{"gene":"VAMP1","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1988,"finding":"VAMP-1 (vesicle-associated membrane protein 1) is a synaptic vesicle-associated integral membrane protein of 120 amino acids with three domains: a proline-rich amino terminus, a highly charged internal region, and a hydrophobic carboxyl-terminal membrane anchor. Tryptic digestion of intact vs. lysed vesicles demonstrated that the protein faces the cytoplasm, consistent with a role in packaging, transport, or release of neurotransmitters.","method":"cDNA cloning from Torpedo electromotor nucleus library; tryptic digestion of intact and lysed synaptic vesicles; primary sequence analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — original biochemical characterization using direct protease-protection assay on purified vesicles, replicated by subsequent field","pmids":["3380805"],"is_preprint":false},{"year":1998,"finding":"A splice isoform of VAMP-1 (VAMP-1B) contains a shortened hydrophobic membrane anchor and three charged C-terminal residues (Arg-Arg-Asp) that redirect the protein to mitochondria, whereas VAMP-1A localizes to the plasma membrane and endosome-like structures. C-terminal mutagenesis showed that mitochondrial targeting requires both added positive charge and a shortened hydrophobic anchor.","method":"cDNA cloning from human endothelial cell library; epitope-tagged transfection into human endothelial cells; subcellular localization by fluorescence microscopy; C-terminal deletion/mutation analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization experiment with functional mutagenesis in a single lab using multiple constructs and orthogonal methods","pmids":["9658161"],"is_preprint":false},{"year":2006,"finding":"A nonsense mutation in VAMP1 (lethal-wasting mouse) abolishes detectable VAMP1 protein and causes severe neurological impairment and pre-weaning lethality, establishing that VAMP1 is essential for function in specific CNS tissues including retina and discrete brain regions.","method":"Positional cloning; RT-PCR quantification; Western blot (no protein detected); nonsense mutation identification in coding region","journal":"Neurogenetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — null allele identified by positional cloning, confirmed by Western blot absence, replicated physiologically in subsequent studies","pmids":["17102983"],"is_preprint":false},{"year":2010,"finding":"VAMP-1 and VAMP-2 co-sediment and co-localize with ANP-containing granules in cardiac myocytes, form a SNARE complex with syntaxin-4, and knockdown of VAMP-1 (or VAMP-2 or syntaxin-4) blocks regulated ANP release. VAMP-3 knockdown had no effect on ANP release.","method":"Subcellular fractionation co-sedimentation; immunofluorescence co-localization; SNARE complex immunoprecipitation; siRNA knockdown with ANP secretion assay","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, co-sedimentation, and functional KD with specific secretion readout; negative control (VAMP-3 KD) included","pmids":["20801128"],"is_preprint":false},{"year":2011,"finding":"Syb1/VAMP1 plays an essential, non-redundant role in Ca2+-triggered vesicle exocytosis at the mouse neuromuscular junction. Null mutation of Syb1 significantly reduces both spontaneous and evoked synaptic activities, enhances paired-pulse facilitation (indicating reduced initial release probability), causes pronounced asynchrony in neurotransmitter release, and reduces calcium sensitivity and cooperativity, without altering the size of the readily releasable pool.","method":"Electrophysiology (spontaneous and evoked neuromuscular junction recordings, paired-pulse facilitation, Ca2+ dose-response) in Syb1 null mutant mice vs. controls","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean null mutation with multiple electrophysiological readouts distinguishing mechanism (Ca2+ sensitivity/cooperativity) from pool size","pmids":["21282288"],"is_preprint":false},{"year":2016,"finding":"VAMP1 (but not VAMP2 or VAMP3) is required for TNFα-induced surface trafficking of TRPV1 and TRPA1 channels and for CGRP exocytosis from large dense-core vesicles in sensory neurons. This trafficking requires syntaxin-1 and SNAP-25 on the plasma membrane and Munc18-1; botulinum neurotoxins /C1 and /A inhibit both CGRP release and TNFα-elevated channel delivery.","method":"Fluorescence co-localization; surface biotinylation; siRNA knockdown of VAMP1/2/3 with TNFα stimulation; BoNT/A and /C1 cleavage of SNAP-25 and syntaxin-1; CGRP ELISA; Ca2+ influx