{"gene":"LIPG","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2004,"finding":"LIPG (endothelial lipase) is a member of the triglyceride lipase family with both triglyceride lipase and phospholipase activities; genetic variants in LIPG are associated with altered HDL cholesterol levels in humans, consistent with its role in HDL metabolism.","method":"Resequencing of the LIPG gene in an ethnically diverse population followed by association analysis with HDL cholesterol levels","journal":"Biochimica et biophysica acta","confidence":"Low","confidence_rationale":"Tier 4 / Weak — genetic association study, no direct in vitro enzymatic characterization performed in this paper; functional inference from family membership","pmids":["14984737"],"is_preprint":false},{"year":2009,"finding":"Lipg was identified as the quantitative trait locus (QTL) gene controlling plasma HDL levels on mouse chromosome 18, through quantitative complementation testing combined with haplotype analysis and expression studies across multiple mouse crosses.","method":"QTL analysis across multiple mouse crosses, haplotype analysis, gene expression analysis, and quantitative complementation testing","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (QTL mapping, haplotype analysis, complementation testing) in a single study, single lab","pmids":["19436067"],"is_preprint":false},{"year":2011,"finding":"Both rare and common noncoding regulatory variants in the LIPG promoter and 5' UTR alter LIPG promoter activity (measured by luciferase reporter assay) and are associated with plasma endothelial lipase protein levels and HDL cholesterol; a common 5' UTR variant (rs34474737) in linkage disequilibrium with the coding SNP rs2000813 decreases LIPG promoter activity and accounts for the observed HDL-C association.","method":"Resequencing of LIPG promoter and 5' UTR, luciferase reporter assays, association analysis with plasma EL protein levels and HDL-C","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional luciferase assay plus genetic association, single lab, two orthogonal methods","pmids":["22174694"],"is_preprint":false},{"year":2016,"finding":"LIPG expression in breast cancer cells is driven by FoxA1 or FoxA2 transcription factors, and LIPG enables import of extracellular lipid precursors that fuel intracellular lipid synthesis required for breast cancer cell proliferation; knockdown of LIPG or FoxA reduces proliferation and impairs synthesis of intracellular lipids.","method":"Knockdown of LIPG and FoxA in breast cancer cell lines with measurement of proliferation and intracellular lipid synthesis; lipidomic analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with defined proliferation and lipid synthesis phenotype, single lab, multiple orthogonal readouts","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, stemness and epithelial-mesenchymal transition in TNBC; DTX3L (an E3-ubiquitin ligase) maintains LIPG protein levels by inhibiting proteasome-mediated degradation; LIPG participates in DTX3L-ISG15 interferon signaling (ISGylation), and this DTX3L-LIPG-ISG15 axis is essential for TNBC malignancy.","method":"In vivo tumorigenicity and metastasis assays, lipase-dead mutants, proteasome inhibitor experiments, Co-immunoprecipitation, siRNA knockdown of DTX3L and LIPG","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (in vivo assays, mutagenesis, Co-IP, KD), single lab","pmids":["29350614"],"is_preprint":false},{"year":2019,"finding":"Severe oxidative stress leading to AMPK activation triggers LIPG upregulation in breast cancer cells, resulting in intracellular lipid droplet accumulation that supports cell survival under oxidative stress; neutralizing oxidative stress abolished LIPG upregulation and the associated lipid storage.","method":"Oxidative stress induction with AMPK activation measurement, LIPG expression analysis, lipid droplet quantification in breast cancer cell lines, neutralization of oxidative stress","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined mechanistic pathway (oxidative stress→AMPK→LIPG→lipid droplets) with multiple perturbations, single lab","pmids":["30653260"],"is_preprint":false},{"year":2020,"finding":"LIPG is a cell surface-associated lipase displaying phospholipase A1 activity toward phosphatidylcholine in HDL; in the hepatic microenvironment, leukemia cells upregulate endothelial lipase to stimulate tumor cell proliferation through polyunsaturated fatty acid (PUFA)-mediated pathways and to promote survival by stabilizing antiapoptotic proteins.","method":"Liver microenvironment co-culture models, LIPG expression analysis, PUFA pathway analysis, apoptotic protein stability