{"gene":"LIPG","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":2016,"finding":"LIPG (endothelial lipase) is transcriptionally controlled by FoxA1 or FoxA2 in breast cancer cells, and LIPG expression enables the import of extracellular lipid precursors that support intracellular lipid synthesis and breast cancer cell proliferation; knockdown of either LIPG or FoxA reduces proliferation and impairs intracellular lipid synthesis.","method":"siRNA knockdown, lipid metabolomics, proliferation assays, ChIP/reporter assays","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KD, metabolomics, functional rescue) in a single well-controlled study","pmids":["27045898"],"is_preprint":false},{"year":2018,"finding":"LIPG possesses a lipase-dependent function supporting cancer cell proliferation and a lipase-independent function promoting invasiveness and stemness in triple-negative breast cancer (TNBC). Mechanistically, DTX3L (an E3-ubiquitin ligase) stabilizes LIPG protein by inhibiting proteasome-mediated degradation, and LIPG participates in DTX3L-ISG15 signaling (ISGylation pathway) to drive TNBC malignancy.","method":"siRNA/shRNA knockdown, proteasome inhibitor assays, co-immunoprecipitation, lipase-dead mutant rescue experiments, in vivo tumorigenicity assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, enzymatic mutants, in vivo rescue, multiple orthogonal methods in one study","pmids":["29350614"],"is_preprint":false},{"year":2019,"finding":"Severe oxidative stress activates AMPK, which triggers LIPG upregulation in breast cancer cells, leading to intracellular lipid droplet accumulation that protects cells from oxidative stress-induced death; neutralizing oxidative stress abrogates both LIPG upregulation and the concomitant lipid storage.","method":"AMPK activation/inhibition, LIPG knockdown, lipid droplet staining, cell viability assays","journal":"International Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotype, but single lab","pmids":["30653260"],"is_preprint":false},{"year":2020,"finding":"LIPG expression is induced by the hepatic microenvironment in leukemia cells, stimulating tumor cell proliferation through polyunsaturated fatty acid (PUFA)-mediated pathways and promoting survival by stabilizing antiapoptotic proteins.","method":"Co-culture with liver stromal cells, LIPG knockdown/overexpression, lipidomics, apoptosis assays, in vivo leukemia models","journal":"Cancer Discovery","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo model with mechanistic follow-up, single lab","pmids":["33028621"],"is_preprint":false},{"year":2020,"finding":"LIPG functions as a cell-surface phospholipase A1 active toward phosphatidylcholine in HDL; its phospholipase catalytic activity is required for LIPG-mediated support of TNBC cell proliferation and tumor formation, as demonstrated by the specific phospholipase inhibitor XEN445 selectively suppressing LIPG-expressing TNBC cell growth and cancer stem cell self-renewal in vitro and tumor formation in vivo.","method":"Cell-based LIPG enzymatic assay, XEN445 pharmacological inhibition, IC50 determination, proliferation assays, tumor sphere assays, in vivo tumor formation","journal":"Scientific Reports","confidence":"High","confidence_rationale":"Tier 1–2 — enzymatic assay + pharmacological inhibition with in vivo validation","pmids":["32488004"],"is_preprint":false},{"year":2024,"finding":"ZDHHC1 palmitoylates IGF2BP1 at Cys337, causing IGF2BP1 to destabilize LIPG mRNA via m6A modification, thereby downregulating LIPG expression and inhibiting colorectal cancer cell proliferation and invasion.","method":"S-palmitoylation assay, site-directed mutagenesis (IGF2BP1-C337), m6A modification assay, LIPG mRNA stability assay, KD/OE in vitro and in vivo","journal":"Cancer Gene Therapy","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis of palmitoylation site, m6A assay, functional KD/OE; single lab","pmids":["39069526"],"is_preprint":false},{"year":2009,"finding":"Quantitative complementation testing and haplotype analysis in mouse crosses identified Lipg as the QTL gene controlling plasma HDL cholesterol levels on distal chromosome 18.","method":"QTL analysis, haplotype analysis, quantitative complementation testing, expression analysis, sequencing","journal":"Journal of Lipid