measurement","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (co-localization, surface biotinylation, isoform-selective KD, toxin cleavage, functional secretion assay) in one study","pmids":["26888187"],"is_preprint":false},{"year":2018,"finding":"VAMP1 is specifically expressed in inhibitory (GABAergic) neurons and is a major target of the RNA-binding protein RBFOX1. Cytoplasmic RBFOX1 stabilizes Vamp1 mRNA in part by blocking microRNA-9 at the 3' UTR. Vamp1 knockdown decreases inhibitory synaptic transmission and causes E/I imbalance; re-expression of Vamp1 selectively in interneurons rescues electrophysiological deficits in Rbfox1 cKO mice.","method":"RNA-binding/3'UTR assays; microRNA-9 blocking experiments; electrophysiology in Rbfox1 cKO mice; Vamp1 KD by siRNA; rescue by interneuron-selective Vamp1 re-expression","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis (rescue experiment), molecular mechanism (miR-9 blocking, 3'UTR binding), and electrophysiological phenotype in multiple orthogonal experiments","pmids":["29621484"],"is_preprint":false},{"year":2001,"finding":"VAMP-1 is localized to membranes of gelatinase and specific secretory granules in human neutrophils, suggesting it functions as a SNARE component during exocytosis of these granules.","method":"Subcellular fractionation; immunolocalization in human neutrophils","journal":"Bulletin of experimental biology and medicine","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single fractionation/localization study, single lab, no functional KD readout","pmids":["11391393"],"is_preprint":false},{"year":2014,"finding":"Calcineurin/NFAT signaling, activated downstream of PMCA2 or PMCA3 downregulation, represses Vamp1 (and Vamp2) gene expression in PC12 neuroendocrine cells, leading to impaired SNARE complex formation and reduced dopamine secretion. Chromatin immunoprecipitation indicated direct NFAT binding at the Vamp gene loci.","method":"PMCA2/PMCA3 siRNA knockdown; Ca2+ measurements; calcineurin/NFAT activation assays; chromatin immunoprecipitation (ChIP) at Vamp promoters; dopamine secretion assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP evidence for NFAT at Vamp promoters plus functional secretion readout, single lab","pmids":["24667359"],"is_preprint":false},{"year":2010,"finding":"The structure and orientation of VAMP1 at a lipid monolayer air-water interface are controlled by protein-lipid interactions: the protein undergoes alpha-helix to beta-sheet transition under surface compression in neutral lipid (DMPC) monolayers, while anionic lipid (DMPG) inhibits this transition in a concentration-dependent manner and alters protein orientation.","method":"Lipid monolayer assay at air-water interface; infrared spectroscopy; surface pressure measurements with neutral (DMPC) and anionic (DMPG) phospholipids","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — biophysical reconstitution with multiple lipid compositions, single lab, no in-cell validation","pmids":["20085749"],"is_preprint":false},{"year":2026,"finding":"Neuron-specific expression of ECFP-Syb2 (VAMP2) fully rescues lethality, growth, motor function, and neuromuscular synaptic transmission (spontaneous and evoked release and short-term plasticity) in Syb1/VAMP1 null mice, establishing that (1) the lethal phenotype is caused primarily by presynaptic neuronal loss of Syb1, and (2) Syb2 can functionally substitute for Syb1 at motor nerve terminals in vivo.","method":"Neuron-specific transgenic rescue (ECFP-Syb2 expressed under neuron-specific promoter in Syb1 null mice); electrophysiology of NMJ (mEPPs, EPPs, short-term plasticity); behavioral/growth assessment","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean genetic rescue experiment with electrophysiological validation of complete functional recovery; preprint but rigorous design","pmids":["42244714"],"is_preprint":true}],"current_model":"VAMP1/SYB1 is a synaptic vesicle-associated v-SNARE that faces the cytoplasm via a C-terminal membrane anchor and drives Ca2+-triggered neurotransmitter release by forming a SNARE complex with syntaxin and SNAP-25; it is essential and non-redundant at the neuromuscular junction (where loss reduces Ca2+ sensitivity and cooperativity of exocytosis), mediates GABA release from inhibitory interneurons downstream of RBFOX1-dependent mRNA stabilization, participates in dense-core vesicle exocytosis (CGRP, ANP) via complexes with syntaxin-1/4 and SNAP-25, and its subcellular targeting is governed by C-terminal alternative splicing that redirects one isoform (VAMP-1B) to mitochondria."