{"gene":"NPRL3","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":2013,"finding":"NPRL3 (together with DEPDC5 and NPRL2) is a subunit of the GATOR1 complex, which has GTPase-activating protein (GAP) activity for RagA and RagB GTPases, thereby negatively regulating mTORC1 signaling. Inhibition of NPRL3 makes mTORC1 signaling resistant to amino acid deprivation, and cancer cells with inactivating GATOR1 mutations show mTOR hyperactivity and hypersensitivity to rapamycin.","method":"Affinity purification/mass spectrometry, RNAi knockdown, in vitro GAP activity assay, amino acid starvation experiments, epistasis analysis","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — biochemical reconstitution of GAP activity, multiple orthogonal methods, foundational paper with 884 citations","pmids":["23723238"],"is_preprint":false},{"year":2009,"finding":"Yeast Npr2 and Npr3 (orthologs of human NPRL2 and NPRL3) form a heterodimer and are required to inactivate TORC1 in response to amino acid starvation. The human homologs NPRL2 and NPRL3 also co-immunoprecipitate, indicating the heterodimer interaction is evolutionarily conserved.","method":"Genome-wide reverse genetic screen, biochemical purification, co-immunoprecipitation, TORC1 activity reporters","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP across species, genome-wide screen, replicated in human cells; 126 citations","pmids":["19521502"],"is_preprint":false},{"year":2011,"finding":"In yeast, the Iml1p-Npr2p-Npr3p complex (ortholog of mammalian GATOR1) is selectively required for non-nitrogen-starvation (NNS)-induced autophagy. The complex is required for autophagosome formation under NNS conditions, and Iml1p localizes to preautophagosomal structures (PAS). A conserved domain in Iml1p is required for both NNS-induced autophagy and complex formation.","method":"Visual screen, yeast deletion mutants, fluorescence microscopy, ultrastructural analysis (EM), domain mutagenesis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including EM and genetics, clear phenotypic readout; 78 citations","pmids":["21900499"],"is_preprint":false},{"year":2014,"finding":"In yeast, Npr2-Npr3 function upstream of Gtr1-Gtr2 (Rag GTPase orthologs). Npr2-Npr3 promote GTP hydrolysis on Gtr1 (converting it to GDP-bound state), which is required to inactivate TORC1 and induce autophagy. Loss of Npr2 or expression of constitutively GTP-bound Gtr1 both suppress autophagy and increase Tor1 vacuole localization. Mammalian NPRL2 and NPRL3 were also shown to regulate autophagy.","method":"Yeast genome-wide deletion screen, GTPase mutant analysis, TORC1 localization assay, autophagy flux assays in yeast and mammalian cells","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — epistasis using GTPase mutants, multiple readouts including TORC1 localization, confirmed in mammalian cells; 61 citations","pmids":["25046117"],"is_preprint":false},{"year":2014,"finding":"In Drosophila, Nprl2 and Nprl3 physically interact and co-localize to lysosomes and autolysosomes. They inhibit TORC1 signaling in the female germline in response to amino acid starvation, and work in concert with Tsc1/2 to fine-tune TORC1 activity. Failure to downregulate TORC1 in nprl2/nprl3 mutants during amino acid starvation triggers apoptosis in oogenesis.","method":"Co-immunoprecipitation, subcellular localization (immunofluorescence), genetic loss-of-function in Drosophila oogenesis, TORC1 activity assays, epistasis with Tsc1/2","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, subcellular localization with functional consequence, genetic epistasis in vivo; 45 citations","pmids":["24786828"],"is_preprint":false},{"year":2018,"finding":"Cryo-EM structures of the human GATOR1 complex and GATOR1-Rag GTPase complexes revealed that GATOR1 adopts an extended architecture where NPRL2 links DEPDC5 and NPRL3. The NPRL2-NPRL3 heterodimer executes GAP activity toward RAGA, while DEPDC5 contacts the Rag GTPase heterodimer and inhibits GAP activity when directly bound to RAGA. Thus at least two binding modes exist between Rag GTPases and GATOR1.","method":"Cryo-electron microscopy, biochemical GAP activity assays, mutagenesis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure plus in vitro biochemical validation of GAP activity, defines NPRL3 position in complex; 158 citations","pmids":["29590090"],"is_preprint":false},{"year":2016,"finding":"In fission yeast, loss of Npr2 or Npr3 (Nprl2/Nprl3 orthologs) disinhibits TORC1 activity under nitrogen depletion and diminishes vacuolar localization and protein levels of Gtr1 and Gtr2 (Rag GTPase orthologs). Lam2 (LAMTOR2 ortholog) physically interacts with Npr2 and Gtr1, and Lam2-Npr2-Npr3 function together to tether GDP-bound Gtr1 to the vacuolar membrane to suppress TORC1 activity.","method":"Yeast genetics, co-immunoprecipitation, subcellular localization imaging, TORC1 activity (Rps6 phosphorylation), genetic rescue experiments","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and localization with functional readout, single lab; 9 citations","pmids":["27227887"],"is_preprint":false},{"year":2015,"finding":"Mutations in NPRL3 cause familial focal epilepsy (including cases with focal cortical dysplasia). Immunostaining of resected brain tissue from patients with NPRL3 mutations demonstrated mTOR pathway hyperactivation (phospho-S6 immunoreactivity), linking loss-of-function NPRL3 mutations to mTORC1 dysregulation in human brain.","method":"Exome sequencing, linkage analysis, immunohistochemistry for mTOR activation markers in resected brain tissue","journal":"Annals of neurology","confidence":"Medium","confidence_rationale":"Tier 3 — human genetics plus IHC demonstrating mTOR hyperactivation in patient tissue; 108 citations","pmids":["26285051"],"is_preprint":false},{"year":2015,"finding":"NPRL3 mutations identified in focal epilepsy patients act through the mTOR-signaling pathway; NPRL3 is established as a focal epilepsy gene together with NPRL2 and DEPDC5 (all GATOR1 complex genes).","method":"Targeted capture next-generation sequencing, exome sequencing, linkage analysis of epilepsy families","journal":"Annals of neurology","confidence":"Medium","confidence_rationale":"Tier 3 — genetic identification in human cohort linking NPRL3 loss-of-function to mTOR dysregulation and epilepsy; 176 citations","pmids":["26505888"],"is_preprint":false},{"year":2022,"finding":"CRISPR/Cas9 knockout of Nprl3 in Neuro2a cells causes mTOR pathway hyperactivation (phospho-S6 and 4E-BP1), cell soma enlargement, and cellular aggregation. mTOR remains constitutively localized to the lysosome in an active conformation even under amino acid-free starvation, demonstrating that Nprl3 loss decouples mTOR activation from nutrient status. In vivo focal Nprl3 knockout in fetal mouse cortex (in utero electroporation) caused altered cortical lamination and white matter heterotopic neurons, both prevented by rapamycin treatment. EEG recordings showed network hyperexcitability and reduced seizure threshold.","method":"CRISPR/Cas9 knockout, immunofluorescence for mTOR localization, Western blot for mTOR substrates, time-lapse imaging, rapamycin rescue, in utero electroporation, EEG recordings","journal":"Brain","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including subcellular