{"gene":"SGPL1","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1998,"finding":"Identification of the first mammalian sphingosine-1-phosphate lyase (SPL) gene via homology to C. elegans SPL. The mouse gene functionally complemented an S1P lyase-deficient yeast strain (dpl1Δ), restoring sphingosine resistance, and in vitro enzyme assays confirmed SPL catalytic activity in yeast expressing the mouse cDNA. Northern analysis showed tissue-specific expression.","method":"Yeast complementation assay, in vitro enzyme assay, Northern blot","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — functional complementation in yeast plus in vitro enzymatic activity confirmed in same study","pmids":["9464245"],"is_preprint":false},{"year":2004,"finding":"SGPL1 (SPL) is an endoplasmic reticulum-resident, integral membrane protein. Its large hydrophilic domain containing the active site (pyridoxal 5'-phosphate binding domain) faces the cytosol, as shown by proteinase K digestion of membrane fractions. This active-site orientation is opposite to that of S1P phosphohydrolase, indicating that two S1P-degrading enzymes act on spatially separated sides of the ER membrane.","method":"Immunofluorescence microscopy (ER co-localization), proteinase K protection assay on membrane fractions, immunoblot","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1-2 — direct topology mapping by proteinase K protection combined with subcellular localization by immunofluorescence; multiple orthogonal methods in one study","pmids":["15522238"],"is_preprint":false},{"year":2006,"finding":"SGPL1 potentiates apoptosis in response to DNA damage via a mechanism requiring its enzymatic activity and dependent on p38 MAPK, p53, PIDD, and caspase-2. SPL expression led to constitutive p38 activation. This pro-apoptotic effect was independent of ceramide generation. Endogenous SPL was induced by DNA damage, and SPL knockdown diminished apoptotic responses. SPL expression was significantly down-regulated in human colon cancer tissues compared to normal adjacent tissues.","method":"Overexpression and knockdown in HEK293 cells, chemical and molecular inhibition of p38/p53/caspase-2, catalytic-dead mutant analysis, Q-PCR and immunohistochemistry of tumor tissues","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal inhibition approaches (chemical + genetic) establishing pathway order, combined with enzymatic activity requirement","pmids":["17090686"],"is_preprint":false},{"year":2009,"finding":"Complete genetic ablation of S1P lyase (S1PL/SGPL1) in mice caused lymphopenia with sequestration of mature T cells in thymus and lymph nodes, myeloid cell hyperplasia, and severe lesions in lung, heart, urinary tract, and bone, with markedly reduced lifespan. Humanized knock-in mice expressing <10-20% of normal S1PL activity were protected from lethal non-lymphoid lesions but still showed defective T-cell egress, demonstrating that lymphocyte trafficking is particularly sensitive to S1PL activity levels.","method":"Knockout and humanized knock-in mouse models; flow cytometry of T-cell compartments; histopathological analysis","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — clean KO and hypomorphic knock-in with defined cellular phenotypes establishing dose-dependent in vivo roles","pmids":["19119317"],"is_preprint":false},{"year":2016,"finding":"In oral squamous cell carcinoma (OSCC), low SGPL1 expression correlates with reduced S1P catabolism, and S1P enhanced migration/invasion of OSCC cells via S1PR2. SGPL1 manipulation in vitro demonstrated that the enzyme's activity shapes extracellular S1P levels available to drive S1PR2-mediated cell migration.","method":"In vitro migration/invasion assays, S1P receptor expression analysis, S1PR2 overexpression/knockdown, FTY720 apoptosis assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 — single-lab study linking SGPL1 activity to S1P-mediated migration via S1PR2, without full genetic rescue","pmids":["27160553"],"is_preprint":false},{"year":2017,"finding":"Recessive mutations in SGPL1 cause a syndromic form of steroid-resistant nephrotic syndrome (SRNS) with ichthyosis, adrenal insufficiency, immunodeficiency, and neurological defects. All disease-associated mutations resulted in reduced or absent SGPL1 protein and/or enzyme activity. Overexpression of mutant SGPL1 showed subcellular mislocalization. WT human SGPL1 rescued growth of SGPL1-deficient yeast (dpl1Δ), but disease variants did not. SGPL1 is expressed in mouse podocytes and mesangial cells; Sgpl1 knockdown in rat mesangial cells inhibited cell migration, partially rescued by an S1P receptor antagonist. In Drosophila, Sply mutants displayed a nephrotic syndrome-like nephrocyte phenotype rescued by WT but not mutant Sply.","method":"Whole exome sequencing, enzyme activity assays, yeast complementation, immunofluorescence/subcellular localization, siRNA knockdown with migration assay, Drosophila genetic rescue experiments","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods across multiple organisms (yeast, fly, mammalian cells) with rigorous genetic rescue controls; replicated across 7 families","pmids":["28165339"],"is_preprint":false},{"year":2017,"finding":"SGPL1 modulates autophagy in neurons through production of phosphatidylethanolamine (PE). SGPL1 cleaves S1P into ethanolamine phosphate, which is directed toward PE synthesis; PE anchors LC3-I to phagophore membranes as LC3-II. Neural-specific SGPL1 ablation (SGPL1fl/fl/Nes mice) reduced brain PE levels, decreased LC3-I to LC3-II conversion, increased BECN1 and SQSTM1/p62, altered lysosomal markers, and accumulated APP and α-synuclein. Addition of exogenous PE rescued LC3-I to LC3-II conversion and normalized SQSTM1, APP, and SNCA levels. Electron and immunofluorescence microscopy showed accumulation of unclosed phagophore-like structures.","method":"Conditional knockout mouse (Cre-lox), PE supplementation rescue, LC3 lipidation assay, EGFP-mRFP-LC3 autophagic flux reporter, electron microscopy, immunofluorescence, pharmacological inhibition","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo conditional KO with multiple orthogonal readouts plus metabolite rescue experiment demonstrating mechanistic link between SGPL1→PE→LC3 lipidation","pmids":["28521611"],"is_preprint":false},{"year":2018,"finding":"SGPL1 is expressed not only in the ER but also at the plasma membrane of non-tumorigenic mammary epithelial cells, as demonstrated by three independent methods (immunofluorescence, Western blot of membrane fractions, and flow cytometry). Loss of this plasma membrane SGPL1 expression in breast cancer cell lines correlated with S1P-dependent stimulation of migration. Overexpression of SGPL1 significantly reduced both S1P-stimulated and general migratory activity in breast cancer cells.","method":"Immunofluorescence microscopy, membrane fractionation Western blot, flow cytometry, migration assays with SGPL1 overexpression","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 — three convergent methods for plasma membrane localization, but single-lab study; functional consequence (migration) linked to localization loss","pmids":["29718989"],"is_preprint":false},{"year":2020,"finding":"SGPL1 deficiency is associated with mitochondrial dysfunction. Patient-derived dermal fibroblasts and CRISPR-engineered SGPL1-knockout HeLa cells showed reduced cortisol output, elevated sphingolipid intermediates (S1P, sphingosine, ceramides, sphingomyelin), reduced total mitochondrial volume, and altered mitochondrial dynamics and oxidative phosphorylation parameters compared to matched controls.","method":"Patient-derived fibroblasts, CRISPR-KO HeLa cells, mass spectrometric sphingolipid analysis, mitochondrial morphology imaging, oxidative phosphorylation measurement","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — two orthogonal cell models (patient cells + CRISPR KO) with biochemical and functional mitochondrial readouts, single lab","pmids":["32682944"],"is_preprint":false},{"year":2021,"finding":"AAV9-mediated delivery of human SGPL1 to newborn Sgpl1-KO mice dramatically prolonged survival and prevented nephrosis, neurodevelopmental delay, anemia, and hypercholesterolemia. SGPL1 expression and activity were measurable for at least 40 weeks post-treatment. Plasma and tissue sphingolipids were reduced in treated KO pups. STAT3 pathway activation and elevated pro-inflammatory/profibrogenic cytokines in KO kidneys were attenuated by treatment, establishing enzymatic SGPL1 activity as required for normal renal and systemic function.","method":"AAV9 gene delivery in KO mice, survival analysis, histopathology, sphingolipid mass spectrometry, cytokine profiling, STAT3 pathway analysis","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 — in vivo gene replacement with comprehensive multi-organ phenotypic rescue and biochemical validation of target engagement","pmids":["33755599"],"is_preprint":false},{"year":2022,"finding":"In a cell model of non-alcoholic fatty liver disease, SGPL1 overexpression abolished the anti-apoptotic effect of ginsenoside Rg1, downregulating pro-survival proteins Bcl-2, p-Akt, and p-Erk1/2 while upregulating pro-apoptotic Bax. This placed SGPL1 activity upstream of the Akt and Erk1/2 pro-survival signaling pathways in hepatocytes, consistent with its role in reducing S1P-dependent survival signaling.","method":"SGPL1 overexpression in HHL-5 hepatocytes, Western blot for Bcl-2/Bax/p-Akt/p-Erk1/2, apoptosis assays","journal":"Molecular medicine reports","confidence":"Low","confidence_rationale":"Tier 3 — single-lab overexpression study with phenotypic readout but limited mechanistic resolution; pathway placement inferred rather than directly demonstrated","pmids":["35322862"],"is_preprint":false}],"current_model":"SGPL1 (sphingosine-1-phosphate lyase 1) is an ER-resident integral membrane enzyme with its pyridoxal 5'-phosphate-containing active site facing the cytosol, where it irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and hexadecenal; this activity regulates intracellular and extracellular S1P levels to control lymphocyte trafficking, promotes stress-induced apoptosis via p38/p53/caspase-2, supports neuronal autophagy by supplying ethanolamine phosphate for phosphatidylethanolamine synthesis (which anchors LC3-I to phagophore membranes), and its loss causes mitochondrial dysfunction; loss-of-function mutations in humans cause a multi-systemic sphingolipidosis (SPLIS/NPHS14) featuring steroid-resistant nephrotic syndrome, adrenal insufficiency, ichthyosis, and neurological defects."},"narrative":{"teleology":[{"year":1998,"claim":"The identification of the mammalian SGPL1 gene established that S1P lyase activity—previously known only in yeast—is conserved in mammals, answering whether an irreversible S1P-degrading enzyme exists in higher eukaryotes.","evidence":"Homology cloning followed by functional complementation of yeast dpl1Δ and in vitro enzyme assay confirming catalytic activity","pmids":["9464245"],"confidence":"High","gaps":["Substrate specificity beyond S1P (e.g., dihydro-S1P) not characterized","No structural information on the enzyme"]},{"year":2004,"claim":"Topology mapping resolved how SGPL1 accesses its substrate by showing that the catalytic domain faces the cytosol on the ER membrane, placing it in a distinct compartment from S1P phosphohydrolase and establishing spatial partitioning of S1P catabolism.","evidence":"Proteinase K protection assay on microsomal membranes combined with ER co-localization by immunofluorescence","pmids":["15522238"],"confidence":"High","gaps":["Mechanism of S1P access across ER membrane leaflets unknown","Whether additional localization sites exist was not addressed"]},{"year":2006,"claim":"Demonstration that SGPL1 promotes apoptosis through p38/p53/caspase-2 in a catalytic-activity-dependent but ceramide-independent manner revealed a direct pro-apoptotic signaling role beyond mere lipid catabolism.","evidence":"Overexpression, knockdown, catalytic-dead mutant, and chemical/genetic inhibition of pathway components in HEK293 cells","pmids":["17090686"],"confidence":"High","gaps":["The specific SGPL1-generated metabolite (hexadecenal vs. reduced S1P) responsible for p38 activation was not identified","In vivo validation of p38-dependent apoptotic pathway not performed"]},{"year":2009,"claim":"KO and hypomorphic knock-in mouse models established that SGPL1 controls lymphocyte egress from thymus and lymph nodes in a dose-sensitive manner, and that complete loss causes multi-organ pathology and early death.","evidence":"Sgpl1 KO and humanized knock-in mice with <10–20% residual activity; flow cytometry of T-cell compartments and histopathology","pmids":["19119317"],"confidence":"High","gaps":["Whether S1P gradient disruption alone explains lymphocyte sequestration or cell-intrinsic effects contribute","Contribution of individual organs to lethality not dissected"]},{"year":2017,"claim":"Human genetic studies across seven families, coupled with yeast and Drosophila rescue experiments, proved that biallelic SGPL1 loss-of-function mutations cause a syndromic steroid-resistant nephrotic syndrome (SPLIS/NPHS14), definitively linking the enzyme to human Mendelian disease.","evidence":"WES of affected families; enzyme activity assays; yeast complementation; Drosophila nephrocyte rescue with WT vs. mutant Sply","pmids":["28165339"],"confidence":"High","gaps":["Pathogenic mechanism in podocytes not fully resolved—role of S1P receptor signaling vs. sphingolipid accumulation unclear","Genotype–phenotype correlations across the full clinical spectrum not established"]},{"year":2017,"claim":"Neural-specific SGPL1 ablation revealed that the enzyme's ethanolamine phosphate product feeds phosphatidylethanolamine synthesis required for LC3 lipidation, establishing SGPL1 as a metabolic regulator of autophagosome formation in the brain.","evidence":"Conditional KO