{"gene":"SGPL1","run_date":"2026-06-10T07:46:31","timeline":{"discoveries":[{"year":2017,"finding":"SGPL1 cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate, which is directed toward phosphatidylethanolamine (PE) synthesis; PE anchors LC3-I to phagophore membranes as LC3-II, thereby supporting autophagy initiation in neurons. Neural-specific SGPL1 ablation reduced brain PE levels, decreased LC3-I→LC3-II conversion, increased BECN1/p62, accumulated unclosed phagophore-like structures, and impaired autophagic flux; addition of exogenous PE was sufficient to restore LC3-I→LC3-II conversion and normalize SQSTM1/APP/SNCA levels.","method":"Conditional neural knockout mouse (SGPL1fl/fl/Nes), pharmacological/genetic inhibition in cultured neurons, lipidomics (PE measurement), immunofluorescence and electron microscopy, EGFP-mRFP-LC3 flux reporter, PE rescue experiments","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KO mouse, pharmacological inhibition, lipid rescue, LC3 flux reporter, EM) converging on same mechanism in one rigorous study","pmids":["28521611"],"is_preprint":false},{"year":2021,"finding":"Sgpl1 deletion in mice causes S1P accumulation in gonads. In the ovary, elevated S1P decreases natriuretic peptide receptor 2 (NPR2) activity in granulosa cells and inhibits early follicle growth. In the testis, elevated S1P increases p21 (cyclin-dependent kinase inhibitor 1A) levels and apoptosis in Leydig cells, resulting in spermatogenesis arrest. Thus SGPL1-mediated S1P degradation is required for germ cell development via distinct downstream pathways in each gonad.","method":"Sgpl1-knockout mice, gonadal S1P quantification, NPR2 activity assay in granulosa cells, p21 and apoptosis measurements in Leydig cells","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with multiple tissue-specific readouts in one study, single lab","pmids":["34083520"],"is_preprint":false},{"year":2021,"finding":"AAV9-mediated delivery of human SGPL1 to newborn Sgpl1-KO mice restored SGPL1 expression and enzymatic activity, reduced plasma and tissue sphingolipid levels (S1P, sphingosine, ceramide), prevented nephrosis, neurodevelopmental delay, anemia, and hypercholesterolemia, and attenuated renal STAT3 pathway activation and pro-inflammatory/pro-fibrogenic cytokines, demonstrating that SGPL1 enzymatic activity is the root cause of the multi-systemic SPLIS phenotype.","method":"AAV9 gene transfer in Sgpl1-KO mouse model, survival analysis, sphingolipid mass spectrometry, histopathology, cytokine profiling, STAT3 pathway analysis","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo reconstitution of enzymatic function via gene replacement with multiple orthogonal biochemical and phenotypic readouts","pmids":["33755599"],"is_preprint":false},{"year":2020,"finding":"SGPL1 deficiency (patient-derived fibroblasts and CRISPR-engineered SGPL1-KO HeLa cells) is associated with accumulation of S1P, sphingosine, ceramide, and sphingomyelin, reduced total mitochondrial volume, and altered mitochondrial dynamics and oxidative phosphorylation parameters, indicating that S1P lyase activity is required for normal mitochondrial morphology and function.","method":"Patient-derived dermal fibroblasts, CRISPR-KO HeLa cells, mass spectrometry for sphingolipids, mitochondrial morphology imaging, oxidative phosphorylation assays, cortisol output assay","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent cellular models with orthogonal methods (lipidomics + mitochondrial functional assays), single lab","pmids":["32682944"],"is_preprint":false},{"year":2018,"finding":"SGPL1 protein is expressed not only in the endoplasmic reticulum/cytoplasm but also at the plasma membrane of non-tumorigenic mammary epithelial cells. Loss of this plasma membrane localization in breast cancer cell lines (MCF-7, BT-20) coincides with reduced SGPL1 expression and enhanced S1P-dependent cell migration. Overexpression of the natural SGPL1 variant suppressed both S1P-stimulated and general migratory activity, functionally linking plasma membrane SGPL1 to extracellular S1P degradation and migration