{"gene":"SLC17A6","run_date":"2026-06-10T07:46:32","timeline":{"discoveries":[{"year":2001,"finding":"DNPI (SLC17A6/VGLUT2) functions as a vesicular glutamate transporter: when expressed in BON cells, membrane fractions displayed ATP-dependent, FCCP-sensitive glutamate uptake; overexpression in cultured GABAergic neurons caused release of glutamate activating AMPA receptors, demonstrating that VGLUT2 expression alone is sufficient to confer glutamatergic transmission.","method":"Heterologous expression in BON cells (ATP-dependent uptake assay), overexpression in autaptic GABAergic neurons with electrophysiology (bicuculline-insensitive, NBQX-sensitive postsynaptic currents)","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of transport activity plus functional electrophysiological readout in neurons, replicated across two independent assay systems in one study","pmids":["11698620"],"is_preprint":false},{"year":2001,"finding":"DNPI/VGLUT2, when expressed in COS7 cells, transports L-glutamate at the expense of an electrochemical proton gradient established by the vacuolar proton pump, confirming it as a bona fide vesicular glutamate transporter. It is present on synaptic-like microvesicles (SLMVs) in pinealocytes and pancreatic alpha cells and is responsible for vesicular glutamate storage in these endocrine cells.","method":"Heterologous expression in COS7 cells (proton-gradient-dependent glutamate uptake assay), immunoelectron microscopy and subcellular fractionation showing co-fractionation with SLMVs","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted transport activity in heterologous cells confirmed by EM/fractionation, two orthogonal methods","pmids":["11551935"],"is_preprint":false},{"year":2003,"finding":"VGLUT2 is highly enriched in synaptic vesicles and resides on a vesicle population distinct from those containing VGAT or VGLUT1, showing that VGLUT1 and VGLUT2 mark non-overlapping vesicle populations.","method":"Subcellular fractionation, immunoisolation of synaptic vesicles, co-immunolocalization","journal":"The Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular fractionation and immunoisolation in a single study; consistent with reconstitution data in same paper","pmids":["11698620"],"is_preprint":false},{"year":2007,"finding":"VGLUT2 expressed in Xenopus oocytes mediates two independent transport modes: (1) uptake of L-glutamate (but not D-aspartate) into intracellular organelles in digitonin-permeabilized oocytes, and (2) efflux of L-glutamate (but not L-aspartate) from intact oocytes, consistent with H+/L-glutamate antiport and a potential plasma-membrane leakage mode. Transport was blocked by rose bengal and trypan blue.","method":"Heterologous expression in Xenopus oocytes, radiolabeled glutamate influx and efflux assays, pharmacological inhibition","journal":"Neurochemical Research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous in vitro functional assay but single lab, single expression system","pmids":["18080752"],"is_preprint":false},{"year":2009,"finding":"Conditional deletion of VGLUT2 in dopamine neurons (DAT-Cre/Vglut2-lox mice) does not affect basal motor function but greatly blunts locomotor response to amphetamine and alters risk-taking behavior, demonstrating that VGLUT2 expression in DA neurons is required for psychostimulant-induced behavioral activation.","method":"Conditional knockout (DAT-Cre/Vglut2-flox), in vivo amperometry, behavioral assays (open-field, amphetamine locomotion)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with multiple behavioral paradigms and neurochemical readout","pmids":["20018672"],"is_preprint":false},{"year":2010,"finding":"Conditional deletion of VGLUT2 in TRPV1-lineage primary afferents causes dramatic increase in itch behavior and reduced responsiveness to thermal pain, establishing that VGLUT2 in these nociceptors is required for thermal nociception and suppression of itch.","method":"Conditional knockout (TRPV1-Cre/Vglut2-flox), behavioral assays (thermal pain, mechanical pain, itch), pharmacological rescue with antihistamines and GRPR-KO epistasis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO, multiple behavioral phenotypes, genetic epistasis with GRPR","pmids":["21040852"],"is_preprint":false},{"year":2010,"finding":"Conditional knockout of Slc17a6 (VGLUT2) from the majority of DRG nociceptors profoundly decreases VGLUT2 protein, reduces lamina I spinal cord neuron firing to noxious heat and mechanical stimuli, and impairs acute noxious heat, mechanical, and capsaicin responses. Heat hyperalgesia after tissue or nerve injury is lost, but mechanical hypersensitivity is intact, revealing a VGLUT2-dependent mechanism specifically for heat pain.","method":"Conditional knockout (Nav1.8-Cre/Vglut2-flox), in vivo electrophysiology of spinal neurons, behavioral nociceptive assays, nerve injury models","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with in vivo electrophysiology and multiple behavioral paradigms across two independent injury models","pmids":["21135246"],"is_preprint":false},{"year":2010,"finding":"Activity-dependent induction of VGLUT2 mRNA and synaptic protein in mature neocortical neurons is triggered by prolonged increase in glutamatergic activity and requires signaling through ionotropic glutamate receptors, L-type voltage-gated Ca2+ channels, calmodulin, CaMK, and ERK1/2. Induced VGLUT2 protein appears on synaptic vesicles at excitatory synapses onto GABAergic interneurons.","method":"Pharmacological blockade of activity, calcium signaling inhibitors, actinomycin D transcription blockade, Western blot, immunofluorescence in neocortical culture","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological inhibitors targeting distinct pathway nodes, single lab","pmids":["20212045"],"is_preprint":false},{"year":2011,"finding":"Conditional deletion of Vglut2 in DA neurons (DAT-Cre/Vglut2-flox) enhances operant self-administration of sucrose and intravenous cocaine and increases cocaine seeking maintained by drug-paired cues by 76%; it also reduces potassium-evoked DA release in striatum and increases DA receptor binding, indicating that VGLUT2-mediated glutamate co-release from DA neurons regulates reward-dependent plasticity.","method":"Conditional knockout (DAT-Cre/Vglut2-flox), operant self-administration, in vivo DA chronoamperometry, DA receptor autoradiography, immediate-early gene in situ hybridization","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple orthogonal neurochemical and behavioral methods","pmids":["21880920"],"is_preprint":false},{"year":2012,"finding":"Conditional deletion of VGLUT2 throughout development using Emx1-Cre reduces evoked glutamate transmission, release probability, and LTD at hippocampal CA3-CA1 synapses during postnatal days 11-14. In adults, it causes reduced dendritic arbor and spine density of CA1 pyramidal neurons, impaired LTP, and spatial learning/memory deficits that are partially rescued by enhancing NMDA receptor-mediated transmission with D-serine.","method":"Conditional knockout (Emx1-Cre/Vglut2-flox), whole-cell patch-clamp electrophysiology, Golgi staining for dendritic morphology, behavioral spatial memory tests, pharmacological NMDAR enhancement","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with electrophysiology, morphology, and behavior; pharmacological rescue provides pathway placement","pmids":["23136427"],"is_preprint":false},{"year":2014,"finding":"Conditional reduction of Vglut2 in a Pitx2-co-expressing subpopulation of subthalamic nucleus neurons reduces glutamatergic transmission to substantia nigra pars reticulata and entopeduncular nucleus, causes hyperlocomotion and decreased movement initiation latency, and reduces dopamine transporter binding with slower dopamine clearance in vivo, demonstrating that VGLUT2-expressing STN neurons regulate both motor output and dopaminergic transmission.","method":"Conditional knockout (Pitx2-Cre subpopulation targeting/Vglut2-flox), electrophysiology in STN targets, behavioral locomotion assays, DAT binding assay, in vivo voltammetry","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with neurochemical and behavioral phenotyping plus in vivo dopamine measurement","pmids":["24821804"],"is_preprint":false},{"year":2017,"finding":"VGLUT2 trafficking to synaptic vesicles depends on a C-terminal dileucine-like motif; disruption of this