localization, nutrient signaling decoupling, in vivo cortical model, pharmacological rescue; 28 citations","pmids":["35136953"],"is_preprint":false},{"year":2021,"finding":"In Drosophila, Nprl3 protein stability is regulated by the FKBP39-dependent proteolytic destruction pathway and the Unassembled Soluble Complex Proteins Degradation (USPD) pathway. Under nutrient-replete conditions, FKBP39 promotes Nprl3 degradation to keep levels low; nutrient starvation abrogates this degradation, allowing rapid Nprl3 accumulation. Loss of fkbp39 decreases TORC1 activity and increases autophagy. Additionally, the 5'UTR of nprl3 transcripts contains a functional upstream open reading frame (uORF) that inhibits main ORF translation.","method":"Genetic loss-of-function (fkbp39 mutants), protein stability assays, TORC1 activity measurements, autophagy assays, uORF reporter assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — multiple genetic and biochemical methods establishing post-translational and translational regulation of Nprl3; 9 citations","pmids":["34078879"],"is_preprint":false},{"year":2021,"finding":"NPRL3 mediates the opposing functions of β-arrestin 1 (ARRB1) and β-arrestin 2 (ARRB2) in microglial inflammatory responses. RNA sequencing revealed that ARRB1 and ARRB2 differentially regulate Nprl3 expression, and gain/loss-of-function studies demonstrated that Nprl3 mediates ARRB effects on microglia inflammatory responses (STAT1 and NF-κB pathways) and Parkinson's disease pathology.","method":"RNA sequencing, gain/loss-of-function studies, primary microglia culture, in vivo PD mouse models, STAT1/NF-κB pathway assays","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 — RNA-seq combined with functional gain/loss-of-function, in vivo validation; 49 citations","pmids":["33686256"],"is_preprint":false},{"year":2022,"finding":"Conditional dorsal telencephalon-specific Nprl3 knockout mice (Emx1cre/+; Nprl3f/f) develop spontaneous seizures and dysmorphic enlarged neurons with increased mTORC1 signaling, similar to Depdc5-cKO mice. Chronic postnatal rapamycin administration prolonged survival and inhibited seizures but not enlarged neuronal cells. The benefit of rapamycin after withdrawal was less durable in Nprl3-cKO compared with Depdc5-cKO mice.","method":"Conditional knockout mice, EEG/seizure monitoring, rapamycin treatment, immunohistochemistry for mTORC1 signaling markers, comparative phenotype analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with defined molecular and cellular phenotypes, pharmacological rescue, comparative genetic analysis; 19 citations","pmids":["34965576"],"is_preprint":false},{"year":2021,"finding":"A loss-of-function NPRL3 mutation (c316C>T; p.Q106*) in familial focal epilepsy with variable foci leads to decreased NPRL3 mRNA and protein expression in peripheral blood cells, with consequent increased phospho-p70 S6 kinase (P-S6K), confirming that NPRL3 loss-of-function causes mTORC1 pathway hyperactivation.","method":"Whole exome sequencing, PCR, Western blotting, immunohistochemistry in peripheral blood cells from family members","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 3 — Western blot confirmation of downstream mTOR signaling in patient samples; moderate evidence from single study; 11 citations","pmids":["34868250"],"is_preprint":false},{"year":2017,"finding":"KICSTOR (including SZT2) recruits GATOR1 to the lysosomal surface and is required for GATOR1 to interact with its substrates the Rag GTPases; NPRL3 (as part of GATOR1) is thereby positioned at the lysosome to regulate mTORC1 in response to nutrient signals.","method":"Co-immunoprecipitation, subcellular localization, lysosomal fractionation, mTORC1 activity assays, mouse knockout","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, subcellular localization with functional consequence, in vivo mouse model; 270 citations","pmids":["28199306"],"is_preprint":false}],"current_model":"NPRL3 is a core subunit of the GATOR1 complex (together with DEPDC5 and NPRL2) that localizes to the lysosomal surface via KICSTOR-mediated recruitment, where the NPRL2-NPRL3 heterodimer executes GAP activity toward RagA/RagB GTPases to inhibit mTORC1 signaling in response to amino acid starvation; loss of NPRL3 locks mTOR in a constitutively active lysosomal conformation regardless of nutrient status, causing neuronal hypertrophy, cortical malformations, and epilepsy in humans and model organisms, all reversible by rapamycin."},"narrative":{"teleology":[{"year":2009,"claim":"Establishing that NPRL2 and NPRL3 orthologs form an evolutionarily conserved heterodimer required for TORC1 inactivation during amino acid starvation answered the question of how cells relay amino acid insufficiency upstream of TOR.","evidence":"Genome-wide reverse genetic screen in yeast combined with co-immunoprecipitation of human NPRL2–NPRL3","pmids":["19521502"],"confidence":"High","gaps":["Mechanism of TORC1 inhibition (direct GAP or indirect) was unknown","Whether a third subunit existed was not determined","Mammalian functional data limited to co-IP"]},{"year":2011,"claim":"Demonstrating that the yeast Iml1p–Npr2p–Npr3p complex is required for non-nitrogen-starvation autophagy linked NPRL3-containing complexes to autophagosome formation, expanding their role beyond TORC1 signaling per se.","evidence":"Fluorescence microscopy and EM of yeast deletion mutants under selective starvation conditions","pmids":["21900499"],"confidence":"High","gaps":["Whether the autophagy function is conserved in mammals was untested","Whether autophagy induction is a direct consequence of TORC1 inhibition or a parallel function was unclear"]},{"year":2013,"claim":"Biochemical reconstitution of GATOR1 as a trimeric complex (NPRL3–NPRL2–DEPDC5) with direct GAP activity toward RagA/RagB GTPases established the molecular mechanism by which NPRL3 suppresses mTORC1, and revealed that GATOR1-mutant cancer cells are hypersensitive to rapamycin.","evidence":"Affinity purification/mass spectrometry, in vitro GAP activity assay, RNAi, amino acid starvation in human cells","pmids":["23723238"],"confidence":"High","gaps":["Which subunit(s) catalyze GAP activity was not resolved","Structural basis of the complex was unknown","How GATOR1 is recruited to the lysosomal membrane was undefined"]},{"year":2014,"claim":"Genetic epistasis in yeast and Drosophila confirmed that NPRL2–NPRL3 act upstream of Rag GTPases to inactivate TORC1 and established in vivo physiological consequences of NPRL3 loss, including failed autophagy and apoptosis during starvation.","evidence":"Yeast GTPase mutant epistasis, Drosophila oogenesis genetic analysis, TORC1 localization and autophagy flux assays","pmids":["25046117","24786828"],"confidence":"High","gaps":["Mammalian in vivo phenotypes of NPRL3 loss were still uncharacterized","Whether NPRL3 has functions independent of Rag GAP activity was not addressed"]},{"year":2015,"claim":"Human genetic studies identified loss-of-function NPRL3 mutations as a cause of familial focal epilepsy, with patient brain tissue showing mTOR pathway hyperactivation, linking GATOR1 dysfunction to a Mendelian neurological disease.","evidence":"Exome sequencing and linkage analysis in epilepsy families, phospho-S6 immunohistochemistry on resected brain