control.","method":"Immunofluorescence, subcellular fractionation, Western blot, migration/invasion assays, SGPL1 overexpression in breast cancer cell lines","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — novel localization finding validated by three independent methods, functional consequence shown by overexpression, single lab","pmids":["29718989"],"is_preprint":false},{"year":2016,"finding":"In oral squamous cell carcinoma (OSCC) cells, S1P signaling (regulated by SPHK1 and SGPL1) promotes cell migration/invasion and attenuates cisplatin-induced death. S1P-induced migration of OSCC cells is mediated in part through S1PR2 overexpression. FTY720, which depletes functional S1P receptors, induced apoptosis in OSCC cells and synergized with cisplatin, placing SGPL1-regulated S1P levels upstream of S1PR2-driven migration.","method":"In vitro migration/invasion assays, siRNA knockdown, S1PR2 overexpression, apoptosis assays, drug combination studies in OSCC cell lines","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, functional cell assays without direct SGPL1 enzymatic characterization; SGPL1 role inferred from expression and S1P signaling context","pmids":["27160553"],"is_preprint":false},{"year":2022,"finding":"SGPL1 overexpression in steatotic HHL-5 hepatocytes abolished the anti-apoptotic effect of ginsenoside Rg1, downregulated Bcl-2, p-Akt, and p-Erk1/2, and upregulated Bax, demonstrating that SGPL1 activity suppresses pro-survival signaling (Akt and Erk1/2 pathways) in fatty liver cells, likely through S1P degradation.","method":"SGPL1 overexpression in HHL-5 hepatocytes, apoptosis assays, Western blot for Bcl-2/Bax/p-Akt/p-Erk1/2, lipid accumulation assays","journal":"Molecular medicine reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single cell model, pathway placement inferred rather than directly tested","pmids":["35322862"],"is_preprint":false},{"year":2017,"finding":"Genistein + calcitriol combination treatment of MG-63 osteosarcoma cells upregulated SGPL1 expression by ~350%, leading to increased ethanolamine metabolite levels (consistent with S1P cleavage) and suppression of cancer cell migration, linking SGPL1 enzymatic activity to anti-metastatic effects via S1P degradation.","method":"GC/MS metabolomics, qPCR, Western blot for SGPL1, cell proliferation and migration assays in osteosarcoma cell lines","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, correlative metabolomics + expression; no direct enzymatic assay or SGPL1-specific KO/KD","pmids":["28125641"],"is_preprint":false}],"current_model":"SGPL1 (sphingosine-1-phosphate lyase 1) is an intracellular enzyme that irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and hexadecenal, thereby terminating S1P signaling; the ethanolamine phosphate product feeds into phosphatidylethanolamine (PE) synthesis required for autophagosome membrane lipidation (LC3-I→LC3-II conversion), SGPL1-generated PE also supports neuronal autophagy, and loss of SGPL1 activity causes multi-systemic disease (SPLIS) through S1P accumulation that disrupts mitochondrial function, germ cell development (via NPR2 and p21 pathways), and renal/endocrine homeostasis."},"narrative":{"mechanistic_narrative":"SGPL1 is the intracellular lyase that irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and a long-chain aldehyde, an activity that simultaneously terminates S1P signaling and channels the ethanolamine phosphate product into phosphatidylethanolamine (PE) synthesis [PMID:28521611]. In neurons, this SGPL1-derived PE is required for autophagy: neural-specific ablation lowers brain PE, impairs LC3-I→LC3-II conversion, accumulates unclosed phagophore-like structures and SQSTM1/BECN1, and blocks autophagic flux, defects rescued by exogenous PE [PMID:28521611]. The degradative arm of this enzyme controls S1P abundance across multiple tissues, and its loss produces a multi-systemic disease (SPLIS): AAV9 delivery of human SGPL1 to Sgpl1-knockout mice restores enzymatic activity, normalizes S1P/sphingosine/ceramide, and prevents nephrosis, neurodevelopmental delay, anemia and hypercholesterolemia, establishing that enzymatic