation, live-cell pH monitoring, peptide mass spectrometry) in a single rigorous study","pmids":["21558123"],"is_preprint":false},{"year":2014,"finding":"βA3/A1-crystallin (encoded by Cryba1) directly interacts with V-ATPase, the proton pump responsible for acidification of the endolysosomal system, in retinal astrocytes and retinal pigment epithelial (RPE) cells. Loss of βA3/A1-crystallin impairs lysosomal acidification, leading to defective phagocytosis and autophagy and accumulation of undigested cargo in autophagolysosomes, resembling pathological changes in age-related macular degeneration. This establishes a regulatory interaction between βA3/A1-crystallin and V-ATPase (which contains the ATP6V0A1 a1-subunit as its predominant neuronal isoform) in maintaining endolysosomal pH.","method":"Spontaneous rat mutant and genetically engineered mouse models, lysosomal pH measurements, phagocytosis/autophagy assays, co-immunoprecipitation/interaction studies with V-ATPase","journal":"Progress in retinal and eye research","confidence":"Medium","confidence_rationale":"Tier 2–3 — interaction demonstrated in vivo with functional consequence; V-ATPase a-subunit isoform identity not precisely specified as a1 but context (neurons/glia) consistent with ATP6V0A1","pmids":["25461968"],"is_preprint":false},{"year":2019,"finding":"The signaling lipid PI(3,5)P2 directly activates V-ATPase activity and proton pumping in yeast vacuolar vesicles containing the Vph1 isoform (ortholog of human ATP6V0A1), but not Stv1-containing vesicles. Addition of exogenous short-chain PI(3,5)P2 to isolated Vph1-containing vacuolar vesicles increases V-ATPase activity. Structural modeling and mutagenesis identified a membrane-oriented basic sequence (231KTREYKHK) in the cytosolic N-terminal domain of Vph1 as the PI(3,5)P2 interaction site; substitutions in this region abolish PI(3,5)P2-dependent activation without affecting basal V-ATPase activity. Loss of PI(3,5)P2 activation leads to enlarged vacuoles and a synthetic growth defect with deletion of the osmotic stress kinase Hog1.","method":"Biochemical characterization of isolated yeast vacuolar vesicles, exogenous short-chain PI(3,5)P2 addition, V-ATPase activity and proton pumping assays, computational domain modeling, site-directed mutagenesis of basic residues, genetic epistasis with hog1Δ","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted biochemical activation with isolated vesicles, mutagenesis of interaction site, genetic validation; multiple orthogonal approaches in single study","pmids":["31023825"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM and biochemical studies of V-ATPases reveal that the 'a' subunit (of which ATP6V0A1 is the neuronal isoform) forms the central component of the V0 membrane domain and contains the proton translocation half-channels. Regulated and reversible disassembly of V1 from V0 modulates enzymatic activity, and different 'a' subunit isoforms (a1–a4) are differentially localized to distinct organelles, though the biochemical properties of individual mammalian isoforms remain to be fully characterized.","method":"Cryo-EM structural analysis, biochemical activity measurements, reviewed from multiple studies","journal":"Trends in biochemical sciences","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures with functional validation synthesized from multiple independent laboratories; foundational mechanistic framework","pmids":["32001091"],"is_preprint":false},{"year":2021,"finding":"De novo missense variants in ATP6V0A1 (R741Q and A512P/N534D in biallelic form) cause developmental and epileptic encephalopathy in humans. Cell lines expressing these missense mutants show significantly impaired lysosomal acidification. Homozygous Atp6v0a1R741Q mice show embryonic lethality, while Atp6v0a1A512P/A512P mice show early postnatal mortality with brain pathology including: lysosomal dysfunction with cell death, accumulation of autophagosomes and lysosomes, reduced mTORC1 signaling, reduced synaptic connectivity, and lowered neurotransmitter contents of synaptic vesicles. This establishes ATP6V0A1 as essential for neuronal integrity, synaptic vesicle neurotransmitter loading, autophagy flux, and mTORC1 signaling in the brain.","method":"Patient variant identification, cell line expression of mutants with lysosomal pH assays, homozygous knock-in mouse models, embryonic lethality/postnatal survival analysis, neuropathology, autophagosome/lysosome quantification, mTORC1 signaling assays, synaptic connectivity and neurotransmitter content measurements","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (cell-based pH assays, two distinct knock-in mouse models, neuropathology, signaling assays), human genetic validation, replicated across multiple variants","pmids":["33833240"],"is_preprint":false},{"year":2021,"finding":"The R740Q variant in ATP6V0A1 (equivalent to R741Q in the mouse study) directly impairs endolysosomal acidification, leading to failure of lysosomal hydrolysis, autophagic dysfunction, and severe developmental defects in C. elegans. Biallelic ATP6V0A1 variants cause progressive myoclonus epilepsy with ataxia, while de novo missense variants cause severe developmental and epileptic encephalopathy, expanding the neurological phenotype spectrum. The R740Q mutation accounts for ~50% of identified mutations.","method":"Patient cohort genetic analysis, C. elegans modeling of R740Q with endolysosomal acidification assays, lysosomal hydrolysis assays, autophagy dysfunction assessment","journal":"Brain communications","confidence":"High","confidence_rationale":"Tier 2 — functional validation in C. elegans model with direct pH measurements, complementing and replicating findings from mouse models in independent study","pmids":["34909687"],"is_preprint":false},{"year":2024,"finding":"Tumor cell-intrinsic ATP6V0A1 drives exogenous cholesterol-induced immunosuppression in colorectal cancer (CRC). ATP6V0A1 facilitates cholesterol absorption in CRC cells through RABGEF1-dependent endosome maturation, causing cholesterol accumulation in the endoplasmic reticulum and elevated production of 24-hydroxycholesterol (24-OHC). ATP6V0A1-induced 24-OHC activates liver X receptor (LXR) signaling to upregulate TGF-β1. Released TGF-β1 activates the SMAD3 pathway in memory CD8+ T cells, suppressing their anti-tumor activity. The anti-HCV drug daclatasvir was identified as an ATP6V0A1 inhibitor that enhances memory CD8+ T cell activity and suppresses CRC tumor growth.","method":"Tumor cell line experiments, cholesterol uptake assays, endosome maturation assays, 24-OHC quantification, LXR signaling reporters, TGF-β1 ELISA, SMAD3 pathway assays in CD8+ T cells, in vivo tumor mouse models, drug (daclatasvir) inhibition assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal cellular and in vivo assays establishing a mechanistic pathway from ATP6V0A1 to cholesterol absorption to immune suppression; supported by pharmacological inhibition with defined outcome","pmids":["38971819"],"is_preprint":false}],"current_model":"ATP6V0A1 encodes the neuronally enriched a1-subunit of the V0 membrane domain of vacuolar H+-ATPases (V-ATPases), where it is essential for proton translocation, V1 domain assembly onto V0, and organelle-specific targeting; it maintains endolysosomal acidification required for lysosomal hydrolysis, autophagy flux, mTORC1 signaling, synaptic vesicle neurotransmitter loading, and synaptic connectivity in neurons, and additionally facilitates endosome maturation-dependent cholesterol absorption in cancer cells to drive LXR/TGF-β1-mediated immunosuppression, with its activity directly regulated by PI(3,5)P2 binding to a basic sequence in its cytosolic N-terminal domain."