tissue","pmids":["26285051","26505888"],"confidence":"Medium","gaps":["Causal proof via rescue or functional reconstitution in human neurons was lacking","Genotype–phenotype correlations across GATOR1 genes were not established","Mechanism of cortical malformation was not elucidated"]},{"year":2017,"claim":"Discovery that KICSTOR recruits GATOR1 to the lysosomal surface resolved how NPRL3-containing complexes access their Rag GTPase substrates, explaining a key spatial prerequisite for mTORC1 regulation.","evidence":"Reciprocal co-immunoprecipitation, lysosomal fractionation, mTORC1 activity assays, SZT2 knockout mice","pmids":["28199306"],"confidence":"High","gaps":["Whether KICSTOR–GATOR1 interaction is regulated by nutrients was not fully resolved","Structural basis of the KICSTOR–GATOR1 interface was unknown"]},{"year":2018,"claim":"Cryo-EM structures of GATOR1 and GATOR1–Rag complexes revealed that NPRL2–NPRL3 heterodimer executes the catalytic GAP step toward RagA, while DEPDC5 contacts and inhibits Rag GTPases in a separate binding mode, resolving the long-standing question of subunit-specific roles.","evidence":"Cryo-electron microscopy at sub-nanometer resolution with mutagenesis-validated GAP activity assays","pmids":["29590090"],"confidence":"High","gaps":["Atomic details of the catalytic mechanism (arginine finger) were not fully resolved","Structural basis for GATOR2-mediated regulation of GATOR1 was not determined"]},{"year":2021,"claim":"Identification of post-translational and translational regulatory mechanisms for NPRL3 (FKBP39-dependent proteolysis, uORF-mediated translational repression) revealed that NPRL3 protein levels are dynamically tuned by nutrient status, adding a feed-forward layer to TORC1 control.","evidence":"Drosophila fkbp39 mutants, protein stability assays, uORF reporter assays, TORC1 and autophagy readouts","pmids":["34078879"],"confidence":"Medium","gaps":["Whether these regulatory mechanisms are conserved in mammals is unknown","Identity of the E3 ligase mediating NPRL3 degradation was not established"]},{"year":2022,"claim":"In vivo mouse models (focal and conditional cortex-wide Nprl3 knockout) demonstrated that NPRL3 loss decouples mTOR from nutrient sensing at the lysosome, causes cortical malformations and spontaneous epilepsy, and that rapamycin rescues lamination defects and seizures, providing direct causal proof for the NPRL3–mTORC1–epilepsy axis.","evidence":"CRISPR/Cas9 knockout in neuronal cells, in utero electroporation, conditional knockout mice, EEG monitoring, rapamycin rescue, mTOR lysosomal localization under starvation","pmids":["35136953","34965576"],"confidence":"High","gaps":["Why rapamycin benefit is less durable after withdrawal in Nprl3-cKO versus Depdc5-cKO is unexplained","Cell-type-specific requirements for NPRL3 in the brain are not resolved","Whether NPRL3 loss contributes to epileptogenesis through mTOR-independent mechanisms is untested"]},{"year":null,"claim":"A full atomic-resolution catalytic mechanism for NPRL2–NPRL3-mediated GAP activity, the structural basis of GATOR2-to-GATOR1 signal relay, and whether NPRL3 has mTORC1-independent functions in inflammation or other contexts remain open questions.","evidence":"","pmids":[],"confidence":"Low","gaps":["Catalytic residues and arginine finger for GAP activity not definitively identified","GATOR2–GATOR1 structural interface unresolved","NPRL3 role in microglial inflammation (ARRB1/ARRB2 axis) not independently replicated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,3,5]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,5]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[4,9,14]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,5,9]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[2,3,4]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[7,8,12]}],"complexes":["GATOR1"],"partners":["NPRL2","DEPDC5","RRAGA","RRAGB","SZT2","FKBP39"],"other_free_text":[]},"mechanistic_narrative":"NPRL3 is a core subunit of the GATOR1 complex that functions as a negative regulator of mTORC1 signaling by promoting GTP hydrolysis on RagA/RagB GTPases at the lysosomal surface in response to amino acid deprivation. Within GATOR1, the NPRL2–NPRL3 heterodimer executes the GAP catalytic activity toward RagA, while DEPDC5 serves as the Rag-contacting inhibitory module, and the entire complex is recruited to lysosomes by the KICSTOR scaffold [PMID:23723238, PMID:29590090, PMID:28199306]. Loss of NPRL3 locks mTORC1 in a constitutively active lysosomal conformation irrespective of nutrient status, causing neuronal hypertrophy, cortical lamination defects, and seizures that are reversible by rapamycin [PMID:35136953, PMID:34965576]. Germline loss-of-function mutations in NPRL3 cause familial focal epilepsy with variable foci, accompanied by mTOR pathway hyperactivation in patient brain tissue [PMID:26285051, PMID:26505888]."},"prefetch_data":{"uniprot":{"accession":"Q12980","full_name":"GATOR1 complex protein NPRL3","aliases":["-14 gene protein","Alpha-globin regulatory element-containing gene protein","Nitrogen permease regulator 3-like protein","Protein CGTHBA"],"length_aa":569,"mass_kda":63.6,"function":"As a component of the GATOR1 complex functions as an inhibitor of the amino acid-sensing branch of the mTORC1 pathway (PubMed:23723238, PubMed:29590090, PubMed:35338845). In response to amino acid depletion, the GATOR1 complex has GTPase activating protein (GAP) activity and strongly increases GTP hydrolysis by RagA/RRAGA (or RagB/RRAGB) within heterodimeric Rag complexes, thereby turning them into their inactive GDP-bound form, releasing mTORC1 from lysosomal surface and inhibiting mTORC1 signaling (PubMed:23723238, PubMed:29590090, PubMed:35338845). In the presence of abundant amino acids, the GATOR1 complex is negatively regulated by GATOR2, the other GATOR subcomplex, in this amino acid-sensing branch of the TORC1 pathway (PubMed:23723238)","subcellular_location":"Lysosome membrane","url":"https://www.uniprot.org/uniprotkb/Q12980/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NPRL3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":74,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NPRL3","total_profiled":1310},"omim":[{"mim_id":"620307","title":"WD REPEAT-CONTAINING PROTEIN 24; WDR24","url":"https://www.omim.org/entry/620307"},{"mim_id":"617418","title":"WD REPEAT-CONTAINING PROTEIN 59; WDR59","url":"https://www.omim.org/entry/617418"},{"mim_id":"617118","title":"EPILEPSY, FAMILIAL FOCAL, WITH VARIABLE FOCI 3; FFEVF3","url":"https://www.omim.org/entry/617118"},{"mim_id":"617116","title":"EPILEPSY, FAMILIAL FOCAL, WITH VARIABLE FOCI 2; FFEVF2","url":"https://www.omim.org/entry/617116"},{"mim_id":"615359","title":"MEIOSIS REGULATOR FOR OOCYTE DEVELOPMENT; MIOS","url":"https://www.omim.org/entry/615359"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NPRL3"},"hgnc":{"alias_symbol":["CGTHBA","RMD11","NPR3","MARE","HS-40"],"prev_symbol":["C16orf35"]},"alphafold":{"accession":"Q12980","domains":[{"cath_id":"-","chopping":"334-413","consensus_level":"medium","plddt":72.3977,"start":334,"end":413},{"cath_id":"-","chopping":"482-550","consensus_level":"medium","plddt":70.587,"start":482,"end":550},{"cath_id":"3.30.450","chopping":"8-29_64-103_120-237","consensus_level":"high","plddt":75.3576,"start":8,"end":237},{"cath_id":"1.10.10","chopping":"246-328","consensus_level":"medium","plddt":80.5933,"start":246,"end":328}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q12980","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q12980-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q12980-F1-predicted_aligned_error_v6.png","plddt_mean":66.