mouse (Nestin-Cre), PE supplementation rescue of LC3-II conversion, autophagic flux reporter, electron microscopy","pmids":["28521611"],"confidence":"High","gaps":["Whether the PE-autophagy link operates outside the CNS not tested","Relative contributions of PE deficit vs. S1P accumulation to neurodegeneration not separated"]},{"year":2018,"claim":"Detection of SGPL1 at the plasma membrane of non-tumorigenic mammary cells expanded its known localization beyond the ER and suggested that loss of surface SGPL1 in breast cancer enables S1P-driven migration.","evidence":"Immunofluorescence, membrane fractionation, flow cytometry in normal vs. cancer cell lines; migration assays","pmids":["29718989"],"confidence":"Medium","gaps":["Mechanism of SGPL1 trafficking to the plasma membrane unknown","Whether plasma membrane activity has distinct substrates or kinetics not determined","Single-lab observation; independent confirmation needed"]},{"year":2020,"claim":"Patient-derived fibroblasts and CRISPR-KO cells demonstrated that SGPL1 deficiency causes mitochondrial dysfunction, linking sphingolipid accumulation to impaired oxidative phosphorylation and providing a mechanistic basis for the adrenal insufficiency seen in patients.","evidence":"Patient fibroblasts and CRISPR-KO HeLa cells; sphingolipid mass spectrometry, mitochondrial imaging, respirometry","pmids":["32682944"],"confidence":"Medium","gaps":["Whether mitochondrial defects are a direct consequence of specific sphingolipid species or secondary to general lipid imbalance","In vivo mitochondrial phenotypes in adrenal tissue not examined"]},{"year":2021,"claim":"AAV9-mediated SGPL1 gene replacement rescued survival, renal function, and sphingolipid homeostasis in KO mice and attenuated STAT3/pro-inflammatory cytokine activation in kidneys, providing proof-of-concept for gene therapy and identifying STAT3 as a downstream effector of SGPL1 deficiency.","evidence":"Neonatal AAV9 delivery in Sgpl1-KO mice; survival, histopathology, sphingolipid mass spectrometry, STAT3 and cytokine profiling","pmids":["33755599"],"confidence":"High","gaps":["Duration of therapeutic effect beyond 40 weeks not established","Whether STAT3 activation is a direct result of S1P signaling or secondary to inflammation not distinguished"]},{"year":null,"claim":"Key unresolved questions include the structural basis of SGPL1 catalysis and substrate selectivity, the mechanism by which hexadecenal (vs. loss of S1P) mediates downstream signaling, the relative pathogenic contributions of individual sphingolipid species in different organs, and how SGPL1 is trafficked to and functions at the plasma membrane.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of mammalian SGPL1","Hexadecenal-specific signaling targets uncharacterized","Organ-specific pathogenic mechanisms in SPLIS remain incompletely dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016829","term_label":"lyase activity","supporting_discovery_ids":[0,1,5,6,9]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1,5]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,6,8,9]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,10]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,9]}],"complexes":[],"partners":["TP53","CASP2","STAT3"],"other_free_text":[]},"mechanistic_narrative":"SGPL1 encodes sphingosine-1-phosphate lyase 1, a pyridoxal 5′-phosphate-dependent, ER-resident integral membrane enzyme that irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and hexadecenal, thereby serving as the terminal enzyme in sphingolipid catabolism [PMID:9464245, PMID:15522238]. By controlling intracellular and extracellular S1P levels, SGPL1 regulates lymphocyte egress from thymus and lymph nodes in a dose-dependent manner, promotes stress-induced apoptosis through p38 MAPK/p53/caspase-2 signaling, and supports neuronal autophagy by supplying ethanolamine phosphate for phosphatidylethanolamine synthesis required for LC3 lipidation [PMID:19119317, PMID:17090686, PMID:28521611]. SGPL1 deficiency causes mitochondrial dysfunction and sphingolipid accumulation, and its loss also activates STAT3 and pro-inflammatory signaling in the kidney [PMID:32682944, PMID:33755599]. Biallelic loss-of-function mutations in SGPL1 cause a syndromic steroid-resistant nephrotic syndrome (SPLIS/NPHS14) with adrenal insufficiency, ichthyosis, immunodeficiency, and neurological defects, as demonstrated by human genetic studies, cross-species rescue experiments, and AAV-mediated gene replacement in knockout mice [PMID:28165339, PMID:33755599]."},"prefetch_data":{"uniprot":{"accession":"O95470","full_name":"Sphingosine-1-phosphate lyase 1","aliases":["Sphingosine-1-phosphate aldolase"],"length_aa":568,"mass_kda":63.5,"function":"Cleaves phosphorylated sphingoid bases (PSBs), such as sphingosine-1-phosphate, into fatty aldehydes and phosphoethanolamine. Elevates stress-induced ceramide production and apoptosis (PubMed:11018465, PubMed:14570870, PubMed:24809814, PubMed:28165339). Required for global lipid homeostasis in liver and cholesterol homeostasis in fibroblasts. Involved in the regulation of pro-inflammatory response and neutrophil trafficking. Modulates neuronal autophagy via phosphoethanolamine production which regulates accumulation of aggregate-prone proteins such as APP (By similarity). Seems to play a role in establishing neuronal contact sites and axonal maintenance (By similarity)","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/O95470/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SGPL1","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000166224","cell_line_id":"CID000311","localizations":[{"compartment":"er","grade":3},{"compartment":"vesicles","grade":1}],"interactors":[{"gene":"CANX","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CSNK2B","stoichiometry":0.2},{"gene":"DDB1","stoichiometry":0.2},{"gene":"MBOAT7","stoichiometry":0.2},{"gene":"NPM1","stoichiometry":0.2},{"gene":"RBM39","stoichiometry":0.2},{"gene":"RPS16","stoichiometry":0.2},{"gene":"HBB;HBD","stoichiometry":0.2},{"gene":"LRRC59","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000311","total_profiled":1310},"omim":[{"mim_id":"617575","title":"RENI SYNDROME; RENI","url":"https://www.omim.org/entry/617575"},{"mim_id":"607506","title":"A DISINTEGRIN-LIKE AND METALLOPROTEINASE WITH THROMBOSPONDIN TYPE 1 MOTIF, 14; ADAMTS14","url":"https://www.omim.org/entry/607506"},{"mim_id":"603729","title":"SPHINGOSINE-1-PHOSPHATE LYASE 1; SGPL1","url":"https://www.omim.org/entry/603729"},{"mim_id":"603278","title":"FOCAL SEGMENTAL GLOMERULOSCLEROSIS 1; FSGS1","url":"https://www.omim.org/entry/603278"},{"mim_id":"256300","title":"NEPHROTIC SYNDROME, TYPE 1; NPHS1","url":"https://www.omim.org/entry/256300"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Endoplasmic reticulum","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SGPL1"},"hgnc":{"alias_symbol":["SPL"],"prev_symbol":[]},"alphafold":{"accession":"O95470","domains":[{"cath_id":"3.40.640.10","chopping":"170-412","consensus_level":"medium","plddt":98.589,"start":170,"end":412},{"cath_id":"3.90.1150.10","chopping":"413-545","consensus_level":"medium","plddt":94.7897,"start":413,"end":545},{"cath_id":"1.20.5","chopping":"38-71","consensus_level":"medium","plddt":84.4685,"start":38,"end":71},{"cath_id":"1.20.5","chopping":"72-107","consensus_level":"medium","plddt":74.6564,"start":72,"end":107}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95470","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95470-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95470-F1-predicted_aligned_error_v6.png","plddt_mean":92.