},"narrative":{"teleology":[{"year":1992,"claim":"Identification of Vph1p (the yeast ortholog of ATP6V0A1) as an essential V0 subunit resolved how the V-ATPase membrane domain is assembled and how it couples to the peripheral V1 catalytic domain for proton pumping.","evidence":"Genetic deletion/complementation and vacuolar ATPase/proton-pumping assays in S. cerevisiae","pmids":["1385813"],"confidence":"High","gaps":["Mammalian isoform-specific functions not yet addressed","Structural basis of V1–V0 coupling through the a subunit unknown","Regulation of V-ATPase assembly/disassembly not characterized"]},{"year":2002,"claim":"Recognition that different a-subunit isoforms (a1–a4) confer organelle-specific targeting of V-ATPase complexes established the principle that ATP6V0A1 directs the pump to neuronal and endolysosomal compartments, explaining compartment-specific acidification.","evidence":"Synthesis of biochemical, genetic, and immunolocalization studies across multiple systems","pmids":["11836511","9442887"],"confidence":"High","gaps":["Targeting signals within the a1 isoform not mapped","Relative contribution of a1 versus other isoforms in overlapping compartments unresolved"]},{"year":2011,"claim":"Quantitative pH measurements showed that Vph1-containing V-ATPases are the primary determinants of vacuolar pH homeostasis, with their loss causing more severe alkalinization than complete V-ATPase deletion and secondary impairment of cytosolic pH regulation.","evidence":"Ratiometric vacuolar and cytosolic pH reporters (pHluorin) in yeast vph1Δ and vma mutants","pmids":["21669878"],"confidence":"High","gaps":["Mechanism linking vacuolar alkalinization to Pma1p inhibition not identified","Relevance to mammalian ATP6V0A1-containing V-ATPases not tested"]},{"year":2011,"claim":"A human 3′-UTR polymorphism in ATP6V0A1 that modulates miR-637-mediated repression demonstrated that graded reduction in a1 expression is sufficient to impair secretory granule acidification and chromogranin A processing, linking V-ATPase dosage to neuroendocrine exocytosis.","evidence":"Luciferase reporters, intragranular pH monitoring via CHGA/EGFP, MALDI-MS of CHGA processing in chromaffin cells","pmids":["21558123"],"confidence":"High","gaps":["In vivo cardiovascular or endocrine phenotype of the variant not established","Whether other miRNAs regulate ATP6V0A1 in neurons unknown"]},{"year":2019,"claim":"Identification of PI(3,5)P₂ as a direct activator of Vph1-containing V-ATPases, binding a specific basic motif (231KTREYKHK) in the cytosolic N-terminal domain, revealed the first lipid-based regulatory mechanism for isoform-selective V-ATPase activation.","evidence":"Exogenous short-chain PI(3,5)P₂ addition to isolated yeast vacuolar vesicles, site-directed mutagenesis, genetic epistasis with hog1Δ","pmids":["31023825"],"confidence":"High","gaps":["Conservation of PI(3,5)P₂ activation for mammalian ATP6V0A1 not demonstrated","Structural basis of PI(3,5)P₂ binding at atomic resolution not available","Whether other phosphoinositides regulate a1 activity unknown"]},{"year":2020,"claim":"Cryo-EM structures confirmed that the a subunit forms the proton half-channels within V0 and mediates regulated V1–V0 disassembly, providing the structural framework for understanding how ATP6V0A1 mutations impair function.","evidence":"Cryo-EM structural determination with biochemical activity measurements synthesized across laboratories","pmids":["32001091"],"confidence":"High","gaps":["Isoform-resolved cryo-EM structure of mammalian a1-containing V-ATPase not yet obtained","Structural mechanism of PI(3,5)P₂-mediated activation not resolved"]},{"year":2021,"claim":"Human genetic and animal model studies established that ATP6V0A1 mutations cause developmental and epileptic encephalopathy and progressive myoclonus epilepsy by impairing lysosomal acidification, autophagy, mTORC1 signaling, and synaptic vesicle loading, defining ATP6V0A1 as a Mendelian disease gene for neuronal disorders.","evidence":"Patient variant identification, knock-in mouse models (R741Q, A512P), C. elegans R740Q modeling, lysosomal pH assays, neuropathology, synaptic connectivity and neurotransmitter quantification","pmids":["33833240","34909687"],"confidence":"High","gaps":["Genotype–phenotype correlation for individual variants incomplete","Whether mTORC1 signaling deficit is primary or secondary to lysosomal dysfunction unresolved","Therapeutic rescue strategies not demonstrated"]},{"year":2024,"claim":"Discovery that ATP6V0A1 drives cholesterol-mediated immunosuppression in colorectal cancer through RABGEF1-dependent endosome maturation, 24-OHC/LXR signaling, and TGF-β1 release expanded the gene's role beyond housekeeping acidification to tumor immune evasion.","evidence":"CRC cell lines, cholesterol uptake and endosome maturation assays, 24-OHC quantification, LXR reporters, CD8⁺ T cell SMAD3 signaling, in vivo tumor models, daclatasvir inhibition","pmids":["38971819"],"confidence":"High","gaps":["Whether ATP6V0A1-dependent cholesterol absorption operates in non-CRC cancers unknown","Selectivity and mechanism of daclatasvir as an ATP6V0A1 inhibitor not structurally resolved","Contribution of other a-subunit isoforms to this pathway not tested"]},{"year":null,"claim":"The isoform-resolved structure of mammalian ATP6V0A1-containing V-ATPase, the conservation of PI(3,5)P₂ activation in human cells, and the precise mechanism by which individual disease-causing missense mutations disrupt proton translocation remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No mammalian isoform-specific cryo-EM structure","PI(3,5)P₂ activation not validated for human ATP6V0A1","Genotype-to-structural-defect mapping for patient variants lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,8,9]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[8]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,9]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[3,10,11]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[12]},{"term_id":"GO:0005773","term_label":"vacuole","supporting_discovery_ids":[0,5,8]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[6,10]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,1,5,8,9]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[10,11]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[6,10]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[3,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[10,11,12]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,12]}],"complexes":["V-ATPase (V0 domain)"],"partners":["RABGEF1","CRYBA1","ATP6V1A","ATP6V1B2"],"other_free_text":[]},"mechanistic_narrative":"ATP6V0A1 encodes the a1 isoform of the V0 membrane domain of vacuolar H+-ATPases, serving as the central proton-translocation subunit that is essential for V-ATPase assembly, organelle-specific targeting, and compartment acidification in neurons and other cell types [PMID:1385813, PMID:9442887, PMID:32001091]. It maintains endolysosomal pH required for lysosomal hydrolysis, autophagy flux, mTORC1 signaling, and synaptic vesicle neurotransmitter loading; its activity is directly stimulated by PI(3,5)P₂ binding to a basic sequence in its cytosolic N-terminal domain [PMID:31023825, PMID:33833240]. De novo and biallelic missense variants in ATP6V0A1 cause developmental and epileptic encephalopathy and progressive myoclonus epilepsy with ataxia through impaired lysosomal acidification and neuronal dysfunction [PMID:33833240, PMID:34909687]. In colorectal cancer, ATP6V0A1 facilitates RABGEF1-dependent endosome maturation for cholesterol absorption, driving LXR/TGF-β1-mediated suppression of memory CD8⁺ T cells [PMID:38971819]."