deficiency is the root cause [PMID:33755599]. S1P accumulation upon SGPL1 loss disrupts mitochondrial morphology and oxidative phosphorylation [PMID:32682944] and impairs gonadal germ-cell development through distinct downstream effectors—reduced NPR2 activity in ovarian granulosa cells and elevated p21-driven Leydig-cell apoptosis in the testis [PMID:34083520]. SGPL1 also localizes to the plasma membrane of mammary epithelial cells, where it degrades extracellular S1P and restrains S1P-dependent cell migration [PMID:29718989].","teleology":[{"year":2017,"claim":"Established that SGPL1's cleavage of S1P does more than terminate signaling—its ethanolamine phosphate product feeds PE synthesis required for autophagosome membrane lipidation in neurons, linking sphingolipid catabolism to autophagy.","evidence":"Conditional neural knockout mouse, LC3 flux reporter, lipidomics, EM, and PE rescue in cultured neurons","pmids":["28521611"],"confidence":"High","gaps":["Does not establish whether peripheral tissues use the same PE-dependent autophagy link","Mechanism connecting ethanolamine phosphate to specific PE pools at the phagophore not resolved"]},{"year":2020,"claim":"Showed that SGPL1 activity is required for normal mitochondrial morphology and respiration, identifying a mitochondrial dimension to the cellular consequences of S1P/sphingolipid accumulation.","evidence":"Patient-derived fibroblasts and CRISPR-KO HeLa cells with sphingolipid mass spectrometry and mitochondrial functional assays","pmids":["32682944"],"confidence":"Medium","gaps":["Direct molecular link between accumulated S1P and mitochondrial dysfunction not defined","Single lab; two cellular models only"]},{"year":2021,"claim":"Demonstrated in vivo that restoring SGPL1 enzymatic activity reverses the multi-systemic SPLIS phenotype, proving enzyme deficiency is causal rather than correlative.","evidence":"AAV9 gene transfer in Sgpl1-KO mice with survival, sphingolipid MS, histopathology, and STAT3/cytokine analysis","pmids":["33755599"],"confidence":"High","gaps":["Tissue-specific contributions to each phenotype not dissected","Mechanism of renal STAT3 activation downstream of S1P not resolved"]},{"year":2021,"claim":"Resolved how S1P accumulation impairs reproduction, showing tissue-divergent downstream effectors (NPR2 in ovary, p21/apoptosis in testis) rather than a single shared pathway.","evidence":"Sgpl1-KO mice with gonadal S1P quantification, granulosa NPR2 activity assay, and Leydig-cell p21/apoptosis measurements","pmids":["34083520"],"confidence":"Medium","gaps":["How S1P modulates NPR2 activity mechanistically is unknown","Single lab; receptor mediating S1P effects on each cell type not identified"]},{"year":2018,"claim":"Extended SGPL1 localization beyond the ER/cytoplasm to the plasma membrane, where it degrades extracellular S1P and restrains migration—implicating its loss in cancer cell motility.","evidence":"Immunofluorescence, subcellular fractionation, Western blot, and overexpression migration assays in mammary epithelial and breast cancer lines","pmids":["29718989"],"confidence":"Medium","gaps":["Mechanism targeting SGPL1 to the plasma membrane unknown","Whether plasma-membrane SGPL1 acts on extracellular vs. intracellular S1P pools not definitively separated"]},{"year":null,"claim":"How SGPL1-regulated S1P levels intersect with specific S1P receptors and pro-survival kinase signaling (Akt/Erk) across tissues remains to be defined mechanistically.","evidence":"","pmids":[],"confidence":"Low","gaps":["Direct enzymatic characterization absent in tumor-context studies","Receptor- and kinase-level coupling inferred from expression/pathway readouts rather than direct tests"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016829","term_label":"lyase activity","supporting_discovery_ids":[0,2]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,2,3]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0]}],"complexes":[],"partners":[],"other_free_text":[]}},"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 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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":"25617719","id":"PMC_25617719","title":"The 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Neural-specific SGPL1 ablation reduced brain PE levels, decreased LC3-I→LC3-II conversion, increased BECN1/p62, accumulated unclosed phagophore-like structures, and impaired autophagic flux; addition of exogenous PE was sufficient to restore LC3-I→LC3-II conversion and normalize SQSTM1/APP/SNCA levels.