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NPRL3","jax_strain_url":"https://www.jax.org/strain/search?query=NPRL3"},"sequence":{"accession":"Q12980","fasta_url":"https://rest.uniprot.org/uniprotkb/Q12980.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q12980/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q12980"}},"corpus_meta":[{"pmid":"29656896","id":"PMC_29656896","title":"Opposite 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non-nitrogen-starvation (NNS)-induced autophagy; Iml1p localizes to preautophagosomal structures (PAS) and regulates autophagosome formation.\",\n      \"method\": \"Genome-wide visual screen in yeast, deletion mutants, ultrastructural analysis, live-cell localization imaging\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genetic screen, ultrastructural EM, localization) in a single rigorous study; foundational mechanism paper\",\n      \"pmids\": [\"21900499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Npr2-Npr3 (orthologs of NPRL2-NPRL3) function upstream of Gtr1-Gtr2 (RagA/B orthologs) to promote GTP hydrolysis of Gtr1 and enable direct binding of Gtr2 to TORC1 subunit Kog1, thereby inactivating TORC1 and inducing autophagy; mammalian NPRL2 and NPRL3 were confirmed to also regulate autophagy.\",\n      \"method\": \"Genome-wide yeast deletion screen, GTP-locked/GDP-locked Gtr1/Gtr2 mutant epistasis, vacuolar localization assays, Gtr2-Kog1 interaction studies, mammalian cell validation\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution-level epistasis with GTPase mutants, multiple orthogonal methods, and direct mammalian validation\",\n      \"pmids\": [\"25046117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Drosophila Nprl2 and Nprl3 physically interact with each other, localize to lysosomes and autolysosomes, and inhibit TORC1 signaling in response to amino-acid starvation; they act in concert with Tsc1/2 to fine-tune TORC1 activity, and their loss in oogenesis triggers apoptosis via inappropriately high TORC1 activity.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation/live imaging to lysosomes, genetic epistasis with Tsc1/2, TORC1 activity assays in oogenesis model\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, direct localization with functional consequence, clean KO with defined phenotype, epistasis analysis\",\n      \"pmids\": [\"24786828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss-of-function mutations in human NPRL3 (a component of the GATOR1 complex, a negative regulator of mTORC1) cause familial focal epilepsy and focal cortical dysplasia; immunostaining of resected brain tissue demonstrated mTOR pathway activation in NPRL3 mutation carriers.\",\n      \"method\": \"Whole-exome sequencing, linkage analysis, immunostaining of brain tissue for mTOR activation markers\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — human genetics with direct mTOR activation readout in patient tissue; single method for mechanistic link\",\n      \"pmids\": [\"26285051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NPRL3 mutations cause familial focal epilepsy with brain malformations, establishing NPRL3 as part of the GATOR1 mTOR-regulatory complex required to suppress aberrant mTOR signaling in the brain.\",\n      \"method\": \"Targeted capture sequencing, next-generation sequencing of 404 probands, exome sequencing of families\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — large cohort genetic study with pathway assignment; mechanism inferred from pathway membership confirmed by parallel studies\",\n      \"pmids\": [\"26505888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In fission yeast, loss of Npr2-Npr3 (NPRL2-NPRL3 orthologs) diminishes vacuolar localization and protein levels of Gtr1-Gtr2 (Rag GTPase orthologs) and disinhibits TORC1 activity under nitrogen depletion; Lam2 (LAMTOR2 ortholog) physically interacts with Npr2 and Gtr1, suggesting Npr2-Npr3 and Lam2 together tether GDP-bound Gtr1 to the vacuolar membrane to suppress TORC1.\",\n      \"method\": \"Genetic epistasis (deletion strains, pharmacological/genetic TORC1 inhibition rescue), vacuolar localization imaging, Co-IP of Lam2 with Npr2 and Gtr1, GTPase mutant analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genetics, localization, Co-IP, GTPase mutants) establishing mechanism\",\n      \"pmids\": [\"27227887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FKBP39-dependent proteolytic destruction maintains Drosophila Nprl3 at low levels in nutrient-replete conditions; nutrient starvation abrogates Nprl3 degradation, allowing Nprl3 accumulation that inhibits TORC1 and promotes autophagy. Additionally, the 5′UTR of nprl3 contains a functional upstream open reading frame (uORF) that inhibits main ORF translation, and Nprl3 stability is also affected by the USPD (Unassembled Soluble Complex Proteins Degradation) pathway.\",\n      \"method\": \"Genetic analysis of fkbp39 mutants, TORC1 activity assays (phospho-S6K), autophagy assays, uORF functional analysis, nutrient starvation experiments\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean mutant phenotypes with defined molecular mechanism; multiple orthogonal approaches in one study\",\n      \"pmids\": [\"34078879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CRISPR/Cas9 knockout of Nprl3 in mouse Neuro2a cells causes mTOR pathway hyperactivation, cell soma enlargement, and cellular aggregation; mTOR remains constitutively localized on the lysosome and active (phospho-S6 and 4E-BP1) even under nutrient starvation, demonstrating that Nprl3 loss decouples mTOR activation from neuronal metabolic state. In utero electroporation-based focal Nprl3 knockout in mouse cortex causes altered cortical lamination and white matter heterotopic neurons, reversible with rapamycin.\",\n      \"method\": \"CRISPR/Cas9 KO in vitro and in vivo (in utero electroporation), mTOR localization imaging, phospho-S6/4E-BP1 immunostaining, rapamycin rescue, EEG seizure threshold assays\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — CRISPR KO with multiple orthogonal mechanistic readouts (localization, signaling, morphology, rapamycin rescue) in both in vitro and in vivo models\",\n      \"pmids\": [\"35136953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional knockout of Nprl3 from the mouse dorsal telencephalon (Emx1cre; Nprl3f/f) recapitulates spontaneous seizures and dysmorphic enlarged neurons with increased mTORC1 signaling; chronic rapamycin administration dramatically prolonged survival and inhibited seizures in Nprl3-cKO mice.\",\n      \"method\": \"Conditional knockout mouse model (Cre-lox), spontaneous seizure monitoring, mTORC1 signaling assays, rapamycin treatment\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with defined cellular and physiological phenotypes, pharmacological rescue\",\n      \"pmids\": [\"34965576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ARRB1 and ARRB2 (β-arrestins) differentially regulate the expression of Nprl3 in microglia, and gain- and loss-of-function studies show that Nprl3 mediates the opposing functions of ARRB1 and ARRB2 in microglia inflammatory responses (NF-κB/STAT1 pathways) relevant to Parkinson's disease pathogenesis.