motif abolishes synaptic targeting and essentially eliminates endocytosis. VGLUT2 interacts biochemically with clathrin adaptor proteins AP-1, AP-2, and AP-3 at this motif. VGLUT2 recycling is slower than VGLUT1 and relies on AP-1 and AP-3 (not just AP-2), as shown by shRNA knockdown of individual adaptors.","method":"pHluorin-reporter live imaging, site-directed mutagenesis of dileucine-like motif, co-immunoprecipitation with AP-1/2/3, shRNA knockdown of adaptors in hippocampal and thalamic neurons","journal":"Frontiers in Cellular Neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis + biochemical interaction + live-imaging in neurons, multiple orthogonal methods, single lab","pmids":["29123471"],"is_preprint":false},{"year":2018,"finding":"Overexpression of VGLUT2 specifically in murine SNc DA neurons causes neuronal loss and Parkinsonian behaviors; conditional deletion of VGLUT2 from DA neurons increases their susceptibility to Parkinsonian neurotoxins. These opposing effects establish VGLUT2 expression level as a crucial determinant of DA neuron survival and selective vulnerability.","method":"Viral-vector VGLUT2 overexpression in SNc, conditional knockout (DA neuron-specific), neurotoxin challenge, behavioral Parkinsonism assays, histological DA neuron counts","journal":"The Journal of Clinical Investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional genetic manipulation (OE and KO) with consistent phenotypic outcomes across multiple paradigms","pmids":["29337309"],"is_preprint":false},{"year":2018,"finding":"Tamoxifen-inducible conditional deletion of Vglut2 in mature DA neurons reduces glutamatergic transmission from DA axons to nucleus accumbens medium spiny neurons (optogenetics-coupled patch clamp), and increases the baseline AMPA/NMDA ratio in DRD1-expressing MSNs, occluding subsequent cocaine-induced synaptic potentiation. This identifies VGLUT2-mediated glutamate co-release as a direct modulator of synaptic plasticity in the mesoaccumbal circuit.","method":"Tamoxifen-inducible Cre-LoxP (adult-stage deletion), optogenetics-coupled patch-clamp in nucleus accumbens, AMPA/NMDA ratio measurements","journal":"Frontiers in Neural Circuits","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — optogenetics-coupled electrophysiology directly measures co-release; inducible adult-stage KO isolates developmental confounds; single lab with multiple electrophysiological endpoints","pmids":["30210305"],"is_preprint":false},{"year":2017,"finding":"Spinal cord interneurons expressing GRPR use VGLUT2-mediated signaling to transmit itch: conditional deletion of Vglut2 in Grpr-Cre cells (Vglut2-lox;Grpr-Cre mice) reduces spontaneous itch and attenuated responses to both histaminergic and nonhistaminergic pruritogens. Gastrin-releasing peptide induces spike responses and natriuretic polypeptide B induces calcium influx in this population.","method":"Conditional knockout (Grpr-Cre/Vglut2-lox), behavioral itch assays, patch-clamp electrophysiology, calcium imaging","journal":"Pain","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with multiple behavioral and electrophysiological readouts","pmids":["28157737"],"is_preprint":false},{"year":2018,"finding":"VGluT2-expressing excitatory neurons in spinal dorsal horn lamina II are required for nociceptive transmission: chemogenetic activation of hM3D-DREADD in VGluT2-Cre neurons increases neuronal firing and synaptic glutamate release, whereas inhibitory KORD activation reduces them. Chemogenetic silencing reverses inflammatory and neuropathic pain hypersensitivity.","method":"Chemogenetic (DREADD) activation and inhibition via AAV-Cre-dependent vectors in VGluT2-Cre mice, patch-clamp recording of dorsal horn neurons, behavioral pain assays","journal":"Journal of Neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional chemogenetic manipulation with electrophysiological and behavioral readouts","pmids":["30203849"],"is_preprint":false},{"year":2004,"finding":"Dopamine neurons in postnatal rat mesencephalic cultures express VGLUT2 (but not VGLUT1 or VGLUT3), as confirmed by single-cell RT-PCR, providing the molecular basis for glutamate co-release by DA neurons. Only a proportion of terminals from individual DA neurons are VGLUT2-positive, indicating heterogeneous axonal phenotype.","method":"Immunocytochemistry, single-cell RT-PCR in isolated DA neurons","journal":"Journal of Neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single-cell RT-PCR confirms immunostaining at transcript level; single lab","pmids":["15009640"],"is_preprint":false},{"year":2020,"finding":"VGluT2 expression in DA neurons promotes axonal outgrowth and striatal reinnervation after neurotoxin lesion: >98% of DA neurons have a VGluT2+ developmental lineage (intersectional fate-mapping), VGluT2 is detected in developing DA axons at E11.5, and conditional removal of VGluT2 from DA neurons reduces striatal connections 7 weeks post-lesion.","method":"Intersectional genetic lineage mapping, embryonic immunofluorescence, conditional knockout (DA-Cre/Vglut2-flox), 6-OHDA lesion model, axon density quantification","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — lineage mapping + KO + lesion model with multiple orthogonal approaches in one study","pmids":["32928885"],"is_preprint":false},{"year":2021,"finding":"In the rotenone rat model of Parkinson's disease, VGLUT2-expressing DA neurons are more resilient to neurodegeneration than VGLUT2-negative neurons; rotenone also increases the density of VGLUT2-detectable DA neurons in VTA and SNc, suggesting upregulation of VGLUT2 as part of a neuroprotective response.","method":"Rotenone rat model, immunofluorescence double-labeling for TH/VGLUT2, stereological neuron counting, analysis of striatal terminal density","journal":"The Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — correlational neuroanatomical analysis in a lesion model, no direct manipulation of VGLUT2 in this study; consistent with other KO data","pmids":["33893220"],"is_preprint":false},{"year":2009,"finding":"Genetic reduction of VGLUT2 protein in SOD1(G93A) ALS mice rescues motor neurons in the lumbar spinal cord and brainstem and preserves neuromuscular junctions in tibialis anterior, without altering disease onset or lifespan, establishing that VGLUT2-mediated glutamate release at motor neuron synapses contributes to excitotoxic degeneration in ALS.","method":"Genetic reduction of Vglut2 on SOD1(G93A) background, histological motor neuron counts, NMJ morphology, survival analysis","journal":"Neurobiology of Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in vivo with quantitative cellular phenotype, single lab","pmids":["19770042"],"is_preprint":false},{"year":2003,"finding":"VGLUT2 co-localizes with VGLUT1 in the same synaptic vesicles in young hippocampal mossy fibers, demonstrating that co-expressing neurons do not sort the two transporters into separate vesicle pools at early developmental stages.","method":"Immunofluorescence, confocal microscopy, and immunoisolation of synaptic vesicles showing co-fractionation of VGLUT1 and VGLUT2","journal":"Journal of Neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular fractionation and confocal co-localization, single lab","pmids":["16942593"],"is_preprint":false},{"year":2005,"finding":"VGLUT2 expression in hypothalamic-neurohypophysial vasopressin (and some oxytocin) magnocellular neurons is up-regulated by osmotic challenge (water deprivation or salt loading), and VGLUT2 immunoreactivity in vasopressin terminals of the neurohypophysis is reduced after stimulation, suggesting regulated vesicular glutamate co-release in response to osmotic stress.","method":"In situ hybridization for VGLUT2 mRNA, immunohistochemistry for VGLUT2 protein, double-label with vasopressin/oxytocin markers, osmotic challenge paradigms","journal":"The European Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — double-label ISH and IHC with two orthogonal methods; single lab","pmids":["16101749","16842872"],"is_preprint":false},{"year":2015,"finding":"Prenatal ethanol exposure upregulates Slc17a6 (VGLUT2) mRNA in male offspring hippocampus correlated with decreased DNA methylation and enrichment of active histone H3K4me3 at the Slc17a6 promoter. Despite mRNA upregulation, hippocampal VGLUT2 protein is decreased, due in part to miR-467b-5p, which was confirmed to interact with the 3'UTR