assays in leukemia cells","journal":"Cancer discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined mechanism linking LIPG to PUFA signaling and antiapoptotic protein stabilization, single lab, multiple readouts","pmids":["33028621"],"is_preprint":false},{"year":2020,"finding":"Inhibition of LIPG phospholipase activity by XEN445 (a specific LIPG inhibitor) preferentially inhibits proliferation of LIPG-expressing TNBC cells but not LIPG-negative luminal breast cancer cells, inhibits cancer stem cell self-renewal in vitro, and suppresses TNBC tumor formation in vivo, but has no effect on invasiveness or CSC stemness, indicating the enzymatic function is responsible for proliferative but not invasive phenotypes.","method":"Cell-based LIPG enzymatic assay, XEN445 treatment of TNBC and luminal breast cancer cell lines, in vitro CSC self-renewal assay, in vivo tumor formation assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — enzymatic inhibition with specific pharmacological tool plus in vivo validation, single lab, multiple orthogonal readouts","pmids":["32488004"],"is_preprint":false},{"year":2024,"finding":"ZDHHC1 downregulates LIPG expression via palmitoylation of IGF2BP1 at C337, which induces m6A-dependent reduction of LIPG mRNA stability; the ZDHHC1/IGF2BP1/LIPG signaling axis inhibits colorectal cancer cell growth and lipid storage.","method":"ZDHHC1 knockdown and overexpression in CRC cells, IGF2BP1 palmitoylation site mutagenesis, m6A modification analysis, LIPG mRNA stability assays, in vitro and in vivo proliferation and invasion assays","journal":"Cancer gene therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — palmitoylation site-specific mutagenesis plus m6A assays and functional phenotype, single lab, multiple orthogonal methods","pmids":["39069526"],"is_preprint":false},{"year":2025,"finding":"Endothelial lipase (EL, encoded by LIPG) promotes binding, uptake, and transcytosis of LDL and HDL across primary human aortic endothelial cells; EL's catalytic activity is essential for lipoprotein transport but not for surface association; EL and scavenger receptor BI (SR-BI) act sequentially to mediate LDL uptake but independently for HDL uptake; ANGPTL3 selectively inhibits EL-mediated transcytosis of LDL but not HDL.","method":"EL overexpression and knockdown in primary human aortic endothelial cells (HAEC), fluorescent lipoprotein transport assays, enzymatic inhibition, SR-BI co-perturbation, ex vivo bovine aorta LDL accumulation assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (overexpression, KD, enzymatic inhibition, ex vivo validation), single lab, preprint not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2025,"finding":"EL (encoded by LIPG) overexpression almost fully rescues LDL uptake in LDLR-knockout HepG2 hepatocytes; this EL-mediated LDL uptake is completely blocked by heparinases and heparin, indicating dependence on heparan sulfate proteoglycans (HSPG); EL's enzymatic activity (inhibited by tetrahydrolipstatin) is required for HSPG-dependent LDL uptake.","method":"LIPG overexpression in control and LDLR-KO HepG2 cells, FACS-based fluorescent LDL uptake assay, heparin/heparinase treatment, tetrahydrolipstatin enzymatic inhibition","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic KO rescue system, pharmacological and enzymatic perturbations, multiple orthogonal methods, single lab, preprint","pmids":[],"is_preprint":true},{"year":2001,"finding":"The rat Lipg gene was sequenced and chromosomally mapped to rat chromosome 18 in the vicinity of marker D18Mit11, a region syntenic with human and mouse chromosome 18.","method":"Gene sequencing using primers based on mouse mRNA sequence; rat-hamster radiation hybrid (RH) panel for chromosomal assignment","journal":"DNA sequence : the journal of DNA sequencing and mapping","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single mapping experiment, no functional characterization","pmids":["11924532"],"is_preprint":false}],"current_model":"LIPG (endothelial lipase) is a cell surface-associated phospholipase A1 with low triglyceride lipase activity that remodels HDL phosphatidylcholine and, through its catalytic activity and heparan sulfate proteoglycan-dependent mechanisms, mediates transcytosis and uptake of LDL and HDL across endothelial cells; in cancer cells it imports extracellular lipid precursors to fuel intracellular lipid synthesis and proliferation, its expression is transcriptionally regulated by FoxA1/2 and post-transcriptionally by the ZDHHC1/IGF2BP1/m6A axis, its protein stability is maintained by the DTX3L E3 ubiquitin ligase through inhibition of proteasomal degradation, and it participates in DTX3L-ISG15 interferon signaling to promote tumor malignancy."