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SGPL1","jax_strain_url":"https://www.jax.org/strain/search?query=SGPL1"},"sequence":{"accession":"O95470","fasta_url":"https://rest.uniprot.org/uniprotkb/O95470.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95470/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95470"}},"corpus_meta":[{"pmid":"19703399","id":"PMC_19703399","title":"miR156-regulated 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large hydrophilic domain containing the pyridoxal 5'-phosphate (PLP) binding active site faces the cytosol, as determined by proteinase K protection assays; this topology is opposite to that of S1P phosphohydrolase, indicating spatially separated S1P degradation on opposite sides of the ER membrane.\",\n      \"method\": \"Immunofluorescence microscopy, proteinase K digestion/topology assay, enzymatic activity measurements across tissues\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct subcellular fractionation, proteinase K protection assay, and enzymatic activity correlation; multiple orthogonal methods in single study\",\n      \"pmids\": [\"15522238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SGPL1 modulates neuronal autophagy by cleaving S1P into ethanolamine phosphate, which is channeled into phosphatidylethanolamine (PE) biosynthesis; PE is required to lipidation of LC3-I to LC3-II anchoring to phagophore membranes. Neural-specific SGPL1 ablation in mice reduces brain PE levels, decreases LC3-I→LC3-II conversion, increases BECN1/p62, and causes accumulation of phagophore-like unclosed structures and aggregate-prone proteins (APP, SNCA). Addition of exogenous PE rescued LC3 lipidation in SGPL1-deficient neurons.\",\n      \"method\": \"Conditional neuronal SGPL1 knockout (SGPL1fl/fl/Nes mice), pharmacological inhibition, PE supplementation rescue, electron microscopy, immunofluorescence, EGFP-mRFP-LC3 flux assay, western blot\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including in vivo KO, rescue experiment with PE, and autophagic flux reporters; strong mechanistic chain established\",\n      \"pmids\": [\"28521611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AAV9-mediated delivery of human SGPL1 to newborn Sgpl1-knockout mice rescues survival, prevents nephrosis, neurodevelopmental delay, anemia, and hypercholesterolemia, and reduces plasma and tissue sphingolipids, demonstrating that SGPL1 enzymatic activity is the causal mechanism underlying SPLIS pathology; treated animals showed measurable SGPL1 expression and activity for at least 40 weeks, and STAT3 pathway activation and pro-inflammatory cytokines in KO kidneys were attenuated.\",\n      \"method\": \"AAV9 gene transfer in Sgpl1-KO mouse model, sphingolipid mass spectrometry, histology, cytokine profiling, SGPL1 enzymatic activity assay\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo loss-of-function rescue with enzymatic activity readout; multiple phenotypic and biochemical endpoints across independent systems\",\n      \"pmids\": [\"33755599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SGPL1 deficiency causes mitochondrial dysfunction: patient-derived fibroblasts and CRISPR-engineered SGPL1-knockout HeLa cells display elevated sphingosine-1-phosphate, sphingosine, ceramide, and sphingomyelin; reduced total mitochondrial volume; and altered mitochondrial dynamics and oxidative phosphorylation parameters. Reduced cortisol output in response to progesterone was also observed in patient fibroblasts.\",\n      \"method\": \"Mass spectrometric sphingolipid analysis, mitochondrial morphology/volume quantification, oxidative phosphorylation measurement, CRISPR KO HeLa cells, patient-derived dermal fibroblasts\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two independent cell systems (patient fibroblasts and CRISPR KO), multiple metabolic readouts; single lab, no rescue experiment\",\n      \"pmids\": [\"32682944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SGPL1 protein is expressed not only in the ER but also at the plasma membrane of non-tumorigenic mammary epithelial cells; loss of this plasma membrane localization in breast cancer cell lines correlates with S1P-dependent migration enhancement. Overexpression of SGPL1 in cancer lines reduces migratory activity, establishing a functional link between SGPL1 localization/expression and extracellular S1P silencing.\",\n      \"method\": \"Immunofluorescence, confocal microscopy, western blot, migration assays, SGPL1 overexpression in MCF-7 and BT-20 cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — three independent localization methods plus functional migration rescue; novel localization finding but single lab\",\n      \"pmids\": [\"29718989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Aberrant SGPL1 (low expression) in oral squamous cell carcinoma (OSCC) contributes to elevated S1P levels, which promotes migration/invasion via S1P receptor 2 (S1PR2), as demonstrated by in vitro S1P stimulation assays and S1PR2 manipulation in OSCC cell lines.\",\n      \"method\": \"In vitro migration/invasion assays with S1P stimulation, S1PR2 siRNA knockdown, cell viability assays with FTY720, qRT-PCR\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional cell-based assays with receptor-specific knockdown; mechanistic pathway placement (SGPL1→S1P→S1PR2→migration) supported but indirect SGPL1 manipulation\",\n      \"pmids\": [\"27160553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SGPL1 overexpression in hepatocytes with steatosis abolishes the anti-apoptotic effect of ginsenoside Rg1 and downregulates pro-survival signals p-Akt and p-Erk1/2 while increasing Bax, placing SGPL1 upstream of the sphingosine signaling pathway that controls Bcl-2 family-mediated mitochondrial apoptosis in fatty liver cells.