},"narrative":{"mechanistic_narrative":"VAMP1 is a synaptic vesicle-associated v-SNARE that drives Ca2+-triggered neurotransmitter and hormone exocytosis across neuronal and secretory cell types [PMID:3380805, PMID:21282288]. It is an integral membrane protein anchored by a hydrophobic C-terminus, with the bulk of the protein facing the cytoplasm where it engages the membrane-fusion machinery [PMID:3380805]. At the neuromuscular junction VAMP1 plays an essential, non-redundant role: its loss reduces both spontaneous and evoked release, lowers initial release probability, and degrades the Ca2+ sensitivity and cooperativity of exocytosis without changing the size of the readily releasable pool [PMID:21282288]. In secretory contexts VAMP1 assembles into SNARE complexes with syntaxin and SNAP-25 to mediate regulated exocytosis — driving ANP release from cardiac myocytes via complexes with syntaxin-4 [PMID:20801128] and CGRP release together with TRPV1/TRPA1 channel surface delivery in sensory neurons via syntaxin-1, SNAP-25, and Munc18-1, a process blocked by botulinum neurotoxins [PMID:26888187]. VAMP1 is selectively expressed in GABAergic interneurons, where its mRNA is stabilized by RBFOX1 acting against microRNA-9 at the 3' UTR, linking VAMP1 abundance to inhibitory synaptic transmission and excitatory/inhibitory balance [PMID:29621484]. C-terminal alternative splicing diversifies its targeting: the VAMP-1B isoform carries a shortened hydrophobic anchor plus added positive charge that redirects it to mitochondria, whereas VAMP-1A localizes to the plasma membrane and endosome-like structures [PMID:9658161]. Loss of VAMP1 in mice causes severe neurological impairment and lethality, attributable principally to presynaptic neuronal loss [PMID:17102983, PMID:42244714].","teleology":[{"year":1988,"claim":"Established VAMP1 as a synaptic vesicle membrane protein with a defined topology, framing it as a candidate machinery component for neurotransmitter packaging, transport, or release.","evidence":"cDNA cloning from Torpedo electromotor nucleus and protease-protection (tryptic digestion of intact vs. lysed vesicles)","pmids":["3380805"],"confidence":"High","gaps":["No fusion partners or SNARE complex identified at this stage","Functional role in release not yet tested"]},{"year":1998,"claim":"Showed that C-terminal alternative splicing dictates VAMP1 organelle targeting, explaining how a single gene can serve both plasma-membrane/endosomal and mitochondrial localizations.","evidence":"Epitope-tagged isoform transfection in endothelial cells with C-terminal deletion/mutation analysis and fluorescence localization","pmids":["9658161"],"confidence":"High","gaps":["Functional consequence of mitochondrial VAMP-1B localization not defined","Localization shown in heterologous endothelial cells, not neurons"]},{"year":2006,"claim":"Demonstrated that VAMP1 is essential in vivo, with null mutation causing severe neurological deficits and lethality in specific CNS tissues.","evidence":"Positional cloning of the lethal-wasting mouse nonsense mutation with Western blot confirmation of protein absence","pmids":["17102983"],"confidence":"High","gaps":["Cellular/synaptic mechanism of lethality not resolved","Tissue site driving the phenotype not pinpointed"]},{"year":2010,"claim":"Defined a SNARE-mediated secretory role outside neurons, showing VAMP1 with syntaxin-4 mediates regulated ANP granule exocytosis, with isoform specificity (VAMP-3 dispensable).","evidence":"Co-sedimentation, co-localization, SNARE complex IP, and siRNA knockdown with ANP secretion assay in cardiac myocytes","pmids":["20801128"],"confidence":"High","gaps":["Regulation of VAMP1/syntaxin-4 assembly not characterized","Relative contribution of VAMP1 vs VAMP2 not dissected"]},{"year":2010,"claim":"Probed how lipid environment shapes VAMP1 conformation and orientation, indicating protein-lipid interactions modulate its membrane behavior.","evidence":"Lipid monolayer reconstitution with infrared spectroscopy and surface-pressure measurements in neutral vs anionic lipids","pmids":["20085749"],"confidence":"Medium","gaps":["Biophysical reconstitution only; no in-cell validation","Relevance to SNARE function not established"]},{"year":2011,"claim":"Resolved the synaptic mechanism of VAMP1, showing it is non-redundant for Ca2+ sensitivity and cooperativity of release at the NMJ rather than for vesicle pool maintenance.","evidence":"Multi-parameter electrophysiology (evoked/spontaneous release, paired-pulse facilitation, Ca2+ dose-response) in Syb1 null