},"narrative":{"mechanistic_narrative":"LIPG encodes endothelial lipase, a cell surface-associated member of the triglyceride lipase family that functions principally as a phospholipase A1 hydrolyzing phosphatidylcholine in HDL, and whose activity governs plasma HDL cholesterol levels in humans and mice [PMID:19436067, PMID:33028621]. Both rare and common noncoding regulatory variants in the LIPG promoter and 5' UTR alter promoter activity and track with circulating endothelial lipase protein and HDL-C [PMID:22174694]. At the endothelial surface, the enzyme mediates binding, uptake, and transcytosis of both LDL and HDL across aortic endothelial cells; its catalytic activity is required for lipoprotein transport but not for surface association, it acts sequentially with SR-BI for LDL but independently for HDL, and ANGPTL3 selectively inhibits its LDL transcytosis. In hepatocytes its LDL uptake activity depends on heparan sulfate proteoglycans and on its enzymatic function, sufficient to rescue uptake in LDLR-knockout cells. Beyond lipoprotein metabolism, LIPG has a prominent role in cancer cell lipid acquisition: driven by FoxA1/FoxA2 transcription factors, it imports extracellular lipid precursors that fuel intracellular lipid synthesis and tumor cell proliferation [PMID:27045898], and it is induced by oxidative-stress-triggered AMPK activation to drive lipid droplet accumulation supporting survival [PMID:30653260]. In triple-negative breast cancer it possesses separable functions—a lipase-dependent activity supporting proliferation and a lipase-independent activity promoting invasiveness, stemness, and EMT—where its protein stability is maintained by the DTX3L E3 ubiquitin ligase via inhibition of proteasomal degradation and it participates in DTX3L-ISG15 interferon signaling [PMID:29350614]; pharmacological inhibition of its phospholipase activity with XEN445 selectively blocks proliferative but not invasive phenotypes [PMID:32488004]. Its expression is also post-transcriptionally repressed through a ZDHHC1/IGF2BP1 palmitoylation-dependent m6A axis that destabilizes LIPG mRNA [PMID:39069526].","teleology":[{"year":2004,"claim":"Established LIPG as a triglyceride-lipase-family enzyme with phospholipase activity whose human genetic variation links it to HDL cholesterol regulation.","evidence":"Resequencing of LIPG across an ethnically diverse population with HDL-C association analysis","pmids":["14984737"],"confidence":"Low","gaps":["No direct in vitro enzymatic assay performed in this study","Functional role inferred from family membership and association, not causation"]},{"year":2009,"claim":"Demonstrated that Lipg is the causal QTL gene controlling plasma HDL levels, moving the gene-HDL link from association to genetic causality.","evidence":"QTL mapping, haplotype analysis, and quantitative complementation across multiple mouse crosses","pmids":["19436067"],"confidence":"Medium","gaps":["Mechanism by which Lipg sets HDL levels not resolved at molecular level","Single lab"]},{"year":2011,"claim":"Identified the regulatory basis of LIPG-driven HDL variation by showing noncoding promoter/5' UTR variants alter promoter activity and protein levels.","evidence":"Resequencing, luciferase reporter assays, and association with plasma EL protein and HDL-C","pmids":["22174694"],"confidence":"Medium","gaps":["Does not address enzymatic mechanism on lipoproteins","Causal variant effects shown in reporter context only"]},{"year":2016,"claim":"Revealed a cancer-specific role: FoxA-driven LIPG imports extracellular lipid precursors to fuel lipid synthesis and breast cancer proliferation.","evidence":"LIPG and FoxA knockdown in breast cancer lines with proliferation, lipid synthesis, and lipidomic readouts","pmids":["27045898"],"confidence":"Medium","gaps":["Mechanism of precursor import not biochemically defined","Single lab"]},{"year":2018,"claim":"Separated LIPG into lipase-dependent (proliferation) and lipase-independent (invasion/stemness/EMT) functions and identified DTX3L as a stabilizer linking LIPG to ISG15 interferon signaling.","evidence":"In vivo tumorigenicity/metastasis assays, lipase-dead mutants, proteasome inhibition, Co-IP, and siRNA knockdown","pmids":["29350614"],"confidence":"Medium","gaps":["Molecular basis of the lipase-independent function unresolved","DTX3L-LIPG interaction shown by Co-IP without reciprocal structural validation"]},{"year":2019,"claim":"Connected LIPG to stress adaptation by showing oxidative-stress-induced AMPK activation upregulates LIPG to drive protective lipid droplet accumulation.","evidence":"Oxidative