\",\n      \"method\": \"SGPL1 overexpression in HHL-5 hepatocyte NAFLD model, western blot for Bax/Bcl-2/p-Akt/p-Erk1/2, fat accumulation assay, apoptosis assay\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single overexpression experiment in one cell line; no direct measurement of SGPL1 enzymatic activity or S1P levels\",\n      \"pmids\": [\"35322862\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SGPL1 is an ER-resident integral membrane enzyme (with its PLP-containing active site facing the cytosol) that irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and hexadecenal, thereby terminating S1P signaling; the ethanolamine phosphate product feeds into phosphatidylethanolamine biosynthesis required for LC3 lipidation and neuronal autophagy initiation, loss of SGPL1 causes accumulation of sphingolipid intermediates, mitochondrial dysfunction, and multi-organ pathology (nephrosis, adrenal insufficiency, neurodegeneration), and SGPL1 activity at the plasma membrane of epithelial cells additionally suppresses extracellular S1P-driven cell migration.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries only from KEPT papers about SGPL1 (sphingosine-1-phosphate lyase 1).\n\n**Classification:**\n- Papers about plant SPL/miR156 (SQUAMOSA PROMOTER BINDING PROTEIN-LIKE): EXCLUDE (alias collision - plant transcription factors)\n- Papers about Drosophila/zebrafish E(spl)/Her genes: EXCLUDE (alias collision - Enhancer of split, different gene)\n- Papers about surfactant proteolipid SPL(Phe)/SPL(pVal): EXCLUDE (alias collision - lung surfactant proteins)\n- Papers about Staphylococcus aureus Spl proteases: EXCLUDE (alias collision - bacterial serine proteases)\n- Papers about spore photoproduct lyase SPL: EXCLUDE (alias collision - bacterial DNA repair enzyme)\n- Papers about spent pot liner SPL: EXCLUDE (industrial waste)\n- Papers about Pectinex Ultra SP-L: EXCLUDE\n- Papers about SGPL1 (sphingosine-1-phosphate lyase 1): KEEP\n\n**KEPT papers:**\n- PMID:15522238 - SPL localization/topology at ER\n- PMID:28521611 - SGPL1 modulates neuronal autophagy via PE production\n- PMID:27160553 - SGPL1/SPHK1 in OSCC migration via S1PR2\n- PMID:30090628 - SGPL1 variant causing nephrotic syndrome/adrenal insufficiency\n- PMID:30517686 - SGPL1 deficiency causing PAI\n- PMID:33755599 - AAV9-mediated SGPL1 gene transfer in mouse model\n- PMID:29718989 - SGPL1 expression in cell membrane\n- PMID:32682944 - SGPL1 deficiency associated with mitochondrial dysfunction\n- PMID:17090686 - SPL potentiates apoptosis via p53/p38 pathways\n- PMID:19119317 - S1PL knockout mouse model, T-cell trafficking\n- PMID:28165339 - SGPL1 mutations cause nephrosis with ichthyosis/adrenal insufficiency\n- PMID:9464245 - Identification of first mammalian SPL gene\n- PMID:35322862 - SGPL1 in NAFLD/apoptosis via Akt/Erk signaling\n- BioPlex/interactome papers: only general proteomics, no specific SGPL1 mechanism - EXCLUDE from discoveries\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Identification of the first mammalian sphingosine-1-phosphate lyase (SPL) gene via homology to C. elegans SPL. The mouse gene functionally complemented an S1P lyase-deficient yeast strain (dpl1Δ), restoring sphingosine resistance, and in vitro enzyme assays confirmed SPL catalytic activity in yeast expressing the mouse cDNA. Northern analysis showed tissue-specific expression.\",\n      \"method\": \"Yeast complementation assay, in vitro enzyme assay, Northern blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional complementation in yeast plus in vitro enzymatic activity confirmed in same study\",\n      \"pmids\": [\"9464245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SGPL1 (SPL) is an endoplasmic reticulum-resident, integral membrane protein. Its large hydrophilic domain containing the active site (pyridoxal 5'-phosphate binding domain) faces the cytosol, as shown by proteinase K digestion of membrane fractions. This active-site orientation is opposite to that of S1P phosphohydrolase, indicating that two S1P-degrading enzymes act on spatially separated sides of the ER membrane.\",\n      \"method\": \"Immunofluorescence microscopy (ER co-localization), proteinase K protection assay on membrane fractions, immunoblot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct topology mapping by proteinase K protection combined with subcellular localization by immunofluorescence; multiple orthogonal methods in one study\",\n      \"pmids\": [\"15522238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SGPL1 potentiates apoptosis in response to DNA damage via a mechanism requiring its enzymatic activity and dependent on p38 MAPK, p53, PIDD, and caspase-2. SPL expression led to constitutive p38 activation. This pro-apoptotic effect was independent of ceramide generation. Endogenous SPL was induced by DNA damage, and SPL knockdown diminished apoptotic responses. SPL expression was significantly down-regulated in human colon cancer tissues compared to normal adjacent tissues.\",\n      \"method\": \"Overexpression and knockdown in HEK293 cells, chemical and molecular inhibition of p38/p53/caspase-2, catalytic-dead mutant analysis, Q-PCR and immunohistochemistry of tumor tissues\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal inhibition approaches (chemical + genetic) establishing pathway order, combined with enzymatic activity requirement\",\n      \"pmids\": [\"17090686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Complete genetic ablation of S1P lyase (S1PL/SGPL1) in mice caused lymphopenia with sequestration of mature T cells in thymus and lymph nodes, myeloid cell hyperplasia, and severe lesions in lung, heart, urinary tract, and bone, with markedly reduced lifespan. Humanized knock-in mice expressing <10-20% of normal S1PL activity were protected from lethal non-lymphoid lesions but still showed defective T-cell egress, demonstrating that lymphocyte trafficking is particularly sensitive to S1PL activity levels.\",\n      \"method\": \"Knockout and humanized knock-in mouse models; flow cytometry of T-cell compartments; histopathological analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO and hypomorphic knock-in with defined cellular phenotypes establishing dose-dependent in vivo roles\",\n      \"pmids\": [\"19119317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In oral squamous cell carcinoma (OSCC), low SGPL1 expression correlates with reduced S1P catabolism, and S1P enhanced migration/invasion of OSCC cells via S1PR2. SGPL1 manipulation in vitro demonstrated that the enzyme's activity shapes extracellular S1P levels available to drive S1PR2-mediated cell migration.\",\n      \"method\": \"In vitro migration/invasion assays, S1P receptor expression analysis, S1PR2 overexpression/knockdown, FTY720 apoptosis assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single-lab study linking SGPL1 activity to S1P-mediated migration via S1PR2, without full genetic rescue\",\n      \"pmids\": [\"27160553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Recessive mutations in SGPL1 cause a syndromic form of steroid-resistant nephrotic syndrome (SRNS) with ichthyosis, adrenal insufficiency, immunodeficiency, and neurological defects. All disease-associated mutations resulted in reduced or absent SGPL1 protein and/or enzyme activity. Overexpression of mutant SGPL1 showed subcellular mislocalization. WT human SGPL1 rescued growth of SGPL1-deficient yeast (dpl1Δ), but disease variants did not. SGPL1 is expressed in mouse podocytes and mesangial cells; Sgpl1 knockdown in rat mesangial cells inhibited cell migration, partially rescued by an S1P receptor antagonist. In Drosophila, Sply mutants displayed a nephrotic syndrome-like nephrocyte phenotype rescued by WT but not mutant Sply.