of Slc17a6 in a reporter assay.","method":"ChIP for H3K4me3, bisulfite sequencing for DNA methylation, microRNA profiling, luciferase 3'UTR reporter assay, Western blot and qRT-PCR","journal":"Epigenetics & Chromatin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple epigenetic methods plus functional reporter assay validating miRNA-target interaction; single lab","pmids":["26421062"],"is_preprint":false},{"year":2020,"finding":"Deletion of VGLUT2 from midbrain DA neurons attenuates both dopamine and glutamate release in the nucleus accumbens induced by methamphetamine (measured by microdialysis) and reduces METH-induced locomotion, demonstrating that VGLUT2-mediated glutamate co-release from DA neurons contributes to METH-induced NAc glutamate increases.","method":"Conditional knockout (DAT-Cre/Vglut2-flox), in vivo brain microdialysis for DA and glutamate, locomotor behavioral assay","journal":"Pharmacology, Biochemistry, and Behavior","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with in vivo microdialysis; single lab","pmids":["33444596"],"is_preprint":false},{"year":2020,"finding":"VGLUT2-expressing neurons in the vestibular nuclear complex mediate hypergravity (2g)-induced hypothermia via sympathoinhibition: bilateral chemogenetic activation of VNC VGLUT2 neurons alone induces hypothermia, and their conditional deletion suppresses 2g-induced hypothermia, whereas VGAT-expressing VNC neuron manipulation does not affect this phenotype.","method":"Conditional deletion of VGLUT2 in VNC neurons, DREADD-based chemogenetic activation, plasma catecholamine measurement, brown adipose tissue thermography, behavioral assay under 2g load","journal":"Communications Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional manipulation (activation and deletion) with biochemical and physiological readouts, with selectivity established by parallel VGAT experiment","pmids":["32385401"],"is_preprint":false},{"year":2019,"finding":"Wnt1/β-catenin signaling upregulates spinal VGLUT2 protein after nerve injury. Blocking Wnt1 with a targeting antibody or inhibiting β-catenin with XAV939 reduces VGLUT2 levels and attenuates mechanical allodynia; pretreatment with VGLUT2 shRNA abolishes Wnt-agonist-induced allodynia, placing VGLUT2 downstream of Wnt1/β-catenin signaling in neuropathic pain.","method":"Intrathecal shRNA knockdown, Wnt agonist/antagonist pharmacology, Western blot for VGLUT2 and β-catenin pathway proteins, behavioral pain assays","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via shRNA rescue of agonist-induced phenotype plus pharmacological pathway blockade; single lab","pmids":["31785260"],"is_preprint":false},{"year":2017,"finding":"CB1 receptors on VgluT2-expressing glutamatergic neurons in the VTA mediate Δ9-THC-induced conditioned place aversion and reduction in optical intracranial self-stimulation: selective deletion of CB1Rs in VgluT2-expressing neurons (VgluT2-CB1-/-) abolishes THC-induced aversion but not reward, establishing that CB1R activation on glutamatergic (VGLUT2+) VTA neurons produces aversive effects.","method":"Cre-loxP selective CB1R deletion in VgluT2-Cre mice, optogenetic activation of VTA glutamatergic neurons, conditioned place aversion, intracranial self-stimulation, DA receptor antagonist pharmacology","journal":"Scientific Reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO combined with optogenetics and multiple behavioral paradigms with pharmacological validation","pmids":["28951549"],"is_preprint":false},{"year":2020,"finding":"Mu opioid receptors (MOR) on vGluT2-expressing neurons directly mediate inhibition of glutamate transmission: MORflox-vGluT2cre mice (lacking MORs selectively on vGluT2 neurons) fail to acquire conditioned place preference for low-dose oxycodone and display conditioned place aversion at higher dose; they also fail to show oxycodone-induced locomotion and consume less oxycodone, demonstrating that MOR-mediated regulation of VGLUT2-neuron glutamate release is critical for opioid reward.","method":"Conditional knockout of MOR in vGluT2-Cre neurons, conditioned place preference/aversion, oral consumption assay, locomotor assay","journal":"Addiction Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific KO with multiple behavioral endpoints; single lab","pmids":["32686251"],"is_preprint":false}],"current_model":"SLC17A6/VGLUT2 is a proton-gradient-driven vesicular glutamate transporter that loads glutamate into synaptic vesicles and synaptic-like microvesicles via H+/L-glutamate antiport; its synaptic targeting and endocytic recycling depend on a C-terminal dileucine-like motif that engages clathrin adaptor proteins AP-1, AP-2, and AP-3; in dopamine neurons it enables glutamate co-release that modulates mesoaccumbal synaptic plasticity, psychostimulant responses, neuroprotection, and post-lesional axonal reinnervation; in primary afferent nociceptors and spinal dorsal horn interneurons it is essential for heat nociception, thermal hyperalgesia, and itch suppression; its expression is regulated by neuronal activity via CaMK/ERK1/2 signaling, by osmotic stimuli in hypothalamic vasopressin neurons, by Wnt1/β-catenin signaling after nerve injury, and epigenetically by DNA methylation, H3K4me3, and miR-467b-5p at its promoter."},"narrative":{"mechanistic_narrative":"SLC17A6 (VGLUT2) is a proton-gradient-driven vesicular glutamate transporter that loads L-glutamate into synaptic vesicles and synaptic-like microvesicles, and its expression alone is sufficient to confer glutamatergic transmission on otherwise non-glutamatergic neurons [PMID:11698620, PMID:11551935]. Heterologous reconstitution established that transport occurs at the expense of a vacuolar H+-pump-generated electrochemical proton gradient and operates as an H+/L-glutamate antiporter, with an additional plasma-membrane efflux mode [PMID:11551935, PMID:18080752]. VGLUT2 marks a synaptic vesicle population largely distinct from the VGLUT1 pool in mature neurons, though the two transporters can co-reside on the same vesicles early in development [PMID:11698620, PMID:16942593]. Synaptic targeting and endocytic recycling depend on a C-terminal dileucine-like motif that binds the clathrin adaptors AP-1, AP-2, and AP-3; mutation of this motif abolishes synaptic localization and endocytosis [PMID:29123471]. In midbrain dopamine neurons VGLUT2 enables glutamate co-release that shapes mesoaccumbal synaptic plasticity and psychostimulant and reward behaviors, regulates dopamine release and clearance, and is a determinant of dopamine-neuron survival, axonal outgrowth, and post-lesional reinnervation [PMID:20018672, PMID:21880920, PMID:29337309, PMID:30210305, PMID:32928885]. In TRPV1/Nav1.8-lineage primary afferents and spinal dorsal horn interneurons, VGLUT2 is essential for thermal nociception and heat hyperalgesia and for suppression of itch [PMID:21040852, PMID:21135246, PMID:28157737, PMID:30203849]. VGLUT2 expression is dynamically regulated by neuronal activity through CaMK/ERK1/2 signaling [PMID:20212045], by Wnt1/β-catenin signaling after nerve injury [PMID:31785260], and epigenetically via DNA methylation, H3K4me3, and miR-467b-5p at its locus [PMID:26421062].","teleology":[{"year":2001,"claim":"Established that SLC17A6 is itself a functional vesicular glutamate transporter and not merely a marker, answering whether the protein could account for glutamate loading and glutamatergic transmission.","evidence":"Heterologous expression in BON and COS7 cells with ATP- and proton-gradient-dependent uptake assays, plus overexpression in GABAergic neurons driving AMPA-receptor currents, with EM/fractionation localizing it to synaptic-like microvesicles","pmids":["11698620","11551935"],"confidence":"High","gaps":["Transport stoichiometry and ion coupling not fully quantified","No structural model of the transporter"]},{"year":2003,"claim":"Defined how VGLUT2 partitions relative to VGLUT1, showing they mark non-overlapping vesicle pools in mature neurons but can co-reside on the same vesicles developmentally.","evidence":"Subcellular fractionation, synaptic-vesicle immunoisolation, and confocal co-localization in hippocampal preparations","pmids":["11698620","16942593"],"confidence":"Medium","gaps":["Mechanism of developmental vesicle sorting between VGLUT1 and VGLUT2 not defined","Single-lab fractionation evidence"]},{"year":2007,"claim":"Resolved the