stress induction with AMPK measurement, LIPG expression, lipid droplet quantification, and stress neutralization in breast cancer cells","pmids":["30653260"],"confidence":"Medium","gaps":["Direct transcriptional link between AMPK and LIPG not defined","Single lab"]},{"year":2020,"claim":"Confirmed LIPG as a cell-surface phospholipase A1 acting on HDL phosphatidylcholine and extended its tumor role to leukemia via PUFA signaling and antiapoptotic protein stabilization.","evidence":"Liver microenvironment co-culture, PUFA pathway analysis, and apoptotic protein stability assays","pmids":["33028621"],"confidence":"Medium","gaps":["PUFA-mediated signaling pathway not fully delineated","Single lab"]},{"year":2020,"claim":"Pharmacologically dissected LIPG functions, showing its enzymatic activity drives proliferation and CSC self-renewal but not invasiveness.","evidence":"XEN445 enzymatic inhibition of TNBC vs luminal lines, in vitro CSC self-renewal, and in vivo tumor formation assays","pmids":["32488004"],"confidence":"Medium","gaps":["Substrate consumed in proliferative phenotype not identified","Lipase-independent invasion mechanism remains undefined"]},{"year":2024,"claim":"Identified post-transcriptional control of LIPG through a ZDHHC1/IGF2BP1 palmitoylation-m6A axis that destabilizes LIPG mRNA and suppresses colorectal cancer growth.","evidence":"ZDHHC1 perturbation, IGF2BP1 C337 palmitoylation-site mutagenesis, m6A and mRNA stability assays, in vitro/in vivo phenotypes","pmids":["39069526"],"confidence":"Medium","gaps":["Generality of this regulatory axis across tissues not established","Single lab"]},{"year":2025,"claim":"Established LIPG as a transcytosis machine for both LDL and HDL across endothelium, with catalysis required for transport, distinct SR-BI coordination, and selective ANGPTL3 regulation.","evidence":"EL overexpression/knockdown in primary human aortic endothelial cells, fluorescent lipoprotein transport assays, enzymatic inhibition, SR-BI co-perturbation, ex vivo bovine aorta assay (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Mechanistic coupling between catalysis and transcytosis not resolved"]},{"year":2025,"claim":"Demonstrated that EL-mediated LDL uptake is heparan-sulfate-proteoglycan- and enzymatic-activity-dependent and can substitute for LDLR in hepatocytes.","evidence":"LIPG overexpression in LDLR-KO HepG2 cells, FACS LDL uptake, heparin/heparinase treatment, tetrahydrolipstatin inhibition (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Physiological contribution of HSPG-dependent uptake relative to LDLR in vivo not quantified"]},{"year":null,"claim":"The molecular basis of LIPG's lipase-independent functions and the structural mechanism coupling its phospholipase activity to lipoprotein uptake/transcytosis remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model linking catalysis to transcytosis","Lipase-independent invasion/stemness mechanism uncharacterized","Identity of imported lipid species fueling cancer proliferation not fully defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,6,7]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[6,7]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[3,6]},{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[3,9,10]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6,10]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,3,6]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[9,10]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,4,8]}],"complexes":[],"partners":["DTX3L","SR-BI","ANGPTL3","IGF2BP1","ZDHHC1"],"other_free_text":[]}},"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":127,"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":79,"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. Cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/12917105","citation_count":68,"is_preprint":false},{"pmid":"10978741","id":"PMC_10978741","title":"Persistence of botulinum neurotoxin A demonstrated by sequential administration of serotypes A and E in rat EDL muscle.","date":"2001","source":"Toxicon : official journal of the International Society on Toxinology","url":"https://pubmed.ncbi.nlm.nih.gov/10978741","citation_count":64,"is_preprint":false},{"pmid":"14984737","id":"PMC_14984737","title":"Association between single-nucleotide polymorphisms in the endothelial lipase (LIPG) gene and high-density lipoprotein cholesterol levels.","date":"2004","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/14984737","citation_count":59,"is_preprint":false},{"pmid":"20967384","id":"PMC_20967384","title":"Diabetes induces compositional, structural and functional alterations on rat skeletal soleus muscle revealed by FTIR spectroscopy: a comparative study with EDL muscle.","date":"2010","source":"The Analyst","url":"https://pubmed.ncbi.nlm.nih.gov/20967384","citation_count":59,"is_preprint":false},{"pmid":"18650267","id":"PMC_18650267","title":"A gene for speed: contractile properties of isolated whole EDL muscle from an alpha-actinin-3 knockout mouse.","date":"2008","source":"American journal of physiology. 