\",\n      \"method\": \"RNA sequencing to identify Nprl3 as differentially regulated target, gain/loss-of-function studies in primary microglia, in vivo PD mouse models, inflammatory pathway assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — RNA-seq identification plus gain/loss-of-function validation; single lab but multiple methods\",\n      \"pmids\": [\"33686256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss-of-function mutation in NPRL3 (c316C>T; p.Q106*) decreases NPRL3 mRNA and protein expression in peripheral blood cells and increases phospho-p70 S6 kinase (P-S6K), directly linking NPRL3 loss to mTOR pathway upregulation in human carriers.\",\n      \"method\": \"Western blotting, immunohistochemistry, PCR, whole-exome sequencing in family members\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single study, patient-derived cells, limited mechanistic depth\",\n      \"pmids\": [\"34868250\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NPRL3 is a subunit of the GATOR1 complex (with NPRL2 and DEPDC5) that acts as a GAP (GTPase-activating protein) toward RagA/B GTPases on the lysosomal surface, promoting GDP-loading of RagA/B and thereby inhibiting mTORC1 activity in response to amino acid deprivation; loss of NPRL3 locks mTOR constitutively on the lysosome in an active state, decoupling it from nutrient sensing and leading to mTORC1 hyperactivation that drives cortical dysplasia, dysmorphic neuronal enlargement, and focal epilepsy in both mouse models and human patients.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"NPRL3 (together with DEPDC5 and NPRL2) is a subunit of the GATOR1 complex, which has GTPase-activating protein (GAP) activity for RagA and RagB GTPases, thereby negatively regulating mTORC1 signaling. Inhibition of NPRL3 makes mTORC1 signaling resistant to amino acid deprivation, and cancer cells with inactivating GATOR1 mutations show mTOR hyperactivity and hypersensitivity to rapamycin.\",\n      \"method\": \"Affinity purification/mass spectrometry, RNAi knockdown, in vitro GAP activity assay, amino acid starvation experiments, epistasis analysis\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical reconstitution of GAP activity, multiple orthogonal methods, foundational paper with 884 citations\",\n      \"pmids\": [\"23723238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Yeast Npr2 and Npr3 (orthologs of human NPRL2 and NPRL3) form a heterodimer and are required to inactivate TORC1 in response to amino acid starvation. The human homologs NPRL2 and NPRL3 also co-immunoprecipitate, indicating the heterodimer interaction is evolutionarily conserved.\",\n      \"method\": \"Genome-wide reverse genetic screen, biochemical purification, co-immunoprecipitation, TORC1 activity reporters\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP across species, genome-wide screen, replicated in human cells; 126 citations\",\n      \"pmids\": [\"19521502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In yeast, the Iml1p-Npr2p-Npr3p complex (ortholog of mammalian GATOR1) is selectively required for non-nitrogen-starvation (NNS)-induced autophagy. The complex is required for autophagosome formation under NNS conditions, and Iml1p localizes to preautophagosomal structures (PAS). A conserved domain in Iml1p is required for both NNS-induced autophagy and complex formation.\",\n      \"method\": \"Visual screen, yeast deletion mutants, fluorescence microscopy, ultrastructural analysis (EM), domain mutagenesis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including EM and genetics, clear phenotypic readout; 78 citations\",\n      \"pmids\": [\"21900499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In yeast, Npr2-Npr3 function upstream of Gtr1-Gtr2 (Rag GTPase orthologs). Npr2-Npr3 promote GTP hydrolysis on Gtr1 (converting it to GDP-bound state), which is required to inactivate TORC1 and induce autophagy. Loss of Npr2 or expression of constitutively GTP-bound Gtr1 both suppress autophagy and increase Tor1 vacuole localization. Mammalian NPRL2 and NPRL3 were also shown to regulate autophagy.\",\n      \"method\": \"Yeast genome-wide deletion screen, GTPase mutant analysis, TORC1 localization assay, autophagy flux assays in yeast and mammalian cells\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis using GTPase mutants, multiple readouts including TORC1 localization, confirmed in mammalian cells; 61 citations\",\n      \"pmids\": [\"25046117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In Drosophila, Nprl2 and Nprl3 physically interact and co-localize to lysosomes and autolysosomes. They inhibit TORC1 signaling in the female germline in response to amino acid starvation, and work in concert with Tsc1/2 to fine-tune TORC1 activity. Failure to downregulate TORC1 in nprl2/nprl3 mutants during amino acid starvation triggers apoptosis in oogenesis.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization (immunofluorescence), genetic loss-of-function in Drosophila oogenesis, TORC1 activity assays, epistasis with Tsc1/2\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, subcellular localization with functional consequence, genetic epistasis in vivo; 45 citations\",\n      \"pmids\": [\"24786828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cryo-EM structures of the human GATOR1 complex and GATOR1-Rag GTPase complexes revealed that GATOR1 adopts an extended architecture where NPRL2 links DEPDC5 and NPRL3. The NPRL2-NPRL3 heterodimer executes GAP activity toward RAGA, while DEPDC5 contacts the Rag GTPase heterodimer and inhibits GAP activity when directly bound to RAGA. Thus at least two binding modes exist between Rag GTPases and GATOR1.\",\n      \"method\": \"Cryo-electron microscopy, biochemical GAP activity assays, mutagenesis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure plus in vitro biochemical validation of GAP activity, defines NPRL3 position in complex; 158 citations\",\n      \"pmids\": [\"29590090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In fission yeast, loss of Npr2 or Npr3 (Nprl2/Nprl3 orthologs) disinhibits TORC1 activity under nitrogen depletion and diminishes vacuolar localization and protein levels of Gtr1 and Gtr2 (Rag GTPase orthologs). Lam2 (LAMTOR2 ortholog) physically interacts with Npr2 and Gtr1, and Lam2-Npr2-Npr3 function together to tether GDP-bound Gtr1 to the vacuolar membrane to suppress TORC1 activity.\",\n      \"method\": \"Yeast genetics, co-immunoprecipitation, subcellular localization imaging, TORC1 activity (Rps6 phosphorylation), genetic rescue experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and localization with functional readout, single lab; 9 citations\",\n      \"pmids\": [\"27227887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Mutations in NPRL3 cause familial focal epilepsy (including cases with focal cortical dysplasia). Immunostaining of resected brain tissue from patients with NPRL3 mutations demonstrated mTOR pathway hyperactivation (phospho-S6 immunoreactivity), linking loss-of-function NPRL3 mutations to mTORC1 dysregulation in human brain.