substrate specificity and transport modes, showing selective L-glutamate (not aspartate) handling consistent with H+/L-glutamate antiport plus an efflux mode.","evidence":"Xenopus oocyte radiolabeled influx/efflux assays with pharmacological inhibition (rose bengal, trypan blue)","pmids":["18080752"],"confidence":"Medium","gaps":["Single expression system, single lab","Physiological relevance of the plasma-membrane efflux mode unestablished"]},{"year":2009,"claim":"Demonstrated in vivo that VGLUT2-mediated glutamate co-release from dopamine neurons is required for psychostimulant-driven behavioral activation, moving the transporter from biochemistry into circuit function.","evidence":"DAT-Cre/Vglut2-flox conditional knockout with amperometry and amphetamine locomotor behavior","pmids":["20018672"],"confidence":"High","gaps":["Did not isolate which downstream synapses mediate the behavior","Developmental versus acute contribution not separated"]},{"year":2010,"claim":"Identified an essential role for VGLUT2 in primary afferent and spinal sensory circuits, establishing it as the dedicated mediator of heat nociception and heat hyperalgesia and a suppressor of itch.","evidence":"TRPV1-Cre and Nav1.8-Cre conditional knockouts with spinal in vivo electrophysiology, behavioral nociception/itch assays, injury models, and GRPR epistasis","pmids":["21040852","21135246"],"confidence":"High","gaps":["Why mechanical hypersensitivity is VGLUT2-independent unexplained","Molecular basis of the itch-suppression circuit incomplete"]},{"year":2010,"claim":"Showed that VGLUT2 expression is activity-regulated, linking glutamatergic drive to a defined Ca2+/CaMK/ERK transcriptional cascade.","evidence":"Pharmacological pathway dissection (iGluR, L-type Ca2+ channels, calmodulin, CaMK, ERK1/2) with transcription blockade and immunostaining in neocortical culture","pmids":["20212045"],"confidence":"Medium","gaps":["Transcription factors acting at the promoter not identified","In vivo relevance not tested"]},{"year":2017,"claim":"Defined the trafficking determinant, mapping synaptic targeting and recycling to a C-terminal dileucine-like motif that engages specific clathrin adaptors.","evidence":"pHluorin live imaging, motif mutagenesis, co-immunoprecipitation with AP-1/2/3, and adaptor shRNA knockdown in neurons","pmids":["29123471"],"confidence":"High","gaps":["Structural basis of adaptor selectivity unknown","Single lab; no reciprocal in vivo validation of adaptor requirement"]},{"year":2017,"claim":"Extended the sensory role to spinal interneurons, showing VGLUT2 underlies glutamatergic itch transmission in GRPR neurons and broadly drives dorsal-horn nociceptive output.","evidence":"Grpr-Cre and VGluT2-Cre conditional/chemogenetic manipulations with patch-clamp, calcium imaging, and behavioral pain/itch assays","pmids":["28157737","30203849"],"confidence":"High","gaps":["Connectivity between afferent and interneuronal VGLUT2 circuits not fully mapped"]},{"year":2018,"claim":"Established VGLUT2 expression level as a bidirectional determinant of dopamine-neuron vulnerability and a direct modulator of mesoaccumbal plasticity.","evidence":"Viral overexpression and conditional/inducible deletion in SNc/VTA DA neurons with neurotoxin challenge, optogenetics-coupled patch-clamp, and AMPA/NMDA ratio measurements","pmids":["29337309","30210305"],"confidence":"High","gaps":["Molecular mechanism linking VGLUT2 level to survival not defined","Whether glutamate co-release or transporter expression per se drives protection unresolved"]},{"year":2020,"claim":"Showed a developmental and regenerative role, with VGLUT2 promoting dopaminergic axonal outgrowth and striatal reinnervation after lesion.","evidence":"Intersectional fate-mapping, embryonic immunofluorescence, conditional knockout, and 6-OHDA lesion with axon density quantification","pmids":["32928885"],"confidence":"High","gaps":["Cell-autonomous signaling that couples VGLUT2 to axon growth not identified"]},{"year":2020,"claim":"Broadened the regulatory and circuit repertoire, implicating VGLUT2 neurons in opioid and cannabinoid reward/aversion and in autonomic/thermoregulatory control.","evidence":"Cell-type-specific receptor (MOR, CB1) deletions in VgluT2-Cre mice and chemogenetic VNC manipulations with behavioral, microdialysis, and physiological readouts","pmids":["32686251","28951549","32385401","33444596"],"confidence":"High","gaps":["Whether effects require glutamate transport activity versus neuronal identity not always dissociated"]},{"year":2021,"claim":"Defined upstream regulatory inputs controlling VGLUT2 levels in disease and injury contexts (Wnt1/β-catenin, epigenetic and miRNA control, neuroprotective upregulation).","evidence":"Intrathecal shRNA epistasis with Wnt pharmacology, ChIP/bisulfite/3'UTR-reporter analyses, and correlational neuroanatomy in rotenone and ALS models","pmids":["31785260","26421062","33893220","19770042"],"confidence":"Medium","gaps":["Causal manipulation of VGLUT2 absent in the rotenone study","Integration of activity-, Wnt-, and epigenetic regulation into a single regulatory model lacking"]},{"year":null,"claim":"How VGLUT2 transporter structure underlies ion coupling, substrate selectivity, and the molecular logic by which the dileucine motif selects among AP adaptors remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the transporter","Adaptor-selectivity determinants undefined","No human Mendelian disease link established in this corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,2,11,20]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,5,6,9]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,1,3]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[11]}],"complexes":[],"partners":["AP1","AP2","AP3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9P2U8","full_name":"Vesicular glutamate transporter 2","aliases":["Differentiation-associated BNPI","Differentiation-associated Na(+)-dependent inorganic phosphate cotransporter","Solute carrier family 17 member 6"],"length_aa":582,"mass_kda":64.4,"function":"Multifunctional transporter that transports L-glutamate as well as multiple ions such as chloride, proton, potassium, sodium and phosphate (PubMed:11698620, PubMed:33440152). At the synaptic vesicle membrane, mainly functions as a uniporter which transports preferentially L-glutamate but also, phosphate from the cytoplasm into synaptic vesicles at presynaptic nerve terminals of excitatory neural cells (PubMed:11698620). The L-glutamate or phosphate uniporter activity is electrogenic and is driven by the proton electrochemical gradient, mainly by the electrical gradient established by the vacuolar H(+)-ATPase across the synaptic vesicle membrane (PubMed:11698620). In addition, functions as a chloride channel that allows the chloride permeation through the synaptic vesicle membrane therefore affects the proton electrochemical gradient and promotes synaptic vesicles acidification (By similarity). Moreover, functions as a vesicular K(+)/H(+) antiport allowing to maintain the electrical gradient and to decrease chemical gradient and therefore sustain vesicular glutamate uptake (By similarity). The vesicular H(+)/H(+) antiport activity is electroneutral (By similarity). At the plasma membrane, following exocytosis, functions as a symporter of Na(+) and phosphate from the extracellular space to the cytoplasm allowing synaptic phosphate homeostasis regulation (Probable) (PubMed:10820226). The symporter activity is driven by an inside negative membrane potential and is electrogenic (Probable). Also involved in the regulation of retinal hyaloid vessel regression during postnatal development (By similarity). May also play a role in the endocrine glutamatergic system of other tissues such as pineal gland and pancreas (By similarity)","subcellular_location":"Cytoplasmic vesicle, secretory vesicle, synaptic vesicle membrane; Synapse, synaptosome; Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9P2U8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLC17A6","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SLC17A6","total_profiled":1310},"omim":[{"mim_id":"607563","title":"SOLUTE CARRIER FAMILY 17 (VESICULAR GLUTAMATE COTRANSPORTER), MEMBER 6; SLC17A6","url":"https://www.omim.org/entry/607563"},{"mim_id":"607557","title":"SOLUTE CARRIER FAMILY 17 (VESICULAR GLUTAMATE COTRANSPORTER), MEMBER 8; SLC17A8","url":"https://www.omim.org/entry/607557"},{"mim_id":"605208","title":"SOLUTE CARRIER FAMILY 17 (VESICULAR GLUTAMATE COTRANSPORTER), MEMBER 7; SLC17A7","url":"https://www.omim.org/entry/605208"},{"mim_id":"188890","title":"TOBACCO ADDICTION, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/188890"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":15.6},{"tissue":"pituitary gland","ntpm":3.5},{"tissue":"retina","ntpm":7.3}],"url":"https://www.proteinatlas.org/search/SLC17A6"},"hgnc":{"alias_symbol":["DNPI","VGLUT2"],"prev_symbol":[]},"alphafold":{"accession":"Q9P2U8","domains":[{"cath_id":"1.20.1250.20","chopping":"65-299","consensus_level":"medium","plddt":87.6649,"start":65,"end":299},{"cath_id":"1.20.1250.20","chopping":"303-505","consensus_level":"medium","plddt":91.4598,"start":303,"end":505}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P2U8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P2U8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P2U8-F1-predicted_aligned_error_v6.png","plddt_mean":78.