Research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis/complementation in mouse, multiple methods; single study","pmids":["19436067"],"is_preprint":false},{"year":2011,"finding":"Rare regulatory variants in the LIPG promoter and 5' UTR alter LIPG gene expression (measured by luciferase reporter assay), and a common noncoding variant (rs34474737) in the 5' UTR that decreases LIPG promoter activity is in linkage disequilibrium with the coding SNP rs2000813, explaining the association of rs2000813 with reduced plasma endothelial lipase levels and increased HDL-C.","method":"Luciferase reporter assays, resequencing, LD analysis, plasma EL protein quantification","journal":"PLoS Genetics","confidence":"Medium","confidence_rationale":"Tier 1–2 — functional reporter assay linking regulatory variants to protein levels; single lab","pmids":["22174694"],"is_preprint":false},{"year":2025,"finding":"Endothelial lipase (EL/LIPG) promotes binding, uptake, and transcytosis of both LDL and HDL across primary human aortic endothelial cells, with its catalytic activity being essential for lipoprotein transport (but not surface association); ANGPTL3 selectively inhibits EL-mediated transendothelial LDL transport but not HDL transport; EL and scavenger receptor BI (SR-BI) act sequentially to mediate LDL uptake but independently for HDL uptake.","method":"Lipoprotein transcytosis assays in primary HAEC, catalytic mutant EL, ANGPTL3 inhibition, SR-BI co-functional studies, ex vivo bovine aorta LDL accumulation","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1–2 — catalytic mutant, multiple lipoprotein substrates, ex vivo validation; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2026,"finding":"NCBP2 stabilizes LIPG mRNA by directly binding the m7G motif in the 5'-cap structure of LIPG mRNA, increasing LIPG expression and promoting LIPG-dependent lipid droplet accumulation in colorectal cancer cells, which drives CRC proliferation, migration, and tumor invasion.","method":"RNA immunoprecipitation (RIP), LIPG mRNA stability assay, KD/OE in vitro and in vivo, lipid droplet quantification","journal":"Communications Biology","confidence":"Medium","confidence_rationale":"Tier 2 — RIP demonstrating direct mRNA binding, KD rescue, in vivo validation; single lab","pmids":["41872454"],"is_preprint":false}],"current_model":"LIPG (endothelial lipase) is a cell-surface serine phospholipase with predominant phospholipase A1 activity toward HDL phosphatidylcholine that catabolizes HDL-C; its catalytic activity mediates transendothelial lipoprotein transport (with ANGPTL3 acting as an inhibitor of LDL but not HDL transport); in cancer contexts, LIPG imports extracellular lipid precursors to fuel intracellular lipid synthesis—a function controlled transcriptionally by FoxA1/2 and post-transcriptionally by NCBP2/m7G-cap binding and ZDHHC1/IGF2BP1/m6A-mediated mRNA stability—and its protein stability is maintained by the DTX3L E3-ubiquitin ligase, while its enzymatic activity supports tumor proliferation and oxidative-stress-induced lipid droplet accumulation promotes cancer cell survival."},"narrative":{"teleology":[{"year":2009,"claim":"The identity of the gene underlying the HDL-C QTL on distal mouse chromosome 18 was unknown; quantitative complementation testing established Lipg as the causal gene controlling plasma HDL cholesterol levels, linking LIPG enzymatic function to systemic lipoprotein metabolism.","evidence":"QTL mapping, haplotype analysis, and quantitative complementation in mouse crosses","pmids":["19436067"],"confidence":"Medium","gaps":["Single genetic approach in mouse; human causal variants not functionally validated at this stage","Mechanism by which LIPG enzymatic activity modulates HDL-C not dissected"]},{"year":2011,"claim":"How common genetic variation at LIPG affects HDL-C was unclear; functional reporter assays showed that a noncoding 5' UTR variant (rs34474737) reduces LIPG promoter activity and is in LD with the coding SNP rs2000813, explaining the association between this locus and elevated HDL-C via reduced endothelial lipase expression.","evidence":"Luciferase reporter assays, resequencing, LD analysis, and plasma EL protein quantification in human cohorts","pmids":["22174694"],"confidence":"Medium","gaps":["Reporter assays in cell lines may not fully recapitulate in vivo regulatory