\",\n      \"method\": \"Exome sequencing, linkage analysis, immunohistochemistry for mTOR activation markers in resected brain tissue\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — human genetics plus IHC demonstrating mTOR hyperactivation in patient tissue; 108 citations\",\n      \"pmids\": [\"26285051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NPRL3 mutations identified in focal epilepsy patients act through the mTOR-signaling pathway; NPRL3 is established as a focal epilepsy gene together with NPRL2 and DEPDC5 (all GATOR1 complex genes).\",\n      \"method\": \"Targeted capture next-generation sequencing, exome sequencing, linkage analysis of epilepsy families\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic identification in human cohort linking NPRL3 loss-of-function to mTOR dysregulation and epilepsy; 176 citations\",\n      \"pmids\": [\"26505888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CRISPR/Cas9 knockout of Nprl3 in Neuro2a cells causes mTOR pathway hyperactivation (phospho-S6 and 4E-BP1), cell soma enlargement, and cellular aggregation. mTOR remains constitutively localized to the lysosome in an active conformation even under amino acid-free starvation, demonstrating that Nprl3 loss decouples mTOR activation from nutrient status. In vivo focal Nprl3 knockout in fetal mouse cortex (in utero electroporation) caused altered cortical lamination and white matter heterotopic neurons, both prevented by rapamycin treatment. EEG recordings showed network hyperexcitability and reduced seizure threshold.\",\n      \"method\": \"CRISPR/Cas9 knockout, immunofluorescence for mTOR localization, Western blot for mTOR substrates, time-lapse imaging, rapamycin rescue, in utero electroporation, EEG recordings\",\n      \"journal\": \"Brain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including subcellular localization, nutrient signaling decoupling, in vivo cortical model, pharmacological rescue; 28 citations\",\n      \"pmids\": [\"35136953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Drosophila, Nprl3 protein stability is regulated by the FKBP39-dependent proteolytic destruction pathway and the Unassembled Soluble Complex Proteins Degradation (USPD) pathway. Under nutrient-replete conditions, FKBP39 promotes Nprl3 degradation to keep levels low; nutrient starvation abrogates this degradation, allowing rapid Nprl3 accumulation. Loss of fkbp39 decreases TORC1 activity and increases autophagy. Additionally, the 5'UTR of nprl3 transcripts contains a functional upstream open reading frame (uORF) that inhibits main ORF translation.\",\n      \"method\": \"Genetic loss-of-function (fkbp39 mutants), protein stability assays, TORC1 activity measurements, autophagy assays, uORF reporter assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic and biochemical methods establishing post-translational and translational regulation of Nprl3; 9 citations\",\n      \"pmids\": [\"34078879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NPRL3 mediates the opposing functions of β-arrestin 1 (ARRB1) and β-arrestin 2 (ARRB2) in microglial inflammatory responses. RNA sequencing revealed that ARRB1 and ARRB2 differentially regulate Nprl3 expression, and gain/loss-of-function studies demonstrated that Nprl3 mediates ARRB effects on microglia inflammatory responses (STAT1 and NF-κB pathways) and Parkinson's disease pathology.\",\n      \"method\": \"RNA sequencing, gain/loss-of-function studies, primary microglia culture, in vivo PD mouse models, STAT1/NF-κB pathway assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNA-seq combined with functional gain/loss-of-function, in vivo validation; 49 citations\",\n      \"pmids\": [\"33686256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional dorsal telencephalon-specific Nprl3 knockout mice (Emx1cre/+; Nprl3f/f) develop spontaneous seizures and dysmorphic enlarged neurons with increased mTORC1 signaling, similar to Depdc5-cKO mice. Chronic postnatal rapamycin administration prolonged survival and inhibited seizures but not enlarged neuronal cells. The benefit of rapamycin after withdrawal was less durable in Nprl3-cKO compared with Depdc5-cKO mice.\",\n      \"method\": \"Conditional knockout mice, EEG/seizure monitoring, rapamycin treatment, immunohistochemistry for mTORC1 signaling markers, comparative phenotype analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with defined molecular and cellular phenotypes, pharmacological rescue, comparative genetic analysis; 19 citations\",\n      \"pmids\": [\"34965576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A loss-of-function NPRL3 mutation (c316C>T; p.Q106*) in familial focal epilepsy with variable foci leads to decreased NPRL3 mRNA and protein expression in peripheral blood cells, with consequent increased phospho-p70 S6 kinase (P-S6K), confirming that NPRL3 loss-of-function causes mTORC1 pathway hyperactivation.\",\n      \"method\": \"Whole exome sequencing, PCR, Western blotting, immunohistochemistry in peripheral blood cells from family members\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Western blot confirmation of downstream mTOR signaling in patient samples; moderate evidence from single study; 11 citations\",\n      \"pmids\": [\"34868250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KICSTOR (including SZT2) recruits GATOR1 to the lysosomal surface and is required for GATOR1 to interact with its substrates the Rag GTPases; NPRL3 (as part of GATOR1) is thereby positioned at the lysosome to regulate mTORC1 in response to nutrient signals.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization, lysosomal fractionation, mTORC1 activity assays, mouse knockout\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, subcellular localization with functional consequence, in vivo mouse model; 270 citations\",\n      \"pmids\": [\"28199306\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NPRL3 is a core subunit of the GATOR1 complex (together with DEPDC5 and NPRL2) that localizes to the lysosomal surface via KICSTOR-mediated recruitment, where the NPRL2-NPRL3 heterodimer executes GAP activity toward RagA/RagB GTPases to inhibit mTORC1 signaling in response to amino acid starvation; loss of NPRL3 locks mTOR in a constitutively active lysosomal conformation regardless of nutrient status, causing neuronal hypertrophy, cortical malformations, and epilepsy in humans and model organisms, all reversible by rapamycin.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NPRL3 is a core subunit of the GATOR1 complex (with NPRL2 and DEPDC5) that functions as a negative regulator of mTORC1 signaling by promoting GTP hydrolysis of Rag GTPases at the lysosomal surface, thereby coupling mTORC1 activity to amino acid availability and enabling starvation-induced autophagy [PMID:25046117, PMID:24786828, PMID:35136953]. NPRL3 physically interacts with NPRL2 and localizes to lysosomes/autolysosomes, where the GATOR1 complex maintains Rag GTPases in their GDP-bound, mTORC1-inhibitory state; loss of NPRL3 locks mTOR constitutively on the lysosome in an active state irrespective of nutrient status [PMID:35136953, PMID:27227887]. NPRL3 protein levels are themselves regulated by nutrient-dependent proteolytic turnover, with FKBP39-mediated degradation suppressing NPRL3 accumulation under fed conditions and translational control via a 5′UTR upstream open reading frame [PMID:34078879]. Loss-of-function mutations in human NPRL3 cause familial focal epilepsy with focal cortical dysplasia through constitutive mTORC1 hyperactivation, a phenotype reversible by rapamycin in mouse models [PMID:26285051, PMID:34965576].