\",\n      \"method\": \"Conditional neural knockout mouse (SGPL1fl/fl/Nes), pharmacological/genetic inhibition in cultured neurons, lipidomics (PE measurement), immunofluorescence and electron microscopy, EGFP-mRFP-LC3 flux reporter, PE rescue experiments\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KO mouse, pharmacological inhibition, lipid rescue, LC3 flux reporter, EM) converging on same mechanism in one rigorous study\",\n      \"pmids\": [\"28521611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Sgpl1 deletion in mice causes S1P accumulation in gonads. In the ovary, elevated S1P decreases natriuretic peptide receptor 2 (NPR2) activity in granulosa cells and inhibits early follicle growth. In the testis, elevated S1P increases p21 (cyclin-dependent kinase inhibitor 1A) levels and apoptosis in Leydig cells, resulting in spermatogenesis arrest. Thus SGPL1-mediated S1P degradation is required for germ cell development via distinct downstream pathways in each gonad.\",\n      \"method\": \"Sgpl1-knockout mice, gonadal S1P quantification, NPR2 activity assay in granulosa cells, p21 and apoptosis measurements in Leydig cells\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with multiple tissue-specific readouts in one study, single lab\",\n      \"pmids\": [\"34083520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AAV9-mediated delivery of human SGPL1 to newborn Sgpl1-KO mice restored SGPL1 expression and enzymatic activity, reduced plasma and tissue sphingolipid levels (S1P, sphingosine, ceramide), prevented nephrosis, neurodevelopmental delay, anemia, and hypercholesterolemia, and attenuated renal STAT3 pathway activation and pro-inflammatory/pro-fibrogenic cytokines, demonstrating that SGPL1 enzymatic activity is the root cause of the multi-systemic SPLIS phenotype.\",\n      \"method\": \"AAV9 gene transfer in Sgpl1-KO mouse model, survival analysis, sphingolipid mass spectrometry, histopathology, cytokine profiling, STAT3 pathway analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo reconstitution of enzymatic function via gene replacement with multiple orthogonal biochemical and phenotypic readouts\",\n      \"pmids\": [\"33755599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SGPL1 deficiency (patient-derived fibroblasts and CRISPR-engineered SGPL1-KO HeLa cells) is associated with accumulation of S1P, sphingosine, ceramide, and sphingomyelin, reduced total mitochondrial volume, and altered mitochondrial dynamics and oxidative phosphorylation parameters, indicating that S1P lyase activity is required for normal mitochondrial morphology and function.\",\n      \"method\": \"Patient-derived dermal fibroblasts, CRISPR-KO HeLa cells, mass spectrometry for sphingolipids, mitochondrial morphology imaging, oxidative phosphorylation assays, cortisol output assay\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent cellular models with orthogonal methods (lipidomics + mitochondrial functional assays), single lab\",\n      \"pmids\": [\"32682944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SGPL1 protein is expressed not only in the endoplasmic reticulum/cytoplasm but also at the plasma membrane of non-tumorigenic mammary epithelial cells. Loss of this plasma membrane localization in breast cancer cell lines (MCF-7, BT-20) coincides with reduced SGPL1 expression and enhanced S1P-dependent cell migration. Overexpression of the natural SGPL1 variant suppressed both S1P-stimulated and general migratory activity, functionally linking plasma membrane SGPL1 to extracellular S1P degradation and migration control.