},"prefetch_data":{"uniprot":{"accession":"Q93050","full_name":"V-type proton ATPase 116 kDa subunit a 1","aliases":["Clathrin-coated vesicle/synaptic vesicle proton pump 116 kDa subunit","Vacuolar adenosine triphosphatase subunit Ac116","Vacuolar proton pump subunit 1","Vacuolar proton translocating ATPase 116 kDa subunit a isoform 1"],"length_aa":837,"mass_kda":96.4,"function":"Subunit of the V0 complex of vacuolar(H+)-ATPase (V-ATPase), a multisubunit enzyme composed of a peripheral complex (V1) that hydrolyzes ATP and a membrane integral complex (V0) that transports protons across cellular membranes. V-ATPase is responsible for the acidification of various organelles, such as lysosomes, endosomes, the trans-Golgi network, and secretory granules, including synaptic vesicles (PubMed:33065002, PubMed:33833240, PubMed:34909687). In certain cell types, can be exported to the plasma membrane, where it is involved in the acidification of the extracellular environment (By similarity). Required for assembly and activity of the vacuolar ATPase (By similarity). Through its action on compartment acidification, plays an essential role in neuronal development in terms of integrity and connectivity of neurons (PubMed:33833240)","subcellular_location":"Cytoplasmic vesicle, clathrin-coated vesicle membrane; Cytoplasmic vesicle, secretory vesicle, synaptic vesicle membrane; Melanosome","url":"https://www.uniprot.org/uniprotkb/Q93050/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ATP6V0A1","classification":"Not Classified","n_dependent_lines":61,"n_total_lines":1208,"dependency_fraction":0.050496688741721855},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000033627","cell_line_id":"CID001641","localizations":[{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"ATP6AP1","stoichiometry":10.0},{"gene":"ATP6AP2","stoichiometry":10.0},{"gene":"ATP6V0D1","stoichiometry":10.0},{"gene":"ATP6V1B2","stoichiometry":10.0},{"gene":"ATP6V1G1","stoichiometry":10.0},{"gene":"ATP6V1A","stoichiometry":4.0},{"gene":"ARL8B","stoichiometry":0.2},{"gene":"VAMP3;VAMP2","stoichiometry":0.2},{"gene":"ATP6V1H","stoichiometry":0.2},{"gene":"ATP6V1D","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001641","total_profiled":1310},"omim":[{"mim_id":"620760","title":"MITOCHONDRIAL LACTATE DEHYDROGENASE REGULATOR; MLDHR","url":"https://www.omim.org/entry/620760"},{"mim_id":"619971","title":"NEURODEVELOPMENTAL DISORDER WITH EPILEPSY AND BRAIN ATROPHY; NEDEBA","url":"https://www.omim.org/entry/619971"},{"mim_id":"619970","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 104; DEE104","url":"https://www.omim.org/entry/619970"},{"mim_id":"617627","title":"SMALL REGULATORY POLYPEPTIDE OF AMINO ACID RESPONSE; SPAAR","url":"https://www.omim.org/entry/617627"},{"mim_id":"613413","title":"TRANSMEMBRANE PROTEIN 106B; TMEM106B","url":"https://www.omim.org/entry/613413"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"},{"location":"Nuclear speckles","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":98.9}],"url":"https://www.proteinatlas.org/search/ATP6V0A1"},"hgnc":{"alias_symbol":["a1","Vph1","Stv1"],"prev_symbol":["VPP1","ATP6N1","ATP6N1A"]},"alphafold":{"accession":"Q93050","domains":[{"cath_id":"-","chopping":"371-473_499-661_714-814","consensus_level":"medium","plddt":89.4722,"start":371,"end":814}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q93050","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q93050-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q93050-F1-predicted_aligned_error_v6.png","plddt_mean":84.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ATP6V0A1","jax_strain_url":"https://www.jax.org/strain/search?query=ATP6V0A1"},"sequence":{"accession":"Q93050","fasta_url":"https://rest.uniprot.org/uniprotkb/Q93050.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q93050/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q93050"}},"corpus_meta":[{"pmid":"29437957","id":"PMC_29437957","title":"Normal 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VPH1 results in loss of vacuolar H+-ATPase assembly, dissociation of peripheral nucleotide-binding subunits from vacuolar membranes, and complete loss of ATP-dependent proton pumping and bafilomycin-sensitive ATPase activity.\",\n      \"method\": \"Genetic complementation, deletion disruption, vacuolar purification, ATPase activity assay, immunodetection, cell fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (genetic KO, biochemical fractionation, enzyme activity assay), foundational paper\",\n      \"pmids\": [\"1385813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Loss of Vph1 (yeast ortholog of ATP6V0A1) in yeast causes pronounced vacuolar alkalinization more severe than complete V-ATPase loss mutants; cytosolic pH responses to glucose are impaired; plasma membrane proton pump Pma1p remains at the plasma membrane but has reduced activity; early prevacuolar compartment pH parallels cytosolic pH changes even in the absence of V-ATPase function.\",\n      \"method\": \"Ratiometric pH measurements, cell fractionation, fluorescence microscopy, genetic deletion\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple quantitative biochemical methods with genetic controls\",\n      \"pmids\": [\"21669878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The cytosolic N-terminal domain of Vph1 (yeast ortholog of ATP6V0A1) directly interacts with the late endo-lysosomal lipid PI(3,5)P2; exogenous short-chain PI(3,5)P2 activates V-ATPase activity and proton pumping in Vph1-containing vacuolar vesicles; a clustered basic amino acid sequence (231KTREYKHK) in the N-terminal domain is required for PI(3,5)P2-dependent activation; loss of this interaction causes enlarged vacuoles and synthetic growth defects under osmotic stress.\",\n      \"method\": \"Biochemical characterization of isolated vacuolar vesicles, site-directed mutagenesis, in vitro proton pumping assay, structural modeling, genetic epistasis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis and functional assay\",\n      \"pmids\": [\"31023825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ATP6V0A1 (a1-subunit of the V0 domain of V-ATPases) is essential for lysosomal acidification in neurons; missense variants R741Q, A512P, and N534D significantly impair lysosomal acidification in cell lines; homozygous mouse models show lysosomal dysfunction with accumulated autophagosomes and lysosomes, reduced mTORC1 signaling, reduced synaptic connectivity, and lowered neurotransmitter contents of synaptic vesicles; R741Q causes embryonic lethality, indicating greater functional severity.\",\n      \"method\": \"Human genetics (de novo and biallelic variants), cell line lysosomal acidification assay, homozygous knock-in mouse models, autophagosome/lysosome accumulation analysis, mTORC1 signaling assay, synaptic vesicle analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (human variants, cell assays, mouse models), replicated across alleles\",\n      \"pmids\": [\"33833240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The R740Q variant in ATP6V0A1 directly impairs acidification of the endolysosomal compartment, causing autophagic dysfunction; this was demonstrated in Caenorhabditis elegans expressing the equivalent mutation, producing severe developmental defects; biallelic variants cause progressive myoclonus epilepsy while de novo missense variants cause developmental and epileptic encephalopathy.\",\n      \"method\": \"C. elegans genetic model, lysosomal acidification assay, autophagic flux assay\",\n      \"journal\": \"Brain communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in model organism and human genetics, replicating findings from PMID 33833240\",\n      \"pmids\": [\"34909687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A common 3'-UTR polymorphism T+3246C (rs938671) in ATP6V0A1 creates a binding motif for micro-RNA hsa-miR-637; the C (variant) allele decreases ATP6V0A1 gene expression; reduced ATP6V0A1 expression impairs chromaffin granule acidification (monitored by CHGA/EGFP fluorescence during bafilomycin A1 treatment), alters chromogranin A processing (reduced ratio of CHGA precursor to catestatin fragments), and decreases exocytotic secretion from the regulated pathway.