mice","pmids":["21282288"],"confidence":"High","gaps":["Molecular basis for the Ca2+ sensitivity defect not defined","Whether other VAMPs compensate not addressed here"]},{"year":2014,"claim":"Identified transcriptional control of VAMP1 by calcineurin/NFAT downstream of PMCA, linking Ca2+ pump activity to SNARE abundance and secretion.","evidence":"PMCA2/3 knockdown, NFAT activation assays, ChIP at Vamp loci, and dopamine secretion assay in PC12 cells","pmids":["24667359"],"confidence":"Medium","gaps":["Single cell line; in vivo relevance untested","Direct vs indirect NFAT regulation not fully resolved"]},{"year":2016,"claim":"Extended VAMP1's role to sensory-neuron secretion and channel trafficking, showing isoform-specific control of CGRP release and TNFα-induced TRPV1/TRPA1 surface delivery via syntaxin-1/SNAP-25/Munc18-1.","evidence":"Isoform-selective siRNA, surface biotinylation, BoNT cleavage, CGRP ELISA, and Ca2+ influx in sensory neurons","pmids":["26888187"],"confidence":"High","gaps":["Direct VAMP1-channel association vs SNARE-dependent trafficking not separated","Mechanism coupling TNFα signaling to VAMP1-dependent trafficking unknown"]},{"year":2018,"claim":"Connected VAMP1 to inhibitory circuit function and an upstream RNA regulatory axis, showing RBFOX1 stabilizes Vamp1 mRNA against miR-9 to maintain GABAergic transmission and E/I balance.","evidence":"3'UTR/RNA-binding and miR-9 blocking assays, Vamp1 knockdown, and interneuron-selective rescue in Rbfox1 cKO mice with electrophysiology","pmids":["29621484"],"confidence":"High","gaps":["Whether RBFOX1-VAMP1 axis operates in other neuron classes not addressed","Quantitative contribution of miR-9 vs other regulators unresolved"]},{"year":2026,"claim":"Pinpointed the lethal VAMP1-null phenotype to presynaptic neuronal loss and showed VAMP2 can functionally substitute for VAMP1 at motor terminals in vivo.","evidence":"Neuron-specific ECFP-Syb2 transgenic rescue of Syb1 null mice with NMJ electrophysiology and behavioral/growth readouts (preprint)","pmids":["42244714"],"confidence":"High","gaps":["Preprint; not yet peer-reviewed","Whether substitution holds at non-NMJ synapses not tested","Does not explain why VAMP1 is selectively used at certain synapses"]},{"year":null,"claim":"The functional role of mitochondrially targeted VAMP-1B and the structural basis of VAMP1's reduced Ca2+ cooperativity relative to other VAMPs remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No assigned function for the mitochondrial VAMP-1B isoform","No structural model explaining isoform-specific Ca2+ sensitivity at synapses"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,3]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,3]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,5]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[1]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,6]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,5]}],"complexes":["SNARE complex (VAMP1/syntaxin/SNAP-25)"],"partners":["STX4","STX1A","SNAP25","VAMP2","RBFOX1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P23763","full_name":"Vesicle-associated membrane protein 1","aliases":["Synaptobrevin-1"],"length_aa":118,"mass_kda":12.9,"function":"Involved in the targeting and/or fusion of transport vesicles to their target membrane","subcellular_location":"Mitochondrion outer membrane","url":"https://www.uniprot.org/uniprotkb/P23763/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VAMP1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/VAMP1","total_profiled":1310},"omim":[{"mim_id":"618323","title":"MYASTHENIC SYNDROME, CONGENITAL, 25, PRESYNAPTIC; CMS25","url":"https://www.omim.org/entry/618323"},{"mim_id":"609586","title":"COMPLEXIN 4; CPLX4","url":"https://www.omim.org/entry/609586"},{"mim_id":"609585","title":"COMPLEXIN 3; CPLX3","url":"https://www.omim.org/entry/609585"},{"mim_id":"607081","title":"TAP-BINDING PROTEIN-LIKE; TAPBPL","url":"https://www.omim.org/entry/607081"},{"mim_id":"605703","title":"VAMP-ASSOCIATED PROTEIN A; VAPA","url":"https://www.omim.org/entry/605703"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":108.8}],"url":"https://www.proteinatlas.org/search/VAMP1"},"hgnc":{"alias_symbol":["VAMP-1"],"prev_symbol":["SYB1"]},"alphafold":{"accession":"P23763","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P23763","model_url":"https://alphafold.ebi.ac.uk/files/AF-P23763-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P23763-F1-predicted_aligned_error_v6.png","plddt_mean":74.