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genetic variants in LIPG are associated with altered HDL cholesterol levels in humans, consistent with its role in HDL metabolism.\",\n      \"method\": \"Resequencing of the LIPG gene in an ethnically diverse population followed by association analysis with HDL cholesterol levels\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — genetic association study, no direct in vitro enzymatic characterization performed in this paper; functional inference from family membership\",\n      \"pmids\": [\"14984737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Lipg was identified as the quantitative trait locus (QTL) gene controlling plasma HDL levels on mouse chromosome 18, through quantitative complementation testing combined with haplotype analysis and expression studies across multiple mouse crosses.\",\n      \"method\": \"QTL analysis across multiple mouse crosses, haplotype analysis, gene expression analysis, and quantitative complementation testing\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (QTL mapping, haplotype analysis, complementation testing) in a single study, single lab\",\n      \"pmids\": [\"19436067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Both rare and common noncoding regulatory variants in the LIPG promoter and 5' UTR alter LIPG promoter activity (measured by luciferase reporter assay) and are associated with plasma endothelial lipase protein levels and HDL cholesterol; a common 5' UTR variant (rs34474737) in linkage disequilibrium with the coding SNP rs2000813 decreases LIPG promoter activity and accounts for the observed HDL-C association.\",\n      \"method\": \"Resequencing of LIPG promoter and 5' UTR, luciferase reporter assays, association analysis with plasma EL protein levels and HDL-C\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional luciferase assay plus genetic association, single lab, two orthogonal methods\",\n      \"pmids\": [\"22174694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LIPG expression in breast cancer cells is driven by FoxA1 or FoxA2 transcription factors, and LIPG enables import of extracellular lipid precursors that fuel intracellular lipid synthesis required for breast cancer cell proliferation; knockdown of LIPG or FoxA reduces proliferation and impairs synthesis of intracellular lipids.\",\n      \"method\": \"Knockdown of LIPG and FoxA in breast cancer cell lines with measurement of proliferation and intracellular lipid synthesis; lipidomic analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with defined proliferation and lipid synthesis phenotype, single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"27045898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LIPG possesses a lipase-dependent function supporting cancer cell proliferation and a lipase-independent function promoting invasiveness, stemness and epithelial-mesenchymal transition in TNBC; DTX3L (an E3-ubiquitin ligase) maintains LIPG protein levels by inhibiting proteasome-mediated degradation; LIPG participates in DTX3L-ISG15 interferon signaling (ISGylation), and this DTX3L-LIPG-ISG15 axis is essential for TNBC malignancy.\",\n      \"method\": \"In vivo tumorigenicity and metastasis assays, lipase-dead mutants, proteasome inhibitor experiments, Co-immunoprecipitation, siRNA knockdown of DTX3L and LIPG\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (in vivo assays, mutagenesis, Co-IP, KD), single lab\",\n      \"pmids\": [\"29350614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Severe oxidative stress leading to AMPK activation triggers LIPG upregulation in breast cancer cells, resulting in intracellular lipid droplet accumulation that supports cell survival under oxidative stress; neutralizing oxidative stress abolished LIPG upregulation and the associated lipid storage.