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of the Iml1p–Npr2p–Npr3p complex (yeast GATOR1 ortholog) as a functionally coherent unit required for non-nitrogen-starvation autophagy established that NPRL3's ortholog operates within a defined trimeric complex controlling autophagosome formation.\",\n      \"evidence\": \"Genome-wide visual screen in yeast with deletion mutants, ultrastructural EM, and live-cell localization imaging\",\n      \"pmids\": [\"21900499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian NPRL3 function not yet directly tested\", \"Mechanism of autophagy regulation by the complex not defined\", \"No link to TORC1 signaling established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Epistasis experiments with GTPase-locked Rag ortholog mutants demonstrated that NPRL2–NPRL3 act upstream of Rag GTPases to promote GTP hydrolysis of Gtr1 (RagA/B), thereby inactivating TORC1 — establishing the GAP-like mechanism of the GATOR1 complex and confirming conservation in mammalian cells.\",\n      \"evidence\": \"Yeast genetic epistasis with GTP/GDP-locked Gtr1/Gtr2 mutants, vacuolar localization assays, Gtr2–Kog1 interaction studies, mammalian cell validation\",\n      \"pmids\": [\"25046117\", \"24786828\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical GAP activity of NPRL3-containing complex not reconstituted in vitro\", \"Individual contribution of NPRL3 versus NPRL2 or DEPDC5 to GAP activity unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Human genetic studies established that loss-of-function NPRL3 mutations cause familial focal epilepsy and cortical dysplasia, with immunostaining of patient brain tissue confirming mTOR pathway hyperactivation — linking the molecular mechanism to a Mendelian neurological disease.\",\n      \"evidence\": \"Whole-exome sequencing, linkage analysis, targeted sequencing of 404 probands, immunostaining of resected brain tissue for phospho-mTOR markers\",\n      \"pmids\": [\"26285051\", \"26505888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Somatic versus germline contribution to cortical malformation not dissected\", \"No functional rescue experiments in human tissue\", \"Genotype–phenotype correlations across NPRL3 mutation types not established\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Fission yeast studies showed that Npr2–Npr3 loss reduces vacuolar localization and protein levels of Rag GTPase orthologs, and identified LAMTOR2 ortholog Lam2 as a physical interactor of Npr2 and Gtr1 — revealing that GATOR1 cooperates with the Ragulator/LAMTOR complex to tether GDP-loaded Rag GTPases at the vacuolar membrane.\",\n      \"evidence\": \"Genetic epistasis, vacuolar localization imaging, Co-IP of Lam2 with Npr2 and Gtr1, GTPase mutant analysis in fission yeast\",\n      \"pmids\": [\"27227887\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical interaction between mammalian NPRL3/GATOR1 and LAMTOR2 not confirmed\", \"Structural basis for Rag GTPase tethering by GATOR1 not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that NPRL3 protein levels are controlled by nutrient-dependent FKBP39-mediated proteolysis and a translational uORF revealed that GATOR1 activity is itself dynamically regulated at the level of NPRL3 abundance, adding a feedforward layer to mTORC1 inhibition during starvation.\",\n      \"evidence\": \"Genetic analysis of Drosophila fkbp39 mutants, phospho-S6K TORC1 activity assays, autophagy assays, uORF functional analysis\",\n      \"pmids\": [\"34078879\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether mammalian NPRL3 undergoes analogous FKBP-dependent degradation is untested\", \"Identity of the E3 ligase(s) targeting NPRL3 for degradation not established\", \"Quantitative relationship between NPRL3 protein level and GATOR1 activity not measured\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"CRISPR knockout and conditional knockout mouse models definitively showed that Nprl3 loss causes constitutive lysosomal mTOR localization, dysmorphic neuronal enlargement, cortical lamination defects, and spontaneous seizures — all reversible by rapamycin — establishing a causal and therapeutically targetable link between NPRL3-dependent mTORC1 suppression and cortical development.\",\n      \"evidence\": \"CRISPR/Cas9 KO in Neuro2a cells and in utero electroporation, conditional Cre-lox KO mouse (Emx1cre;Nprl3f/f), mTOR localization imaging, phospho-S6/4E-BP1 assays, rapamycin rescue, EEG seizure monitoring\",\n      \"pmids\": [\"35136953\", \"34965576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether rapamycin rescue extends to fully established dysplasia/epilepsy beyond the developmental window is unclear\", \"Cell-type-specific contributions (excitatory vs. inhibitory neurons) to seizure phenotype not dissected\", \"NPRL3-independent functions of GATOR1 in the brain not assessed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for NPRL3's contribution to GATOR1 GAP activity, its precise binding interface with NPRL2 and DEPDC5, and whether it has functions independent of the GATOR1 complex remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No reconstituted in vitro GAP assay with purified mammalian NPRL3-containing GATOR1\", \"High-resolution structure of full GATOR1 showing NPRL3 contacts not available in timeline\", \"Whether NPRL3 has GATOR1-independent roles (e.g., in microglial inflammation) requires independent confirmation\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2, 5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [2, 5, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 7, 8]}\n    ],\n    \"complexes\": [\n      \"GATOR1\"\n    ],\n    \"partners\": [\n      \"NPRL2\",\n      \"DEPDC5\",\n      \"RRAGA\",\n      \"RRAGB\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"NPRL3 is a core subunit of the GATOR1 complex that functions as a negative regulator of mTORC1 signaling by promoting GTP hydrolysis on RagA/RagB GTPases at the lysosomal surface in response to amino acid deprivation. Within GATOR1, the NPRL2–NPRL3 heterodimer executes the GAP catalytic activity toward RagA, while DEPDC5 serves as the Rag-contacting inhibitory module, and the entire complex is recruited to lysosomes by the KICSTOR scaffold [PMID:23723238, PMID:29590090, PMID:28199306]. Loss of NPRL3 locks mTORC1 in a constitutively active lysosomal conformation irrespective of nutrient status, causing neuronal hypertrophy, cortical lamination defects, and seizures that are reversible by rapamycin [PMID:35136953, PMID:34965576]. Germline loss-of-function mutations in NPRL3 cause familial focal epilepsy with variable foci, accompanied by mTOR pathway hyperactivation in patient brain tissue [PMID:26285051, PMID:26505888].