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VAMP1","jax_strain_url":"https://www.jax.org/strain/search?query=VAMP1"},"sequence":{"accession":"P23763","fasta_url":"https://rest.uniprot.org/uniprotkb/P23763.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P23763/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P23763"}},"corpus_meta":[{"pmid":"3380805","id":"PMC_3380805","title":"VAMP-1: a synaptic vesicle-associated integral membrane protein.","date":"1988","source":"Proceedings of the 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Disease","date":"2025-10-16","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.16.682426","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":18844,"output_tokens":3109,"usd":0.051583,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10521,"output_tokens":3629,"usd":0.071665,"stage2_stop_reason":"end_turn"},"total_usd":0.123248,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1988,\n      \"finding\": \"VAMP-1 (vesicle-associated membrane protein 1) is a synaptic vesicle-associated integral membrane protein of 120 amino acids with three domains: a proline-rich amino terminus, a highly charged internal region, and a hydrophobic carboxyl-terminal membrane anchor. Tryptic digestion of intact vs. lysed vesicles demonstrated that the protein faces the cytoplasm, consistent with a role in packaging, transport, or release of neurotransmitters.\",\n      \"method\": \"cDNA cloning from Torpedo electromotor nucleus library; tryptic digestion of intact and lysed synaptic vesicles; primary sequence analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — original biochemical characterization using direct protease-protection assay on purified vesicles, replicated by subsequent field\",\n      \"pmids\": [\"3380805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"A splice isoform of VAMP-1 (VAMP-1B) contains a shortened hydrophobic membrane anchor and three charged C-terminal residues (Arg-Arg-Asp) that redirect the protein to mitochondria, whereas VAMP-1A localizes to the plasma membrane and endosome-like structures. C-terminal mutagenesis showed that mitochondrial targeting requires both added positive charge and a shortened hydrophobic anchor.\",\n      \"method\": \"cDNA cloning from human endothelial cell library; epitope-tagged transfection into human endothelial cells; subcellular localization by fluorescence microscopy; C-terminal deletion/mutation analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment with functional mutagenesis in a single lab using multiple constructs and orthogonal methods\",\n      \"pmids\": [\"9658161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A nonsense mutation in VAMP1 (lethal-wasting mouse) abolishes detectable VAMP1 protein and causes severe neurological impairment and pre-weaning lethality, establishing that VAMP1 is essential for function in specific CNS tissues including retina and discrete brain regions.\",\n      \"method\": \"Positional cloning; RT-PCR quantification; Western blot (no protein detected); nonsense mutation identification in coding region\",\n      \"journal\": \"Neurogenetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — null allele identified by positional cloning, confirmed by Western blot absence, replicated physiologically in subsequent studies\",\n      \"pmids\": [\"17102983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"VAMP-1 and VAMP-2 co-sediment and co-localize with ANP-containing granules in cardiac myocytes, form a SNARE complex with syntaxin-4, and knockdown of VAMP-1 (or VAMP-2 or syntaxin-4) blocks regulated ANP release. VAMP-3 knockdown had no effect on ANP release.\",\n      \"method\": \"Subcellular fractionation co-sedimentation; immunofluorescence co-localization; SNARE complex immunoprecipitation; siRNA knockdown with ANP secretion assay\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, co-sedimentation, and functional KD with specific secretion readout; negative control (VAMP-3 KD) included\",\n      \"pmids\": [\"20801128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Syb1/VAMP1 plays an essential, non-redundant role in Ca2+-triggered vesicle exocytosis at the mouse neuromuscular junction. Null mutation of Syb1 significantly reduces both spontaneous and evoked synaptic activities, enhances paired-pulse facilitation (indicating reduced initial release probability), causes pronounced asynchrony in neurotransmitter release, and reduces calcium sensitivity and cooperativity, without altering the size of the readily releasable pool.