\",\n      \"method\": \"Luciferase reporter assay, in vitro transcription/translation, fluorescence granule pH monitoring, miRNA cotransfection, immunoblot, MALDI mass spectrometry\",\n      \"journal\": \"Circulation. Cardiovascular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal biochemical methods linking polymorphism to V-ATPase function and downstream chromogranin processing\",\n      \"pmids\": [\"21558123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The a1 isoform (ATP6V0A1) of the V-ATPase 'a' subunit localizes to both the apical and basolateral membranes of intercalated cells in the mouse kidney collecting system and is expressed in all subtypes of intercalated cells (both AE1- and pendrin-positive); it is also expressed in the proximal tubule; this distinct localization pattern differs from a2 and a3 isoforms, suggesting isoform-specific functional roles.\",\n      \"method\": \"Real-time PCR, immunolocalization in mouse kidney sections\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct localization by immunohistochemistry without functional manipulation, single study\",\n      \"pmids\": [\"17595521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ATP6V0A1 facilitates cholesterol absorption in colorectal cancer cells through RABGEF1-dependent endosome maturation, leading to cholesterol accumulation in the endoplasmic reticulum and elevated production of 24-hydroxycholesterol (24-OHC); 24-OHC activates liver X receptor (LXR) signaling to upregulate TGF-β1, which is released into the tumor microenvironment to activate the SMAD3 pathway in memory CD8+ T cells and suppress their anti-tumor activity.\",\n      \"method\": \"Loss-of-function (knockdown/inhibition), cholesterol absorption assay, endosome maturation analysis, LXR signaling assay, TGF-β1 measurement, SMAD3 pathway analysis, T cell activity assay, drug inhibition with daclatasvir\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods linking ATP6V0A1 to endosome maturation, lipid metabolism, and immune signaling\",\n      \"pmids\": [\"38971819\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATP6V0A1 encodes the a1-subunit of the V0 domain of the vacuolar H+-ATPase (V-ATPase), where it is essential for V-ATPase assembly, lysosomal/endosomal acidification, and proton pumping; in neurons it supports mTORC1 signaling, autophagosome clearance, synaptic vesicle neurotransmitter loading, and synaptic connectivity, with pathogenic missense variants impairing lysosomal acidification and causing developmental and epileptic encephalopathy; additionally, its cytosolic N-terminal domain is directly activated by PI(3,5)P2 binding, and in colorectal cancer cells it drives RABGEF1-dependent endosome maturation to promote cholesterol absorption and downstream immunosuppressive TGF-β1 signaling.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\nPapers clearly about ATP6V0A1 (the a1-subunit of V-ATPase):\n- KEEP: [40] ATP6V0A1 brain development paper (PMID:33833240)\n- KEEP: [96] ATP6V0A1 progressive myoclonus epilepsy (PMID:34909687)\n- KEEP: [91] ATP6V0A1 3'-UTR polymorphism and chromogranin A (PMID:21558123)\n- KEEP: [79] ATP6V0A1 cholesterol absorption in CRC (PMID:38971819)\n- KEEP: [99] Differential localization of V-ATPase a1-a4 subunit isoforms in nephron (PMID:17595521)\n- KEEP: [8] VPH1 gene (yeast ortholog of ATP6V0A1) (PMID:1385813)\n- KEEP: [48] Consequences of loss of Vph1p-containing V-ATPases (PMID:21669878)\n- KEEP: [57] PI(3,5)P2 interaction with Vph1 isoform (PMID:31023825)\n- KEEP: [26] Cryptococcus VPH1 virulence (PMID:11737651) — fungal ortholog, cellular context consistent\n- KEEP: [6] V-ATPase review (PMID:11836511) — foundational review\n- KEEP: [14_curated] Structure/function V-ATPase review (PMID:9442887)\n- KEEP: [22_curated] Structure/properties V-ATPases (PMID:10224039)\n- KEEP: [19_curated] V-ATPase physiological reviews (PMID:10221984)\n- KEEP: [26_curated] V-ATPase biochemical journal review (PMID:9210392)\n- KEEP: [30_curated] Structure and Roles of V-type ATPases (PMID:32001091)\n- KEEP: [61] βA3/A1-crystallin interaction with V-ATPase (PMID:25461968) — describes interaction with the V-ATPase a-subunit\n\nPapers about other \"A1\" genes (alias collisions):\n- EXCLUDE: [1] A1-like astrocytes (different context)\n- EXCLUDE: [2] hnRNP A1 (different gene)\n- EXCLUDE: [3] hnRNP A1 (different gene)\n- EXCLUDE: [4] Bafilomycin A1 (drug, not gene)\n- EXCLUDE: [5] hnRNP A1 telomere\n- EXCLUDE: [6] Annexin A1\n- EXCLUDE: [7] Adenosine A1 receptor\n- EXCLUDE: [9] Adenosine A1 receptor (RDC7)\n- EXCLUDE: [10] Adenosine A1/A2 receptors\n- EXCLUDE: [11] Serum amyloid A1\n- EXCLUDE: [12] Annexin A1\n- EXCLUDE: [13] Bcl-2 A1 (apoptosis regulator)\n- EXCLUDE: [14] Arabidopsis STV1 (plant ribosomal protein)\n- EXCLUDE: [15] hnRNP A1 telomerase\n- EXCLUDE: [16] Bcl-2 homologue A1\n- EXCLUDE: [17] Ephrin-A1\n- EXCLUDE: [18] Annexin A1\n- EXCLUDE: [19] Phospholipases A1\n- EXCLUDE: [20] Adenosine A1 receptor\n- EXCLUDE: [21] hnRNP A1 splicing\n- EXCLUDE: [22] MAGE-A1\n- EXCLUDE: [23] Annexin A1\n- EXCLUDE: [24] Adenosine A1/A2 receptors\n- EXCLUDE: [25] UVA1 phototherapy\n- EXCLUDE: [27] Adenosine A2A/A1 receptors\n- EXCLUDE: [28] Adenosine A1/A2b receptors\n- EXCLUDE: [29] Apolipoprotein A1\n- EXCLUDE: [30] Adenosine A1/A3 receptors\n- EXCLUDE: [31] Ephrin-A1\n- EXCLUDE: [32] Adenosine A1 receptor\n- EXCLUDE: [33] Adenosine A1/A2a receptors\n- EXCLUDE: [34] Adenosine A1/A2 receptors\n- EXCLUDE: [35] Annexin A1\n- EXCLUDE: [36] Adenosine A1 receptor\n- EXCLUDE: [37] Ephrin-A1/ADAM12\n- EXCLUDE: [38] TRP-A1 (TRPA1 channel)\n- EXCLUDE: [39] Annexin A1\n- EXCLUDE: [41] Annexin A1\n- EXCLUDE: [42] Adenosine A1/A2 receptors\n- EXCLUDE: [43] Cyclin A1-CDK2\n- EXCLUDE: [44] Annexin A1\n- EXCLUDE: [45] Serum amyloid A1\n- EXCLUDE: [46] Annexin A1\n- EXCLUDE: [47] Napyradiomycins A1/B1 (natural products)\n- EXCLUDE: [49] Adenosine A1 receptor\n- EXCLUDE: [50] Annexin A1\n- EXCLUDE: [51] MAGE-A1/BORIS\n- EXCLUDE: [52] Annexin A1\n- EXCLUDE: [53] A1 protein (myelin basic protein peptide)\n- EXCLUDE: [54] Apolipoprotein A1\n- EXCLUDE: [55] Ephrin-A1\n- EXCLUDE: [56] Annexin A1\n- EXCLUDE: [58] Adenosine A1/A2 receptors\n- EXCLUDE: [59] Annexin A1\n- EXCLUDE: [60] Annexin A1\n- EXCLUDE: [62] Adenosine A1 receptor\n- EXCLUDE: [63] Adenosine A1 receptor pharmacochaperoning\n- EXCLUDE: [64] Coumermycin A1 (antibiotic)\n- EXCLUDE: [65] Adenosine A1 receptor allosteric enhancers\n- EXCLUDE: [66] Prostaglandin A1 hydroxylation\n- EXCLUDE: [67] Adenosine A1/A2B receptors\n- EXCLUDE: [68] Annexin A1 immunosurveillance\n- EXCLUDE: [69] Vernalization-A1 (wheat gene)\n- EXCLUDE: [70] hnRNP A1 LANA\n- EXCLUDE: [71] hnRNP A1 telomeres\n- EXCLUDE: [72] Adenosine A1 receptor ligands\n- EXCLUDE: [73] Scavenger receptor A1\n- EXCLUDE: [74] hnRNP A1 VRK1 phosphorylation\n- EXCLUDE: [75] Annexin A1 adiposity\n- EXCLUDE: [76] TaSAP1-A1 (wheat gene)\n- EXCLUDE: [77] Annexin A1 glucocorticoid\n- EXCLUDE: [78] Annexin A1 tumors\n- EXCLUDE: [80] Homeobox A1 / miR-99a-5p\n- EXCLUDE: [81] Adenosine A1/A2a receptors\n- EXCLUDE: [82] Adenosine A1 receptor ligands\n- EXCLUDE: [83] Arabidopsis STV1 (plant)\n- EXCLUDE: [84] hnRNP A1\n- EXCLUDE: [85] Arabidopsis/maize Vpp1 (plant V-PPase, different enzyme)\n- EXCLUDE: [86] Adenosine A1 receptor seizures\n- EXCLUDE: [87] Annexin A1 vascular aging\n- EXCLUDE: [88] Serum amyloid A1 glioblastoma\n- EXCLUDE: [89] Botulinum neurotoxin A1/A2\n- EXCLUDE: [90] Adenosine A1/H1 receptors\n- EXCLUDE: [92] Phage VPp1 (unrelated)\n- EXCLUDE: [93] hnRNP A1/A2 HPV splicing\n- EXCLUDE: [94] TRP-A1 gastric nociception\n- EXCLUDE: [95] CORM-A1 (carbon monoxide releasing molecule)\n- EXCLUDE: [97] Procarboxypeptidase A1 (digestive enzyme)\n- EXCLUDE: [98] Adenosine A1 receptor heart failure\n\nCurated papers:\n- KEEP: [1_curated] MGC cDNA (PMID:12477932) — sequence resource, no mechanism\n- KEEP: [2_curated] HIV dependency factors screen (PMID:18187620) — ATP6V0A1 identified but no mechanism\n- KEEP: [3_curated] BioPlex network (PMID:26186194) — interactome\n- KEEP: [4_curated] BioPlex 2.0 (PMID:28514442) — interactome\n- KEEP: [5_curated] Human interactome quantitative (PMID:26496610)\n- KEEP: [6_curated] V-ATPase nature review (PMID:11836511)\n- KEEP: [7_curated] HuRI interactome (PMID:32296183)\n- KEEP: [9_curated] BioPlex 3.0 (PMID:33961781)\n- KEEP: [10_curated] Census human protein complexes (PMID:22939629)\n- KEEP: [16_curated] Centrosome-cilium BioID (PMID:26638075)\n- KEEP: [17_curated] OpenCell (PMID:35271311)\n- KEEP: [18_curated] Metazoan complexes (PMID:26344197)\n- KEEP: [21_curated] Zika/Dengue dependency screen (PMID:27342126)\n- KEEP: [27_curated] LDHB lysosome autophagy (PMID:27622334) — mentions V-ATPase but not specifically a1\n- KEEP: [29_curated] Transferrin endocytosis (PMID:2874839) — general endocytosis, no specific ATP6V0A1\n\nNow extracting mechanistic discoveries only from KEPT papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1992,\n      \"finding\": \"The yeast VPH1 gene (ortholog of human ATP6V0A1) encodes a 95-kDa integral membrane polypeptide of the V0 domain that is essential for vacuolar H+-ATPase assembly and vacuolar acidification. Loss of VPH1 abolishes bafilomycin-sensitive ATPase activity and ATP-dependent proton pumping in vacuoles, and causes the peripheral nucleotide-binding subunits (60 and 69 kDa) of the V-ATPase to dissociate from vacuolar membranes, demonstrating that Vph1p is required for V1 domain attachment to the membrane V0 domain.\",\n      \"method\": \"Genetic deletion/complementation, vacuolar ATPase activity assays, proton pumping assays, cell fractionation, immunodetection, antibody library screening\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal biochemical assays (ATPase activity, proton pumping, fractionation) plus genetic complementation in yeast ortholog; foundational study replicated across field\",\n      \"pmids\": [\"1385813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The V-ATPase is a multisubunit complex composed of a peripheral V1 domain (responsible for ATP hydrolysis, subunits A–H) and an integral V0 domain (responsible for proton translocation, subunits a–d). The 'a' subunit (the ortholog of ATP6V0A1) resides in the V0 domain and is required for proton translocation. Assembly of V1 onto V0 is a regulated process, and the 'a' subunit isoforms determine organelle targeting.\",\n      \"method\": \"Biochemical reconstitution, genetic analysis, subunit mutagenesis studies reviewed\",\n      \"journal\": \"Annual review of cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — comprehensive review synthesizing reconstitution, genetics, and mutagenesis from multiple laboratories; foundational mechanistic framework\",\n      \"pmids\": [\"9442887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In Cryptococcus neoformans, disruption of VPH1 (ortholog of ATP6V0A1) results in defects in multiple virulence factors (capsule production, laccase activity, urease expression) and a growth defect at 37°C, phenocopied by the V-ATPase inhibitor bafilomycin A1. These defects are rescued by complementation with wild-type VPH1, establishing that Vph1p-dependent vesicular acidification is required for proper protein secretion, metal cofactor insertion (for laccase), and glycosylation processes in vivo.\",\n      \"method\": \"Insertional mutagenesis, plasmid rescue, complementation, bafilomycin A1 inhibition, virulence assays in mouse model\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with complementation rescue, multiple phenotypic readouts, pharmacological corroboration with bafilomycin\",\n      \"pmids\": [\"11737651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"V-ATPases are the primary drivers of intracellular compartment acidification in eukaryotes. The 'a' subunit isoforms of the V0 domain (including the a1 isoform encoded by ATP6V0A1) determine the specific organelle targeting of the V-ATPase complex, with different isoforms directing the pump to distinct intracellular compartments (e.g., lysosomes, Golgi, synaptic vesicles). This isoform-based targeting underlies compartment-specific acidification.\",\n      \"method\": \"Biochemical and genetic analysis reviewed; isoform-specific localization studies\",\n      \"journal\": \"Nature reviews. Molecular cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — synthesis of multiple independent biochemical and genetic studies establishing isoform-specific targeting; widely replicated\",\n      \"pmids\": [\"11836511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The a1 isoform (ATP6V0A1) of the V-ATPase V0 domain is expressed in the mouse kidney and localizes to both the apical and basolateral membranes of intercalated cells of the collecting system, as well as to the proximal tubule. In intercalated cells, a1 co-localizes with both AE1 (type A intercalated cells) and pendrin (type B intercalated cells), unlike the a2 isoform which is absent from pendrin-expressing cells. This differential localization suggests that V-ATPases containing different 'a' subunit isoforms serve distinct physiological roles along the nephron.\",\n      \"method\": \"Real-time PCR for expression quantification, immunolocalization with isoform-specific antibodies in mouse kidney sections\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct immunolocalization experiment with functional interpretation; single study but multiple isoforms compared systematically\",\n      \"pmids\": [\"17595521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In yeast, loss of VPH1 (the vacuole-targeted a-subunit isoform orthologous to human ATP6V0A1) results in more severe vacuolar alkalinization than loss of all V-ATPase activity (vma mutants), and causes reduced activity of the plasma membrane proton pump Pma1p despite Pma1p remaining correctly localized at the plasma membrane. This demonstrates that Vph1-containing V-ATPases are the primary determinants of vacuolar pH homeostasis, and that loss of vacuolar acidification secondarily impairs cytosolic pH regulation and Pma1 activity through a mechanism distinct from Pma1 mislocalization.\",\n      \"method\": \"Ratiometric vacuolar pH measurements (fluorescent reporters), cytosolic pH measurements with pHluorin, cell fractionation, plasma membrane Pma1p localization by imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple quantitative pH measurements with orthogonal reporters, genetic comparisons across multiple mutant backgrounds\",\n      \"pmids\": [\"21669878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A common 3'-UTR polymorphism (T+3246C, rs938671) in ATP6V0A1 creates a binding motif for microRNA hsa-miR-637. The C (variant) allele decreases ATP6V0A1 expression via differential miRNA-mediated repression, as shown by luciferase reporter assays and in vitro transcription/translation. Reduced ATP6V0A1 expression impairs chromaffin granule acidification (monitored by CHGA/EGFP fluorescence during bafilomycin A1 treatment), thereby altering chromogranin A (CHGA) processing to catestatin and reducing exocytotic secretion from the regulated pathway.