context","Effect of rare coding variants on enzyme activity not tested"]},{"year":2016,"claim":"Whether LIPG had functions beyond lipoprotein metabolism was unknown; identification of FoxA1/2-driven LIPG transcription in breast cancer cells revealed that LIPG imports extracellular lipid precursors to support de novo intracellular lipid synthesis and tumor proliferation.","evidence":"siRNA knockdown, ChIP/reporter assays, lipid metabolomics, and proliferation assays in breast cancer cells","pmids":["27045898"],"confidence":"High","gaps":["Specific lipid species imported by LIPG not fully resolved","Whether FoxA control of LIPG operates in non-breast cancer contexts untested"]},{"year":2018,"claim":"How LIPG protein levels are maintained in cancer and whether all LIPG tumor-promoting functions require catalytic activity were open questions; DTX3L was shown to stabilize LIPG protein by preventing proteasomal degradation, and separation-of-function experiments demonstrated a lipase-independent role for LIPG in invasiveness and stemness via the DTX3L–ISG15 (ISGylation) axis.","evidence":"Reciprocal co-immunoprecipitation, proteasome inhibitor assays, lipase-dead mutant rescue, and in vivo tumorigenicity in TNBC models","pmids":["29350614"],"confidence":"High","gaps":["Structural basis of the LIPG–DTX3L interaction undefined","Whether ISGylation directly modifies LIPG or acts through intermediaries not resolved"]},{"year":2019,"claim":"The connection between metabolic stress and LIPG-dependent lipid storage was unexplored; AMPK activation under severe oxidative stress was shown to upregulate LIPG, driving lipid droplet accumulation that protects breast cancer cells from oxidative death.","evidence":"AMPK activator/inhibitor treatments, LIPG knockdown, lipid droplet staining, and cell viability assays in breast cancer cells","pmids":["30653260"],"confidence":"Medium","gaps":["Single-lab study; AMPK–LIPG transcriptional link not mapped to a specific promoter element","Whether lipid droplet-mediated protection is specific to breast cancer or generalizable unknown"]},{"year":2020,"claim":"Whether LIPG's catalytic activity was strictly required for its tumor-promoting functions and whether pharmacological inhibition could target it were unanswered; XEN445, a selective phospholipase inhibitor, suppressed LIPG-expressing TNBC cell growth and tumor sphere formation in vitro and tumor formation in vivo, confirming phospholipase A1 activity as essential for proliferation. Separately, LIPG expression induced by the hepatic microenvironment promoted leukemia cell proliferation via PUFA-mediated pathways.","evidence":"Cell-based LIPG enzymatic assays, XEN445 pharmacological inhibition with IC50, in vivo tumor formation (TNBC); co-culture with liver stroma, lipidomics, and in vivo leukemia models (leukemia)","pmids":["32488004","33028621"],"confidence":"High","gaps":["XEN445 selectivity in vivo not fully characterized","Identity of PUFA species driving leukemia survival not pinpointed","Whether LIPG inhibition spares normal hematopoietic cells unclear"]},{"year":2024,"claim":"Post-transcriptional regulation of LIPG mRNA was poorly understood; ZDHHC1 was shown to palmitoylate IGF2BP1 at Cys337, causing IGF2BP1 to destabilize LIPG mRNA via m6A modification, thereby suppressing LIPG expression and inhibiting colorectal cancer proliferation.","evidence":"S-palmitoylation assay, site-directed mutagenesis of IGF2BP1-C337, m6A modification and mRNA stability assays, KD/OE in CRC cells in vitro and in vivo","pmids":["39069526"],"confidence":"Medium","gaps":["Single-lab study; palmitoylation–m6A link not confirmed by independent group","Specific m6A reader/writer machinery acting on LIPG mRNA not fully delineated"]},{"year":2026,"claim":"A second, independent post-transcriptional mechanism controlling LIPG was identified: NCBP2 directly binds the m7G cap of LIPG mRNA, stabilizing it and increasing LIPG protein expression, which drives lipid droplet accumulation and CRC tumor growth.","evidence":"RNA immunoprecipitation showing direct NCBP2–LIPG mRNA binding, mRNA stability assays, KD/OE with in vivo tumor models, lipid droplet quantification in CRC cells","pmids":["41872454"],"confidence":"Medium","gaps":["Relationship between NCBP2 cap-binding and the IGF2BP1/m6A decay pathway for LIPG mRNA not integrated","Whether NCBP2 regulation of LIPG is CRC-specific or general unknown"]},{"year":null,"claim":"Key unresolved questions include the structural basis of LIPG's dual catalytic and non-catalytic functions, the integration of multiple post-transcriptional regulatory layers (m6A decay vs. m7G cap stabilization) in physiological contexts, and whether LIPG-dependent transendothelial lipoprotein transport contributes to its tumor-promoting roles.