\",\n      \"method\": \"Electrophysiology (spontaneous and evoked neuromuscular junction recordings, paired-pulse facilitation, Ca2+ dose-response) in Syb1 null mutant mice vs. controls\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean null mutation with multiple electrophysiological readouts distinguishing mechanism (Ca2+ sensitivity/cooperativity) from pool size\",\n      \"pmids\": [\"21282288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"VAMP1 (but not VAMP2 or VAMP3) is required for TNFα-induced surface trafficking of TRPV1 and TRPA1 channels and for CGRP exocytosis from large dense-core vesicles in sensory neurons. This trafficking requires syntaxin-1 and SNAP-25 on the plasma membrane and Munc18-1; botulinum neurotoxins /C1 and /A inhibit both CGRP release and TNFα-elevated channel delivery.\",\n      \"method\": \"Fluorescence co-localization; surface biotinylation; siRNA knockdown of VAMP1/2/3 with TNFα stimulation; BoNT/A and /C1 cleavage of SNAP-25 and syntaxin-1; CGRP ELISA; Ca2+ influx measurement\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (co-localization, surface biotinylation, isoform-selective KD, toxin cleavage, functional secretion assay) in one study\",\n      \"pmids\": [\"26888187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"VAMP1 is specifically expressed in inhibitory (GABAergic) neurons and is a major target of the RNA-binding protein RBFOX1. Cytoplasmic RBFOX1 stabilizes Vamp1 mRNA in part by blocking microRNA-9 at the 3' UTR. Vamp1 knockdown decreases inhibitory synaptic transmission and causes E/I imbalance; re-expression of Vamp1 selectively in interneurons rescues electrophysiological deficits in Rbfox1 cKO mice.\",\n      \"method\": \"RNA-binding/3'UTR assays; microRNA-9 blocking experiments; electrophysiology in Rbfox1 cKO mice; Vamp1 KD by siRNA; rescue by interneuron-selective Vamp1 re-expression\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis (rescue experiment), molecular mechanism (miR-9 blocking, 3'UTR binding), and electrophysiological phenotype in multiple orthogonal experiments\",\n      \"pmids\": [\"29621484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"VAMP-1 is localized to membranes of gelatinase and specific secretory granules in human neutrophils, suggesting it functions as a SNARE component during exocytosis of these granules.\",\n      \"method\": \"Subcellular fractionation; immunolocalization in human neutrophils\",\n      \"journal\": \"Bulletin of experimental biology and medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single fractionation/localization study, single lab, no functional KD readout\",\n      \"pmids\": [\"11391393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Calcineurin/NFAT signaling, activated downstream of PMCA2 or PMCA3 downregulation, represses Vamp1 (and Vamp2) gene expression in PC12 neuroendocrine cells, leading to impaired SNARE complex formation and reduced dopamine secretion. Chromatin immunoprecipitation indicated direct NFAT binding at the Vamp gene loci.\",\n      \"method\": \"PMCA2/PMCA3 siRNA knockdown; Ca2+ measurements; calcineurin/NFAT activation assays; chromatin immunoprecipitation (ChIP) at Vamp promoters; dopamine secretion assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP evidence for NFAT at Vamp promoters plus functional secretion readout, single lab\",\n      \"pmids\": [\"24667359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The structure and orientation of VAMP1 at a lipid monolayer air-water interface are controlled by protein-lipid interactions: the protein undergoes alpha-helix to beta-sheet transition under surface compression in neutral lipid (DMPC) monolayers, while anionic lipid (DMPG) inhibits this transition in a concentration-dependent manner and alters protein orientation.\",\n      \"method\": \"Lipid monolayer assay at air-water interface; infrared spectroscopy; surface pressure measurements with neutral (DMPC) and anionic (DMPG) phospholipids\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — biophysical reconstitution with multiple lipid compositions, single lab, no in-cell validation\",\n      \"pmids\": [\"20085749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Neuron-specific expression of ECFP-Syb2 (VAMP2) fully rescues lethality, growth, motor function, and neuromuscular synaptic transmission (spontaneous and evoked release and short-term plasticity) in Syb1/VAMP1 null mice, establishing that (1) the lethal phenotype is caused primarily by presynaptic neuronal loss of Syb1, and (2) Syb2 can functionally substitute for Syb1 at motor nerve terminals in vivo.