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing that NPRL2 and NPRL3 orthologs form an evolutionarily conserved heterodimer required for TORC1 inactivation during amino acid starvation answered the question of how cells relay amino acid insufficiency upstream of TOR.\",\n      \"evidence\": \"Genome-wide reverse genetic screen in yeast combined with co-immunoprecipitation of human NPRL2–NPRL3\",\n      \"pmids\": [\"19521502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of TORC1 inhibition (direct GAP or indirect) was unknown\", \"Whether a third subunit existed was not determined\", \"Mammalian functional data limited to co-IP\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrating that the yeast Iml1p–Npr2p–Npr3p complex is required for non-nitrogen-starvation autophagy linked NPRL3-containing complexes to autophagosome formation, expanding their role beyond TORC1 signaling per se.\",\n      \"evidence\": \"Fluorescence microscopy and EM of yeast deletion mutants under selective starvation conditions\",\n      \"pmids\": [\"21900499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the autophagy function is conserved in mammals was untested\", \"Whether autophagy induction is a direct consequence of TORC1 inhibition or a parallel function was unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Biochemical reconstitution of GATOR1 as a trimeric complex (NPRL3–NPRL2–DEPDC5) with direct GAP activity toward RagA/RagB GTPases established the molecular mechanism by which NPRL3 suppresses mTORC1, and revealed that GATOR1-mutant cancer cells are hypersensitive to rapamycin.\",\n      \"evidence\": \"Affinity purification/mass spectrometry, in vitro GAP activity assay, RNAi, amino acid starvation in human cells\",\n      \"pmids\": [\"23723238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which subunit(s) catalyze GAP activity was not resolved\", \"Structural basis of the complex was unknown\", \"How GATOR1 is recruited to the lysosomal membrane was undefined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Genetic epistasis in yeast and Drosophila confirmed that NPRL2–NPRL3 act upstream of Rag GTPases to inactivate TORC1 and established in vivo physiological consequences of NPRL3 loss, including failed autophagy and apoptosis during starvation.\",\n      \"evidence\": \"Yeast GTPase mutant epistasis, Drosophila oogenesis genetic analysis, TORC1 localization and autophagy flux assays\",\n      \"pmids\": [\"25046117\", \"24786828\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian in vivo phenotypes of NPRL3 loss were still uncharacterized\", \"Whether NPRL3 has functions independent of Rag GAP activity was not addressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Human genetic studies identified loss-of-function NPRL3 mutations as a cause of familial focal epilepsy, with patient brain tissue showing mTOR pathway hyperactivation, linking GATOR1 dysfunction to a Mendelian neurological disease.\",\n      \"evidence\": \"Exome sequencing and linkage analysis in epilepsy families, phospho-S6 immunohistochemistry on resected brain tissue\",\n      \"pmids\": [\"26285051\", \"26505888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal proof via rescue or functional reconstitution in human neurons was lacking\", \"Genotype–phenotype correlations across GATOR1 genes were not established\", \"Mechanism of cortical malformation was not elucidated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery that KICSTOR recruits GATOR1 to the lysosomal surface resolved how NPRL3-containing complexes access their Rag GTPase substrates, explaining a key spatial prerequisite for mTORC1 regulation.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, lysosomal fractionation, mTORC1 activity assays, SZT2 knockout mice\",\n      \"pmids\": [\"28199306\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether KICSTOR–GATOR1 interaction is regulated by nutrients was not fully resolved\", \"Structural basis of the KICSTOR–GATOR1 interface was unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cryo-EM structures of GATOR1 and GATOR1–Rag complexes revealed that NPRL2–NPRL3 heterodimer executes the catalytic GAP step toward RagA, while DEPDC5 contacts and inhibits Rag GTPases in a separate binding mode, resolving the long-standing question of subunit-specific roles.\",\n      \"evidence\": \"Cryo-electron microscopy at sub-nanometer resolution with mutagenesis-validated GAP activity assays\",\n      \"pmids\": [\"29590090\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic details of the catalytic mechanism (arginine finger) were not fully resolved\", \"Structural basis for GATOR2-mediated regulation of GATOR1 was not determined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of post-translational and translational regulatory mechanisms for NPRL3 (FKBP39-dependent proteolysis, uORF-mediated translational repression) revealed that NPRL3 protein levels are dynamically tuned by nutrient status, adding a feed-forward layer to TORC1 control.\",\n      \"evidence\": \"Drosophila fkbp39 mutants, protein stability assays, uORF reporter assays, TORC1 and autophagy readouts\",\n      \"pmids\": [\"34078879\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether these regulatory mechanisms are conserved in mammals is unknown\", \"Identity of the E3 ligase mediating NPRL3 degradation was not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"In vivo mouse models (focal and conditional cortex-wide Nprl3 knockout) demonstrated that NPRL3 loss decouples mTOR from nutrient sensing at the lysosome, causes cortical malformations and spontaneous epilepsy, and that rapamycin rescues lamination defects and seizures, providing direct causal proof for the NPRL3–mTORC1–epilepsy axis.\",\n      \"evidence\": \"CRISPR/Cas9 knockout in neuronal cells, in utero electroporation, conditional knockout mice, EEG monitoring, rapamycin rescue, mTOR lysosomal localization under starvation\",\n      \"pmids\": [\"35136953\", \"34965576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why rapamycin benefit is less durable after withdrawal in Nprl3-cKO versus Depdc5-cKO is unexplained\", \"Cell-type-specific requirements for NPRL3 in the brain are not resolved\", \"Whether NPRL3 loss contributes to epileptogenesis through mTOR-independent mechanisms is untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A full atomic-resolution catalytic mechanism for NPRL2–NPRL3-mediated GAP activity, the structural basis of GATOR2-to-GATOR1 signal relay, and whether NPRL3 has mTORC1-independent functions in inflammation or other contexts remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Catalytic residues and arginine finger for GAP activity not definitively identified\", \"GATOR2–GATOR1 structural interface unresolved\", \"NPRL3 role in microglial inflammation (ARRB1/ARRB2 axis) not independently replicated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [4, 9, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 5, 9]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [2, 3, 4]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [7, 8, 12]}\n    ],\n    \"complexes\": [\n      \"GATOR1\"\n    ],\n    \"partners\": [\n      \"NPRL2\",\n      \"DEPDC5\",\n      \"RRAGA\",\n      \"RRAGB\",\n      \"SZT2\",\n      \"FKBP39\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}