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLC17A6","jax_strain_url":"https://www.jax.org/strain/search?query=SLC17A6"},"sequence":{"accession":"Q9P2U8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9P2U8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9P2U8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P2U8"}},"corpus_meta":[{"pmid":"11072093","id":"PMC_11072093","title":"Regional expression of a gene encoding a neuron-specific Na(+)-dependent inorganic phosphate cotransporter (DNPI) in the rat forebrain.","date":"2000","source":"Brain research. 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transmission.\",\n      \"method\": \"Heterologous expression in BON cells (ATP-dependent uptake assay), overexpression in autaptic GABAergic neurons with electrophysiology (bicuculline-insensitive, NBQX-sensitive postsynaptic currents)\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of transport activity plus functional electrophysiological readout in neurons, replicated across two independent assay systems in one study\",\n      \"pmids\": [\"11698620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"DNPI/VGLUT2, when expressed in COS7 cells, transports L-glutamate at the expense of an electrochemical proton gradient established by the vacuolar proton pump, confirming it as a bona fide vesicular glutamate transporter. It is present on synaptic-like microvesicles (SLMVs) in pinealocytes and pancreatic alpha cells and is responsible for vesicular glutamate storage in these endocrine cells.\",\n      \"method\": \"Heterologous expression in COS7 cells (proton-gradient-dependent glutamate uptake assay), immunoelectron microscopy and subcellular fractionation showing co-fractionation with SLMVs\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted transport activity in heterologous cells confirmed by EM/fractionation, two orthogonal methods\",\n      \"pmids\": [\"11551935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"VGLUT2 is highly enriched in synaptic vesicles and resides on a vesicle population distinct from those containing VGAT or VGLUT1, showing that VGLUT1 and VGLUT2 mark non-overlapping vesicle populations.\",\n      \"method\": \"Subcellular fractionation, immunoisolation of synaptic vesicles, co-immunolocalization\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular fractionation and immunoisolation in a single study; consistent with reconstitution data in same paper\",\n      \"pmids\": [\"11698620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"VGLUT2 expressed in Xenopus oocytes mediates two independent transport modes: (1) uptake of L-glutamate (but not D-aspartate) into intracellular organelles in digitonin-permeabilized oocytes, and (2) efflux of L-glutamate (but not L-aspartate) from intact oocytes, consistent with H+/L-glutamate antiport and a potential plasma-membrane leakage mode. Transport was blocked by rose bengal and trypan blue.\",\n      \"method\": \"Heterologous expression in Xenopus oocytes, radiolabeled glutamate influx and efflux assays, pharmacological inhibition\",\n      \"journal\": \"Neurochemical Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous in vitro functional assay but single lab, single expression system\",\n      \"pmids\": [\"18080752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Conditional deletion of VGLUT2 in dopamine neurons (DAT-Cre/Vglut2-lox mice) does not affect basal motor function but greatly blunts locomotor response to amphetamine and alters risk-taking behavior, demonstrating that VGLUT2 expression in DA neurons is required for psychostimulant-induced behavioral activation.\",\n      \"method\": \"Conditional knockout (DAT-Cre/Vglut2-flox), in vivo amperometry, behavioral assays (open-field, amphetamine locomotion)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with multiple behavioral paradigms and neurochemical readout\",\n      \"pmids\": [\"20018672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Conditional deletion of VGLUT2 in TRPV1-lineage primary afferents causes dramatic increase in itch behavior and reduced responsiveness to thermal pain, establishing that VGLUT2 in these nociceptors is required for thermal nociception and suppression of itch.\",\n      \"method\": \"Conditional knockout (TRPV1-Cre/Vglut2-flox), behavioral assays (thermal pain, mechanical pain, itch), pharmacological rescue with antihistamines and GRPR-KO epistasis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO, multiple behavioral phenotypes, genetic epistasis with GRPR\",\n      \"pmids\": [\"21040852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Conditional knockout of Slc17a6 (VGLUT2) from the majority of DRG nociceptors profoundly decreases VGLUT2 protein, reduces lamina I spinal cord neuron firing to noxious heat and mechanical stimuli, and impairs acute noxious heat, mechanical, and capsaicin responses. Heat hyperalgesia after tissue or nerve injury is lost, but mechanical hypersensitivity is intact, revealing a VGLUT2-dependent mechanism specifically for heat pain.\",\n      \"method\": \"Conditional knockout (Nav1.8-Cre/Vglut2-flox), in vivo electrophysiology of spinal neurons, behavioral nociceptive assays, nerve injury models\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with in vivo electrophysiology and multiple behavioral paradigms across two independent injury models\",\n      \"pmids\": [\"21135246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Activity-dependent induction of VGLUT2 mRNA and synaptic protein in mature neocortical neurons is triggered by prolonged increase in glutamatergic activity and requires signaling through ionotropic glutamate receptors, L-type voltage-gated Ca2+ channels, calmodulin, CaMK, and ERK1/2. Induced VGLUT2 protein appears on synaptic vesicles at excitatory synapses onto GABAergic interneurons.\",\n      \"method\": \"Pharmacological blockade of activity, calcium signaling inhibitors, actinomycin D transcription blockade, Western blot, immunofluorescence in neocortical culture\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological inhibitors targeting distinct pathway nodes, single lab\",\n      \"pmids\": [\"20212045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Conditional deletion of Vglut2 in DA neurons (DAT-Cre/Vglut2-flox) enhances operant self-administration of sucrose and intravenous cocaine and increases cocaine seeking maintained by drug-paired cues by 76%; it also reduces potassium-evoked DA release in striatum and increases DA receptor binding, indicating that VGLUT2-mediated glutamate co-release from DA neurons regulates reward-dependent plasticity.\",\n      \"method\": \"Conditional knockout (DAT-Cre/Vglut2-flox), operant self-administration, in vivo DA chronoamperometry, DA receptor autoradiography, immediate-early gene in situ hybridization\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple orthogonal neurochemical and behavioral methods\",\n      \"pmids\": [\"21880920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Conditional deletion of VGLUT2 throughout development using Emx1-Cre reduces evoked glutamate transmission, release probability, and LTD at hippocampal CA3-CA1 synapses during postnatal days 11-14. In adults, it causes reduced dendritic arbor and spine density of CA1 pyramidal neurons, impaired LTP, and spatial learning/memory deficits that are partially rescued by enhancing NMDA receptor-mediated transmission with D-serine.