\",\n      \"method\": \"Neuron-specific transgenic rescue (ECFP-Syb2 expressed under neuron-specific promoter in Syb1 null mice); electrophysiology of NMJ (mEPPs, EPPs, short-term plasticity); behavioral/growth assessment\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic rescue experiment with electrophysiological validation of complete functional recovery; preprint but rigorous design\",\n      \"pmids\": [\"42244714\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"VAMP1/SYB1 is a synaptic vesicle-associated v-SNARE that faces the cytoplasm via a C-terminal membrane anchor and drives Ca2+-triggered neurotransmitter release by forming a SNARE complex with syntaxin and SNAP-25; it is essential and non-redundant at the neuromuscular junction (where loss reduces Ca2+ sensitivity and cooperativity of exocytosis), mediates GABA release from inhibitory interneurons downstream of RBFOX1-dependent mRNA stabilization, participates in dense-core vesicle exocytosis (CGRP, ANP) via complexes with syntaxin-1/4 and SNAP-25, and its subcellular targeting is governed by C-terminal alternative splicing that redirects one isoform (VAMP-1B) to mitochondria.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"VAMP1 is a synaptic vesicle-associated v-SNARE that drives Ca2+-triggered neurotransmitter and hormone exocytosis across neuronal and secretory cell types [#0, #4]. It is an integral membrane protein anchored by a hydrophobic C-terminus, with the bulk of the protein facing the cytoplasm where it engages the membrane-fusion machinery [#0]. At the neuromuscular junction VAMP1 plays an essential, non-redundant role: its loss reduces both spontaneous and evoked release, lowers initial release probability, and degrades the Ca2+ sensitivity and cooperativity of exocytosis without changing the size of the readily releasable pool [#4]. In secretory contexts VAMP1 assembles into SNARE complexes with syntaxin and SNAP-25 to mediate regulated exocytosis — driving ANP release from cardiac myocytes via complexes with syntaxin-4 [#3] and CGRP release together with TRPV1/TRPA1 channel surface delivery in sensory neurons via syntaxin-1, SNAP-25, and Munc18-1, a process blocked by botulinum neurotoxins [#5]. VAMP1 is selectively expressed in GABAergic interneurons, where its mRNA is stabilized by RBFOX1 acting against microRNA-9 at the 3' UTR, linking VAMP1 abundance to inhibitory synaptic transmission and excitatory/inhibitory balance [#6]. C-terminal alternative splicing diversifies its targeting: the VAMP-1B isoform carries a shortened hydrophobic anchor plus added positive charge that redirects it to mitochondria, whereas VAMP-1A localizes to the plasma membrane and endosome-like structures [#1]. Loss of VAMP1 in mice causes severe neurological impairment and lethality, attributable principally to presynaptic neuronal loss [#2, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"Established VAMP1 as a synaptic vesicle membrane protein with a defined topology, framing it as a candidate machinery component for neurotransmitter packaging, transport, or release.\",\n      \"evidence\": \"cDNA cloning from Torpedo electromotor nucleus and protease-protection (tryptic digestion of intact vs. lysed vesicles)\",\n      \"pmids\": [\"3380805\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No fusion partners or SNARE complex identified at this stage\", \"Functional role in release not yet tested\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showed that C-terminal alternative splicing dictates VAMP1 organelle targeting, explaining how a single gene can serve both plasma-membrane/endosomal and mitochondrial localizations.\",\n      \"evidence\": \"Epitope-tagged isoform transfection in endothelial cells with C-terminal deletion/mutation analysis and fluorescence localization\",\n      \"pmids\": [\"9658161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of mitochondrial VAMP-1B localization not defined\", \"Localization shown in heterologous endothelial cells, not neurons\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated that VAMP1 is essential in vivo, with null mutation causing severe neurological deficits and lethality in specific CNS tissues.\",\n      \"evidence\": \"Positional cloning of the lethal-wasting mouse nonsense mutation with Western blot confirmation of protein absence\",\n      \"pmids\": [\"17102983\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular/synaptic mechanism of lethality not resolved\", \"Tissue site driving the phenotype not pinpointed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined a SNARE-mediated secretory role outside neurons, showing VAMP1 with syntaxin-4 mediates regulated ANP granule exocytosis, with isoform specificity (VAMP-3 dispensable).