\",\n      \"method\": \"Luciferase reporter assays with ATP6V0A1 3'-UTR, in vitro transcription/translation, intragranular pH monitoring by CHGA/EGFP chimera fluorescence, bafilomycin A1 treatment, immunoblot/MALDI-MS of CHGA processing fragments, miRNA precursor/antagomir cotransfection\",\n      \"journal\": \"Circulation. Cardiovascular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (reporter assay, in vitro translation, live-cell pH monitoring, peptide mass spectrometry) in a single rigorous study\",\n      \"pmids\": [\"21558123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"βA3/A1-crystallin (encoded by Cryba1) directly interacts with V-ATPase, the proton pump responsible for acidification of the endolysosomal system, in retinal astrocytes and retinal pigment epithelial (RPE) cells. Loss of βA3/A1-crystallin impairs lysosomal acidification, leading to defective phagocytosis and autophagy and accumulation of undigested cargo in autophagolysosomes, resembling pathological changes in age-related macular degeneration. This establishes a regulatory interaction between βA3/A1-crystallin and V-ATPase (which contains the ATP6V0A1 a1-subunit as its predominant neuronal isoform) in maintaining endolysosomal pH.\",\n      \"method\": \"Spontaneous rat mutant and genetically engineered mouse models, lysosomal pH measurements, phagocytosis/autophagy assays, co-immunoprecipitation/interaction studies with V-ATPase\",\n      \"journal\": \"Progress in retinal and eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — interaction demonstrated in vivo with functional consequence; V-ATPase a-subunit isoform identity not precisely specified as a1 but context (neurons/glia) consistent with ATP6V0A1\",\n      \"pmids\": [\"25461968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The signaling lipid PI(3,5)P2 directly activates V-ATPase activity and proton pumping in yeast vacuolar vesicles containing the Vph1 isoform (ortholog of human ATP6V0A1), but not Stv1-containing vesicles. Addition of exogenous short-chain PI(3,5)P2 to isolated Vph1-containing vacuolar vesicles increases V-ATPase activity. Structural modeling and mutagenesis identified a membrane-oriented basic sequence (231KTREYKHK) in the cytosolic N-terminal domain of Vph1 as the PI(3,5)P2 interaction site; substitutions in this region abolish PI(3,5)P2-dependent activation without affecting basal V-ATPase activity. Loss of PI(3,5)P2 activation leads to enlarged vacuoles and a synthetic growth defect with deletion of the osmotic stress kinase Hog1.\",\n      \"method\": \"Biochemical characterization of isolated yeast vacuolar vesicles, exogenous short-chain PI(3,5)P2 addition, V-ATPase activity and proton pumping assays, computational domain modeling, site-directed mutagenesis of basic residues, genetic epistasis with hog1Δ\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted biochemical activation with isolated vesicles, mutagenesis of interaction site, genetic validation; multiple orthogonal approaches in single study\",\n      \"pmids\": [\"31023825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM and biochemical studies of V-ATPases reveal that the 'a' subunit (of which ATP6V0A1 is the neuronal isoform) forms the central component of the V0 membrane domain and contains the proton translocation half-channels. Regulated and reversible disassembly of V1 from V0 modulates enzymatic activity, and different 'a' subunit isoforms (a1–a4) are differentially localized to distinct organelles, though the biochemical properties of individual mammalian isoforms remain to be fully characterized.\",\n      \"method\": \"Cryo-EM structural analysis, biochemical activity measurements, reviewed from multiple studies\",\n      \"journal\": \"Trends in biochemical sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures with functional validation synthesized from multiple independent laboratories; foundational mechanistic framework\",\n      \"pmids\": [\"32001091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"De novo missense variants in ATP6V0A1 (R741Q and A512P/N534D in biallelic form) cause developmental and epileptic encephalopathy in humans. Cell lines expressing these missense mutants show significantly impaired lysosomal acidification. Homozygous Atp6v0a1R741Q mice show embryonic lethality, while Atp6v0a1A512P/A512P mice show early postnatal mortality with brain pathology including: lysosomal dysfunction with cell death, accumulation of autophagosomes and lysosomes, reduced mTORC1 signaling, reduced synaptic connectivity, and lowered neurotransmitter contents of synaptic vesicles. This establishes ATP6V0A1 as essential for neuronal integrity, synaptic vesicle neurotransmitter loading, autophagy flux, and mTORC1 signaling in the brain.\",\n      \"method\": \"Patient variant identification, cell line expression of mutants with lysosomal pH assays, homozygous knock-in mouse models, embryonic lethality/postnatal survival analysis, neuropathology, autophagosome/lysosome quantification, mTORC1 signaling assays, synaptic connectivity and neurotransmitter content measurements\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (cell-based pH assays, two distinct knock-in mouse models, neuropathology, signaling assays), human genetic validation, replicated across multiple variants\",\n      \"pmids\": [\"33833240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The R740Q variant in ATP6V0A1 (equivalent to R741Q in the mouse study) directly impairs endolysosomal acidification, leading to failure of lysosomal hydrolysis, autophagic dysfunction, and severe developmental defects in C. elegans. Biallelic ATP6V0A1 variants cause progressive myoclonus epilepsy with ataxia, while de novo missense variants cause severe developmental and epileptic encephalopathy, expanding the neurological phenotype spectrum. The R740Q mutation accounts for ~50% of identified mutations.\",\n      \"method\": \"Patient cohort genetic analysis, C. elegans modeling of R740Q with endolysosomal acidification assays, lysosomal hydrolysis assays, autophagy dysfunction assessment\",\n      \"journal\": \"Brain communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional validation in C. elegans model with direct pH measurements, complementing and replicating findings from mouse models in independent study\",\n      \"pmids\": [\"34909687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Tumor cell-intrinsic ATP6V0A1 drives exogenous cholesterol-induced immunosuppression in colorectal cancer (CRC). ATP6V0A1 facilitates cholesterol absorption in CRC cells through RABGEF1-dependent endosome maturation, causing cholesterol accumulation in the endoplasmic reticulum and elevated production of 24-hydroxycholesterol (24-OHC). ATP6V0A1-induced 24-OHC activates liver X receptor (LXR) signaling to upregulate TGF-β1. Released TGF-β1 activates the SMAD3 pathway in memory CD8+ T cells, suppressing their anti-tumor activity. The anti-HCV drug daclatasvir was identified as an ATP6V0A1 inhibitor that enhances memory CD8+ T cell activity and suppresses CRC tumor growth.\",\n      \"method\": \"Tumor cell line experiments, cholesterol uptake assays, endosome maturation assays, 24-OHC quantification, LXR signaling reporters, TGF-β1 ELISA, SMAD3 pathway assays in CD8+ T cells, in vivo tumor mouse models, drug (daclatasvir) inhibition assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal cellular and in vivo assays establishing a mechanistic pathway from ATP6V0A1 to cholesterol absorption to immune suppression; supported by pharmacological inhibition with defined outcome\",\n      \"pmids\": [\"38971819\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATP6V0A1 encodes the neuronally enriched a1-subunit of the V0 membrane domain of vacuolar H+-ATPases (V-ATPases), where it is essential for proton translocation, V1 domain assembly onto V0, and organelle-specific targeting; it maintains endolysosomal acidification required for lysosomal hydrolysis, autophagy flux, mTORC1 signaling, synaptic vesicle neurotransmitter loading, and synaptic connectivity in neurons, and additionally facilitates endosome maturation-dependent cholesterol absorption in cancer cells to drive LXR/TGF-β1-mediated immunosuppression, with its activity directly regulated by PI(3,5)P2 binding to a basic sequence in its cytosolic N-terminal domain.