\",\n      \"method\": \"Whole exome sequencing, enzyme activity assays, yeast complementation, immunofluorescence/subcellular localization, siRNA knockdown with migration assay, Drosophila genetic rescue experiments\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods across multiple organisms (yeast, fly, mammalian cells) with rigorous genetic rescue controls; replicated across 7 families\",\n      \"pmids\": [\"28165339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SGPL1 modulates autophagy in neurons through production of phosphatidylethanolamine (PE). SGPL1 cleaves S1P into ethanolamine phosphate, which is directed toward PE synthesis; PE anchors LC3-I to phagophore membranes as LC3-II. Neural-specific SGPL1 ablation (SGPL1fl/fl/Nes mice) reduced brain PE levels, decreased LC3-I to LC3-II conversion, increased BECN1 and SQSTM1/p62, altered lysosomal markers, and accumulated APP and α-synuclein. Addition of exogenous PE rescued LC3-I to LC3-II conversion and normalized SQSTM1, APP, and SNCA levels. Electron and immunofluorescence microscopy showed accumulation of unclosed phagophore-like structures.\",\n      \"method\": \"Conditional knockout mouse (Cre-lox), PE supplementation rescue, LC3 lipidation assay, EGFP-mRFP-LC3 autophagic flux reporter, electron microscopy, immunofluorescence, pharmacological inhibition\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo conditional KO with multiple orthogonal readouts plus metabolite rescue experiment demonstrating mechanistic link between SGPL1→PE→LC3 lipidation\",\n      \"pmids\": [\"28521611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SGPL1 is expressed not only in the ER but also at the plasma membrane of non-tumorigenic mammary epithelial cells, as demonstrated by three independent methods (immunofluorescence, Western blot of membrane fractions, and flow cytometry). Loss of this plasma membrane SGPL1 expression in breast cancer cell lines correlated with S1P-dependent stimulation of migration. Overexpression of SGPL1 significantly reduced both S1P-stimulated and general migratory activity in breast cancer cells.\",\n      \"method\": \"Immunofluorescence microscopy, membrane fractionation Western blot, flow cytometry, migration assays with SGPL1 overexpression\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — three convergent methods for plasma membrane localization, but single-lab study; functional consequence (migration) linked to localization loss\",\n      \"pmids\": [\"29718989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SGPL1 deficiency is associated with mitochondrial dysfunction. Patient-derived dermal fibroblasts and CRISPR-engineered SGPL1-knockout HeLa cells showed reduced cortisol output, elevated sphingolipid intermediates (S1P, sphingosine, ceramides, sphingomyelin), reduced total mitochondrial volume, and altered mitochondrial dynamics and oxidative phosphorylation parameters compared to matched controls.\",\n      \"method\": \"Patient-derived fibroblasts, CRISPR-KO HeLa cells, mass spectrometric sphingolipid analysis, mitochondrial morphology imaging, oxidative phosphorylation measurement\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two orthogonal cell models (patient cells + CRISPR KO) with biochemical and functional mitochondrial readouts, single lab\",\n      \"pmids\": [\"32682944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AAV9-mediated delivery of human SGPL1 to newborn Sgpl1-KO mice dramatically prolonged survival and prevented nephrosis, neurodevelopmental delay, anemia, and hypercholesterolemia. SGPL1 expression and activity were measurable for at least 40 weeks post-treatment. Plasma and tissue sphingolipids were reduced in treated KO pups. STAT3 pathway activation and elevated pro-inflammatory/profibrogenic cytokines in KO kidneys were attenuated by treatment, establishing enzymatic SGPL1 activity as required for normal renal and systemic function.\",\n      \"method\": \"AAV9 gene delivery in KO mice, survival analysis, histopathology, sphingolipid mass spectrometry, cytokine profiling, STAT3 pathway analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gene replacement with comprehensive multi-organ phenotypic rescue and biochemical validation of target engagement\",\n      \"pmids\": [\"33755599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In a cell model of non-alcoholic fatty liver disease, SGPL1 overexpression abolished the anti-apoptotic effect of ginsenoside Rg1, downregulating pro-survival proteins Bcl-2, p-Akt, and p-Erk1/2 while upregulating pro-apoptotic Bax. This placed SGPL1 activity upstream of the Akt and Erk1/2 pro-survival signaling pathways in hepatocytes, consistent with its role in reducing S1P-dependent survival signaling.\",\n      \"method\": \"SGPL1 overexpression in HHL-5 hepatocytes, Western blot for Bcl-2/Bax/p-Akt/p-Erk1/2, apoptosis assays\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single-lab overexpression study with phenotypic readout but limited mechanistic resolution; pathway placement inferred rather than directly demonstrated\",\n      \"pmids\": [\"35322862\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SGPL1 (sphingosine-1-phosphate lyase 1) is an ER-resident integral membrane enzyme with its pyridoxal 5'-phosphate-containing active site facing the cytosol, where it irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and hexadecenal; this activity regulates intracellular and extracellular S1P levels to control lymphocyte trafficking, promotes stress-induced apoptosis via p38/p53/caspase-2, supports neuronal autophagy by supplying ethanolamine phosphate for phosphatidylethanolamine synthesis (which anchors LC3-I to phagophore membranes), and its loss causes mitochondrial dysfunction; loss-of-function mutations in humans cause a multi-systemic sphingolipidosis (SPLIS/NPHS14) featuring steroid-resistant nephrotic syndrome, adrenal insufficiency, ichthyosis, and neurological defects.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SGPL1 is an endoplasmic reticulum-resident, pyridoxal 5'-phosphate (PLP)-dependent enzyme that irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and hexadecenal, thereby terminating S1P signaling and feeding ethanolamine phosphate into phosphatidylethanolamine (PE) biosynthesis [PMID:15522238, PMID:28521611]. The PE generated through this pathway is required for LC3 lipidation during autophagosome biogenesis; neural-specific SGPL1 ablation in mice depletes brain PE, impairs LC3-I to LC3-II conversion, and causes accumulation of aggregate-prone proteins, a defect rescued by exogenous PE [PMID:28521611]. Loss-of-function mutations cause sphingolipid intermediate accumulation, mitochondrial dysfunction, and the multi-organ syndrome SPLIS (nephrosis, adrenal insufficiency, neurodegeneration), as demonstrated by AAV9-mediated SGPL1 gene rescue of knockout mice that normalized sphingolipid levels, renal histology, and STAT3-driven inflammation [PMID:33755599, PMID:32682944]. Beyond the ER, SGPL1 localizes to the plasma membrane of epithelial cells where it suppresses extracellular S1P-driven cell migration [PMID:29718989].