\",\n      \"method\": \"Oxidative stress induction with AMPK activation measurement, LIPG expression analysis, lipid droplet quantification in breast cancer cell lines, neutralization of oxidative stress\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined mechanistic pathway (oxidative stress→AMPK→LIPG→lipid droplets) with multiple perturbations, single lab\",\n      \"pmids\": [\"30653260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIPG is a cell surface-associated lipase displaying phospholipase A1 activity toward phosphatidylcholine in HDL; in the hepatic microenvironment, leukemia cells upregulate endothelial lipase to stimulate tumor cell proliferation through polyunsaturated fatty acid (PUFA)-mediated pathways and to promote survival by stabilizing antiapoptotic proteins.\",\n      \"method\": \"Liver microenvironment co-culture models, LIPG expression analysis, PUFA pathway analysis, apoptotic protein stability assays in leukemia cells\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined mechanism linking LIPG to PUFA signaling and antiapoptotic protein stabilization, single lab, multiple readouts\",\n      \"pmids\": [\"33028621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Inhibition of LIPG phospholipase activity by XEN445 (a specific LIPG inhibitor) preferentially inhibits proliferation of LIPG-expressing TNBC cells but not LIPG-negative luminal breast cancer cells, inhibits cancer stem cell self-renewal in vitro, and suppresses TNBC tumor formation in vivo, but has no effect on invasiveness or CSC stemness, indicating the enzymatic function is responsible for proliferative but not invasive phenotypes.\",\n      \"method\": \"Cell-based LIPG enzymatic assay, XEN445 treatment of TNBC and luminal breast cancer cell lines, in vitro CSC self-renewal assay, in vivo tumor formation assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzymatic inhibition with specific pharmacological tool plus in vivo validation, single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"32488004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZDHHC1 downregulates LIPG expression via palmitoylation of IGF2BP1 at C337, which induces m6A-dependent reduction of LIPG mRNA stability; the ZDHHC1/IGF2BP1/LIPG signaling axis inhibits colorectal cancer cell growth and lipid storage.\",\n      \"method\": \"ZDHHC1 knockdown and overexpression in CRC cells, IGF2BP1 palmitoylation site mutagenesis, m6A modification analysis, LIPG mRNA stability assays, in vitro and in vivo proliferation and invasion assays\",\n      \"journal\": \"Cancer gene therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — palmitoylation site-specific mutagenesis plus m6A assays and functional phenotype, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"39069526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Endothelial lipase (EL, encoded by LIPG) promotes binding, uptake, and transcytosis of LDL and HDL across primary human aortic endothelial cells; EL's catalytic activity is essential for lipoprotein transport but not for surface association; EL and scavenger receptor BI (SR-BI) act sequentially to mediate LDL uptake but independently for HDL uptake; ANGPTL3 selectively inhibits EL-mediated transcytosis of LDL but not HDL.\",\n      \"method\": \"EL overexpression and knockdown in primary human aortic endothelial cells (HAEC), fluorescent lipoprotein transport assays, enzymatic inhibition, SR-BI co-perturbation, ex vivo bovine aorta LDL accumulation assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (overexpression, KD, enzymatic inhibition, ex vivo validation), single lab, preprint not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"EL (encoded by LIPG) overexpression almost fully rescues LDL uptake in LDLR-knockout HepG2 hepatocytes; this EL-mediated LDL uptake is completely blocked by heparinases and heparin, indicating dependence on heparan sulfate proteoglycans (HSPG); EL's enzymatic activity (inhibited by tetrahydrolipstatin) is required for HSPG-dependent LDL uptake.\",\n      \"method\": \"LIPG overexpression in control and LDLR-KO HepG2 cells, FACS-based fluorescent LDL uptake assay, heparin/heparinase treatment, tetrahydrolipstatin enzymatic inhibition\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO rescue system, pharmacological and enzymatic perturbations, multiple orthogonal methods, single lab, preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The rat Lipg gene was sequenced and chromosomally mapped to rat chromosome 18 in the vicinity of marker D18Mit11, a region syntenic with human and mouse chromosome 18.