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ATP6V0A1 encodes the a1 isoform of the V0 sector 'a' subunit of the vacuolar H⁺-ATPase (V-ATPase), where it is essential for proton pump assembly, organellar acidification, and diverse downstream cellular processes including autophagy, mTORC1 signaling, and neurotransmitter loading. Deletion of the yeast ortholog VPH1 abolishes V-ATPase assembly and ATP-dependent proton pumping [PMID:1385813], and the cytosolic N-terminal domain is directly activated by PI(3,5)P₂ binding through a conserved basic motif, coupling lipid signaling to proton transport [PMID:31023825]. In neurons, ATP6V0A1 is required for lysosomal acidification, autophagosome clearance, mTORC1 activation, and synaptic vesicle neurotransmitter content; pathogenic missense variants (e.g., R741Q, A512P) impair lysosomal acidification and cause developmental and epileptic encephalopathy in humans [PMID:33833240, PMID:34909687]. In colorectal cancer cells, ATP6V0A1 drives RABGEF1-dependent endosome maturation to promote cholesterol absorption, 24-hydroxycholesterol production, and LXR-dependent TGF-β1 secretion that suppresses anti-tumor CD8⁺ T cell activity [PMID:38971819].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"The foundational question of whether the 'a' subunit is required for V-ATPase function was resolved: VPH1 (yeast ATP6V0A1 ortholog) is essential for in vivo V-ATPase assembly, peripheral subunit attachment to membranes, and proton pumping.\",\n      \"evidence\": \"Genetic deletion, vacuolar purification, ATPase activity assay, and immunodetection in S. cerevisiae\",\n      \"pmids\": [\"1385813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which the a-subunit nucleates V0–V1 assembly was not defined\",\n        \"Whether mammalian a1 isoform has identical roles to yeast VPH1 was untested\",\n        \"No structural model of how the a-subunit interfaces with other V0 subunits\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Tissue-level expression mapping established that ATP6V0A1 has a distinct localization in kidney collecting duct intercalated cells and proximal tubules, differentiating it from other 'a' isoforms and implying isoform-specific physiological roles.\",\n      \"evidence\": \"Real-time PCR and immunohistochemistry on mouse kidney sections\",\n      \"pmids\": [\"17595521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional manipulation was performed to test whether a1 has non-redundant kidney roles\",\n        \"Subcellular trafficking determinants for apical versus basolateral targeting were not identified\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Two studies expanded understanding of ATP6V0A1's physiological impact: loss of Vph1 caused vacuolar alkalinization exceeding that of complete V-ATPase loss mutants and impaired cytosolic pH regulation, while a human 3′-UTR polymorphism reducing ATP6V0A1 expression impaired chromaffin granule acidification, chromogranin A processing, and regulated exocytotic secretion.\",\n      \"evidence\": \"Ratiometric pH measurements and genetic deletion in yeast (PMID:21669878); luciferase reporter, miRNA co-transfection, MALDI-MS, and granule pH monitoring in chromaffin cells (PMID:21558123)\",\n      \"pmids\": [\"21669878\", \"21558123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Why Vph1 loss causes more severe alkalinization than total V-ATPase absence is mechanistically unexplained\",\n        \"Whether the miR-637/ATP6V0A1 axis operates in vivo in human neuroendocrine tissues was not tested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The regulatory input to V-ATPase was defined: the cytosolic N-terminal domain of Vph1/ATP6V0A1 directly binds PI(3,5)P₂ through a basic motif (²³¹KTREYKHK), and this interaction is required for lipid-dependent stimulation of proton pumping, establishing a lipid-signaling mechanism controlling V-ATPase activity.\",\n      \"evidence\": \"In vitro reconstitution with isolated vacuolar vesicles, site-directed mutagenesis, proton pumping assay, and genetic epistasis in yeast\",\n      \"pmids\": [\"31023825\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether mammalian ATP6V0A1 retains PI(3,5)P₂-dependent regulation was not directly shown\",\n        \"Structural basis for how PI(3,5)P₂ binding allosterically activates proton translocation is unknown\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Direct disease relevance was established: ATP6V0A1 missense variants impair lysosomal acidification and cause developmental and epileptic encephalopathy in humans; knock-in mouse models showed accumulated autophagosomes, reduced mTORC1 signaling, decreased synaptic connectivity, and depleted synaptic vesicle neurotransmitter content, while C. elegans models confirmed autophagic dysfunction.\",\n      \"evidence\": \"Human genetics with de novo and biallelic variants, cell line acidification assays, homozygous knock-in mice, synaptic vesicle and mTORC1 analysis (PMID:33833240); C. elegans model with equivalent mutation and autophagic flux assay (PMID:34909687)\",\n      \"pmids\": [\"33833240\", \"34909687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How individual missense variants differentially affect V-ATPase assembly versus proton translocation is not resolved\",\n        \"Whether mTORC1 reduction is a direct or indirect consequence of impaired acidification is unclear\",\n        \"Genotype-phenotype correlations across the full allelic series are incomplete\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A non-canonical role in cancer immune evasion was uncovered: ATP6V0A1 promotes RABGEF1-dependent endosome maturation in colorectal cancer cells, enabling cholesterol absorption, 24-hydroxycholesterol synthesis, LXR-dependent TGF-β1 upregulation, and suppression of anti-tumor CD8⁺ T cell responses via SMAD3 activation.\",\n      \"evidence\": \"Knockdown/inhibition in colorectal cancer cells with cholesterol absorption, endosome maturation, LXR signaling, TGF-β1, and T cell functional assays\",\n      \"pmids\": [\"38971819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether this cholesterol–TGF-β1 axis operates in other tumor types is unknown\",\n        \"The mechanism by which ATP6V0A1 specifically engages RABGEF1 at the molecular level is not defined\",\n        \"In vivo validation of ATP6V0A1 as a therapeutic target for anti-tumor immunity is limited\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Open question: how the mammalian a1 isoform is differentially regulated compared to other 'a' isoforms (a2–a4) at the structural and signaling level, and whether PI(3,5)P₂-dependent activation is conserved in human neurons, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of mammalian ATP6V0A1 in complex with V0 ring is available\",\n        \"Isoform-specific regulatory mechanisms in distinct human cell types are untested\",\n        \"Therapeutic approaches targeting ATP6V0A1 for encephalopathy or cancer are unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005773\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 4, 7]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [\n      \"V-ATPase (V0 sector)\"\n    ],\n    \"partners\": [\n      \"RABGEF1\",\n      \"PI(3,5)P2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"ATP6V0A1 encodes the a1 isoform of the V0 membrane domain of vacuolar H+-ATPases, serving as the central proton-translocation subunit that is essential for V-ATPase assembly, organelle-specific targeting, and compartment acidification in neurons and other cell types [PMID:1385813, PMID:9442887, PMID:32001091]. It maintains endolysosomal pH required for lysosomal hydrolysis, autophagy flux, mTORC1 signaling, and synaptic vesicle neurotransmitter loading; its activity is directly stimulated by PI(3,5)P₂ binding to a basic sequence in its cytosolic N-terminal domain [PMID:31023825, PMID:33833240]. De novo and biallelic missense variants in ATP6V0A1 cause developmental and epileptic encephalopathy and progressive myoclonus epilepsy with ataxia through impaired lysosomal acidification and neuronal dysfunction [PMID:33833240, PMID:34909687]. In colorectal cancer, ATP6V0A1 facilitates RABGEF1-dependent endosome maturation for cholesterol absorption, driving LXR/TGF-β1-mediated suppression of memory CD8⁺ T cells [PMID:38971819].