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal structure of full-length LIPG available","Transendothelial lipoprotein transport function (preprint) not yet peer-reviewed or tested in cancer models","In vivo therapeutic window for LIPG inhibition in cancer vs. HDL metabolism not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,4]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,8]},{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[2,9]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,3,4,6]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,3,4]}],"complexes":[],"partners":["DTX3L","FOXA1","FOXA2","IGF2BP1","NCBP2","SCARB1"],"other_free_text":[]},"mechanistic_narrative":"LIPG (endothelial lipase) is a cell-surface serine phospholipase with predominant phospholipase A1 activity toward phosphatidylcholine in HDL that functions as a major determinant of plasma HDL cholesterol levels and, in cancer contexts, as a critical importer of extracellular lipid precursors that fuel intracellular lipid synthesis and cell proliferation. Genetic studies in mice and humans established LIPG as the quantitative trait locus gene controlling HDL-C, with regulatory variants in the LIPG promoter and 5' UTR modulating gene expression and circulating endothelial lipase levels [PMID:19436067, PMID:22174694]. In triple-negative breast cancer, LIPG's catalytic phospholipase activity is required for tumor cell proliferation and cancer stem cell self-renewal, while a lipase-independent function promotes invasiveness and stemness; LIPG protein stability is maintained by the E3 ubiquitin ligase DTX3L, and oxidative stress induces LIPG via AMPK to drive protective lipid droplet accumulation [PMID:29350614, PMID:32488004, PMID:30653260]. LIPG expression is transcriptionally controlled by FoxA1/FoxA2 in breast cancer and post-transcriptionally regulated through NCBP2-mediated m7G-cap binding that stabilizes LIPG mRNA and ZDHHC1/IGF2BP1-dependent m6A-mediated mRNA destabilization, with LIPG-driven lipid remodeling also supporting leukemia cell survival in hepatic microenvironments [PMID:27045898, PMID:41872454, PMID:39069526, PMID:33028621]."},"prefetch_data":{"uniprot":{"accession":"Q9Y5X9","full_name":"Endothelial lipase","aliases":["Endothelial cell-derived lipase","EDL","EL","Phospholipase A1"],"length_aa":500,"mass_kda":56.8,"function":"Exerts both phospholipase and triglyceride lipase activities (PubMed:10192396, PubMed:10318835, PubMed:12032167). More active as a phospholipase than a triglyceride lipase (PubMed:12032167). Hydrolyzes triglycerides, both with short-chain fatty acyl groups (tributyrin) and long-chain fatty acyl groups (triolein) with similar levels of activity toward both types of substrates (PubMed:12032167). Hydrolyzes high density lipoproteins (HDL) more efficiently than other lipoproteins (PubMed:10192396, PubMed:12032167)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/Q9Y5X9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LIPG","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LIPG","total_profiled":1310},"omim":[{"mim_id":"607365","title":"LIPASE H; LIPH","url":"https://www.omim.org/entry/607365"},{"mim_id":"603684","title":"LIPASE, ENDOTHELIAL; LIPG","url":"https://www.omim.org/entry/603684"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"placenta","ntpm":140.4},{"tissue":"thyroid gland","ntpm":226.7}],"url":"https://www.proteinatlas.org/search/LIPG"},"hgnc":{"alias_symbol":["EDL"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y5X9","domains":[{"cath_id":"3.40.50.1820","chopping":"51-337","consensus_level":"high","plddt":91.3967,"start":51,"end":337},{"cath_id":"2.60.60.20","chopping":"348-428_444-484","consensus_level":"high","plddt":87.8421,"start":348,"end":484}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5X9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5X9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5X9-F1-predicted_aligned_error_v6.png","plddt_mean":82.