\",\n      \"evidence\": \"Co-sedimentation, co-localization, SNARE complex IP, and siRNA knockdown with ANP secretion assay in cardiac myocytes\",\n      \"pmids\": [\"20801128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulation of VAMP1/syntaxin-4 assembly not characterized\", \"Relative contribution of VAMP1 vs VAMP2 not dissected\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Probed how lipid environment shapes VAMP1 conformation and orientation, indicating protein-lipid interactions modulate its membrane behavior.\",\n      \"evidence\": \"Lipid monolayer reconstitution with infrared spectroscopy and surface-pressure measurements in neutral vs anionic lipids\",\n      \"pmids\": [\"20085749\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biophysical reconstitution only; no in-cell validation\", \"Relevance to SNARE function not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Resolved the synaptic mechanism of VAMP1, showing it is non-redundant for Ca2+ sensitivity and cooperativity of release at the NMJ rather than for vesicle pool maintenance.\",\n      \"evidence\": \"Multi-parameter electrophysiology (evoked/spontaneous release, paired-pulse facilitation, Ca2+ dose-response) in Syb1 null mice\",\n      \"pmids\": [\"21282288\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for the Ca2+ sensitivity defect not defined\", \"Whether other VAMPs compensate not addressed here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified transcriptional control of VAMP1 by calcineurin/NFAT downstream of PMCA, linking Ca2+ pump activity to SNARE abundance and secretion.\",\n      \"evidence\": \"PMCA2/3 knockdown, NFAT activation assays, ChIP at Vamp loci, and dopamine secretion assay in PC12 cells\",\n      \"pmids\": [\"24667359\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cell line; in vivo relevance untested\", \"Direct vs indirect NFAT regulation not fully resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended VAMP1's role to sensory-neuron secretion and channel trafficking, showing isoform-specific control of CGRP release and TNF\\u03b1-induced TRPV1/TRPA1 surface delivery via syntaxin-1/SNAP-25/Munc18-1.\",\n      \"evidence\": \"Isoform-selective siRNA, surface biotinylation, BoNT cleavage, CGRP ELISA, and Ca2+ influx in sensory neurons\",\n      \"pmids\": [\"26888187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct VAMP1-channel association vs SNARE-dependent trafficking not separated\", \"Mechanism coupling TNF\\u03b1 signaling to VAMP1-dependent trafficking unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected VAMP1 to inhibitory circuit function and an upstream RNA regulatory axis, showing RBFOX1 stabilizes Vamp1 mRNA against miR-9 to maintain GABAergic transmission and E/I balance.\",\n      \"evidence\": \"3'UTR/RNA-binding and miR-9 blocking assays, Vamp1 knockdown, and interneuron-selective rescue in Rbfox1 cKO mice with electrophysiology\",\n      \"pmids\": [\"29621484\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RBFOX1-VAMP1 axis operates in other neuron classes not addressed\", \"Quantitative contribution of miR-9 vs other regulators unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Pinpointed the lethal VAMP1-null phenotype to presynaptic neuronal loss and showed VAMP2 can functionally substitute for VAMP1 at motor terminals in vivo.\",\n      \"evidence\": \"Neuron-specific ECFP-Syb2 transgenic rescue of Syb1 null mice with NMJ electrophysiology and behavioral/growth readouts (preprint)\",\n      \"pmids\": [\"42244714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Preprint; not yet peer-reviewed\", \"Whether substitution holds at non-NMJ synapses not tested\", \"Does not explain why VAMP1 is selectively used at certain synapses\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The functional role of mitochondrially targeted VAMP-1B and the structural basis of VAMP1's reduced Ca2+ cooperativity relative to other VAMPs remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No assigned function for the mitochondrial VAMP-1B isoform\", \"No structural model explaining isoform-specific Ca2+ sensitivity at synapses\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"complexes\": [\"SNARE complex (VAMP1/syntaxin/SNAP-25)\"],\n    \"partners\": [\"STX4\", \"STX1A\", \"SNAP25\", \"VAMP2\", \"RBFOX1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}