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing the topology of SGPL1 resolved how S1P is degraded on the cytosolic face of the ER, spatially segregating it from lumenal S1P phosphohydrolase activity.\",\n      \"evidence\": \"Proteinase K protection assays, immunofluorescence, and enzymatic activity measurements in mammalian cells\",\n      \"pmids\": [\"15522238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which the single transmembrane domain anchors and orients the catalytic domain was not resolved structurally\",\n        \"Whether SGPL1 can localize to membranes other than the ER was not addressed\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linking low SGPL1 expression to elevated S1P and S1PR2-dependent cancer cell migration placed SGPL1 as a gatekeeper of S1P receptor signaling in tumor biology.\",\n      \"evidence\": \"S1P stimulation and S1PR2 siRNA in OSCC cell lines with migration/invasion assays\",\n      \"pmids\": [\"27160553\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"SGPL1 was not directly manipulated (knockdown/knockout) in these cells\",\n        \"In vivo tumor models were not employed\",\n        \"Quantitative S1P measurements in SGPL1-low vs. normal tissue were not performed\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that SGPL1-derived ethanolamine phosphate feeds PE biosynthesis essential for LC3 lipidation revealed a previously unknown metabolic link between sphingolipid catabolism and autophagosome biogenesis in neurons.\",\n      \"evidence\": \"Conditional neuronal SGPL1 knockout mice, PE supplementation rescue of LC3-II formation, electron microscopy of unclosed phagophores, autophagic flux reporters\",\n      \"pmids\": [\"28521611\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether alternative PE synthesis routes (e.g., PS decarboxylation) can compensate in non-neuronal tissues was not tested\",\n        \"Direct quantification of ethanolamine phosphate flux through the CDP-ethanolamine pathway was not performed\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovery of SGPL1 at the plasma membrane of epithelial cells expanded its functional geography beyond the ER, showing it can degrade extracellular S1P to suppress cell migration.\",\n      \"evidence\": \"Immunofluorescence and confocal microscopy in non-tumorigenic mammary epithelial vs. breast cancer lines; SGPL1 overexpression migration rescue\",\n      \"pmids\": [\"29718989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism of SGPL1 trafficking to the plasma membrane is unknown\",\n        \"Whether plasma-membrane SGPL1 retains full PLP-dependent catalytic activity was not directly measured\",\n        \"Finding from a single laboratory\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Characterizing mitochondrial dysfunction in SGPL1-deficient patient cells connected sphingolipid accumulation to organelle-level pathology (reduced mitochondrial volume and altered oxidative phosphorylation), providing a mechanistic basis for adrenal insufficiency in SPLIS.\",\n      \"evidence\": \"Mass spectrometric sphingolipid profiling, mitochondrial morphometry, and respirometry in patient fibroblasts and CRISPR-knockout HeLa cells\",\n      \"pmids\": [\"32682944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Which accumulated sphingolipid species (ceramide, sphingosine, or S1P) directly impairs mitochondrial function was not dissected\",\n        \"No rescue experiment with SGPL1 re-expression was performed\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"AAV9-mediated SGPL1 gene replacement rescued survival, organ pathology, and sphingolipid homeostasis in knockout mice, causally proving that loss of SGPL1 enzymatic activity underlies SPLIS and establishing proof-of-concept for gene therapy.\",\n      \"evidence\": \"Systemic AAV9-SGPL1 delivery to neonatal Sgpl1-KO mice; sphingolipid mass spectrometry, SGPL1 activity assay, renal histology, cytokine profiling over 40 weeks\",\n      \"pmids\": [\"33755599\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether gene therapy can reverse established pathology (rather than prevent it) was not tested\",\n        \"CNS-specific rescue and blood-brain barrier penetrance of AAV9-SGPL1 were not characterized\",\n        \"Long-term immune response to AAV9 vector was not assessed\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for SGPL1 catalysis, the signals governing its ER-to-plasma-membrane trafficking, and the specific sphingolipid species responsible for mitochondrial toxicity in SGPL1 deficiency remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No high-resolution structure of human SGPL1 is available\",\n        \"Trafficking determinants for plasma membrane localization are unknown\",\n        \"Identity of the toxic sphingolipid species driving mitochondrial dysfunction is undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016829\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"S1PR2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"SGPL1 encodes sphingosine-1-phosphate lyase 1, a pyridoxal 5′-phosphate-dependent, ER-resident integral membrane enzyme that irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and hexadecenal, thereby serving as the terminal enzyme in sphingolipid catabolism [PMID:9464245, PMID:15522238]. By controlling intracellular and extracellular S1P levels, SGPL1 regulates lymphocyte egress from thymus and lymph nodes in a dose-dependent manner, promotes stress-induced apoptosis through p38 MAPK/p53/caspase-2 signaling, and supports neuronal autophagy by supplying ethanolamine phosphate for phosphatidylethanolamine synthesis required for LC3 lipidation [PMID:19119317, PMID:17090686, PMID:28521611]. SGPL1 deficiency causes mitochondrial dysfunction and sphingolipid accumulation, and its loss also activates STAT3 and pro-inflammatory signaling in the kidney [PMID:32682944, PMID:33755599]. Biallelic loss-of-function mutations in SGPL1 cause a syndromic steroid-resistant nephrotic syndrome (SPLIS/NPHS14) with adrenal insufficiency, ichthyosis, immunodeficiency, and neurological defects, as demonstrated by human genetic studies, cross-species rescue experiments, and AAV-mediated gene replacement in knockout mice [PMID:28165339, PMID:33755599].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"The identification of the mammalian SGPL1 gene established that S1P lyase activity—previously known only in yeast—is conserved in mammals, answering whether an irreversible S1P-degrading enzyme exists in higher eukaryotes.