\",\n      \"method\": \"Conditional knockout (Emx1-Cre/Vglut2-flox), whole-cell patch-clamp electrophysiology, Golgi staining for dendritic morphology, behavioral spatial memory tests, pharmacological NMDAR enhancement\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with electrophysiology, morphology, and behavior; pharmacological rescue provides pathway placement\",\n      \"pmids\": [\"23136427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Conditional reduction of Vglut2 in a Pitx2-co-expressing subpopulation of subthalamic nucleus neurons reduces glutamatergic transmission to substantia nigra pars reticulata and entopeduncular nucleus, causes hyperlocomotion and decreased movement initiation latency, and reduces dopamine transporter binding with slower dopamine clearance in vivo, demonstrating that VGLUT2-expressing STN neurons regulate both motor output and dopaminergic transmission.\",\n      \"method\": \"Conditional knockout (Pitx2-Cre subpopulation targeting/Vglut2-flox), electrophysiology in STN targets, behavioral locomotion assays, DAT binding assay, in vivo voltammetry\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with neurochemical and behavioral phenotyping plus in vivo dopamine measurement\",\n      \"pmids\": [\"24821804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VGLUT2 trafficking to synaptic vesicles depends on a C-terminal dileucine-like motif; disruption of this motif abolishes synaptic targeting and essentially eliminates endocytosis. VGLUT2 interacts biochemically with clathrin adaptor proteins AP-1, AP-2, and AP-3 at this motif. VGLUT2 recycling is slower than VGLUT1 and relies on AP-1 and AP-3 (not just AP-2), as shown by shRNA knockdown of individual adaptors.\",\n      \"method\": \"pHluorin-reporter live imaging, site-directed mutagenesis of dileucine-like motif, co-immunoprecipitation with AP-1/2/3, shRNA knockdown of adaptors in hippocampal and thalamic neurons\",\n      \"journal\": \"Frontiers in Cellular Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis + biochemical interaction + live-imaging in neurons, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"29123471\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Overexpression of VGLUT2 specifically in murine SNc DA neurons causes neuronal loss and Parkinsonian behaviors; conditional deletion of VGLUT2 from DA neurons increases their susceptibility to Parkinsonian neurotoxins. These opposing effects establish VGLUT2 expression level as a crucial determinant of DA neuron survival and selective vulnerability.\",\n      \"method\": \"Viral-vector VGLUT2 overexpression in SNc, conditional knockout (DA neuron-specific), neurotoxin challenge, behavioral Parkinsonism assays, histological DA neuron counts\",\n      \"journal\": \"The Journal of Clinical Investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional genetic manipulation (OE and KO) with consistent phenotypic outcomes across multiple paradigms\",\n      \"pmids\": [\"29337309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Tamoxifen-inducible conditional deletion of Vglut2 in mature DA neurons reduces glutamatergic transmission from DA axons to nucleus accumbens medium spiny neurons (optogenetics-coupled patch clamp), and increases the baseline AMPA/NMDA ratio in DRD1-expressing MSNs, occluding subsequent cocaine-induced synaptic potentiation. This identifies VGLUT2-mediated glutamate co-release as a direct modulator of synaptic plasticity in the mesoaccumbal circuit.\",\n      \"method\": \"Tamoxifen-inducible Cre-LoxP (adult-stage deletion), optogenetics-coupled patch-clamp in nucleus accumbens, AMPA/NMDA ratio measurements\",\n      \"journal\": \"Frontiers in Neural Circuits\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — optogenetics-coupled electrophysiology directly measures co-release; inducible adult-stage KO isolates developmental confounds; single lab with multiple electrophysiological endpoints\",\n      \"pmids\": [\"30210305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Spinal cord interneurons expressing GRPR use VGLUT2-mediated signaling to transmit itch: conditional deletion of Vglut2 in Grpr-Cre cells (Vglut2-lox;Grpr-Cre mice) reduces spontaneous itch and attenuated responses to both histaminergic and nonhistaminergic pruritogens. Gastrin-releasing peptide induces spike responses and natriuretic polypeptide B induces calcium influx in this population.\",\n      \"method\": \"Conditional knockout (Grpr-Cre/Vglut2-lox), behavioral itch assays, patch-clamp electrophysiology, calcium imaging\",\n      \"journal\": \"Pain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with multiple behavioral and electrophysiological readouts\",\n      \"pmids\": [\"28157737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"VGluT2-expressing excitatory neurons in spinal dorsal horn lamina II are required for nociceptive transmission: chemogenetic activation of hM3D-DREADD in VGluT2-Cre neurons increases neuronal firing and synaptic glutamate release, whereas inhibitory KORD activation reduces them. Chemogenetic silencing reverses inflammatory and neuropathic pain hypersensitivity.\",\n      \"method\": \"Chemogenetic (DREADD) activation and inhibition via AAV-Cre-dependent vectors in VGluT2-Cre mice, patch-clamp recording of dorsal horn neurons, behavioral pain assays\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional chemogenetic manipulation with electrophysiological and behavioral readouts\",\n      \"pmids\": [\"30203849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Dopamine neurons in postnatal rat mesencephalic cultures express VGLUT2 (but not VGLUT1 or VGLUT3), as confirmed by single-cell RT-PCR, providing the molecular basis for glutamate co-release by DA neurons. Only a proportion of terminals from individual DA neurons are VGLUT2-positive, indicating heterogeneous axonal phenotype.\",\n      \"method\": \"Immunocytochemistry, single-cell RT-PCR in isolated DA neurons\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-cell RT-PCR confirms immunostaining at transcript level; single lab\",\n      \"pmids\": [\"15009640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"VGluT2 expression in DA neurons promotes axonal outgrowth and striatal reinnervation after neurotoxin lesion: >98% of DA neurons have a VGluT2+ developmental lineage (intersectional fate-mapping), VGluT2 is detected in developing DA axons at E11.5, and conditional removal of VGluT2 from DA neurons reduces striatal connections 7 weeks post-lesion.\",\n      \"method\": \"Intersectional genetic lineage mapping, embryonic immunofluorescence, conditional knockout (DA-Cre/Vglut2-flox), 6-OHDA lesion model, axon density quantification\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — lineage mapping + KO + lesion model with multiple orthogonal approaches in one study\",\n      \"pmids\": [\"32928885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In the rotenone rat model of Parkinson's disease, VGLUT2-expressing DA neurons are more resilient to neurodegeneration than VGLUT2-negative neurons; rotenone also increases the density of VGLUT2-detectable DA neurons in VTA and SNc, suggesting upregulation of VGLUT2 as part of a neuroprotective response.\",\n      \"method\": \"Rotenone rat model, immunofluorescence double-labeling for TH/VGLUT2, stereological neuron counting, analysis of striatal terminal density\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — correlational neuroanatomical analysis in a lesion model, no direct manipulation of VGLUT2 in this study; consistent with other KO data\",\n      \"pmids\": [\"33893220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Genetic reduction of VGLUT2 protein in SOD1(G93A) ALS mice rescues motor neurons in the lumbar spinal cord and brainstem and preserves neuromuscular junctions in tibialis anterior, without altering disease onset or lifespan, establishing that VGLUT2-mediated glutamate release at motor neuron synapses contributes to excitotoxic degeneration in ALS.