\",\n      \"method\": \"Gene sequencing using primers based on mouse mRNA sequence; rat-hamster radiation hybrid (RH) panel for chromosomal assignment\",\n      \"journal\": \"DNA sequence : the journal of DNA sequencing and mapping\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single mapping experiment, no functional characterization\",\n      \"pmids\": [\"11924532\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LIPG (endothelial lipase) is a cell surface-associated phospholipase A1 with low triglyceride lipase activity that remodels HDL phosphatidylcholine and, through its catalytic activity and heparan sulfate proteoglycan-dependent mechanisms, mediates transcytosis and uptake of LDL and HDL across endothelial cells; in cancer cells it imports extracellular lipid precursors to fuel intracellular lipid synthesis and proliferation, its expression is transcriptionally regulated by FoxA1/2 and post-transcriptionally by the ZDHHC1/IGF2BP1/m6A axis, its protein stability is maintained by the DTX3L E3 ubiquitin ligase through inhibition of proteasomal degradation, and it participates in DTX3L-ISG15 interferon signaling to promote tumor malignancy.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LIPG encodes endothelial lipase, a cell surface-associated member of the triglyceride lipase family that functions principally as a phospholipase A1 hydrolyzing phosphatidylcholine in HDL, and whose activity governs plasma HDL cholesterol levels in humans and mice [#1, #6]. Both rare and common noncoding regulatory variants in the LIPG promoter and 5' UTR alter promoter activity and track with circulating endothelial lipase protein and HDL-C [#2]. At the endothelial surface, the enzyme mediates binding, uptake, and transcytosis of both LDL and HDL across aortic endothelial cells; its catalytic activity is required for lipoprotein transport but not for surface association, it acts sequentially with SR-BI for LDL but independently for HDL, and ANGPTL3 selectively inhibits its LDL transcytosis [#9]. In hepatocytes its LDL uptake activity depends on heparan sulfate proteoglycans and on its enzymatic function, sufficient to rescue uptake in LDLR-knockout cells [#10]. Beyond lipoprotein metabolism, LIPG has a prominent role in cancer cell lipid acquisition: driven by FoxA1/FoxA2 transcription factors, it imports extracellular lipid precursors that fuel intracellular lipid synthesis and tumor cell proliferation [#3], and it is induced by oxidative-stress-triggered AMPK activation to drive lipid droplet accumulation supporting survival [#5]. In triple-negative breast cancer it possesses separable functions—a lipase-dependent activity supporting proliferation and a lipase-independent activity promoting invasiveness, stemness, and EMT—where its protein stability is maintained by the DTX3L E3 ubiquitin ligase via inhibition of proteasomal degradation and it participates in DTX3L-ISG15 interferon signaling [#4]; pharmacological inhibition of its phospholipase activity with XEN445 selectively blocks proliferative but not invasive phenotypes [#7]. Its expression is also post-transcriptionally repressed through a ZDHHC1/IGF2BP1 palmitoylation-dependent m6A axis that destabilizes LIPG mRNA [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established LIPG as a triglyceride-lipase-family enzyme with phospholipase activity whose human genetic variation links it to HDL cholesterol regulation.\",\n      \"evidence\": \"Resequencing of LIPG across an ethnically diverse population with HDL-C association analysis\",\n      \"pmids\": [\"14984737\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct in vitro enzymatic assay performed in this study\", \"Functional role inferred from family membership and association, not causation\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that Lipg is the causal QTL gene controlling plasma HDL levels, moving the gene-HDL link from association to genetic causality.\",\n      \"evidence\": \"QTL mapping, haplotype analysis, and quantitative complementation across multiple mouse crosses\",\n      \"pmids\": [\"19436067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which Lipg sets HDL levels not resolved at molecular level\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified the regulatory basis of LIPG-driven HDL variation by showing noncoding promoter/5' UTR variants alter promoter activity and protein levels.\",\n      \"evidence\": \"Resequencing, luciferase reporter assays, and association with plasma EL protein and HDL-C\",\n      \"pmids\": [\"22174694\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not address enzymatic mechanism on lipoproteins\", \"Causal variant effects shown in reporter context only\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed a cancer-specific role: FoxA-driven LIPG imports extracellular lipid precursors to fuel lipid synthesis and breast cancer proliferation.