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LIPG","jax_strain_url":"https://www.jax.org/strain/search?query=LIPG"},"sequence":{"accession":"Q9Y5X9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y5X9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y5X9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5X9"}},"corpus_meta":[{"pmid":"7868227","id":"PMC_7868227","title":"Molecular analysis of the plasmid-encoded hemolysin of Escherichia coli O157:H7 strain EDL 933.","date":"1995","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/7868227","citation_count":536,"is_preprint":false},{"pmid":"16709649","id":"PMC_16709649","title":"Contractile properties of EDL and soleus muscles of myostatin-deficient mice.","date":"2006","source":"Journal of applied physiology (Bethesda, Md. : 1985)","url":"https://pubmed.ncbi.nlm.nih.gov/16709649","citation_count":126,"is_preprint":false},{"pmid":"9477302","id":"PMC_9477302","title":"Differential myogenicity of satellite cells isolated from extensor digitorum longus (EDL) and soleus rat muscles revealed in vitro.","date":"1998","source":"Cell and tissue research","url":"https://pubmed.ncbi.nlm.nih.gov/9477302","citation_count":88,"is_preprint":false},{"pmid":"16243468","id":"PMC_16243468","title":"Soleus and EDL muscle contractility across the lifespan of female C57BL/6 mice.","date":"2005","source":"Experimental gerontology","url":"https://pubmed.ncbi.nlm.nih.gov/16243468","citation_count":78,"is_preprint":false},{"pmid":"12917105","id":"PMC_12917105","title":"KATP channels depress force by reducing action potential amplitude in mouse EDL and soleus muscle.","date":"2003","source":"American journal of physiology. 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Mechanistically, DTX3L (an E3-ubiquitin ligase) stabilizes LIPG protein by inhibiting proteasome-mediated degradation, and LIPG participates in DTX3L-ISG15 signaling (ISGylation pathway) to drive TNBC malignancy.\",\n      \"method\": \"siRNA/shRNA knockdown, proteasome inhibitor assays, co-immunoprecipitation, lipase-dead mutant rescue experiments, in vivo tumorigenicity assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, enzymatic mutants, in vivo rescue, multiple orthogonal methods in one study\",\n      \"pmids\": [\"29350614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Severe oxidative stress activates AMPK, which triggers LIPG upregulation in breast cancer cells, leading to intracellular lipid droplet accumulation that protects cells from oxidative stress-induced death; neutralizing oxidative stress abrogates both LIPG upregulation and the concomitant lipid storage.\",\n      \"method\": \"AMPK activation/inhibition, LIPG knockdown, lipid droplet staining, cell viability assays\",\n      \"journal\": \"International Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype, but single lab\",\n      \"pmids\": [\"30653260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIPG expression is induced by the hepatic microenvironment in leukemia cells, stimulating tumor cell proliferation through polyunsaturated fatty acid (PUFA)-mediated pathways and promoting survival by stabilizing antiapoptotic proteins.\",\n      \"method\": \"Co-culture with liver stromal cells, LIPG knockdown/overexpression, lipidomics, apoptosis assays, in vivo leukemia models\",\n      \"journal\": \"Cancer Discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo model with mechanistic follow-up, single lab\",\n      \"pmids\": [\"33028621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIPG functions as a cell-surface phospholipase A1 active toward phosphatidylcholine in HDL; its phospholipase catalytic activity is required for LIPG-mediated support of TNBC cell proliferation and tumor formation, as demonstrated by the specific phospholipase inhibitor XEN445 selectively suppressing LIPG-expressing TNBC cell growth and cancer stem cell self-renewal in vitro and tumor formation in vivo.