\",\n      \"method\": \"Genetic reduction of Vglut2 on SOD1(G93A) background, histological motor neuron counts, NMJ morphology, survival analysis\",\n      \"journal\": \"Neurobiology of Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in vivo with quantitative cellular phenotype, single lab\",\n      \"pmids\": [\"19770042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"VGLUT2 co-localizes with VGLUT1 in the same synaptic vesicles in young hippocampal mossy fibers, demonstrating that co-expressing neurons do not sort the two transporters into separate vesicle pools at early developmental stages.\",\n      \"method\": \"Immunofluorescence, confocal microscopy, and immunoisolation of synaptic vesicles showing co-fractionation of VGLUT1 and VGLUT2\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular fractionation and confocal co-localization, single lab\",\n      \"pmids\": [\"16942593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"VGLUT2 expression in hypothalamic-neurohypophysial vasopressin (and some oxytocin) magnocellular neurons is up-regulated by osmotic challenge (water deprivation or salt loading), and VGLUT2 immunoreactivity in vasopressin terminals of the neurohypophysis is reduced after stimulation, suggesting regulated vesicular glutamate co-release in response to osmotic stress.\",\n      \"method\": \"In situ hybridization for VGLUT2 mRNA, immunohistochemistry for VGLUT2 protein, double-label with vasopressin/oxytocin markers, osmotic challenge paradigms\",\n      \"journal\": \"The European Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — double-label ISH and IHC with two orthogonal methods; single lab\",\n      \"pmids\": [\"16101749\", \"16842872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Prenatal ethanol exposure upregulates Slc17a6 (VGLUT2) mRNA in male offspring hippocampus correlated with decreased DNA methylation and enrichment of active histone H3K4me3 at the Slc17a6 promoter. Despite mRNA upregulation, hippocampal VGLUT2 protein is decreased, due in part to miR-467b-5p, which was confirmed to interact with the 3'UTR of Slc17a6 in a reporter assay.\",\n      \"method\": \"ChIP for H3K4me3, bisulfite sequencing for DNA methylation, microRNA profiling, luciferase 3'UTR reporter assay, Western blot and qRT-PCR\",\n      \"journal\": \"Epigenetics & Chromatin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple epigenetic methods plus functional reporter assay validating miRNA-target interaction; single lab\",\n      \"pmids\": [\"26421062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Deletion of VGLUT2 from midbrain DA neurons attenuates both dopamine and glutamate release in the nucleus accumbens induced by methamphetamine (measured by microdialysis) and reduces METH-induced locomotion, demonstrating that VGLUT2-mediated glutamate co-release from DA neurons contributes to METH-induced NAc glutamate increases.\",\n      \"method\": \"Conditional knockout (DAT-Cre/Vglut2-flox), in vivo brain microdialysis for DA and glutamate, locomotor behavioral assay\",\n      \"journal\": \"Pharmacology, Biochemistry, and Behavior\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with in vivo microdialysis; single lab\",\n      \"pmids\": [\"33444596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"VGLUT2-expressing neurons in the vestibular nuclear complex mediate hypergravity (2g)-induced hypothermia via sympathoinhibition: bilateral chemogenetic activation of VNC VGLUT2 neurons alone induces hypothermia, and their conditional deletion suppresses 2g-induced hypothermia, whereas VGAT-expressing VNC neuron manipulation does not affect this phenotype.\",\n      \"method\": \"Conditional deletion of VGLUT2 in VNC neurons, DREADD-based chemogenetic activation, plasma catecholamine measurement, brown adipose tissue thermography, behavioral assay under 2g load\",\n      \"journal\": \"Communications Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional manipulation (activation and deletion) with biochemical and physiological readouts, with selectivity established by parallel VGAT experiment\",\n      \"pmids\": [\"32385401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Wnt1/β-catenin signaling upregulates spinal VGLUT2 protein after nerve injury. Blocking Wnt1 with a targeting antibody or inhibiting β-catenin with XAV939 reduces VGLUT2 levels and attenuates mechanical allodynia; pretreatment with VGLUT2 shRNA abolishes Wnt-agonist-induced allodynia, placing VGLUT2 downstream of Wnt1/β-catenin signaling in neuropathic pain.\",\n      \"method\": \"Intrathecal shRNA knockdown, Wnt agonist/antagonist pharmacology, Western blot for VGLUT2 and β-catenin pathway proteins, behavioral pain assays\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via shRNA rescue of agonist-induced phenotype plus pharmacological pathway blockade; single lab\",\n      \"pmids\": [\"31785260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CB1 receptors on VgluT2-expressing glutamatergic neurons in the VTA mediate Δ9-THC-induced conditioned place aversion and reduction in optical intracranial self-stimulation: selective deletion of CB1Rs in VgluT2-expressing neurons (VgluT2-CB1-/-) abolishes THC-induced aversion but not reward, establishing that CB1R activation on glutamatergic (VGLUT2+) VTA neurons produces aversive effects.\",\n      \"method\": \"Cre-loxP selective CB1R deletion in VgluT2-Cre mice, optogenetic activation of VTA glutamatergic neurons, conditioned place aversion, intracranial self-stimulation, DA receptor antagonist pharmacology\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO combined with optogenetics and multiple behavioral paradigms with pharmacological validation\",\n      \"pmids\": [\"28951549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Mu opioid receptors (MOR) on vGluT2-expressing neurons directly mediate inhibition of glutamate transmission: MORflox-vGluT2cre mice (lacking MORs selectively on vGluT2 neurons) fail to acquire conditioned place preference for low-dose oxycodone and display conditioned place aversion at higher dose; they also fail to show oxycodone-induced locomotion and consume less oxycodone, demonstrating that MOR-mediated regulation of VGLUT2-neuron glutamate release is critical for opioid reward.\",\n      \"method\": \"Conditional knockout of MOR in vGluT2-Cre neurons, conditioned place preference/aversion, oral consumption assay, locomotor assay\",\n      \"journal\": \"Addiction Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific KO with multiple behavioral endpoints; single lab\",\n      \"pmids\": [\"32686251\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLC17A6/VGLUT2 is a proton-gradient-driven vesicular glutamate transporter that loads glutamate into synaptic vesicles and synaptic-like microvesicles via H+/L-glutamate antiport; its synaptic targeting and endocytic recycling depend on a C-terminal dileucine-like motif that engages clathrin adaptor proteins AP-1, AP-2, and AP-3; in dopamine neurons it enables glutamate co-release that modulates mesoaccumbal synaptic plasticity, psychostimulant responses, neuroprotection, and post-lesional axonal reinnervation; in primary afferent nociceptors and spinal dorsal horn interneurons it is essential for heat nociception, thermal hyperalgesia, and itch suppression; its expression is regulated by neuronal activity via CaMK/ERK1/2 signaling, by osmotic stimuli in hypothalamic vasopressin neurons, by Wnt1/β-catenin signaling after nerve injury, and epigenetically by DNA methylation, H3K4me3, and miR-467b-5p at its promoter.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SLC17A6 (VGLUT2) is a proton-gradient-driven vesicular glutamate transporter that loads L-glutamate into synaptic vesicles and synaptic-like microvesicles, and its expression alone is sufficient to confer glutamatergic transmission on otherwise non-glutamatergic neurons [#0, #1]. Heterologous reconstitution established that transport occurs at the expense of a vacuolar H+-pump-generated electrochemical proton gradient and operates as an H+/L-glutamate antiporter, with an additional plasma-membrane efflux mode [#1, #3]. VGLUT2 marks a synaptic vesicle population largely distinct from the VGLUT1 pool in mature neurons, though the two transporters can co-reside on the same vesicles early in development [#2, #20]. Synaptic targeting and endocytic recycling depend on a C-terminal dileucine-like motif that binds the clathrin adaptors AP-1, AP-2, and AP-3; mutation of this motif abolishes synaptic localization and endocytosis [#11]. In midbrain dopamine neurons VGLUT2 enables glutamate co-release that shapes mesoaccumbal synaptic plasticity and psychostimulant and reward behaviors, regulates dopamine release and clearance, and is a determinant of dopamine-neuron survival, axonal outgrowth, and post-lesional reinnervation [#4, #8, #12, #13, #17]. In TRPV1/Nav1.8-lineage primary afferents and spinal dorsal horn interneurons, VGLUT2 is essential for thermal nociception and heat hyperalgesia and for suppression of itch [#5, #6, #14, #15]. VGLUT2 expression is dynamically regulated by neuronal activity through CaMK/ERK1/2 signaling [#7], by Wnt1/\\u03b2-catenin signaling after nerve injury [#25], and epigenetically via DNA methylation, H3K4me3, and miR-467b-5p at its locus [#22].