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Identification of Vph1p (the yeast ortholog of ATP6V0A1) as an essential V0 subunit resolved how the V-ATPase membrane domain is assembled and how it couples to the peripheral V1 catalytic domain for proton pumping.\",\n      \"evidence\": \"Genetic deletion/complementation and vacuolar ATPase/proton-pumping assays in S. cerevisiae\",\n      \"pmids\": [\"1385813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mammalian isoform-specific functions not yet addressed\",\n        \"Structural basis of V1–V0 coupling through the a subunit unknown\",\n        \"Regulation of V-ATPase assembly/disassembly not characterized\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Recognition that different a-subunit isoforms (a1–a4) confer organelle-specific targeting of V-ATPase complexes established the principle that ATP6V0A1 directs the pump to neuronal and endolysosomal compartments, explaining compartment-specific acidification.\",\n      \"evidence\": \"Synthesis of biochemical, genetic, and immunolocalization studies across multiple systems\",\n      \"pmids\": [\"11836511\", \"9442887\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Targeting signals within the a1 isoform not mapped\",\n        \"Relative contribution of a1 versus other isoforms in overlapping compartments unresolved\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Quantitative pH measurements showed that Vph1-containing V-ATPases are the primary determinants of vacuolar pH homeostasis, with their loss causing more severe alkalinization than complete V-ATPase deletion and secondary impairment of cytosolic pH regulation.\",\n      \"evidence\": \"Ratiometric vacuolar and cytosolic pH reporters (pHluorin) in yeast vph1Δ and vma mutants\",\n      \"pmids\": [\"21669878\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism linking vacuolar alkalinization to Pma1p inhibition not identified\",\n        \"Relevance to mammalian ATP6V0A1-containing V-ATPases not tested\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"A human 3′-UTR polymorphism in ATP6V0A1 that modulates miR-637-mediated repression demonstrated that graded reduction in a1 expression is sufficient to impair secretory granule acidification and chromogranin A processing, linking V-ATPase dosage to neuroendocrine exocytosis.\",\n      \"evidence\": \"Luciferase reporters, intragranular pH monitoring via CHGA/EGFP, MALDI-MS of CHGA processing in chromaffin cells\",\n      \"pmids\": [\"21558123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"In vivo cardiovascular or endocrine phenotype of the variant not established\",\n        \"Whether other miRNAs regulate ATP6V0A1 in neurons unknown\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of PI(3,5)P₂ as a direct activator of Vph1-containing V-ATPases, binding a specific basic motif (231KTREYKHK) in the cytosolic N-terminal domain, revealed the first lipid-based regulatory mechanism for isoform-selective V-ATPase activation.\",\n      \"evidence\": \"Exogenous short-chain PI(3,5)P₂ addition to isolated yeast vacuolar vesicles, site-directed mutagenesis, genetic epistasis with hog1Δ\",\n      \"pmids\": [\"31023825\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Conservation of PI(3,5)P₂ activation for mammalian ATP6V0A1 not demonstrated\",\n        \"Structural basis of PI(3,5)P₂ binding at atomic resolution not available\",\n        \"Whether other phosphoinositides regulate a1 activity unknown\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Cryo-EM structures confirmed that the a subunit forms the proton half-channels within V0 and mediates regulated V1–V0 disassembly, providing the structural framework for understanding how ATP6V0A1 mutations impair function.\",\n      \"evidence\": \"Cryo-EM structural determination with biochemical activity measurements synthesized across laboratories\",\n      \"pmids\": [\"32001091\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Isoform-resolved cryo-EM structure of mammalian a1-containing V-ATPase not yet obtained\",\n        \"Structural mechanism of PI(3,5)P₂-mediated activation not resolved\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Human genetic and animal model studies established that ATP6V0A1 mutations cause developmental and epileptic encephalopathy and progressive myoclonus epilepsy by impairing lysosomal acidification, autophagy, mTORC1 signaling, and synaptic vesicle loading, defining ATP6V0A1 as a Mendelian disease gene for neuronal disorders.\",\n      \"evidence\": \"Patient variant identification, knock-in mouse models (R741Q, A512P), C. elegans R740Q modeling, lysosomal pH assays, neuropathology, synaptic connectivity and neurotransmitter quantification\",\n      \"pmids\": [\"33833240\", \"34909687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Genotype–phenotype correlation for individual variants incomplete\",\n        \"Whether mTORC1 signaling deficit is primary or secondary to lysosomal dysfunction unresolved\",\n        \"Therapeutic rescue strategies not demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Discovery that ATP6V0A1 drives cholesterol-mediated immunosuppression in colorectal cancer through RABGEF1-dependent endosome maturation, 24-OHC/LXR signaling, and TGF-β1 release expanded the gene's role beyond housekeeping acidification to tumor immune evasion.\",\n      \"evidence\": \"CRC cell lines, cholesterol uptake and endosome maturation assays, 24-OHC quantification, LXR reporters, CD8⁺ T cell SMAD3 signaling, in vivo tumor models, daclatasvir inhibition\",\n      \"pmids\": [\"38971819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether ATP6V0A1-dependent cholesterol absorption operates in non-CRC cancers unknown\",\n        \"Selectivity and mechanism of daclatasvir as an ATP6V0A1 inhibitor not structurally resolved\",\n        \"Contribution of other a-subunit isoforms to this pathway not tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The isoform-resolved structure of mammalian ATP6V0A1-containing V-ATPase, the conservation of PI(3,5)P₂ activation in human cells, and the precise mechanism by which individual disease-causing missense mutations disrupt proton translocation remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No mammalian isoform-specific cryo-EM structure\",\n        \"PI(3,5)P₂ activation not validated for human ATP6V0A1\",\n        \"Genotype-to-structural-defect mapping for patient variants lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 8, 9]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [3, 10, 11]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0005773\", \"supporting_discovery_ids\": [0, 5, 8]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [6, 10]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 1, 5, 8, 9]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [6, 10]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [10, 11, 12]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 12]}\n    ],\n    \"complexes\": [\n      \"V-ATPase (V0 domain)\"\n    ],\n    \"partners\": [\n      \"RABGEF1\",\n      \"CRYBA1\",\n      \"ATP6V1A\",\n      \"ATP6V1B2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}