\",\n      \"method\": \"Cell-based LIPG enzymatic assay, XEN445 pharmacological inhibition, IC50 determination, proliferation assays, tumor sphere assays, in vivo tumor formation\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — enzymatic assay + pharmacological inhibition with in vivo validation\",\n      \"pmids\": [\"32488004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZDHHC1 palmitoylates IGF2BP1 at Cys337, causing IGF2BP1 to destabilize LIPG mRNA via m6A modification, thereby downregulating LIPG expression and inhibiting colorectal cancer cell proliferation and invasion.\",\n      \"method\": \"S-palmitoylation assay, site-directed mutagenesis (IGF2BP1-C337), m6A modification assay, LIPG mRNA stability assay, KD/OE in vitro and in vivo\",\n      \"journal\": \"Cancer Gene Therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis of palmitoylation site, m6A assay, functional KD/OE; single lab\",\n      \"pmids\": [\"39069526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Quantitative complementation testing and haplotype analysis in mouse crosses identified Lipg as the QTL gene controlling plasma HDL cholesterol levels on distal chromosome 18.\",\n      \"method\": \"QTL analysis, haplotype analysis, quantitative complementation testing, expression analysis, sequencing\",\n      \"journal\": \"Journal of Lipid Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis/complementation in mouse, multiple methods; single study\",\n      \"pmids\": [\"19436067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rare regulatory variants in the LIPG promoter and 5' UTR alter LIPG gene expression (measured by luciferase reporter assay), and a common noncoding variant (rs34474737) in the 5' UTR that decreases LIPG promoter activity is in linkage disequilibrium with the coding SNP rs2000813, explaining the association of rs2000813 with reduced plasma endothelial lipase levels and increased HDL-C.\",\n      \"method\": \"Luciferase reporter assays, resequencing, LD analysis, plasma EL protein quantification\",\n      \"journal\": \"PLoS Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — functional reporter assay linking regulatory variants to protein levels; single lab\",\n      \"pmids\": [\"22174694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Endothelial lipase (EL/LIPG) promotes binding, uptake, and transcytosis of both LDL and HDL across primary human aortic endothelial cells, with its catalytic activity being essential for lipoprotein transport (but not surface association); ANGPTL3 selectively inhibits EL-mediated transendothelial LDL transport but not HDL transport; EL and scavenger receptor BI (SR-BI) act sequentially to mediate LDL uptake but independently for HDL uptake.\",\n      \"method\": \"Lipoprotein transcytosis assays in primary HAEC, catalytic mutant EL, ANGPTL3 inhibition, SR-BI co-functional studies, ex vivo bovine aorta LDL accumulation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — catalytic mutant, multiple lipoprotein substrates, ex vivo validation; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NCBP2 stabilizes LIPG mRNA by directly binding the m7G motif in the 5'-cap structure of LIPG mRNA, increasing LIPG expression and promoting LIPG-dependent lipid droplet accumulation in colorectal cancer cells, which drives CRC proliferation, migration, and tumor invasion.\",\n      \"method\": \"RNA immunoprecipitation (RIP), LIPG mRNA stability assay, KD/OE in vitro and in vivo, lipid droplet quantification\",\n      \"journal\": \"Communications Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP demonstrating direct mRNA binding, KD rescue, in vivo validation; single lab\",\n      \"pmids\": [\"41872454\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LIPG (endothelial lipase) is a cell-surface serine phospholipase with predominant phospholipase A1 activity toward HDL phosphatidylcholine that catabolizes HDL-C; its catalytic activity mediates transendothelial lipoprotein transport (with ANGPTL3 acting as an inhibitor of LDL but not HDL transport); in cancer contexts, LIPG imports extracellular lipid precursors to fuel intracellular lipid synthesis—a function controlled transcriptionally by FoxA1/2 and post-transcriptionally by NCBP2/m7G-cap binding and ZDHHC1/IGF2BP1/m6A-mediated mRNA stability—and its protein stability is maintained by the DTX3L E3-ubiquitin ligase, while its enzymatic activity supports tumor proliferation and oxidative-stress-induced lipid droplet accumulation promotes cancer cell survival.