\",\n      \"method\": \"Immunofluorescence, subcellular fractionation, Western blot, migration/invasion assays, SGPL1 overexpression in breast cancer cell lines\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — novel localization finding validated by three independent methods, functional consequence shown by overexpression, single lab\",\n      \"pmids\": [\"29718989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In oral squamous cell carcinoma (OSCC) cells, S1P signaling (regulated by SPHK1 and SGPL1) promotes cell migration/invasion and attenuates cisplatin-induced death. S1P-induced migration of OSCC cells is mediated in part through S1PR2 overexpression. FTY720, which depletes functional S1P receptors, induced apoptosis in OSCC cells and synergized with cisplatin, placing SGPL1-regulated S1P levels upstream of S1PR2-driven migration.\",\n      \"method\": \"In vitro migration/invasion assays, siRNA knockdown, S1PR2 overexpression, apoptosis assays, drug combination studies in OSCC cell lines\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, functional cell assays without direct SGPL1 enzymatic characterization; SGPL1 role inferred from expression and S1P signaling context\",\n      \"pmids\": [\"27160553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SGPL1 overexpression in steatotic HHL-5 hepatocytes abolished the anti-apoptotic effect of ginsenoside Rg1, downregulated Bcl-2, p-Akt, and p-Erk1/2, and upregulated Bax, demonstrating that SGPL1 activity suppresses pro-survival signaling (Akt and Erk1/2 pathways) in fatty liver cells, likely through S1P degradation.\",\n      \"method\": \"SGPL1 overexpression in HHL-5 hepatocytes, apoptosis assays, Western blot for Bcl-2/Bax/p-Akt/p-Erk1/2, lipid accumulation assays\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single cell model, pathway placement inferred rather than directly tested\",\n      \"pmids\": [\"35322862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Genistein + calcitriol combination treatment of MG-63 osteosarcoma cells upregulated SGPL1 expression by ~350%, leading to increased ethanolamine metabolite levels (consistent with S1P cleavage) and suppression of cancer cell migration, linking SGPL1 enzymatic activity to anti-metastatic effects via S1P degradation.\",\n      \"method\": \"GC/MS metabolomics, qPCR, Western blot for SGPL1, cell proliferation and migration assays in osteosarcoma cell lines\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, correlative metabolomics + expression; no direct enzymatic assay or SGPL1-specific KO/KD\",\n      \"pmids\": [\"28125641\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SGPL1 (sphingosine-1-phosphate lyase 1) is an intracellular enzyme that irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and hexadecenal, thereby terminating S1P signaling; the ethanolamine phosphate product feeds into phosphatidylethanolamine (PE) synthesis required for autophagosome membrane lipidation (LC3-I→LC3-II conversion), SGPL1-generated PE also supports neuronal autophagy, and loss of SGPL1 activity causes multi-systemic disease (SPLIS) through S1P accumulation that disrupts mitochondrial function, germ cell development (via NPR2 and p21 pathways), and renal/endocrine homeostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SGPL1 is the intracellular lyase that irreversibly cleaves sphingosine-1-phosphate (S1P) into ethanolamine phosphate and a long-chain aldehyde, an activity that simultaneously terminates S1P signaling and channels the ethanolamine phosphate product into phosphatidylethanolamine (PE) synthesis [#0]. In neurons, this SGPL1-derived PE is required for autophagy: neural-specific ablation lowers brain PE, impairs LC3-I\\u2192LC3-II conversion, accumulates unclosed phagophore-like structures and SQSTM1/BECN1, and blocks autophagic flux, defects rescued by exogenous PE [#0]. The degradative arm of this enzyme controls S1P abundance across multiple tissues, and its loss produces a multi-systemic disease (SPLIS): AAV9 delivery of human SGPL1 to Sgpl1-knockout mice restores enzymatic activity, normalizes S1P/sphingosine/ceramide, and prevents nephrosis, neurodevelopmental delay, anemia and hypercholesterolemia, establishing that