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that SLC17A6 is itself a functional vesicular glutamate transporter and not merely a marker, answering whether the protein could account for glutamate loading and glutamatergic transmission.\",\n      \"evidence\": \"Heterologous expression in BON and COS7 cells with ATP- and proton-gradient-dependent uptake assays, plus overexpression in GABAergic neurons driving AMPA-receptor currents, with EM/fractionation localizing it to synaptic-like microvesicles\",\n      \"pmids\": [\"11698620\", \"11551935\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transport stoichiometry and ion coupling not fully quantified\", \"No structural model of the transporter\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined how VGLUT2 partitions relative to VGLUT1, showing they mark non-overlapping vesicle pools in mature neurons but can co-reside on the same vesicles developmentally.\",\n      \"evidence\": \"Subcellular fractionation, synaptic-vesicle immunoisolation, and confocal co-localization in hippocampal preparations\",\n      \"pmids\": [\"11698620\", \"16942593\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of developmental vesicle sorting between VGLUT1 and VGLUT2 not defined\", \"Single-lab fractionation evidence\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the substrate specificity and transport modes, showing selective L-glutamate (not aspartate) handling consistent with H+/L-glutamate antiport plus an efflux mode.\",\n      \"evidence\": \"Xenopus oocyte radiolabeled influx/efflux assays with pharmacological inhibition (rose bengal, trypan blue)\",\n      \"pmids\": [\"18080752\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single expression system, single lab\", \"Physiological relevance of the plasma-membrane efflux mode unestablished\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated in vivo that VGLUT2-mediated glutamate co-release from dopamine neurons is required for psychostimulant-driven behavioral activation, moving the transporter from biochemistry into circuit function.\",\n      \"evidence\": \"DAT-Cre/Vglut2-flox conditional knockout with amperometry and amphetamine locomotor behavior\",\n      \"pmids\": [\"20018672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not isolate which downstream synapses mediate the behavior\", \"Developmental versus acute contribution not separated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified an essential role for VGLUT2 in primary afferent and spinal sensory circuits, establishing it as the dedicated mediator of heat nociception and heat hyperalgesia and a suppressor of itch.\",\n      \"evidence\": \"TRPV1-Cre and Nav1.8-Cre conditional knockouts with spinal in vivo electrophysiology, behavioral nociception/itch assays, injury models, and GRPR epistasis\",\n      \"pmids\": [\"21040852\", \"21135246\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why mechanical hypersensitivity is VGLUT2-independent unexplained\", \"Molecular basis of the itch-suppression circuit incomplete\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed that VGLUT2 expression is activity-regulated, linking glutamatergic drive to a defined Ca2+/CaMK/ERK transcriptional cascade.\",\n      \"evidence\": \"Pharmacological pathway dissection (iGluR, L-type Ca2+ channels, calmodulin, CaMK, ERK1/2) with transcription blockade and immunostaining in neocortical culture\",\n      \"pmids\": [\"20212045\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcription factors acting at the promoter not identified\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the trafficking determinant, mapping synaptic targeting and recycling to a C-terminal dileucine-like motif that engages specific clathrin adaptors.\",\n      \"evidence\": \"pHluorin live imaging, motif mutagenesis, co-immunoprecipitation with AP-1/2/3, and adaptor shRNA knockdown in neurons\",\n      \"pmids\": [\"29123471\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of adaptor selectivity unknown\", \"Single lab; no reciprocal in vivo validation of adaptor requirement\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended the sensory role to spinal interneurons, showing VGLUT2 underlies glutamatergic itch transmission in GRPR neurons and broadly drives dorsal-horn nociceptive output.\",\n      \"evidence\": \"Grpr-Cre and VGluT2-Cre conditional/chemogenetic manipulations with patch-clamp, calcium imaging, and behavioral pain/itch assays\",\n      \"pmids\": [\"28157737\", \"30203849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Connectivity between afferent and interneuronal VGLUT2 circuits not fully mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established VGLUT2 expression level as a bidirectional determinant of dopamine-neuron vulnerability and a direct modulator of mesoaccumbal plasticity.\",\n      \"evidence\": \"Viral overexpression and conditional/inducible deletion in SNc/VTA DA neurons with neurotoxin challenge, optogenetics-coupled patch-clamp, and AMPA/NMDA ratio measurements\",\n      \"pmids\": [\"29337309\", \"30210305\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking VGLUT2 level to survival not defined\", \"Whether glutamate co-release or transporter expression per se drives protection unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed a developmental and regenerative role, with VGLUT2 promoting dopaminergic axonal outgrowth and striatal reinnervation after lesion.\",\n      \"evidence\": \"Intersectional fate-mapping, embryonic immunofluorescence, conditional knockout, and 6-OHDA lesion with axon density quantification\",\n      \"pmids\": [\"32928885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-autonomous signaling that couples VGLUT2 to axon growth not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Broadened the regulatory and circuit repertoire, implicating VGLUT2 neurons in opioid and cannabinoid reward/aversion and in autonomic/thermoregulatory control.\",\n      \"evidence\": \"Cell-type-specific receptor (MOR, CB1) deletions in VgluT2-Cre mice and chemogenetic VNC manipulations with behavioral, microdialysis, and physiological readouts\",\n      \"pmids\": [\"32686251\", \"28951549\", \"32385401\", \"33444596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether effects require glutamate transport activity versus neuronal identity not always dissociated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined upstream regulatory inputs controlling VGLUT2 levels in disease and injury contexts (Wnt1/\\u03b2-catenin, epigenetic and miRNA control, neuroprotective upregulation).\",\n      \"evidence\": \"Intrathecal shRNA epistasis with Wnt pharmacology, ChIP/bisulfite/3'UTR-reporter analyses, and correlational neuroanatomy in rotenone and ALS models\",\n      \"pmids\": [\"31785260\", \"26421062\", \"33893220\", \"19770042\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal manipulation of VGLUT2 absent in the rotenone study\", \"Integration of activity-, Wnt-, and epigenetic regulation into a single regulatory model lacking\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How VGLUT2 transporter structure underlies ion coupling, substrate selectivity, and the molecular logic by which the dileucine motif selects among AP adaptors remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the transporter\", \"Adaptor-selectivity determinants undefined\", \"No human Mendelian disease link established in this corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 2, 11, 20]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 5, 6, 9]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"AP1\", \"AP2\", \"AP3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}