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"LIPG (endothelial lipase) is a cell-surface serine phospholipase with predominant phospholipase A1 activity toward phosphatidylcholine in HDL that functions as a major determinant of plasma HDL cholesterol levels and, in cancer contexts, as a critical importer of extracellular lipid precursors that fuel intracellular lipid synthesis and cell proliferation. Genetic studies in mice and humans established LIPG as the quantitative trait locus gene controlling HDL-C, with regulatory variants in the LIPG promoter and 5' UTR modulating gene expression and circulating endothelial lipase levels [PMID:19436067, PMID:22174694]. In triple-negative breast cancer, LIPG's catalytic phospholipase activity is required for tumor cell proliferation and cancer stem cell self-renewal, while a lipase-independent function promotes invasiveness and stemness; LIPG protein stability is maintained by the E3 ubiquitin ligase DTX3L, and oxidative stress induces LIPG via AMPK to drive protective lipid droplet accumulation [PMID:29350614, PMID:32488004, PMID:30653260]. LIPG expression is transcriptionally controlled by FoxA1/FoxA2 in breast cancer and post-transcriptionally regulated through NCBP2-mediated m7G-cap binding that stabilizes LIPG mRNA and ZDHHC1/IGF2BP1-dependent m6A-mediated mRNA destabilization, with LIPG-driven lipid remodeling also supporting leukemia cell survival in hepatic microenvironments [PMID:27045898, PMID:41872454, PMID:39069526, PMID:33028621].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"The identity of the gene underlying the HDL-C QTL on distal mouse chromosome 18 was unknown; quantitative complementation testing established Lipg as the causal gene controlling plasma HDL cholesterol levels, linking LIPG enzymatic function to systemic lipoprotein metabolism.\",\n      \"evidence\": \"QTL mapping, haplotype analysis, and quantitative complementation in mouse crosses\",\n      \"pmids\": [\"19436067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single genetic approach in mouse; human causal variants not functionally validated at this stage\", \"Mechanism by which LIPG enzymatic activity modulates HDL-C not dissected\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"How common genetic variation at LIPG affects HDL-C was unclear; functional reporter assays showed that a noncoding 5' UTR variant (rs34474737) reduces LIPG promoter activity and is in LD with the coding SNP rs2000813, explaining the association between this locus and elevated HDL-C via reduced endothelial lipase expression.\",\n      \"evidence\": \"Luciferase reporter assays, resequencing, LD analysis, and plasma EL protein quantification in human cohorts\",\n      \"pmids\": [\"22174694\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reporter assays in cell lines may not fully recapitulate in vivo regulatory context\", \"Effect of rare coding variants on enzyme activity not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Whether LIPG had functions beyond lipoprotein metabolism was unknown; identification of FoxA1/2-driven LIPG transcription in breast cancer cells revealed that LIPG imports extracellular lipid precursors to support de novo intracellular lipid synthesis and tumor proliferation.\",\n      \"evidence\": \"siRNA knockdown, ChIP/reporter assays, lipid metabolomics, and proliferation assays in breast cancer cells\",\n      \"pmids\": [\"27045898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific lipid species imported by LIPG not fully resolved\", \"Whether FoxA control of LIPG operates in non-breast cancer contexts untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"How LIPG protein levels are maintained in cancer and whether all LIPG tumor-promoting functions require catalytic activity were open questions; DTX3L was shown to stabilize LIPG protein by preventing proteasomal degradation, and separation-of-function experiments demonstrated a lipase-independent role for LIPG in invasiveness and stemness via the DTX3L–ISG15 (ISGylation) axis.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, proteasome inhibitor assays, lipase-dead mutant rescue, and in vivo tumorigenicity in TNBC models\",\n      \"pmids\": [\"29350614\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the LIPG–DTX3L interaction undefined\", \"Whether ISGylation directly modifies LIPG or acts through intermediaries not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The connection between metabolic stress and LIPG-dependent lipid storage was unexplored; AMPK activation under severe oxidative stress was shown to upregulate LIPG, driving lipid droplet accumulation that protects breast cancer cells from oxidative death.