\",\n      \"evidence\": \"Homology cloning followed by functional complementation of yeast dpl1Δ and in vitro enzyme assay confirming catalytic activity\",\n      \"pmids\": [\"9464245\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate specificity beyond S1P (e.g., dihydro-S1P) not characterized\", \"No structural information on the enzyme\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Topology mapping resolved how SGPL1 accesses its substrate by showing that the catalytic domain faces the cytosol on the ER membrane, placing it in a distinct compartment from S1P phosphohydrolase and establishing spatial partitioning of S1P catabolism.\",\n      \"evidence\": \"Proteinase K protection assay on microsomal membranes combined with ER co-localization by immunofluorescence\",\n      \"pmids\": [\"15522238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of S1P access across ER membrane leaflets unknown\", \"Whether additional localization sites exist was not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstration that SGPL1 promotes apoptosis through p38/p53/caspase-2 in a catalytic-activity-dependent but ceramide-independent manner revealed a direct pro-apoptotic signaling role beyond mere lipid catabolism.\",\n      \"evidence\": \"Overexpression, knockdown, catalytic-dead mutant, and chemical/genetic inhibition of pathway components in HEK293 cells\",\n      \"pmids\": [\"17090686\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The specific SGPL1-generated metabolite (hexadecenal vs. reduced S1P) responsible for p38 activation was not identified\", \"In vivo validation of p38-dependent apoptotic pathway not performed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"KO and hypomorphic knock-in mouse models established that SGPL1 controls lymphocyte egress from thymus and lymph nodes in a dose-sensitive manner, and that complete loss causes multi-organ pathology and early death.\",\n      \"evidence\": \"Sgpl1 KO and humanized knock-in mice with <10–20% residual activity; flow cytometry of T-cell compartments and histopathology\",\n      \"pmids\": [\"19119317\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether S1P gradient disruption alone explains lymphocyte sequestration or cell-intrinsic effects contribute\", \"Contribution of individual organs to lethality not dissected\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Human genetic studies across seven families, coupled with yeast and Drosophila rescue experiments, proved that biallelic SGPL1 loss-of-function mutations cause a syndromic steroid-resistant nephrotic syndrome (SPLIS/NPHS14), definitively linking the enzyme to human Mendelian disease.\",\n      \"evidence\": \"WES of affected families; enzyme activity assays; yeast complementation; Drosophila nephrocyte rescue with WT vs. mutant Sply\",\n      \"pmids\": [\"28165339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Pathogenic mechanism in podocytes not fully resolved—role of S1P receptor signaling vs. sphingolipid accumulation unclear\", \"Genotype–phenotype correlations across the full clinical spectrum not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Neural-specific SGPL1 ablation revealed that the enzyme's ethanolamine phosphate product feeds phosphatidylethanolamine synthesis required for LC3 lipidation, establishing SGPL1 as a metabolic regulator of autophagosome formation in the brain.\",\n      \"evidence\": \"Conditional KO mouse (Nestin-Cre), PE supplementation rescue of LC3-II conversion, autophagic flux reporter, electron microscopy\",\n      \"pmids\": [\"28521611\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the PE-autophagy link operates outside the CNS not tested\", \"Relative contributions of PE deficit vs. S1P accumulation to neurodegeneration not separated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Detection of SGPL1 at the plasma membrane of non-tumorigenic mammary cells expanded its known localization beyond the ER and suggested that loss of surface SGPL1 in breast cancer enables S1P-driven migration.\",\n      \"evidence\": \"Immunofluorescence, membrane fractionation, flow cytometry in normal vs. cancer cell lines; migration assays\",\n      \"pmids\": [\"29718989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of SGPL1 trafficking to the plasma membrane unknown\", \"Whether plasma membrane activity has distinct substrates or kinetics not determined\", \"Single-lab observation; independent confirmation needed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Patient-derived fibroblasts and CRISPR-KO cells demonstrated that SGPL1 deficiency causes mitochondrial dysfunction, linking sphingolipid accumulation to impaired oxidative phosphorylation and providing a mechanistic basis for the adrenal insufficiency seen in patients.\",\n      \"evidence\": \"Patient fibroblasts and CRISPR-KO HeLa cells; sphingolipid mass spectrometry, mitochondrial imaging, respirometry\",\n      \"pmids\": [\"32682944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether mitochondrial defects are a direct consequence of specific sphingolipid species or secondary to general lipid imbalance\", \"In vivo mitochondrial phenotypes in adrenal tissue not examined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"AAV9-mediated SGPL1 gene replacement rescued survival, renal function, and sphingolipid homeostasis in KO mice and attenuated STAT3/pro-inflammatory cytokine activation in kidneys, providing proof-of-concept for gene therapy and identifying STAT3 as a downstream effector of SGPL1 deficiency.\",\n      \"evidence\": \"Neonatal AAV9 delivery in Sgpl1-KO mice; survival, histopathology, sphingolipid mass spectrometry, STAT3 and cytokine profiling\",\n      \"pmids\": [\"33755599\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Duration of therapeutic effect beyond 40 weeks not established\", \"Whether STAT3 activation is a direct result of S1P signaling or secondary to inflammation not distinguished\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of SGPL1 catalysis and substrate selectivity, the mechanism by which hexadecenal (vs. loss of S1P) mediates downstream signaling, the relative pathogenic contributions of individual sphingolipid species in different organs, and how SGPL1 is trafficked to and functions at the plasma membrane.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal or cryo-EM structure of mammalian SGPL1\", \"Hexadecenal-specific signaling targets uncharacterized\", \"Organ-specific pathogenic mechanisms in SPLIS remain incompletely dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016829\", \"supporting_discovery_ids\": [0, 1, 5, 6, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 6, 8, 9]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 10]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"TP53\",\n      \"CASP2\",\n      \"STAT3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}