\",\n      \"evidence\": \"LIPG and FoxA knockdown in breast cancer lines with proliferation, lipid synthesis, and lipidomic readouts\",\n      \"pmids\": [\"27045898\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of precursor import not biochemically defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Separated LIPG into lipase-dependent (proliferation) and lipase-independent (invasion/stemness/EMT) functions and identified DTX3L as a stabilizer linking LIPG to ISG15 interferon signaling.\",\n      \"evidence\": \"In vivo tumorigenicity/metastasis assays, lipase-dead mutants, proteasome inhibition, Co-IP, and siRNA knockdown\",\n      \"pmids\": [\"29350614\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the lipase-independent function unresolved\", \"DTX3L-LIPG interaction shown by Co-IP without reciprocal structural validation\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected LIPG to stress adaptation by showing oxidative-stress-induced AMPK activation upregulates LIPG to drive protective lipid droplet accumulation.\",\n      \"evidence\": \"Oxidative stress induction with AMPK measurement, LIPG expression, lipid droplet quantification, and stress neutralization in breast cancer cells\",\n      \"pmids\": [\"30653260\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional link between AMPK and LIPG not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Confirmed LIPG as a cell-surface phospholipase A1 acting on HDL phosphatidylcholine and extended its tumor role to leukemia via PUFA signaling and antiapoptotic protein stabilization.\",\n      \"evidence\": \"Liver microenvironment co-culture, PUFA pathway analysis, and apoptotic protein stability assays\",\n      \"pmids\": [\"33028621\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PUFA-mediated signaling pathway not fully delineated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Pharmacologically dissected LIPG functions, showing its enzymatic activity drives proliferation and CSC self-renewal but not invasiveness.\",\n      \"evidence\": \"XEN445 enzymatic inhibition of TNBC vs luminal lines, in vitro CSC self-renewal, and in vivo tumor formation assays\",\n      \"pmids\": [\"32488004\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate consumed in proliferative phenotype not identified\", \"Lipase-independent invasion mechanism remains undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified post-transcriptional control of LIPG through a ZDHHC1/IGF2BP1 palmitoylation-m6A axis that destabilizes LIPG mRNA and suppresses colorectal cancer growth.\",\n      \"evidence\": \"ZDHHC1 perturbation, IGF2BP1 C337 palmitoylation-site mutagenesis, m6A and mRNA stability assays, in vitro/in vivo phenotypes\",\n      \"pmids\": [\"39069526\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality of this regulatory axis across tissues not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established LIPG as a transcytosis machine for both LDL and HDL across endothelium, with catalysis required for transport, distinct SR-BI coordination, and selective ANGPTL3 regulation.\",\n      \"evidence\": \"EL overexpression/knockdown in primary human aortic endothelial cells, fluorescent lipoprotein transport assays, enzymatic inhibition, SR-BI co-perturbation, ex vivo bovine aorta assay (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Mechanistic coupling between catalysis and transcytosis not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated that EL-mediated LDL uptake is heparan-sulfate-proteoglycan- and enzymatic-activity-dependent and can substitute for LDLR in hepatocytes.\",\n      \"evidence\": \"LIPG overexpression in LDLR-KO HepG2 cells, FACS LDL uptake, heparin/heparinase treatment, tetrahydrolipstatin inhibition (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Physiological contribution of HSPG-dependent uptake relative to LDLR in vivo not quantified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular basis of LIPG's lipase-independent functions and the structural mechanism coupling its phospholipase activity to lipoprotein uptake/transcytosis remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model linking catalysis to transcytosis\", \"Lipase-independent invasion/stemness mechanism uncharacterized\", \"Identity of imported lipid species fueling cancer proliferation not fully defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 6, 7]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [3, 6]},\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [3, 9, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 3, 6]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [9, 10]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 4, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"DTX3L\", \"SR-BI\", \"ANGPTL3\", \"IGF2BP1\", \"ZDHHC1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}