\",\n      \"evidence\": \"AMPK activator/inhibitor treatments, LIPG knockdown, lipid droplet staining, and cell viability assays in breast cancer cells\",\n      \"pmids\": [\"30653260\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study; AMPK–LIPG transcriptional link not mapped to a specific promoter element\", \"Whether lipid droplet-mediated protection is specific to breast cancer or generalizable unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Whether LIPG's catalytic activity was strictly required for its tumor-promoting functions and whether pharmacological inhibition could target it were unanswered; XEN445, a selective phospholipase inhibitor, suppressed LIPG-expressing TNBC cell growth and tumor sphere formation in vitro and tumor formation in vivo, confirming phospholipase A1 activity as essential for proliferation. Separately, LIPG expression induced by the hepatic microenvironment promoted leukemia cell proliferation via PUFA-mediated pathways.\",\n      \"evidence\": \"Cell-based LIPG enzymatic assays, XEN445 pharmacological inhibition with IC50, in vivo tumor formation (TNBC); co-culture with liver stroma, lipidomics, and in vivo leukemia models (leukemia)\",\n      \"pmids\": [\"32488004\", \"33028621\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"XEN445 selectivity in vivo not fully characterized\", \"Identity of PUFA species driving leukemia survival not pinpointed\", \"Whether LIPG inhibition spares normal hematopoietic cells unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Post-transcriptional regulation of LIPG mRNA was poorly understood; ZDHHC1 was shown to palmitoylate IGF2BP1 at Cys337, causing IGF2BP1 to destabilize LIPG mRNA via m6A modification, thereby suppressing LIPG expression and inhibiting colorectal cancer proliferation.\",\n      \"evidence\": \"S-palmitoylation assay, site-directed mutagenesis of IGF2BP1-C337, m6A modification and mRNA stability assays, KD/OE in CRC cells in vitro and in vivo\",\n      \"pmids\": [\"39069526\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study; palmitoylation–m6A link not confirmed by independent group\", \"Specific m6A reader/writer machinery acting on LIPG mRNA not fully delineated\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"A second, independent post-transcriptional mechanism controlling LIPG was identified: NCBP2 directly binds the m7G cap of LIPG mRNA, stabilizing it and increasing LIPG protein expression, which drives lipid droplet accumulation and CRC tumor growth.\",\n      \"evidence\": \"RNA immunoprecipitation showing direct NCBP2–LIPG mRNA binding, mRNA stability assays, KD/OE with in vivo tumor models, lipid droplet quantification in CRC cells\",\n      \"pmids\": [\"41872454\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship between NCBP2 cap-binding and the IGF2BP1/m6A decay pathway for LIPG mRNA not integrated\", \"Whether NCBP2 regulation of LIPG is CRC-specific or general unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of LIPG's dual catalytic and non-catalytic functions, the integration of multiple post-transcriptional regulatory layers (m6A decay vs. m7G cap stabilization) in physiological contexts, and whether LIPG-dependent transendothelial lipoprotein transport contributes to its tumor-promoting roles.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal structure of full-length LIPG available\", \"Transendothelial lipoprotein transport function (preprint) not yet peer-reviewed or tested in cancer models\", \"In vivo therapeutic window for LIPG inhibition in cancer vs. HDL metabolism not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 8]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [2, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 3, 4, 6]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 3, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"DTX3L\",\n      \"FOXA1\",\n      \"FOXA2\",\n      \"IGF2BP1\",\n      \"NCBP2\",\n      \"SCARB1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}