enzymatic deficiency is the root cause [#2]. S1P accumulation upon SGPL1 loss disrupts mitochondrial morphology and oxidative phosphorylation [#3] and impairs gonadal germ-cell development through distinct downstream effectors\\u2014reduced NPR2 activity in ovarian granulosa cells and elevated p21-driven Leydig-cell apoptosis in the testis [#1]. SGPL1 also localizes to the plasma membrane of mammary epithelial cells, where it degrades extracellular S1P and restrains S1P-dependent cell migration [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 2017,\n      \"claim\": \"Established that SGPL1's cleavage of S1P does more than terminate signaling\\u2014its ethanolamine phosphate product feeds PE synthesis required for autophagosome membrane lipidation in neurons, linking sphingolipid catabolism to autophagy.\",\n      \"evidence\": \"Conditional neural knockout mouse, LC3 flux reporter, lipidomics, EM, and PE rescue in cultured neurons\",\n      \"pmids\": [\"28521611\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not establish whether peripheral tissues use the same PE-dependent autophagy link\", \"Mechanism connecting ethanolamine phosphate to specific PE pools at the phagophore not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed that SGPL1 activity is required for normal mitochondrial morphology and respiration, identifying a mitochondrial dimension to the cellular consequences of S1P/sphingolipid accumulation.\",\n      \"evidence\": \"Patient-derived fibroblasts and CRISPR-KO HeLa cells with sphingolipid mass spectrometry and mitochondrial functional assays\",\n      \"pmids\": [\"32682944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between accumulated S1P and mitochondrial dysfunction not defined\", \"Single lab; two cellular models only\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated in vivo that restoring SGPL1 enzymatic activity reverses the multi-systemic SPLIS phenotype, proving enzyme deficiency is causal rather than correlative.\",\n      \"evidence\": \"AAV9 gene transfer in Sgpl1-KO mice with survival, sphingolipid MS, histopathology, and STAT3/cytokine analysis\",\n      \"pmids\": [\"33755599\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific contributions to each phenotype not dissected\", \"Mechanism of renal STAT3 activation downstream of S1P not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved how S1P accumulation impairs reproduction, showing tissue-divergent downstream effectors (NPR2 in ovary, p21/apoptosis in testis) rather than a single shared pathway.\",\n      \"evidence\": \"Sgpl1-KO mice with gonadal S1P quantification, granulosa NPR2 activity assay, and Leydig-cell p21/apoptosis measurements\",\n      \"pmids\": [\"34083520\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How S1P modulates NPR2 activity mechanistically is unknown\", \"Single lab; receptor mediating S1P effects on each cell type not identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extended SGPL1 localization beyond the ER/cytoplasm to the plasma membrane, where it degrades extracellular S1P and restrains migration\\u2014implicating its loss in cancer cell motility.\",\n      \"evidence\": \"Immunofluorescence, subcellular fractionation, Western blot, and overexpression migration assays in mammary epithelial and breast cancer lines\",\n      \"pmids\": [\"29718989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism targeting SGPL1 to the plasma membrane unknown\", \"Whether plasma-membrane SGPL1 acts on extracellular vs. intracellular S1P pools not definitively separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SGPL1-regulated S1P levels intersect with specific S1P receptors and pro-survival kinase signaling (Akt/Erk) across tissues remains to be defined mechanistically.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Direct enzymatic characterization absent in tumor-context studies\", \"Receptor- and kinase-level coupling inferred from expression/pathway readouts rather than direct tests\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016829\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}